using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

/// <summary>
/// HOY Gallery V2 — GalleryManager
/// 
/// Reads manifest.json (with exact Spatial world coordinates) and places
/// each ArtworkFrame at the precise position/rotation/scale extracted from
/// Carmen Hoyos' Spatial scene-data.json.
///
/// Room geometry: Spatial "Isle Gallery" preset (environment 8)
/// Reconstructed from artwork positions found in the scene data:
///
///   Central hall:   X ≈ -9 to +9,   Z ≈ -16 to +5    (width ~18 m, depth ~21 m)
///   West wing:      X ≈ -22 to -13, Z ≈ -16 to +5    (width ~9 m)
///   East wing:      X ≈ +13 to +22, Z ≈ -16 to +5    (width ~9 m)
///   Ceiling height: ~5.5 m (estimated from artwork Y ≈ 2.2 m centre)
///
/// Spawn point: (-0.36, 0, -2.34) facing ~north (from scene JSON)
/// </summary>
public class GalleryManager : MonoBehaviour
{
    [Header("Prefabs")]
    public GameObject artworkFramePrefab;

    [Header("Materials")]
    public Material wallMaterial;
    public Material floorMaterial;
    public Material ceilingMaterial;

    [Header("Lighting")]
    public Light mainDirectionalLight;

    // ── Room geometry constants (Isle Gallery reconstruction) ─────────────────
    // Central hall
    const float HALL_W      = 18f;   // X: -9 to +9
    const float HALL_D      = 22f;   // Z: -17 to +5
    const float HALL_X      = 0f;
    const float HALL_Z      = -6f;   // centre of Z range

    // Side wings (same depth as hall, narrower)
    const float WING_W      = 9f;    // X width of each wing
    const float WING_D      = 22f;   // Z depth matches hall
    const float WING_E_X    = 18f;   // East wing centre X  (+13 to +22 → centre ~17.5)
    const float WING_W_X    = -18f;  // West wing centre X  (-22 to -13 → centre ~-17.5)
    const float WING_Z      = -6f;   // same Z centre as hall

    // Connecting corridors between hall and wings (fill the gap)
    const float CORR_W      = 4f;
    const float CORR_D      = HALL_D;

    const float CEILING_H   = 5.5f;
    const float FLOOR_Y     = 0f;

    void Start()
    {
        BuildRoom();
        SetupLighting();
        StartCoroutine(LoadManifest());
    }

    // ── Room construction ─────────────────────────────────────────────────────
    void BuildRoom()
    {
        var root = new GameObject("Room");
        root.transform.SetParent(transform);

        // ── Central hall ──────────────────────────────────────────────────────
        MakePlane(root, "Floor_Hall",   new Vector3(HALL_X, FLOOR_Y,  HALL_Z),  new Vector3(0,0,0),     HALL_W, HALL_D, floorMaterial);
        MakePlane(root, "Ceil_Hall",    new Vector3(HALL_X, CEILING_H,HALL_Z),  new Vector3(180,0,0),   HALL_W, HALL_D, ceilingMaterial);
        MakePlane(root, "Wall_N_Hall",  new Vector3(HALL_X, CEILING_H/2f, -17f),new Vector3(90,180,0),  HALL_W, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_S_Hall",  new Vector3(HALL_X, CEILING_H/2f,  5f), new Vector3(90,0,0),    HALL_W, CEILING_H, wallMaterial);
        // Inner walls facing the hall (between hall and wings, partial)
        MakePlane(root, "Wall_IE_Hall", new Vector3( 9f, CEILING_H/2f, HALL_Z), new Vector3(90,270,0),  HALL_D, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_IW_Hall", new Vector3(-9f, CEILING_H/2f, HALL_Z), new Vector3(90,90,0),   HALL_D, CEILING_H, wallMaterial);

        // ── East wing ─────────────────────────────────────────────────────────
        MakePlane(root, "Floor_E",   new Vector3(WING_E_X, FLOOR_Y,  WING_Z),  new Vector3(0,0,0),    WING_W, WING_D, floorMaterial);
        MakePlane(root, "Ceil_E",    new Vector3(WING_E_X, CEILING_H,WING_Z),  new Vector3(180,0,0),  WING_W, WING_D, ceilingMaterial);
        MakePlane(root, "Wall_N_E",  new Vector3(WING_E_X, CEILING_H/2f,-17f), new Vector3(90,180,0), WING_W, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_S_E",  new Vector3(WING_E_X, CEILING_H/2f,  5f), new Vector3(90,0,0),   WING_W, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_Ext_E",new Vector3(22.5f, CEILING_H/2f,WING_Z),  new Vector3(90,270,0), WING_D, CEILING_H, wallMaterial);

        // ── West wing ─────────────────────────────────────────────────────────
        MakePlane(root, "Floor_W",   new Vector3(WING_W_X, FLOOR_Y,  WING_Z),  new Vector3(0,0,0),   WING_W, WING_D, floorMaterial);
        MakePlane(root, "Ceil_W",    new Vector3(WING_W_X, CEILING_H,WING_Z),  new Vector3(180,0,0), WING_W, WING_D, ceilingMaterial);
        MakePlane(root, "Wall_N_W",  new Vector3(WING_W_X, CEILING_H/2f,-17f), new Vector3(90,180,0),WING_W, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_S_W",  new Vector3(WING_W_X, CEILING_H/2f,  5f), new Vector3(90,0,0),  WING_W, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_Ext_W",new Vector3(-22.5f,CEILING_H/2f,WING_Z),  new Vector3(90,90,0), WING_D, CEILING_H, wallMaterial);

        // ── Partial interior walls (X ≈ ±14) facing wings ────────────────────
        // These are the inner faces of the wing walls visible from the hall
        MakePlane(root, "Wall_IE_Wing", new Vector3(14f, CEILING_H/2f, WING_Z), new Vector3(90,90,0),  WING_D, CEILING_H, wallMaterial);
        MakePlane(root, "Wall_IW_Wing", new Vector3(-14f,CEILING_H/2f, WING_Z), new Vector3(90,270,0), WING_D, CEILING_H, wallMaterial);

        // ── Floor boxing / skirting colliders (invisible, stop player clipping)
        AddWallCollider(root, "Col_N",  new Vector3(0,    1f, -17.5f), new Vector3(50f, 2f, 0.3f));
        AddWallCollider(root, "Col_S",  new Vector3(0,    1f,   5.5f), new Vector3(50f, 2f, 0.3f));
        AddWallCollider(root, "Col_EE", new Vector3(23f,  1f,  WING_Z), new Vector3(0.3f, 2f, WING_D));
        AddWallCollider(root, "Col_WW", new Vector3(-23f, 1f,  WING_Z), new Vector3(0.3f, 2f, WING_D));
    }

    void MakePlane(GameObject parent, string name, Vector3 pos, Vector3 euler, float w, float d, Material mat)
    {
        var go = GameObject.CreatePrimitive(PrimitiveType.Plane);
        go.name = name;
        go.transform.SetParent(parent.transform);
        go.transform.position = pos;
        go.transform.eulerAngles = euler;
        go.transform.localScale = new Vector3(w * 0.1f, 1f, d * 0.1f);
        Destroy(go.GetComponent<MeshCollider>());
        if (mat != null) go.GetComponent<Renderer>().sharedMaterial = mat;
    }

    void AddWallCollider(GameObject parent, string name, Vector3 pos, Vector3 size)
    {
        var go = new GameObject(name);
        go.transform.SetParent(parent.transform);
        go.transform.position = pos;
        var col = go.AddComponent<BoxCollider>();
        col.size = size;
    }

    // ── Lighting ──────────────────────────────────────────────────────────────
    void SetupLighting()
    {
        RenderSettings.ambientMode  = UnityEngine.Rendering.AmbientMode.Flat;
        RenderSettings.ambientLight = new Color(0.9f, 0.9f, 0.9f);

        if (mainDirectionalLight != null)
        {
            mainDirectionalLight.intensity   = 0.3f;
            mainDirectionalLight.color       = Color.white;
            mainDirectionalLight.shadows     = LightShadows.None;
            mainDirectionalLight.transform.eulerAngles = new Vector3(60, -20, 0);
        }

        // Track lights grid covering all three zones
        SpawnTrackLights();
    }

    void SpawnTrackLights()
    {
        // Central hall
        float[] hx = { -6f, -2f, 2f, 6f };
        float[] hz = { -14f, -10f, -6f, -2f, 2f };
        foreach (var x in hx) foreach (var z in hz) AddPointLight(x, CEILING_H - 0.2f, z, 1.0f, 7f);

        // East wing
        float[] ex = { 15f, 18f, 21f };
        float[] ez = { -14f, -8f, -2f, 3f };
        foreach (var x in ex) foreach (var z in ez) AddPointLight(x, CEILING_H - 0.2f, z, 0.9f, 6f);

        // West wing
        float[] wx = { -15f, -18f, -21f };
        foreach (var x in wx) foreach (var z in ez) AddPointLight(x, CEILING_H - 0.2f, z, 0.9f, 6f);
    }

    void AddPointLight(float x, float y, float z, float intensity, float range)
    {
        var go = new GameObject("TL");
        go.transform.SetParent(transform);
        go.transform.position = new Vector3(x, y, z);
        var l = go.AddComponent<Light>();
        l.type      = LightType.Point;
        l.color     = new Color(1f, 0.97f, 0.92f);
        l.intensity = intensity;
        l.range     = range;
        l.shadows   = LightShadows.None;
    }

    // ── Manifest loading ──────────────────────────────────────────────────────
    IEnumerator LoadManifest()
    {
        string path = System.IO.Path.Combine(Application.streamingAssetsPath, "manifest.json");

#if UNITY_WEBGL && !UNITY_EDITOR
        using var req = UnityWebRequest.Get(path);
        yield return req.SendWebRequest();
        if (req.result != UnityWebRequest.Result.Success)
        {
            Debug.LogError($"[HOY] Manifest load failed: {req.error}");
            yield break;
        }
        SpawnArtworks(JsonUtility.FromJson<GalleryManifest>(req.downloadHandler.text));
#else
        if (!System.IO.File.Exists(path)) { Debug.LogError($"[HOY] manifest.json not found: {path}"); yield break; }
        SpawnArtworks(JsonUtility.FromJson<GalleryManifest>(System.IO.File.ReadAllText(path)));
        yield return null;
#endif
    }

    void SpawnArtworks(GalleryManifest manifest)
    {
        if (manifest?.artworks == null) return;

        foreach (var a in manifest.artworks)
        {
            if (a.file.Contains("NEEDS_MAPPING")) 
            {
                Debug.LogWarning($"[HOY] Skipping unmapped artwork: spatialId={a.spatialId}");
                continue;
            }

            var pos = new Vector3(a.position.x, a.position.y, a.position.z);
            var rot = Quaternion.Euler(0, a.rotationY, 0);

            var go = Instantiate(artworkFramePrefab, pos, rot, transform);
            go.name = $"Frame_{a.spatialId}_{a.title}";
            go.transform.localScale = Vector3.one * a.scale;

            var frame = go.GetComponent<ArtworkFrame>();
            frame?.Initialise(a);
        }

        Debug.Log($"[HOY] Spawned artworks from Spatial coordinates.");
    }
}

// ── Data classes ──────────────────────────────────────────────────────────────
[Serializable] public class GalleryManifest
{
    public ArtworkData[] artworks;
}

[Serializable] public class ArtworkData
{
    public string spatialId;
    public string title;
    public string artist;
    public string type;       // "video" | "image"
    public string file;       // "Videos/xxx.mp4" | "Images/xxx.jpeg"
    public SpatialPosition position;
    public float  rotationY;
    public float  scale;
    public string comment;    // "NEEDS_FILE" or ""
}

[Serializable] public class SpatialPosition
{
    public float x, y, z;
}