gnoma/internal/elf/manager.go

package elf

import (
	"context"
	"fmt"
	"log/slog"
	"sync"

	"somegit.dev/Owlibou/gnoma/internal/engine"
	"somegit.dev/Owlibou/gnoma/internal/provider"
	"somegit.dev/Owlibou/gnoma/internal/router"
	"somegit.dev/Owlibou/gnoma/internal/tool"
)

// Manager spawns, tracks, and manages elfs.
type Manager struct {
	mu     sync.RWMutex
	elfs   map[string]Elf
	router *router.Router
	tools  *tool.Registry
	logger *slog.Logger
}

type ManagerConfig struct {
	Router *router.Router
	Tools  *tool.Registry
	Logger *slog.Logger
}

func NewManager(cfg ManagerConfig) *Manager {
	logger := cfg.Logger
	if logger == nil {
		logger = slog.Default()
	}
	return &Manager{
		elfs:   make(map[string]Elf),
		router: cfg.Router,
		tools:  cfg.Tools,
		logger: logger,
	}
}

// Spawn creates a new background elf with a router-selected provider.
// The elf gets its own engine, history, and tools — no shared state.
func (m *Manager) Spawn(ctx context.Context, taskType router.TaskType, prompt, systemPrompt string) (Elf, error) {
	// Ask router for the best arm for this task type
	task := router.Task{
		Type:            taskType,
		RequiresTools:   true,
		Priority:        router.PriorityNormal,
		EstimatedTokens: 4000,
	}

	decision := m.router.Select(task)
	if decision.Error != nil {
		return nil, fmt.Errorf("no arm available for elf: %w", decision.Error)
	}

	arm := decision.Arm
	m.logger.Info("spawning elf",
		"arm", arm.ID,
		"task_type", taskType,
		"model", arm.ModelName,
	)

	// Create independent engine for the elf
	eng, err := engine.New(engine.Config{
		Provider: arm.Provider,
		Tools:    m.tools,
		System:   systemPrompt,
		Model:    arm.ModelName,
		MaxTurns: 20,
		Logger:   m.logger,
	})
	if err != nil {
		return nil, fmt.Errorf("create elf engine: %w", err)
	}

	elf := SpawnBackground(eng, prompt)

	m.mu.Lock()
	m.elfs[elf.ID()] = elf
	m.mu.Unlock()

	m.logger.Info("elf spawned", "id", elf.ID(), "arm", arm.ID)
	return elf, nil
}

// SpawnWithProvider creates an elf using a specific provider (bypasses router).
func (m *Manager) SpawnWithProvider(prov provider.Provider, model, prompt, systemPrompt string) (Elf, error) {
	eng, err := engine.New(engine.Config{
		Provider: prov,
		Tools:    m.tools,
		System:   systemPrompt,
		Model:    model,
		MaxTurns: 20,
		Logger:   m.logger,
	})
	if err != nil {
		return nil, fmt.Errorf("create elf engine: %w", err)
	}

	elf := SpawnBackground(eng, prompt)

	m.mu.Lock()
	m.elfs[elf.ID()] = elf
	m.mu.Unlock()

	m.logger.Info("elf spawned (direct)", "id", elf.ID(), "model", model)
	return elf, nil
}

// Get returns an elf by ID.
func (m *Manager) Get(id string) (Elf, bool) {
	m.mu.RLock()
	defer m.mu.RUnlock()
	e, ok := m.elfs[id]
	return e, ok
}

// List returns all tracked elfs.
func (m *Manager) List() []Elf {
	m.mu.RLock()
	defer m.mu.RUnlock()
	elfs := make([]Elf, 0, len(m.elfs))
	for _, e := range m.elfs {
		elfs = append(elfs, e)
	}
	return elfs
}

// Active returns elfs that are still running.
func (m *Manager) Active() []Elf {
	m.mu.RLock()
	defer m.mu.RUnlock()
	var active []Elf
	for _, e := range m.elfs {
		if e.Status() == StatusRunning {
			active = append(active, e)
		}
	}
	return active
}

// CancelAll cancels all running elfs.
func (m *Manager) CancelAll() {
	m.mu.RLock()
	defer m.mu.RUnlock()
	for _, e := range m.elfs {
		if e.Status() == StatusRunning {
			e.Cancel()
		}
	}
}

// WaitAll waits for all elfs to complete and returns their results.
func (m *Manager) WaitAll() []Result {
	elfs := m.List()
	results := make([]Result, len(elfs))
	var wg sync.WaitGroup

	for i, e := range elfs {
		wg.Add(1)
		go func(idx int, elf Elf) {
			defer wg.Done()
			results[idx] = elf.Wait()
		}(i, e)
	}

	wg.Wait()
	return results
}

// Cleanup removes completed/failed/cancelled elfs from tracking.
func (m *Manager) Cleanup() {
	m.mu.Lock()
	defer m.mu.Unlock()
	for id, e := range m.elfs {
		s := e.Status()
		if s == StatusCompleted || s == StatusFailed || s == StatusCancelled {
			delete(m.elfs, id)
		}
	}
}