using System;
using System.IO;
using System.Reflection;
using System.Text;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.SceneManagement;

[DisallowMultipleComponent]
public sealed class RuntimeBootProbe : MonoBehaviour
{
    [Header("Optional References")]
    [SerializeField] private GameObject hudRoot;
    [SerializeField] private GeoTileAddressablesLoader geoTileLoader;
    [SerializeField] private Transform expectedPlayer;

    [Header("Probe Settings")]
    [SerializeField] private bool logOnAwake = true;
    [SerializeField] private bool logOnStart = true;
    [SerializeField] private bool logAfterDelay = true;
    [SerializeField] private float delayedLogSeconds = 2.0f;

    private void Awake()
    {
        if (logOnAwake)
            Dump("Awake");
    }

    private void Start()
    {
        if (logOnStart)
            Dump("Start");

        if (logAfterDelay && delayedLogSeconds > 0.0f)
            Invoke(nameof(DumpDelayed), delayedLogSeconds);
    }

    private void DumpDelayed()
    {
        Dump("Delayed");
    }

    private void Dump(string phase)
    {
        var sb = new StringBuilder(1024);
        sb.Append("[RuntimeBootProbe] ").Append(phase).Append(" ");
        sb.Append("activeScene=").Append(SceneManager.GetActiveScene().name).Append(" ");
        sb.Append("loadedScenes=").Append(SceneManager.sceneCount).Append(" ");
        sb.Append("persistentDataPath=").Append(Application.persistentDataPath).Append(" ");

        if (hudRoot == null)
        {
            sb.Append("hudRoot=null ");
        }
        else
        {
            sb.Append("hudRoot.activeInHierarchy=").Append(hudRoot.activeInHierarchy).Append(" ");
            sb.Append("hudRoot.activeSelf=").Append(hudRoot.activeSelf).Append(" ");
        }

        if (expectedPlayer == null)
        {
            sb.Append("expectedPlayer=null ");
        }
        else
        {
            Vector3 p = expectedPlayer.position;
            sb.Append("expectedPlayer.pos=(")
                .Append(p.x.ToString("F2")).Append(",")
                .Append(p.y.ToString("F2")).Append(",")
                .Append(p.z.ToString("F2")).Append(") ");
        }

        if (geoTileLoader == null)
        {
            sb.Append("geoTileLoader=null ");
            AppendRenderState(sb);
            Debug.Log(sb.ToString());
            return;
        }

        bool loaderEnabled = geoTileLoader.enabled && geoTileLoader.gameObject.activeInHierarchy;
        sb.Append("geoTileLoader.enabled=").Append(loaderEnabled).Append(" ");

        string tileBundleFolderName = ReadPrivateField(geoTileLoader, "tileBundleFolderName", "TileBundles");
        string manifestFileName = ReadPrivateField(geoTileLoader, "manifestFileName", "TileManifest.json");
        string buildingManifestFileName = ReadPrivateField(geoTileLoader, "buildingManifestFileName", "TileBuildingsManifest.json");
        string buildTargetFolderOverride = ReadPrivateField(geoTileLoader, "buildTargetFolderOverride", "");

        string buildTargetFolder = string.IsNullOrWhiteSpace(buildTargetFolderOverride)
            ? GetBuildTargetFolderName()
            : buildTargetFolderOverride;

        string basePath = Path.Combine(Application.persistentDataPath, tileBundleFolderName, buildTargetFolder);
        string manifestPath = Path.Combine(basePath, manifestFileName);
        string buildingsManifestPath = Path.Combine(basePath, buildingManifestFileName);
        string catalogPath = ResolveCatalogPath(manifestPath);

        sb.Append("basePath=").Append(basePath).Append(" ");
        sb.Append("manifestExists=").Append(File.Exists(manifestPath)).Append(" ");
        sb.Append("buildingsManifestExists=").Append(File.Exists(buildingsManifestPath)).Append(" ");

        if (!string.IsNullOrWhiteSpace(catalogPath))
            sb.Append("catalogExists=").Append(File.Exists(catalogPath)).Append(" ");
        else
            sb.Append("catalogExists=unknown ");

        AppendRenderState(sb);
        Debug.Log(sb.ToString());
    }

    private static void AppendRenderState(StringBuilder sb)
    {
        var rp = GraphicsSettings.currentRenderPipeline;
        string rpName = rp != null ? $"{rp.name} ({rp.GetType().Name})" : "BuiltInRenderPipeline";
        int qualityIndex = QualitySettings.GetQualityLevel();
        string qualityName = qualityIndex >= 0 && qualityIndex < QualitySettings.names.Length
            ? QualitySettings.names[qualityIndex]
            : "<unknown>";

        sb.Append("quality=").Append(qualityIndex).Append(":").Append(qualityName).Append(" ");
        sb.Append("renderPipeline=").Append(rpName).Append(" ");

        var cam = Camera.main;
        if (cam == null)
        {
            sb.Append("mainCamera=<none> ");
        }
        else
        {
            sb.Append("mainCamera=").Append(cam.name).Append(" ");
            sb.Append("mainCamera.farClip=").Append(cam.farClipPlane.ToString("F1")).Append(" ");
            sb.Append("mainCamera.nearClip=").Append(cam.nearClipPlane.ToString("F3")).Append(" ");
            sb.Append("mainCamera.cullingMask=0x").Append(cam.cullingMask.ToString("X")).Append(" ");
        }

        AppendXrState(sb);
    }

    private static void AppendXrState(StringBuilder sb)
    {
        try
        {
            Type xrSettingsType = Type.GetType("UnityEngine.XR.XRSettings, UnityEngine.XRModule");
            if (xrSettingsType == null)
            {
                sb.Append("xrEnabled=<unavailable> ");
                return;
            }

            var enabledProp = xrSettingsType.GetProperty("enabled", BindingFlags.Public | BindingFlags.Static);
            bool xrEnabled = enabledProp != null && enabledProp.GetValue(null) is bool enabled && enabled;
            sb.Append("xrEnabled=").Append(xrEnabled).Append(" ");

            if (!xrEnabled)
                return;

            var stereoModeProp = xrSettingsType.GetProperty("stereoRenderingMode", BindingFlags.Public | BindingFlags.Static);
            object stereoMode = stereoModeProp?.GetValue(null);
            sb.Append("xrStereoMode=").Append(stereoMode != null ? stereoMode.ToString() : "<unknown>").Append(" ");
        }
        catch
        {
            sb.Append("xrEnabled=<error> ");
        }
    }

    private static string ReadPrivateField(GeoTileAddressablesLoader loader, string fieldName, string fallback)
    {
        try
        {
            FieldInfo fi = typeof(GeoTileAddressablesLoader).GetField(fieldName, BindingFlags.Instance | BindingFlags.NonPublic);
            if (fi == null)
                return fallback;

            object value = fi.GetValue(loader);
            return value as string ?? fallback;
        }
        catch
        {
            return fallback;
        }
    }

    private static string ResolveCatalogPath(string manifestPath)
    {
        try
        {
            if (!File.Exists(manifestPath))
                return null;

            string json = File.ReadAllText(manifestPath);
            TileManifest manifest = JsonUtility.FromJson<TileManifest>(json);
            if (manifest == null || string.IsNullOrWhiteSpace(manifest.catalogFile))
                return null;

            return Path.Combine(Path.GetDirectoryName(manifestPath) ?? string.Empty, manifest.catalogFile);
        }
        catch
        {
            return null;
        }
    }

    private static string GetBuildTargetFolderName()
    {
        switch (Application.platform)
        {
            case RuntimePlatform.Android:
                return "Android";
            case RuntimePlatform.WindowsPlayer:
            case RuntimePlatform.WindowsEditor:
                return "StandaloneWindows64";
            case RuntimePlatform.OSXPlayer:
            case RuntimePlatform.OSXEditor:
                return "StandaloneOSX";
            case RuntimePlatform.LinuxPlayer:
            case RuntimePlatform.LinuxEditor:
                return "StandaloneLinux64";
            default:
                return "Android";
        }
    }
}