use anyhow::{Context, Result, anyhow};
use async_trait::async_trait;
use chrono::{DateTime, Local, Utc};
use crossterm::{
    event::{KeyEvent, MouseButton, MouseEvent, MouseEventKind},
    terminal::{disable_raw_mode, enable_raw_mode},
};
use owlen_core::Error as CoreError;
use owlen_core::consent::ConsentScope;
use owlen_core::facade::llm_client::LlmClient;
use owlen_core::mcp::remote_client::RemoteMcpClient;
use owlen_core::mcp::{McpToolDescriptor, McpToolResponse};
use owlen_core::provider::{
    AnnotatedModelInfo, ModelInfo as ProviderModelInfo, ProviderMetadata, ProviderStatus,
    ProviderType,
};
use owlen_core::{
    ProviderConfig,
    config::McpResourceConfig,
    model::DetailedModelInfo,
    oauth::{DeviceAuthorization, DevicePollState},
    session::{ControllerEvent, SessionController, SessionOutcome, ToolConsentResolution},
    storage::SessionMeta,
    theme::Theme,
    types::{ChatParameters, ChatResponse, Conversation, ModelInfo, Role, TokenUsage},
    ui::{AppState, AutoScroll, FocusedPanel, InputMode, RoleLabelDisplay},
    usage::{UsageBand, UsageSnapshot, UsageWindow, WindowMetrics},
};
use owlen_markdown::from_str;
use pathdiff::diff_paths;
use ratatui::{
    layout::Rect,
    style::{Color, Modifier, Style},
    text::{Line, Span},
};
use textwrap::{Options, WordSeparator, wrap};
use tokio::{
    sync::mpsc,
    task::{self, JoinHandle},
};
use tui_textarea::{CursorMove, Input, TextArea};
use unicode_segmentation::UnicodeSegmentation;
use unicode_width::UnicodeWidthStr;
use uuid::Uuid;

use crate::app::{
    MessageState, UiRuntime,
    mvu::{self, AppEffect, AppEvent, AppModel, ComposerEvent, SubmissionOutcome},
};
use crate::commands::{AppCommand, CommandRegistry};
use crate::config;
use crate::events::Event;
use crate::model_info_panel::ModelInfoPanel;
use crate::slash::{self, McpSlashCommand, SlashCommand};
use crate::state::{
    CodeWorkspace, CommandPalette, DebugLogEntry, DebugLogState, FileFilterMode, FileIconResolver,
    FileNode, FileTreeState, Keymap, KeymapProfile, ModelPaletteEntry, PaletteSuggestion,
    PaneDirection, PaneRestoreRequest, RepoSearchMessage, RepoSearchState, SplitAxis,
    SymbolSearchMessage, SymbolSearchState, WorkspaceSnapshot, install_global_logger,
    spawn_repo_search_task, spawn_symbol_search_task,
};
use crate::toast::{Toast, ToastLevel, ToastManager};
use crate::ui::{format_token_short, format_tool_output};
use crate::widgets::model_picker::FilterMode;
use crate::{commands, highlight};
use owlen_core::config::{
    LEGACY_OLLAMA_CLOUD_API_KEY_ENV, LEGACY_OWLEN_OLLAMA_CLOUD_API_KEY_ENV, OLLAMA_API_KEY_ENV,
    OLLAMA_CLOUD_BASE_URL, OLLAMA_CLOUD_ENDPOINT_KEY, OLLAMA_MODE_KEY,
};
use owlen_core::credentials::{ApiCredentials, OLLAMA_CLOUD_CREDENTIAL_ID};
// Agent executor moved to separate binary `owlen-agent`. The TUI no longer directly
// imports `AgentExecutor` to avoid a circular dependency on `owlen-cli`.
use std::collections::hash_map::DefaultHasher;
use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet, VecDeque};
use std::env;
use std::fs;
use std::fs::OpenOptions;
use std::hash::{Hash, Hasher};
use std::path::{Component, Path, PathBuf};
use std::process::Command;
use std::sync::Arc;
use std::time::{Duration, Instant, SystemTime};

use dirs::{config_dir, data_local_dir};
use log::Level;
use serde_json::{Value, json};

const ONBOARDING_STATUS_LINE: &str =
    "Welcome to Owlen! Press F1 for help or type :tutorial for keybinding tips.";
const ONBOARDING_SYSTEM_STATUS: &str =
    "Normal ▸ h/j/k/l • Insert ▸ i,a • Visual ▸ v • Command ▸ : • Help ▸ F1/?";
const TUTORIAL_STATUS: &str = "Tutorial loaded. Review quick tips in the footer.";
const TUTORIAL_SYSTEM_STATUS: &str =
    "Normal ▸ h/j/k/l • Insert ▸ i,a • Visual ▸ v • Command ▸ : • Help ▸ F1/? • Send ▸ Enter";

const DEFAULT_CLOUD_ENDPOINT: &str = OLLAMA_CLOUD_BASE_URL;

const FOCUS_CHORD_TIMEOUT: Duration = Duration::from_millis(1200);
const RESIZE_DOUBLE_TAP_WINDOW: Duration = Duration::from_millis(450);
const RESIZE_STEP: f32 = 0.05;
const RESIZE_SNAP_VALUES: [f32; 3] = [0.5, 0.75, 0.25];
const DOUBLE_CTRL_C_WINDOW: Duration = Duration::from_millis(1500);
pub(crate) const MIN_MESSAGE_CARD_WIDTH: usize = 14;
const MOUSE_SCROLL_STEP: isize = 3;
const DEFAULT_CONTEXT_WINDOW_TOKENS: u32 = 8_192;

#[derive(Clone, Copy, Debug, Default)]
pub struct ContextUsage {
    pub prompt_tokens: u32,
    pub completion_tokens: u32,
    pub context_window: u32,
}

#[derive(Clone, Copy, Debug)]
pub(crate) struct LayoutSnapshot {
    pub(crate) frame: Rect,
    pub(crate) content: Rect,
    pub(crate) header_panel: Option<Rect>,
    pub(crate) file_panel: Option<Rect>,
    pub(crate) chat_panel: Option<Rect>,
    pub(crate) thinking_panel: Option<Rect>,
    pub(crate) actions_panel: Option<Rect>,
    pub(crate) input_panel: Option<Rect>,
    pub(crate) system_panel: Option<Rect>,
    pub(crate) status_panel: Option<Rect>,
    pub(crate) code_panel: Option<Rect>,
    pub(crate) model_info_panel: Option<Rect>,
}

impl LayoutSnapshot {
    pub(crate) fn new(frame: Rect, content: Rect) -> Self {
        Self {
            frame,
            content,
            header_panel: None,
            file_panel: None,
            chat_panel: None,
            thinking_panel: None,
            actions_panel: None,
            input_panel: None,
            system_panel: None,
            status_panel: None,
            code_panel: None,
            model_info_panel: None,
        }
    }

    fn contains(rect: Rect, column: u16, row: u16) -> bool {
        let x_end = rect.x.saturating_add(rect.width);
        let y_end = rect.y.saturating_add(rect.height);
        column >= rect.x && column < x_end && row >= rect.y && row < y_end
    }

    fn region_at(&self, column: u16, row: u16) -> Option<UiRegion> {
        if let Some(rect) = self.model_info_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::ModelInfo);
            }
        }
        if let Some(rect) = self.header_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Header);
            }
        }
        if let Some(rect) = self.code_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Code);
            }
        }
        if let Some(rect) = self.file_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::FileTree);
            }
        }
        if let Some(rect) = self.input_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Input);
            }
        }
        if let Some(rect) = self.system_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::System);
            }
        }
        if let Some(rect) = self.status_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Status);
            }
        }
        if let Some(rect) = self.actions_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Actions);
            }
        }
        if let Some(rect) = self.thinking_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Thinking);
            }
        }
        if let Some(rect) = self.chat_panel {
            if Self::contains(rect, column, row) {
                return Some(UiRegion::Chat);
            }
        }
        if Self::contains(self.content, column, row) {
            Some(UiRegion::Content)
        } else if Self::contains(self.frame, column, row) {
            Some(UiRegion::Frame)
        } else {
            None
        }
    }
}

impl Default for LayoutSnapshot {
    fn default() -> Self {
        Self::new(Rect::new(0, 0, 0, 0), Rect::new(0, 0, 0, 0))
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum UiRegion {
    Header,
    Frame,
    Content,
    FileTree,
    Chat,
    Thinking,
    Actions,
    Input,
    System,
    Status,
    Code,
    ModelInfo,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum SlashOutcome {
    NotCommand,
    Consumed,
    Error,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum SaveStatus {
    Saved,
    NoChanges,
    Failed,
}

#[derive(Clone, Debug)]
pub(crate) struct ModelSelectorItem {
    kind: ModelSelectorItemKind,
}

#[derive(Clone, Debug)]
pub(crate) struct HighlightMask {
    bits: Vec<bool>,
}

impl HighlightMask {
    fn new(bits: Vec<bool>) -> Self {
        Self { bits }
    }

    pub(crate) fn is_marked(&self) -> bool {
        self.bits.iter().any(|b| *b)
    }

    pub(crate) fn bits(&self) -> &[bool] {
        &self.bits
    }

    pub(crate) fn truncated(&self, len: usize) -> Self {
        let len = len.min(self.bits.len());
        Self::new(self.bits[..len].to_vec())
    }
}

#[derive(Clone, Debug, Default)]
pub(crate) struct ModelSearchInfo {
    pub(crate) score: (usize, usize),
    pub(crate) name: Option<HighlightMask>,
    pub(crate) id: Option<HighlightMask>,
    pub(crate) provider: Option<HighlightMask>,
    pub(crate) description: Option<HighlightMask>,
}

#[derive(Clone, Debug)]
pub(crate) enum ModelSelectorItemKind {
    Header {
        provider: String,
        expanded: bool,
        status: ProviderStatus,
        provider_type: ProviderType,
    },
    Scope {
        provider: String,
        label: String,
        scope: ModelScope,
        status: ModelAvailabilityState,
    },
    Model {
        provider: String,
        model_index: usize,
    },
    Empty {
        provider: String,
        message: Option<String>,
        status: Option<ModelAvailabilityState>,
    },
}

impl ModelSelectorItem {
    fn header(
        provider: impl Into<String>,
        expanded: bool,
        status: ProviderStatus,
        provider_type: ProviderType,
    ) -> Self {
        Self {
            kind: ModelSelectorItemKind::Header {
                provider: provider.into(),
                expanded,
                status,
                provider_type,
            },
        }
    }

    fn scope(
        provider: impl Into<String>,
        label: impl Into<String>,
        scope: ModelScope,
        status: ModelAvailabilityState,
    ) -> Self {
        Self {
            kind: ModelSelectorItemKind::Scope {
                provider: provider.into(),
                label: label.into(),
                scope,
                status,
            },
        }
    }

    fn model(provider: impl Into<String>, model_index: usize) -> Self {
        Self {
            kind: ModelSelectorItemKind::Model {
                provider: provider.into(),
                model_index,
            },
        }
    }

    fn empty(
        provider: impl Into<String>,
        message: Option<String>,
        status: Option<ModelAvailabilityState>,
    ) -> Self {
        Self {
            kind: ModelSelectorItemKind::Empty {
                provider: provider.into(),
                message,
                status,
            },
        }
    }

    fn is_model(&self) -> bool {
        matches!(self.kind, ModelSelectorItemKind::Model { .. })
    }

    fn model_index(&self) -> Option<usize> {
        match &self.kind {
            ModelSelectorItemKind::Model { model_index, .. } => Some(*model_index),
            _ => None,
        }
    }

    fn provider_if_header(&self) -> Option<&str> {
        match &self.kind {
            ModelSelectorItemKind::Header { provider, .. }
            | ModelSelectorItemKind::Scope { provider, .. } => Some(provider),
            _ => None,
        }
    }

    pub(crate) fn kind(&self) -> &ModelSelectorItemKind {
        &self.kind
    }
}

fn collect_lower_graphemes(text: &str) -> (Vec<&str>, Vec<String>) {
    let graphemes: Vec<&str> = UnicodeSegmentation::graphemes(text, true).collect();
    let lower: Vec<String> = graphemes.iter().map(|g| g.to_lowercase()).collect();
    (graphemes, lower)
}

fn subsequence_highlight(candidate: &[String], query: &[String]) -> Option<Vec<bool>> {
    if query.is_empty() {
        return None;
    }
    let mut mask = vec![false; candidate.len()];
    let mut q_idx = 0usize;
    for (idx, g) in candidate.iter().enumerate() {
        if q_idx < query.len() && g == &query[q_idx] {
            mask[idx] = true;
            q_idx += 1;
        }
    }
    if q_idx == query.len() {
        Some(mask)
    } else {
        None
    }
}

fn search_candidate(candidate: &str, query: &str) -> Option<((usize, usize), HighlightMask)> {
    let candidate = candidate.trim();
    let query = query.trim();
    if candidate.is_empty() || query.is_empty() {
        return None;
    }

    let (original_graphemes, lower_graphemes) = collect_lower_graphemes(candidate);
    let candidate_lower = lower_graphemes.join("");
    let query_lower = query.to_lowercase();
    let query_graphemes: Vec<String> = UnicodeSegmentation::graphemes(query_lower.as_str(), true)
        .map(|g| g.to_string())
        .collect();
    let query_len = query_graphemes.len();

    let mut mask = vec![false; original_graphemes.len()];

    if candidate_lower == query_lower {
        mask.fill(true);
        return Some(((0, candidate.len()), HighlightMask::new(mask)));
    }

    if candidate_lower.starts_with(&query_lower) {
        for idx in 0..query_len.min(mask.len()) {
            mask[idx] = true;
        }
        return Some(((1, 0), HighlightMask::new(mask)));
    }

    if let Some(start_byte) = candidate_lower.find(&query_lower) {
        let mut collected_bytes = 0usize;
        let mut start_index = 0usize;
        for (idx, grapheme) in lower_graphemes.iter().enumerate() {
            if collected_bytes == start_byte {
                start_index = idx;
                break;
            }
            collected_bytes += grapheme.len();
        }
        for idx in start_index..(start_index + query_len).min(mask.len()) {
            mask[idx] = true;
        }
        return Some(((2, start_byte), HighlightMask::new(mask)));
    }

    if let Some(subsequence_mask) = subsequence_highlight(&lower_graphemes, &query_graphemes) {
        if subsequence_mask.iter().any(|b| *b) {
            return Some(((3, candidate.len()), HighlightMask::new(subsequence_mask)));
        }
    }

    None
}

#[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub(crate) enum ModelScope {
    Local,
    Cloud,
    Other(String),
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub(crate) enum ModelAvailabilityState {
    Unknown,
    Available,
    Unavailable,
}

impl Default for ModelAvailabilityState {
    fn default() -> Self {
        Self::Unknown
    }
}

#[derive(Clone, Debug, Default)]
pub(crate) struct ScopeStatusEntry {
    pub state: ModelAvailabilityState,
    pub message: Option<String>,
    pub last_checked_secs: Option<u64>,
    pub last_success_secs: Option<u64>,
    pub is_stale: bool,
}

pub(crate) type ProviderScopeStatus = BTreeMap<ModelScope, ScopeStatusEntry>;

/// Messages emitted by asynchronous streaming tasks
#[derive(Debug)]
pub enum SessionEvent {
    StreamChunk {
        message_id: Uuid,
        response: ChatResponse,
    },
    StreamError {
        message_id: Option<Uuid>,
        message: String,
    },
    ToolExecutionNeeded {
        message_id: Uuid,
        tool_calls: Vec<owlen_core::types::ToolCall>,
    },
    /// Agent iteration update (shows THOUGHT/ACTION/OBSERVATION)
    AgentUpdate { content: String },
    /// Agent execution completed with final answer
    AgentCompleted { answer: String },
    /// Agent execution failed
    AgentFailed { error: String },
    /// Poll the OAuth device authorization flow for the given server
    OAuthPoll {
        server: String,
        authorization: DeviceAuthorization,
    },
}

pub const HELP_TAB_COUNT: usize = 7;

pub struct ChatApp {
    controller: SessionController,
    pub mode: InputMode,
    mode_flash_until: Option<Instant>,
    pub status: String,
    pub error: Option<String>,
    models: Vec<ModelInfo>,                    // All models fetched
    annotated_models: Vec<AnnotatedModelInfo>, // Models annotated with provider metadata
    provider_scope_status: HashMap<String, ProviderScopeStatus>,
    pub available_providers: Vec<String>, // Unique providers from models
    pub selected_provider: String,        // The currently selected provider
    pub selected_provider_index: usize,   // Index into the available_providers list
    pub selected_model_item: Option<usize>, // Index into the flattened model selector list
    model_selector_items: Vec<ModelSelectorItem>, // Flattened provider/model list for selector
    model_filter_mode: FilterMode,        // Active filter applied to the model list
    model_filter_memory: FilterMode,      // Last user-selected filter mode
    model_search_query: String,           // Active fuzzy search query for the picker
    model_search_hits: HashMap<usize, ModelSearchInfo>, // Cached search metadata per model index
    provider_search_hits: HashMap<String, HighlightMask>, // Cached search highlight per provider
    visible_model_count: usize,           // Number of visible models in current selector view
    model_info_panel: ModelInfoPanel,     // Dedicated model information viewer
    model_details_cache: HashMap<String, DetailedModelInfo>, // Cached detailed metadata per model
    show_model_info: bool,                // Whether the model info panel is visible
    model_info_viewport_height: usize,    // Cached viewport height for the info panel
    expanded_provider: Option<String>,    // Which provider group is currently expanded
    current_provider: String,             // Provider backing the active session
    message_line_cache: HashMap<Uuid, MessageCacheEntry>, // Cached rendered lines per message
    show_cursor_outside_insert: bool,     // Configurable cursor visibility flag
    syntax_highlighting: bool,            // Whether syntax highlighting is enabled
    render_markdown: bool,                // Whether markdown rendering is enabled
    show_message_timestamps: bool,        // Whether to render timestamps in chat headers
    auto_scroll: AutoScroll,              // Auto-scroll state for message rendering
    thinking_scroll: AutoScroll,          // Auto-scroll state for thinking panel
    viewport_height: usize,               // Track the height of the messages viewport
    thinking_viewport_height: usize,      // Track the height of the thinking viewport
    content_width: usize,                 // Track the content width for line wrapping calculations
    session_tx: mpsc::UnboundedSender<SessionEvent>,
    streaming: HashSet<Uuid>,
    stream_tasks: HashMap<Uuid, JoinHandle<()>>,
    textarea: TextArea<'static>, // Advanced text input widget
    mvu_model: AppModel,
    keymap: Keymap,
    current_keymap_profile: KeymapProfile,
    controller_event_rx: mpsc::UnboundedReceiver<ControllerEvent>,
    pending_llm_request: bool, // Flag to indicate LLM request needs to be processed
    pending_tool_execution: Option<(Uuid, Vec<owlen_core::types::ToolCall>)>, // Pending tool execution (message_id, tool_calls)
    loading_animation_frame: usize, // Frame counter for loading animation
    is_loading: bool,               // Whether we're currently loading a response
    current_thinking: Option<String>, // Current thinking content from last assistant message
    // Holds the latest formatted Agentic ReAct actions (thought/action/observation)
    agent_actions: Option<String>,
    pending_key: Option<char>, // For multi-key sequences like gg, dd
    clipboard: String,         // Vim-style clipboard for yank/paste
    pending_file_action: Option<FileActionPrompt>, // Active file action prompt
    command_palette: CommandPalette, // Command mode state (buffer + suggestions)
    resource_catalog: Vec<McpResourceConfig>, // Configured MCP resources for autocompletion
    pending_resource_refs: Vec<String>, // Resource references to resolve before send
    oauth_flows: HashMap<String, DeviceAuthorization>, // Active OAuth device flows by server
    repo_search: RepoSearchState, // Repository search overlay state
    repo_search_task: Option<JoinHandle<()>>,
    repo_search_rx: Option<mpsc::UnboundedReceiver<RepoSearchMessage>>,
    repo_search_file_map: HashMap<PathBuf, usize>,
    symbol_search: SymbolSearchState, // Symbol search overlay state
    symbol_search_task: Option<JoinHandle<()>>,
    symbol_search_rx: Option<mpsc::UnboundedReceiver<SymbolSearchMessage>>,
    visual_start: Option<(usize, usize)>, // Visual mode selection start (row, col) for Input panel
    visual_end: Option<(usize, usize)>, // Visual mode selection end (row, col) for scrollable panels
    focused_panel: FocusedPanel,        // Currently focused panel for scrolling
    chat_cursor: (usize, usize),        // Cursor position in Chat panel (row, col)
    chat_line_offset: usize,            // Number of leading lines trimmed for scrollback
    thinking_cursor: (usize, usize),    // Cursor position in Thinking panel (row, col)
    code_workspace: CodeWorkspace,      // Code views with tabs/splits
    pending_focus_chord: Option<Instant>, // Tracks Ctrl+K focus chord timeout
    last_resize_tap: Option<(PaneDirection, Instant)>, // For Alt+arrow double-tap detection
    resize_snap_index: usize,           // Cycles through 25/50/75 snaps
    last_snap_direction: Option<PaneDirection>,
    last_ctrl_c: Option<Instant>, // Track timing for double Ctrl+C quit
    file_tree: FileTreeState,     // Workspace file tree state
    file_icons: FileIconResolver, // Icon resolver with Nerd/ASCII fallback
    file_panel_collapsed: bool,   // Whether the file panel is collapsed
    file_panel_width: u16,        // Cached file panel width
    saved_sessions: Vec<SessionMeta>, // Cached list of saved sessions
    selected_session_index: usize, // Index of selected session in browser
    help_tab_index: usize,        // Currently selected help tab (0-(HELP_TAB_COUNT-1))
    theme: Theme,                 // Current theme
    available_themes: Vec<String>, // Cached list of theme names
    selected_theme_index: usize,  // Index of selected theme in browser
    pending_consent: Option<ConsentDialogState>, // Pending consent request
    queued_consents: VecDeque<ConsentDialogState>, // Backlog of consent requests
    system_status: String,        // System/status messages (tool execution, status, etc)
    toasts: ToastManager,
    debug_log: DebugLogState,
    usage_snapshot: Option<UsageSnapshot>,
    usage_thresholds: HashMap<(String, UsageWindow), UsageBand>,
    context_usage: Option<ContextUsage>,
    last_layout: LayoutSnapshot,
    /// Simple execution budget: maximum number of tool calls allowed per session.
    _execution_budget: usize,
    /// Agent mode enabled
    agent_mode: bool,
    /// Agent running flag
    agent_running: bool,
    /// Operating mode (Chat or Code)
    operating_mode: owlen_core::mode::Mode,
    /// Flag indicating new messages arrived while scrolled away from tail
    new_message_alert: bool,
}

#[derive(Clone, Debug)]
pub struct ConsentDialogState {
    pub request_id: Uuid,
    pub tool_name: String,
    pub data_types: Vec<String>,
    pub endpoints: Vec<String>,
    pub message_id: Uuid,
    pub tool_calls: Vec<owlen_core::types::ToolCall>,
}

#[derive(Clone)]
struct MessageCacheEntry {
    theme_name: String,
    wrap_width: usize,
    role_label_mode: RoleLabelDisplay,
    syntax_highlighting: bool,
    render_markdown: bool,
    show_timestamps: bool,
    content_hash: u64,
    lines: Vec<Line<'static>>,
    metrics: MessageLayoutMetrics,
}

#[derive(Clone, Debug, Default)]
struct MessageLayoutMetrics {
    line_count: usize,
    body_width: usize,
    card_width: usize,
}

pub(crate) struct MessageRenderContext<'a> {
    formatter: &'a mut owlen_core::formatting::MessageFormatter,
    role_label_mode: RoleLabelDisplay,
    body_width: usize,
    card_width: usize,
    is_streaming: bool,
    loading_indicator: &'a str,
    theme: &'a Theme,
    syntax_highlighting: bool,
    render_markdown: bool,
}

impl<'a> MessageRenderContext<'a> {
    #[allow(clippy::too_many_arguments)]
    pub(crate) fn new(
        formatter: &'a mut owlen_core::formatting::MessageFormatter,
        role_label_mode: RoleLabelDisplay,
        body_width: usize,
        card_width: usize,
        is_streaming: bool,
        loading_indicator: &'a str,
        theme: &'a Theme,
        syntax_highlighting: bool,
        render_markdown: bool,
    ) -> Self {
        Self {
            formatter,
            role_label_mode,
            body_width,
            card_width,
            is_streaming,
            loading_indicator,
            theme,
            syntax_highlighting,
            render_markdown,
        }
    }
}

#[derive(Debug, Clone)]
enum MessageSegment {
    Text {
        lines: Vec<String>,
    },
    CodeBlock {
        language: Option<String>,
        lines: Vec<String>,
    },
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
enum FileOpenDisposition {
    Primary,
    SplitHorizontal,
    SplitVertical,
    Tab,
}

#[derive(Debug, Clone)]
struct FileActionPrompt {
    kind: FileActionKind,
    buffer: String,
}

#[derive(Debug, Clone)]
enum FileActionKind {
    CreateFile { base: PathBuf },
    CreateFolder { base: PathBuf },
    Rename { original: PathBuf },
    Move { original: PathBuf },
    Delete { target: PathBuf, confirm: String },
}

impl FileActionPrompt {
    fn new(kind: FileActionKind, initial: impl Into<String>) -> Self {
        Self {
            kind,
            buffer: initial.into(),
        }
    }

    fn push_char(&mut self, ch: char) {
        self.buffer.push(ch);
    }

    fn pop_char(&mut self) {
        self.buffer.pop();
    }

    fn set_buffer(&mut self, buffer: impl Into<String>) {
        self.buffer = buffer.into();
    }

    fn is_destructive(&self) -> bool {
        matches!(self.kind, FileActionKind::Delete { .. })
    }
}

impl ChatApp {
    pub async fn new(
        controller: SessionController,
        controller_event_rx: mpsc::UnboundedReceiver<ControllerEvent>,
    ) -> Result<(Self, mpsc::UnboundedReceiver<SessionEvent>)> {
        let (session_tx, session_rx) = mpsc::unbounded_channel();
        let mut textarea = TextArea::default();
        configure_textarea_defaults(&mut textarea);

        // Load theme and provider based on config before moving `controller`.
        let config_guard = controller.config_async().await;
        let theme_name = config_guard.ui.theme.clone();
        let current_provider = Self::canonical_provider_id(&config_guard.general.default_provider);
        let show_onboarding = config_guard.ui.show_onboarding;
        let show_cursor_outside_insert = config_guard.ui.show_cursor_outside_insert;
        let syntax_highlighting = config_guard.ui.syntax_highlighting;
        let render_markdown = config_guard.ui.render_markdown;
        let show_timestamps = config_guard.ui.show_timestamps;
        let icon_mode = config_guard.ui.icon_mode;
        let keymap_path = config_guard.ui.keymap_path.clone();
        let keymap_profile = config_guard.ui.keymap_profile.clone();
        drop(config_guard);
        let keymap = {
            let registry = CommandRegistry::default();
            Keymap::load(keymap_path.as_deref(), keymap_profile.as_deref(), &registry)
        };
        let current_keymap_profile = keymap.profile();
        let theme = owlen_core::theme::get_theme(&theme_name).unwrap_or_else(|| {
            eprintln!("Warning: Theme '{}' not found, using default", theme_name);
            Theme::default()
        });

        let workspace_root = std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."));
        let file_tree = FileTreeState::new(workspace_root);
        let file_icons = FileIconResolver::from_mode(icon_mode);

        install_global_logger();

        let mut app = Self {
            controller,
            mode: InputMode::Normal,
            mode_flash_until: None,
            status: if show_onboarding {
                ONBOARDING_STATUS_LINE.to_string()
            } else {
                "Normal mode • Press F1 for help".to_string()
            },
            error: None,
            models: Vec::new(),
            annotated_models: Vec::new(),
            provider_scope_status: HashMap::new(),
            available_providers: Vec::new(),
            selected_provider: current_provider.clone(),
            selected_provider_index: 0,
            selected_model_item: None,
            model_selector_items: Vec::new(),
            model_filter_mode: FilterMode::All,
            model_filter_memory: FilterMode::All,
            model_search_query: String::new(),
            model_search_hits: HashMap::new(),
            provider_search_hits: HashMap::new(),
            visible_model_count: 0,
            model_info_panel: ModelInfoPanel::new(),
            model_details_cache: HashMap::new(),
            show_model_info: false,
            model_info_viewport_height: 0,
            expanded_provider: None,
            current_provider,
            message_line_cache: HashMap::new(),
            auto_scroll: AutoScroll::default(),
            thinking_scroll: AutoScroll::default(),
            viewport_height: 10, // Default viewport height, will be updated during rendering
            thinking_viewport_height: 4, // Default thinking viewport height
            content_width: 80,   // Default content width, will be updated during rendering
            session_tx,
            streaming: std::collections::HashSet::new(),
            stream_tasks: HashMap::new(),
            textarea,
            mvu_model: AppModel::default(),
            keymap,
            current_keymap_profile,
            controller_event_rx,
            pending_llm_request: false,
            pending_tool_execution: None,
            loading_animation_frame: 0,
            is_loading: false,
            current_thinking: None,
            agent_actions: None,
            pending_key: None,
            clipboard: String::new(),
            pending_file_action: None,
            command_palette: CommandPalette::new(),
            resource_catalog: Vec::new(),
            pending_resource_refs: Vec::new(),
            oauth_flows: HashMap::new(),
            repo_search: RepoSearchState::new(),
            repo_search_task: None,
            repo_search_rx: None,
            repo_search_file_map: HashMap::new(),
            symbol_search: SymbolSearchState::new(),
            symbol_search_task: None,
            symbol_search_rx: None,
            visual_start: None,
            visual_end: None,
            focused_panel: FocusedPanel::Input,
            chat_cursor: (0, 0),
            chat_line_offset: 0,
            thinking_cursor: (0, 0),
            code_workspace: CodeWorkspace::new(),
            pending_focus_chord: None,
            last_resize_tap: None,
            resize_snap_index: 0,
            last_snap_direction: None,
            last_ctrl_c: None,
            file_tree,
            file_icons,
            file_panel_collapsed: true,
            file_panel_width: 32,
            saved_sessions: Vec::new(),
            selected_session_index: 0,
            help_tab_index: 0,
            theme,
            available_themes: Vec::new(),
            selected_theme_index: 0,
            pending_consent: None,
            queued_consents: VecDeque::new(),
            system_status: if show_onboarding {
                ONBOARDING_SYSTEM_STATUS.to_string()
            } else {
                String::new()
            },
            toasts: ToastManager::new(),
            debug_log: DebugLogState::new(),
            usage_snapshot: None,
            usage_thresholds: HashMap::new(),
            context_usage: None,
            last_layout: LayoutSnapshot::default(),
            _execution_budget: 50,
            agent_mode: false,
            agent_running: false,
            operating_mode: owlen_core::mode::Mode::default(),
            new_message_alert: false,
            show_cursor_outside_insert,
            syntax_highlighting,
            render_markdown,
            show_message_timestamps: show_timestamps,
        };

        app.mvu_model.composer.mode = InputMode::Normal;
        app.mvu_model.composer.draft = app.controller.input_buffer().text().to_string();

        app.append_system_status(&format!(
            "Icons: {} ({})",
            app.file_icons.status_label(),
            app.file_icons.detection_label()
        ));

        app.update_command_palette_catalog();
        app.refresh_resource_catalog().await?;
        app.refresh_mcp_slash_commands().await?;

        if let Err(err) = app.restore_workspace_layout().await {
            eprintln!("Warning: failed to restore workspace layout: {err}");
        }

        if show_onboarding {
            let mut cfg = app.controller.config_mut();
            if cfg.ui.show_onboarding {
                cfg.ui.show_onboarding = false;
                if let Err(err) = config::save_config(&cfg) {
                    eprintln!("Warning: Failed to persist onboarding preference: {err}");
                }
            }
        }

        app.refresh_usage_summary().await?;

        Ok((app, session_rx))
    }

    /// Check if consent dialog is currently shown
    pub fn has_pending_consent(&self) -> bool {
        self.pending_consent.is_some()
    }

    /// Get the current consent dialog state
    pub fn consent_dialog(&self) -> Option<&ConsentDialogState> {
        self.pending_consent.as_ref()
    }

    fn enqueue_consent_request(&mut self, consent: ConsentDialogState) {
        if self.pending_consent.is_none() {
            self.pending_consent = Some(consent);
        } else {
            self.queued_consents.push_back(consent);
        }
    }

    fn advance_consent_queue(&mut self) {
        if self.pending_consent.is_some() {
            return;
        }
        if let Some(next) = self.queued_consents.pop_front() {
            self.pending_consent = Some(next);
        }
    }

    fn handle_controller_event(&mut self, event: ControllerEvent) -> Result<()> {
        match event {
            ControllerEvent::ToolRequested {
                request_id,
                message_id,
                tool_name,
                data_types,
                endpoints,
                tool_calls,
            } => {
                self.enqueue_consent_request(ConsentDialogState {
                    request_id,
                    message_id,
                    tool_name,
                    data_types,
                    endpoints,
                    tool_calls,
                });
            }
        }
        Ok(())
    }

    fn apply_tool_consent_resolution(&mut self, resolution: ToolConsentResolution) -> Result<()> {
        let ToolConsentResolution {
            message_id,
            tool_name,
            scope,
            tool_calls,
            ..
        } = resolution;

        match scope {
            ConsentScope::Denied => {
                self.pending_tool_execution = None;
                self.status = format!("✗ Consent denied for {}", tool_name);
                self.set_system_status(format!("✗ Consent denied: {}", tool_name));
                self.error = Some(format!("Tool {} was blocked by user", tool_name));

                self.controller
                    .conversation_mut()
                    .push_assistant_message(format!(
                        "I could not execute `{tool_name}` because consent was denied. \
                         Replying without running the tool."
                    ));
                self.notify_new_activity();
            }
            ConsentScope::Once | ConsentScope::Session | ConsentScope::Permanent => {
                let scope_label = match scope {
                    ConsentScope::Once => "once",
                    ConsentScope::Session => "session",
                    ConsentScope::Permanent => "permanent",
                    ConsentScope::Denied => unreachable!("handled above"),
                };
                self.status = format!("✓ Consent granted ({scope_label}) for {}", tool_name);
                self.set_system_status(format!("✓ Consent granted ({scope_label}): {}", tool_name));
                self.error = None;
                self.pending_tool_execution = Some((message_id, tool_calls));
            }
        }

        self.pending_consent = None;
        self.advance_consent_queue();
        Ok(())
    }

    pub fn status_message(&self) -> &str {
        &self.status
    }

    pub fn error_message(&self) -> Option<&String> {
        self.error.as_ref()
    }

    pub fn mode(&self) -> InputMode {
        self.mode
    }

    pub fn conversation(&self) -> &Conversation {
        self.controller.conversation()
    }

    pub fn selected_model(&self) -> &str {
        self.controller.selected_model()
    }

    pub fn current_provider(&self) -> &str {
        &self.current_provider
    }

    pub fn usage_snapshot(&self) -> Option<&UsageSnapshot> {
        self.usage_snapshot.as_ref()
    }

    pub fn context_usage_with_fallback(&self) -> Option<ContextUsage> {
        if let Some(usage) = self.context_usage {
            Some(usage)
        } else {
            self.active_context_window().map(|window| ContextUsage {
                prompt_tokens: 0,
                completion_tokens: 0,
                context_window: window,
            })
        }
    }

    fn update_context_usage(&mut self, usage: &TokenUsage) {
        let context_window = self
            .active_context_window()
            .unwrap_or(DEFAULT_CONTEXT_WINDOW_TOKENS);
        self.context_usage = Some(ContextUsage {
            prompt_tokens: usage.prompt_tokens,
            completion_tokens: usage.completion_tokens,
            context_window,
        });
    }

    fn active_context_window(&self) -> Option<u32> {
        let current_model = self.controller.selected_model();

        self.models.iter().find_map(|model| {
            if model.id == current_model || model.name == current_model {
                model.context_window
            } else {
                None
            }
        })
    }

    pub fn should_show_code_view(&self) -> bool {
        if !matches!(self.operating_mode, owlen_core::mode::Mode::Code) {
            return false;
        }
        if let Some(pane) = self.code_workspace.active_pane() {
            return pane.display_path().is_some() || !pane.lines.is_empty();
        }
        false
    }

    pub fn code_view_path(&self) -> Option<&str> {
        self.code_workspace
            .active_pane()
            .and_then(|pane| pane.display_path())
    }

    pub fn is_code_mode(&self) -> bool {
        matches!(self.operating_mode, owlen_core::mode::Mode::Code)
    }

    pub fn code_view_lines(&self) -> &[String] {
        self.code_workspace
            .active_pane()
            .map(|pane| pane.lines.as_slice())
            .unwrap_or(&[])
    }

    pub fn code_view_scroll(&self) -> Option<&AutoScroll> {
        self.code_workspace.active_pane().map(|pane| &pane.scroll)
    }

    pub fn code_view_scroll_mut(&mut self) -> Option<&mut AutoScroll> {
        self.code_workspace
            .active_tab_mut()
            .and_then(|tab| tab.active_pane_mut())
            .map(|pane| &mut pane.scroll)
    }

    pub fn set_code_view_viewport_height(&mut self, height: usize) {
        self.code_workspace.set_active_viewport_height(height);
    }

    pub fn repo_search(&self) -> &RepoSearchState {
        &self.repo_search
    }

    pub fn repo_search_mut(&mut self) -> &mut RepoSearchState {
        &mut self.repo_search
    }

    pub fn symbol_search(&self) -> &SymbolSearchState {
        &self.symbol_search
    }

    pub fn symbol_search_mut(&mut self) -> &mut SymbolSearchState {
        &mut self.symbol_search
    }

    fn repo_search_display_path(&self, absolute: &Path) -> String {
        if let Some(relative) = diff_paths(absolute, self.file_tree().root()) {
            if relative.as_os_str().is_empty() {
                ".".to_string()
            } else {
                relative.to_string_lossy().into_owned()
            }
        } else {
            absolute.to_string_lossy().into_owned()
        }
    }

    fn ensure_repo_search_file_index(&mut self, path: &Path) -> usize {
        if let Some(index) = self.repo_search_file_map.get(path).copied() {
            return index;
        }
        let display = self.repo_search_display_path(path);
        let idx = self
            .repo_search
            .ensure_file_entry(path.to_path_buf(), display);
        self.repo_search_file_map.insert(path.to_path_buf(), idx);
        idx
    }

    fn cancel_repo_search_process(&mut self) {
        if let Some(handle) = self.repo_search_task.take() {
            handle.abort();
        }
        self.repo_search_rx = None;
    }

    fn poll_repo_search(&mut self) {
        if let Some(mut rx) = self.repo_search_rx.take() {
            use tokio::sync::mpsc::error::TryRecvError;
            let mut keep_receiver = true;
            loop {
                match rx.try_recv() {
                    Ok(message) => {
                        if !self.handle_repo_search_message(message) {
                            keep_receiver = false;
                            break;
                        }
                    }
                    Err(TryRecvError::Empty) => break,
                    Err(TryRecvError::Disconnected) => {
                        self.repo_search_task = None;
                        keep_receiver = false;
                        break;
                    }
                }
            }
            if keep_receiver {
                self.repo_search_rx = Some(rx);
            }
        }
    }

    fn handle_repo_search_message(&mut self, message: RepoSearchMessage) -> bool {
        match message {
            RepoSearchMessage::File { path } => {
                self.ensure_repo_search_file_index(&path);
                true
            }
            RepoSearchMessage::Match {
                path,
                line_number,
                column,
                preview,
                matched,
            } => {
                let idx = self.ensure_repo_search_file_index(&path);
                self.repo_search
                    .add_match(idx, line_number, column, preview, matched);
                true
            }
            RepoSearchMessage::Done { matches } => {
                self.repo_search.finish(matches);
                self.repo_search_task = None;
                self.repo_search_rx = None;
                self.status = if matches == 0 {
                    "Repo search: no matches".to_string()
                } else {
                    format!("Repo search: {matches} match(es)")
                };
                false
            }
            RepoSearchMessage::Error(err) => {
                self.repo_search.mark_error(err.clone());
                self.repo_search_task = None;
                self.repo_search_rx = None;
                self.error = Some(err.clone());
                self.status = format!("Repo search failed: {err}");
                false
            }
        }
    }

    async fn start_repo_search(&mut self) -> Result<()> {
        let Some(query) = self.repo_search.prepare_run() else {
            if self.repo_search.query_input().is_empty() {
                self.status = "Enter a search query".to_string();
            }
            return Ok(());
        };

        self.cancel_repo_search_process();
        self.repo_search_file_map.clear();
        let root = self.file_tree().root().to_path_buf();

        match spawn_repo_search_task(root, query.clone()) {
            Ok((handle, rx)) => {
                self.repo_search_task = Some(handle);
                self.repo_search_rx = Some(rx);
                self.status = format!("Searching for \"{query}\"…");
                self.error = None;
            }
            Err(err) => {
                let message = err.to_string();
                self.repo_search.mark_error(message.clone());
                self.error = Some(message.clone());
                self.status = format!("Failed to start search: {message}");
            }
        }

        Ok(())
    }

    async fn open_repo_search_match(&mut self) -> Result<()> {
        let Some((file_index, match_index)) = self.repo_search.selected_indices() else {
            self.status = "Select a match to open".to_string();
            return Ok(());
        };

        if !self.is_code_mode() {
            self.status = "Switch to code mode to open repository matches".to_string();
            self.error = None;
            return Ok(());
        }

        let (absolute, display, line_number, column) = {
            let file = &self.repo_search.files()[file_index];
            let m = &file.matches[match_index];
            (
                file.absolute.clone(),
                file.display.clone(),
                m.line_number,
                m.column,
            )
        };

        let root = self.file_tree().root().to_path_buf();
        let request_path = if absolute.starts_with(&root) {
            diff_paths(&absolute, &root)
                .filter(|rel| !rel.as_os_str().is_empty())
                .map(|rel| rel.to_string_lossy().into_owned())
                .unwrap_or_else(|| absolute.to_string_lossy().into_owned())
        } else {
            absolute.to_string_lossy().into_owned()
        };

        if !matches!(self.operating_mode, owlen_core::mode::Mode::Code) {
            self.set_mode(owlen_core::mode::Mode::Code).await;
        }

        match self.controller.read_file_with_tools(&request_path).await {
            Ok(content) => {
                self.prepare_code_view_target(FileOpenDisposition::Primary);
                self.set_code_view_content(display.clone(), Some(absolute.clone()), content);
                if let Some(pane) = self.code_workspace.active_pane_mut() {
                    pane.scroll.stick_to_bottom = false;
                    let target_line = line_number.saturating_sub(1) as usize;
                    let viewport = pane.viewport_height.max(1);
                    let scroll = target_line.saturating_sub(viewport / 2);
                    pane.scroll.scroll = scroll;
                }
                self.file_tree_mut().reveal(&absolute);
                self.focused_panel = FocusedPanel::Code;
                self.ensure_focus_valid();
                self.set_input_mode(InputMode::Normal);
                self.status = format!("Opened {}:{}:{column}", display, line_number);
                self.error = None;
            }
            Err(err) => {
                let message = format!("Failed to open {}: {}", display, err);
                self.error = Some(message.clone());
                self.status = message;
            }
        }

        Ok(())
    }

    async fn open_repo_search_scratch(&mut self) -> Result<()> {
        if !self.repo_search.has_results() {
            self.status = "No matches to open".to_string();
            return Ok(());
        }

        if !self.is_code_mode() {
            self.status = "Switch to code mode to open repository matches".to_string();
            self.error = None;
            return Ok(());
        }

        let mut buffer = String::new();
        for file in self.repo_search.files() {
            if file.matches.is_empty() {
                continue;
            }
            buffer.push_str(&format!("{}\n", file.display));
            for m in &file.matches {
                buffer.push_str(&format!(
                    "  {:>6}:{:<3} {}\n",
                    m.line_number, m.column, m.preview
                ));
            }
            buffer.push('\n');
        }

        let title = if let Some(query) = self.repo_search.last_query() {
            format!("Search results: {query}")
        } else {
            "Search results".to_string()
        };

        if !matches!(self.operating_mode, owlen_core::mode::Mode::Code) {
            self.set_mode(owlen_core::mode::Mode::Code).await;
        }

        self.code_workspace.open_new_tab();
        self.set_code_view_content(title.clone(), None::<PathBuf>, buffer);
        if let Some(pane) = self.code_workspace.active_pane_mut() {
            pane.is_dirty = false;
            pane.is_staged = false;
        }
        self.focused_panel = FocusedPanel::Code;
        self.ensure_focus_valid();
        self.set_input_mode(InputMode::Normal);
        self.status = format!("Opened scratch buffer for {title}");
        Ok(())
    }

    fn cancel_symbol_search_process(&mut self) {
        if let Some(handle) = self.symbol_search_task.take() {
            handle.abort();
        }
        self.symbol_search_rx = None;
    }

    fn poll_symbol_search(&mut self) {
        if let Some(mut rx) = self.symbol_search_rx.take() {
            use tokio::sync::mpsc::error::TryRecvError;
            let mut keep_receiver = true;
            loop {
                match rx.try_recv() {
                    Ok(message) => {
                        if !self.handle_symbol_search_message(message) {
                            keep_receiver = false;
                            break;
                        }
                    }
                    Err(TryRecvError::Empty) => break,
                    Err(TryRecvError::Disconnected) => {
                        self.symbol_search_task = None;
                        keep_receiver = false;
                        break;
                    }
                }
            }
            if keep_receiver {
                self.symbol_search_rx = Some(rx);
            }
        }
    }

    fn handle_symbol_search_message(&mut self, message: SymbolSearchMessage) -> bool {
        match message {
            SymbolSearchMessage::Symbols(batch) => {
                self.symbol_search.add_symbols(batch);
                true
            }
            SymbolSearchMessage::Done => {
                self.symbol_search.finish();
                self.symbol_search_task = None;
                self.symbol_search_rx = None;
                self.status = "Symbol index ready".to_string();
                false
            }
            SymbolSearchMessage::Error(err) => {
                self.symbol_search.mark_error(err.clone());
                self.symbol_search_task = None;
                self.symbol_search_rx = None;
                self.error = Some(err.clone());
                self.status = format!("Symbol search failed: {err}");
                false
            }
        }
    }

    async fn start_symbol_search(&mut self) -> Result<()> {
        self.cancel_symbol_search_process();
        self.symbol_search.begin_index();
        let root = self.file_tree().root().to_path_buf();
        match spawn_symbol_search_task(root) {
            Ok((handle, rx)) => {
                self.symbol_search_task = Some(handle);
                self.symbol_search_rx = Some(rx);
                self.status = "Indexing symbols…".to_string();
                self.error = None;
            }
            Err(err) => {
                let message = err.to_string();
                self.symbol_search.mark_error(message.clone());
                self.error = Some(message.clone());
                self.status = format!("Unable to start symbol search: {message}");
            }
        }
        Ok(())
    }

    async fn open_symbol_search_entry(&mut self) -> Result<()> {
        let Some(entry) = self.symbol_search.selected_entry().cloned() else {
            self.status = "Select a symbol".to_string();
            return Ok(());
        };

        let root = self.file_tree().root().to_path_buf();
        let request_path = if entry.file.starts_with(&root) {
            diff_paths(&entry.file, &root)
                .filter(|rel| !rel.as_os_str().is_empty())
                .map(|rel| rel.to_string_lossy().into_owned())
                .unwrap_or_else(|| entry.file.to_string_lossy().into_owned())
        } else {
            entry.file.to_string_lossy().into_owned()
        };

        if !matches!(self.operating_mode, owlen_core::mode::Mode::Code) {
            self.set_mode(owlen_core::mode::Mode::Code).await;
        }

        match self.controller.read_file_with_tools(&request_path).await {
            Ok(content) => {
                self.prepare_code_view_target(FileOpenDisposition::Primary);
                self.set_code_view_content(
                    entry.display_path.clone(),
                    Some(entry.file.clone()),
                    content,
                );
                if let Some(pane) = self.code_workspace.active_pane_mut() {
                    pane.scroll.stick_to_bottom = false;
                    let target_line = entry.line.saturating_sub(1) as usize;
                    let viewport = pane.viewport_height.max(1);
                    let scroll = target_line.saturating_sub(viewport / 2);
                    pane.scroll.scroll = scroll;
                }
                self.file_tree_mut().reveal(&entry.file);
                self.focused_panel = FocusedPanel::Code;
                self.ensure_focus_valid();
                self.set_input_mode(InputMode::Normal);
                self.status = format!(
                    "Jumped to {} {}:{}",
                    entry.kind.label(),
                    entry.display_path,
                    entry.line
                );
                self.error = None;
            }
            Err(err) => {
                let message = format!("Failed to open {}: {}", entry.display_path, err);
                self.error = Some(message.clone());
                self.status = message;
            }
        }

        Ok(())
    }

    pub fn code_view_viewport_height(&self) -> usize {
        self.code_workspace
            .active_pane()
            .map(|pane| pane.viewport_height)
            .unwrap_or(0)
    }

    pub fn has_loaded_code_view(&self) -> bool {
        self.code_workspace
            .active_pane()
            .map(|pane| pane.display_path().is_some() || !pane.lines.is_empty())
            .unwrap_or(false)
    }

    pub fn file_tree(&self) -> &FileTreeState {
        &self.file_tree
    }

    pub fn file_tree_mut(&mut self) -> &mut FileTreeState {
        &mut self.file_tree
    }

    pub fn file_icons(&self) -> &FileIconResolver {
        &self.file_icons
    }

    pub fn workspace(&self) -> &CodeWorkspace {
        &self.code_workspace
    }

    pub fn workspace_mut(&mut self) -> &mut CodeWorkspace {
        &mut self.code_workspace
    }

    pub fn is_file_panel_collapsed(&self) -> bool {
        self.file_panel_collapsed
    }

    pub fn set_file_panel_collapsed(&mut self, collapsed: bool) {
        self.file_panel_collapsed = collapsed;
    }

    pub fn file_panel_width(&self) -> u16 {
        self.file_panel_width
    }

    pub fn set_file_panel_width(&mut self, width: u16) -> u16 {
        const MIN_WIDTH: u16 = 24;
        const MAX_WIDTH: u16 = 80;
        let clamped = width.clamp(MIN_WIDTH, MAX_WIDTH);
        self.file_panel_width = clamped;
        clamped
    }

    pub fn expand_file_panel(&mut self) {
        if !self.is_code_mode() {
            self.status = "Switch to code mode to use the file explorer".to_string();
            self.error = None;
            return;
        }
        if self.file_panel_collapsed {
            self.file_panel_collapsed = false;
            self.focused_panel = FocusedPanel::Files;
            self.ensure_focus_valid();
        }
    }

    pub fn collapse_file_panel(&mut self) {
        if !self.file_panel_collapsed {
            self.file_panel_collapsed = true;
            if matches!(self.focused_panel, FocusedPanel::Files) {
                self.focused_panel = FocusedPanel::Chat;
            }
            self.ensure_focus_valid();
        }
    }

    pub fn toggle_file_panel(&mut self) {
        if !self.is_code_mode() {
            self.status = "File explorer is available in code mode".to_string();
            self.error = None;
            return;
        }
        if self.file_panel_collapsed {
            self.expand_file_panel();
        } else {
            self.collapse_file_panel();
        }
    }

    // Synchronous access for UI rendering and other callers that expect an immediate Config.
    pub fn config(&self) -> tokio::sync::MutexGuard<'_, owlen_core::config::Config> {
        self.controller.config()
    }

    // Asynchronous version retained for places that already await the config.
    pub async fn config_async(&self) -> tokio::sync::MutexGuard<'_, owlen_core::config::Config> {
        self.controller.config_async().await
    }

    /// Get the current operating mode
    pub fn get_mode(&self) -> owlen_core::mode::Mode {
        self.operating_mode
    }

    /// Set the operating mode
    pub async fn set_mode(&mut self, mode: owlen_core::mode::Mode) {
        if let Err(err) = self.controller.set_operating_mode(mode).await {
            self.error = Some(format!("Failed to switch mode: {}", err));
            return;
        }

        if !matches!(mode, owlen_core::mode::Mode::Code) {
            self.collapse_file_panel();
            self.close_code_view();
            self.set_system_status(String::new());
        }

        self.operating_mode = mode;
        self.status = format!("Switched to {} mode", mode);
        self.error = None;
    }

    async fn set_web_tool_enabled(&mut self, enabled: bool) -> Result<()> {
        self.controller
            .set_tool_enabled("web_search", enabled)
            .await
            .map_err(|err| anyhow!(err))?;
        config::save_config(&self.controller.config())?;
        self.refresh_usage_summary().await?;
        Ok(())
    }

    /// Override the status line with a custom message.
    pub fn set_status_message<S: Into<String>>(&mut self, status: S) {
        self.status = status.into();
    }

    pub(crate) fn model_selector_items(&self) -> &[ModelSelectorItem] {
        &self.model_selector_items
    }

    pub(crate) fn annotated_models(&self) -> &[AnnotatedModelInfo] {
        &self.annotated_models
    }

    pub(crate) fn model_filter_mode(&self) -> FilterMode {
        self.model_filter_mode
    }

    pub(crate) fn model_search_query(&self) -> &str {
        &self.model_search_query
    }

    pub(crate) fn model_search_info(&self, index: usize) -> Option<&ModelSearchInfo> {
        self.model_search_hits.get(&index)
    }

    pub(crate) fn provider_search_highlight(&self, provider: &str) -> Option<&HighlightMask> {
        self.provider_search_hits.get(provider)
    }

    pub(crate) fn visible_model_count(&self) -> usize {
        self.visible_model_count
    }

    fn update_model_filter_mode(&mut self, mode: FilterMode) {
        if self.model_filter_mode != mode {
            self.model_filter_mode = mode;
            self.model_filter_memory = mode;
            self.rebuild_model_selector_items();
        } else if !self.model_search_query.is_empty() {
            // Refresh search results against current filter
            self.rebuild_model_selector_items();
        }
    }

    fn push_model_search_char(&mut self, ch: char) {
        if ch.is_control() {
            return;
        }
        self.model_search_query.push(ch);
        self.rebuild_model_selector_items();
        self.update_model_search_status();
    }

    fn pop_model_search_char(&mut self) {
        self.model_search_query.pop();
        self.rebuild_model_selector_items();
        self.update_model_search_status();
    }

    fn clear_model_search_query(&mut self) {
        if self.model_search_query.is_empty() {
            return;
        }
        self.model_search_query.clear();
        self.rebuild_model_selector_items();
        self.update_model_search_status();
    }

    fn reset_model_picker_state(&mut self) {
        if !self.model_search_query.is_empty() {
            self.model_search_query.clear();
        }
        self.model_search_hits.clear();
        self.provider_search_hits.clear();
        self.visible_model_count = 0;
    }

    fn update_model_search_status(&mut self) {
        if !matches!(
            self.mode,
            InputMode::ModelSelection | InputMode::ProviderSelection
        ) {
            return;
        }
        if self.model_search_query.is_empty() {
            self.status = "Select a model to use".to_string();
        } else {
            let count = self.visible_model_count();
            if count == 1 {
                self.status = format!("Search \"{}\" → 1 match", self.model_search_query.trim());
            } else {
                self.status = format!(
                    "Search \"{}\" → {} matches",
                    self.model_search_query.trim(),
                    count
                );
            }
        }
    }

    pub fn selected_model_item(&self) -> Option<usize> {
        self.selected_model_item
    }

    pub(crate) fn model_info_by_index(&self, index: usize) -> Option<&ModelInfo> {
        self.models.get(index)
    }

    pub fn cached_model_detail(&self, model_name: &str) -> Option<&DetailedModelInfo> {
        self.model_details_cache.get(model_name)
    }

    pub fn model_info_panel_mut(&mut self) -> &mut ModelInfoPanel {
        &mut self.model_info_panel
    }

    pub fn is_model_info_visible(&self) -> bool {
        self.show_model_info
    }

    pub fn set_model_info_visible(&mut self, visible: bool) {
        self.show_model_info = visible;
        if !visible {
            self.model_info_panel.reset_scroll();
            self.model_info_viewport_height = 0;
        }
    }

    pub fn set_model_info_viewport_height(&mut self, height: usize) {
        self.model_info_viewport_height = height;
    }

    pub fn model_info_viewport_height(&self) -> usize {
        self.model_info_viewport_height
    }

    pub async fn ensure_model_details(
        &mut self,
        model_name: &str,
        force_refresh: bool,
    ) -> Result<()> {
        if !force_refresh
            && self.show_model_info
            && self
                .model_info_panel
                .current_model_name()
                .is_some_and(|name| name == model_name)
        {
            self.set_model_info_visible(false);
            self.status = "Closed model info panel".to_string();
            self.error = None;
            return Ok(());
        }

        if !force_refresh {
            if let Some(info) = self.model_details_cache.get(model_name).cloned() {
                self.model_info_panel.set_model_info(info);
                self.set_model_info_visible(true);
                self.status = format!("Showing model info for {}", model_name);
                self.error = None;
                return Ok(());
            }
        } else {
            self.model_details_cache.remove(model_name);
            self.controller.invalidate_model_details(model_name).await;
        }

        match self
            .controller
            .model_details(model_name, force_refresh)
            .await
        {
            Ok(details) => {
                self.model_details_cache
                    .insert(model_name.to_string(), details.clone());
                self.model_info_panel.set_model_info(details);
                self.set_model_info_visible(true);
                self.status = if force_refresh {
                    format!("Refreshed model info for {}", model_name)
                } else {
                    format!("Showing model info for {}", model_name)
                };
                self.error = None;
                Ok(())
            }
            Err(err) => {
                self.error = Some(format!("Failed to load model info: {}", err));
                Err(err.into())
            }
        }
    }

    pub async fn prefetch_all_model_details(&mut self, force_refresh: bool) -> Result<()> {
        if force_refresh {
            self.controller.clear_model_details_cache().await;
        }

        match self.controller.all_model_details(force_refresh).await {
            Ok(details) => {
                if force_refresh {
                    self.model_details_cache.clear();
                }
                for info in details {
                    self.model_details_cache.insert(info.name.clone(), info);
                }
                if let Some(current) = self
                    .model_info_panel
                    .current_model_name()
                    .map(|s| s.to_string())
                {
                    if let Some(updated) = self.model_details_cache.get(&current).cloned() {
                        self.model_info_panel.set_model_info(updated);
                    }
                }
                let total = self.model_details_cache.len();
                self.status = format!("Cached model details for {} model(s)", total);
                self.error = None;
                Ok(())
            }
            Err(err) => {
                self.error = Some(format!("Failed to prefetch model info: {}", err));
                Err(err.into())
            }
        }
    }

    pub fn auto_scroll(&self) -> &AutoScroll {
        &self.auto_scroll
    }

    pub fn auto_scroll_mut(&mut self) -> &mut AutoScroll {
        &mut self.auto_scroll
    }

    pub fn scroll(&self) -> usize {
        self.auto_scroll.scroll
    }

    pub fn thinking_scroll(&self) -> &AutoScroll {
        &self.thinking_scroll
    }

    pub fn thinking_scroll_mut(&mut self) -> &mut AutoScroll {
        &mut self.thinking_scroll
    }

    pub fn thinking_scroll_position(&self) -> usize {
        self.thinking_scroll.scroll
    }

    pub fn message_count(&self) -> usize {
        self.controller.conversation().messages.len()
    }

    pub fn streaming_count(&self) -> usize {
        self.streaming.len()
    }

    pub fn formatter(&self) -> &owlen_core::formatting::MessageFormatter {
        self.controller.formatter()
    }

    pub fn input_buffer(&self) -> &owlen_core::input::InputBuffer {
        self.controller.input_buffer()
    }

    pub fn input_buffer_mut(&mut self) -> &mut owlen_core::input::InputBuffer {
        self.controller.input_buffer_mut()
    }

    pub fn textarea(&self) -> &TextArea<'static> {
        &self.textarea
    }

    pub fn textarea_mut(&mut self) -> &mut TextArea<'static> {
        &mut self.textarea
    }

    pub fn system_status(&self) -> &str {
        &self.system_status
    }

    pub fn set_system_status(&mut self, status: String) {
        self.system_status = status;
    }

    pub fn append_system_status(&mut self, status: &str) {
        if !self.system_status.is_empty() {
            self.system_status.push_str(" | ");
        }
        self.system_status.push_str(status);
    }

    pub fn clear_system_status(&mut self) {
        self.system_status.clear();
    }

    pub fn show_tutorial(&mut self) {
        self.error = None;
        self.status = TUTORIAL_STATUS.to_string();
        self.system_status = TUTORIAL_SYSTEM_STATUS.to_string();
        let tutorial_body = concat!(
            "Keybindings overview:\n",
            "  • Movement: h/j/k/l, gg/G, w/b\n",
            "  • Insert text: i or a (Esc to exit)\n",
            "  • Visual select: v (Esc to exit)\n",
            "  • Command mode: : (press Enter to run, Esc to cancel)\n",
            "  • Send message: Enter in Insert mode\n",
            "  • Help overlay: F1 or ?\n"
        );
        self.controller
            .conversation_mut()
            .push_system_message(tutorial_body.to_string());
    }

    pub fn command_buffer(&self) -> &str {
        self.command_palette.buffer()
    }

    pub fn command_suggestions(&self) -> &[PaletteSuggestion] {
        self.command_palette.suggestions()
    }

    fn set_input_mode(&mut self, mode: InputMode) {
        if self.mode != mode {
            self.mode_flash_until = Some(Instant::now() + Duration::from_millis(240));
        }
        if !matches!(
            mode,
            InputMode::ModelSelection | InputMode::ProviderSelection
        ) && matches!(
            self.mode,
            InputMode::ModelSelection | InputMode::ProviderSelection
        ) {
            self.reset_model_picker_state();
        }
        self.mode = mode;
        let _ = self.apply_app_event(AppEvent::Composer(ComposerEvent::ModeChanged { mode }));
    }

    pub fn mode_flash_active(&self) -> bool {
        self.mode_flash_until
            .map(|deadline| Instant::now() < deadline)
            .unwrap_or(false)
    }

    pub fn selected_suggestion(&self) -> usize {
        self.command_palette.selected_index()
    }

    /// Returns all available commands with their aliases
    /// Complete the current command with the selected suggestion
    fn complete_command(&mut self) {
        if let Some(suggestion) = self.command_palette.apply_selected() {
            self.status = format!(":{}", suggestion);
        }
    }

    pub fn focused_panel(&self) -> FocusedPanel {
        self.focused_panel
    }

    pub fn visual_selection(&self) -> Option<((usize, usize), (usize, usize))> {
        if let (Some(start), Some(end)) = (self.visual_start, self.visual_end) {
            Some((start, end))
        } else {
            None
        }
    }

    pub fn chat_cursor(&self) -> (usize, usize) {
        self.chat_cursor
    }

    pub fn thinking_cursor(&self) -> (usize, usize) {
        self.thinking_cursor
    }

    pub fn saved_sessions(&self) -> &[SessionMeta] {
        &self.saved_sessions
    }

    pub fn selected_session_index(&self) -> usize {
        self.selected_session_index
    }

    pub fn help_tab_index(&self) -> usize {
        self.help_tab_index
    }

    pub fn available_themes(&self) -> &[String] {
        &self.available_themes
    }

    pub fn selected_theme_index(&self) -> usize {
        self.selected_theme_index
    }

    pub fn theme(&self) -> &Theme {
        &self.theme
    }

    pub(crate) fn set_layout_snapshot(&mut self, snapshot: LayoutSnapshot) {
        self.last_layout = snapshot;
    }

    fn region_for_position(&self, column: u16, row: u16) -> Option<UiRegion> {
        self.last_layout.region_at(column, row)
    }

    pub fn current_keymap_profile(&self) -> KeymapProfile {
        self.current_keymap_profile
    }

    fn reload_keymap_from_config(&mut self) -> Result<()> {
        let registry = CommandRegistry::default();
        let config = self.controller.config();
        let keymap_path = config.ui.keymap_path.clone();
        let keymap_profile = config.ui.keymap_profile.clone();
        drop(config);

        self.keymap = Keymap::load(keymap_path.as_deref(), keymap_profile.as_deref(), &registry);
        self.current_keymap_profile = self.keymap.profile();
        Ok(())
    }

    async fn switch_keymap_profile(&mut self, profile: KeymapProfile) -> Result<()> {
        if self.current_keymap_profile == profile {
            self.status = format!("Keymap already set to {}", profile.label());
            self.error = None;
            return Ok(());
        }

        {
            let mut cfg = self.controller.config_mut();
            cfg.ui.keymap_profile = Some(profile.config_value().to_string());
            cfg.ui.keymap_path = None;
            config::save_config(&cfg)?;
        }

        self.reload_keymap_from_config()?;
        self.status = format!("Keymap switched to {}", profile.label());
        self.error = None;
        Ok(())
    }

    pub fn is_debug_log_visible(&self) -> bool {
        self.debug_log.is_visible()
    }

    pub fn toggle_debug_log_panel(&mut self) {
        let now_visible = self.debug_log.toggle_visible();
        if now_visible {
            self.status = "Debug log open — F12 to hide".to_string();
            self.error = None;
        } else {
            self.status = "Debug log hidden".to_string();
            self.error = None;
        }
    }

    pub fn debug_log_entries(&self) -> Vec<DebugLogEntry> {
        self.debug_log.entries()
    }

    pub fn toasts(&self) -> impl Iterator<Item = &Toast> {
        self.toasts.iter()
    }

    pub fn push_toast(&mut self, level: ToastLevel, message: impl Into<String>) {
        self.toasts.push(message, level);
    }

    fn prune_toasts(&mut self) {
        self.toasts.retain_active();
    }

    fn poll_debug_log_updates(&mut self) {
        let new_entries = self.debug_log.take_unseen();
        if new_entries.is_empty() {
            return;
        }

        let mut latest_summary: Option<(Level, String)> = None;

        for entry in new_entries.iter() {
            let toast_level = match entry.level {
                Level::Error => ToastLevel::Error,
                Level::Warn => ToastLevel::Warning,
                _ => continue,
            };

            let summary = format!("{}: {}", entry.target, entry.message);
            let clipped = Self::ellipsize(&summary, 120);
            self.push_toast(toast_level, clipped.clone());
            latest_summary = Some((entry.level, clipped));
        }

        if !self.debug_log.is_visible() {
            if let Some((level, message)) = latest_summary {
                let level_label = match level {
                    Level::Error => "Error",
                    Level::Warn => "Warning",
                    _ => "Log",
                };
                self.status = format!("{level_label}: {message}  (F12 to open debug log)");
                self.error = None;
            }
        }
    }

    fn ellipsize(message: &str, max_len: usize) -> String {
        if message.chars().count() <= max_len {
            return message.to_string();
        }

        let mut truncated = String::new();
        for (idx, ch) in message.chars().enumerate() {
            if idx + 1 >= max_len {
                truncated.push('…');
                break;
            }
            truncated.push(ch);
        }
        truncated
    }

    pub fn input_max_rows(&self) -> u16 {
        let config = self.controller.config();
        config.ui.input_max_rows.max(1)
    }

    pub fn active_model_label(&self) -> String {
        let active_id = self.controller.selected_model();
        if let Some(model) = self
            .models
            .iter()
            .find(|m| m.id == active_id || m.name == active_id)
        {
            Self::display_name_for_model(model)
        } else {
            active_id.to_string()
        }
    }

    pub fn is_loading(&self) -> bool {
        self.is_loading
    }

    pub fn is_streaming(&self) -> bool {
        !self.streaming.is_empty()
    }

    pub fn scrollback_limit(&self) -> usize {
        let limit = {
            let config = self.controller.config();
            config.ui.scrollback_lines
        };
        if limit == 0 { usize::MAX } else { limit }
    }

    pub fn has_new_message_alert(&self) -> bool {
        self.new_message_alert
    }

    pub fn clear_new_message_alert(&mut self) {
        self.new_message_alert = false;
    }

    fn notify_new_activity(&mut self) {
        if !self.auto_scroll.stick_to_bottom {
            self.new_message_alert = true;
        }
    }

    fn update_new_message_alert_after_scroll(&mut self) {
        if self.auto_scroll.stick_to_bottom {
            self.clear_new_message_alert();
        }
    }

    fn model_palette_entries(&self) -> Vec<ModelPaletteEntry> {
        self.models
            .iter()
            .map(|model| ModelPaletteEntry {
                id: model.id.clone(),
                name: model.name.clone(),
                provider: model.provider.clone(),
            })
            .collect()
    }

    fn update_command_palette_catalog(&mut self) {
        let providers = self.available_providers.clone();
        let models = self.model_palette_entries();
        self.command_palette
            .update_dynamic_sources(models, providers);
    }

    async fn refresh_resource_catalog(&mut self) -> Result<()> {
        let mut resources = self.controller.configured_resources().await;
        resources.sort_by(|a, b| a.server.cmp(&b.server).then(a.uri.cmp(&b.uri)));
        self.resource_catalog = resources;
        Ok(())
    }

    async fn refresh_mcp_slash_commands(&mut self) -> Result<()> {
        let mut commands = Vec::new();
        for (server, descriptor) in self.controller.list_mcp_tools().await {
            if !Self::tool_supports_slash(&descriptor) {
                continue;
            }
            let description = if descriptor.description.trim().is_empty() {
                None
            } else {
                Some(descriptor.description.clone())
            };
            commands.push(McpSlashCommand::new(
                server,
                descriptor.name.clone(),
                description,
            ));
        }
        slash::set_mcp_commands(commands);
        Ok(())
    }

    fn tool_supports_slash(descriptor: &McpToolDescriptor) -> bool {
        if descriptor.name.trim().is_empty() {
            return false;
        }
        Self::tool_allows_empty_arguments(&descriptor.input_schema)
    }

    fn tool_allows_empty_arguments(schema: &Value) -> bool {
        match schema {
            Value::Object(map) => {
                if let Some(Value::Array(required)) = map.get("required") {
                    !required
                        .iter()
                        .any(|entry| entry.as_str().is_some_and(|s| !s.is_empty()))
                } else {
                    true
                }
            }
            _ => true,
        }
    }

    fn format_mcp_slash_message(server: &str, tool: &str, response: &McpToolResponse) -> String {
        let status = if response.success { "✓" } else { "✗" };
        let payload = if response.success {
            Self::extract_mcp_primary_text(&response.output)
        } else {
            Self::extract_mcp_error(&response.output)
                .or_else(|| Self::extract_mcp_primary_text(&response.output))
        }
        .unwrap_or_else(|| Self::pretty_print_value(&response.output));

        if payload.trim().is_empty() {
            return format!("MCP {server}::{tool} {status}");
        }

        if payload.contains('\n') {
            format!("MCP {server}::{tool} {status}\n```json\n{payload}\n```")
        } else {
            format!("MCP {server}::{tool} {status}\n{payload}")
        }
    }

    fn extract_mcp_primary_text(value: &Value) -> Option<String> {
        if let Some(text) = value.as_str().filter(|text| !text.trim().is_empty()) {
            return Some(text.to_string());
        }

        if let Value::Object(map) = value {
            const CANDIDATES: [&str; 6] =
                ["rendered", "text", "content", "value", "message", "body"];
            for key in CANDIDATES {
                if let Some(Value::String(text)) = map.get(key) {
                    if !text.trim().is_empty() {
                        return Some(text.clone());
                    }
                }
            }

            if let Some(Value::Array(items)) = map.get("lines") {
                let mut collected = Vec::new();
                for item in items {
                    if let Some(segment) = item.as_str() {
                        if !segment.trim().is_empty() {
                            collected.push(segment.trim());
                        }
                    }
                }
                if !collected.is_empty() {
                    return Some(collected.join("\n"));
                }
            }
        }

        None
    }

    fn extract_mcp_error(value: &Value) -> Option<String> {
        if let Value::Object(map) = value {
            if let Some(Value::String(message)) = map.get("error") {
                if !message.trim().is_empty() {
                    return Some(message.clone());
                }
            }
        }
        None
    }

    fn pretty_print_value(value: &Value) -> String {
        serde_json::to_string_pretty(value).unwrap_or_else(|_| value.to_string())
    }

    async fn resolve_pending_resource_references(&mut self) -> Result<()> {
        if self.pending_resource_refs.is_empty() {
            return Ok(());
        }

        let mut resolved = 0usize;
        let references: Vec<String> = self.pending_resource_refs.drain(..).collect();
        for reference in references {
            match self.controller.resolve_resource_reference(&reference).await {
                Ok(Some(content)) => {
                    let message = format!("Resource @{}:\n{}", reference, content);
                    self.controller
                        .conversation_mut()
                        .push_system_message(message);
                    resolved += 1;
                }
                Ok(None) => {
                    self.push_toast(
                        ToastLevel::Warning,
                        format!(
                            "Resource @{} is not defined in the current project.",
                            reference
                        ),
                    );
                }
                Err(err) => {
                    self.push_toast(
                        ToastLevel::Error,
                        format!("Failed to load resource @{}: {}", reference, err),
                    );
                }
            }
        }

        if resolved > 0 {
            self.status = format!("Inserted {resolved} resource snippet(s).");
        }

        Ok(())
    }

    fn complete_resource_reference(&mut self) -> bool {
        if self.resource_catalog.is_empty() {
            return false;
        }

        let (row, col) = self.textarea.cursor();
        let lines = self.textarea.lines().to_vec();
        if row >= lines.len() {
            return false;
        }

        let line = &lines[row];
        let chars: Vec<char> = line.chars().collect();
        if col > chars.len() {
            return false;
        }

        let mut start = col;
        while start > 0 {
            let ch = chars[start - 1];
            if ch == '@' {
                start -= 1;
                break;
            }
            if ch.is_whitespace() {
                return false;
            }
            start -= 1;
        }

        if start >= col || chars.get(start) != Some(&'@') {
            return false;
        }

        if chars[start + 1..col].iter().any(|ch| ch.is_whitespace()) {
            return false;
        }

        let mut end = col;
        while end < chars.len() {
            let ch = chars[end];
            if ch.is_whitespace() {
                break;
            }
            end += 1;
        }

        let typed_prefix: String = chars[start + 1..col].iter().collect();
        let trailing_segment: String = chars[col..end].iter().collect();
        let lower_prefix = typed_prefix.to_ascii_lowercase();
        let lower_full = format!("{}{}", typed_prefix, trailing_segment).to_ascii_lowercase();

        let mut matches: Vec<&McpResourceConfig> = self
            .resource_catalog
            .iter()
            .filter(|resource| {
                let reference = format!("{}:{}", resource.server, resource.uri);
                let lower_reference = reference.to_ascii_lowercase();
                lower_reference.starts_with(&lower_full)
                    || lower_reference.starts_with(&lower_prefix)
                    || resource
                        .title
                        .as_ref()
                        .map(|title| title.to_ascii_lowercase().starts_with(&lower_prefix))
                        .unwrap_or(false)
            })
            .collect();

        if matches.is_empty() {
            return false;
        }

        matches.sort_by(|a, b| a.server.cmp(&b.server).then(a.uri.cmp(&b.uri)));
        let (selected_server, selected_uri, selected_title) = {
            let selected = matches[0];
            (
                selected.server.clone(),
                selected.uri.clone(),
                selected.title.clone(),
            )
        };
        let replacement = format!("@{}:{}", selected_server, selected_uri);

        let mut new_line = String::new();
        new_line.extend(chars[..start].iter());
        new_line.push_str(&replacement);
        new_line.extend(chars[end..].iter());

        let mut new_lines = lines;
        new_lines[row] = new_line;
        self.textarea = TextArea::new(new_lines);
        configure_textarea_defaults(&mut self.textarea);

        let new_col = start + replacement.len();
        self.textarea
            .move_cursor(CursorMove::Jump(row as u16, new_col as u16));

        self.sync_textarea_to_buffer();

        if let Some(title) = selected_title.as_deref() {
            self.status = format!("Inserted resource {} ({title}).", replacement);
        } else {
            self.status = format!("Inserted resource {}.", replacement);
        }
        self.error = None;

        true
    }

    fn extract_resource_references(text: &str) -> Vec<String> {
        let mut references = Vec::new();
        let mut current = String::new();
        let mut in_reference = false;

        for ch in text.chars() {
            if in_reference {
                if ch.is_whitespace() || matches!(ch, ',' | ';' | ')' | '(' | '.' | '!' | '?') {
                    if current.contains(':') {
                        references.push(current.clone());
                    }
                    current.clear();
                    in_reference = false;
                } else {
                    current.push(ch);
                }
            } else if ch == '@' {
                in_reference = true;
                current.clear();
            }
        }

        if in_reference && current.contains(':') {
            references.push(current);
        }

        references
    }

    pub(crate) fn display_name_for_model(model: &ModelInfo) -> String {
        let base = {
            let trimmed = model.name.trim();
            if trimmed.is_empty() {
                model.id.as_str()
            } else {
                trimmed
            }
        };

        let scope = Self::model_scope_from_capabilities(model);
        let scope_suffix = match &scope {
            ModelScope::Local => "local".to_string(),
            ModelScope::Cloud => "cloud".to_string(),
            ModelScope::Other(other) => other.trim().to_ascii_lowercase(),
        };

        if scope_suffix.is_empty() {
            base.to_string()
        } else {
            let lower = base.to_ascii_lowercase();
            if lower.contains(&format!("· {}", scope_suffix)) {
                base.to_string()
            } else {
                format!("{base} · {scope_suffix}")
            }
        }
    }

    fn role_style(theme: &Theme, role: &Role) -> Style {
        match role {
            Role::User => Style::default().fg(theme.user_message_role),
            Role::Assistant => Style::default().fg(theme.assistant_message_role),
            Role::System => Style::default().fg(theme.mode_command),
            Role::Tool => Style::default().fg(theme.info),
        }
    }

    fn message_border_style(theme: &Theme, role: &Role) -> Style {
        let base_color = match role {
            Role::User => theme.user_message_role,
            Role::Assistant => theme.assistant_message_role,
            Role::System => theme.mode_command,
            Role::Tool => theme.info,
        };

        let dimmed = Self::dim_color(base_color);

        Style::default().fg(dimmed).add_modifier(Modifier::DIM)
    }

    fn content_style(theme: &Theme, role: &Role) -> Style {
        if matches!(role, Role::Tool) {
            Style::default().fg(theme.tool_output)
        } else {
            Style::default()
        }
    }

    fn dim_color(color: Color) -> Color {
        match color {
            Color::Reset | Color::Indexed(_) => color,
            _ => {
                if let Some((r, g, b)) = Self::color_to_rgb(color) {
                    let dim_component = |component: u8| -> u8 {
                        let value = ((component as u16) * 2) / 5;
                        value as u8
                    };
                    Color::Rgb(dim_component(r), dim_component(g), dim_component(b))
                } else {
                    color
                }
            }
        }
    }

    fn color_to_rgb(color: Color) -> Option<(u8, u8, u8)> {
        match color {
            Color::Black => Some((0, 0, 0)),
            Color::Red => Some((205, 0, 0)),
            Color::Green => Some((0, 205, 0)),
            Color::Yellow => Some((205, 205, 0)),
            Color::Blue => Some((0, 0, 205)),
            Color::Magenta => Some((205, 0, 205)),
            Color::Cyan => Some((0, 205, 205)),
            Color::Gray => Some((170, 170, 170)),
            Color::DarkGray => Some((85, 85, 85)),
            Color::LightRed => Some((255, 85, 85)),
            Color::LightGreen => Some((85, 255, 85)),
            Color::LightYellow => Some((255, 255, 85)),
            Color::LightBlue => Some((85, 85, 255)),
            Color::LightMagenta => Some((255, 85, 255)),
            Color::LightCyan => Some((85, 255, 255)),
            Color::White => Some((255, 255, 255)),
            Color::Rgb(r, g, b) => Some((r, g, b)),
            Color::Reset | Color::Indexed(_) => None,
        }
    }

    fn message_content_hash(role: &Role, content: &str, tool_signature: &str) -> u64 {
        let mut hasher = DefaultHasher::new();
        role.to_string().hash(&mut hasher);
        content.hash(&mut hasher);
        tool_signature.hash(&mut hasher);
        hasher.finish()
    }

    fn invalidate_message_cache(&mut self, id: &Uuid) {
        self.message_line_cache.remove(id);
    }

    fn sync_ui_preferences_from_config(&mut self) {
        let (show_cursor, role_label_mode, syntax_highlighting, render_markdown, show_timestamps) = {
            let guard = self.controller.config();
            (
                guard.ui.show_cursor_outside_insert,
                guard.ui.role_label_mode,
                guard.ui.syntax_highlighting,
                guard.ui.render_markdown,
                guard.ui.show_timestamps,
            )
        };
        self.show_cursor_outside_insert = show_cursor;
        self.syntax_highlighting = syntax_highlighting;
        self.render_markdown = render_markdown;
        self.show_message_timestamps = show_timestamps;
        self.controller.set_role_label_mode(role_label_mode);
        self.message_line_cache.clear();
    }

    pub fn cursor_should_be_visible(&self) -> bool {
        if matches!(self.mode, InputMode::Editing) {
            true
        } else {
            self.show_cursor_outside_insert
        }
    }

    pub fn should_highlight_code(&self) -> bool {
        true
    }

    pub fn render_markdown_enabled(&self) -> bool {
        self.render_markdown
    }

    pub fn set_render_markdown(&mut self, enabled: bool) {
        if self.render_markdown == enabled {
            self.status = if enabled {
                "Markdown rendering already enabled".to_string()
            } else {
                "Markdown rendering already disabled".to_string()
            };
            self.error = None;
            return;
        }

        self.render_markdown = enabled;
        self.message_line_cache.clear();

        {
            let mut guard = self.controller.config_mut();
            guard.ui.render_markdown = enabled;
        }

        if let Err(err) = config::save_config(&self.controller.config()) {
            self.error = Some(format!("Failed to save config: {}", err));
        } else {
            self.error = None;
        }

        self.status = if enabled {
            "Markdown rendering enabled".to_string()
        } else {
            "Markdown rendering disabled".to_string()
        };
    }

    pub(crate) fn render_message_lines_cached(
        &mut self,
        message_index: usize,
        ctx: MessageRenderContext<'_>,
    ) -> Vec<Line<'static>> {
        let MessageRenderContext {
            formatter,
            role_label_mode,
            body_width,
            card_width,
            is_streaming,
            loading_indicator,
            theme,
            syntax_highlighting,
            render_markdown,
        } = ctx;
        let (message_id, role, raw_content, timestamp, tool_calls, tool_result_id) = {
            let conversation = self.conversation();
            let message = &conversation.messages[message_index];
            (
                message.id,
                message.role.clone(),
                message.content.clone(),
                message.timestamp,
                message.tool_calls.clone(),
                message
                    .metadata
                    .get("tool_call_id")
                    .and_then(|value| value.as_str())
                    .map(|value| value.to_string()),
            )
        };

        let display_content = if matches!(role, Role::Assistant) {
            formatter.extract_thinking(&raw_content).0
        } else if matches!(role, Role::Tool) {
            format_tool_output(&raw_content)
        } else {
            raw_content
        };

        let normalized_content = display_content.replace("\r\n", "\n");
        let trimmed = normalized_content.trim();
        let content = trimmed.to_string();
        let segments = parse_message_segments(trimmed, render_markdown);
        let tool_signature = tool_calls
            .as_ref()
            .map(|calls| {
                let mut names: Vec<&str> = calls.iter().map(|call| call.name.as_str()).collect();
                names.sort_unstable();
                names.join("|")
            })
            .unwrap_or_default();
        let content_hash = Self::message_content_hash(&role, &content, &tool_signature);

        if !is_streaming {
            if let Some(entry) = self.message_line_cache.get(&message_id) {
                if entry.wrap_width == card_width
                    && entry.role_label_mode == role_label_mode
                    && entry.syntax_highlighting == syntax_highlighting
                    && entry.render_markdown == render_markdown
                    && entry.theme_name == theme.name
                    && entry.show_timestamps == self.show_message_timestamps
                    && entry.metrics.body_width == body_width
                    && entry.metrics.card_width == card_width
                    && entry.content_hash == content_hash
                {
                    return entry.lines.clone();
                }
            }
        }

        let mut rendered: Vec<Line<'static>> = Vec::new();
        let content_style = Self::content_style(theme, &role);
        let mut indicator_target: Option<usize> = None;

        let indicator_span = if is_streaming {
            Some(Span::styled(
                format!(" {}", streaming_indicator_symbol(loading_indicator)),
                Style::default().fg(theme.cursor),
            ))
        } else {
            None
        };

        let mut append_segments = |segments: &[MessageSegment],
                                   indent: &str,
                                   available_width: usize,
                                   indicator_target: &mut Option<usize>,
                                   code_width: usize| {
            if segments.is_empty() {
                let line_text = if indent.is_empty() {
                    String::new()
                } else {
                    indent.to_string()
                };
                rendered.push(Line::from(vec![Span::styled(line_text, content_style)]));
                *indicator_target = Some(rendered.len() - 1);
                return;
            }

            for segment in segments {
                match segment {
                    MessageSegment::Text { lines } => {
                        if render_markdown {
                            let block = lines.join("\n");
                            let markdown_lines = render_markdown_lines(
                                &block,
                                indent,
                                available_width,
                                content_style,
                            );
                            for line in markdown_lines {
                                rendered.push(line);
                                *indicator_target = Some(rendered.len() - 1);
                            }
                        } else {
                            for line_text in lines {
                                let mut chunks = wrap_unicode(line_text.as_str(), available_width);
                                if chunks.is_empty() {
                                    chunks.push(String::new());
                                }
                                for chunk in chunks {
                                    let mut spans: Vec<Span<'static>> = Vec::new();
                                    if !indent.is_empty() {
                                        spans.push(Span::styled(indent.to_string(), content_style));
                                    }

                                    let inline_spans =
                                        inline_code_spans_from_text(&chunk, theme, content_style);
                                    spans.extend(inline_spans);

                                    rendered.push(Line::from(spans));
                                    *indicator_target = Some(rendered.len() - 1);
                                }
                            }
                        }
                    }
                    MessageSegment::CodeBlock { language, lines } => {
                        append_code_block_lines(
                            &mut rendered,
                            indent,
                            code_width,
                            language.as_deref(),
                            lines,
                            theme,
                            syntax_highlighting,
                            indicator_target,
                        );
                    }
                }
            }
        };

        match role_label_mode {
            RoleLabelDisplay::Above => {
                let indent = "  ";
                let indent_width = UnicodeWidthStr::width(indent);
                let available_width = body_width.saturating_sub(indent_width).max(1);
                append_segments(
                    &segments,
                    indent,
                    available_width,
                    &mut indicator_target,
                    body_width.saturating_sub(indent_width),
                );
            }
            RoleLabelDisplay::Inline | RoleLabelDisplay::None => {
                let indent = "";
                let available_width = body_width.max(1);
                append_segments(
                    &segments,
                    indent,
                    available_width,
                    &mut indicator_target,
                    body_width,
                );
            }
        }
        if let Some(indicator) = indicator_span {
            if let Some(idx) = indicator_target {
                if let Some(line) = rendered.get_mut(idx) {
                    line.spans.push(indicator);
                } else {
                    rendered.push(Line::from(vec![indicator]));
                }
            } else {
                rendered.push(Line::from(vec![indicator]));
            }
        }

        let markers =
            Self::message_tool_markers(&role, tool_calls.as_ref(), tool_result_id.as_deref());
        let formatted_timestamp = if self.show_message_timestamps {
            Some(Self::format_message_timestamp(timestamp))
        } else {
            None
        };

        let card_lines = Self::wrap_message_in_card(
            rendered,
            &role,
            formatted_timestamp.as_deref(),
            &markers,
            card_width,
            theme,
        );
        let metrics = MessageLayoutMetrics {
            line_count: card_lines.len(),
            body_width,
            card_width,
        };
        debug_assert_eq!(metrics.line_count, card_lines.len());

        if !is_streaming {
            self.message_line_cache.insert(
                message_id,
                MessageCacheEntry {
                    theme_name: theme.name.clone(),
                    wrap_width: card_width,
                    role_label_mode,
                    syntax_highlighting,
                    render_markdown,
                    show_timestamps: self.show_message_timestamps,
                    content_hash,
                    lines: card_lines.clone(),
                    metrics: metrics.clone(),
                },
            );
        }

        card_lines
    }

    fn message_tool_markers(
        role: &Role,
        tool_calls: Option<&Vec<owlen_core::types::ToolCall>>,
        tool_result_id: Option<&str>,
    ) -> Vec<String> {
        let mut markers = Vec::new();

        match role {
            Role::Assistant => {
                if let Some(calls) = tool_calls {
                    const MAX_VISIBLE: usize = 3;
                    for call in calls.iter().take(MAX_VISIBLE) {
                        markers.push(format!("[Tool: {}]", call.name));
                    }
                    if calls.len() > MAX_VISIBLE {
                        markers.push(format!("[+{}]", calls.len() - MAX_VISIBLE));
                    }
                }
            }
            Role::Tool => {
                if let Some(id) = tool_result_id {
                    markers.push(format!("[Result: {id}]"));
                } else {
                    markers.push("[Result]".to_string());
                }
            }
            _ => {}
        }

        markers
    }

    fn format_message_timestamp(timestamp: SystemTime) -> String {
        let datetime: DateTime<Local> = timestamp.into();
        datetime.format("%H:%M").to_string()
    }

    fn wrap_message_in_card(
        mut lines: Vec<Line<'static>>,
        role: &Role,
        timestamp: Option<&str>,
        markers: &[String],
        card_width: usize,
        theme: &Theme,
    ) -> Vec<Line<'static>> {
        if card_width < MIN_MESSAGE_CARD_WIDTH {
            return Self::wrap_message_compact(lines, role, timestamp, markers, theme);
        }

        let inner_width = card_width.saturating_sub(4).max(1);
        let mut card_lines = Vec::with_capacity(lines.len() + 2);

        card_lines.push(Self::build_card_header(
            role, timestamp, markers, card_width, theme,
        ));

        if lines.is_empty() {
            lines.push(Line::from(String::new()));
        }

        for line in lines {
            card_lines.push(Self::wrap_card_body_line(line, inner_width, theme, role));
        }

        card_lines.push(Self::build_card_footer(card_width, theme, role));
        card_lines
    }

    fn wrap_message_compact(
        lines: Vec<Line<'static>>,
        role: &Role,
        timestamp: Option<&str>,
        markers: &[String],
        theme: &Theme,
    ) -> Vec<Line<'static>> {
        let role_style = Self::role_style(theme, role).add_modifier(Modifier::BOLD);
        let meta_style = Style::default().fg(theme.placeholder);
        let tool_style = Style::default()
            .fg(theme.tool_output)
            .add_modifier(Modifier::BOLD);

        let (emoji, title) = role_label_parts(role);
        let mut header_spans: Vec<Span<'static>> =
            vec![Span::styled(format!("{emoji} {title}"), role_style)];

        if let Some(ts) = timestamp {
            header_spans.push(Span::styled(" · ".to_string(), meta_style));
            header_spans.push(Span::styled(ts.to_string(), meta_style));
        }

        for marker in markers {
            header_spans.push(Span::styled(" ".to_string(), meta_style));
            header_spans.push(Span::styled(marker.clone(), tool_style));
        }

        let mut compact_lines = Vec::with_capacity(lines.len() + 2);
        compact_lines.push(Line::from(header_spans));

        if lines.is_empty() {
            compact_lines.push(Line::from(vec![Span::raw("")]));
        } else {
            compact_lines.extend(lines);
        }

        compact_lines.push(Line::from(vec![Span::raw("")]));
        compact_lines
    }

    fn build_card_header(
        role: &Role,
        timestamp: Option<&str>,
        markers: &[String],
        card_width: usize,
        theme: &Theme,
    ) -> Line<'static> {
        let border_style = Self::message_border_style(theme, role);
        let role_style = Self::role_style(theme, role).add_modifier(Modifier::BOLD);
        let meta_style = Style::default().fg(theme.placeholder);
        let tool_style = Style::default()
            .fg(theme.tool_output)
            .add_modifier(Modifier::BOLD);

        let mut spans: Vec<Span<'static>> = Vec::new();
        spans.push(Span::styled("┌", border_style));
        let mut consumed = 1usize;

        spans.push(Span::styled(" ", border_style));
        consumed += 1;

        let (emoji, title) = role_label_parts(role);
        let label_text = format!("{emoji} {title}");
        let label_width = UnicodeWidthStr::width(label_text.as_str());
        spans.push(Span::styled(label_text, role_style));
        consumed += label_width;

        if let Some(ts) = timestamp {
            let separator = " — ";
            let separator_width = UnicodeWidthStr::width(separator);
            let ts_width = UnicodeWidthStr::width(ts);
            if consumed + separator_width + ts_width + 1 < card_width {
                spans.push(Span::styled(separator.to_string(), border_style));
                consumed += separator_width;
                spans.push(Span::styled(ts.to_string(), meta_style));
                consumed += ts_width;
            }
        }

        for marker in markers {
            let spacer_width = 2usize;
            let marker_width = UnicodeWidthStr::width(marker.as_str());
            if consumed + spacer_width + marker_width + 1 > card_width {
                break;
            }
            spans.push(Span::styled("  ".to_string(), border_style));
            spans.push(Span::styled(marker.clone(), tool_style));
            consumed += spacer_width + marker_width;
        }

        if consumed + 1 < card_width {
            spans.push(Span::styled(" ", border_style));
            consumed += 1;
        }

        let remaining = card_width.saturating_sub(consumed + 1);
        if remaining > 0 {
            spans.push(Span::styled("─".repeat(remaining), border_style));
        }

        spans.push(Span::styled("┐", border_style));
        Line::from(spans)
    }

    fn build_card_footer(card_width: usize, theme: &Theme, role: &Role) -> Line<'static> {
        let border_style = Self::message_border_style(theme, role);
        let mut spans = Vec::new();
        spans.push(Span::styled("└", border_style));
        let horizontal = card_width.saturating_sub(2);
        if horizontal > 0 {
            spans.push(Span::styled("─".repeat(horizontal), border_style));
        }
        spans.push(Span::styled("┘", border_style));
        Line::from(spans)
    }

    fn wrap_card_body_line(
        line: Line<'static>,
        inner_width: usize,
        theme: &Theme,
        role: &Role,
    ) -> Line<'static> {
        let border_style = Self::message_border_style(theme, role);
        let mut spans = Vec::new();
        spans.push(Span::styled("│ ", border_style));

        let content_width = Self::line_display_width(&line).min(inner_width);
        let mut body_spans = line.spans;
        spans.append(&mut body_spans);

        if content_width < inner_width {
            spans.push(Span::styled(
                " ".repeat(inner_width - content_width),
                Style::default(),
            ));
        }

        spans.push(Span::styled(" │", border_style));
        Line::from(spans)
    }

    fn build_card_header_plain(
        role: &Role,
        timestamp: Option<&str>,
        markers: &[String],
        card_width: usize,
    ) -> String {
        let mut result = String::new();
        let mut consumed = 0usize;

        result.push('┌');
        consumed += 1;

        result.push(' ');
        consumed += 1;

        let (emoji, title) = role_label_parts(role);
        let label_text = format!("{emoji} {title}");
        result.push_str(&label_text);
        consumed += UnicodeWidthStr::width(label_text.as_str());

        if let Some(ts) = timestamp {
            let separator = " — ";
            let separator_width = UnicodeWidthStr::width(separator);
            let ts_width = UnicodeWidthStr::width(ts);
            if consumed + separator_width + ts_width + 1 < card_width {
                result.push_str(separator);
                result.push_str(ts);
                consumed += separator_width + ts_width;
            }
        }

        for marker in markers {
            let spacer_width = 2usize;
            let marker_width = UnicodeWidthStr::width(marker.as_str());
            if consumed + spacer_width + marker_width + 1 >= card_width {
                break;
            }
            result.push_str("  ");
            result.push_str(marker);
            consumed += spacer_width + marker_width;
        }

        let remaining = card_width.saturating_sub(consumed + 1);
        if remaining > 0 {
            result.push_str(&"─".repeat(remaining));
        }

        result.push('┐');
        result
    }

    fn wrap_card_body_line_plain(line: &str, inner_width: usize) -> String {
        let mut result = String::from("│ ");
        result.push_str(line);
        let content_width = UnicodeWidthStr::width(line);
        if content_width < inner_width {
            result.push_str(&" ".repeat(inner_width - content_width));
        }
        result.push_str(" │");
        result
    }

    fn build_card_footer_plain(card_width: usize) -> String {
        let mut result = String::new();
        result.push('└');
        let horizontal = card_width.saturating_sub(2);
        if horizontal > 0 {
            result.push_str(&"─".repeat(horizontal));
        }
        result.push('┘');
        result
    }

    fn line_display_width(line: &Line<'_>) -> usize {
        line.spans
            .iter()
            .map(|span| UnicodeWidthStr::width(span.content.as_ref()))
            .sum()
    }

    pub fn apply_chat_scrollback_trim(&mut self, removed: usize, remaining: usize) {
        if removed == 0 {
            self.chat_line_offset = 0;
            self.chat_cursor.0 = self.chat_cursor.0.min(remaining.saturating_sub(1));
            return;
        }

        self.chat_line_offset = removed;
        self.auto_scroll.scroll = self.auto_scroll.scroll.saturating_sub(removed);
        self.auto_scroll.content_len = remaining;

        if let Some((row, _)) = &mut self.visual_start {
            if *row < removed {
                self.visual_start = None;
            } else {
                *row -= removed;
            }
        }

        if let Some((row, _)) = &mut self.visual_end {
            if *row < removed {
                self.visual_end = None;
            } else {
                *row -= removed;
            }
        }

        self.chat_cursor.0 = self.chat_cursor.0.saturating_sub(removed);
        if remaining == 0 {
            self.chat_cursor = (0, 0);
        } else if self.chat_cursor.0 >= remaining {
            self.chat_cursor.0 = remaining - 1;
        }

        let max_scroll = remaining.saturating_sub(self.viewport_height);
        if self.auto_scroll.scroll > max_scroll {
            self.auto_scroll.scroll = max_scroll;
        }

        if self.auto_scroll.stick_to_bottom {
            self.auto_scroll.on_viewport(self.viewport_height);
        }

        self.update_new_message_alert_after_scroll();
    }

    pub fn set_theme(&mut self, theme: Theme) {
        self.theme = theme;
        self.message_line_cache.clear();
    }

    pub fn switch_theme(&mut self, theme_name: &str) -> Result<()> {
        if let Some(theme) = owlen_core::theme::get_theme(theme_name) {
            self.theme = theme;
            self.message_line_cache.clear();
            // Save theme to config
            self.controller.config_mut().ui.theme = theme_name.to_string();
            if let Err(err) = config::save_config(&self.controller.config()) {
                self.error = Some(format!("Failed to save theme config: {}", err));
            } else {
                self.status = format!("Switched to theme: {}", theme_name);
            }
            Ok(())
        } else {
            self.error = Some(format!("Theme '{}' not found", theme_name));
            Err(anyhow::anyhow!("Theme '{}' not found", theme_name))
        }
    }

    fn focus_sequence(&self) -> Vec<FocusedPanel> {
        let mut order = Vec::new();
        if !self.file_panel_collapsed {
            order.push(FocusedPanel::Files);
        }
        order.push(FocusedPanel::Chat);
        if self.should_show_code_view() {
            order.push(FocusedPanel::Code);
        }
        if self.current_thinking.is_some() {
            order.push(FocusedPanel::Thinking);
        }
        order.push(FocusedPanel::Input);
        order
    }

    fn ensure_focus_valid(&mut self) {
        let order = self.focus_sequence();
        if order.is_empty() {
            self.focused_panel = FocusedPanel::Chat;
        } else if !order.contains(&self.focused_panel) {
            self.focused_panel = order[0];
        }
        if let FocusedPanel::Thinking = self.focused_panel {
            // Ensure the vertical split favours thinking panel if chat collapsed entirely
            if let Some(tab) = self.workspace_mut().active_tab_mut() {
                tab.root.ensure_ratio_bounds();
            }
        }
    }

    pub fn cycle_focus_forward(&mut self) {
        let order = self.focus_sequence();
        if order.is_empty() {
            self.focused_panel = FocusedPanel::Chat;
            return;
        }
        if !order.contains(&self.focused_panel) {
            self.focused_panel = order[0];
        }
        let current_index = order
            .iter()
            .position(|panel| *panel == self.focused_panel)
            .unwrap_or(0);
        let next_index = (current_index + 1) % order.len();
        self.focused_panel = order[next_index];
    }

    pub fn cycle_focus_backward(&mut self) {
        let order = self.focus_sequence();
        if order.is_empty() {
            self.focused_panel = FocusedPanel::Chat;
            return;
        }
        if !order.contains(&self.focused_panel) {
            self.focused_panel = order[0];
        }
        let current_index = order
            .iter()
            .position(|panel| *panel == self.focused_panel)
            .unwrap_or(0);
        let prev_index = if current_index == 0 {
            order.len().saturating_sub(1)
        } else {
            current_index - 1
        };
        self.focused_panel = order[prev_index];
    }

    pub fn focus_panel(&mut self, target: FocusedPanel) -> bool {
        match target {
            FocusedPanel::Files => {
                if self.file_panel_collapsed {
                    self.expand_file_panel();
                    if self.file_panel_collapsed {
                        return false;
                    }
                }
            }
            FocusedPanel::Code => {
                if !self.should_show_code_view() {
                    return false;
                }
            }
            FocusedPanel::Thinking => {
                if self.current_thinking.is_none() && self.agent_actions.is_none() {
                    return false;
                }
            }
            FocusedPanel::Chat | FocusedPanel::Input => {}
        }

        let order = self.focus_sequence();
        if !order.contains(&target) {
            return false;
        }

        self.focused_panel = target;
        self.ensure_focus_valid();
        true
    }

    /// Sync textarea content to input buffer
    fn sync_textarea_to_buffer(&mut self) {
        let text = self.textarea.lines().join("\n");
        self.input_buffer_mut().set_text(text.clone());
        let _ = self.apply_app_event(AppEvent::Composer(ComposerEvent::DraftChanged {
            content: text,
        }));
    }

    /// Sync input buffer content to textarea
    fn sync_buffer_to_textarea(&mut self) {
        let text = self.input_buffer().text().to_string();
        let lines: Vec<String> = text.lines().map(|s| s.to_string()).collect();
        self.textarea = TextArea::new(lines);
        configure_textarea_defaults(&mut self.textarea);
        let _ = self.apply_app_event(AppEvent::Composer(ComposerEvent::DraftChanged {
            content: text,
        }));
    }

    fn apply_app_event(&mut self, event: AppEvent) -> Vec<AppEffect> {
        mvu::update(&mut self.mvu_model, event)
    }

    async fn handle_app_effects(&mut self, effects: Vec<AppEffect>) -> Result<()> {
        let mut pending = effects;
        while let Some(effect) = pending.pop() {
            match effect {
                AppEffect::SetStatus(message) => {
                    self.error = Some(message.clone());
                    self.status = message;
                }
                AppEffect::RequestSubmit => {
                    let outcome = self.process_composer_submission().await?;
                    let mut follow_up = self.apply_app_event(AppEvent::Composer(
                        ComposerEvent::SubmissionHandled { result: outcome },
                    ));
                    pending.append(&mut follow_up);

                    match outcome {
                        SubmissionOutcome::MessageSent | SubmissionOutcome::CommandExecuted => {
                            self.sync_buffer_to_textarea();
                            self.set_input_mode(InputMode::Normal);
                        }
                        SubmissionOutcome::Failed => {
                            self.sync_buffer_to_textarea();
                        }
                    }
                }
                AppEffect::ResolveToolConsent { request_id, scope } => {
                    let resolution = self.controller.resolve_tool_consent(request_id, scope)?;
                    self.apply_tool_consent_resolution(resolution)?;
                }
            }
        }

        Ok(())
    }

    async fn process_composer_submission(&mut self) -> Result<SubmissionOutcome> {
        match self.process_slash_submission().await? {
            SlashOutcome::NotCommand => {
                self.send_user_message_and_request_response();
                Ok(SubmissionOutcome::MessageSent)
            }
            SlashOutcome::Consumed => Ok(SubmissionOutcome::CommandExecuted),
            SlashOutcome::Error => Ok(SubmissionOutcome::Failed),
        }
    }

    async fn try_execute_command(&mut self, key: &KeyEvent) -> Result<bool> {
        if let Some(command) = self.keymap.resolve(self.mode, key) {
            if self.execute_command(command).await? {
                return Ok(true);
            }
        }
        Ok(false)
    }

    async fn execute_command(&mut self, command: AppCommand) -> Result<bool> {
        match command {
            AppCommand::OpenModelPicker(filter) => {
                self.pending_key = None;
                if !matches!(self.mode, InputMode::Normal) {
                    return Ok(false);
                }
                if let Err(err) = self.show_model_picker(filter).await {
                    self.error = Some(err.to_string());
                }
                Ok(true)
            }
            AppCommand::OpenCommandPalette | AppCommand::EnterCommandMode => {
                self.pending_key = None;
                if !matches!(
                    self.mode,
                    InputMode::Normal | InputMode::Editing | InputMode::Command
                ) {
                    return Ok(false);
                }
                self.set_input_mode(InputMode::Command);
                self.command_palette.clear();
                self.command_palette.ensure_suggestions();
                self.status = ":".to_string();
                self.error = None;
                Ok(true)
            }
            AppCommand::CycleFocusForward => {
                self.pending_key = None;
                if !matches!(self.mode, InputMode::Normal) {
                    return Ok(false);
                }
                self.cycle_focus_forward();
                self.status = format!("Focus: {}", Self::panel_label(self.focused_panel));
                self.error = None;
                Ok(true)
            }
            AppCommand::CycleFocusBackward => {
                self.pending_key = None;
                if !matches!(self.mode, InputMode::Normal) {
                    return Ok(false);
                }
                self.cycle_focus_backward();
                self.status = format!("Focus: {}", Self::panel_label(self.focused_panel));
                self.error = None;
                Ok(true)
            }
            AppCommand::FocusPanel(target) => {
                self.pending_key = None;
                if !matches!(self.mode, InputMode::Normal) {
                    return Ok(false);
                }
                if self.focus_panel(target) {
                    self.status = match target {
                        FocusedPanel::Input => "Focus: Input — press i to edit".to_string(),
                        _ => format!("Focus: {}", Self::panel_label(target)),
                    };
                    self.error = None;
                } else {
                    self.status = match target {
                        FocusedPanel::Files => {
                            if self.is_code_mode() {
                                "Files panel is collapsed — use :files to reopen".to_string()
                            } else {
                                "Unable to focus Files panel".to_string()
                            }
                        }
                        FocusedPanel::Code => "Open a file to focus the code workspace".to_string(),
                        FocusedPanel::Thinking => "No reasoning panel to focus yet".to_string(),
                        FocusedPanel::Chat => "Unable to focus Chat panel".to_string(),
                        FocusedPanel::Input => "Unable to focus Input panel".to_string(),
                    };
                }
                Ok(true)
            }
            AppCommand::ComposerSubmit => {
                if !matches!(self.mode, InputMode::Editing) {
                    return Ok(false);
                }
                self.pending_key = None;
                self.sync_textarea_to_buffer();
                let effects = self.apply_app_event(AppEvent::Composer(ComposerEvent::Submit));
                self.handle_app_effects(effects).await?;
                Ok(true)
            }
            AppCommand::ToggleDebugLog => {
                self.pending_key = None;
                self.toggle_debug_log_panel();
                Ok(true)
            }
            AppCommand::SetKeymap(profile) => {
                self.pending_key = None;
                if profile.is_builtin() {
                    self.switch_keymap_profile(profile).await?;
                }
                Ok(true)
            }
        }
    }

    fn panel_label(panel: FocusedPanel) -> &'static str {
        match panel {
            FocusedPanel::Files => "Files",
            FocusedPanel::Chat => "Chat",
            FocusedPanel::Thinking => "Thinking",
            FocusedPanel::Input => "Input",
            FocusedPanel::Code => "Code",
        }
    }

    pub fn adjust_vertical_split(&mut self, delta: f32) {
        if let Some(tab) = self.workspace_mut().active_tab_mut() {
            tab.root.nudge_ratio(delta);
        }
    }

    async fn process_slash_submission(&mut self) -> Result<SlashOutcome> {
        let raw = self.controller.input_buffer().text().to_string();
        if raw.trim().is_empty() {
            return Ok(SlashOutcome::NotCommand);
        }

        match slash::parse(&raw) {
            Ok(None) => Ok(SlashOutcome::NotCommand),
            Ok(Some(command)) => match self.execute_slash_command(command).await {
                Ok(()) => {
                    self.input_buffer_mut().push_history_entry(raw.clone());
                    self.controller.input_buffer_mut().clear();
                    Ok(SlashOutcome::Consumed)
                }
                Err(err) => {
                    self.error = Some(err.to_string());
                    self.status = "Slash command failed".to_string();
                    self.controller.input_buffer_mut().set_text(raw);
                    Ok(SlashOutcome::Error)
                }
            },
            Err(err) => {
                self.error = Some(err.to_string());
                self.status = "Slash command error".to_string();
                Ok(SlashOutcome::Error)
            }
        }
    }

    async fn execute_slash_command(&mut self, command: SlashCommand) -> Result<()> {
        match command {
            SlashCommand::Summarize { count } => {
                let prompt = if let Some(count) = count {
                    format!(
                        "Summarize the last {count} messages in this conversation. Highlight key decisions, open questions, and follow-up tasks."
                    )
                } else {
                    "Summarize the conversation so far, calling out major decisions, blockers, and immediate next steps.".to_string()
                };
                self.status = "Summarizing conversation...".to_string();
                self.dispatch_user_prompt(prompt);
            }
            SlashCommand::Explain { snippet } => {
                let prompt = format!(
                    "Explain the following code snippet. Cover what it does and call out any potential issues or improvements:\n```\n{}\n```",
                    snippet
                );
                self.status = "Explaining snippet...".to_string();
                self.dispatch_user_prompt(prompt);
            }
            SlashCommand::Refactor { path } => {
                let trimmed = path.trim();
                if trimmed.is_empty() {
                    anyhow::bail!("usage: /refactor <relative/path/to/file>");
                }
                let source = self.controller.read_file(trimmed).await?;
                let prompt = format!(
                    "Refactor the file `{}`. Provide specific improvements for readability, safety, and maintainability. Include updated code where relevant.\n\n```text\n{}\n```",
                    trimmed, source
                );
                self.status = format!("Refactor review for {trimmed}...");
                self.dispatch_user_prompt(prompt);
            }
            SlashCommand::TestPlan => {
                let prompt = "Generate a comprehensive test plan for this repository. Outline critical test suites, coverage gaps, and prioritized steps to reach confident automation.".to_string();
                self.status = "Generating test plan...".to_string();
                self.dispatch_user_prompt(prompt);
            }
            SlashCommand::Compact => {
                let prompt = "Compress our conversation history to its essentials. Summarize previous exchanges, preserve critical context, and indicate what state can be safely forgotten.".to_string();
                self.status = "Compacting conversation...".to_string();
                self.dispatch_user_prompt(prompt);
            }
            SlashCommand::McpTool { server, tool } => {
                self.status = format!("Running MCP tool {server}::{tool}...");
                let response = self
                    .controller
                    .call_mcp_tool(&server, &tool, json!({}))
                    .await
                    .map_err(|err| {
                        anyhow!("Failed to invoke MCP tool {}::{}: {}", server, tool, err)
                    })?;

                let content = Self::format_mcp_slash_message(&server, &tool, &response);
                self.controller
                    .conversation_mut()
                    .push_system_message(content);
                self.auto_scroll.stick_to_bottom = true;
                self.new_message_alert = true;

                if response.success {
                    self.status = format!("MCP {server}::{tool} result added to chat.");
                    self.push_toast(ToastLevel::Info, format!("MCP {server}::{tool} completed."));
                } else {
                    self.status = format!("MCP {server}::{tool} reported an error (see chat).");
                    self.push_toast(
                        ToastLevel::Warning,
                        format!("MCP {server}::{tool} reported an error."),
                    );
                }
                self.error = None;
            }
        }
        Ok(())
    }

    fn schedule_oauth_poll(
        &self,
        server: String,
        authorization: DeviceAuthorization,
        delay: Duration,
    ) {
        let sender = self.session_tx.clone();
        tokio::spawn(async move {
            tokio::time::sleep(delay).await;
            let _ = sender.send(SessionEvent::OAuthPoll {
                server,
                authorization,
            });
        });
    }

    async fn start_oauth_login(&mut self, server: &str) -> Result<()> {
        if self.oauth_flows.contains_key(server) {
            self.error = Some(format!("OAuth flow for '{server}' is already in progress."));
            return Ok(());
        }

        let authorization = match self.controller.start_oauth_device_flow(server).await {
            Ok(auth) => auth,
            Err(err) => {
                self.error = Some(format!("Failed to start OAuth for '{server}': {err}"));
                return Ok(());
            }
        };

        self.oauth_flows
            .insert(server.to_string(), authorization.clone());

        let link = authorization
            .verification_uri_complete
            .clone()
            .unwrap_or_else(|| authorization.verification_uri.clone());
        let status = format!(
            "Authorize '{server}' via {} (code {}).",
            link, authorization.user_code
        );
        self.status = status;
        self.error = None;

        let mut message = format!(
            "OAuth authorization required for `{server}`.\nVisit:\n{}\nEnter code: `{}`",
            link, authorization.user_code
        );
        if let Some(hint) = &authorization.message
            && !hint.trim().is_empty()
        {
            message.push_str("\n\n");
            message.push_str(hint);
        }
        if authorization.expires_at > Utc::now() {
            message.push_str(&format!(
                "\n\nThis code expires at {}.",
                authorization
                    .expires_at
                    .to_rfc3339_opts(chrono::SecondsFormat::Secs, true)
            ));
        }

        self.controller
            .conversation_mut()
            .push_system_message(message);
        self.auto_scroll.stick_to_bottom = true;
        self.notify_new_activity();

        self.push_toast(
            ToastLevel::Warning,
            format!("Authorize {server}: code {}", authorization.user_code),
        );

        let delay = authorization.interval;
        self.schedule_oauth_poll(server.to_string(), authorization.clone(), delay);
        Ok(())
    }

    fn dispatch_user_prompt(&mut self, prompt: String) {
        if prompt.trim().is_empty() {
            self.error = Some("Slash command generated an empty request".to_string());
            return;
        }

        self.controller.conversation_mut().push_user_message(prompt);
        self.auto_scroll.stick_to_bottom = true;
        self.pending_llm_request = true;
        self.set_system_status(String::new());
        self.error = None;
    }

    fn set_code_view_content(
        &mut self,
        display_path: impl Into<String>,
        absolute: Option<PathBuf>,
        content: String,
    ) {
        let mut lines: Vec<String> = content.lines().map(|line| line.to_string()).collect();
        if content.ends_with('\n') {
            lines.push(String::new());
        }
        let display = display_path.into();
        self.code_workspace
            .set_active_contents(absolute, Some(display), lines);
        self.ensure_focus_valid();
    }

    fn repo_layout_slug(&self) -> String {
        self.file_tree()
            .repo_name()
            .chars()
            .map(|ch| {
                if ch.is_ascii_alphanumeric() {
                    ch.to_ascii_lowercase()
                } else {
                    '-'
                }
            })
            .collect()
    }

    fn workspace_layout_path(&self) -> Result<PathBuf> {
        let base = data_local_dir().or_else(config_dir).ok_or_else(|| {
            anyhow!("Unable to determine configuration directory for layout persistence")
        })?;

        let mut dir = base.join("owlen").join("layouts");
        fs::create_dir_all(&dir)
            .with_context(|| format!("Failed to create layout directory at {}", dir.display()))?;

        let mut hasher = DefaultHasher::new();
        self.file_tree().root().to_string_lossy().hash(&mut hasher);
        let slug = self.repo_layout_slug();
        dir.push(format!("{}-{}.toml", slug, hasher.finish()));
        Ok(dir)
    }

    fn persist_workspace_layout(&mut self) {
        if self.code_workspace.tabs().is_empty() {
            return;
        }

        let snapshot = self.code_workspace.snapshot();
        match (self.workspace_layout_path(), toml::to_string(&snapshot)) {
            (Ok(path), Ok(serialized)) => {
                if let Err(err) = fs::write(&path, serialized) {
                    eprintln!(
                        "Warning: failed to write workspace layout {}: {}",
                        path.display(),
                        err
                    );
                }
            }
            (Err(err), _) => {
                eprintln!("Warning: unable to determine layout path: {err}");
            }
            (_, Err(err)) => {
                eprintln!("Warning: failed to serialize workspace layout: {err}");
            }
        }
    }

    fn restore_pane_from_request(&mut self, request: PaneRestoreRequest) -> Result<()> {
        let Some(absolute) = request.absolute_path.as_ref() else {
            return Ok(());
        };

        let content = fs::read_to_string(absolute)
            .with_context(|| format!("Failed to read restored file {}", absolute.display()))?;
        let mut lines: Vec<String> = content.lines().map(|line| line.to_string()).collect();
        if content.ends_with('\n') {
            lines.push(String::new());
        }

        let display = request.display_path.clone().or_else(|| {
            diff_paths(absolute, self.file_tree().root()).map(|path| {
                if path.as_os_str().is_empty() {
                    ".".to_string()
                } else {
                    path.to_string_lossy().into_owned()
                }
            })
        });

        if self.code_workspace.set_pane_contents(
            request.pane_id,
            Some(absolute.clone()),
            display,
            lines,
        ) {
            self.code_workspace
                .restore_scroll(request.pane_id, &request.scroll);
        }

        Ok(())
    }

    async fn restore_workspace_layout(&mut self) -> Result<bool> {
        let path = match self.workspace_layout_path() {
            Ok(path) => path,
            Err(_) => return Ok(false),
        };

        if !path.exists() {
            return Ok(false);
        }

        let contents = fs::read_to_string(&path)
            .with_context(|| format!("Failed to read workspace layout {}", path.display()))?;
        let snapshot: WorkspaceSnapshot = toml::from_str(&contents)
            .with_context(|| format!("Failed to parse workspace layout {}", path.display()))?;

        let requests = self.code_workspace.apply_snapshot(snapshot);
        let mut restored_any = false;
        for request in requests {
            if let Err(err) = self.restore_pane_from_request(request) {
                eprintln!("Warning: failed to restore pane from layout: {err}");
            } else {
                restored_any = true;
            }
        }

        if restored_any {
            self.focused_panel = FocusedPanel::Code;
            self.ensure_focus_valid();
            self.status = "Workspace layout restored".to_string();
        }

        Ok(restored_any)
    }

    fn direction_label(direction: PaneDirection) -> &'static str {
        match direction {
            PaneDirection::Left => "←",
            PaneDirection::Right => "→",
            PaneDirection::Up => "↑",
            PaneDirection::Down => "↓",
        }
    }

    fn handle_workspace_focus_move(&mut self, direction: PaneDirection) {
        self.pending_focus_chord = None;
        if self.code_workspace.move_focus(direction) {
            self.focused_panel = FocusedPanel::Code;
            self.ensure_focus_valid();
            if let Some(share) = self.code_workspace.active_share() {
                self.status = format!(
                    "Focused pane {} · {:.0}% share",
                    Self::direction_label(direction),
                    (share * 100.0).round()
                );
            } else {
                self.status = format!("Focused pane {}", Self::direction_label(direction));
            }
            self.error = None;
            self.persist_workspace_layout();
        } else {
            self.status = "No pane in that direction".to_string();
        }
    }

    fn handle_workspace_resize(&mut self, direction: PaneDirection) {
        self.pending_focus_chord = None;
        let now = Instant::now();
        let is_double = self
            .last_resize_tap
            .map(|(prev_dir, instant)| {
                prev_dir == direction && now.duration_since(instant) <= RESIZE_DOUBLE_TAP_WINDOW
            })
            .unwrap_or(false);

        let share_opt = if is_double {
            if self.last_snap_direction != Some(direction) {
                self.resize_snap_index = 0;
            }
            let snap = RESIZE_SNAP_VALUES[self.resize_snap_index % RESIZE_SNAP_VALUES.len()];
            let result = self.code_workspace.snap_active_share(direction, snap);
            if result.is_some() {
                self.last_snap_direction = Some(direction);
                self.resize_snap_index = (self.resize_snap_index + 1) % RESIZE_SNAP_VALUES.len();
            }
            result
        } else {
            self.last_snap_direction = None;
            self.resize_snap_index = 0;
            self.code_workspace
                .resize_active_step(direction, RESIZE_STEP)
        };

        match share_opt {
            Some(share) => {
                if is_double {
                    self.status = format!(
                        "Pane snapped {} · {:.0}% share",
                        Self::direction_label(direction),
                        (share * 100.0).round()
                    );
                } else {
                    self.status = format!(
                        "Pane resized {} · {:.0}% share",
                        Self::direction_label(direction),
                        (share * 100.0).round()
                    );
                }
                self.focused_panel = FocusedPanel::Code;
                self.ensure_focus_valid();
                self.error = None;
                self.persist_workspace_layout();
                if is_double {
                    self.last_resize_tap = None;
                } else {
                    self.last_resize_tap = Some((direction, now));
                }
            }
            None => {
                self.status = "No adjacent split to resize".to_string();
                self.last_resize_tap = Some((direction, now));
                self.last_snap_direction = None;
            }
        }
    }

    fn prepare_code_view_target(&mut self, disposition: FileOpenDisposition) -> bool {
        match disposition {
            FileOpenDisposition::Primary => true,
            FileOpenDisposition::SplitHorizontal => self
                .code_workspace
                .split_active(SplitAxis::Horizontal)
                .is_some(),
            FileOpenDisposition::SplitVertical => self
                .code_workspace
                .split_active(SplitAxis::Vertical)
                .is_some(),
            FileOpenDisposition::Tab => {
                self.code_workspace.open_new_tab();
                true
            }
        }
    }

    fn display_label_for_absolute(&self, absolute: &Path) -> String {
        let root = self.file_tree().root();
        if let Some(relative) = diff_paths(absolute, root) {
            let rel_str = relative.to_string_lossy().into_owned();
            if rel_str.is_empty() {
                ".".to_string()
            } else {
                rel_str
            }
        } else {
            absolute.to_string_lossy().into_owned()
        }
    }

    fn buffer_label(&self, display: Option<&str>, absolute: Option<&Path>) -> String {
        if let Some(display) = display {
            let trimmed = display.trim();
            if trimmed.is_empty() {
                "untitled buffer".to_string()
            } else {
                trimmed.to_string()
            }
        } else if let Some(absolute) = absolute {
            self.display_label_for_absolute(absolute)
        } else {
            "untitled buffer".to_string()
        }
    }

    async fn save_active_code_buffer(
        &mut self,
        path_arg: Option<String>,
        force: bool,
    ) -> Result<SaveStatus> {
        let pane_snapshot = if let Some(pane) = self.code_workspace.active_pane() {
            (
                pane.lines.join("\n"),
                pane.absolute_path().map(Path::to_path_buf),
                pane.display_path().map(|s| s.to_string()),
                pane.is_dirty,
            )
        } else {
            self.status = "No active file to save".to_string();
            self.error = Some("Open a file before saving".to_string());
            return Ok(SaveStatus::Failed);
        };

        let (content, existing_absolute, existing_display, was_dirty) = pane_snapshot;

        if !was_dirty && path_arg.is_none() && !force {
            let label =
                self.buffer_label(existing_display.as_deref(), existing_absolute.as_deref());
            self.status = format!("No changes to write ({label})");
            self.error = None;
            return Ok(SaveStatus::NoChanges);
        }

        let (request_path, target_absolute, target_display) = if let Some(path_arg) = path_arg {
            let trimmed = path_arg.trim();
            if trimmed.is_empty() {
                self.status = "Save aborted: empty path".to_string();
                self.error = Some("Provide a path to save this buffer".to_string());
                return Ok(SaveStatus::Failed);
            }

            let provided_path = PathBuf::from(trimmed);
            let absolute = self.absolute_tree_path(&provided_path);
            let request = if provided_path.is_absolute() {
                provided_path.to_string_lossy().into_owned()
            } else {
                trimmed.to_string()
            };
            let display = self.display_label_for_absolute(&absolute);
            (request, absolute, display)
        } else if let Some(display) = existing_display.clone() {
            let path = PathBuf::from(&display);
            let absolute = if path.is_absolute() {
                path.clone()
            } else {
                self.absolute_tree_path(&path)
            };
            let display_label = self.display_label_for_absolute(&absolute);
            (display, absolute, display_label)
        } else if let Some(absolute) = existing_absolute.clone() {
            let request = absolute.to_string_lossy().into_owned();
            let display = self.display_label_for_absolute(&absolute);
            (request, absolute, display)
        } else {
            self.status = "No path associated with buffer".to_string();
            self.error = Some("Use :w <path> to save this buffer".to_string());
            return Ok(SaveStatus::Failed);
        };

        match self.controller.write_file(&request_path, &content).await {
            Ok(()) => {
                if let Some(tab) = self.code_workspace.active_tab_mut() {
                    if let Some(pane) = tab.active_pane_mut() {
                        pane.update_paths(
                            Some(target_absolute.clone()),
                            Some(target_display.clone()),
                        );
                        pane.is_dirty = false;
                        pane.is_staged = false;
                    }
                    tab.update_title_from_active();
                }

                match self.file_tree_mut().refresh() {
                    Ok(()) => {
                        self.file_tree_mut().reveal(&target_absolute);
                        self.ensure_focus_valid();
                    }
                    Err(err) => {
                        self.error = Some(format!(
                            "Saved {} but failed to refresh tree: {}",
                            target_display, err
                        ));
                    }
                }

                self.status = format!("Wrote {}", target_display);
                if self.error.is_none() {
                    self.set_system_status(format!("Saved {}", target_display));
                }
                Ok(SaveStatus::Saved)
            }
            Err(err) => {
                self.error = Some(format!("Failed to save {}: {}", target_display, err));
                self.status = format!("Failed to save {}", target_display);
                Ok(SaveStatus::Failed)
            }
        }
    }

    fn close_active_code_buffer(&mut self, force: bool) -> bool {
        let snapshot = if let Some(pane) = self.code_workspace.active_pane() {
            (
                pane.display_path().map(|s| s.to_string()),
                pane.absolute_path().map(Path::to_path_buf),
                pane.is_dirty,
            )
        } else {
            self.status = "No active file to close".to_string();
            self.error = Some("Open a file before closing it".to_string());
            return false;
        };

        let (display_path, absolute_path, is_dirty) = snapshot;

        if is_dirty && !force {
            let label = self.buffer_label(display_path.as_deref(), absolute_path.as_deref());
            self.status = format!("Unsaved changes in {label} — use :w to save or :q! to discard");
            self.error = Some(format!("Unsaved changes detected in {}", label));
            return false;
        }

        let label = self.buffer_label(display_path.as_deref(), absolute_path.as_deref());
        self.close_code_view();
        self.status = format!("Closed {}", label);
        self.error = None;
        self.set_system_status(String::new());
        true
    }

    fn split_active_pane(&mut self, axis: SplitAxis) {
        let Some(snapshot) = self.code_workspace.active_pane().cloned() else {
            self.status = "No pane to split".to_string();
            return;
        };

        if self.code_workspace.split_active(axis).is_some() {
            let lines = snapshot.lines.clone();
            let absolute = snapshot.absolute_path.clone();
            let display = snapshot.display_path.clone();
            self.code_workspace
                .set_active_contents(absolute, display, lines);
            if let Some(pane) = self.code_workspace.active_pane_mut() {
                pane.is_dirty = snapshot.is_dirty;
                pane.is_staged = snapshot.is_staged;
                pane.viewport_height = snapshot.viewport_height;
                pane.scroll = snapshot.scroll.clone();
            }
            self.focused_panel = FocusedPanel::Code;
            self.ensure_focus_valid();
            self.status = match axis {
                SplitAxis::Horizontal => "Split pane horizontally".to_string(),
                SplitAxis::Vertical => "Split pane vertically".to_string(),
            };
            self.error = None;
            self.persist_workspace_layout();
        } else {
            self.status = "Unable to split pane".to_string();
            self.error = Some("Unable to split pane".to_string());
        }
    }

    fn close_code_view(&mut self) {
        self.code_workspace.clear_active_pane();
        if matches!(self.focused_panel, FocusedPanel::Code) {
            self.focused_panel = FocusedPanel::Chat;
        }
        self.ensure_focus_valid();
        self.persist_workspace_layout();
    }

    fn absolute_tree_path(&self, path: &Path) -> PathBuf {
        if path.as_os_str().is_empty() {
            self.file_tree().root().to_path_buf()
        } else if path.is_absolute() {
            path.to_path_buf()
        } else {
            self.file_tree().root().join(path)
        }
    }

    fn relative_tree_display(&self, path: &Path) -> String {
        if path.as_os_str().is_empty() {
            ".".to_string()
        } else {
            path.to_string_lossy().into_owned()
        }
    }

    async fn open_selected_file_from_tree(
        &mut self,
        disposition: FileOpenDisposition,
    ) -> Result<()> {
        if !self.is_code_mode() {
            self.status = "Switch to code mode to open files".to_string();
            self.error = None;
            return Ok(());
        }

        let selected_opt = {
            let tree = self.file_tree();
            tree.selected_node().cloned()
        };

        let Some(selected) = selected_opt else {
            self.status = "No file selected".to_string();
            return Ok(());
        };

        if selected.is_dir {
            let was_expanded = selected.is_expanded;
            self.file_tree_mut().toggle_expand();
            let label = self.relative_tree_display(&selected.path);
            self.status = if was_expanded {
                format!("Collapsed {}", label)
            } else {
                format!("Expanded {}", label)
            };
            return Ok(());
        }

        if selected.path.as_os_str().is_empty() {
            return Ok(());
        }

        let relative_display = self.relative_tree_display(&selected.path);
        let absolute_path = self.absolute_tree_path(&selected.path);
        let request_path = if selected.path.is_absolute() {
            selected.path.to_string_lossy().into_owned()
        } else {
            relative_display.clone()
        };

        match self.controller.read_file_with_tools(&request_path).await {
            Ok(content) => {
                let prepared = self.prepare_code_view_target(disposition);
                self.set_code_view_content(
                    relative_display.clone(),
                    Some(absolute_path.clone()),
                    content,
                );
                self.focused_panel = FocusedPanel::Code;
                self.ensure_focus_valid();
                self.file_tree_mut().reveal(&absolute_path);
                if !prepared {
                    self.error =
                        Some("Unable to create requested split; opened in active pane".to_string());
                } else {
                    self.error = None;
                }
                self.status = match (disposition, prepared) {
                    (FileOpenDisposition::Primary, _) => format!("Opened {}", relative_display),
                    (FileOpenDisposition::SplitHorizontal, true) => {
                        format!("Opened {} in horizontal split", relative_display)
                    }
                    (FileOpenDisposition::SplitVertical, true) => {
                        format!("Opened {} in vertical split", relative_display)
                    }
                    (FileOpenDisposition::Tab, true) => {
                        format!("Opened {} in new tab", relative_display)
                    }
                    (FileOpenDisposition::SplitHorizontal, false)
                    | (FileOpenDisposition::SplitVertical, false) => {
                        format!("Opened {} (split unavailable)", relative_display)
                    }
                    (FileOpenDisposition::Tab, false) => {
                        format!("Opened {} (tab unavailable)", relative_display)
                    }
                };
                self.set_system_status(format!("Viewing {}", relative_display));
                self.persist_workspace_layout();
            }
            Err(err) => {
                self.error = Some(format!("Failed to open {}: {}", relative_display, err));
            }
        }

        Ok(())
    }

    fn copy_selected_path(&mut self, relative: bool) {
        let selected_opt = {
            let tree = self.file_tree();
            tree.selected_node().cloned()
        };

        let Some(selected) = selected_opt else {
            self.status = "No file selected".to_string();
            return;
        };

        let path_string = if relative {
            self.relative_tree_display(&selected.path)
        } else {
            let abs = self.absolute_tree_path(&selected.path);
            abs.to_string_lossy().into_owned()
        };

        self.clipboard = path_string.clone();
        self.status = if relative {
            format!("Copied relative path: {}", path_string)
        } else {
            format!("Copied path: {}", path_string)
        };
        self.error = None;
    }

    fn selected_file_node(&self) -> Option<FileNode> {
        let tree = self.file_tree();
        tree.selected_node().cloned()
    }

    fn mutate_file_filter<F>(&mut self, mutate: F)
    where
        F: FnOnce(&mut String),
    {
        let mut query = {
            let tree = self.file_tree();
            tree.filter_query().to_string()
        };

        mutate(&mut query);

        let query_is_empty = query.is_empty();

        {
            let tree = self.file_tree_mut();
            if query_is_empty {
                tree.set_filter_mode(FileFilterMode::Glob);
            }
            tree.set_filter_query(query.clone());
        }

        if query_is_empty {
            self.status = "Filter cleared".to_string();
        } else {
            let mode = match self.file_tree().filter_mode() {
                FileFilterMode::Glob => "glob",
                FileFilterMode::Fuzzy => "fuzzy",
            };
            self.status = format!("Filter ({mode}): {}", query);
        }
        self.error = None;
    }

    fn backspace_file_filter(&mut self) {
        self.mutate_file_filter(|query| {
            query.pop();
        });
    }

    fn clear_file_filter(&mut self) {
        self.mutate_file_filter(|query| {
            query.clear();
        });
    }

    fn append_file_filter_char(&mut self, ch: char) {
        self.mutate_file_filter(|query| {
            query.push(ch);
        });
    }

    fn toggle_hidden_files(&mut self) {
        match self.file_tree_mut().toggle_hidden() {
            Ok(()) => {
                let show_hidden = self.file_tree().show_hidden();
                self.status = if show_hidden {
                    "Hidden files visible".to_string()
                } else {
                    "Hidden files hidden".to_string()
                };
                self.error = None;
            }
            Err(err) => {
                self.error = Some(format!("Failed to toggle hidden files: {}", err));
            }
        }
    }

    fn create_file_from_command(&mut self, path: &str) -> Result<String> {
        if !self.is_code_mode() {
            return Err(anyhow!("File creation is only available in code mode"));
        }
        let trimmed = path.trim();
        if trimmed.is_empty() {
            return Err(anyhow!("File path cannot be empty"));
        }

        let relative = PathBuf::from(trimmed);
        validate_relative_path(&relative, true)?;

        let file_name = relative
            .file_name()
            .ok_or_else(|| anyhow!("File path must include a file name"))?
            .to_string_lossy()
            .into_owned();

        let base = relative
            .parent()
            .filter(|parent| !parent.as_os_str().is_empty())
            .map(|parent| parent.to_path_buf())
            .unwrap_or_else(PathBuf::new);

        let prompt = FileActionPrompt::new(FileActionKind::CreateFile { base }, file_name);
        let message = self.perform_file_action(prompt)?;
        self.expand_file_panel();
        Ok(message)
    }

    pub fn file_panel_prompt_text(&self) -> Option<(String, bool)> {
        self.pending_file_action.as_ref().map(|prompt| {
            (
                self.describe_file_action_prompt(prompt),
                prompt.is_destructive(),
            )
        })
    }

    fn describe_file_action_prompt(&self, prompt: &FileActionPrompt) -> String {
        let buffer_display = if prompt.buffer.trim().is_empty() {
            "<name>".to_string()
        } else {
            prompt.buffer.clone()
        };

        let base_message = match &prompt.kind {
            FileActionKind::CreateFile { base } => {
                let base_display = self.relative_tree_display(base);
                format!("Create file in {} ▸ {}", base_display, buffer_display)
            }
            FileActionKind::CreateFolder { base } => {
                let base_display = self.relative_tree_display(base);
                format!("Create folder in {} ▸ {}", base_display, buffer_display)
            }
            FileActionKind::Rename { original } => {
                let current_display = self.relative_tree_display(original);
                format!("Rename {} → {}", current_display, buffer_display)
            }
            FileActionKind::Move { original } => {
                let current_display = self.relative_tree_display(original);
                format!("Move {} → {}", current_display, buffer_display)
            }
            FileActionKind::Delete { target, .. } => {
                let target_display = self.relative_tree_display(target);
                format!(
                    "Delete {} — type filename to confirm ▸ {}",
                    target_display, buffer_display
                )
            }
        };

        format!("{base_message}  (Enter to apply · Esc to cancel)")
    }

    fn begin_file_action(&mut self, kind: FileActionKind, initial: impl Into<String>) {
        if !self.is_code_mode() {
            self.status = "Switch to code mode to manage files".to_string();
            self.error = None;
            return;
        }
        let prompt = FileActionPrompt::new(kind, initial);
        self.status = self.describe_file_action_prompt(&prompt);
        self.error = None;
        self.pending_file_action = Some(prompt);
    }

    fn refresh_file_action_status(&mut self) {
        if let Some(prompt) = self.pending_file_action.as_ref() {
            self.status = self.describe_file_action_prompt(prompt);
        }
    }

    fn cancel_file_action(&mut self) {
        self.pending_file_action = None;
        self.status = "File action cancelled".to_string();
        self.error = None;
    }

    fn handle_file_action_prompt(&mut self, key: &crossterm::event::KeyEvent) -> Result<bool> {
        use crossterm::event::{KeyCode, KeyModifiers};

        if self.pending_file_action.is_none() {
            return Ok(false);
        }

        let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);
        let alt = key.modifiers.contains(KeyModifiers::ALT);

        match key.code {
            KeyCode::Enter if !ctrl && !alt => {
                self.apply_pending_file_action()?;
                return Ok(true);
            }
            KeyCode::Esc if !ctrl && !alt => {
                self.cancel_file_action();
                return Ok(true);
            }
            KeyCode::Backspace if !ctrl && !alt => {
                if let Some(prompt) = self.pending_file_action.as_mut() {
                    prompt.pop_char();
                }
                self.refresh_file_action_status();
                self.error = None;
                return Ok(true);
            }
            KeyCode::Char(c) if !ctrl && !alt => {
                if let Some(prompt) = self.pending_file_action.as_mut() {
                    prompt.push_char(c);
                }
                self.refresh_file_action_status();
                self.error = None;
                return Ok(true);
            }
            KeyCode::Tab if !ctrl && !alt => {
                if let Some(prompt) = self.pending_file_action.as_mut() {
                    prompt.push_char('\t');
                }
                self.refresh_file_action_status();
                self.error = None;
                return Ok(true);
            }
            KeyCode::Delete if !ctrl && !alt => {
                if let Some(prompt) = self.pending_file_action.as_mut() {
                    prompt.set_buffer(String::new());
                }
                self.refresh_file_action_status();
                self.error = None;
                return Ok(true);
            }
            _ => {}
        }

        Ok(false)
    }

    fn apply_pending_file_action(&mut self) -> Result<()> {
        let Some(prompt) = self.pending_file_action.take() else {
            return Ok(());
        };
        let cloned_prompt = prompt.clone();
        match self.perform_file_action(prompt) {
            Ok(message) => {
                self.status = message;
                self.error = None;
                Ok(())
            }
            Err(err) => {
                self.pending_file_action = Some(cloned_prompt);
                self.error = Some(err.to_string());
                Err(err)
            }
        }
    }

    async fn launch_external_editor(&mut self) -> Result<()> {
        if !self.is_code_mode() {
            self.status = "Switch to code mode to launch the external editor".to_string();
            self.error = None;
            return Ok(());
        }
        let Some(selected) = self.selected_file_node() else {
            self.status = "No file selected".to_string();
            return Ok(());
        };
        let relative = selected.path.clone();
        let absolute = self.absolute_tree_path(&relative);
        let editor = env::var("EDITOR")
            .or_else(|_| env::var("VISUAL"))
            .unwrap_or_else(|_| "vi".to_string());

        self.status = format!("Launching {} {}", editor, absolute.display());
        self.error = None;

        let editor_cmd = editor.clone();
        let path_arg = absolute.clone();

        let raw_mode_disabled = disable_raw_mode().is_ok();
        let join_result =
            task::spawn_blocking(move || Command::new(&editor_cmd).arg(&path_arg).status()).await;
        if raw_mode_disabled {
            let _ = enable_raw_mode();
        }
        let join_result = join_result.context("Editor task failed to join")?;

        match join_result {
            Ok(status) => {
                if status.success() {
                    self.status = format!(
                        "Closed {} for {}",
                        editor,
                        self.relative_tree_display(&relative)
                    );
                    self.error = None;
                } else {
                    let code = status
                        .code()
                        .map(|c| c.to_string())
                        .unwrap_or_else(|| "signal".to_string());
                    self.error = Some(format!("{} exited with status {}", editor, code));
                }
            }
            Err(err) => {
                self.error = Some(format!("Failed to launch {}: {}", editor, err));
            }
        }

        match self.file_tree_mut().refresh() {
            Ok(()) => {
                self.file_tree_mut().reveal(&absolute);
                self.ensure_focus_valid();
            }
            Err(err) => {
                self.error = Some(format!("Failed to refresh file tree: {}", err));
            }
        }

        Ok(())
    }

    fn perform_file_action(&mut self, prompt: FileActionPrompt) -> Result<String> {
        if !self.is_code_mode() {
            return Err(anyhow!("File actions are only available in code mode"));
        }
        match prompt.kind {
            FileActionKind::CreateFile { base } => {
                let name = prompt.buffer.trim();
                if name.is_empty() {
                    return Err(anyhow!("File name cannot be empty"));
                }
                let name_path = PathBuf::from(name);
                validate_relative_path(&name_path, true)?;
                let relative = if base.as_os_str().is_empty() {
                    name_path
                } else {
                    base.join(name_path)
                };
                let absolute = self.absolute_tree_path(&relative);
                if absolute.exists() {
                    return Err(anyhow!("{} already exists", absolute.display()));
                }
                if let Some(parent) = absolute.parent() {
                    fs::create_dir_all(parent).with_context(|| {
                        format!(
                            "Failed to create parent directories for {}",
                            absolute.display()
                        )
                    })?;
                }
                OpenOptions::new()
                    .create_new(true)
                    .write(true)
                    .open(&absolute)
                    .with_context(|| format!("Failed to create {}", absolute.display()))?;
                self.file_tree_mut()
                    .refresh()
                    .context("Failed to refresh file tree")?;
                self.file_tree_mut().reveal(&absolute);
                self.ensure_focus_valid();
                Ok(format!(
                    "Created file {}",
                    self.relative_tree_display(&relative)
                ))
            }
            FileActionKind::CreateFolder { base } => {
                let name = prompt.buffer.trim();
                if name.is_empty() {
                    return Err(anyhow!("Folder name cannot be empty"));
                }
                let name_path = PathBuf::from(name);
                validate_relative_path(&name_path, true)?;
                let relative = if base.as_os_str().is_empty() {
                    name_path
                } else {
                    base.join(name_path)
                };
                let absolute = self.absolute_tree_path(&relative);
                if absolute.exists() {
                    return Err(anyhow!("{} already exists", absolute.display()));
                }
                fs::create_dir_all(&absolute)
                    .with_context(|| format!("Failed to create {}", absolute.display()))?;
                self.file_tree_mut()
                    .refresh()
                    .context("Failed to refresh file tree")?;
                self.file_tree_mut().reveal(&absolute);
                self.ensure_focus_valid();
                Ok(format!(
                    "Created folder {}",
                    self.relative_tree_display(&relative)
                ))
            }
            FileActionKind::Rename { original } => {
                if original.as_os_str().is_empty() {
                    return Err(anyhow!("Cannot rename workspace root"));
                }
                let name = prompt.buffer.trim();
                if name.is_empty() {
                    return Err(anyhow!("New name cannot be empty"));
                }
                validate_relative_path(Path::new(name), false)?;
                let new_relative = original
                    .parent()
                    .map(|parent| {
                        if parent.as_os_str().is_empty() {
                            PathBuf::from(name)
                        } else {
                            parent.join(name)
                        }
                    })
                    .unwrap_or_else(|| PathBuf::from(name));
                let source_abs = self.absolute_tree_path(&original);
                let target_abs = self.absolute_tree_path(&new_relative);
                if target_abs.exists() {
                    return Err(anyhow!("{} already exists", target_abs.display()));
                }
                fs::rename(&source_abs, &target_abs).with_context(|| {
                    format!(
                        "Failed to rename {} to {}",
                        source_abs.display(),
                        target_abs.display()
                    )
                })?;
                self.file_tree_mut()
                    .refresh()
                    .context("Failed to refresh file tree")?;
                self.file_tree_mut().reveal(&target_abs);
                self.ensure_focus_valid();
                Ok(format!(
                    "Renamed {} to {}",
                    self.relative_tree_display(&original),
                    self.relative_tree_display(&new_relative)
                ))
            }
            FileActionKind::Move { original } => {
                if original.as_os_str().is_empty() {
                    return Err(anyhow!("Cannot move workspace root"));
                }
                let target = prompt.buffer.trim();
                if target.is_empty() {
                    return Err(anyhow!("Target path cannot be empty"));
                }
                let target_relative = PathBuf::from(target);
                validate_relative_path(&target_relative, true)?;
                let source_abs = self.absolute_tree_path(&original);
                let target_abs = self.absolute_tree_path(&target_relative);
                if target_abs.exists() {
                    return Err(anyhow!("{} already exists", target_abs.display()));
                }
                if let Some(parent) = target_abs.parent() {
                    fs::create_dir_all(parent).with_context(|| {
                        format!(
                            "Failed to create parent directories for {}",
                            target_abs.display()
                        )
                    })?;
                }
                fs::rename(&source_abs, &target_abs).with_context(|| {
                    format!(
                        "Failed to move {} to {}",
                        source_abs.display(),
                        target_abs.display()
                    )
                })?;
                self.file_tree_mut()
                    .refresh()
                    .context("Failed to refresh file tree")?;
                self.file_tree_mut().reveal(&target_abs);
                self.ensure_focus_valid();
                Ok(format!(
                    "Moved {} to {}",
                    self.relative_tree_display(&original),
                    self.relative_tree_display(&target_relative)
                ))
            }
            FileActionKind::Delete { target, confirm } => {
                if target.as_os_str().is_empty() {
                    return Err(anyhow!("Cannot delete workspace root"));
                }
                let typed = prompt.buffer.trim();
                if typed != confirm {
                    return Err(anyhow!("Type '{}' to confirm deletion", confirm));
                }
                let absolute = self.absolute_tree_path(&target);
                if absolute.is_dir() {
                    fs::remove_dir_all(&absolute).with_context(|| {
                        format!("Failed to delete directory {}", absolute.display())
                    })?;
                } else if absolute.exists() {
                    fs::remove_file(&absolute)
                        .with_context(|| format!("Failed to delete file {}", absolute.display()))?;
                } else {
                    return Err(anyhow!("{} does not exist", absolute.display()));
                }
                self.file_tree_mut()
                    .refresh()
                    .context("Failed to refresh file tree")?;
                if let Some(parent) = target.parent() {
                    let parent_abs = if parent.as_os_str().is_empty() {
                        self.file_tree().root().to_path_buf()
                    } else {
                        self.absolute_tree_path(parent)
                    };
                    self.file_tree_mut().reveal(&parent_abs);
                }
                self.ensure_focus_valid();
                Ok(format!("Deleted {}", self.relative_tree_display(&target)))
            }
        }
    }

    fn reveal_path_in_file_tree(&mut self, path: &Path) {
        if !self.is_code_mode() {
            self.status = "Switch to code mode to reveal files".to_string();
            self.error = None;
            return;
        }
        let absolute = self.absolute_tree_path(path);
        self.expand_file_panel();
        self.file_tree_mut().reveal(&absolute);
        self.focused_panel = FocusedPanel::Files;
        self.ensure_focus_valid();
        let display = absolute
            .strip_prefix(self.file_tree().root())
            .map(|p| p.to_string_lossy().into_owned())
            .unwrap_or_else(|_| absolute.to_string_lossy().into_owned());
        self.status = format!("Revealed {}", display);
    }

    fn reveal_active_file(&mut self) {
        let path_opt = self.code_workspace.active_pane().and_then(|pane| {
            pane.absolute_path().map(Path::to_path_buf).or_else(|| {
                pane.display_path()
                    .map(|display| PathBuf::from(display.to_string()))
            })
        });

        match path_opt {
            Some(path) => self.reveal_path_in_file_tree(&path),
            None => {
                self.status = "No active file to reveal".to_string();
            }
        }
    }

    async fn handle_file_panel_key(&mut self, key: &crossterm::event::KeyEvent) -> Result<bool> {
        use crossterm::event::{KeyCode, KeyModifiers};

        if !self.is_code_mode() {
            return Ok(false);
        }

        let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);
        let shift = key.modifiers.contains(KeyModifiers::SHIFT);
        let alt = key.modifiers.contains(KeyModifiers::ALT);
        let no_modifiers = key.modifiers.is_empty();

        if self.pending_file_action.is_some() && self.handle_file_action_prompt(key)? {
            return Ok(true);
        }

        match key.code {
            KeyCode::Enter => {
                self.open_selected_file_from_tree(FileOpenDisposition::Primary)
                    .await?;
                return Ok(true);
            }
            KeyCode::Char('o') if no_modifiers => {
                self.open_selected_file_from_tree(FileOpenDisposition::SplitHorizontal)
                    .await?;
                return Ok(true);
            }
            KeyCode::Char('O') if shift && !ctrl && !alt => {
                self.open_selected_file_from_tree(FileOpenDisposition::SplitVertical)
                    .await?;
                return Ok(true);
            }
            KeyCode::Char('t') if no_modifiers => {
                self.open_selected_file_from_tree(FileOpenDisposition::Tab)
                    .await?;
                return Ok(true);
            }
            KeyCode::Char('y') if no_modifiers => {
                self.copy_selected_path(false);
                return Ok(true);
            }
            KeyCode::Char('Y') if shift && !ctrl && !alt => {
                self.copy_selected_path(true);
                return Ok(true);
            }
            KeyCode::Char('A') if shift && !ctrl && !alt => {
                if let Some(selected) = self.selected_file_node() {
                    let base = if selected.is_dir {
                        selected.path.clone()
                    } else {
                        selected
                            .path
                            .parent()
                            .map(|p| p.to_path_buf())
                            .unwrap_or_else(PathBuf::new)
                    };
                    self.begin_file_action(FileActionKind::CreateFolder { base }, String::new());
                } else {
                    self.status = "No file selected".to_string();
                }
                return Ok(true);
            }
            KeyCode::Char('r') if no_modifiers => {
                if let Some(selected) = self.selected_file_node() {
                    if selected.path.as_os_str().is_empty() {
                        self.error = Some("Cannot rename workspace root".to_string());
                    } else {
                        let initial = selected
                            .path
                            .file_name()
                            .map(|s| s.to_string_lossy().into_owned())
                            .unwrap_or_default();
                        self.begin_file_action(
                            FileActionKind::Rename {
                                original: selected.path.clone(),
                            },
                            initial,
                        );
                    }
                } else {
                    self.status = "No file selected".to_string();
                }
                return Ok(true);
            }
            KeyCode::Char('m') if no_modifiers => {
                if let Some(selected) = self.selected_file_node() {
                    if selected.path.as_os_str().is_empty() {
                        self.error = Some("Cannot move workspace root".to_string());
                    } else {
                        let initial = self.relative_tree_display(&selected.path);
                        self.begin_file_action(
                            FileActionKind::Move {
                                original: selected.path.clone(),
                            },
                            initial,
                        );
                    }
                } else {
                    self.status = "No file selected".to_string();
                }
                return Ok(true);
            }
            KeyCode::Char('d') if no_modifiers => {
                if let Some(selected) = self.selected_file_node() {
                    if selected.path.as_os_str().is_empty() {
                        self.error = Some("Cannot delete workspace root".to_string());
                    } else {
                        let confirm = selected
                            .path
                            .file_name()
                            .map(|s| s.to_string_lossy().into_owned())
                            .unwrap_or_default();
                        if confirm.is_empty() {
                            self.error =
                                Some("Unable to determine file name for confirmation".to_string());
                        } else {
                            self.begin_file_action(
                                FileActionKind::Delete {
                                    target: selected.path.clone(),
                                    confirm,
                                },
                                String::new(),
                            );
                        }
                    }
                } else {
                    self.status = "No file selected".to_string();
                }
                return Ok(true);
            }
            KeyCode::Char('.') if no_modifiers => {
                self.launch_external_editor().await?;
                return Ok(true);
            }
            KeyCode::Char('/') if !ctrl && !alt => {
                if self.file_tree().filter_query().is_empty() {
                    {
                        let tree = self.file_tree_mut();
                        tree.set_filter_mode(FileFilterMode::Fuzzy);
                        tree.set_filter_query(String::new());
                    }
                    let mode = match self.file_tree().filter_mode() {
                        FileFilterMode::Glob => "glob",
                        FileFilterMode::Fuzzy => "fuzzy",
                    };
                    self.status = format!("Filter ({mode}): type to search");
                    self.error = None;
                } else {
                    self.append_file_filter_char('/');
                }
                return Ok(true);
            }
            KeyCode::Backspace if !ctrl && !alt => {
                self.backspace_file_filter();
                return Ok(true);
            }
            KeyCode::Esc if !ctrl && !alt => {
                if !self.file_tree().filter_query().is_empty() {
                    self.clear_file_filter();
                    return Ok(true);
                }
            }
            KeyCode::Char(' ') if !ctrl && !alt => {
                self.file_tree_mut().toggle_expand();
                return Ok(true);
            }
            KeyCode::Char(c) if !ctrl && !alt => {
                let reserved = matches!(
                    (c, shift),
                    ('o', false)
                        | ('O', true)
                        | ('t', false)
                        | ('y', false)
                        | ('Y', true)
                        | ('g', _)
                        | ('d', _)
                        | ('m', _)
                        | ('A', true)
                        | ('r', _)
                        | ('/', _)
                        | ('.', _)
                );
                if !reserved && !c.is_control() {
                    self.append_file_filter_char(c);
                    return Ok(true);
                }
            }
            _ => {}
        }

        Ok(false)
    }

    fn handle_resize(&mut self, width: u16, _height: u16) {
        let approx_content_width = usize::from(width.saturating_sub(6));
        self.content_width = approx_content_width.max(1);
        self.auto_scroll.stick_to_bottom = true;
        self.thinking_scroll.stick_to_bottom = true;
        if let Some(scroll) = self.code_view_scroll_mut() {
            scroll.stick_to_bottom = false;
        }
    }

    pub async fn initialize_models(&mut self) -> Result<()> {
        let config_model_name = self.controller.config().general.default_model.clone();
        let config_model_provider = self.controller.config().general.default_provider.clone();

        let (all_models, errors, scope_status) = self.collect_models_from_all_providers().await;
        self.models = all_models;
        self.provider_scope_status = scope_status;
        self.model_details_cache.clear();
        self.model_info_panel.clear();
        self.show_model_info = false;

        self.recompute_available_providers();

        if self.available_providers.is_empty() {
            self.available_providers.push("ollama_local".to_string());
        }

        if !config_model_provider.is_empty() {
            self.selected_provider = Self::canonical_provider_id(&config_model_provider);
        } else {
            self.selected_provider = self.available_providers[0].clone();
        }

        self.expanded_provider = Some(self.selected_provider.clone());
        self.update_selected_provider_index();
        self.sync_selected_model_index().await;

        // Ensure the default model is set in the controller and config (async)
        self.controller.ensure_default_model(&self.models).await;

        let current_model_name = self.controller.selected_model().to_string();
        let current_model_provider = self.controller.config().general.default_provider.clone();

        if config_model_name.as_deref() != Some(&current_model_name)
            || config_model_provider != current_model_provider
        {
            if let Err(err) = config::save_config(&self.controller.config()) {
                self.error = Some(format!("Failed to save config: {err}"));
            } else {
                self.error = None;
            }
        }

        if !errors.is_empty() {
            self.error = Some(errors.join("; "));
        }

        self.update_command_palette_catalog();

        Ok(())
    }

    pub async fn handle_event(&mut self, event: Event) -> Result<AppState> {
        use crossterm::event::{KeyCode, KeyModifiers};

        if let Some(last) = self.last_ctrl_c
            && last.elapsed() > DOUBLE_CTRL_C_WINDOW
        {
            self.last_ctrl_c = None;
        }

        match event {
            Event::Tick => {
                self.poll_repo_search();
                self.poll_symbol_search();
                self.poll_debug_log_updates();
                self.prune_toasts();
                // Future: update streaming timers
            }
            Event::Resize(width, height) => {
                self.handle_resize(width, height);
            }
            Event::Paste(text) => {
                // Handle paste events - insert text directly without triggering sends
                if matches!(self.mode, InputMode::Editing | InputMode::Visual)
                    && self.textarea.insert_str(&text)
                {
                    self.sync_textarea_to_buffer();
                }
                // Ignore paste events in other modes
            }
            Event::Mouse(mouse) => {
                return self.handle_mouse_event(mouse);
            }
            Event::Key(key) => {
                let is_ctrl_c = matches!(
                    (key.code, key.modifiers),
                    (KeyCode::Char('c'), m) if m.contains(KeyModifiers::CONTROL)
                );

                if !is_ctrl_c {
                    self.last_ctrl_c = None;
                }

                // Handle consent dialog first (highest priority)
                if let Some(consent_state) = &self.pending_consent {
                    let scope = match key.code {
                        KeyCode::Char('1') => Some(ConsentScope::Once),
                        KeyCode::Char('2') => Some(ConsentScope::Session),
                        KeyCode::Char('3') => Some(ConsentScope::Permanent),
                        KeyCode::Char('4') | KeyCode::Esc => Some(ConsentScope::Denied),
                        _ => None,
                    };

                    if let Some(scope) = scope {
                        let request_id = consent_state.request_id;
                        let effects =
                            self.apply_app_event(AppEvent::ToolPermission { request_id, scope });
                        self.handle_app_effects(effects).await?;
                    }
                    return Ok(AppState::Running);
                }

                if self.try_execute_command(&key).await? {
                    return Ok(AppState::Running);
                }

                if matches!(key.code, KeyCode::F(1)) {
                    if matches!(self.mode, InputMode::Help) {
                        self.set_input_mode(InputMode::Normal);
                        self.help_tab_index = 0;
                        self.reset_status();
                    } else {
                        self.set_input_mode(InputMode::Help);
                        self.status = "Help".to_string();
                        self.error = None;
                    }
                    return Ok(AppState::Running);
                }

                let is_question_mark = matches!(
                    (key.code, key.modifiers),
                    (KeyCode::Char('?'), KeyModifiers::NONE | KeyModifiers::SHIFT)
                );
                let is_reveal_active = key.modifiers.contains(KeyModifiers::CONTROL)
                    && key.modifiers.contains(KeyModifiers::SHIFT)
                    && matches!(key.code, KeyCode::Char('r') | KeyCode::Char('R'));
                let is_repo_search = key.modifiers.contains(KeyModifiers::CONTROL)
                    && key.modifiers.contains(KeyModifiers::SHIFT)
                    && matches!(key.code, KeyCode::Char('f') | KeyCode::Char('F'));
                let is_symbol_search_key = key.modifiers.contains(KeyModifiers::CONTROL)
                    && key.modifiers.contains(KeyModifiers::SHIFT)
                    && matches!(key.code, KeyCode::Char('p') | KeyCode::Char('P'));
                let is_resize_left = key.modifiers.contains(KeyModifiers::CONTROL)
                    && matches!(
                        key.code,
                        KeyCode::Left | KeyCode::Char('h') | KeyCode::Char('H')
                    );
                let is_resize_right = key.modifiers.contains(KeyModifiers::CONTROL)
                    && matches!(
                        key.code,
                        KeyCode::Right | KeyCode::Char('l') | KeyCode::Char('L')
                    );
                let is_resize_up = key.modifiers.contains(KeyModifiers::CONTROL)
                    && matches!(
                        key.code,
                        KeyCode::Up | KeyCode::Char('k') | KeyCode::Char('K')
                    );
                let is_resize_down = key.modifiers.contains(KeyModifiers::CONTROL)
                    && matches!(
                        key.code,
                        KeyCode::Down | KeyCode::Char('j') | KeyCode::Char('J')
                    );

                if is_reveal_active && matches!(self.mode, InputMode::Normal) {
                    self.reveal_active_file();
                    return Ok(AppState::Running);
                }

                if is_question_mark && matches!(self.mode, InputMode::Normal) {
                    self.set_input_mode(InputMode::Help);
                    self.status = "Help".to_string();
                    return Ok(AppState::Running);
                }

                if is_repo_search && matches!(self.mode, InputMode::Normal) {
                    self.set_input_mode(InputMode::RepoSearch);
                    if self.repo_search.query_input().is_empty() {
                        *self.repo_search.status_mut() =
                            Some("Type a pattern · Enter runs ripgrep".to_string());
                    }
                    self.status = "Repo search active".to_string();
                    return Ok(AppState::Running);
                }

                if (is_resize_left || is_resize_right)
                    && matches!(self.mode, InputMode::Normal)
                    && !self.is_file_panel_collapsed()
                {
                    let current = self.file_panel_width();
                    let delta: i16 = if is_resize_left { -2 } else { 2 };
                    let candidate = current.saturating_add_signed(delta);
                    let adjusted = self.set_file_panel_width(candidate);
                    if adjusted != current {
                        self.status = format!("Files panel width: {} cols", adjusted);
                        self.error = None;
                    } else {
                        self.status = "Files panel width unchanged".to_string();
                    }
                    return Ok(AppState::Running);
                }

                if (is_resize_up || is_resize_down) && matches!(self.mode, InputMode::Normal) {
                    let delta = if is_resize_up { -0.05 } else { 0.05 };
                    self.adjust_vertical_split(delta);
                    self.status = format!(
                        "Vertical split adjusted ({})",
                        if delta.is_sign_positive() {
                            "down"
                        } else {
                            "up"
                        }
                    );
                    self.error = None;
                    return Ok(AppState::Running);
                }

                if is_symbol_search_key && matches!(self.mode, InputMode::Normal) {
                    self.set_input_mode(InputMode::SymbolSearch);
                    self.symbol_search.clear_query();
                    self.status = "Symbol search active".to_string();
                    self.start_symbol_search().await?;
                    return Ok(AppState::Running);
                }

                match self.mode {
                    InputMode::Normal => {
                        // Handle multi-key sequences first
                        if self.show_model_info
                            && matches!(
                                (key.code, key.modifiers),
                                (KeyCode::Esc, KeyModifiers::NONE)
                            )
                        {
                            self.set_model_info_visible(false);
                            self.status = "Closed model info panel".to_string();
                            return Ok(AppState::Running);
                        }

                        if let Some(started) = self.pending_focus_chord {
                            if started.elapsed() > FOCUS_CHORD_TIMEOUT {
                                self.pending_focus_chord = None;
                            } else if key.modifiers.is_empty() {
                                let direction = match key.code {
                                    KeyCode::Left => Some(PaneDirection::Left),
                                    KeyCode::Right => Some(PaneDirection::Right),
                                    KeyCode::Up => Some(PaneDirection::Up),
                                    KeyCode::Down => Some(PaneDirection::Down),
                                    _ => None,
                                };
                                if let Some(direction) = direction {
                                    self.handle_workspace_focus_move(direction);
                                    return Ok(AppState::Running);
                                } else {
                                    self.pending_focus_chord = None;
                                }
                            } else {
                                self.pending_focus_chord = None;
                            }
                        }

                        if let Some(pending) = self.pending_key {
                            self.pending_key = None;
                            match (pending, key.code) {
                                ('g', KeyCode::Char('g')) => {
                                    self.jump_to_top();
                                }
                                ('g', KeyCode::Char('T')) | ('g', KeyCode::Char('t')) => {
                                    self.expand_file_panel();
                                    self.focused_panel = FocusedPanel::Files;
                                    self.status = "Files panel focused".to_string();
                                }
                                ('g', KeyCode::Char('h')) | ('g', KeyCode::Char('H')) => {
                                    if matches!(self.focused_panel, FocusedPanel::Files) {
                                        self.toggle_hidden_files();
                                    } else {
                                        self.status =
                                            "Toggle hidden files from the Files panel".to_string();
                                    }
                                }
                                ('W', KeyCode::Char('s')) | ('W', KeyCode::Char('S')) => {
                                    self.split_active_pane(SplitAxis::Horizontal);
                                }
                                ('W', KeyCode::Char('v')) | ('W', KeyCode::Char('V')) => {
                                    self.split_active_pane(SplitAxis::Vertical);
                                }
                                ('d', KeyCode::Char('d')) => {
                                    // Clear input buffer
                                    self.input_buffer_mut().clear();
                                    self.textarea = TextArea::default();
                                    configure_textarea_defaults(&mut self.textarea);
                                    self.status = "Input buffer cleared".to_string();
                                }
                                _ => {
                                    // Invalid sequence, ignore
                                }
                            }
                            return Ok(AppState::Running);
                        }

                        if matches!(self.focused_panel, FocusedPanel::Files)
                            && self.handle_file_panel_key(&key).await?
                        {
                            return Ok(AppState::Running);
                        }

                        if key.modifiers.contains(KeyModifiers::CONTROL)
                            && matches!(key.code, KeyCode::Char('w') | KeyCode::Char('W'))
                        {
                            self.pending_key = Some('W');
                            self.status =
                                "Split layout: press s for horizontal, v for vertical".to_string();
                            return Ok(AppState::Running);
                        }

                        match (key.code, key.modifiers) {
                            (KeyCode::Left, modifiers) if modifiers.contains(KeyModifiers::ALT) => {
                                self.handle_workspace_resize(PaneDirection::Left);
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Right, modifiers)
                                if modifiers.contains(KeyModifiers::ALT) =>
                            {
                                self.handle_workspace_resize(PaneDirection::Right);
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Up, modifiers) if modifiers.contains(KeyModifiers::ALT) => {
                                self.handle_workspace_resize(PaneDirection::Up);
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Down, modifiers) if modifiers.contains(KeyModifiers::ALT) => {
                                self.handle_workspace_resize(PaneDirection::Down);
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('c'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL) =>
                            {
                                if self.cancel_active_generation()? {
                                    self.last_ctrl_c = None;
                                    return Ok(AppState::Running);
                                }

                                let now = Instant::now();
                                if let Some(last) = self.last_ctrl_c
                                    && now.duration_since(last) <= DOUBLE_CTRL_C_WINDOW
                                {
                                    self.status = "Exiting…".to_string();
                                    self.set_system_status(String::new());
                                    self.last_ctrl_c = None;
                                    return Ok(AppState::Quit);
                                }

                                self.last_ctrl_c = Some(now);
                                self.status = "Press Ctrl+C again to quit".to_string();
                                self.set_system_status(
                                    "Press Ctrl+C again to quit OWLEN".to_string(),
                                );
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('j'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL) =>
                            {
                                if self.show_model_info && self.model_info_viewport_height > 0 {
                                    self.model_info_panel
                                        .scroll_down(self.model_info_viewport_height);
                                }
                            }
                            (KeyCode::Char('k'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL) =>
                            {
                                self.pending_focus_chord = Some(Instant::now());
                                self.status = "Pane focus pending — use ←/→/↑/↓".to_string();
                                if self.show_model_info && self.model_info_viewport_height > 0 {
                                    self.model_info_panel.scroll_up();
                                }
                                return Ok(AppState::Running);
                            }
                            // Mode switches
                            (KeyCode::Char('v'), KeyModifiers::NONE) => {
                                if matches!(self.focused_panel, FocusedPanel::Code) {
                                    self.status =
                                        "Code view is read-only; yank text with :open and copy manually."
                                            .to_string();
                                    return Ok(AppState::Running);
                                }
                                self.set_input_mode(InputMode::Visual);

                                match self.focused_panel {
                                    FocusedPanel::Input => {
                                        // Sync buffer to textarea before entering visual mode
                                        self.sync_buffer_to_textarea();
                                        // Set a visible selection style
                                        let selection_style = Style::default()
                                            .bg(self.theme.selection_bg)
                                            .fg(self.theme.selection_fg);
                                        self.textarea.set_selection_style(selection_style);
                                        // Start visual selection at current cursor position
                                        self.textarea.start_selection();
                                        self.visual_start = Some(self.textarea.cursor());
                                    }
                                    FocusedPanel::Chat | FocusedPanel::Thinking => {
                                        // For scrollable panels, start selection at cursor position
                                        let cursor =
                                            if matches!(self.focused_panel, FocusedPanel::Chat) {
                                                self.chat_cursor
                                            } else {
                                                self.thinking_cursor
                                            };
                                        self.visual_start = Some(cursor);
                                        self.visual_end = Some(cursor);
                                    }
                                    FocusedPanel::Files => {}
                                    FocusedPanel::Code => {}
                                }
                                self.status =
                                    "-- VISUAL -- (move with j/k, yank with y)".to_string();
                            }
                            (KeyCode::Char(':'), KeyModifiers::NONE) => {
                                self.set_input_mode(InputMode::Command);
                                self.command_palette.clear();
                                self.command_palette.ensure_suggestions();
                                self.status = ":".to_string();
                            }
                            (KeyCode::Char('p'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL) =>
                            {
                                self.set_input_mode(InputMode::Command);
                                self.command_palette.clear();
                                self.command_palette.ensure_suggestions();
                                self.status = ":".to_string();
                                return Ok(AppState::Running);
                            }
                            // Enter editing mode
                            (KeyCode::Enter, KeyModifiers::NONE)
                            | (KeyCode::Char('i'), KeyModifiers::NONE) => {
                                self.set_input_mode(InputMode::Editing);
                                self.sync_buffer_to_textarea();
                            }
                            (KeyCode::Char('a'), KeyModifiers::NONE) => {
                                // Append - move right and enter insert mode
                                self.set_input_mode(InputMode::Editing);
                                self.sync_buffer_to_textarea();
                                self.textarea.move_cursor(tui_textarea::CursorMove::Forward);
                            }
                            (KeyCode::Char('A'), KeyModifiers::SHIFT) => {
                                // Append at end of line
                                self.set_input_mode(InputMode::Editing);
                                self.sync_buffer_to_textarea();
                                self.textarea.move_cursor(tui_textarea::CursorMove::End);
                            }
                            (KeyCode::Char('I'), KeyModifiers::SHIFT) => {
                                // Insert at start of line
                                self.set_input_mode(InputMode::Editing);
                                self.sync_buffer_to_textarea();
                                self.textarea.move_cursor(tui_textarea::CursorMove::Head);
                            }
                            (KeyCode::Char('o'), KeyModifiers::NONE) => {
                                // Insert newline below and enter edit mode
                                self.set_input_mode(InputMode::Editing);
                                self.sync_buffer_to_textarea();
                                self.textarea.move_cursor(tui_textarea::CursorMove::End);
                                self.textarea.insert_newline();
                            }
                            (KeyCode::Char('O'), KeyModifiers::NONE) => {
                                // Insert newline above and enter edit mode
                                self.set_input_mode(InputMode::Editing);
                                self.sync_buffer_to_textarea();
                                self.textarea.move_cursor(tui_textarea::CursorMove::Head);
                                self.textarea.insert_newline();
                                self.textarea.move_cursor(tui_textarea::CursorMove::Up);
                            }
                            // Basic scrolling and cursor movement
                            (KeyCode::Up, KeyModifiers::NONE)
                            | (KeyCode::Char('k'), KeyModifiers::NONE) => {
                                match self.focused_panel {
                                    FocusedPanel::Chat => {
                                        if self.chat_cursor.0 > 0 {
                                            self.chat_cursor.0 -= 1;
                                            // Scroll if cursor moves above viewport
                                            if self.chat_cursor.0 < self.auto_scroll.scroll {
                                                self.on_scroll(-1);
                                            }
                                        }
                                    }
                                    FocusedPanel::Thinking => {
                                        if self.thinking_cursor.0 > 0 {
                                            self.thinking_cursor.0 -= 1;
                                            if self.thinking_cursor.0 < self.thinking_scroll.scroll
                                            {
                                                self.on_scroll(-1);
                                            }
                                        }
                                    }
                                    FocusedPanel::Files => {
                                        self.file_tree_mut().move_cursor(-1);
                                    }
                                    FocusedPanel::Code => {
                                        let viewport = self.code_view_viewport_height().max(1);
                                        if let Some(scroll) = self.code_view_scroll_mut()
                                            && scroll.scroll > 0
                                        {
                                            scroll.on_user_scroll(-1, viewport);
                                        }
                                    }
                                    FocusedPanel::Input => {
                                        self.on_scroll(-1);
                                    }
                                }
                            }
                            (KeyCode::Down, KeyModifiers::NONE)
                            | (KeyCode::Char('j'), KeyModifiers::NONE) => {
                                match self.focused_panel {
                                    FocusedPanel::Chat => {
                                        let max_lines = self.auto_scroll.content_len;
                                        if self.chat_cursor.0 + 1 < max_lines {
                                            self.chat_cursor.0 += 1;
                                            // Scroll if cursor moves below viewport
                                            let viewport_bottom =
                                                self.auto_scroll.scroll + self.viewport_height;
                                            if self.chat_cursor.0 >= viewport_bottom {
                                                self.on_scroll(1);
                                            }
                                        }
                                    }
                                    FocusedPanel::Thinking => {
                                        let max_lines = self.thinking_scroll.content_len;
                                        if self.thinking_cursor.0 + 1 < max_lines {
                                            self.thinking_cursor.0 += 1;
                                            let viewport_bottom = self.thinking_scroll.scroll
                                                + self.thinking_viewport_height;
                                            if self.thinking_cursor.0 >= viewport_bottom {
                                                self.on_scroll(1);
                                            }
                                        }
                                    }
                                    FocusedPanel::Files => {
                                        self.file_tree_mut().move_cursor(1);
                                    }
                                    FocusedPanel::Code => {
                                        let viewport = self.code_view_viewport_height().max(1);
                                        if let Some(scroll) = self.code_view_scroll_mut() {
                                            let max_lines = scroll.content_len;
                                            if scroll.scroll + viewport < max_lines {
                                                scroll.on_user_scroll(1, viewport);
                                            }
                                        }
                                    }
                                    FocusedPanel::Input => {
                                        self.on_scroll(1);
                                    }
                                }
                            }
                            // Horizontal cursor movement
                            (KeyCode::Left, KeyModifiers::NONE)
                            | (KeyCode::Char('h'), KeyModifiers::NONE) => {
                                match self.focused_panel {
                                    FocusedPanel::Chat => {
                                        if self.chat_cursor.1 > 0 {
                                            self.chat_cursor.1 -= 1;
                                        }
                                    }
                                    FocusedPanel::Thinking => {
                                        if self.thinking_cursor.1 > 0 {
                                            self.thinking_cursor.1 -= 1;
                                        }
                                    }
                                    FocusedPanel::Code => {}
                                    _ => {}
                                }
                            }
                            (KeyCode::Right, KeyModifiers::NONE)
                            | (KeyCode::Char('l'), KeyModifiers::NONE) => {
                                match self.focused_panel {
                                    FocusedPanel::Chat => {
                                        if let Some(line) = self.get_line_at_row(self.chat_cursor.0)
                                        {
                                            let max_col = line.chars().count();
                                            if self.chat_cursor.1 < max_col {
                                                self.chat_cursor.1 += 1;
                                            }
                                        }
                                    }
                                    FocusedPanel::Thinking => {
                                        if let Some(line) =
                                            self.get_line_at_row(self.thinking_cursor.0)
                                        {
                                            let max_col = line.chars().count();
                                            if self.thinking_cursor.1 < max_col {
                                                self.thinking_cursor.1 += 1;
                                            }
                                        }
                                    }
                                    FocusedPanel::Code => {}
                                    _ => {}
                                }
                            }
                            // Word movement
                            (KeyCode::Char('w'), KeyModifiers::NONE) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    if let Some(new_col) = self.find_next_word_boundary(
                                        self.chat_cursor.0,
                                        self.chat_cursor.1,
                                    ) {
                                        self.chat_cursor.1 = new_col;
                                    }
                                }
                                FocusedPanel::Thinking => {
                                    if let Some(new_col) = self.find_next_word_boundary(
                                        self.thinking_cursor.0,
                                        self.thinking_cursor.1,
                                    ) {
                                        self.thinking_cursor.1 = new_col;
                                    }
                                }
                                FocusedPanel::Code => {}
                                _ => {}
                            },
                            (KeyCode::Char('e'), KeyModifiers::NONE) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    if let Some(new_col) =
                                        self.find_word_end(self.chat_cursor.0, self.chat_cursor.1)
                                    {
                                        self.chat_cursor.1 = new_col;
                                    }
                                }
                                FocusedPanel::Thinking => {
                                    if let Some(new_col) = self.find_word_end(
                                        self.thinking_cursor.0,
                                        self.thinking_cursor.1,
                                    ) {
                                        self.thinking_cursor.1 = new_col;
                                    }
                                }
                                FocusedPanel::Code => {}
                                _ => {}
                            },
                            (KeyCode::Char('b'), KeyModifiers::NONE) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    if let Some(new_col) = self.find_prev_word_boundary(
                                        self.chat_cursor.0,
                                        self.chat_cursor.1,
                                    ) {
                                        self.chat_cursor.1 = new_col;
                                    }
                                }
                                FocusedPanel::Thinking => {
                                    if let Some(new_col) = self.find_prev_word_boundary(
                                        self.thinking_cursor.0,
                                        self.thinking_cursor.1,
                                    ) {
                                        self.thinking_cursor.1 = new_col;
                                    }
                                }
                                FocusedPanel::Code => {}
                                _ => {}
                            },
                            (KeyCode::Char('^'), KeyModifiers::SHIFT) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    if let Some(line) = self.get_line_at_row(self.chat_cursor.0) {
                                        let first_non_blank = line
                                            .chars()
                                            .position(|c| !c.is_whitespace())
                                            .unwrap_or(0);
                                        self.chat_cursor.1 = first_non_blank;
                                    }
                                }
                                FocusedPanel::Thinking => {
                                    if let Some(line) = self.get_line_at_row(self.thinking_cursor.0)
                                    {
                                        let first_non_blank = line
                                            .chars()
                                            .position(|c| !c.is_whitespace())
                                            .unwrap_or(0);
                                        self.thinking_cursor.1 = first_non_blank;
                                    }
                                }
                                FocusedPanel::Code => {}
                                _ => {}
                            },
                            // Line start/end navigation
                            (KeyCode::Char('0'), KeyModifiers::NONE)
                            | (KeyCode::Home, KeyModifiers::NONE) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    self.chat_cursor.1 = 0;
                                }
                                FocusedPanel::Thinking => {
                                    self.thinking_cursor.1 = 0;
                                }
                                FocusedPanel::Code => {}
                                _ => {}
                            },
                            (KeyCode::Char('$'), KeyModifiers::NONE) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    if let Some(line) = self.get_line_at_row(self.chat_cursor.0) {
                                        self.chat_cursor.1 = line.chars().count();
                                    }
                                }
                                FocusedPanel::Thinking => {
                                    if let Some(line) = self.get_line_at_row(self.thinking_cursor.0)
                                    {
                                        self.thinking_cursor.1 = line.chars().count();
                                    }
                                }
                                FocusedPanel::Code => {}
                                _ => {}
                            },
                            (KeyCode::End, KeyModifiers::NONE) => match self.focused_panel {
                                FocusedPanel::Chat => {
                                    self.jump_to_bottom();
                                }
                                FocusedPanel::Thinking => {
                                    let viewport_height = self.thinking_viewport_height.max(1);
                                    self.thinking_scroll.jump_to_bottom(viewport_height);
                                }
                                FocusedPanel::Files => {
                                    self.file_tree_mut().jump_to_bottom();
                                }
                                FocusedPanel::Code => {
                                    let viewport = self.code_view_viewport_height().max(1);
                                    if let Some(scroll) = self.code_view_scroll_mut() {
                                        scroll.jump_to_bottom(viewport);
                                    }
                                }
                                FocusedPanel::Input => {}
                            },
                            // Half-page scrolling
                            (KeyCode::Char('d'), KeyModifiers::CONTROL) => {
                                self.scroll_half_page_down();
                            }
                            (KeyCode::Char('u'), KeyModifiers::CONTROL) => {
                                self.scroll_half_page_up();
                            }
                            // Full-page scrolling
                            (KeyCode::Char('f'), KeyModifiers::CONTROL)
                            | (KeyCode::PageDown, KeyModifiers::NONE) => {
                                self.scroll_full_page_down();
                            }
                            (KeyCode::Char('b'), KeyModifiers::CONTROL)
                            | (KeyCode::PageUp, KeyModifiers::NONE) => {
                                self.scroll_full_page_up();
                            }
                            // Jump to top/bottom
                            (KeyCode::Char('G'), KeyModifiers::SHIFT) => {
                                self.jump_to_bottom();
                            }
                            // Multi-key sequences
                            (KeyCode::Char('g'), KeyModifiers::NONE) => {
                                self.pending_key = Some('g');
                                self.status = "g".to_string();
                            }
                            (KeyCode::Char('d'), KeyModifiers::NONE) => {
                                self.pending_key = Some('d');
                                self.status = "d".to_string();
                            }
                            // Yank/paste (works from any panel)
                            (KeyCode::Char('p'), KeyModifiers::NONE) => {
                                if !self.clipboard.is_empty() {
                                    // Always paste into Input panel
                                    let current_lines = self.textarea.lines().to_vec();
                                    let clipboard_lines: Vec<String> =
                                        self.clipboard.lines().map(|s| s.to_string()).collect();

                                    // Append clipboard content to current input
                                    let mut new_lines = current_lines;
                                    if new_lines.is_empty() || new_lines == vec![String::new()] {
                                        new_lines = clipboard_lines;
                                    } else {
                                        // Add newline and append
                                        new_lines.push(String::new());
                                        new_lines.extend(clipboard_lines);
                                    }

                                    self.textarea = TextArea::new(new_lines);
                                    configure_textarea_defaults(&mut self.textarea);
                                    self.sync_textarea_to_buffer();
                                    self.status = "Pasted into input".to_string();
                                }
                            }
                            // Panel switching
                            (KeyCode::Tab, KeyModifiers::NONE) => {
                                self.cycle_focus_forward();
                                let panel_name = match self.focused_panel {
                                    FocusedPanel::Files => "Files",
                                    FocusedPanel::Chat => "Chat",
                                    FocusedPanel::Thinking => "Thinking",
                                    FocusedPanel::Input => "Input",
                                    FocusedPanel::Code => "Code",
                                };
                                self.status = format!("Focus: {}", panel_name);
                            }
                            (KeyCode::BackTab, KeyModifiers::SHIFT) => {
                                self.cycle_focus_backward();
                                let panel_name = match self.focused_panel {
                                    FocusedPanel::Files => "Files",
                                    FocusedPanel::Chat => "Chat",
                                    FocusedPanel::Thinking => "Thinking",
                                    FocusedPanel::Input => "Input",
                                    FocusedPanel::Code => "Code",
                                };
                                self.status = format!("Focus: {}", panel_name);
                            }
                            (KeyCode::Char('1'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL)
                                    || modifiers.contains(KeyModifiers::ALT) =>
                            {
                                if self.focus_panel(FocusedPanel::Files) {
                                    self.status = "Focus: Files (Ctrl+1)".to_string();
                                    self.error = None;
                                } else if self.is_code_mode() {
                                    self.status = "Files panel is collapsed — use :files to reopen"
                                        .to_string();
                                }
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('2'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL)
                                    || modifiers.contains(KeyModifiers::ALT) =>
                            {
                                if self.focus_panel(FocusedPanel::Chat) {
                                    self.status = "Focus: Chat (Ctrl+2)".to_string();
                                    self.error = None;
                                }
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('3'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL)
                                    || modifiers.contains(KeyModifiers::ALT) =>
                            {
                                if self.focus_panel(FocusedPanel::Code) {
                                    self.status = "Focus: Code (Ctrl+3)".to_string();
                                    self.error = None;
                                } else {
                                    self.status =
                                        "Open a file to focus the code workspace".to_string();
                                }
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('4'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL)
                                    || modifiers.contains(KeyModifiers::ALT) =>
                            {
                                if self.focus_panel(FocusedPanel::Thinking) {
                                    self.status = "Focus: Thinking (Ctrl+4)".to_string();
                                    self.error = None;
                                } else {
                                    self.status = "No reasoning panel to focus yet".to_string();
                                }
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('5'), modifiers)
                                if modifiers.contains(KeyModifiers::CONTROL)
                                    || modifiers.contains(KeyModifiers::ALT) =>
                            {
                                if self.focus_panel(FocusedPanel::Input) {
                                    self.status =
                                        "Focus: Input (Ctrl+5) — press i to edit".to_string();
                                    self.error = None;
                                }
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Char('m'), KeyModifiers::NONE) => {
                                if let Err(err) = self.show_model_picker(None).await {
                                    self.error = Some(err.to_string());
                                }
                                return Ok(AppState::Running);
                            }
                            (KeyCode::Esc, KeyModifiers::NONE) => {
                                self.pending_key = None;
                                self.set_input_mode(InputMode::Normal);
                            }
                            _ => {
                                self.pending_key = None;
                            }
                        }
                    }
                    InputMode::RepoSearch => match (key.code, key.modifiers) {
                        (KeyCode::Esc, _) => {
                            self.set_input_mode(InputMode::Normal);
                            self.status = "Normal mode".to_string();
                        }
                        (KeyCode::Enter, modifiers) if modifiers.contains(KeyModifiers::ALT) => {
                            self.open_repo_search_scratch().await?;
                        }
                        (KeyCode::Enter, _) => {
                            if self.repo_search.running() {
                                self.status = "Search already running".to_string();
                            } else if self.repo_search.dirty() || !self.repo_search.has_results() {
                                self.start_repo_search().await?;
                            } else {
                                self.open_repo_search_match().await?;
                            }
                        }
                        (KeyCode::Backspace, modifiers)
                            if !modifiers.contains(KeyModifiers::CONTROL)
                                && !modifiers.contains(KeyModifiers::ALT) =>
                        {
                            self.repo_search.pop_query_char();
                            *self.repo_search.status_mut() =
                                Some("Press Enter to search".to_string());
                            self.status = format!("Query: {}", self.repo_search.query_input());
                        }
                        (KeyCode::Char('u'), modifiers)
                            if modifiers.contains(KeyModifiers::CONTROL) =>
                        {
                            self.repo_search.clear_query();
                            *self.repo_search.status_mut() = Some("Query cleared".to_string());
                            self.status = "Query cleared".to_string();
                        }
                        (KeyCode::Delete, _) => {
                            self.repo_search.clear_query();
                            *self.repo_search.status_mut() = Some("Query cleared".to_string());
                            self.status = "Query cleared".to_string();
                        }
                        (KeyCode::Char(c), modifiers)
                            if !modifiers.contains(KeyModifiers::CONTROL)
                                && !modifiers.contains(KeyModifiers::ALT)
                                && !c.is_control() =>
                        {
                            self.repo_search.push_query_char(c);
                            *self.repo_search.status_mut() =
                                Some("Press Enter to search".to_string());
                            self.status = format!("Query: {}", self.repo_search.query_input());
                        }
                        (KeyCode::Up, _) | (KeyCode::Char('k'), KeyModifiers::NONE) => {
                            self.repo_search.move_selection(-1);
                        }
                        (KeyCode::Down, _)
                        | (KeyCode::Char('j'), KeyModifiers::NONE)
                        | (KeyCode::Char('n'), KeyModifiers::CONTROL) => {
                            self.repo_search.move_selection(1);
                        }
                        (KeyCode::PageUp, _) => {
                            self.repo_search.page(-1);
                        }
                        (KeyCode::PageDown, _) => {
                            self.repo_search.page(1);
                        }
                        (KeyCode::Home, _) => {
                            self.repo_search.scroll_to(0);
                        }
                        (KeyCode::End, _) => {
                            let max = self.repo_search.max_scroll();
                            self.repo_search.scroll_to(max);
                        }
                        _ => {}
                    },
                    InputMode::SymbolSearch => match (key.code, key.modifiers) {
                        (KeyCode::Esc, _) => {
                            self.set_input_mode(InputMode::Normal);
                            self.status = "Normal mode".to_string();
                        }
                        (KeyCode::Enter, _) => {
                            if self.symbol_search.is_running() {
                                self.status = "Symbol index still building".to_string();
                            } else {
                                self.open_symbol_search_entry().await?;
                            }
                        }
                        (KeyCode::Backspace, modifiers)
                            if !modifiers.contains(KeyModifiers::CONTROL)
                                && !modifiers.contains(KeyModifiers::ALT) =>
                        {
                            self.symbol_search.pop_query_char();
                            self.status = format!("Symbol filter: {}", self.symbol_search.query());
                        }
                        (KeyCode::Char('u'), modifiers)
                            if modifiers.contains(KeyModifiers::CONTROL) =>
                        {
                            self.symbol_search.clear_query();
                            self.status = "Symbol query cleared".to_string();
                        }
                        (KeyCode::Delete, _) => {
                            self.symbol_search.clear_query();
                            self.status = "Symbol query cleared".to_string();
                        }
                        (KeyCode::Char(c), modifiers)
                            if !modifiers.contains(KeyModifiers::CONTROL)
                                && !modifiers.contains(KeyModifiers::ALT)
                                && !c.is_control() =>
                        {
                            self.symbol_search.push_query_char(c);
                            self.status = format!("Symbol filter: {}", self.symbol_search.query());
                        }
                        (KeyCode::Up, _) | (KeyCode::Char('k'), KeyModifiers::NONE) => {
                            self.symbol_search.move_selection(-1);
                        }
                        (KeyCode::Down, _)
                        | (KeyCode::Char('j'), KeyModifiers::NONE)
                        | (KeyCode::Char('n'), KeyModifiers::CONTROL) => {
                            self.symbol_search.move_selection(1);
                        }
                        (KeyCode::PageUp, _) => {
                            self.symbol_search.page(-1);
                        }
                        (KeyCode::PageDown, _) => {
                            self.symbol_search.page(1);
                        }
                        _ => {}
                    },
                    InputMode::Editing => match (key.code, key.modifiers) {
                        (KeyCode::Char('p'), modifiers)
                            if modifiers.contains(KeyModifiers::CONTROL) =>
                        {
                            self.sync_textarea_to_buffer();
                            self.set_input_mode(InputMode::Command);
                            self.command_palette.clear();
                            self.command_palette.ensure_suggestions();
                            self.status = ":".to_string();
                        }
                        (KeyCode::Char('c'), modifiers)
                            if modifiers.contains(KeyModifiers::CONTROL) =>
                        {
                            let _ = self.cancel_active_generation()?;
                            self.sync_textarea_to_buffer();
                            self.set_input_mode(InputMode::Normal);
                            self.reset_status();
                        }
                        (KeyCode::Esc, KeyModifiers::NONE) => {
                            // Sync textarea content to input buffer before leaving edit mode
                            self.sync_textarea_to_buffer();
                            self.set_input_mode(InputMode::Normal);
                            self.reset_status();
                        }
                        (KeyCode::Char('['), modifiers)
                            if modifiers.contains(KeyModifiers::CONTROL) =>
                        {
                            self.sync_textarea_to_buffer();
                            self.set_input_mode(InputMode::Normal);
                            self.reset_status();
                        }
                        (KeyCode::Char('j' | 'J'), m) if m.contains(KeyModifiers::CONTROL) => {
                            self.textarea.insert_newline();
                        }
                        (KeyCode::Enter, KeyModifiers::NONE) => {
                            self.sync_textarea_to_buffer();
                            let effects =
                                self.apply_app_event(AppEvent::Composer(ComposerEvent::Submit));
                            self.handle_app_effects(effects).await?;
                            return Ok(AppState::Running);
                        }
                        (KeyCode::Enter, _) => {
                            // Any Enter with modifiers keeps editing and inserts a newline via tui-textarea
                            self.textarea.input(Input::from(key));
                        }
                        // History navigation
                        (KeyCode::Up, m) if m.contains(KeyModifiers::CONTROL) => {
                            self.input_buffer_mut().history_previous();
                            self.sync_buffer_to_textarea();
                        }
                        (KeyCode::Down, m) if m.contains(KeyModifiers::CONTROL) => {
                            self.input_buffer_mut().history_next();
                            self.sync_buffer_to_textarea();
                        }
                        // Vim-style navigation with Ctrl
                        (KeyCode::Char('a'), m) if m.contains(KeyModifiers::CONTROL) => {
                            self.textarea.move_cursor(tui_textarea::CursorMove::Head);
                        }
                        (KeyCode::Char('e'), m) if m.contains(KeyModifiers::CONTROL) => {
                            self.textarea.move_cursor(tui_textarea::CursorMove::End);
                        }
                        (KeyCode::Char('w'), m) if m.contains(KeyModifiers::CONTROL) => {
                            self.textarea
                                .move_cursor(tui_textarea::CursorMove::WordForward);
                        }
                        (KeyCode::Char('b'), m) if m.contains(KeyModifiers::CONTROL) => {
                            self.textarea
                                .move_cursor(tui_textarea::CursorMove::WordBack);
                        }
                        (KeyCode::Tab, m) if m.is_empty() => {
                            if !self.complete_resource_reference() {
                                self.textarea.input(Input::from(key));
                            }
                        }
                        (KeyCode::Char('r'), m) if m.contains(KeyModifiers::CONTROL) => {
                            // Redo - history next
                            self.input_buffer_mut().history_next();
                            self.sync_buffer_to_textarea();
                        }
                        _ => {
                            // Let tui-textarea handle all other input
                            self.textarea.input(Input::from(key));
                        }
                    },
                    InputMode::Visual => match (key.code, key.modifiers) {
                        (KeyCode::Esc, _) | (KeyCode::Char('v'), KeyModifiers::NONE) => {
                            // Cancel selection and return to normal mode
                            if matches!(self.focused_panel, FocusedPanel::Input) {
                                self.textarea.cancel_selection();
                            }
                            self.set_input_mode(InputMode::Normal);
                            self.visual_start = None;
                            self.visual_end = None;
                            self.reset_status();
                        }
                        (KeyCode::Char('y'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    // Yank selected text using tui-textarea's copy
                                    self.textarea.copy();
                                    // Get the yanked text from textarea's internal clipboard
                                    let yanked = self.textarea.yank_text();
                                    if !yanked.is_empty() {
                                        self.clipboard = yanked;
                                        self.status =
                                            format!("Yanked {} chars", self.clipboard.len());
                                    } else {
                                        // Fall back to yanking current line if no selection
                                        let (row, _) = self.textarea.cursor();
                                        if let Some(line) = self.textarea.lines().get(row) {
                                            self.clipboard = line.clone();
                                            self.status = format!(
                                                "Yanked line ({} chars)",
                                                self.clipboard.len()
                                            );
                                        }
                                    }
                                    self.textarea.cancel_selection();
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Yank selected lines from scrollable panels
                                    if let Some(yanked) = self.yank_from_panel() {
                                        self.clipboard = yanked;
                                        self.status =
                                            format!("Yanked {} chars", self.clipboard.len());
                                    } else {
                                        self.status = "Nothing to yank".to_string();
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                            self.set_input_mode(InputMode::Normal);
                            self.visual_start = None;
                            self.visual_end = None;
                        }
                        (KeyCode::Char('d'), KeyModifiers::NONE) | (KeyCode::Delete, _) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    // Cut (delete) selected text using tui-textarea's cut
                                    if self.textarea.cut() {
                                        // Get the cut text
                                        let cut_text = self.textarea.yank_text();
                                        self.clipboard = cut_text;
                                        self.sync_textarea_to_buffer();
                                        self.status = format!("Cut {} chars", self.clipboard.len());
                                    } else {
                                        self.status = "Nothing to cut".to_string();
                                    }
                                    self.textarea.cancel_selection();
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Can't delete from read-only panels, just yank
                                    if let Some(yanked) = self.yank_from_panel() {
                                        self.clipboard = yanked;
                                        self.status = format!(
                                            "Yanked {} chars (read-only panel)",
                                            self.clipboard.len()
                                        );
                                    } else {
                                        self.status = "Nothing to yank".to_string();
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                            self.set_input_mode(InputMode::Normal);
                            self.visual_start = None;
                            self.visual_end = None;
                        }
                        // Movement keys to extend selection
                        (KeyCode::Left, _) | (KeyCode::Char('h'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea.move_cursor(tui_textarea::CursorMove::Back);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection left (decrease column)
                                    if let Some((row, col)) = self.visual_end
                                        && col > 0
                                    {
                                        self.visual_end = Some((row, col - 1));
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Right, _) | (KeyCode::Char('l'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea.move_cursor(tui_textarea::CursorMove::Forward);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection right (increase column)
                                    if let Some((row, col)) = self.visual_end {
                                        self.visual_end = Some((row, col + 1));
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Up, _) | (KeyCode::Char('k'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea.move_cursor(tui_textarea::CursorMove::Up);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection up (decrease end row)
                                    if let Some((row, col)) = self.visual_end
                                        && row > 0
                                    {
                                        self.visual_end = Some((row - 1, col));
                                        // Scroll if needed to keep selection visible
                                        self.on_scroll(-1);
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Down, _) | (KeyCode::Char('j'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea.move_cursor(tui_textarea::CursorMove::Down);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection down (increase end row)
                                    if let Some((row, col)) = self.visual_end {
                                        // Get max lines for the current panel
                                        let max_lines =
                                            if matches!(self.focused_panel, FocusedPanel::Chat) {
                                                self.auto_scroll.content_len
                                            } else {
                                                self.thinking_scroll.content_len
                                            };
                                        if row + 1 < max_lines {
                                            self.visual_end = Some((row + 1, col));
                                            // Scroll if needed to keep selection visible
                                            self.on_scroll(1);
                                        }
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Char('w'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea
                                        .move_cursor(tui_textarea::CursorMove::WordForward);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection forward by word
                                    if let Some((row, col)) = self.visual_end {
                                        if let Some(new_col) =
                                            self.find_next_word_boundary(row, col)
                                        {
                                            self.visual_end = Some((row, new_col));
                                        }
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Char('b'), KeyModifiers::NONE) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea
                                        .move_cursor(tui_textarea::CursorMove::WordBack);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection backward by word
                                    if let Some((row, col)) = self.visual_end {
                                        if let Some(new_col) =
                                            self.find_prev_word_boundary(row, col)
                                        {
                                            self.visual_end = Some((row, new_col));
                                        }
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Char('0'), KeyModifiers::NONE) | (KeyCode::Home, _) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea.move_cursor(tui_textarea::CursorMove::Head);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection to start of line
                                    if let Some((row, _)) = self.visual_end {
                                        self.visual_end = Some((row, 0));
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        (KeyCode::Char('$'), KeyModifiers::NONE) | (KeyCode::End, _) => {
                            match self.focused_panel {
                                FocusedPanel::Input => {
                                    self.textarea.move_cursor(tui_textarea::CursorMove::End);
                                }
                                FocusedPanel::Chat | FocusedPanel::Thinking => {
                                    // Move selection to end of line
                                    if let Some((row, _)) = self.visual_end {
                                        if let Some(line) = self.get_line_at_row(row) {
                                            let line_len = line.chars().count();
                                            self.visual_end = Some((row, line_len));
                                        }
                                    }
                                }
                                FocusedPanel::Files => {}
                                FocusedPanel::Code => {}
                            }
                        }
                        _ => {
                            // Ignore all other input in visual mode (no typing allowed)
                        }
                    },
                    InputMode::Command => match (key.code, key.modifiers) {
                        (KeyCode::Esc, _) => {
                            self.set_input_mode(InputMode::Normal);
                            self.command_palette.clear();
                            self.reset_status();
                        }
                        (KeyCode::Tab, _) => {
                            // Tab completion
                            self.complete_command();
                        }
                        (KeyCode::Up, _) | (KeyCode::Char('k'), KeyModifiers::CONTROL) => {
                            // Navigate up in suggestions
                            self.command_palette.select_previous();
                        }
                        (KeyCode::Down, _) | (KeyCode::Char('j'), KeyModifiers::CONTROL) => {
                            // Navigate down in suggestions
                            self.command_palette.select_next();
                        }
                        (KeyCode::Enter, _) => {
                            // Execute command
                            let cmd_owned = self.command_palette.buffer().trim().to_string();
                            let parts: Vec<&str> = cmd_owned.split_whitespace().collect();
                            let command_raw = parts.first().copied().unwrap_or("");
                            let args = &parts[1..];

                            if !cmd_owned.is_empty() {
                                self.command_palette.remember(&cmd_owned);
                            }

                            let bare_command = command_raw.trim_end_matches('!');
                            let force = bare_command.len() != command_raw.len();

                            match bare_command {
                                "" => {}
                                "wq" | "x" => {
                                    let path_arg = if args.is_empty() {
                                        None
                                    } else {
                                        Some(args.join(" "))
                                    };
                                    let result =
                                        self.save_active_code_buffer(path_arg, force).await?;
                                    if matches!(result, SaveStatus::Saved | SaveStatus::NoChanges) {
                                        self.close_active_code_buffer(force);
                                    }
                                }
                                "w" | "write" | "save" => {
                                    let path_arg = if args.is_empty() {
                                        None
                                    } else {
                                        Some(args.join(" "))
                                    };
                                    let _ = self.save_active_code_buffer(path_arg, force).await?;
                                }
                                "q" => {
                                    if matches!(self.focused_panel, FocusedPanel::Files)
                                        && !self.is_file_panel_collapsed()
                                    {
                                        self.collapse_file_panel();
                                        self.status = "Files panel hidden".to_string();
                                        self.error = None;
                                    } else {
                                        self.close_active_code_buffer(force);
                                    }
                                }
                                "quit" => {
                                    if matches!(self.focused_panel, FocusedPanel::Files)
                                        && !self.is_file_panel_collapsed()
                                    {
                                        self.collapse_file_panel();
                                        self.status = "Files panel hidden".to_string();
                                        self.error = None;
                                    } else {
                                        return Ok(AppState::Quit);
                                    }
                                }
                                "create" => {
                                    if !self.is_code_mode() {
                                        self.status = "File operations are available in code mode"
                                            .to_string();
                                        self.error = None;
                                        self.set_input_mode(InputMode::Normal);
                                        self.command_palette.clear();
                                        return Ok(AppState::Running);
                                    }
                                    if args.is_empty() {
                                        self.error = Some("Usage: :create <path>".to_string());
                                    } else {
                                        let path_arg = args.join(" ");
                                        match self.create_file_from_command(&path_arg) {
                                            Ok(message) => {
                                                self.status = message;
                                                self.error = None;
                                            }
                                            Err(err) => {
                                                self.status = "File creation failed".to_string();
                                                self.error = Some(err.to_string());
                                            }
                                        }
                                    }
                                }
                                "files" | "explorer" => {
                                    if !self.is_code_mode() {
                                        self.status =
                                            "File explorer is available in code mode".to_string();
                                        self.error = None;
                                        self.set_input_mode(InputMode::Normal);
                                        self.command_palette.clear();
                                        return Ok(AppState::Running);
                                    }
                                    let was_collapsed = self.is_file_panel_collapsed();
                                    self.toggle_file_panel();
                                    let now_collapsed = self.is_file_panel_collapsed();
                                    self.error = None;

                                    if was_collapsed && !now_collapsed {
                                        self.status = "Files panel shown".to_string();
                                    } else if !was_collapsed && now_collapsed {
                                        self.status = "Files panel hidden".to_string();
                                    } else {
                                        self.status = "Files panel unchanged".to_string();
                                    }
                                }
                                "markdown" => {
                                    let desired = if let Some(arg) = args.first() {
                                        match arg.to_ascii_lowercase().as_str() {
                                            "on" | "enable" | "enabled" | "true" => Some(true),
                                            "off" | "disable" | "disabled" | "false" => Some(false),
                                            "toggle" => None,
                                            other => {
                                                self.error = Some(format!(
                                                    "Unknown markdown option '{}'. Use on, off, or toggle.",
                                                    other
                                                ));
                                                self.status =
                                                    "Usage: :markdown [on|off|toggle]".to_string();
                                                self.set_input_mode(InputMode::Normal);
                                                self.command_palette.clear();
                                                return Ok(AppState::Running);
                                            }
                                        }
                                    } else {
                                        None
                                    };

                                    let enable =
                                        desired.unwrap_or_else(|| !self.render_markdown_enabled());
                                    self.set_render_markdown(enable);
                                    self.set_input_mode(InputMode::Normal);
                                    self.command_palette.clear();
                                    return Ok(AppState::Running);
                                }
                                "c" | "clear" => {
                                    self.controller.clear();
                                    self.chat_line_offset = 0;
                                    self.auto_scroll = AutoScroll::default();
                                    self.clear_new_message_alert();
                                    self.status = "Conversation cleared".to_string();
                                }
                                "session" => {
                                    if let Some(subcommand) = args.first() {
                                        match subcommand.to_ascii_lowercase().as_str() {
                                            "save" => {
                                                let name = if args.len() > 1 {
                                                    Some(args[1..].join(" "))
                                                } else {
                                                    None
                                                };
                                                let description = if self
                                                    .controller
                                                    .config()
                                                    .storage
                                                    .generate_descriptions
                                                {
                                                    self.status =
                                                        "Generating description...".to_string();
                                                    (self
                                                        .controller
                                                        .generate_conversation_description()
                                                        .await)
                                                        .ok()
                                                } else {
                                                    None
                                                };

                                                match self
                                                    .controller
                                                    .save_active_session(name.clone(), description)
                                                    .await
                                                {
                                                    Ok(id) => {
                                                        self.status = if let Some(name) = name {
                                                            format!("Session saved: {name} ({id})")
                                                        } else {
                                                            format!("Session saved with id {id}")
                                                        };
                                                        self.error = None;
                                                    }
                                                    Err(e) => {
                                                        self.error = Some(format!(
                                                            "Failed to save session: {}",
                                                            e
                                                        ));
                                                    }
                                                }
                                            }
                                            other => {
                                                self.error = Some(format!(
                                                    "Unknown session subcommand: {}",
                                                    other
                                                ));
                                            }
                                        }
                                    } else {
                                        self.status =
                                            "Session commands: :session save [name]".to_string();
                                        self.error = None;
                                    }
                                }
                                "oauth" => {
                                    if args.is_empty() {
                                        let pending = self.controller.pending_oauth_servers();
                                        if pending.is_empty() {
                                            self.status =
                                                "No OAuth-enabled MCP servers require authorization."
                                                    .to_string();
                                        } else {
                                            self.status = format!(
                                                "Pending OAuth servers: {}",
                                                pending.join(", ")
                                            );
                                        }
                                        self.error = None;
                                    } else if args.len() == 1 {
                                        self.start_oauth_login(args[0]).await?;
                                    } else if args.len() == 2
                                        && args[0].eq_ignore_ascii_case("login")
                                    {
                                        self.start_oauth_login(args[1]).await?;
                                    } else {
                                        self.error =
                                            Some("Usage: :oauth [login] <server>".to_string());
                                    }
                                }
                                "load" | "o" => {
                                    // Load saved sessions and enter browser mode
                                    match self.controller.list_saved_sessions().await {
                                        Ok(sessions) => {
                                            self.saved_sessions = sessions;
                                            self.selected_session_index = 0;
                                            self.set_input_mode(InputMode::SessionBrowser);
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        Err(e) => {
                                            self.error =
                                                Some(format!("Failed to list sessions: {}", e));
                                        }
                                    }
                                }
                                "open" => {
                                    if let Some(path) = args.first() {
                                        if !matches!(
                                            self.operating_mode,
                                            owlen_core::mode::Mode::Code
                                        ) {
                                            self.error = Some(
                                                "Code view requires code mode. Run :mode code first."
                                                    .to_string(),
                                            );
                                        } else {
                                            match self.controller.read_file_with_tools(path).await {
                                                Ok(content) => {
                                                    let absolute =
                                                        self.absolute_tree_path(Path::new(path));
                                                    self.set_code_view_content(
                                                        path.to_string(),
                                                        Some(absolute),
                                                        content,
                                                    );
                                                    self.focused_panel = FocusedPanel::Code;
                                                    self.ensure_focus_valid();
                                                    self.status = format!("Opened {}", path);
                                                    self.set_system_status(format!(
                                                        "Viewing {}",
                                                        path
                                                    ));
                                                    self.error = None;
                                                }
                                                Err(e) => {
                                                    self.error =
                                                        Some(format!("Failed to open file: {}", e));
                                                }
                                            }
                                        }
                                    } else {
                                        self.error = Some("Usage: :open <path>".to_string());
                                    }
                                }
                                "close" => {
                                    if self.has_loaded_code_view() {
                                        self.close_code_view();
                                        self.status = "Closed code view".to_string();
                                        self.set_system_status(String::new());
                                        self.error = None;
                                    } else {
                                        self.status = "No code view active".to_string();
                                    }
                                }
                                "sessions" => {
                                    // List saved sessions
                                    match self.controller.list_saved_sessions().await {
                                        Ok(sessions) => {
                                            self.saved_sessions = sessions;
                                            self.selected_session_index = 0;
                                            self.set_input_mode(InputMode::SessionBrowser);
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        Err(e) => {
                                            self.error =
                                                Some(format!("Failed to list sessions: {}", e));
                                        }
                                    }
                                }
                                "mode" => {
                                    // Switch mode with argument: :mode chat or :mode code
                                    if args.is_empty() {
                                        self.status = format!(
                                            "Current mode: {}. Usage: :mode <chat|code>",
                                            self.operating_mode
                                        );
                                    } else {
                                        let mode_str = args[0];
                                        match mode_str.parse::<owlen_core::mode::Mode>() {
                                            Ok(new_mode) => {
                                                self.set_mode(new_mode).await;
                                            }
                                            Err(err) => {
                                                self.error = Some(err);
                                            }
                                        }
                                    }
                                }
                                "code" => {
                                    // Shortcut to switch to code mode
                                    self.set_mode(owlen_core::mode::Mode::Code).await;
                                }
                                "chat" => {
                                    // Shortcut to switch to chat mode
                                    self.set_mode(owlen_core::mode::Mode::Chat).await;
                                }
                                "tools" => {
                                    // List available tools in current mode
                                    let available_tools: Vec<String> = {
                                        let config = self.config_async().await;
                                        vec![
                                            "web_search".to_string(),
                                            "code_exec".to_string(),
                                            "file_write".to_string(),
                                        ]
                                        .into_iter()
                                        .filter(|tool| {
                                            config.modes.is_tool_allowed(self.operating_mode, tool)
                                        })
                                        .collect()
                                    }; // config dropped here

                                    if available_tools.is_empty() {
                                        self.status = format!(
                                            "No tools available in {} mode",
                                            self.operating_mode
                                        );
                                    } else {
                                        self.status = format!(
                                            "Available tools in {} mode: {}",
                                            self.operating_mode,
                                            available_tools.join(", ")
                                        );
                                    }
                                }
                                "h" | "help" => {
                                    self.set_input_mode(InputMode::Help);
                                    self.status = "Help".to_string();
                                    self.error = None;
                                    self.command_palette.clear();
                                    return Ok(AppState::Running);
                                }
                                "m" | "model" => {
                                    if args.is_empty() {
                                        if let Err(err) = self.show_model_picker(None).await {
                                            self.error = Some(err.to_string());
                                        }
                                        self.command_palette.clear();
                                        return Ok(AppState::Running);
                                    }
                                    let subcommand = args[0].to_lowercase();
                                    match subcommand.as_str() {
                                        "info" | "details" | "refresh" => {
                                            let outcome: Result<()> = match subcommand.as_str() {
                                                "info" => {
                                                    let target = if args.len() > 1 {
                                                        args[1..].join(" ")
                                                    } else {
                                                        self.controller.selected_model().to_string()
                                                    };
                                                    if target.trim().is_empty() {
                                                        Err(anyhow!("Usage: :model info <name>"))
                                                    } else {
                                                        self.ensure_model_details(&target, false)
                                                            .await
                                                    }
                                                }
                                                "details" => {
                                                    let target = self
                                                        .controller
                                                        .selected_model()
                                                        .to_string();
                                                    if target.trim().is_empty() {
                                                        Err(anyhow!(
                                                            "No active model set. Use :model to choose one first"
                                                        ))
                                                    } else {
                                                        self.ensure_model_details(&target, false)
                                                            .await
                                                    }
                                                }
                                                _ => {
                                                    let target = if args.len() > 1 {
                                                        args[1..].join(" ")
                                                    } else {
                                                        self.controller.selected_model().to_string()
                                                    };
                                                    if target.trim().is_empty() {
                                                        Err(anyhow!("Usage: :model refresh <name>"))
                                                    } else {
                                                        self.ensure_model_details(&target, true)
                                                            .await
                                                    }
                                                }
                                            };

                                            match outcome {
                                                Ok(_) => self.error = None,
                                                Err(err) => self.error = Some(err.to_string()),
                                            }
                                            self.set_input_mode(InputMode::Normal);
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        _ => {
                                            let filter = args.join(" ");
                                            match self.select_model_with_filter(&filter).await {
                                                Ok(_) => self.error = None,
                                                Err(err) => {
                                                    self.status = err.to_string();
                                                    self.error = Some(err.to_string());
                                                }
                                            }
                                            self.set_input_mode(InputMode::Normal);
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                    }
                                }
                                "provider" => {
                                    if args.is_empty() {
                                        self.error = Some("Usage: :provider <name>".to_string());
                                        self.status = "Usage: :provider <name>".to_string();
                                    } else {
                                        let provider_query = args[0].to_string();
                                        let mode_arg = args.get(1).map(|value| value.to_string());

                                        if let Some(mode_value) = mode_arg {
                                            if let Some(provider) =
                                                self.best_provider_match(&provider_query)
                                            {
                                                match self
                                                    .apply_provider_mode(&provider, &mode_value)
                                                    .await
                                                {
                                                    Ok(_) => {
                                                        self.selected_provider = provider.clone();
                                                        self.update_selected_provider_index();
                                                    }
                                                    Err(err) => {
                                                        self.error = Some(err.to_string());
                                                        self.status = err.to_string();
                                                    }
                                                }
                                            } else {
                                                self.error = Some(format!(
                                                    "No provider matching '{}'",
                                                    provider_query
                                                ));
                                                self.status = format!(
                                                    "No provider matching '{}'",
                                                    provider_query.trim()
                                                );
                                            }
                                        } else {
                                            if self.available_providers.is_empty() {
                                                if let Err(err) = self.refresh_models().await {
                                                    self.error = Some(format!(
                                                        "Failed to refresh providers: {}",
                                                        err
                                                    ));
                                                    self.status =
                                                        "Unable to refresh providers".to_string();
                                                }
                                            }

                                            let filter = provider_query;
                                            if let Some(provider) =
                                                self.best_provider_match(&filter)
                                            {
                                                match self.switch_to_provider(&provider).await {
                                                    Ok(_) => {
                                                        self.selected_provider = provider.clone();
                                                        self.update_selected_provider_index();
                                                        self.controller
                                                            .config_mut()
                                                            .general
                                                            .default_provider = provider.clone();
                                                        match config::save_config(
                                                            &self.controller.config(),
                                                        ) {
                                                            Ok(_) => self.error = None,
                                                            Err(err) => {
                                                                self.error = Some(format!(
                                                                    "Provider switched but config save failed: {}",
                                                                    err
                                                                ));
                                                                self.status =
                                                                    "Provider switch saved with warnings"
                                                                        .to_string();
                                                            }
                                                        }
                                                        self.status = format!(
                                                            "Active provider: {}",
                                                            provider
                                                        );
                                                        if let Err(err) =
                                                            self.refresh_models().await
                                                        {
                                                            self.error = Some(format!(
                                                                "Provider switched but refreshing models failed: {}",
                                                                err
                                                            ));
                                                            self.status =
                                                                "Provider switched; failed to refresh models"
                                                                    .to_string();
                                                        }
                                                        self.context_usage = None;
                                                        self.refresh_usage_summary().await?;
                                                    }
                                                    Err(err) => {
                                                        self.error = Some(format!(
                                                            "Failed to switch provider: {}",
                                                            err
                                                        ));
                                                        self.status =
                                                            "Provider switch failed".to_string();
                                                    }
                                                }
                                            } else {
                                                self.error = Some(format!(
                                                    "No provider matching '{}'",
                                                    filter
                                                ));
                                                self.status = format!(
                                                    "No provider matching '{}'",
                                                    filter.trim()
                                                );
                                            }
                                        }
                                    }
                                    self.set_input_mode(InputMode::Normal);
                                    self.command_palette.clear();
                                    return Ok(AppState::Running);
                                }
                                "limits" => {
                                    self.show_usage_limits().await?;
                                    self.set_input_mode(InputMode::Normal);
                                    self.command_palette.clear();
                                    return Ok(AppState::Running);
                                }
                                "models" => {
                                    if args.is_empty() {
                                        if let Err(err) = self.show_model_picker(None).await {
                                            self.error = Some(err.to_string());
                                        }
                                        self.command_palette.clear();
                                        return Ok(AppState::Running);
                                    }

                                    match args[0] {
                                        "--local" => {
                                            if let Err(err) = self
                                                .show_model_picker(Some(FilterMode::LocalOnly))
                                                .await
                                            {
                                                self.error = Some(err.to_string());
                                            } else if !self
                                                .focus_first_model_in_scope(&ModelScope::Local)
                                            {
                                                self.status =
                                                    "No local models available".to_string();
                                            } else {
                                                self.status = "Showing local models".to_string();
                                                self.error = None;
                                            }
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        "--cloud" => {
                                            if let Err(err) = self
                                                .show_model_picker(Some(FilterMode::CloudOnly))
                                                .await
                                            {
                                                self.error = Some(err.to_string());
                                            } else if !self
                                                .focus_first_model_in_scope(&ModelScope::Cloud)
                                            {
                                                self.status =
                                                    "No cloud models available".to_string();
                                            } else {
                                                self.status = "Showing cloud models".to_string();
                                                self.error = None;
                                            }
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        "--available" => {
                                            if let Err(err) = self
                                                .show_model_picker(Some(FilterMode::Available))
                                                .await
                                            {
                                                self.error = Some(err.to_string());
                                            } else if !self.focus_first_available_model() {
                                                self.status =
                                                    "No available models right now".to_string();
                                            } else {
                                                self.status =
                                                    "Showing available models".to_string();
                                                self.error = None;
                                            }
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        "info" => {
                                            let force_refresh = args
                                                .get(1)
                                                .map(|flag| {
                                                    matches!(*flag, "refresh" | "-r" | "--refresh")
                                                })
                                                .unwrap_or(false);
                                            let outcome = self
                                                .prefetch_all_model_details(force_refresh)
                                                .await;

                                            match outcome {
                                                Ok(_) => self.error = None,
                                                Err(err) => self.error = Some(err.to_string()),
                                            }

                                            self.set_input_mode(InputMode::Normal);
                                            self.command_palette.clear();
                                            return Ok(AppState::Running);
                                        }
                                        _ => {
                                            self.error = Some(
                                                "Usage: :models [--local|--cloud|info]".to_string(),
                                            );
                                            self.status =
                                                "Usage: :models [--local|--cloud|info]".to_string();
                                        }
                                    }

                                    self.set_input_mode(InputMode::Normal);
                                    self.command_palette.clear();
                                    return Ok(AppState::Running);
                                }
                                // "run-agent" command removed to break circular dependency on owlen-cli.
                                "agent" => {
                                    if let Some(subcommand) = args.first() {
                                        match subcommand.to_lowercase().as_str() {
                                            "status" => {
                                                let armed =
                                                    if self.agent_mode { "armed" } else { "idle" };
                                                let running = if self.agent_running {
                                                    "running"
                                                } else {
                                                    "stopped"
                                                };
                                                self.status =
                                                    format!("Agent status: {armed} · {running}");
                                                self.error = None;
                                            }
                                            "start" | "arm" => {
                                                if self.agent_running {
                                                    self.status =
                                                        "Agent is already running".to_string();
                                                } else {
                                                    self.agent_mode = true;
                                                    self.status = "Agent armed. Next message will be processed by the agent.".to_string();
                                                    self.error = None;
                                                }
                                            }
                                            "stop" => {
                                                if self.agent_running {
                                                    self.agent_running = false;
                                                    self.agent_mode = false;
                                                    self.agent_actions = None;
                                                    self.status =
                                                        "Agent execution stopped".to_string();
                                                    self.error = None;
                                                } else if self.agent_mode {
                                                    self.agent_mode = false;
                                                    self.agent_actions = None;
                                                    self.status = "Agent disarmed".to_string();
                                                    self.error = None;
                                                } else {
                                                    self.status =
                                                        "No agent is currently running".to_string();
                                                }
                                            }
                                            other => {
                                                self.error =
                                                    Some(format!("Unknown agent command: {other}"));
                                            }
                                        }
                                    } else if self.agent_running {
                                        self.status = "Agent is already running".to_string();
                                    } else {
                                        self.agent_mode = true;
                                        self.status = "Agent mode enabled. Next message will be processed by agent.".to_string();
                                        self.error = None;
                                    }
                                }
                                "stop-agent" => {
                                    if self.agent_running {
                                        self.agent_running = false;
                                        self.agent_mode = false;
                                        self.agent_actions = None;
                                        self.status = "Agent execution stopped".to_string();
                                        self.error = None;
                                    } else if self.agent_mode {
                                        self.agent_mode = false;
                                        self.agent_actions = None;
                                        self.status = "Agent disarmed".to_string();
                                        self.error = None;
                                    } else {
                                        self.status = "No agent is currently running".to_string();
                                    }
                                }
                                "n" | "new" => {
                                    self.controller.start_new_conversation(None, None);
                                    self.reset_after_new_conversation()?;
                                    self.status = "Started new conversation".to_string();
                                    self.error = None;
                                }
                                "e" | "edit" => {
                                    if let Some(path) = args.first() {
                                        match self.controller.read_file(path).await {
                                            Ok(content) => {
                                                let message = format!(
                                                    "The content of file `{}` is:\n```\n{}\n```",
                                                    path, content
                                                );
                                                self.controller
                                                    .conversation_mut()
                                                    .push_user_message(message);
                                                self.pending_llm_request = true;
                                            }
                                            Err(e) => {
                                                self.error =
                                                    Some(format!("Failed to read file: {}", e));
                                            }
                                        }
                                    } else {
                                        self.error = Some("Usage: :e <path>".to_string());
                                    }
                                }
                                "ls" => {
                                    let path = args.first().copied().unwrap_or(".");
                                    match self.controller.list_dir(path).await {
                                        Ok(entries) => {
                                            let message = format!(
                                                "Directory listing for `{}`:\n```\n{}\n```",
                                                path,
                                                entries.join("\n")
                                            );
                                            self.controller
                                                .conversation_mut()
                                                .push_user_message(message);
                                        }
                                        Err(e) => {
                                            self.error =
                                                Some(format!("Failed to list directory: {}", e));
                                        }
                                    }
                                }
                                "theme" => {
                                    if args.is_empty() {
                                        self.error = Some("Usage: :theme <name>".to_string());
                                    } else {
                                        let theme_name = args.join(" ");
                                        match self.switch_theme(&theme_name) {
                                            Ok(_) => {
                                                // Success message already set by switch_theme
                                            }
                                            Err(_) => {
                                                // Error message already set by switch_theme
                                            }
                                        }
                                    }
                                }
                                "tutorial" => {
                                    self.show_tutorial();
                                }
                                "themes" => {
                                    // Load all themes and enter browser mode
                                    let themes = owlen_core::theme::load_all_themes();
                                    let mut theme_list: Vec<String> =
                                        themes.keys().cloned().collect();
                                    theme_list.sort();

                                    self.available_themes = theme_list;

                                    // Set selected index to current theme
                                    let current_theme = &self.theme.name;
                                    self.selected_theme_index = self
                                        .available_themes
                                        .iter()
                                        .position(|name| name == current_theme)
                                        .unwrap_or(0);

                                    self.set_input_mode(InputMode::ThemeBrowser);
                                    self.command_palette.clear();
                                    return Ok(AppState::Running);
                                }
                                "layout" => {
                                    if let Some(subcommand) = args.first() {
                                        match subcommand.to_lowercase().as_str() {
                                            "save" => {
                                                if self.code_workspace.tabs().is_empty() {
                                                    self.status =
                                                        "No open panes to save".to_string();
                                                    self.error = None;
                                                    self.push_toast(
                                                        ToastLevel::Warning,
                                                        "Open a pane before saving layout.",
                                                    );
                                                } else {
                                                    self.persist_workspace_layout();
                                                    self.status =
                                                        "Workspace layout saved".to_string();
                                                    self.error = None;
                                                    self.push_toast(
                                                        ToastLevel::Success,
                                                        "Workspace layout saved.",
                                                    );
                                                }
                                            }
                                            "load" => match self.restore_workspace_layout().await {
                                                Ok(true) => {
                                                    self.status =
                                                        "Workspace layout restored".to_string();
                                                    self.error = None;
                                                    self.push_toast(
                                                        ToastLevel::Success,
                                                        "Workspace layout restored.",
                                                    );
                                                }
                                                Ok(false) => {
                                                    self.status =
                                                        "No saved layout to restore".to_string();
                                                    self.error = None;
                                                    self.push_toast(
                                                        ToastLevel::Info,
                                                        "No saved layout was found.",
                                                    );
                                                }
                                                Err(err) => {
                                                    let message = format!(
                                                        "Failed to restore workspace layout: {}",
                                                        err
                                                    );
                                                    self.error = Some(message.clone());
                                                    self.status =
                                                        "Failed to restore workspace layout"
                                                            .to_string();
                                                    self.push_toast(ToastLevel::Error, message);
                                                }
                                            },
                                            other => {
                                                self.status =
                                                    format!("Unknown layout command: {other}");
                                                self.error = Some(format!(
                                                    "Unknown layout subcommand: {other}"
                                                ));
                                            }
                                        }
                                    } else {
                                        self.status = "Usage: :layout <save|load>".to_string();
                                    }
                                }
                                "reload" => {
                                    // Reload config
                                    match owlen_core::config::Config::load(None) {
                                        Ok(new_config) => {
                                            // Update controller config
                                            *self.controller.config_mut() = new_config.clone();

                                            // Reload theme based on updated config
                                            let theme_name = &new_config.ui.theme;
                                            if let Some(new_theme) =
                                                owlen_core::theme::get_theme(theme_name)
                                            {
                                                self.theme = new_theme;
                                                self.status = format!(
                                                    "Configuration and theme reloaded (theme: {})",
                                                    theme_name
                                                );
                                            } else {
                                                self.status = "Configuration reloaded, but theme not found. Using current theme.".to_string();
                                            }
                                            self.error = None;
                                            self.sync_ui_preferences_from_config();
                                            self.update_command_palette_catalog();
                                            if let Err(err) = self.refresh_resource_catalog().await
                                            {
                                                self.push_toast(
                                                    ToastLevel::Error,
                                                    format!(
                                                        "Failed to refresh MCP resources: {}",
                                                        err
                                                    ),
                                                );
                                            }
                                            if let Err(err) =
                                                self.refresh_mcp_slash_commands().await
                                            {
                                                self.push_toast(
                                                    ToastLevel::Error,
                                                    format!(
                                                        "Failed to refresh MCP slash commands: {}",
                                                        err
                                                    ),
                                                );
                                            }
                                        }
                                        Err(e) => {
                                            self.error =
                                                Some(format!("Failed to reload config: {}", e));
                                        }
                                    }
                                }
                                "cloud" => {
                                    match self.handle_cloud_command(args).await {
                                        Ok(_) => {
                                            if self.error.is_some() {
                                                // leave existing error
                                            } else {
                                                self.error = None;
                                            }
                                        }
                                        Err(err) => {
                                            let message = err.to_string();
                                            if self.status.trim().is_empty() {
                                                self.status = message.clone();
                                            }
                                            self.error = Some(message);
                                        }
                                    }
                                    self.command_palette.clear();
                                    self.set_input_mode(InputMode::Normal);
                                    return Ok(AppState::Running);
                                }
                                "web" => {
                                    let action =
                                        args.get(0).map(|value| value.to_ascii_lowercase());
                                    match action.as_deref() {
                                        Some("on") | Some("enable") => {
                                            match self.set_web_tool_enabled(true).await {
                                                Ok(_) => {
                                                    self.status = "Web search enabled; remote lookups allowed."
                                                        .to_string();
                                                    self.error = None;
                                                    self.push_toast(
                                                        ToastLevel::Info,
                                                        "Web search enabled; remote lookups allowed.",
                                                    );
                                                }
                                                Err(err) => {
                                                    self.status =
                                                        "Failed to enable web search".to_string();
                                                    self.error = Some(format!(
                                                        "Failed to enable web search: {}",
                                                        err
                                                    ));
                                                }
                                            }
                                        }
                                        Some("off") | Some("disable") => {
                                            match self.set_web_tool_enabled(false).await {
                                                Ok(_) => {
                                                    self.status =
                                                        "Web search disabled; staying local."
                                                            .to_string();
                                                    self.error = None;
                                                    self.push_toast(
                                                        ToastLevel::Warning,
                                                        "Web search disabled; staying local.",
                                                    );
                                                }
                                                Err(err) => {
                                                    self.status =
                                                        "Failed to disable web search".to_string();
                                                    self.error = Some(format!(
                                                        "Failed to disable web search: {}",
                                                        err
                                                    ));
                                                }
                                            }
                                        }
                                        Some("status") | None => {
                                            {
                                                let config = self.controller.config();
                                                let enabled = config.tools.web_search.enabled
                                                    && config.privacy.enable_remote_search;
                                                if enabled {
                                                    self.status =
                                                        "Web search is enabled.".to_string();
                                                } else {
                                                    self.status =
                                                        "Web search is disabled.".to_string();
                                                }
                                            }
                                            self.error = None;
                                        }
                                        _ => {
                                            self.status = "Usage: :web <on|off|status>".to_string();
                                            self.error =
                                                Some("Usage: :web <on|off|status>".to_string());
                                        }
                                    }
                                    self.command_palette.clear();
                                    self.set_input_mode(InputMode::Normal);
                                    return Ok(AppState::Running);
                                }
                                "privacy-enable" => {
                                    if let Some(tool) = args.first() {
                                        match self.controller.set_tool_enabled(tool, true).await {
                                            Ok(_) => {
                                                if let Err(err) =
                                                    config::save_config(&self.controller.config())
                                                {
                                                    self.error = Some(format!(
                                                        "Enabled {tool}, but failed to save config: {err}"
                                                    ));
                                                } else {
                                                    self.status = format!("Enabled tool: {tool}");
                                                    self.error = None;
                                                }
                                            }
                                            Err(e) => {
                                                self.error =
                                                    Some(format!("Failed to enable tool: {}", e));
                                            }
                                        }
                                    } else {
                                        self.error =
                                            Some("Usage: :privacy-enable <tool>".to_string());
                                    }
                                }
                                "privacy-disable" => {
                                    if let Some(tool) = args.first() {
                                        match self.controller.set_tool_enabled(tool, false).await {
                                            Ok(_) => {
                                                if let Err(err) =
                                                    config::save_config(&self.controller.config())
                                                {
                                                    self.error = Some(format!(
                                                        "Disabled {tool}, but failed to save config: {err}"
                                                    ));
                                                } else {
                                                    self.status = format!("Disabled tool: {tool}");
                                                    self.error = None;
                                                }
                                            }
                                            Err(e) => {
                                                self.error =
                                                    Some(format!("Failed to disable tool: {}", e));
                                            }
                                        }
                                    } else {
                                        self.error =
                                            Some("Usage: :privacy-disable <tool>".to_string());
                                    }
                                }
                                "privacy-clear" => {
                                    match self.controller.clear_secure_data().await {
                                        Ok(_) => {
                                            self.status = "Cleared secure stored data".to_string();
                                            self.error = None;
                                        }
                                        Err(e) => {
                                            self.error =
                                                Some(format!("Failed to clear secure data: {}", e));
                                        }
                                    }
                                }
                                "keymap" => {
                                    if let Some(arg) = args.first() {
                                        match KeymapProfile::from_str(arg) {
                                            Some(profile) if profile.is_builtin() => {
                                                self.switch_keymap_profile(profile).await?;
                                            }
                                            Some(_) => {
                                                self.error = Some(
                                                    "Custom keymaps must be configured via keymap_path".to_string(),
                                                );
                                            }
                                            None => {
                                                self.error = Some(format!(
                                                    "Unknown keymap profile: {}",
                                                    arg
                                                ));
                                            }
                                        }
                                    } else {
                                        self.status = format!(
                                            "Active keymap: {}",
                                            self.current_keymap_profile().label()
                                        );
                                        self.error = None;
                                    }
                                }
                                _ => {
                                    self.error = Some(format!("Unknown command: {}", cmd_owned));
                                }
                            }
                            self.command_palette.clear();
                            self.set_input_mode(InputMode::Normal);
                        }
                        (KeyCode::Char(c), KeyModifiers::NONE)
                        | (KeyCode::Char(c), KeyModifiers::SHIFT) => {
                            self.command_palette.push_char(c);
                            self.status = format!(":{}", self.command_palette.buffer());
                        }
                        (KeyCode::Backspace, _) => {
                            self.command_palette.pop_char();
                            self.status = format!(":{}", self.command_palette.buffer());
                        }
                        _ => {}
                    },
                    InputMode::ProviderSelection => match key.code {
                        KeyCode::Esc => {
                            self.set_input_mode(InputMode::Normal);
                        }
                        KeyCode::Enter => {
                            if let Some(provider) =
                                self.available_providers.get(self.selected_provider_index)
                            {
                                self.selected_provider = provider.clone();
                                // Update model selection based on new provider (await async)
                                self.sync_selected_model_index().await; // Update model selection based on new provider
                                self.set_input_mode(InputMode::ModelSelection);
                            }
                        }
                        KeyCode::Up => {
                            if self.selected_provider_index > 0 {
                                self.selected_provider_index -= 1;
                            }
                        }
                        KeyCode::Down => {
                            if self.selected_provider_index + 1 < self.available_providers.len() {
                                self.selected_provider_index += 1;
                            }
                        }
                        _ => {}
                    },
                    InputMode::ModelSelection => match key.code {
                        KeyCode::Esc => {
                            if self.show_model_info {
                                self.set_model_info_visible(false);
                                self.status = "Closed model info panel".to_string();
                            } else {
                                self.set_input_mode(InputMode::Normal);
                            }
                        }
                        KeyCode::Enter => {
                            if let Some(item) = self.current_model_selector_item() {
                                match item.kind() {
                                    ModelSelectorItemKind::Header {
                                        provider, expanded, ..
                                    } => {
                                        if *expanded {
                                            let provider_name = provider.clone();
                                            self.collapse_provider(&provider_name);
                                            self.status =
                                                format!("Collapsed provider: {}", provider_name);
                                        } else {
                                            let provider_name = provider.clone();
                                            self.expand_provider(&provider_name, true);
                                            self.status =
                                                format!("Expanded provider: {}", provider_name);
                                        }
                                        self.error = None;
                                    }
                                    ModelSelectorItemKind::Scope { provider, .. } => {
                                        let provider_name = provider.clone();
                                        self.expand_provider(&provider_name, false);
                                        self.status =
                                            format!("Expanded provider: {}", provider_name);
                                        self.error = None;
                                    }
                                    ModelSelectorItemKind::Model { .. } => {
                                        if let Some(model) = self.selected_model_info().cloned() {
                                            if self.apply_model_selection(model).await.is_err() {
                                                // apply_model_selection already sets status/error
                                            }
                                        } else {
                                            self.error = Some(
                                                "No model available for the selected provider"
                                                    .to_string(),
                                            );
                                        }
                                    }
                                    ModelSelectorItemKind::Empty { provider, .. } => {
                                        let provider_name = provider.clone();
                                        self.collapse_provider(&provider_name);
                                        self.status =
                                            format!("Collapsed provider: {}", provider_name);
                                        self.error = None;
                                    }
                                }
                            }
                        }
                        KeyCode::Char('q') => {
                            if self.show_model_info {
                                self.set_model_info_visible(false);
                                self.status = "Closed model info panel".to_string();
                            } else {
                                self.set_input_mode(InputMode::Normal);
                            }
                        }
                        KeyCode::Char('i') => {
                            if let Some(model) = self.selected_model_info() {
                                let model_id = model.id.clone();
                                if let Err(err) = self.ensure_model_details(&model_id, false).await
                                {
                                    self.error =
                                        Some(format!("Failed to load model info: {}", err));
                                }
                            }
                        }
                        KeyCode::Char('r') => {
                            if let Some(model) = self.selected_model_info() {
                                let model_id = model.id.clone();
                                if let Err(err) = self.ensure_model_details(&model_id, true).await {
                                    self.error =
                                        Some(format!("Failed to refresh model info: {}", err));
                                } else {
                                    self.error = None;
                                }
                            }
                        }
                        KeyCode::Char('j') => {
                            if self.show_model_info && self.model_info_viewport_height > 0 {
                                self.model_info_panel
                                    .scroll_down(self.model_info_viewport_height);
                            } else {
                                self.move_model_selection(1);
                            }
                        }
                        KeyCode::Char('k') => {
                            if self.show_model_info && self.model_info_viewport_height > 0 {
                                self.model_info_panel.scroll_up();
                            } else {
                                self.move_model_selection(-1);
                            }
                        }
                        KeyCode::Up => {
                            self.move_model_selection(-1);
                        }
                        KeyCode::Down => {
                            self.move_model_selection(1);
                        }
                        KeyCode::Left => {
                            if let Some(item) = self.current_model_selector_item() {
                                match item.kind() {
                                    ModelSelectorItemKind::Header {
                                        provider, expanded, ..
                                    } => {
                                        if *expanded {
                                            let provider_name = provider.clone();
                                            self.collapse_provider(&provider_name);
                                            self.status =
                                                format!("Collapsed provider: {}", provider_name);
                                            self.error = None;
                                        }
                                    }
                                    ModelSelectorItemKind::Scope { provider, .. } => {
                                        let provider_name = provider.clone();
                                        self.collapse_provider(&provider_name);
                                        self.status =
                                            format!("Collapsed provider: {}", provider_name);
                                        self.error = None;
                                    }
                                    ModelSelectorItemKind::Model { provider, .. } => {
                                        if let Some(idx) = self.index_of_header(provider) {
                                            self.set_selected_model_item(idx);
                                        }
                                    }
                                    ModelSelectorItemKind::Empty { provider, .. } => {
                                        let provider_name = provider.clone();
                                        self.collapse_provider(&provider_name);
                                        self.status =
                                            format!("Collapsed provider: {}", provider_name);
                                        self.error = None;
                                    }
                                }
                            }
                        }
                        KeyCode::Right => {
                            if let Some(item) = self.current_model_selector_item() {
                                match item.kind() {
                                    ModelSelectorItemKind::Header {
                                        provider, expanded, ..
                                    } => {
                                        if !expanded {
                                            let provider_name = provider.clone();
                                            self.expand_provider(&provider_name, true);
                                            self.status =
                                                format!("Expanded provider: {}", provider_name);
                                            self.error = None;
                                        }
                                    }
                                    ModelSelectorItemKind::Empty { provider, .. } => {
                                        let provider_name = provider.clone();
                                        self.expand_provider(&provider_name, false);
                                        self.status =
                                            format!("Expanded provider: {}", provider_name);
                                        self.error = None;
                                    }
                                    _ => {}
                                }
                            }
                        }
                        KeyCode::Char(' ') => {
                            if let Some(item) = self.current_model_selector_item() {
                                if let ModelSelectorItemKind::Header {
                                    provider, expanded, ..
                                } = item.kind()
                                {
                                    if *expanded {
                                        let provider_name = provider.clone();
                                        self.collapse_provider(&provider_name);
                                        self.status =
                                            format!("Collapsed provider: {}", provider_name);
                                    } else {
                                        let provider_name = provider.clone();
                                        self.expand_provider(&provider_name, true);
                                        self.status =
                                            format!("Expanded provider: {}", provider_name);
                                    }
                                    self.error = None;
                                }
                            }
                        }
                        KeyCode::Backspace => {
                            self.pop_model_search_char();
                        }
                        KeyCode::Char('u') if key.modifiers.contains(KeyModifiers::CONTROL) => {
                            self.clear_model_search_query();
                        }
                        KeyCode::Char(c)
                            if key.modifiers.is_empty() || key.modifiers == KeyModifiers::SHIFT =>
                        {
                            self.push_model_search_char(c);
                        }
                        _ => {}
                    },
                    InputMode::Help => match key.code {
                        KeyCode::Esc | KeyCode::Enter | KeyCode::Char('q') | KeyCode::F(1) => {
                            self.set_input_mode(InputMode::Normal);
                            self.help_tab_index = 0; // Reset to first tab
                            self.reset_status();
                        }
                        KeyCode::Tab | KeyCode::Right | KeyCode::Char('l') => {
                            // Next tab
                            if self.help_tab_index + 1 < HELP_TAB_COUNT {
                                self.help_tab_index += 1;
                            }
                        }
                        KeyCode::BackTab | KeyCode::Left | KeyCode::Char('h') => {
                            // Previous tab
                            if self.help_tab_index > 0 {
                                self.help_tab_index -= 1;
                            }
                        }
                        KeyCode::Char(ch) if ch.is_ascii_digit() => {
                            if let Some(idx) = ch.to_digit(10) {
                                if idx >= 1 && (idx as usize) <= HELP_TAB_COUNT {
                                    self.help_tab_index = (idx - 1) as usize;
                                }
                            }
                        }
                        _ => {}
                    },
                    InputMode::SessionBrowser => match key.code {
                        KeyCode::Esc => {
                            self.set_input_mode(InputMode::Normal);
                        }
                        KeyCode::Enter => {
                            // Load selected session
                            if let Some(session) =
                                self.saved_sessions.get(self.selected_session_index)
                            {
                                match self.controller.load_saved_session(session.id).await {
                                    Ok(_) => {
                                        self.status = format!(
                                            "Loaded session: {}",
                                            session.name.as_deref().unwrap_or("Unnamed"),
                                        );
                                        self.error = None;
                                        self.update_thinking_from_last_message();
                                        self.message_line_cache.clear();
                                        self.chat_line_offset = 0;
                                    }
                                    Err(e) => {
                                        self.error = Some(format!("Failed to load session: {}", e));
                                    }
                                }
                            }
                            self.set_input_mode(InputMode::Normal);
                        }
                        KeyCode::Up | KeyCode::Char('k') => {
                            if self.selected_session_index > 0 {
                                self.selected_session_index -= 1;
                            }
                        }
                        KeyCode::Down | KeyCode::Char('j') => {
                            if self.selected_session_index + 1 < self.saved_sessions.len() {
                                self.selected_session_index += 1;
                            }
                        }
                        KeyCode::Char('d') => {
                            // Delete selected session
                            if let Some(session) =
                                self.saved_sessions.get(self.selected_session_index)
                            {
                                match self.controller.delete_session(session.id).await {
                                    Ok(_) => {
                                        self.saved_sessions.remove(self.selected_session_index);
                                        if self.selected_session_index >= self.saved_sessions.len()
                                            && !self.saved_sessions.is_empty()
                                        {
                                            self.selected_session_index =
                                                self.saved_sessions.len() - 1;
                                        }
                                        self.status = "Session deleted".to_string();
                                    }
                                    Err(e) => {
                                        self.error =
                                            Some(format!("Failed to delete session: {}", e));
                                    }
                                }
                            }
                        }
                        _ => {}
                    },
                    InputMode::ThemeBrowser => match key.code {
                        KeyCode::Esc | KeyCode::Char('q') => {
                            self.set_input_mode(InputMode::Normal);
                        }
                        KeyCode::Enter => {
                            // Apply selected theme
                            if let Some(theme_name) = self
                                .available_themes
                                .get(self.selected_theme_index)
                                .cloned()
                            {
                                match self.switch_theme(&theme_name) {
                                    Ok(_) => {
                                        // Success message already set by switch_theme
                                    }
                                    Err(_) => {
                                        // Error message already set by switch_theme
                                    }
                                }
                            }
                            self.set_input_mode(InputMode::Normal);
                        }
                        KeyCode::Up | KeyCode::Char('k') => {
                            if self.selected_theme_index > 0 {
                                self.selected_theme_index -= 1;
                            }
                        }
                        KeyCode::Down | KeyCode::Char('j') => {
                            if self.selected_theme_index + 1 < self.available_themes.len() {
                                self.selected_theme_index += 1;
                            }
                        }
                        KeyCode::Home | KeyCode::Char('g') => {
                            self.selected_theme_index = 0;
                        }
                        KeyCode::End | KeyCode::Char('G') => {
                            if !self.available_themes.is_empty() {
                                self.selected_theme_index = self.available_themes.len() - 1;
                            }
                        }
                        _ => {}
                    },
                }
            }
        }

        Ok(AppState::Running)
    }

    fn handle_mouse_event(&mut self, mouse: MouseEvent) -> Result<AppState> {
        if self.has_pending_consent() {
            return Ok(AppState::Running);
        }

        let region = self.region_for_position(mouse.column, mouse.row);

        match mouse.kind {
            MouseEventKind::ScrollUp => {
                if let Some(region) = region {
                    self.handle_mouse_scroll(region, -MOUSE_SCROLL_STEP);
                }
            }
            MouseEventKind::ScrollDown => {
                if let Some(region) = region {
                    self.handle_mouse_scroll(region, MOUSE_SCROLL_STEP);
                }
            }
            MouseEventKind::Down(MouseButton::Left) => {
                self.pending_key = None;
                if let Some(region) = region {
                    self.handle_mouse_click(region, mouse.column, mouse.row);
                }
            }
            MouseEventKind::Drag(MouseButton::Left) => {
                if matches!(region, Some(UiRegion::Input)) {
                    self.pending_key = None;
                    self.handle_mouse_click(UiRegion::Input, mouse.column, mouse.row);
                }
            }
            _ => {}
        }

        Ok(AppState::Running)
    }

    fn handle_mouse_scroll(&mut self, region: UiRegion, amount: isize) {
        if amount == 0 {
            return;
        }

        match region {
            UiRegion::FileTree => {
                if self.focus_panel(FocusedPanel::Files) {
                    self.file_tree_mut().move_cursor(amount);
                }
            }
            UiRegion::Thinking | UiRegion::Actions => {
                if self.focus_panel(FocusedPanel::Thinking) {
                    let viewport = self.thinking_viewport_height.max(1);
                    self.thinking_scroll.on_user_scroll(amount, viewport);
                }
            }
            UiRegion::Code => {
                if self.focus_panel(FocusedPanel::Code) {
                    let viewport = self.code_view_viewport_height().max(1);
                    if let Some(scroll) = self.code_view_scroll_mut() {
                        scroll.on_user_scroll(amount, viewport);
                    }
                }
            }
            UiRegion::ModelInfo => {
                self.scroll_model_info(amount);
            }
            UiRegion::Input => {}
            UiRegion::System
            | UiRegion::Status
            | UiRegion::Chat
            | UiRegion::Content
            | UiRegion::Frame
            | UiRegion::Header => {
                if self.focus_panel(FocusedPanel::Chat) {
                    self.auto_scroll
                        .on_user_scroll(amount, self.viewport_height);
                    self.update_new_message_alert_after_scroll();
                }
            }
        }
    }

    fn handle_mouse_click(&mut self, region: UiRegion, column: u16, row: u16) {
        match region {
            UiRegion::FileTree => {
                self.focus_panel(FocusedPanel::Files);
                self.set_input_mode(InputMode::Normal);
            }
            UiRegion::Thinking | UiRegion::Actions => {
                if self.focus_panel(FocusedPanel::Thinking) {
                    self.set_input_mode(InputMode::Normal);
                }
            }
            UiRegion::Code => {
                if self.focus_panel(FocusedPanel::Code) {
                    self.set_input_mode(InputMode::Normal);
                }
            }
            UiRegion::Input => {
                self.focus_panel(FocusedPanel::Input);
                self.set_input_mode(InputMode::Editing);
                if let Some(rect) = self.last_layout.input_panel {
                    if let Some((line, column)) = self.input_cursor_from_point(rect, column, row) {
                        let line = line.min(u16::MAX as usize) as u16;
                        let column = column.min(u16::MAX as usize) as u16;
                        self.textarea.move_cursor(CursorMove::Jump(line, column));
                    }
                }
            }
            UiRegion::ModelInfo => {
                self.set_input_mode(InputMode::Normal);
            }
            UiRegion::System
            | UiRegion::Status
            | UiRegion::Chat
            | UiRegion::Content
            | UiRegion::Frame
            | UiRegion::Header => {
                self.focus_panel(FocusedPanel::Chat);
                self.set_input_mode(InputMode::Normal);
            }
        }
    }

    fn input_cursor_from_point(&self, rect: Rect, column: u16, row: u16) -> Option<(usize, usize)> {
        let lines = self.textarea.lines();
        if lines.is_empty() {
            return Some((0, 0));
        }

        let inner_x = usize::from(column.saturating_sub(rect.x.saturating_add(1)));
        let inner_y = usize::from(row.saturating_sub(rect.y.saturating_add(1)));

        let max_line = lines.len().saturating_sub(1);
        let line_index = inner_y.min(max_line);
        let column_index = Self::grapheme_index_for_visual_offset(&lines[line_index], inner_x);
        Some((line_index, column_index))
    }

    fn scroll_model_info(&mut self, amount: isize) {
        if amount == 0 {
            return;
        }

        let steps = amount.unsigned_abs();
        let viewport = self.model_info_viewport_height.max(1);
        if amount.is_positive() {
            for _ in 0..steps {
                self.model_info_panel.scroll_down(viewport);
            }
        } else {
            for _ in 0..steps {
                self.model_info_panel.scroll_up();
            }
        }
    }

    fn grapheme_index_for_visual_offset(line: &str, offset: usize) -> usize {
        let mut width = 0usize;
        for (idx, grapheme) in line.graphemes(true).enumerate() {
            let grapheme_width = UnicodeWidthStr::width(grapheme);
            if width + grapheme_width > offset {
                return idx;
            }
            width += grapheme_width;
        }
        line.graphemes(true).count()
    }

    /// Call this when processing scroll up/down keys
    pub fn on_scroll(&mut self, delta: isize) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.on_user_scroll(delta, self.viewport_height);
                self.update_new_message_alert_after_scroll();
            }
            FocusedPanel::Thinking => {
                // Ensure we have a valid viewport height
                let viewport_height = self.thinking_viewport_height.max(1);
                self.thinking_scroll.on_user_scroll(delta, viewport_height);
            }
            FocusedPanel::Files => {
                self.file_tree_mut().move_cursor(delta);
            }
            FocusedPanel::Code => {
                let viewport_height = self.code_view_viewport_height().max(1);
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.on_user_scroll(delta, viewport_height);
                }
            }
            FocusedPanel::Input => {
                // Input panel doesn't scroll
            }
        }
    }

    /// Scroll down half page
    pub fn scroll_half_page_down(&mut self) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.scroll_half_page_down(self.viewport_height);
                self.update_new_message_alert_after_scroll();
            }
            FocusedPanel::Thinking => {
                let viewport_height = self.thinking_viewport_height.max(1);
                self.thinking_scroll.scroll_half_page_down(viewport_height);
            }
            FocusedPanel::Files => {
                self.file_tree_mut().page_down();
            }
            FocusedPanel::Code => {
                let viewport_height = self.code_view_viewport_height().max(1);
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.scroll_half_page_down(viewport_height);
                }
            }
            FocusedPanel::Input => {}
        }
    }

    /// Scroll up half page
    pub fn scroll_half_page_up(&mut self) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.scroll_half_page_up(self.viewport_height);
                self.update_new_message_alert_after_scroll();
            }
            FocusedPanel::Thinking => {
                let viewport_height = self.thinking_viewport_height.max(1);
                self.thinking_scroll.scroll_half_page_up(viewport_height);
            }
            FocusedPanel::Files => {
                self.file_tree_mut().page_up();
            }
            FocusedPanel::Code => {
                let viewport_height = self.code_view_viewport_height().max(1);
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.scroll_half_page_up(viewport_height);
                }
            }
            FocusedPanel::Input => {}
        }
    }

    /// Scroll down full page
    pub fn scroll_full_page_down(&mut self) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.scroll_full_page_down(self.viewport_height);
                self.update_new_message_alert_after_scroll();
            }
            FocusedPanel::Thinking => {
                let viewport_height = self.thinking_viewport_height.max(1);
                self.thinking_scroll.scroll_full_page_down(viewport_height);
            }
            FocusedPanel::Files => {
                self.file_tree_mut().page_down();
            }
            FocusedPanel::Code => {
                let viewport_height = self.code_view_viewport_height().max(1);
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.scroll_full_page_down(viewport_height);
                }
            }
            FocusedPanel::Input => {}
        }
    }

    /// Scroll up full page
    pub fn scroll_full_page_up(&mut self) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.scroll_full_page_up(self.viewport_height);
                self.update_new_message_alert_after_scroll();
            }
            FocusedPanel::Thinking => {
                let viewport_height = self.thinking_viewport_height.max(1);
                self.thinking_scroll.scroll_full_page_up(viewport_height);
            }
            FocusedPanel::Files => {
                self.file_tree_mut().page_up();
            }
            FocusedPanel::Code => {
                let viewport_height = self.code_view_viewport_height().max(1);
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.scroll_full_page_up(viewport_height);
                }
            }
            FocusedPanel::Input => {}
        }
    }

    /// Jump to top of focused panel
    pub fn jump_to_top(&mut self) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.jump_to_top();
                self.chat_cursor = (0, 0);
            }
            FocusedPanel::Thinking => {
                self.thinking_scroll.jump_to_top();
            }
            FocusedPanel::Files => {
                self.file_tree_mut().jump_to_top();
            }
            FocusedPanel::Code => {
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.jump_to_top();
                }
            }
            FocusedPanel::Input => {}
        }
    }

    /// Jump to bottom of focused panel
    pub fn jump_to_bottom(&mut self) {
        match self.focused_panel {
            FocusedPanel::Chat => {
                self.auto_scroll.jump_to_bottom(self.viewport_height);
                self.update_new_message_alert_after_scroll();
                let rendered = self.get_rendered_lines();
                if rendered.is_empty() {
                    self.chat_cursor = (0, 0);
                } else {
                    let last_index = rendered.len().saturating_sub(1);
                    let last_col = rendered
                        .last()
                        .map(|line| line.chars().count())
                        .unwrap_or(0);
                    self.chat_cursor = (last_index, last_col);
                }
            }
            FocusedPanel::Thinking => {
                let viewport_height = self.thinking_viewport_height.max(1);
                self.thinking_scroll.jump_to_bottom(viewport_height);
            }
            FocusedPanel::Files => {
                self.file_tree_mut().jump_to_bottom();
            }
            FocusedPanel::Code => {
                let viewport_height = self.code_view_viewport_height().max(1);
                if let Some(scroll) = self.code_view_scroll_mut() {
                    scroll.jump_to_bottom(viewport_height);
                }
            }
            FocusedPanel::Input => {}
        }
    }

    pub async fn handle_session_event(&mut self, event: SessionEvent) -> Result<()> {
        match event {
            SessionEvent::StreamChunk {
                message_id,
                response,
            } => {
                self.controller.apply_stream_chunk(message_id, &response)?;
                self.invalidate_message_cache(&message_id);

                // Update thinking content in real-time during streaming
                self.update_thinking_from_last_message();
                self.notify_new_activity();

                // Auto-scroll will handle this in the render loop
                if response.is_final {
                    let recorded_snapshot = match response.usage.as_ref() {
                        Some(usage) => {
                            self.update_context_usage(usage);
                            self.controller.record_usage_sample(usage).await
                        }
                        None => None,
                    };
                    if let Some(snapshot) = recorded_snapshot {
                        self.usage_snapshot = Some(snapshot.clone());
                        self.update_usage_toasts(&snapshot);
                    } else {
                        self.refresh_usage_summary().await?;
                    }

                    self.streaming.remove(&message_id);
                    self.stream_tasks.remove(&message_id);
                    self.stop_loading_animation();

                    // Check if the completed stream has tool calls that need execution
                    if let Some(tool_calls) = self.controller.check_streaming_tool_calls(message_id)
                    {
                        // Trigger tool execution via event
                        let sender = self.session_tx.clone();
                        let _ = sender.send(SessionEvent::ToolExecutionNeeded {
                            message_id,
                            tool_calls,
                        });
                    } else {
                        self.status = "Ready".to_string();
                    }
                }
            }
            SessionEvent::StreamError {
                message_id,
                message,
            } => {
                self.stop_loading_animation();
                if let Some(id) = message_id {
                    self.streaming.remove(&id);
                    self.stream_tasks.remove(&id);
                    self.invalidate_message_cache(&id);
                } else {
                    self.streaming.clear();
                    self.stream_tasks.clear();
                    self.message_line_cache.clear();
                }
                self.error = Some(message);
            }
            SessionEvent::ToolExecutionNeeded {
                message_id,
                tool_calls,
            } => {
                // Store tool execution for async processing on next event loop iteration
                self.pending_tool_execution = Some((message_id, tool_calls));
            }
            SessionEvent::AgentUpdate { content } => {
                // Update agent actions panel with latest ReAct iteration
                self.set_agent_actions(content);
            }
            SessionEvent::AgentCompleted { answer } => {
                // Agent finished, add final answer to conversation
                self.controller
                    .conversation_mut()
                    .push_assistant_message(answer);
                self.notify_new_activity();
                self.agent_running = false;
                self.agent_mode = false;
                self.agent_actions = None;
                self.status = "Agent completed successfully".to_string();
                self.stop_loading_animation();
            }
            SessionEvent::AgentFailed { error } => {
                // Agent failed, show error
                self.error = Some(format!("Agent failed: {}", error));
                self.agent_running = false;
                self.agent_actions = None;
                self.stop_loading_animation();
            }
            SessionEvent::OAuthPoll {
                server,
                authorization,
            } => {
                match self
                    .controller
                    .poll_oauth_device_flow(&server, &authorization)
                    .await
                {
                    Ok(DevicePollState::Pending { retry_in }) => {
                        self.oauth_flows
                            .insert(server.clone(), authorization.clone());
                        let server_name = server.clone();
                        self.schedule_oauth_poll(server, authorization, retry_in);
                        self.status = format!("Waiting for OAuth approval for {server_name}...");
                    }
                    Ok(DevicePollState::Complete(_token)) => {
                        self.oauth_flows.remove(&server);
                        self.push_toast(
                            ToastLevel::Success,
                            format!("OAuth authorization complete for {server}."),
                        );
                        self.status = format!("OAuth authorization complete for {server}.");
                        if let Err(err) = self.refresh_resource_catalog().await {
                            self.push_toast(
                                ToastLevel::Error,
                                format!("Failed to refresh MCP resources: {err}"),
                            );
                        }
                        if let Err(err) = self.refresh_mcp_slash_commands().await {
                            self.push_toast(
                                ToastLevel::Error,
                                format!("Failed to refresh MCP slash commands: {err}"),
                            );
                        }
                    }
                    Err(err) => {
                        self.oauth_flows.remove(&server);
                        self.error = Some(format!("OAuth flow for '{server}' failed: {err}"));
                        self.push_toast(
                            ToastLevel::Error,
                            format!("OAuth failure for {server}: {err}"),
                        );
                    }
                }
            }
        }
        Ok(())
    }

    fn reset_status(&mut self) {
        self.status = "Normal mode • Press F1 for help".to_string();
        self.error = None;
    }

    async fn refresh_usage_summary(&mut self) -> Result<()> {
        if let Some(snapshot) = self.controller.current_usage_snapshot().await {
            self.usage_snapshot = Some(snapshot.clone());
            self.update_usage_toasts(&snapshot);
        } else {
            self.usage_snapshot = None;
        }
        Ok(())
    }

    fn update_usage_toasts(&mut self, snapshot: &UsageSnapshot) {
        for window in [UsageWindow::Hour, UsageWindow::Week] {
            let key = (snapshot.provider.clone(), window);
            let metrics = snapshot.window(window);
            let quota = match metrics.quota_tokens {
                Some(value) if value > 0 => value,
                _ => {
                    self.usage_thresholds.remove(&key);
                    continue;
                }
            };

            let previous = self
                .usage_thresholds
                .get(&key)
                .copied()
                .unwrap_or(UsageBand::Normal);
            let current = metrics.band();

            if current > previous {
                if let Some(percent_ratio) = metrics.percent_of_quota() {
                    let percent_value = percent_ratio * 100.0;
                    let percent_text = Self::format_percent_value(percent_value.min(999.9));
                    let quota_text = format_token_short(quota);
                    let used_text = format_token_short(metrics.total_tokens);
                    let provider_display = Self::provider_display_name(&snapshot.provider);
                    let window_label = Self::usage_window_label(window);
                    let message = format!(
                        "{} {} usage at {}% ({}/{})",
                        provider_display, window_label, percent_text, used_text, quota_text
                    );
                    let level = if current == UsageBand::Critical {
                        ToastLevel::Error
                    } else {
                        ToastLevel::Warning
                    };
                    self.push_toast(level, message);
                }
            } else if current == UsageBand::Normal && previous != UsageBand::Normal {
                self.usage_thresholds.insert(key.clone(), UsageBand::Normal);
            }

            self.usage_thresholds.insert(key, current);
        }
    }

    async fn show_usage_limits(&mut self) -> Result<()> {
        let snapshots = self.controller.usage_overview().await;
        if snapshots.is_empty() {
            let message = "Usage: no data recorded yet.".to_string();
            self.status = message.clone();
            self.error = None;
            self.push_toast(ToastLevel::Info, message);
            return Ok(());
        }

        let mut parts = Vec::new();
        let mut current_snapshot: Option<UsageSnapshot> = None;

        for snapshot in snapshots.iter() {
            if snapshot.provider == self.current_provider {
                current_snapshot = Some(snapshot.clone());
            }
            self.update_usage_toasts(snapshot);

            let provider_display = Self::provider_display_name(&snapshot.provider);
            let hour = Self::summarize_usage_window("hour", snapshot.window(UsageWindow::Hour));
            let week = Self::summarize_usage_window("week", snapshot.window(UsageWindow::Week));
            parts.push(format!("{provider_display}: {hour}; {week}"));
        }

        if let Some(snapshot) = current_snapshot {
            self.usage_snapshot = Some(snapshot);
        }

        let message = parts.join(" | ");
        self.status = format!("Usage • {message}");
        self.error = None;
        self.push_toast(ToastLevel::Info, message.clone());

        Ok(())
    }

    fn summarize_usage_window(label: &str, metrics: &WindowMetrics) -> String {
        let used = format_token_short(metrics.total_tokens);
        if let Some(quota) = metrics.quota_tokens {
            if quota == 0 {
                return format!("{label} {used} tokens");
            }
            let quota_text = format_token_short(quota);
            let percent = metrics
                .percent_of_quota()
                .map(|ratio| ratio * 100.0)
                .unwrap_or(0.0);
            let percent_text = Self::format_percent_value(percent.min(999.9));
            format!("{label} {used}/{quota_text} ({percent_text}%)")
        } else {
            format!("{label} {used} tokens")
        }
    }

    fn usage_window_label(window: UsageWindow) -> &'static str {
        match window {
            UsageWindow::Hour => "hourly",
            UsageWindow::Week => "weekly",
        }
    }

    fn format_percent_value(percent: f64) -> String {
        if percent >= 100.0 || percent == 0.0 {
            format!("{percent:.0}")
        } else if percent >= 10.0 {
            format!("{percent:.0}")
        } else {
            format!("{percent:.1}")
        }
    }

    async fn collect_models_from_all_providers(
        &self,
    ) -> (
        Vec<ModelInfo>,
        Vec<String>,
        HashMap<String, ProviderScopeStatus>,
    ) {
        let provider_entries = {
            let config = self.controller.config();
            let entries: Vec<(String, ProviderConfig)> = config
                .providers
                .iter()
                .map(|(name, cfg)| (name.clone(), cfg.clone()))
                .collect();
            entries
        };

        let mut models = Vec::new();
        let mut errors = Vec::new();
        let mut scope_status_map: HashMap<String, ProviderScopeStatus> = HashMap::new();

        let workspace_root = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
            .join("../..")
            .canonicalize()
            .ok();
        let server_binary = workspace_root.as_ref().and_then(|root| {
            let candidates = [
                "target/debug/owlen-mcp-llm-server",
                "target/release/owlen-mcp-llm-server",
            ];
            candidates
                .iter()
                .map(|rel| root.join(rel))
                .find(|p| p.exists())
                .map(|p| p.to_string_lossy().into_owned())
        });

        for (name, provider_cfg) in provider_entries {
            let provider_type = provider_cfg.provider_type.to_ascii_lowercase();
            if provider_type != "ollama" && provider_type != "ollama_cloud" {
                continue;
            }

            if !provider_cfg.enabled {
                continue;
            }

            let canonical_name = Self::canonical_provider_id(&name);

            // All providers communicate via MCP LLM server (Phase 10).
            // Select provider by name via OWLEN_PROVIDER so per-provider settings apply.
            let mut env_vars = HashMap::new();
            env_vars.insert("OWLEN_PROVIDER".to_string(), canonical_name.clone());

            let client_result = if let Some(binary_path) = server_binary.as_ref() {
                use owlen_core::config::McpServerConfig;

                let config = McpServerConfig {
                    name: format!("provider::{canonical_name}"),
                    command: binary_path.clone(),
                    args: Vec::new(),
                    transport: "stdio".to_string(),
                    env: env_vars.clone(),
                    oauth: None,
                };
                RemoteMcpClient::new_with_config(&config)
            } else {
                // Fallback to legacy discovery: temporarily set env vars while spawning.
                Self::with_temp_env_vars(&env_vars, RemoteMcpClient::new)
            };

            match client_result {
                Ok(client) => {
                    let client: Arc<dyn LlmClient> = Arc::new(client);
                    match client.list_models().await {
                        Ok(mut provider_models) => {
                            for model in &mut provider_models {
                                model.provider = canonical_name.clone();
                            }
                            let statuses = Self::extract_scope_status(&provider_models);
                            Self::accumulate_scope_errors(&mut errors, &canonical_name, &statuses);
                            scope_status_map.insert(canonical_name.clone(), statuses);
                            models.extend(provider_models);
                        }
                        Err(err) => {
                            scope_status_map
                                .insert(canonical_name.clone(), ProviderScopeStatus::default());
                            errors.push(format!("{}: {}", name, err))
                        }
                    }
                }
                Err(err) => {
                    scope_status_map.insert(canonical_name.clone(), ProviderScopeStatus::default());
                    errors.push(format!("{}: {}", canonical_name, err));
                }
            }
        }

        // Sort models alphabetically by name for a predictable UI order
        models.sort_by(|a, b| a.name.to_lowercase().cmp(&b.name.to_lowercase()));
        (models, errors, scope_status_map)
    }

    fn scope_from_keyword(value: &str) -> ModelScope {
        match value {
            "local" => ModelScope::Local,
            "cloud" => ModelScope::Cloud,
            other => ModelScope::Other(other.to_string()),
        }
    }

    fn extract_scope_status(models: &[ModelInfo]) -> ProviderScopeStatus {
        let mut statuses: ProviderScopeStatus = BTreeMap::new();

        for model in models {
            for capability in &model.capabilities {
                if let Some(rest) = capability.strip_prefix("scope-status:") {
                    let mut parts = rest.split(':');
                    let scope_key = parts.next().unwrap_or_default().to_ascii_lowercase();
                    let state_key = parts.next().unwrap_or_default().to_ascii_lowercase();

                    let scope = Self::scope_from_keyword(&scope_key);
                    let state = match state_key.as_str() {
                        "available" => ModelAvailabilityState::Available,
                        "unavailable" => ModelAvailabilityState::Unavailable,
                        _ => ModelAvailabilityState::Unknown,
                    };

                    let entry = statuses.entry(scope).or_default();
                    if state > entry.state || entry.state == ModelAvailabilityState::Unknown {
                        entry.state = state;
                    }
                } else if let Some(rest) = capability.strip_prefix("scope-status-message:") {
                    let mut parts = rest.split(':');
                    let scope_key = parts.next().unwrap_or_default().to_ascii_lowercase();
                    let message = parts.collect::<Vec<_>>().join(":");
                    let scope = Self::scope_from_keyword(&scope_key);
                    let entry = statuses.entry(scope).or_default();
                    if entry.message.is_none() && !message.trim().is_empty() {
                        entry.message = Some(message.trim().to_string());
                    }
                } else if let Some(rest) = capability.strip_prefix("scope-status-age:") {
                    let mut parts = rest.split(':');
                    let scope_key = parts.next().unwrap_or_default().to_ascii_lowercase();
                    let value = parts.next().unwrap_or_default();
                    if let Ok(age) = value.parse::<u64>() {
                        let scope = Self::scope_from_keyword(&scope_key);
                        let entry = statuses.entry(scope).or_default();
                        entry.last_checked_secs = Some(age);
                    }
                } else if let Some(rest) = capability.strip_prefix("scope-status-success-age:") {
                    let mut parts = rest.split(':');
                    let scope_key = parts.next().unwrap_or_default().to_ascii_lowercase();
                    let value = parts.next().unwrap_or_default();
                    if let Ok(age) = value.parse::<u64>() {
                        let scope = Self::scope_from_keyword(&scope_key);
                        let entry = statuses.entry(scope).or_default();
                        entry.last_success_secs = Some(age);
                    }
                } else if let Some(rest) = capability.strip_prefix("scope-status-stale:") {
                    let mut parts = rest.split(':');
                    let scope_key = parts.next().unwrap_or_default().to_ascii_lowercase();
                    let value = parts.next().unwrap_or_default();
                    let scope = Self::scope_from_keyword(&scope_key);
                    let entry = statuses.entry(scope).or_default();
                    entry.is_stale = matches!(value, "1" | "true" | "True" | "TRUE");
                }
            }
        }

        statuses
    }

    fn accumulate_scope_errors(
        errors: &mut Vec<String>,
        provider: &str,
        statuses: &ProviderScopeStatus,
    ) {
        for (scope, entry) in statuses {
            if entry.state == ModelAvailabilityState::Unavailable {
                let scope_name = Self::scope_display_name(scope);
                if let Some(summary) = Self::scope_status_summary(entry) {
                    errors.push(format!("{provider}: {scope_name} {summary}"));
                } else {
                    errors.push(format!("{provider}: {scope_name} unavailable"));
                }
            } else if entry.state == ModelAvailabilityState::Available && entry.is_stale {
                let scope_name = Self::scope_display_name(scope);
                let summary = Self::scope_status_summary(entry)
                    .unwrap_or_else(|| "using cached results".to_string());
                errors.push(format!("{provider}: {scope_name} degraded ({summary})"));
            }
        }
    }

    pub(crate) fn model_scope_from_capabilities(model: &ModelInfo) -> ModelScope {
        for capability in &model.capabilities {
            if let Some(tag) = capability.strip_prefix("scope:") {
                return match tag {
                    "local" => ModelScope::Local,
                    "cloud" => ModelScope::Cloud,
                    other => ModelScope::Other(other.to_string()),
                };
            }
        }

        ModelScope::Other("unknown".to_string())
    }

    pub(crate) fn scope_icon(scope: &ModelScope) -> &'static str {
        match scope {
            ModelScope::Local => "🖥️",
            ModelScope::Cloud => "☁",
            ModelScope::Other(_) => "◇",
        }
    }

    pub(crate) fn scope_display_name(scope: &ModelScope) -> String {
        match scope {
            ModelScope::Local => "Local".to_string(),
            ModelScope::Cloud => "Cloud".to_string(),
            ModelScope::Other(other) => capitalize_first(other),
        }
    }

    fn format_duration_short(seconds: u64) -> String {
        const MINUTE: u64 = 60;
        const HOUR: u64 = 60 * MINUTE;
        const DAY: u64 = 24 * HOUR;

        if seconds < MINUTE {
            format!("{seconds}s")
        } else if seconds < HOUR {
            format!("{}m", seconds / MINUTE)
        } else if seconds < DAY {
            let hours = seconds / HOUR;
            let minutes = (seconds % HOUR) / MINUTE;
            if minutes == 0 {
                format!("{hours}h")
            } else {
                format!("{hours}h{minutes}m")
            }
        } else {
            format!("{}d", seconds / DAY)
        }
    }

    fn scope_status_summary(status: &ScopeStatusEntry) -> Option<String> {
        let mut segments: Vec<String> = Vec::new();

        if let Some(message) = status.message.as_ref() {
            if !message.is_empty() {
                segments.push(message.clone());
            }
        } else if status.state == ModelAvailabilityState::Unavailable {
            segments.push("Unavailable".to_string());
        } else if status.state == ModelAvailabilityState::Available && status.is_stale {
            segments.push("Using cached results".to_string());
        }

        if let Some(age) = status.last_checked_secs {
            segments.push(format!("checked {} ago", Self::format_duration_short(age)));
        }

        if let Some(success_age) = status.last_success_secs {
            if status.state == ModelAvailabilityState::Unavailable {
                segments.push(format!(
                    "last ok {} ago",
                    Self::format_duration_short(success_age)
                ));
            } else if status.state == ModelAvailabilityState::Available && status.is_stale {
                segments.push(format!(
                    "last refresh {} ago",
                    Self::format_duration_short(success_age)
                ));
            }
        }

        if segments.is_empty() {
            None
        } else {
            Some(segments.join(" · "))
        }
    }

    fn scope_header_label(
        scope: &ModelScope,
        status: &ScopeStatusEntry,
        filter: FilterMode,
    ) -> String {
        let icon = Self::scope_icon(scope);
        let scope_name = Self::scope_display_name(scope);
        let mut label = format!("{icon} {scope_name}");

        match status.state {
            ModelAvailabilityState::Available => {
                label.push_str(" · ✓");
                if status.is_stale {
                    label.push_str(" · ⚠");
                }
            }
            ModelAvailabilityState::Unavailable => {
                if status.last_success_secs.is_some() {
                    label.push_str(" · ⚠");
                } else {
                    label.push_str(" · ✗");
                }
            }
            ModelAvailabilityState::Unknown => label.push_str(" · ⚙"),
        }

        if let Some(age) = status.last_checked_secs {
            label.push_str(&format!(" · {}", Self::format_duration_short(age)));
        }

        if matches!(filter, FilterMode::Available) {
            label.push_str(" · available only");
        }

        label
    }

    fn deduplicate_models_for_scope<'a>(
        entries: Vec<(usize, &'a ModelInfo)>,
        provider_lower: &str,
        scope: &ModelScope,
    ) -> Vec<(usize, &'a ModelInfo)> {
        let mut best_by_canonical: HashMap<String, (i8, (usize, &'a ModelInfo))> = HashMap::new();

        for (idx, model) in entries {
            let canonical = model.id.to_string();
            let is_cloud_id = model.id.ends_with("-cloud");
            let priority = if matches!(
                provider_lower,
                "ollama" | "ollama_local" | "ollama-cloud" | "ollama_cloud"
            ) {
                match scope {
                    ModelScope::Local => {
                        if is_cloud_id {
                            1
                        } else {
                            2
                        }
                    }
                    ModelScope::Cloud => {
                        if is_cloud_id {
                            2
                        } else {
                            1
                        }
                    }
                    ModelScope::Other(_) => 1,
                }
            } else {
                1
            };

            best_by_canonical
                .entry(canonical)
                .and_modify(|entry| {
                    if priority > entry.0 || (priority == entry.0 && model.id < entry.1.1.id) {
                        *entry = (priority, (idx, model));
                    }
                })
                .or_insert((priority, (idx, model)));
        }

        let mut matches: Vec<(usize, &'a ModelInfo)> = best_by_canonical
            .into_values()
            .map(|entry| entry.1)
            .collect();

        matches.sort_by(|(_, a), (_, b)| a.id.cmp(&b.id));
        matches
    }

    fn recompute_available_providers(&mut self) {
        let mut providers: BTreeSet<String> = self
            .controller
            .config()
            .providers
            .iter()
            .filter(|(_, cfg)| cfg.enabled)
            .map(|(name, _)| Self::canonical_provider_id(name))
            .collect();

        providers.extend(self.models.iter().map(|m| m.provider.clone()));

        if providers.is_empty() {
            providers.insert(self.selected_provider.clone());
        }

        if providers.is_empty() {
            providers.insert("ollama_local".to_string());
        }

        self.available_providers = providers.into_iter().collect();
    }

    fn canonical_provider_id(provider: &str) -> String {
        let normalized = provider.trim().to_ascii_lowercase();
        if normalized.is_empty() {
            return "ollama_local".to_string();
        }
        match normalized.replace('-', "_").as_str() {
            "ollama" => "ollama_local".to_string(),
            "ollama_local" => "ollama_local".to_string(),
            "ollama_cloud" => "ollama_cloud".to_string(),
            other => other.to_string(),
        }
    }

    fn with_temp_env_vars<T, F>(env_vars: &HashMap<String, String>, action: F) -> T
    where
        F: FnOnce() -> T,
    {
        let backups: Vec<(String, Option<String>)> = env_vars
            .keys()
            .map(|key| (key.clone(), std::env::var(key).ok()))
            .collect();

        for (key, value) in env_vars {
            // Safety: environment mutations are scoped to this synchronous call and restored
            // immediately afterwards, so no other threads observe inconsistent state.
            unsafe {
                std::env::set_var(key, value);
            }
        }

        let result = action();

        for (key, original) in backups {
            unsafe {
                if let Some(value) = original {
                    std::env::set_var(&key, value);
                } else {
                    std::env::remove_var(&key);
                }
            }
        }

        result
    }

    fn rebuild_annotated_models(&mut self) {
        let mut annotated = Vec::with_capacity(self.models.len());
        for model in &self.models {
            let provider_id = model.provider.clone();
            let scope = Self::model_scope_from_capabilities(model);
            let scope_state = self.provider_scope_state(provider_id.as_str(), &scope);
            let provider_status = Self::provider_status_from_state(scope_state);
            let provider_type = Self::infer_provider_type(&provider_id, &scope);

            let mut provider_metadata = ProviderMetadata::new(
                provider_id.clone(),
                Self::provider_display_name(&provider_id),
                provider_type,
                matches!(provider_type, ProviderType::Cloud),
            );
            provider_metadata.metadata.insert(
                "scope".to_string(),
                Value::String(Self::scope_display_name(&scope)),
            );
            provider_metadata.metadata.insert(
                "provider_tag".to_string(),
                Value::String(Self::provider_tag(&provider_id)),
            );

            let mut model_metadata = HashMap::new();
            model_metadata.insert(
                "display_name".to_string(),
                Value::String(Self::display_name_for_model(model)),
            );
            if let Some(ctx) = model.context_window {
                model_metadata.insert("context_window".to_string(), Value::from(ctx));
            }
            model_metadata.insert(
                "provider_tag".to_string(),
                Value::String(Self::provider_tag(&provider_id)),
            );

            let provider_model = ProviderModelInfo {
                name: model.id.clone(),
                size_bytes: None,
                capabilities: model.capabilities.clone(),
                description: model.description.clone(),
                provider: provider_metadata,
                metadata: model_metadata,
            };

            annotated.push(AnnotatedModelInfo {
                provider_id,
                provider_status,
                model: provider_model,
            });
        }

        self.annotated_models = annotated;
    }

    fn rebuild_model_selector_items(&mut self) {
        let mut items = Vec::new();
        self.model_search_hits.clear();
        self.provider_search_hits.clear();
        self.visible_model_count = 0;

        if self.available_providers.is_empty() {
            items.push(ModelSelectorItem::header(
                "ollama_local",
                false,
                ProviderStatus::RequiresSetup,
                ProviderType::Local,
            ));
            self.model_selector_items = items;
            return;
        }

        let search_query = self.model_search_query.trim().to_string();
        let search_active = !search_query.is_empty();
        let force_expand = search_active;
        let expanded = self.expanded_provider.clone();

        for provider in &self.available_providers {
            let provider_lower = provider.to_ascii_lowercase();
            let provider_display = Self::provider_display_name(provider);
            let provider_status = self.provider_overall_status(provider);
            let provider_type = self.provider_type_for(provider);
            let provider_highlight = if search_active {
                search_candidate(provider_display.as_str(), &search_query).map(|(_, mask)| mask)
            } else {
                None
            };
            if let Some(mask) = provider_highlight.clone() {
                self.provider_search_hits.insert(provider.clone(), mask);
            }

            let is_expanded =
                force_expand || expanded.as_ref().map(|p| p == provider).unwrap_or(false);

            let mut provider_block = Vec::new();
            provider_block.push(ModelSelectorItem::header(
                provider.clone(),
                is_expanded,
                provider_status,
                provider_type,
            ));

            if !is_expanded {
                items.extend(provider_block);
                continue;
            }

            let status_map = self.provider_scope_status.get(provider);

            let mut scoped: BTreeMap<ModelScope, Vec<(usize, &ModelInfo)>> = BTreeMap::new();
            for (idx, model) in self.models.iter().enumerate() {
                if &model.provider == provider {
                    let scope = Self::model_scope_from_capabilities(model);
                    scoped.entry(scope).or_default().push((idx, model));
                }
            }

            let mut scopes_to_render: BTreeSet<ModelScope> = BTreeSet::new();
            scopes_to_render.extend(scoped.keys().cloned());
            if let Some(statuses) = status_map {
                scopes_to_render.extend(statuses.keys().cloned());
            }

            let mut rendered_scope = false;
            let mut rendered_body = false;
            let mut provider_has_models = false;

            for scope in scopes_to_render {
                if !self.filter_allows_scope(&scope) {
                    continue;
                }

                let entries = scoped.get(&scope).cloned().unwrap_or_default();
                let deduped = Self::deduplicate_models_for_scope(entries, &provider_lower, &scope);

                let status_entry = status_map
                    .and_then(|map| map.get(&scope))
                    .cloned()
                    .unwrap_or_default();

                let mut filtered: Vec<(usize, &ModelInfo)> = Vec::new();
                for (idx, model) in deduped {
                    let search_info = if search_active {
                        self.evaluate_model_search(provider, model, &search_query)
                    } else {
                        None
                    };

                    if let Some(info) = search_info {
                        self.model_search_hits.insert(idx, info);
                        filtered.push((idx, model));
                    } else if !search_active {
                        filtered.push((idx, model));
                    }
                }

                if search_active && filtered.is_empty() {
                    continue;
                }

                rendered_scope = true;

                let label = Self::scope_header_label(&scope, &status_entry, self.model_filter_mode);
                provider_block.push(ModelSelectorItem::scope(
                    provider.clone(),
                    label,
                    scope.clone(),
                    status_entry.state,
                ));

                if status_entry.state != ModelAvailabilityState::Available
                    || status_entry.is_stale
                    || status_entry.message.is_some()
                {
                    if let Some(summary) = Self::scope_status_summary(&status_entry) {
                        provider_block.push(ModelSelectorItem::empty(
                            provider.clone(),
                            Some(summary),
                            Some(status_entry.state),
                        ));
                        rendered_body = true;
                    }
                }

                let scope_allowed = self.filter_scope_allows_models(&scope, &status_entry);

                if filtered.is_empty() {
                    if !scope_allowed {
                        if let Some(msg) = self.scope_filter_message(&scope, &status_entry) {
                            provider_block.push(ModelSelectorItem::empty(
                                provider.clone(),
                                Some(msg),
                                Some(status_entry.state),
                            ));
                            rendered_body = true;
                        }
                    } else if !search_active {
                        let message = match status_entry.state {
                            ModelAvailabilityState::Unavailable => {
                                format!("{} unavailable", Self::scope_display_name(&scope))
                            }
                            ModelAvailabilityState::Available => {
                                format!("No {} models found", Self::scope_display_name(&scope))
                            }
                            ModelAvailabilityState::Unknown => "No models configured".to_string(),
                        };
                        provider_block.push(ModelSelectorItem::empty(
                            provider.clone(),
                            Some(message),
                            Some(status_entry.state),
                        ));
                        rendered_body = true;
                    }
                    continue;
                }

                if !scope_allowed {
                    if let Some(msg) = self.scope_filter_message(&scope, &status_entry) {
                        provider_block.push(ModelSelectorItem::empty(
                            provider.clone(),
                            Some(msg),
                            Some(status_entry.state),
                        ));
                        rendered_body = true;
                    }
                    continue;
                }

                rendered_body = true;
                provider_has_models = true;

                for (idx, _) in filtered {
                    provider_block.push(ModelSelectorItem::model(provider.clone(), idx));
                }
            }

            if !provider_has_models && search_active && provider_highlight.is_some() {
                provider_block.push(ModelSelectorItem::empty(
                    provider.clone(),
                    Some(format!(
                        "Provider matches '{}' but no models found",
                        search_query
                    )),
                    None,
                ));
                rendered_body = true;
            }

            if !rendered_scope && !rendered_body {
                if !search_active {
                    provider_block.push(ModelSelectorItem::empty(provider.clone(), None, None));
                } else if provider_highlight.is_some() {
                    provider_block.push(ModelSelectorItem::empty(
                        provider.clone(),
                        Some(format!("No models matching '{}'", search_query)),
                        None,
                    ));
                } else {
                    continue;
                }
            }

            items.extend(provider_block);
        }

        if items.is_empty() {
            items.push(ModelSelectorItem::empty(
                "providers",
                Some(if search_active {
                    format!("No models matching '{}'", search_query)
                } else {
                    "No providers configured".to_string()
                }),
                None,
            ));
        }

        self.visible_model_count = items
            .iter()
            .filter(|item| matches!(item.kind(), ModelSelectorItemKind::Model { .. }))
            .count();

        self.model_selector_items = items;
        self.ensure_valid_model_selection();

        if search_active {
            let current_is_model = self
                .current_model_selector_item()
                .map(|item| matches!(item.kind(), ModelSelectorItemKind::Model { .. }))
                .unwrap_or(false);

            if !current_is_model {
                if let Some((idx, _)) = self
                    .model_selector_items
                    .iter()
                    .enumerate()
                    .find(|(_, item)| matches!(item.kind(), ModelSelectorItemKind::Model { .. }))
                {
                    self.set_selected_model_item(idx);
                }
            }
        }
    }

    fn evaluate_model_search(
        &self,
        provider: &str,
        model: &ModelInfo,
        query: &str,
    ) -> Option<ModelSearchInfo> {
        let mut info = ModelSearchInfo::default();
        let mut best: Option<(usize, usize)> = None;

        let mut consider = |candidate: Option<&str>, target: &mut Option<HighlightMask>| {
            if let Some(text) = candidate {
                if let Some((score, mask)) = search_candidate(text, query) {
                    let replace = best.is_none_or(|current| score < current);
                    if replace {
                        best = Some(score);
                    }
                    *target = Some(mask);
                }
            }
        };

        let display_name = Self::display_name_for_model(model);
        consider(Some(display_name.as_str()), &mut info.name);
        consider(Some(model.id.as_str()), &mut info.id);
        let provider_display = Self::provider_display_name(provider);
        consider(Some(provider_display.as_str()), &mut info.provider);
        if let Some(desc) = model.description.as_deref() {
            consider(Some(desc), &mut info.description);
        }

        if let Some(score) = best {
            info.score = score;
            Some(info)
        } else {
            None
        }
    }

    fn provider_scope_state(&self, provider: &str, scope: &ModelScope) -> ModelAvailabilityState {
        self.provider_scope_status
            .get(provider)
            .and_then(|map| map.get(scope))
            .map(|entry| entry.state)
            .unwrap_or(ModelAvailabilityState::Unknown)
    }

    fn provider_overall_status(&self, provider: &str) -> ProviderStatus {
        if let Some(status_map) = self.provider_scope_status.get(provider) {
            let mut saw_unknown = false;
            for entry in status_map.values() {
                match entry.state {
                    ModelAvailabilityState::Unavailable => return ProviderStatus::Unavailable,
                    ModelAvailabilityState::Unknown => saw_unknown = true,
                    ModelAvailabilityState::Available => {
                        if entry.is_stale {
                            saw_unknown = true;
                        }
                    }
                }
            }
            if saw_unknown {
                ProviderStatus::RequiresSetup
            } else {
                ProviderStatus::Available
            }
        } else {
            self.annotated_models
                .iter()
                .find(|m| m.provider_id == provider)
                .map(|m| m.provider_status)
                .unwrap_or(ProviderStatus::RequiresSetup)
        }
    }

    fn provider_type_for(&self, provider: &str) -> ProviderType {
        self.annotated_models
            .iter()
            .find(|m| m.provider_id == provider)
            .map(|m| m.model.provider.provider_type)
            .unwrap_or_else(|| {
                if provider.to_ascii_lowercase().contains("cloud") {
                    ProviderType::Cloud
                } else {
                    ProviderType::Local
                }
            })
    }

    fn filter_allows_scope(&self, scope: &ModelScope) -> bool {
        match self.model_filter_mode {
            FilterMode::All => true,
            FilterMode::LocalOnly => matches!(scope, ModelScope::Local),
            FilterMode::CloudOnly => matches!(scope, ModelScope::Cloud),
            FilterMode::Available => true,
        }
    }

    fn filter_scope_allows_models(&self, scope: &ModelScope, status: &ScopeStatusEntry) -> bool {
        match self.model_filter_mode {
            FilterMode::Available => {
                status.state == ModelAvailabilityState::Available && !status.is_stale
            }
            FilterMode::LocalOnly => matches!(scope, ModelScope::Local),
            FilterMode::CloudOnly => matches!(scope, ModelScope::Cloud),
            FilterMode::All => true,
        }
    }

    fn scope_filter_message(
        &self,
        scope: &ModelScope,
        status: &ScopeStatusEntry,
    ) -> Option<String> {
        match self.model_filter_mode {
            FilterMode::Available => {
                if status.state == ModelAvailabilityState::Available && !status.is_stale {
                    return None;
                }
                Self::scope_status_summary(status).or_else(|| match status.state {
                    ModelAvailabilityState::Unavailable => {
                        Some(format!("{} unavailable", Self::scope_display_name(scope)))
                    }
                    ModelAvailabilityState::Unknown => Some(format!(
                        "{} setup required",
                        Self::scope_display_name(scope)
                    )),
                    ModelAvailabilityState::Available => Some(format!(
                        "{} cached results",
                        Self::scope_display_name(scope)
                    )),
                })
            }
            FilterMode::LocalOnly | FilterMode::CloudOnly => {
                if status.state == ModelAvailabilityState::Unavailable {
                    Self::scope_status_summary(status).or_else(|| {
                        Some(format!("{} unavailable", Self::scope_display_name(scope)))
                    })
                } else {
                    None
                }
            }
            FilterMode::All => None,
        }
    }

    pub(crate) fn provider_display_name(provider: &str) -> String {
        if provider.trim().is_empty() {
            return "Provider".to_string();
        }
        let normalized = provider.replace(['_', '-'], " ");
        capitalize_first(normalized.as_str())
    }

    fn provider_tag(provider: &str) -> String {
        match provider.trim().to_ascii_lowercase().as_str() {
            "ollama" | "ollama_local" => "ollama".to_string(),
            "ollama-cloud" | "ollama_cloud" => "ollama-cloud".to_string(),
            other => other.to_string(),
        }
    }

    fn infer_provider_type(provider: &str, scope: &ModelScope) -> ProviderType {
        match scope {
            ModelScope::Local => ProviderType::Local,
            ModelScope::Cloud => ProviderType::Cloud,
            ModelScope::Other(_) => {
                if provider.to_ascii_lowercase().contains("cloud") {
                    ProviderType::Cloud
                } else {
                    ProviderType::Local
                }
            }
        }
    }

    fn provider_status_from_state(state: ModelAvailabilityState) -> ProviderStatus {
        match state {
            ModelAvailabilityState::Available => ProviderStatus::Available,
            ModelAvailabilityState::Unavailable => ProviderStatus::Unavailable,
            ModelAvailabilityState::Unknown => ProviderStatus::RequiresSetup,
        }
    }

    fn first_model_item_index(&self) -> Option<usize> {
        self.model_selector_items
            .iter()
            .enumerate()
            .find(|(_, item)| item.is_model())
            .map(|(idx, _)| idx)
    }

    fn index_of_header(&self, provider: &str) -> Option<usize> {
        self.model_selector_items
            .iter()
            .enumerate()
            .find(|(_, item)| item.provider_if_header() == Some(provider))
            .map(|(idx, _)| idx)
    }

    fn index_of_first_model_for_provider(&self, provider: &str) -> Option<usize> {
        self.model_selector_items
            .iter()
            .enumerate()
            .find(|(_, item)| {
                matches!(
                    item.kind(),
                    ModelSelectorItemKind::Model { provider: p, .. } if p == provider
                )
            })
            .map(|(idx, _)| idx)
    }

    fn index_of_model_id(&self, model_id: &str) -> Option<usize> {
        self.model_selector_items
            .iter()
            .enumerate()
            .find(|(_, item)| {
                item.model_index()
                    .and_then(|idx| self.models.get(idx))
                    .map(|model| model.id == model_id)
                    .unwrap_or(false)
            })
            .map(|(idx, _)| idx)
    }

    fn selected_model_info(&self) -> Option<&ModelInfo> {
        self.selected_model_item
            .and_then(|idx| self.model_selector_items.get(idx))
            .and_then(|item| item.model_index())
            .and_then(|model_index| self.models.get(model_index))
    }

    fn current_model_selector_item(&self) -> Option<&ModelSelectorItem> {
        self.selected_model_item
            .and_then(|idx| self.model_selector_items.get(idx))
    }

    fn set_selected_model_item(&mut self, index: usize) {
        if self.model_selector_items.is_empty() {
            self.selected_model_item = None;
            return;
        }

        let clamped = index.min(self.model_selector_items.len().saturating_sub(1));
        self.selected_model_item = Some(clamped);

        if let Some(item) = self.model_selector_items.get(clamped) {
            match item.kind() {
                ModelSelectorItemKind::Header { provider, .. }
                | ModelSelectorItemKind::Scope { provider, .. }
                | ModelSelectorItemKind::Model { provider, .. }
                | ModelSelectorItemKind::Empty { provider, .. } => {
                    self.selected_provider = provider.clone();
                    self.update_selected_provider_index();
                }
            }
        }
    }

    fn focus_first_model_in_scope(&mut self, scope: &ModelScope) -> bool {
        if self.model_selector_items.is_empty() {
            return false;
        }

        let scope_index = self
            .model_selector_items
            .iter()
            .enumerate()
            .find(|(_, item)| matches!(item.kind(), ModelSelectorItemKind::Scope { scope: s, .. } if s == scope))
            .map(|(idx, _)| idx);

        let Some(scope_idx) = scope_index else {
            return false;
        };

        self.set_selected_model_item(scope_idx);

        let len = self.model_selector_items.len();
        let mut cursor = scope_idx + 1;
        while cursor < len {
            match self.model_selector_items[cursor].kind() {
                ModelSelectorItemKind::Model { .. } => {
                    self.set_selected_model_item(cursor);
                    return true;
                }
                ModelSelectorItemKind::Scope { .. } | ModelSelectorItemKind::Header { .. } => break,
                _ => {}
            }
            cursor += 1;
        }

        true
    }

    fn focus_first_available_model(&mut self) -> bool {
        if self.model_selector_items.is_empty() {
            return false;
        }

        if let Some(idx) = self.first_model_item_index() {
            self.set_selected_model_item(idx);
            true
        } else {
            false
        }
    }

    fn ensure_valid_model_selection(&mut self) {
        if self.model_selector_items.is_empty() {
            self.selected_model_item = None;
            return;
        }

        let needs_reset = self
            .selected_model_item
            .map(|idx| idx >= self.model_selector_items.len())
            .unwrap_or(true);

        if needs_reset {
            self.set_selected_model_item(0);
        } else if let Some(idx) = self.selected_model_item {
            self.set_selected_model_item(idx);
        }
    }

    fn move_model_selection(&mut self, direction: i32) {
        if self.model_selector_items.is_empty() {
            self.selected_model_item = None;
            return;
        }

        let len = self.model_selector_items.len() as isize;
        let mut idx = self.selected_model_item.unwrap_or(0) as isize + direction as isize;

        if idx < 0 {
            idx = 0;
        } else if idx >= len {
            idx = len - 1;
        }

        self.set_selected_model_item(idx as usize);
    }

    fn update_selected_provider_index(&mut self) {
        if let Some(idx) = self
            .available_providers
            .iter()
            .position(|p| p == &self.selected_provider)
        {
            self.selected_provider_index = idx;
        } else if !self.available_providers.is_empty() {
            self.selected_provider_index = 0;
            self.selected_provider = self.available_providers[0].clone();
        } else {
            self.selected_provider_index = 0;
        }
    }

    fn expand_provider(&mut self, provider: &str, focus_first_model: bool) {
        let provider_owned = provider.to_string();
        let needs_rebuild = self.expanded_provider.as_deref() != Some(provider);
        self.selected_provider = provider_owned.clone();
        self.expanded_provider = Some(provider_owned.clone());
        if needs_rebuild {
            self.rebuild_model_selector_items();
        }
        self.ensure_valid_model_selection();

        if focus_first_model {
            if let Some(idx) = self.index_of_first_model_for_provider(&provider_owned) {
                self.set_selected_model_item(idx);
            } else if let Some(idx) = self.index_of_header(&provider_owned) {
                self.set_selected_model_item(idx);
            }
        } else if let Some(idx) = self.index_of_header(&provider_owned) {
            self.set_selected_model_item(idx);
        }
    }

    fn collapse_provider(&mut self, provider: &str) {
        if self.expanded_provider.as_deref() == Some(provider) {
            self.expanded_provider = None;
            self.rebuild_model_selector_items();
            if let Some(idx) = self.index_of_header(provider) {
                self.set_selected_model_item(idx);
            }
        }
    }

    async fn switch_to_provider(&mut self, provider_name: &str) -> Result<()> {
        let canonical_name = Self::canonical_provider_id(provider_name);
        if Self::canonical_provider_id(&self.current_provider) == canonical_name {
            return Ok(());
        }

        use owlen_core::config::McpServerConfig;
        use std::collections::HashMap;

        if self.controller.config().provider(&canonical_name).is_none() {
            let mut guard = self.controller.config_mut();
            config::ensure_provider_config(&mut guard, &canonical_name);
        }

        let workspace_root = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
            .join("../..")
            .canonicalize()
            .ok();
        let server_binary = workspace_root.as_ref().and_then(|root| {
            [
                "target/debug/owlen-mcp-llm-server",
                "target/release/owlen-mcp-llm-server",
            ]
            .iter()
            .map(|rel| root.join(rel))
            .find(|p| p.exists())
        });

        let mut env_vars = HashMap::new();
        env_vars.insert("OWLEN_PROVIDER".to_string(), canonical_name.clone());

        let provider: Arc<dyn owlen_core::Provider> = if let Some(path) = server_binary {
            let config = McpServerConfig {
                name: canonical_name.clone(),
                command: path.to_string_lossy().into_owned(),
                args: Vec::new(),
                transport: "stdio".to_string(),
                env: env_vars,
                oauth: None,
            };
            Arc::new(RemoteMcpClient::new_with_config(&config)?)
        } else {
            Arc::new(Self::with_temp_env_vars(&env_vars, RemoteMcpClient::new)?)
        };

        self.controller.switch_provider(provider).await?;
        self.current_provider = canonical_name;
        self.model_details_cache.clear();
        self.model_info_panel.clear();
        self.set_model_info_visible(false);
        self.update_command_palette_catalog();
        Ok(())
    }

    async fn populate_model_details_cache_from_session(&mut self) {
        self.model_details_cache.clear();

        let mut populated = false;
        if let Ok(details) = self.controller.all_model_details(false).await {
            for info in details {
                self.model_details_cache.insert(info.name.clone(), info);
            }
            populated = !self.model_details_cache.is_empty();
        }

        if !populated {
            let cached = self.controller.cached_model_details().await;
            for info in cached {
                self.model_details_cache.insert(info.name.clone(), info);
            }
        }
    }

    async fn refresh_models(&mut self) -> Result<()> {
        let config_model_name = self.controller.config().general.default_model.clone();
        let config_model_provider = self.controller.config().general.default_provider.clone();

        let (all_models, errors, scope_status) = self.collect_models_from_all_providers().await;

        if all_models.is_empty() {
            self.error = if errors.is_empty() {
                Some("No models available".to_string())
            } else {
                Some(errors.join("; "))
            };
            self.models.clear();
            self.provider_scope_status.clear();
            self.model_details_cache.clear();
            self.model_info_panel.clear();
            self.set_model_info_visible(false);
            self.recompute_available_providers();
            if self.available_providers.is_empty() {
                self.available_providers.push("ollama_local".to_string());
            }
            self.rebuild_model_selector_items();
            self.selected_model_item = None;
            self.status = "No models available".to_string();
            self.update_selected_provider_index();
            self.update_command_palette_catalog();
            return Ok(());
        }

        self.models = all_models;
        self.provider_scope_status = scope_status;
        self.rebuild_annotated_models();
        self.model_info_panel.clear();
        self.set_model_info_visible(false);
        self.populate_model_details_cache_from_session().await;

        self.recompute_available_providers();

        if self.available_providers.is_empty() {
            self.available_providers.push("ollama_local".to_string());
        }

        if !config_model_provider.is_empty() {
            self.selected_provider = config_model_provider.clone();
        } else {
            self.selected_provider = self.available_providers[0].clone();
        }

        self.expanded_provider = Some(self.selected_provider.clone());
        self.update_selected_provider_index();
        // Ensure the default model is set after refreshing models (async)
        self.controller.ensure_default_model(&self.models).await;
        self.sync_selected_model_index().await;

        let current_model_name = self.controller.selected_model().to_string();
        let current_model_provider = self.controller.config().general.default_provider.clone();

        if config_model_name.as_deref() != Some(&current_model_name)
            || config_model_provider != current_model_provider
        {
            if let Err(err) = config::save_config(&self.controller.config()) {
                self.error = Some(format!("Failed to save config: {err}"));
            } else {
                self.error = None;
            }
        }

        if !errors.is_empty() {
            self.error = Some(errors.join("; "));
        } else {
            self.error = None;
        }

        self.status = format!(
            "Loaded {} models across {} provider(s)",
            self.models.len(),
            self.available_providers.len()
        );
        self.rebuild_model_selector_items();

        self.update_command_palette_catalog();

        Ok(())
    }

    async fn apply_model_selection(&mut self, model: ModelInfo) -> Result<()> {
        let model_id = model.id.clone();
        let model_label = Self::display_name_for_model(&model);

        if let Err(err) = self.switch_to_provider(&model.provider).await {
            self.error = Some(format!("Failed to switch provider: {}", err));
            self.status = "Provider switch failed".to_string();
            return Err(err);
        }

        self.selected_provider = model.provider.clone();
        self.update_selected_provider_index();

        self.controller.set_model(model_id.clone()).await;
        self.status = format!(
            "Using model: {} (provider: {})",
            model_label, self.selected_provider
        );
        self.controller.config_mut().general.default_model = Some(model_id.clone());
        self.controller.config_mut().general.default_provider = self.selected_provider.clone();
        match config::save_config(&self.controller.config()) {
            Ok(_) => self.error = None,
            Err(err) => {
                self.error = Some(format!("Failed to save config: {}", err));
            }
        }
        self.set_input_mode(InputMode::Normal);
        self.set_model_info_visible(false);
        Ok(())
    }

    async fn apply_provider_mode(&mut self, provider: &str, mode: &str) -> Result<()> {
        let normalized = match mode.trim().to_ascii_lowercase().as_str() {
            "local" | "cloud" | "auto" => mode.trim().to_ascii_lowercase(),
            other => {
                return Err(anyhow!(
                    "Unknown provider mode '{other}'. Expected local, cloud, or auto"
                ));
            }
        };

        {
            let mut config = self.controller.config_mut();
            config::ensure_provider_config(&mut config, provider);
        }

        {
            let mut config = self.controller.config_mut();
            if let Some(entry) = config.providers.get_mut(provider) {
                entry.extra.insert(
                    OLLAMA_MODE_KEY.to_string(),
                    serde_json::Value::String(normalized.clone()),
                );
            } else {
                return Err(anyhow!("Provider '{provider}' is not configured"));
            }
        }

        if let Err(err) = config::save_config(&self.controller.config()) {
            self.error = Some(format!("Failed to save provider mode: {err}"));
            return Err(err);
        }

        if provider.eq_ignore_ascii_case(&self.selected_provider) {
            if let Err(err) = self.refresh_models().await {
                self.error = Some(format!(
                    "Provider mode updated but refreshing models failed: {}",
                    err
                ));
                return Err(err);
            }
        }

        self.error = None;
        self.status = format!(
            "Provider {} mode set to {}",
            provider,
            normalized.to_ascii_uppercase()
        );
        Ok(())
    }

    async fn handle_cloud_command(&mut self, args: &[&str]) -> Result<()> {
        if args.is_empty() {
            return Err(anyhow!(
                "Usage: :cloud <setup|status|models|logout> [options]"
            ));
        }

        match args[0] {
            "setup" => self.cloud_setup(&args[1..]).await,
            "status" | "models" | "logout" => Err(anyhow!(
                ":cloud {} is not implemented in the TUI. Run `owlen cloud {}` from the shell.",
                args[0],
                args[0]
            )),
            other => Err(anyhow!("Unknown :cloud subcommand: {other}")),
        }
    }

    async fn cloud_setup(&mut self, args: &[&str]) -> Result<()> {
        let options = CloudSetupOptions::parse(args)?;
        let mut stored_securely = false;

        let (existing_plain_api_key, normalized_endpoint, encryption_enabled, base_was_overridden) = {
            let mut config = self.controller.config_mut();
            config::ensure_provider_config(&mut config, &options.provider);
            let (existing_plain_api_key, normalized_endpoint_local, base_overridden_local) =
                if let Some(entry) = config.providers.get_mut(&options.provider) {
                    let existing = entry.api_key.clone();
                    entry.enabled = true;
                    entry.provider_type = "ollama_cloud".to_string();
                    let should_update_env = match entry.api_key_env.as_deref() {
                        None => true,
                        Some(value) => {
                            value.eq_ignore_ascii_case(LEGACY_OLLAMA_CLOUD_API_KEY_ENV)
                                || value.eq_ignore_ascii_case(LEGACY_OWLEN_OLLAMA_CLOUD_API_KEY_ENV)
                        }
                    };
                    if should_update_env {
                        entry.api_key_env = Some(OLLAMA_API_KEY_ENV.to_string());
                    }
                    let requested = options
                        .endpoint
                        .clone()
                        .unwrap_or_else(|| DEFAULT_CLOUD_ENDPOINT.to_string());
                    let normalized_endpoint_local = normalize_cloud_endpoint(&requested);
                    entry.extra.insert(
                        OLLAMA_CLOUD_ENDPOINT_KEY.to_string(),
                        Value::String(normalized_endpoint_local.clone()),
                    );
                    let should_override = options.force_cloud_base_url
                        || entry
                            .base_url
                            .as_ref()
                            .map(|value| value.trim().is_empty())
                            .unwrap_or(true);
                    let mut base_overridden_local = false;
                    if should_override {
                        entry.base_url = Some(normalized_endpoint_local.clone());
                        base_overridden_local = true;
                    }
                    (existing, normalized_endpoint_local, base_overridden_local)
                } else {
                    return Err(anyhow!("Provider '{}' is not configured", options.provider));
                };
            let encryption_enabled = config.privacy.encrypt_local_data;
            (
                existing_plain_api_key,
                normalized_endpoint_local,
                encryption_enabled,
                base_overridden_local,
            )
        };
        let base_overridden = base_was_overridden;

        let credential_manager = self.controller.credential_manager();

        let mut resolved_api_key = options
            .api_key
            .clone()
            .filter(|value| !value.trim().is_empty());
        if resolved_api_key.is_none() {
            if let Some(existing) = existing_plain_api_key.as_ref() {
                if !existing.trim().is_empty() {
                    resolved_api_key = Some(existing.clone());
                }
            }
        }

        if resolved_api_key.is_none() && credential_manager.is_some() {
            if let Some(manager) = credential_manager.clone() {
                if let Some(credentials) = manager
                    .get_credentials(OLLAMA_CLOUD_CREDENTIAL_ID)
                    .await
                    .with_context(|| "Failed to load stored Ollama Cloud credentials")?
                {
                    if !credentials.api_key.trim().is_empty() {
                        resolved_api_key = Some(credentials.api_key);
                    }
                }
            }
        }

        if resolved_api_key.is_none() {
            if let Ok(env_key) = std::env::var("OLLAMA_API_KEY") {
                if !env_key.trim().is_empty() {
                    resolved_api_key = Some(env_key);
                }
            }
        }

        if resolved_api_key.is_none() {
            return Err(anyhow!(
                "No API key provided. Pass `--api-key <value>` or export OLLAMA_API_KEY."
            ));
        }

        let api_key = resolved_api_key
            .map(|value| value.trim().to_string())
            .filter(|value| !value.is_empty())
            .ok_or_else(|| anyhow!("Ollama Cloud API key cannot be blank"))?;

        if encryption_enabled {
            if let Some(manager) = credential_manager.clone() {
                let credentials = ApiCredentials {
                    api_key: api_key.clone(),
                    endpoint: normalized_endpoint.clone(),
                };
                manager
                    .store_credentials(OLLAMA_CLOUD_CREDENTIAL_ID, &credentials)
                    .await
                    .with_context(|| "Failed to store Ollama Cloud credentials securely")?;
                stored_securely = true;
                let mut config = self.controller.config_mut();
                if let Some(entry) = config.providers.get_mut(&options.provider) {
                    entry.api_key = None;
                }
            } else {
                self.push_toast(
                    ToastLevel::Warning,
                    "Secure credential vault unavailable; storing API key in configuration.",
                );
                let mut config = self.controller.config_mut();
                if let Some(entry) = config.providers.get_mut(&options.provider) {
                    entry.api_key = Some(api_key.clone());
                }
            }
        } else {
            let mut config = self.controller.config_mut();
            if let Some(entry) = config.providers.get_mut(&options.provider) {
                entry.api_key = Some(api_key.clone());
            }
        }

        if let Err(err) = config::save_config(&self.controller.config()) {
            return Err(anyhow!("Failed to save configuration: {}", err));
        }

        if let Err(err) = self.refresh_models().await {
            self.push_toast(
                ToastLevel::Warning,
                format!("Cloud setup saved, but refreshing models failed: {err}"),
            );
        }

        let mut status_parts = Vec::new();
        status_parts.push(format!(
            "Configured {} for Ollama Cloud ({})",
            options.provider, normalized_endpoint
        ));
        if stored_securely {
            status_parts.push("API key stored securely".to_string());
        } else {
            status_parts.push("API key stored in configuration".to_string());
        }
        if !base_overridden && !options.force_cloud_base_url {
            status_parts.push("Local base URL preserved".to_string());
        }

        self.status = status_parts.join(" · ");
        self.error = None;
        Ok(())
    }

    async fn show_model_picker(&mut self, filter: Option<FilterMode>) -> Result<()> {
        self.refresh_models().await?;

        if self.models.is_empty() {
            return Ok(());
        }

        // Respect caller-specified filter or fall back to the last-used mode.
        if let Some(mode) = filter {
            self.model_filter_memory = mode;
            self.update_model_filter_mode(mode);
        } else {
            let remembered = self.model_filter_memory;
            self.update_model_filter_mode(remembered);
        }

        // Reset transient search state when opening the picker.
        self.reset_model_picker_state();
        self.rebuild_model_selector_items();
        self.update_model_search_status();

        if self.available_providers.len() <= 1 {
            self.set_input_mode(InputMode::ModelSelection);
            self.ensure_valid_model_selection();
        } else {
            self.set_input_mode(InputMode::ProviderSelection);
        }
        self.status = "Select a model to use".to_string();
        Ok(())
    }

    fn best_model_match_index(&self, query: &str) -> Option<usize> {
        let query = query.trim();
        if query.is_empty() {
            return None;
        }

        let mut best: Option<(usize, usize, usize)> = None;
        for (idx, model) in self.models.iter().enumerate() {
            let mut candidates = Vec::new();
            candidates.push(commands::match_score(model.id.as_str(), query));
            if !model.name.is_empty() {
                candidates.push(commands::match_score(model.name.as_str(), query));
            }
            candidates.push(commands::match_score(
                format!("{} {}", model.provider, model.id).as_str(),
                query,
            ));
            if !model.name.is_empty() {
                candidates.push(commands::match_score(
                    format!("{} {}", model.provider, model.name).as_str(),
                    query,
                ));
            }
            candidates.push(commands::match_score(
                format!("{}::{}", model.provider, model.id).as_str(),
                query,
            ));

            if let Some(score) = candidates.into_iter().flatten().min() {
                let entry = (score.0, score.1, idx);
                let replace = match best.as_ref() {
                    Some(current) => entry < *current,
                    None => true,
                };
                if replace {
                    best = Some(entry);
                }
            }
        }

        best.map(|(_, _, idx)| idx)
    }

    fn best_provider_match(&self, query: &str) -> Option<String> {
        let query = query.trim();
        if query.is_empty() {
            return None;
        }

        let mut best: Option<(usize, usize, &String)> = None;
        for provider in &self.available_providers {
            if let Some(score) = commands::match_score(provider.as_str(), query) {
                let entry = (score.0, score.1, provider);
                let replace = match best.as_ref() {
                    Some(current) => entry < *current,
                    None => true,
                };
                if replace {
                    best = Some(entry);
                }
            }
        }

        best.map(|(_, _, provider)| provider.clone())
    }

    async fn select_model_with_filter(&mut self, filter: &str) -> Result<()> {
        let query = filter.trim();
        if query.is_empty() {
            return Err(anyhow!(
                "Provide a model filter (e.g. :model llama3) or omit arguments to open the picker."
            ));
        }

        self.refresh_models().await?;
        if self.models.is_empty() {
            return Err(anyhow!(
                "No models available. Use :model to refresh once a provider is reachable."
            ));
        }

        if let Some(idx) = self.best_model_match_index(query) {
            if let Some(model) = self.models.get(idx).cloned() {
                self.apply_model_selection(model).await?;
                return Ok(());
            }
        }

        Err(anyhow!(format!(
            "No model matching '{}'. Use :model to browse available models.",
            filter
        )))
    }

    fn send_user_message_and_request_response(&mut self) {
        let content = self.controller.input_buffer().text().trim().to_string();
        if content.is_empty() {
            self.error = Some("Cannot send empty message".to_string());
            return;
        }

        // Step 1: Add user message to conversation immediately (synchronous)
        let message = self.controller.input_buffer_mut().commit_to_history();
        let mut references = Self::extract_resource_references(&message);
        references.sort();
        references.dedup();
        self.pending_resource_refs = references;
        self.controller
            .conversation_mut()
            .push_user_message(message.clone());

        // Auto-scroll to bottom when sending a message
        self.auto_scroll.stick_to_bottom = true;

        // Step 2: Set flag to process LLM request on next event loop iteration
        self.pending_llm_request = true;
        self.status = "Message sent".to_string();
        self.error = None;
    }

    pub fn has_active_generation(&self) -> bool {
        self.pending_llm_request || !self.streaming.is_empty()
    }

    pub fn cancel_active_generation(&mut self) -> Result<bool> {
        let mut cancelled = false;
        if self.pending_llm_request {
            self.pending_llm_request = false;
            cancelled = true;
        }

        let mut cancel_error: Option<String> = None;

        if !self.streaming.is_empty() {
            let active_ids: Vec<Uuid> = self.streaming.iter().copied().collect();
            for message_id in active_ids {
                if let Some(handle) = self.stream_tasks.remove(&message_id) {
                    handle.abort();
                }
                if let Err(err) = self
                    .controller
                    .cancel_stream(message_id, "Generation cancelled by user.")
                {
                    cancel_error = Some(err.to_string());
                }
                self.streaming.remove(&message_id);
                self.invalidate_message_cache(&message_id);
                cancelled = true;
            }
        }

        if cancelled {
            if let Some(err) = cancel_error {
                self.error = Some(format!("Failed to finalize cancelled stream: {}", err));
            } else {
                self.error = None;
            }
            self.stop_loading_animation();
            self.pending_tool_execution = None;
            self.pending_consent = None;
            self.queued_consents.clear();
            self.current_thinking = None;
            self.agent_actions = None;
            self.status = "Generation cancelled".to_string();
            self.set_system_status("Generation cancelled".to_string());
            self.update_thinking_from_last_message();
        }

        Ok(cancelled)
    }

    fn reset_after_new_conversation(&mut self) -> Result<()> {
        let _ = self.cancel_active_generation()?;
        self.close_code_view();
        self.set_system_status(String::new());
        self.pending_llm_request = false;
        self.pending_tool_execution = None;
        self.pending_consent = None;
        self.queued_consents.clear();
        self.pending_key = None;
        self.visual_start = None;
        self.visual_end = None;
        self.clipboard.clear();

        {
            let buffer = self.controller.input_buffer_mut();
            buffer.clear();
            buffer.clear_history();
        }

        self.textarea = TextArea::default();
        configure_textarea_defaults(&mut self.textarea);

        self.auto_scroll = AutoScroll::default();
        self.thinking_scroll = AutoScroll::default();

        self.chat_cursor = (0, 0);
        self.thinking_cursor = (0, 0);

        self.current_thinking = None;
        self.agent_actions = None;
        self.agent_mode = false;
        self.agent_running = false;
        self.is_loading = false;
        self.message_line_cache.clear();

        // Ensure no orphaned stream tasks remain
        for (_, handle) in self.stream_tasks.drain() {
            handle.abort();
        }
        self.streaming.clear();

        self.focused_panel = FocusedPanel::Input;
        self.ensure_focus_valid();

        Ok(())
    }

    pub async fn process_pending_llm_request(&mut self) -> Result<()> {
        if !self.pending_llm_request {
            return Ok(());
        }

        self.pending_llm_request = false;

        self.resolve_pending_resource_references().await?;

        // Check if agent mode is enabled
        if self.agent_mode {
            return self.process_agent_request().await;
        }

        // Step 1: Show loading model status and start animation
        self.status = format!("Loading model '{}'...", self.controller.selected_model());
        self.start_loading_animation();

        let parameters = ChatParameters {
            stream: self.controller.config().general.enable_streaming,
            ..Default::default()
        };

        // Add a timeout to prevent indefinite blocking
        let request_future = self
            .controller
            .send_request_with_current_conversation(parameters);
        let timeout_duration = std::time::Duration::from_secs(30);

        match tokio::time::timeout(timeout_duration, request_future).await {
            Ok(Ok(SessionOutcome::Complete(response))) => {
                if let Some(usage) = response.usage.as_ref() {
                    self.update_context_usage(usage);
                }
                self.stop_loading_animation();
                self.status = "Ready".to_string();
                self.error = None;
                self.refresh_usage_summary().await?;
                Ok(())
            }
            Ok(Ok(SessionOutcome::Streaming {
                response_id,
                stream,
            })) => {
                self.status = "Model loaded. Generating response... (streaming)".to_string();

                self.spawn_stream(response_id, stream);
                match self.controller.mark_stream_placeholder(response_id, "▌") {
                    Ok(_) => self.error = None,
                    Err(err) => {
                        self.error = Some(format!("Could not set response placeholder: {}", err));
                    }
                }
                Ok(())
            }
            Ok(Err(err)) => {
                self.stop_loading_animation();
                if self.handle_provider_error(&err).await? {
                    return Ok(());
                }
                let message = err.to_string();
                if message.to_lowercase().contains("not found") {
                    self.error = Some(
                        "Model not available. Press 'm' to pick another installed model."
                            .to_string(),
                    );
                    self.status = "Model unavailable".to_string();
                    let _ = self.refresh_models().await;
                    self.set_input_mode(InputMode::ProviderSelection);
                } else {
                    self.error = Some(message);
                    self.status = "Request failed".to_string();
                }
                Ok(())
            }
            Err(_) => {
                self.error = Some("Request timed out. Check if Ollama is running.".to_string());
                self.status = "Request timed out".to_string();
                self.stop_loading_animation();
                Ok(())
            }
        }
    }

    async fn handle_provider_error(&mut self, err: &CoreError) -> Result<bool> {
        let current_provider = Self::canonical_provider_id(&self.current_provider);
        if current_provider != "ollama_cloud" {
            return Ok(false);
        }

        match err {
            CoreError::Auth(message) => {
                self.push_toast(
                    ToastLevel::Error,
                    "Cloud key invalid; using local provider.",
                );

                let switch_result = self.switch_to_provider("ollama_local").await;
                if let Err(switch_err) = switch_result {
                    let detail = format!(
                        "Cloud key invalid and local fallback failed: {}",
                        switch_err
                    );
                    self.error = Some(detail.clone());
                    self.status = "Cloud authentication failed".to_string();
                    self.push_toast(ToastLevel::Error, detail);
                } else {
                    self.selected_provider = "ollama_local".to_string();
                    self.expanded_provider = Some("ollama_local".to_string());
                    self.update_selected_provider_index();

                    {
                        let mut cfg = self.controller.config_mut();
                        cfg.general.default_provider = "ollama_local".to_string();
                    }

                    let save_result = {
                        let cfg = self.controller.config();
                        config::save_config(&cfg)
                    };
                    if let Err(save_err) = save_result {
                        self.push_toast(
                            ToastLevel::Warning,
                            format!(
                                "Fell back to local provider, but failed to save config: {}",
                                save_err
                            ),
                        );
                    }

                    if let Err(refresh_err) = self.refresh_models().await {
                        self.push_toast(
                            ToastLevel::Warning,
                            format!("Failed to refresh local models: {}", refresh_err),
                        );
                    }

                    self.status =
                        "Cloud authentication failed; using local provider instead.".to_string();
                    self.error = Some(format!(
                        "Cloud key invalid: {}. Update your credentials and reselect the cloud provider.",
                        message
                    ));
                    self.push_toast(ToastLevel::Info, "Switched back to local provider.");
                }

                Ok(true)
            }
            CoreError::Network(message) => {
                let lower = message.to_ascii_lowercase();
                if message.contains("429")
                    || lower.contains("too many requests")
                    || lower.contains("rate limit")
                {
                    self.error = Some("Cloud rate limit hit; retry later.".to_string());
                    self.status = "Cloud rate limit hit".to_string();
                    self.push_toast(ToastLevel::Warning, "Cloud rate limit hit; retry later.");
                    return Ok(true);
                }
                Ok(false)
            }
            _ => Ok(false),
        }
    }

    async fn process_agent_request(&mut self) -> Result<()> {
        use owlen_core::agent::{AgentConfig, AgentExecutor};
        use owlen_core::mcp::remote_client::RemoteMcpClient;
        use std::sync::Arc;

        self.agent_running = true;
        self.status = "Agent is running...".to_string();
        self.start_loading_animation();

        // Get the last user message
        let user_message = self
            .controller
            .conversation()
            .messages
            .iter()
            .rev()
            .find(|m| m.role == owlen_core::types::Role::User)
            .map(|m| m.content.clone())
            .unwrap_or_default();

        // Create agent config
        let config = AgentConfig {
            max_iterations: 10,
            model: self.controller.selected_model().to_string(),
            temperature: Some(0.7),
            max_tokens: None,
        };

        // Get the provider
        let provider = self.controller.provider().clone();

        // Create MCP client
        let mcp_client = match RemoteMcpClient::new() {
            Ok(client) => Arc::new(client),
            Err(e) => {
                self.error = Some(format!("Failed to initialize MCP client: {}", e));
                self.agent_running = false;
                self.agent_mode = false;
                self.stop_loading_animation();
                return Ok(());
            }
        };

        // Create agent executor
        let executor = AgentExecutor::new(provider, mcp_client, config);

        // Run agent
        match executor.run(user_message).await {
            Ok(result) => {
                self.controller
                    .conversation_mut()
                    .push_assistant_message(result.answer);
                self.agent_running = false;
                self.agent_mode = false;
                self.agent_actions = None;
                self.status = format!("Agent completed in {} iterations", result.iterations);
                self.stop_loading_animation();
                Ok(())
            }
            Err(e) => {
                self.error = Some(format!("Agent failed: {}", e));
                self.agent_running = false;
                self.agent_mode = false;
                self.agent_actions = None;
                self.stop_loading_animation();
                Ok(())
            }
        }
    }

    pub async fn process_pending_tool_execution(&mut self) -> Result<()> {
        let Some((message_id, tool_calls)) = self.pending_tool_execution.take() else {
            return Ok(());
        };

        // If a consent dialog is active, keep the execution queued until it resolves
        if self.pending_consent.is_some() {
            self.pending_tool_execution = Some((message_id, tool_calls));
            return Ok(());
        }

        // Check if consent is needed for any of these tools
        let consent_needed = self.controller.check_tools_consent_needed(&tool_calls);

        if !consent_needed.is_empty() {
            // Re-queue the execution and ensure a controller event is emitted
            self.pending_tool_execution = Some((message_id, tool_calls));
            self.controller.check_streaming_tool_calls(message_id);
            return Ok(());
        }

        // Show tool execution status
        self.status = format!("🔧 Executing {} tool(s)...", tool_calls.len());

        // Show tool names in system output
        let tool_names: Vec<String> = tool_calls.iter().map(|tc| tc.name.clone()).collect();
        self.set_system_status(format!("🔧 Executing tools: {}", tool_names.join(", ")));

        self.start_loading_animation();

        // Execute tools and get the result
        match self
            .controller
            .execute_streaming_tools(message_id, tool_calls)
            .await
        {
            Ok(SessionOutcome::Streaming {
                response_id,
                stream,
            }) => {
                // Tool execution succeeded, spawn stream handler for continuation
                self.status = "Tool results sent. Generating response...".to_string();
                self.set_system_status("✓ Tools executed successfully".to_string());
                self.spawn_stream(response_id, stream);
                match self.controller.mark_stream_placeholder(response_id, "▌") {
                    Ok(_) => self.error = None,
                    Err(err) => {
                        self.error = Some(format!("Could not set response placeholder: {}", err));
                    }
                }
                Ok(())
            }
            Ok(SessionOutcome::Complete(_response)) => {
                // Tool execution complete without streaming (shouldn't happen in streaming mode)
                self.stop_loading_animation();
                self.status = "✓ Tool execution complete".to_string();
                self.set_system_status("✓ Tool execution complete".to_string());
                self.error = None;
                Ok(())
            }
            Err(err) => {
                self.stop_loading_animation();
                self.status = "Tool execution failed".to_string();
                self.set_system_status(format!("❌ Tool execution failed: {}", err));
                self.error = Some(format!("Tool execution failed: {}", err));
                Ok(())
            }
        }
    }

    // Updated to async to allow awaiting async controller calls
    async fn sync_selected_model_index(&mut self) {
        self.expanded_provider = Some(self.selected_provider.clone());
        self.rebuild_model_selector_items();

        let current_model_id = self.controller.selected_model().to_string();
        let mut config_updated = false;

        if let Some(idx) = self.index_of_model_id(&current_model_id) {
            self.set_selected_model_item(idx);
        } else {
            if let Some(idx) = self.index_of_first_model_for_provider(&self.selected_provider) {
                self.set_selected_model_item(idx);
            } else if let Some(idx) = self.index_of_header(&self.selected_provider) {
                self.set_selected_model_item(idx);
            } else if let Some(idx) = self.first_model_item_index() {
                self.set_selected_model_item(idx);
            } else {
                self.ensure_valid_model_selection();
            }

            if let Some(model) = self.selected_model_info().cloned() {
                self.selected_provider = model.provider.clone();
                // Set the selected model asynchronously
                self.controller.set_model(model.id.clone()).await;
                self.controller.config_mut().general.default_model = Some(model.id.clone());
                self.controller.config_mut().general.default_provider =
                    self.selected_provider.clone();
                config_updated = true;
            }
        }

        self.update_selected_provider_index();

        if config_updated {
            if let Err(err) = config::save_config(&self.controller.config()) {
                self.error = Some(format!("Failed to save config: {err}"));
            } else {
                self.error = None;
            }
        }
    }

    pub fn set_viewport_dimensions(&mut self, height: usize, content_width: usize) {
        self.viewport_height = height;
        self.content_width = content_width;
    }

    pub fn set_thinking_viewport_height(&mut self, height: usize) {
        self.thinking_viewport_height = height;
    }

    pub fn start_loading_animation(&mut self) {
        self.is_loading = true;
        self.loading_animation_frame = 0;
    }

    pub fn stop_loading_animation(&mut self) {
        self.is_loading = false;
    }

    pub fn advance_loading_animation(&mut self) {
        if self.is_loading {
            self.loading_animation_frame = (self.loading_animation_frame + 1) % 8;
            // 8-frame animation
        }
    }

    pub fn get_loading_indicator(&self) -> &'static str {
        if !self.is_loading {
            return "";
        }

        match self.loading_animation_frame {
            0 => "⠋",
            1 => "⠙",
            2 => "⠹",
            3 => "⠸",
            4 => "⠼",
            5 => "⠴",
            6 => "⠦",
            7 => "⠧",
            _ => "⠋",
        }
    }

    pub fn current_thinking(&self) -> Option<&String> {
        self.current_thinking.as_ref()
    }

    /// Get a reference to the latest agent actions, if any.
    pub fn agent_actions(&self) -> Option<&String> {
        self.agent_actions.as_ref()
    }

    /// Set the current agent actions content.
    pub fn set_agent_actions(&mut self, actions: String) {
        self.agent_actions = Some(actions);
    }

    /// Check if agent mode is enabled
    pub fn is_agent_mode(&self) -> bool {
        self.agent_mode
    }

    /// Check if agent is currently running
    pub fn is_agent_running(&self) -> bool {
        self.agent_running
    }

    pub fn get_rendered_lines(&self) -> Vec<String> {
        match self.focused_panel {
            FocusedPanel::Chat => {
                let conversation = self.conversation();
                let mut formatter = self.formatter().clone();
                let body_width = self.content_width.max(1);
                let mut card_width = body_width.saturating_add(4);
                let mut compact_cards = false;
                if card_width < MIN_MESSAGE_CARD_WIDTH {
                    card_width = body_width.saturating_add(2).max(1);
                    compact_cards = true;
                }
                let inner_width = if compact_cards {
                    card_width.saturating_sub(2).max(1)
                } else {
                    card_width.saturating_sub(4).max(1)
                };
                formatter.set_wrap_width(body_width);
                let role_label_mode = formatter.role_label_mode();

                let mut lines = Vec::new();

                for message in conversation.messages.iter() {
                    let role = &message.role;
                    let content_to_display = if matches!(role, Role::Assistant) {
                        let (content_without_think, _) =
                            formatter.extract_thinking(&message.content);
                        content_without_think
                    } else if matches!(role, Role::Tool) {
                        format_tool_output(&message.content)
                    } else {
                        message.content.clone()
                    };

                    let is_streaming = message
                        .metadata
                        .get("streaming")
                        .and_then(|value| value.as_bool())
                        .unwrap_or(false);

                    let normalized_content = content_to_display.replace("\r\n", "\n");
                    let trimmed = normalized_content.trim();
                    let segments = parse_message_segments(trimmed, self.render_markdown);

                    let mut body_lines: Vec<String> = Vec::new();
                    let mut indicator_target: Option<usize> = None;

                    let mut append_segments_plain =
                        |segments: &[MessageSegment],
                         indent: &str,
                         available_width: usize,
                         indicator_target: &mut Option<usize>,
                         code_width: usize| {
                            if segments.is_empty() {
                                let line_text = if indent.is_empty() {
                                    String::new()
                                } else {
                                    indent.to_string()
                                };
                                body_lines.push(line_text);
                                *indicator_target = Some(body_lines.len() - 1);
                                return;
                            }

                            for segment in segments {
                                match segment {
                                    MessageSegment::Text { lines: seg_lines } => {
                                        for line_text in seg_lines {
                                            let mut chunks =
                                                wrap_unicode(line_text.as_str(), available_width);
                                            if chunks.is_empty() {
                                                chunks.push(String::new());
                                            }
                                            for chunk in chunks {
                                                let text = if indent.is_empty() {
                                                    chunk.clone()
                                                } else {
                                                    format!("{indent}{chunk}")
                                                };
                                                body_lines.push(text);
                                                *indicator_target = Some(body_lines.len() - 1);
                                            }
                                        }
                                    }
                                    MessageSegment::CodeBlock {
                                        language,
                                        lines: code_lines,
                                    } => {
                                        append_code_block_lines_plain(
                                            &mut body_lines,
                                            indent,
                                            code_width,
                                            language.as_deref(),
                                            code_lines,
                                            indicator_target,
                                        );
                                    }
                                }
                            }
                        };

                    match role_label_mode {
                        RoleLabelDisplay::Above => {
                            let indent = "  ";
                            let indent_width = UnicodeWidthStr::width(indent);
                            let available_width = body_width.saturating_sub(indent_width).max(1);
                            append_segments_plain(
                                &segments,
                                indent,
                                available_width,
                                &mut indicator_target,
                                body_width.saturating_sub(indent_width),
                            );
                        }
                        RoleLabelDisplay::Inline | RoleLabelDisplay::None => {
                            let indent = "";
                            let available_width = body_width.max(1);
                            append_segments_plain(
                                &segments,
                                indent,
                                available_width,
                                &mut indicator_target,
                                body_width,
                            );
                        }
                    }

                    let loading_indicator = self.get_loading_indicator();
                    if is_streaming && !loading_indicator.is_empty() {
                        let spinner_symbol = streaming_indicator_symbol(loading_indicator);
                        if let Some(idx) = indicator_target {
                            if let Some(line) = body_lines.get_mut(idx) {
                                if !line.is_empty() {
                                    line.push(' ');
                                }
                                line.push_str(spinner_symbol);
                            }
                        } else if let Some(line) = body_lines.last_mut() {
                            if !line.is_empty() {
                                line.push(' ');
                            }
                            line.push_str(spinner_symbol);
                        } else {
                            body_lines.push(spinner_symbol.to_string());
                        }
                    }

                    let formatted_timestamp = if self.show_message_timestamps {
                        Some(Self::format_message_timestamp(message.timestamp))
                    } else {
                        None
                    };
                    let markers = Self::message_tool_markers(
                        role,
                        message.tool_calls.as_ref(),
                        message
                            .metadata
                            .get("tool_call_id")
                            .and_then(|value| value.as_str()),
                    );

                    if compact_cards {
                        let (emoji, title) = role_label_parts(role);
                        let mut header = format!("{emoji} {title}");
                        if let Some(ts) = formatted_timestamp.as_deref() {
                            header.push_str(" · ");
                            header.push_str(ts);
                        }
                        for marker in &markers {
                            header.push(' ');
                            header.push_str(marker);
                        }
                        lines.push(header);

                        if body_lines.is_empty() {
                            lines.push(String::new());
                        } else {
                            lines.extend(body_lines);
                        }

                        lines.push(String::new());
                    } else {
                        lines.push(Self::build_card_header_plain(
                            role,
                            formatted_timestamp.as_deref(),
                            &markers,
                            card_width,
                        ));

                        if body_lines.is_empty() {
                            lines.push(Self::wrap_card_body_line_plain("", inner_width));
                        } else {
                            for body_line in body_lines {
                                lines
                                    .push(Self::wrap_card_body_line_plain(&body_line, inner_width));
                            }
                        }

                        lines.push(Self::build_card_footer_plain(card_width));
                    }
                }
                let last_message_is_user = conversation
                    .messages
                    .last()
                    .map(|msg| matches!(msg.role, Role::User))
                    .unwrap_or(true);

                if !self.get_loading_indicator().is_empty() && last_message_is_user {
                    lines.push(format!("🤖 Assistant: {}", self.get_loading_indicator()));
                }

                if self.chat_line_offset > 0 {
                    let skip = self.chat_line_offset.min(lines.len());
                    lines = lines.into_iter().skip(skip).collect();
                }

                if lines.is_empty() {
                    lines.push("No messages yet. Press 'i' to start typing.".to_string());
                }

                lines
            }
            FocusedPanel::Thinking => {
                if let Some(thinking) = &self.current_thinking {
                    thinking.lines().map(|s| s.to_string()).collect()
                } else {
                    Vec::new()
                }
            }
            FocusedPanel::Files => Vec::new(),
            FocusedPanel::Code => {
                if self.has_loaded_code_view() {
                    self.code_view_lines()
                        .iter()
                        .enumerate()
                        .map(|(idx, line)| format!("{:>4}  {}", idx + 1, line))
                        .collect()
                } else {
                    Vec::new()
                }
            }
            FocusedPanel::Input => Vec::new(),
        }
    }

    fn get_line_at_row(&self, row: usize) -> Option<String> {
        self.get_rendered_lines().get(row).cloned()
    }

    fn find_next_word_boundary(&self, row: usize, col: usize) -> Option<usize> {
        let line = self.get_line_at_row(row)?;
        owlen_core::ui::find_next_word_boundary(&line, col)
    }

    fn find_word_end(&self, row: usize, col: usize) -> Option<usize> {
        let line = self.get_line_at_row(row)?;
        owlen_core::ui::find_word_end(&line, col)
    }

    fn find_prev_word_boundary(&self, row: usize, col: usize) -> Option<usize> {
        let line = self.get_line_at_row(row)?;
        owlen_core::ui::find_prev_word_boundary(&line, col)
    }

    fn yank_from_panel(&self) -> Option<String> {
        let (start_pos, end_pos) = if let (Some(s), Some(e)) = (self.visual_start, self.visual_end)
        {
            // Normalize selection
            if s.0 < e.0 || (s.0 == e.0 && s.1 <= e.1) {
                (s, e)
            } else {
                (e, s)
            }
        } else {
            return None;
        };

        let lines = self.get_rendered_lines();
        owlen_core::ui::extract_text_from_selection(&lines, start_pos, end_pos)
    }

    pub fn update_thinking_from_last_message(&mut self) {
        // Extract thinking from the last assistant message
        if let Some(last_msg) = self
            .conversation()
            .messages
            .iter()
            .rev()
            .find(|m| matches!(m.role, Role::Assistant))
        {
            let (_, thinking) = self.formatter().extract_thinking(&last_msg.content);
            // Only set stick_to_bottom if content actually changed (to enable auto-scroll during streaming)
            let content_changed = self.current_thinking != thinking;
            self.current_thinking = thinking;
            if content_changed {
                // Auto-scroll thinking panel to bottom when content updates
                self.thinking_scroll.stick_to_bottom = true;
            }
        } else {
            self.current_thinking = None;
            // If thinking panel was focused but thinking disappeared, switch to Chat
            if matches!(self.focused_panel, FocusedPanel::Thinking) {
                self.focused_panel = FocusedPanel::Chat;
            }
        }
    }

    fn spawn_stream(&mut self, message_id: Uuid, mut stream: owlen_core::ChatStream) {
        let sender = self.session_tx.clone();
        self.streaming.insert(message_id);

        let handle = tokio::spawn(async move {
            use futures_util::StreamExt;

            while let Some(item) = stream.next().await {
                match item {
                    Ok(response) => {
                        if sender
                            .send(SessionEvent::StreamChunk {
                                message_id,
                                response,
                            })
                            .is_err()
                        {
                            break;
                        }
                    }
                    Err(e) => {
                        let _ = sender.send(SessionEvent::StreamError {
                            message_id: Some(message_id),
                            message: e.to_string(),
                        });
                        break;
                    }
                }
            }
        });

        self.stream_tasks.insert(message_id, handle);
    }
}

fn capitalize_first(input: &str) -> String {
    let mut chars = input.chars();
    if let Some(first) = chars.next() {
        let mut result = first.to_uppercase().collect::<String>();
        result.push_str(chars.as_str());
        result
    } else {
        String::new()
    }
}

pub(crate) fn role_label_parts(role: &Role) -> (&'static str, &'static str) {
    match role {
        Role::User => ("👤", "You"),
        Role::Assistant => ("🤖", "Assistant"),
        Role::System => ("⚙️", "System"),
        Role::Tool => ("🔧", "Tool"),
    }
}

pub(crate) fn max_inline_label_width() -> usize {
    [
        ("👤", "You"),
        ("🤖", "Assistant"),
        ("⚙️", "System"),
        ("🔧", "Tool"),
    ]
    .iter()
    .map(|(emoji, title)| {
        let measure = format!("{emoji} {title}:");
        UnicodeWidthStr::width(measure.as_str())
    })
    .max()
    .unwrap_or(0)
}

pub(crate) fn streaming_indicator_symbol(indicator: &str) -> &str {
    if indicator.is_empty() {
        "▌"
    } else {
        indicator
    }
}

fn parse_message_segments(content: &str, markdown_enabled: bool) -> Vec<MessageSegment> {
    if !markdown_enabled {
        let mut lines: Vec<String> = content.lines().map(|line| line.to_string()).collect();
        if lines.is_empty() {
            lines.push(String::new());
        }
        return vec![MessageSegment::Text { lines }];
    }

    let mut segments = Vec::new();
    let mut text_lines: Vec<String> = Vec::new();
    let mut lines = content.lines();

    while let Some(line) = lines.next() {
        let trimmed = line.trim_start();
        if trimmed.starts_with("```") {
            if !text_lines.is_empty() {
                segments.push(MessageSegment::Text {
                    lines: std::mem::take(&mut text_lines),
                });
            }

            let language = trimmed
                .trim_start_matches("```")
                .split_whitespace()
                .next()
                .unwrap_or("")
                .to_string();

            let mut code_lines = Vec::new();
            for code_line in lines.by_ref() {
                if code_line.trim_start().starts_with("```") {
                    break;
                }
                code_lines.push(code_line.to_string());
            }

            segments.push(MessageSegment::CodeBlock {
                language: if language.is_empty() {
                    None
                } else {
                    Some(language)
                },
                lines: code_lines,
            });
        } else {
            text_lines.push(line.to_string());
        }
    }

    if !text_lines.is_empty() {
        segments.push(MessageSegment::Text { lines: text_lines });
    } else if segments.is_empty() {
        segments.push(MessageSegment::Text {
            lines: vec![String::new()],
        });
    }

    segments
}

fn wrap_code(text: &str, width: usize) -> Vec<String> {
    if width == 0 {
        return vec![String::new()];
    }

    let options = Options::new(width)
        .word_separator(WordSeparator::UnicodeBreakProperties)
        .break_words(true);

    let mut wrapped: Vec<String> = wrap(text, options)
        .into_iter()
        .map(|segment| segment.into_owned())
        .collect();

    if wrapped.is_empty() {
        wrapped.push(String::new());
    }

    wrapped
}

fn render_markdown_lines(
    markdown: &str,
    indent: &str,
    available_width: usize,
    base_style: Style,
) -> Vec<Line<'static>> {
    let width = available_width.max(1);
    let lines: Vec<&str> = if markdown.is_empty() {
        Vec::new()
    } else {
        markdown.lines().collect()
    };

    if lines.is_empty() {
        return render_markdown_text_block(markdown, indent, width, base_style);
    }

    let mut output: Vec<Line<'static>> = Vec::new();
    let mut buffer: Vec<&str> = Vec::new();
    let mut index = 0usize;

    while index < lines.len() {
        if let Some((table, next_index)) = parse_markdown_table(&lines, index) {
            if !buffer.is_empty() {
                let block = buffer.join("\n");
                output.extend(render_markdown_text_block(
                    &block, indent, width, base_style,
                ));
                buffer.clear();
            }
            output.extend(render_markdown_table(&table, indent, width, base_style));
            index = next_index;
        } else {
            buffer.push(lines[index]);
            index += 1;
        }
    }

    if !buffer.is_empty() {
        let block = buffer.join("\n");
        output.extend(render_markdown_text_block(
            &block, indent, width, base_style,
        ));
    }

    if output.is_empty() {
        output.extend(render_markdown_text_block("", indent, width, base_style));
    }

    output
}

fn render_markdown_text_block(
    markdown: &str,
    indent: &str,
    width: usize,
    base_style: Style,
) -> Vec<Line<'static>> {
    let mut text = from_str(markdown);
    let mut output: Vec<Line<'static>> = Vec::new();

    if text.lines.is_empty() {
        let wrapped = wrap_markdown_spans(Vec::new(), indent, width, base_style);
        output.extend(wrapped);
    } else {
        for line in text.lines.drain(..) {
            let spans_owned = line
                .spans
                .into_iter()
                .map(|span| {
                    let owned = span.content.into_owned();
                    Span::styled(owned, span.style)
                })
                .collect::<Vec<_>>();
            let wrapped = wrap_markdown_spans(spans_owned, indent, width, base_style);
            output.extend(wrapped);
        }
    }

    if output.is_empty() {
        output.push(blank_line(indent, base_style));
    }

    output
}

#[derive(Debug)]
struct ParsedTable {
    headers: Vec<String>,
    rows: Vec<Vec<String>>,
    alignments: Vec<TableAlignment>,
}

#[derive(Clone, Copy, Debug)]
enum TableAlignment {
    Left,
    Center,
    Right,
}

fn parse_markdown_table(lines: &[&str], start: usize) -> Option<(ParsedTable, usize)> {
    if start + 1 >= lines.len() {
        return None;
    }

    let header_line = lines[start].trim();
    let alignment_line = lines[start + 1].trim();

    if header_line.is_empty() || !header_line.contains('|') {
        return None;
    }

    let headers = split_table_row(header_line);
    if headers.is_empty() {
        return None;
    }

    let alignments = parse_alignment_row(alignment_line, headers.len())?;
    let mut rows = Vec::new();
    let mut index = start + 2;

    while index < lines.len() {
        let raw = lines[index];
        let trimmed = raw.trim();

        if trimmed.is_empty() || !trimmed.contains('|') {
            break;
        }

        if trimmed
            .chars()
            .all(|ch| matches!(ch, '-' | ':' | '|' | ' '))
        {
            break;
        }

        let mut cells = split_table_row(trimmed);
        if cells.iter().all(|cell| cell.is_empty()) {
            break;
        }

        if cells.len() < headers.len() {
            cells.resize(headers.len(), String::new());
        } else if cells.len() > headers.len() {
            cells.truncate(headers.len());
        }

        rows.push(cells);
        index += 1;
    }

    Some((
        ParsedTable {
            headers,
            rows,
            alignments,
        },
        index,
    ))
}

fn split_table_row(line: &str) -> Vec<String> {
    let trimmed = line.trim();
    if trimmed.is_empty() {
        return vec![String::new()];
    }

    let mut chars = trimmed.chars().peekable();
    // Discard a single leading pipe if present.
    if matches!(chars.peek(), Some('|')) {
        chars.next();
    }

    let mut cells = Vec::new();
    let mut current = String::new();
    let mut escape = false;

    for ch in chars {
        if escape {
            current.push(ch);
            escape = false;
            continue;
        }
        match ch {
            '\\' => {
                escape = true;
            }
            '|' => {
                cells.push(current.trim().to_string());
                current.clear();
            }
            _ => current.push(ch),
        }
    }

    if escape {
        current.push('\\');
    }

    if !trimmed.ends_with('|') || !current.trim().is_empty() {
        cells.push(current.trim().to_string());
    }

    if cells.is_empty() {
        cells.push(String::new());
    }

    cells
}

fn parse_alignment_row(line: &str, expected_columns: usize) -> Option<Vec<TableAlignment>> {
    let trimmed = line.trim();
    if trimmed.is_empty() || !trimmed.contains('-') {
        return None;
    }

    let raw_cells = split_table_row(trimmed);
    if raw_cells.len() != expected_columns {
        return None;
    }

    let mut alignments = Vec::with_capacity(expected_columns);
    for cell in raw_cells {
        let cell_trimmed = cell.trim();
        if cell_trimmed.is_empty() {
            alignments.push(TableAlignment::Left);
            continue;
        }

        if !cell_trimmed.chars().all(|ch| matches!(ch, '-' | ':' | ' ')) {
            return None;
        }

        if !cell_trimmed.contains('-') {
            return None;
        }

        let left = cell_trimmed.starts_with(':');
        let right = cell_trimmed.ends_with(':');
        let alignment = match (left, right) {
            (true, true) => TableAlignment::Center,
            (false, true) => TableAlignment::Right,
            _ => TableAlignment::Left,
        };
        alignments.push(alignment);
    }

    Some(alignments)
}

fn render_markdown_table(
    table: &ParsedTable,
    indent: &str,
    available_width: usize,
    base_style: Style,
) -> Vec<Line<'static>> {
    const MIN_CELL_WIDTH: usize = 3;

    if table.headers.is_empty() {
        return render_markdown_text_block("", indent, available_width.max(1), base_style);
    }

    let indent_width = UnicodeWidthStr::width(indent);
    let padding_cost = 1 + table.headers.len() * 3;
    let available_content = available_width.saturating_sub(indent_width + padding_cost);

    if available_content < table.headers.len().saturating_mul(MIN_CELL_WIDTH) {
        return render_markdown_table_stacked(table, indent, available_width, base_style);
    }

    let mut desired_widths = vec![MIN_CELL_WIDTH; table.headers.len()];
    for (index, header) in table.headers.iter().enumerate() {
        desired_widths[index] = desired_widths[index].max(cell_display_width(header));
    }
    for row in &table.rows {
        for (index, cell) in row.iter().enumerate().take(desired_widths.len()) {
            desired_widths[index] = desired_widths[index].max(cell_display_width(cell));
        }
    }

    let constrained = constrain_column_widths(&desired_widths, available_content, MIN_CELL_WIDTH)
        .unwrap_or_else(|| vec![MIN_CELL_WIDTH; table.headers.len()]);

    if constrained.iter().sum::<usize>() > available_content {
        return render_markdown_table_stacked(table, indent, available_width, base_style);
    }

    render_markdown_table_grid(table, indent, available_width, base_style, &constrained)
}

fn render_markdown_table_grid(
    table: &ParsedTable,
    indent: &str,
    available_width: usize,
    base_style: Style,
    column_widths: &[usize],
) -> Vec<Line<'static>> {
    let mut output = Vec::new();
    output.extend(render_table_summary_lines(
        table,
        indent,
        available_width,
        base_style,
    ));
    output.push(blank_line(indent, base_style));

    output.push(build_table_border_line(
        '┌',
        '┬',
        '┐',
        column_widths,
        indent,
        base_style,
    ));

    let header_styles = vec![base_style.add_modifier(Modifier::BOLD); table.headers.len()];
    output.extend(render_table_row_lines(
        &table.headers,
        column_widths,
        &table.alignments,
        indent,
        base_style,
        &header_styles,
    ));

    if table.rows.is_empty() {
        output.push(build_table_border_line(
            '└',
            '┴',
            '┘',
            column_widths,
            indent,
            base_style,
        ));
        return output;
    }

    output.push(build_table_border_line(
        '├',
        '┼',
        '┤',
        column_widths,
        indent,
        base_style,
    ));

    let body_styles = vec![base_style; table.headers.len()];
    for (index, row) in table.rows.iter().enumerate() {
        output.extend(render_table_row_lines(
            row,
            column_widths,
            &table.alignments,
            indent,
            base_style,
            &body_styles,
        ));

        if index == table.rows.len() - 1 {
            output.push(build_table_border_line(
                '└',
                '┴',
                '┘',
                column_widths,
                indent,
                base_style,
            ));
        } else {
            output.push(build_table_border_line(
                '├',
                '┼',
                '┤',
                column_widths,
                indent,
                base_style,
            ));
        }
    }

    output
}

fn render_markdown_table_stacked(
    table: &ParsedTable,
    indent: &str,
    available_width: usize,
    base_style: Style,
) -> Vec<Line<'static>> {
    let mut output = Vec::new();
    output.extend(render_table_summary_lines(
        table,
        indent,
        available_width,
        base_style,
    ));

    if table.rows.is_empty() {
        output.push(blank_line(indent, base_style));
        let mut spans = Vec::new();
        if !indent.is_empty() {
            spans.push(Span::styled(indent.to_string(), base_style));
        }
        spans.push(Span::styled(
            "(No rows)",
            base_style.add_modifier(Modifier::ITALIC),
        ));
        output.push(Line::from(spans));
        return output;
    }

    output.push(blank_line(indent, base_style));

    let indent_width = UnicodeWidthStr::width(indent);
    let available = available_width.saturating_sub(indent_width).max(1);
    let header_style = base_style.add_modifier(Modifier::BOLD);

    for (row_index, row) in table.rows.iter().enumerate() {
        if row_index > 0 {
            output.push(blank_line(indent, base_style));
        }

        for (column_index, header) in table.headers.iter().enumerate() {
            let value = row.get(column_index).map(String::as_str).unwrap_or("");
            let bullet_prefix = if column_index == 0 {
                format!("• {}: ", header)
            } else {
                format!("  {}: ", header)
            };
            let prefix_width = UnicodeWidthStr::width(bullet_prefix.as_str());
            let value_width = available.saturating_sub(prefix_width);

            if value_width == 0 {
                let mut spans = Vec::new();
                if !indent.is_empty() {
                    spans.push(Span::styled(indent.to_string(), base_style));
                }
                spans.push(Span::styled(bullet_prefix.clone(), header_style));
                output.push(Line::from(spans));

                let wrapped_values = wrap_table_cell(value, available.max(1));
                for wrapped in wrapped_values {
                    let mut continuation = Vec::new();
                    if !indent.is_empty() {
                        continuation.push(Span::styled(indent.to_string(), base_style));
                    }
                    continuation.push(Span::styled(" ".repeat(prefix_width), header_style));
                    continuation.push(Span::styled(wrapped, base_style));
                    output.push(Line::from(continuation));
                }
                continue;
            }

            let wrapped_values = wrap_table_cell(value, value_width.max(1));
            for (line_index, wrapped) in wrapped_values.into_iter().enumerate() {
                let mut spans = Vec::new();
                if !indent.is_empty() {
                    spans.push(Span::styled(indent.to_string(), base_style));
                }
                if line_index == 0 {
                    spans.push(Span::styled(bullet_prefix.clone(), header_style));
                } else {
                    spans.push(Span::styled(" ".repeat(prefix_width), header_style));
                }
                spans.push(Span::styled(wrapped, base_style));
                output.push(Line::from(spans));
            }
        }
    }

    output
}

fn render_table_summary_lines(
    table: &ParsedTable,
    indent: &str,
    available_width: usize,
    base_style: Style,
) -> Vec<Line<'static>> {
    let mut output = Vec::new();
    let indent_width = UnicodeWidthStr::width(indent);
    let summary_width = available_width.saturating_sub(indent_width).max(1);

    let column_list = if table.headers.is_empty() {
        String::from("No columns")
    } else {
        table.headers.join(", ")
    };

    let row_count = table.rows.len();
    let prefix = if row_count == 0 {
        "Table:".to_string()
    } else if row_count == 1 {
        "Table (1 row):".to_string()
    } else {
        format!("Table ({} rows):", row_count)
    };

    let prefix_width = UnicodeWidthStr::width(prefix.as_str());
    if summary_width <= prefix_width + 1 {
        let mut combined = prefix.clone();
        if !column_list.is_empty() {
            combined.push(' ');
            combined.push_str(&column_list);
        }
        let wrapped = {
            let mut result = wrap_unicode(combined.as_str(), summary_width);
            if result.is_empty() {
                result.push(String::new());
            }
            result
        };
        for (index, text) in wrapped.into_iter().enumerate() {
            let mut spans = Vec::new();
            if !indent.is_empty() {
                spans.push(Span::styled(indent.to_string(), base_style));
            }
            let style = if index == 0 {
                base_style.add_modifier(Modifier::BOLD)
            } else {
                base_style
            };
            spans.push(Span::styled(text, style));
            output.push(Line::from(spans));
        }
        return output;
    }

    let rest_width = summary_width.saturating_sub(prefix_width + 1).max(1);
    let mut rest_lines = if column_list.is_empty() {
        vec![String::new()]
    } else {
        let mut wrapped = wrap_unicode(column_list.as_str(), rest_width);
        if wrapped.is_empty() {
            wrapped.push(String::new());
        }
        wrapped
    };

    for (index, text) in rest_lines.drain(..).enumerate() {
        let mut spans = Vec::new();
        if !indent.is_empty() {
            spans.push(Span::styled(indent.to_string(), base_style));
        }
        if index == 0 {
            spans.push(Span::styled(
                format!("{prefix} "),
                base_style.add_modifier(Modifier::BOLD),
            ));
            spans.push(Span::styled(text, base_style));
        } else {
            spans.push(Span::styled(" ".repeat(prefix_width + 1), base_style));
            spans.push(Span::styled(text, base_style));
        }
        output.push(Line::from(spans));
    }

    output
}

fn build_table_border_line(
    left: char,
    mid: char,
    right: char,
    column_widths: &[usize],
    indent: &str,
    base_style: Style,
) -> Line<'static> {
    let mut line = String::new();
    line.push(left);
    for (index, width) in column_widths.iter().enumerate() {
        line.push_str(&"─".repeat(width + 2));
        if index == column_widths.len() - 1 {
            line.push(right);
        } else {
            line.push(mid);
        }
    }

    let mut spans = Vec::new();
    if !indent.is_empty() {
        spans.push(Span::styled(indent.to_string(), base_style));
    }
    spans.push(Span::styled(line, base_style));
    Line::from(spans)
}

fn render_table_row_lines(
    cells: &[String],
    column_widths: &[usize],
    alignments: &[TableAlignment],
    indent: &str,
    border_style: Style,
    cell_styles: &[Style],
) -> Vec<Line<'static>> {
    let column_count = column_widths.len();
    let mut column_lines: Vec<Vec<String>> = Vec::with_capacity(column_count);

    for (index, width) in column_widths.iter().enumerate() {
        let cell = cells.get(index).map(String::as_str).unwrap_or("");
        column_lines.push(wrap_table_cell(cell, (*width).max(1)));
    }

    let max_height = column_lines
        .iter()
        .map(|lines| lines.len())
        .max()
        .unwrap_or(1);

    let mut output = Vec::with_capacity(max_height);
    for line_index in 0..max_height {
        let mut spans = Vec::new();
        if !indent.is_empty() {
            spans.push(Span::styled(indent.to_string(), border_style));
        }
        spans.push(Span::styled("│".to_string(), border_style));

        for (column_index, width) in column_widths.iter().enumerate() {
            let content = column_lines
                .get(column_index)
                .and_then(|lines| lines.get(line_index))
                .map(|s| s.as_str())
                .unwrap_or("");
            let alignment = alignments
                .get(column_index)
                .copied()
                .unwrap_or(TableAlignment::Left);
            let aligned = align_cell_line(alignment, content, *width);
            let cell_style = cell_styles
                .get(column_index)
                .copied()
                .unwrap_or(border_style);

            spans.push(Span::styled(" ".to_string(), border_style));
            spans.push(Span::styled(aligned, cell_style));
            spans.push(Span::styled(" ".to_string(), border_style));
            spans.push(Span::styled("│".to_string(), border_style));
        }

        output.push(Line::from(spans));
    }

    output
}

fn align_cell_line(alignment: TableAlignment, content: &str, width: usize) -> String {
    let display_width = UnicodeWidthStr::width(content);
    if display_width >= width {
        return content.to_string();
    }

    let padding = width - display_width;
    match alignment {
        TableAlignment::Left => format!("{content}{}", " ".repeat(padding)),
        TableAlignment::Right => format!("{}{}", " ".repeat(padding), content),
        TableAlignment::Center => {
            let left = padding / 2;
            let right = padding - left;
            format!("{}{}{}", " ".repeat(left), content, " ".repeat(right))
        }
    }
}

fn wrap_table_cell(content: &str, width: usize) -> Vec<String> {
    if width == 0 {
        return vec![String::new()];
    }

    let mut lines = Vec::new();
    for segment in content.split('\n') {
        let trimmed = segment.trim_end();
        if trimmed.is_empty() {
            lines.push(String::new());
            continue;
        }

        let options = Options::new(width)
            .word_separator(WordSeparator::UnicodeBreakProperties)
            .break_words(true);
        let wrapped = wrap(trimmed, options);

        if wrapped.is_empty() {
            lines.push(String::new());
        } else {
            lines.extend(wrapped.into_iter().map(|line| line.into_owned()));
        }
    }

    if lines.is_empty() {
        lines.push(String::new());
    }

    lines
}

fn constrain_column_widths(
    desired: &[usize],
    available: usize,
    min_width: usize,
) -> Option<Vec<usize>> {
    if desired.is_empty() {
        return Some(Vec::new());
    }
    if available < min_width.saturating_mul(desired.len()) {
        return None;
    }

    let mut widths: Vec<usize> = desired
        .iter()
        .map(|value| (*value).max(min_width))
        .collect();
    let mut total: usize = widths.iter().sum();

    if total <= available {
        return Some(widths);
    }

    while total > available {
        let mut changed = false;
        for value in &mut widths {
            if total <= available {
                break;
            }
            if *value > min_width {
                *value -= 1;
                total -= 1;
                changed = true;
            }
        }

        if !changed {
            break;
        }
    }

    if total > available {
        None
    } else {
        Some(widths)
    }
}

fn cell_display_width(value: &str) -> usize {
    value
        .split('\n')
        .map(|segment| UnicodeWidthStr::width(segment.trim_end()))
        .max()
        .unwrap_or(0)
        .max(1)
}

fn blank_line(indent: &str, base_style: Style) -> Line<'static> {
    let mut spans = Vec::new();
    if !indent.is_empty() {
        spans.push(Span::styled(indent.to_string(), base_style));
    }
    spans.push(Span::styled(String::new(), base_style));
    Line::from(spans)
}

fn wrap_markdown_spans(
    spans: Vec<Span<'static>>,
    indent: &str,
    available_width: usize,
    base_style: Style,
) -> Vec<Line<'static>> {
    let width = available_width.max(1);
    if spans.is_empty() {
        let mut line_spans = Vec::new();
        if !indent.is_empty() {
            line_spans.push(Span::styled(indent.to_string(), base_style));
        }
        line_spans.push(Span::styled(String::new(), base_style));
        return vec![Line::from(line_spans)];
    }

    let mut result: Vec<Line<'static>> = Vec::new();
    let mut current: Vec<Span<'static>> = Vec::new();
    let mut remaining = width;
    if !indent.is_empty() {
        current.push(Span::styled(indent.to_string(), base_style));
        remaining = remaining.saturating_sub(UnicodeWidthStr::width(indent));
    }

    for span in spans {
        let mut content = span.content.into_owned();
        let style = span.style;
        if content.is_empty() {
            continue;
        }

        while !content.is_empty() {
            if remaining == 0 {
                result.push(Line::from(std::mem::take(&mut current)));
                if !indent.is_empty() {
                    current.push(Span::styled(indent.to_string(), base_style));
                }
                remaining = width;
                if !indent.is_empty() {
                    remaining = remaining.saturating_sub(UnicodeWidthStr::width(indent));
                }
            }

            let available = remaining;
            let mut take_bytes = 0;
            let mut take_width = 0;

            for grapheme in content.graphemes(true) {
                let grapheme_width = UnicodeWidthStr::width(grapheme);
                if take_width + grapheme_width > available {
                    break;
                }
                take_bytes += grapheme.len();
                take_width += grapheme_width;
                if take_width == available {
                    break;
                }
            }

            if take_bytes == 0 {
                result.push(Line::from(std::mem::take(&mut current)));
                if !indent.is_empty() {
                    current.push(Span::styled(indent.to_string(), base_style));
                }
                remaining = width;
                if !indent.is_empty() {
                    remaining = remaining.saturating_sub(UnicodeWidthStr::width(indent));
                }
                continue;
            }

            let chunk = content[..take_bytes].to_string();
            content = content[take_bytes..].to_string();
            current.push(Span::styled(chunk, style));
            remaining = remaining.saturating_sub(take_width);
        }
    }

    if current.is_empty() {
        if !indent.is_empty() {
            current.push(Span::styled(indent.to_string(), base_style));
        }
        current.push(Span::styled(String::new(), base_style));
    }

    result.push(Line::from(current));
    result
}

fn wrap_highlight_segments(
    segments: Vec<(Style, String)>,
    code_width: usize,
    theme: &Theme,
) -> Vec<Vec<(Style, String)>> {
    let mut rows: Vec<Vec<(Style, String)>> = Vec::new();
    let mut current: Vec<(Style, String)> = Vec::new();
    let mut current_width: usize = 0;

    let push_row = |rows: &mut Vec<Vec<(Style, String)>>,
                    current: &mut Vec<(Style, String)>,
                    current_width: &mut usize| {
        rows.push(std::mem::take(current));
        *current_width = 0;
    };

    for (style_raw, text) in segments {
        let mut remaining = text.as_str();
        if remaining.is_empty() {
            continue;
        }

        while !remaining.is_empty() {
            if current_width >= code_width {
                push_row(&mut rows, &mut current, &mut current_width);
            }

            let available = code_width.saturating_sub(current_width);
            if available == 0 {
                push_row(&mut rows, &mut current, &mut current_width);
                continue;
            }

            let mut take_bytes = 0;
            let mut take_width = 0;

            for grapheme in remaining.graphemes(true) {
                let grapheme_width = UnicodeWidthStr::width(grapheme);
                if take_width + grapheme_width > available {
                    break;
                }
                take_bytes += grapheme.len();
                take_width += grapheme_width;
                if take_width == available {
                    break;
                }
            }

            if take_bytes == 0 {
                push_row(&mut rows, &mut current, &mut current_width);
                continue;
            }

            let chunk = &remaining[..take_bytes];
            remaining = &remaining[take_bytes..];

            let mut style = style_raw;
            if style.fg.is_none() {
                style = style.fg(theme.code_block_text);
            }
            style = style.bg(theme.code_block_background);

            current.push((style, chunk.to_string()));
            current_width += take_width;
        }
    }

    if !current.is_empty() {
        rows.push(current);
    } else if rows.is_empty() {
        rows.push(Vec::new());
    }

    rows
}

fn inline_code_spans_from_text(text: &str, theme: &Theme, base_style: Style) -> Vec<Span<'static>> {
    let tick_count = text.matches('`').count();
    if tick_count < 2 || (tick_count & 1) != 0 {
        return vec![Span::styled(text.to_string(), base_style)];
    }

    let code_style = Style::default()
        .fg(theme.code_block_text)
        .bg(theme.code_block_background)
        .add_modifier(Modifier::BOLD);

    let mut spans = Vec::new();
    let mut buffer = String::new();
    let mut in_code = false;

    for ch in text.chars() {
        if ch == '`' {
            if in_code {
                if !buffer.is_empty() {
                    spans.push(Span::styled(buffer.clone(), code_style));
                    buffer.clear();
                }
            } else if !buffer.is_empty() {
                spans.push(Span::styled(buffer.clone(), base_style));
                buffer.clear();
            }
            in_code = !in_code;
        } else {
            buffer.push(ch);
        }
    }

    if in_code {
        return vec![Span::styled(text.to_string(), base_style)];
    }

    if !buffer.is_empty() {
        spans.push(Span::styled(buffer, base_style));
    }

    if spans.is_empty() {
        spans.push(Span::styled(String::new(), base_style));
    }

    spans
}

#[allow(clippy::too_many_arguments)]
fn append_code_block_lines(
    rendered: &mut Vec<Line<'static>>,
    indent: &str,
    body_width: usize,
    language: Option<&str>,
    code_lines: &[String],
    theme: &Theme,
    syntax_highlighting: bool,
    indicator_target: &mut Option<usize>,
) {
    let body_width = body_width.max(4);
    let inner_width = body_width.saturating_sub(2);
    let code_width = inner_width.max(1);

    let border_style = Style::default()
        .fg(theme.code_block_border)
        .bg(theme.code_block_background);
    let label_style = Style::default()
        .fg(theme.code_block_text)
        .bg(theme.code_block_background)
        .add_modifier(Modifier::BOLD);
    let text_style = Style::default()
        .fg(theme.code_block_text)
        .bg(theme.code_block_background);

    let mut top_spans = Vec::new();
    top_spans.push(Span::styled(indent.to_string(), border_style));
    top_spans.push(Span::styled("╭", border_style));

    let language_label = language
        .and_then(|lang| {
            let trimmed = lang.trim();
            if trimmed.is_empty() {
                None
            } else {
                Some(trimmed)
            }
        })
        .map(|label| format!(" {} ", label));

    if inner_width > 0 {
        if let Some(label) = language_label {
            let label_width = UnicodeWidthStr::width(label.as_str());
            if label_width < inner_width {
                let left = (inner_width - label_width) / 2;
                let right = inner_width - label_width - left;
                if left > 0 {
                    top_spans.push(Span::styled("─".repeat(left), border_style));
                }
                top_spans.push(Span::styled(label, label_style));
                if right > 0 {
                    top_spans.push(Span::styled("─".repeat(right), border_style));
                }
            } else {
                top_spans.push(Span::styled("─".repeat(inner_width), border_style));
            }
        } else {
            top_spans.push(Span::styled("─".repeat(inner_width), border_style));
        }
    }

    top_spans.push(Span::styled("╮", border_style));
    rendered.push(Line::from(top_spans));

    let mut highlighter = if syntax_highlighting {
        Some(highlight::build_highlighter_for_language(language))
    } else {
        None
    };

    let mut process_line = |line: &str| {
        let segments = if let Some(highlighter) = highlighter.as_mut() {
            let mut segments = highlight::highlight_line(highlighter, line);
            if segments.is_empty() {
                segments.push((Style::default(), String::new()));
            }
            segments
        } else {
            vec![(Style::default(), line.to_string())]
        };

        let has_content = segments.iter().any(|(_, text)| !text.is_empty());
        let rows = if has_content {
            wrap_highlight_segments(segments, code_width, theme)
        } else {
            vec![Vec::new()]
        };

        for row in rows {
            let mut spans = Vec::new();
            spans.push(Span::styled(indent.to_string(), border_style));
            spans.push(Span::styled("│", border_style));

            let mut row_width = 0;
            if row.is_empty() {
                spans.push(Span::styled(" ".repeat(code_width), text_style));
            } else {
                for (style, piece) in row {
                    let width = UnicodeWidthStr::width(piece.as_str());
                    row_width += width;
                    spans.push(Span::styled(piece, style));
                }
                if row_width < code_width {
                    spans.push(Span::styled(" ".repeat(code_width - row_width), text_style));
                }
            }

            spans.push(Span::styled("│", border_style));
            rendered.push(Line::from(spans));
            *indicator_target = Some(rendered.len() - 1);
        }
    };

    if code_lines.is_empty() {
        process_line("");
    } else {
        for line in code_lines {
            process_line(line);
        }
    }

    let mut bottom_spans = Vec::new();
    bottom_spans.push(Span::styled(indent.to_string(), border_style));
    bottom_spans.push(Span::styled("╰", border_style));
    if inner_width > 0 {
        bottom_spans.push(Span::styled("─".repeat(inner_width), border_style));
    }
    bottom_spans.push(Span::styled("╯", border_style));
    rendered.push(Line::from(bottom_spans));
}

fn append_code_block_lines_plain(
    output: &mut Vec<String>,
    indent: &str,
    body_width: usize,
    language: Option<&str>,
    code_lines: &[String],
    indicator_target: &mut Option<usize>,
) {
    let body_width = body_width.max(4);
    let inner_width = body_width.saturating_sub(2);
    let code_width = inner_width.max(1);

    let mut top_line = String::new();
    top_line.push_str(indent);
    top_line.push('╭');

    if inner_width > 0 {
        if let Some(label) = language.and_then(|lang| {
            let trimmed = lang.trim();
            if trimmed.is_empty() {
                None
            } else {
                Some(trimmed)
            }
        }) {
            let label_text = format!(" {} ", label);
            let label_width = UnicodeWidthStr::width(label_text.as_str());
            if label_width < inner_width {
                let left = (inner_width - label_width) / 2;
                let right = inner_width - label_width - left;
                top_line.push_str(&"─".repeat(left));
                top_line.push_str(&label_text);
                top_line.push_str(&"─".repeat(right));
            } else {
                top_line.push_str(&"─".repeat(inner_width));
            }
        } else {
            top_line.push_str(&"─".repeat(inner_width));
        }
    }

    top_line.push('╮');
    output.push(top_line);

    if code_lines.is_empty() {
        let chunks = wrap_code("", code_width);
        for chunk in chunks {
            let mut line = String::new();
            line.push_str(indent);
            line.push('│');
            line.push_str(&chunk);
            let display_width = UnicodeWidthStr::width(chunk.as_str());
            if display_width < code_width {
                line.push_str(&" ".repeat(code_width - display_width));
            }
            line.push('│');
            output.push(line);
            *indicator_target = Some(output.len() - 1);
        }
    } else {
        for line_text in code_lines {
            let chunks = wrap_code(line_text.as_str(), code_width);
            for chunk in chunks {
                let mut line = String::new();
                line.push_str(indent);
                line.push('│');
                line.push_str(&chunk);
                let display_width = UnicodeWidthStr::width(chunk.as_str());
                if display_width < code_width {
                    line.push_str(&" ".repeat(code_width - display_width));
                }
                line.push('│');
                output.push(line);
                *indicator_target = Some(output.len() - 1);
            }
        }
    }

    let mut bottom_line = String::new();
    bottom_line.push_str(indent);
    bottom_line.push('╰');
    if inner_width > 0 {
        bottom_line.push_str(&"─".repeat(inner_width));
    }
    bottom_line.push('╯');
    output.push(bottom_line);
}

pub(crate) fn wrap_unicode(text: &str, width: usize) -> Vec<String> {
    if width == 0 {
        return Vec::new();
    }

    let options = Options::new(width)
        .word_separator(WordSeparator::UnicodeBreakProperties)
        .break_words(false);

    wrap(text, options)
        .into_iter()
        .map(|segment| segment.into_owned())
        .collect()
}

#[derive(Debug, Clone)]
struct CloudSetupOptions {
    provider: String,
    endpoint: Option<String>,
    api_key: Option<String>,
    force_cloud_base_url: bool,
}

impl CloudSetupOptions {
    fn parse(args: &[&str]) -> Result<Self> {
        let mut options = CloudSetupOptions {
            provider: "ollama_cloud".to_string(),
            endpoint: None,
            api_key: None,
            force_cloud_base_url: false,
        };

        let mut iter = args.iter();
        while let Some(arg) = iter.next() {
            match arg.trim() {
                "--provider" => {
                    let value = iter.next().ok_or_else(|| {
                        anyhow!("--provider expects a value (e.g. --provider ollama)")
                    })?;
                    options.provider = canonical_provider_name(value);
                }
                "--endpoint" => {
                    let value = iter.next().ok_or_else(|| {
                        anyhow!("--endpoint expects a URL (e.g. --endpoint https://ollama.com)")
                    })?;
                    options.endpoint = Some(value.trim().to_string());
                }
                "--api-key" => {
                    let value = iter.next().ok_or_else(|| {
                        anyhow!("--api-key expects a value (e.g. --api-key sk-...)")
                    })?;
                    options.api_key = Some(value.trim().to_string());
                }
                "--force-cloud-base-url" => {
                    options.force_cloud_base_url = true;
                }
                flag if flag.starts_with("--") => {
                    return Err(anyhow!("Unknown flag '{flag}' for :cloud setup"));
                }
                value => {
                    if options.api_key.is_none() {
                        options.api_key = Some(value.trim().to_string());
                    } else {
                        return Err(anyhow!(
                            "Unexpected argument '{value}'. Provide a single API key or use --api-key."
                        ));
                    }
                }
            }
        }

        if options.provider.trim().is_empty() {
            options.provider = "ollama_cloud".to_string();
        }

        options.provider = canonical_provider_name(&options.provider);

        Ok(options)
    }
}

fn canonical_provider_name(provider: &str) -> String {
    let normalized = provider.trim().to_ascii_lowercase().replace('-', "_");
    match normalized.as_str() {
        "" => "ollama_cloud".to_string(),
        "ollama" => "ollama_cloud".to_string(),
        "ollama_cloud" => "ollama_cloud".to_string(),
        value => value.to_string(),
    }
}

fn normalize_cloud_endpoint(endpoint: &str) -> String {
    let trimmed = endpoint.trim().trim_end_matches('/');
    if trimmed.is_empty() {
        DEFAULT_CLOUD_ENDPOINT.to_string()
    } else {
        trimmed.to_string()
    }
}

#[cfg(test)]
mod tests {
    use super::{ChatApp, ModelAvailabilityState, ModelScope, render_markdown_lines, wrap_unicode};
    use crate::app::UiRuntime;
    use futures_util::{future, stream};
    use owlen_core::{
        Provider, Result as CoreResult,
        config::Config,
        consent::ConsentScope,
        llm::LlmProvider,
        session::{ControllerEvent, SessionController},
        storage::StorageManager,
        types::{ChatRequest, ChatResponse, Message, ModelInfo, Role, ToolCall},
        ui::NoOpUiController,
    };
    use ratatui::style::Style;
    use ratatui::text::Line;
    use serde_json::json;
    use std::sync::Arc;
    use tempfile::tempdir;
    use tokio::sync::mpsc;

    fn lines_to_strings(lines: &[Line<'_>]) -> Vec<String> {
        lines
            .iter()
            .map(|line| {
                line.spans
                    .iter()
                    .map(|span| span.content.as_ref())
                    .collect::<String>()
            })
            .collect()
    }

    #[test]
    fn render_markdown_table_draws_grid_when_width_allows() {
        let lines = render_markdown_lines(
            "| Name | Role |\n| --- | --- |\n| Alice | Developer |\n",
            "",
            60,
            Style::default(),
        );
        let rendered = lines_to_strings(&lines);
        assert!(
            rendered.iter().any(|line| line.contains("Table (1 row):")),
            "summary line should mention row count"
        );
        assert!(
            rendered.iter().any(|line| line.contains('┌')),
            "grid border should be present when width permits"
        );
        assert!(
            rendered.iter().any(|line| line.contains("Alice")),
            "table rows should include cell content"
        );
    }

    #[test]
    fn render_markdown_table_falls_back_when_narrow() {
        let lines = render_markdown_lines(
            "| Name | Role |\n| --- | --- |\n| Alice | Developer |\n",
            "",
            12,
            Style::default(),
        );
        let rendered = lines_to_strings(&lines);
        assert!(
            rendered.iter().any(|line| line.contains("Name:")),
            "stacked fallback should label headers inline"
        );
        assert!(
            rendered.iter().all(|line| !line.contains('┌')),
            "narrow layout should avoid grid borders"
        );
    }

    #[test]
    fn wrap_unicode_respects_cjk_display_width() {
        let wrapped = wrap_unicode("你好世界", 4);
        assert_eq!(wrapped, vec!["你好".to_string(), "世界".to_string()]);
    }

    #[test]
    fn wrap_unicode_handles_emoji_graphemes() {
        let wrapped = wrap_unicode("🙂🙂🙂", 4);
        assert_eq!(wrapped, vec!["🙂🙂".to_string(), "🙂".to_string()]);
    }

    #[test]
    fn wrap_unicode_zero_width_returns_empty() {
        let wrapped = wrap_unicode("hello", 0);
        assert!(wrapped.is_empty());
    }

    #[test]
    fn extract_scope_status_includes_extended_metadata() {
        let models = vec![ModelInfo {
            id: "demo".to_string(),
            name: "Demo".to_string(),
            description: None,
            provider: "demo".to_string(),
            context_window: None,
            capabilities: vec![
                "scope:local".to_string(),
                "scope-status:local:available".to_string(),
                "scope-status-age:local:30".to_string(),
                "scope-status-success-age:local:5".to_string(),
                "scope-status-stale:local:1".to_string(),
                "scope-status-message:local:Cached copy".to_string(),
            ],
            supports_tools: false,
        }];

        let statuses = ChatApp::extract_scope_status(&models);
        let entry = statuses.get(&ModelScope::Local).expect("local scope entry");

        assert_eq!(entry.state, ModelAvailabilityState::Available);
        assert_eq!(entry.last_checked_secs, Some(30));
        assert_eq!(entry.last_success_secs, Some(5));
        assert!(entry.is_stale);
        assert_eq!(entry.message.as_deref(), Some("Cached copy"));
    }

    struct StubProvider;

    impl LlmProvider for StubProvider {
        type Stream = stream::Iter<std::vec::IntoIter<CoreResult<ChatResponse>>>;

        type ListModelsFuture<'a>
            = future::Ready<CoreResult<Vec<ModelInfo>>>
        where
            Self: 'a;

        type SendPromptFuture<'a>
            = future::Ready<CoreResult<ChatResponse>>
        where
            Self: 'a;

        type StreamPromptFuture<'a>
            = future::Ready<CoreResult<Self::Stream>>
        where
            Self: 'a;

        type HealthCheckFuture<'a>
            = future::Ready<CoreResult<()>>
        where
            Self: 'a;

        fn name(&self) -> &str {
            "stub-provider"
        }

        fn list_models(&self) -> Self::ListModelsFuture<'_> {
            future::ready(Ok(vec![]))
        }

        fn send_prompt(&self, _request: ChatRequest) -> Self::SendPromptFuture<'_> {
            let response = ChatResponse {
                message: Message::assistant("stub response".to_string()),
                usage: None,
                is_streaming: false,
                is_final: true,
            };
            future::ready(Ok(response))
        }

        fn stream_prompt(&self, _request: ChatRequest) -> Self::StreamPromptFuture<'_> {
            let response = ChatResponse {
                message: Message::assistant("stub response".to_string()),
                usage: None,
                is_streaming: false,
                is_final: true,
            };
            future::ready(Ok(stream::iter(vec![Ok(response)])))
        }

        fn health_check(&self) -> Self::HealthCheckFuture<'_> {
            future::ready(Ok(()))
        }
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn tool_consent_denied_generates_fallback_message() {
        let temp_dir = tempdir().expect("tempdir");
        let storage_path = temp_dir.path().join("owlen-test.db");
        let storage = Arc::new(
            StorageManager::with_database_path(storage_path)
                .await
                .expect("storage"),
        );

        let mut config = Config::default();
        config.privacy.encrypt_local_data = false;
        let provider: Arc<dyn Provider> = Arc::new(StubProvider);
        let ui = Arc::new(NoOpUiController);
        let (event_tx, controller_event_rx) = mpsc::unbounded_channel::<ControllerEvent>();

        let session = SessionController::new(provider, config, storage, ui, false, Some(event_tx))
            .await
            .expect("session");

        let (mut app, session_rx) = ChatApp::new(session, controller_event_rx)
            .await
            .expect("chat app");
        // Session events are not needed for this test
        drop(session_rx);

        let tool_call = ToolCall {
            id: "call-1".to_string(),
            name: "file_delete".to_string(),
            arguments: json!({"path": "/tmp/example.txt"}),
        };

        let message_id = app
            .controller
            .conversation_mut()
            .push_assistant_message("Preparing to modify files.");
        app.controller
            .conversation_mut()
            .set_tool_calls_on_message(message_id, vec![tool_call.clone()])
            .expect("tool calls");

        app.pending_tool_execution = Some((message_id, vec![tool_call.clone()]));
        app.controller.check_streaming_tool_calls(message_id);

        UiRuntime::poll_controller_events(&mut app).expect("poll controller events");

        let consent_state = app
            .pending_consent
            .as_ref()
            .expect("pending consent")
            .clone();

        assert_eq!(consent_state.tool_name, "file_delete");

        let resolution = app
            .controller
            .resolve_tool_consent(consent_state.request_id, ConsentScope::Denied)
            .expect("resolution");

        app.apply_tool_consent_resolution(resolution)
            .expect("apply resolution");

        assert!(app.pending_consent.is_none());
        assert!(app.pending_tool_execution.is_none());
        assert!(app.status.to_lowercase().contains("consent denied"));

        let conversation = app.controller.conversation();
        let last_message = conversation.messages.last().expect("last message");
        assert_eq!(last_message.role, Role::Assistant);
        assert!(
            last_message.content.contains("consent was denied"),
            "fallback message should acknowledge denial"
        );
    }
}

fn validate_relative_path(path: &Path, allow_nested: bool) -> Result<()> {
    if path.as_os_str().is_empty() {
        return Err(anyhow!("Path cannot be empty"));
    }
    if path.is_absolute() {
        return Err(anyhow!("Path must be relative to the workspace root"));
    }

    let mut normal_segments = 0usize;
    for component in path.components() {
        match component {
            Component::Normal(_) => {
                normal_segments += 1;
            }
            Component::CurDir => {
                return Err(anyhow!("Path cannot contain '.' segments"));
            }
            Component::ParentDir => {
                return Err(anyhow!("Path cannot contain '..' segments"));
            }
            Component::RootDir | Component::Prefix(_) => {
                return Err(anyhow!("Path must be relative to the workspace root"));
            }
        }
    }

    if !allow_nested && normal_segments > 1 {
        return Err(anyhow!("Name cannot include path separators"));
    }

    Ok(())
}

fn configure_textarea_defaults(textarea: &mut TextArea<'static>) {
    textarea.set_placeholder_text("Type your message here...");
    textarea.set_tab_length(4);

    textarea.set_style(
        Style::default()
            .remove_modifier(Modifier::UNDERLINED)
            .remove_modifier(Modifier::ITALIC)
            .remove_modifier(Modifier::BOLD),
    );
    textarea.set_cursor_style(Style::default());
    textarea.set_cursor_line_style(Style::default());
}

impl MessageState for ChatApp {}

#[async_trait]
impl UiRuntime for ChatApp {
    async fn handle_ui_event(&mut self, event: Event) -> Result<AppState> {
        ChatApp::handle_event(self, event).await
    }

    async fn handle_session_event(&mut self, event: SessionEvent) -> Result<()> {
        ChatApp::handle_session_event(self, event).await
    }

    async fn process_pending_llm_request(&mut self) -> Result<()> {
        ChatApp::process_pending_llm_request(self).await
    }

    async fn process_pending_tool_execution(&mut self) -> Result<()> {
        ChatApp::process_pending_tool_execution(self).await
    }

    fn poll_controller_events(&mut self) -> Result<()> {
        loop {
            match self.controller_event_rx.try_recv() {
                Ok(event) => self.handle_controller_event(event)?,
                Err(tokio::sync::mpsc::error::TryRecvError::Empty) => break,
                Err(tokio::sync::mpsc::error::TryRecvError::Disconnected) => break,
            }
        }
        Ok(())
    }

    fn advance_loading_animation(&mut self) {
        ChatApp::advance_loading_animation(self);
    }

    fn streaming_count(&self) -> usize {
        ChatApp::streaming_count(self)
    }
}