using Cysharp.Threading.Tasks;
using HxGame.Data;
using System.Collections;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
using System.Threading;
using UnityEngine;
using System.Linq;

public partial class MapManager : MonoBehaviour
{
    [SerializeField]
    private Transform mapRegionParent;

    public Transform mapGridParent;
    public Transform mapAreaParent;
    public Transform mapMonsterArea;
    public Transform mapNPCArea;
    public Transform mapTeleportArea;
    public Transform mapReliveArea;
    public Transform mapAudioTrigger;
    public Dictionary<string, (int maxRow, int maxCol)> allMaps = new Dictionary<string, (int maxRow, int maxCol)>();

    /// <summary>
    /// 当前地图区域
    /// </summary>
    public MapRegions _curMapRegions;
    /// <summary>
    /// 保存地图配置
    /// </summary>
    /// <param name="mapId"></param>
    public void SaveRegionXML()
    {
        int mapId = _curOpenMapId;
        if (!allMaps.TryGetValue(_curOpenMapId.ToString(), out var curMap))
        {
            UIWindow.Instance.ShowMessage($"没有扫描到当前地图 [{_curOpenMapId}]");
            return;
        }
        _curMapRegions?.SaveXML(mapId);
    }

    public void SaveAtlasToFile()
    {
        int atlasWidth = _curMapRegions.regionRowNum * (int)_curMapRegions.regionWidth;
        int atlasHeight = _curMapRegions.regionColNum * (int)_curMapRegions.regionHeight;
        if (atlasWidth < 8192)
        {
            SaveAtlasToFileSmall();
            return;
        }
        // 使用内存优化的Bitmap构造
        Bitmap atlas = new Bitmap(atlasWidth, atlasHeight, PixelFormat.Format24bppRgb);

        using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(atlas))
        {
            g.Transform = new System.Drawing.Drawing2D.Matrix(1, 0, 0, -1, 0, atlas.Height);
            for (int row = 0; row < _curMapRegions.regionRowNum; row++)
            {
                for (int col = 0; col < _curMapRegions.regionColNum; col++)
                {
                    Texture2D tileTex = _curMapRegions.regions[row, col].texture;
                    if (tileTex == null) continue;

                    Bitmap tileBitmap = TextureToBitmap(tileTex);
                    g.DrawImage(
                        tileBitmap,
                        row * (int)_curMapRegions.regionWidth,
                        col * (int)_curMapRegions.regionHeight
                    );
                    tileBitmap.Dispose();
                }
            }
        }

        // 保存为高质量JPG（无Alpha时）
        string outputPath = $"{PathUtil.GetBigMapPath(_curOpenMapId)}/map_{_curOpenMapId}.jpg";
        atlas.Save(outputPath, ImageFormat.Jpeg);
        atlas.Dispose();

        Debug.Log($"导出成功！尺寸: {atlasWidth}x{atlasHeight}");
        UIWindow.Instance.ShowMessage("地图导出成功");
    }

    private Bitmap TextureToBitmap(Texture2D texture)
    {
        bool hasAlpha = texture.GetPixels().Any(c => c.a < 1f);
        Bitmap bitmap = new Bitmap(
            texture.width,
            texture.height,
            hasAlpha ? PixelFormat.Format32bppArgb : PixelFormat.Format24bppRgb
        );

        BitmapData data = bitmap.LockBits(
            new Rectangle(0, 0, texture.width, texture.height),
            ImageLockMode.WriteOnly,
            bitmap.PixelFormat
        );

        byte[] bytes = new byte[texture.width * texture.height * (hasAlpha ? 4 : 3)];
        UnityEngine.Color[] pixels = texture.GetPixels();

        for (int i = 0; i < pixels.Length; i++)
        {
            bytes[i * (hasAlpha ? 4 : 3)] = (byte)(pixels[i].b * 255);     // B
            bytes[i * (hasAlpha ? 4 : 3) + 1] = (byte)(pixels[i].g * 255); // G
            bytes[i * (hasAlpha ? 4 : 3) + 2] = (byte)(pixels[i].r * 255); // R
            if (hasAlpha) bytes[i * 4 + 3] = (byte)(pixels[i].a * 255);    // A
        }

        System.Runtime.InteropServices.Marshal.Copy(bytes, 0, data.Scan0, bytes.Length);
        bitmap.UnlockBits(data);
        return bitmap;
    }
    public void SaveAtlasToFileSmall()
    {
        // 计算大图的尺寸
        int atlasWidth = _curMapRegions.regionRowNum * (int)_curMapRegions.regionWidth;
        int atlasHeight = _curMapRegions.regionColNum * (int)_curMapRegions.regionHeight;

        // 创建空的大图
        Texture2D atlas = new Texture2D(atlasWidth, atlasHeight);
        atlas.filterMode = FilterMode.Bilinear; // 设置抗锯齿

        // 遍历所有小图并合并
        for (int row = 0; row < _curMapRegions.regionRowNum; row++)
        {
            for (int col = 0; col < _curMapRegions.regionColNum; col++)
            {
                HxGame.Data.Region region = _curMapRegions.regions[row, col];
                Texture2D tileTex = region.texture; // 加载小图纹理
                atlas.SetPixels(
                    row * (int)_curMapRegions.regionWidth,
                    col * (int)_curMapRegions.regionHeight,
                    (int)_curMapRegions.regionWidth,
                    (int)_curMapRegions.regionHeight,
                    tileTex.GetPixels()
                );
            }
        }

        atlas.Apply(); // 应用像素更改
        byte[] pngData = atlas.EncodeToJPG();
        File.WriteAllBytes($"{PathUtil.GetBigMapPath(_curOpenMapId)}/map_{_curOpenMapId}.jpg", pngData);
        UIWindow.Instance.ShowMessage("地图导出成功");
    }
    public void LoadMapRegionSprites(int mapId)
    {
        if (!allMaps.TryGetValue(mapId.ToString(),out var mapInfo))
        {
            UIWindow.Instance.ShowMessage("地图不存在。。。");
            return;
        }
        int mapRownum = mapInfo.maxRow;
        int mapColumn = mapInfo.maxCol;
        _curMapRegions = new MapRegions();
        _curOpenMapId = mapId;
        _curMapRegions.regionRowNum = mapRownum;
        _curMapRegions.regionColNum = mapColumn;
        _curMapRegions.regionWidth = PicMapPixel;
        _curMapRegions.regionHeight = PicMapPixel;
        _curMapRegions.cellWidthPixel = widthPixel;
        _curMapRegions.cellHeightPixel = heightPixel;
        _curMapRegions.regions = new HxGame.Data.Region[mapRownum, mapColumn];

        int maxRow = mapColumn;
        int maxCol = mapRownum;
        float jpgscenew = PicMapPixel / 100.0f;

        for (int row = 0; row < mapRownum; row++) //14 * 11
        {
            for (int col = 0; col < mapColumn; col++)
            {
                string filename = $"v{mapId}_r{mapColumn - col}_c{row + 1}";  // 构造文件名，v1000_r11_c1.jpg
                string spPath = PathUtil.GetMapTexure(mapId, filename, "jpg");
                GameObject obj = new GameObject(filename);
                obj.transform.SetParent(mapRegionParent);
                SpriteRenderer sr = obj.AddComponent<SpriteRenderer>();
                float x = row * jpgscenew;
                float y = col * jpgscenew;
                obj.transform.position = new Vector2(x, y);
                _curMapRegions.regions[row, col] = new HxGame.Data.Region();
                _curMapRegions.regions[row, col].indexX = row;
                _curMapRegions.regions[row, col].indexY = col;
                multithreadLoadTextrue(spPath, sr, _curMapRegions.regions[row, col]);
                _curMapRegions.regions[row, col].regionName = filename;
            }   
        }
        MapManager.Instance.ReseCamera(jpgscenew * mapColumn, jpgscenew * mapRownum);
    }
    public void ClearMapRegions()
    {
        ClearMapGrid();
        foreach (Transform child in mapRegionParent)
        {
            Destroy(child.gameObject);
        }
    }

    public void CreateObs(int mapid)
    {
        if(_curMapRegions == null) return;
        float jpgscenew = PicMapPixel / 100.0f;
        MapManager.Instance.GenerateMap(mapid, jpgscenew * _curMapRegions.regionRowNum, jpgscenew * _curMapRegions.regionColNum, _curMapRegions.cellWidthPixel / 100.0f, _curMapRegions.cellHeightPixel / 100.0f);
    }
    private async void multithreadLoadTextrue(string fullPath,SpriteRenderer sr, HxGame.Data.Region region)
    {
        var texture = await loadASyncTexture2D(fullPath, this.GetCancellationTokenOnDestroy());
        if (texture != null)
        {
            sr.sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), Vector2.zero, 100f);
        }
        region.texture = texture;
    }

    private UniTask<Texture2D> loadASyncTexture2D(string fullPath,CancellationToken token)
    {
        return UniTask.RunOnThreadPool(async () =>
        {
            if (!File.Exists(fullPath))
            {
                Debug.LogError($"File not found: {fullPath}");
                return null;
            }
            // 在线程池中异步读取文件
            byte[] bytes = await File.ReadAllBytesAsync(fullPath, token);
            // 切换到主线程处理纹理
            await UniTask.Yield(PlayerLoopTiming.Update);
            Texture2D texture = new Texture2D(2, 2); // 初始大小
            if (texture.LoadImage(bytes))
            {
                return texture;
            }
            else
            {
                Debug.LogError($"Failed to load image from {fullPath}");
                return null;
            }
        });
    }
    IEnumerator LoadSpriteT(string spName, GameObject go, SpriteRenderer sprite)
    {
        if (File.Exists(spName))
        {
            byte[] bytes = File.ReadAllBytes(spName);
            Texture2D texture = new Texture2D(2, 2); // 初始大小，稍后调整
            if (texture.LoadImage(bytes)) // 解码 JPG 到 Texture2D
            {
                sprite.sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), Vector2.zero, 100f);
                Debug.Log($"Loaded {spName} successfully");
            }
            else
            {
                Debug.LogError($"Failed to load image from {spName}");
            }
        }
        else
        {
            Debug.LogError($"File not found: {spName}");
        }
        yield break;
        //using (UnityWebRequest req = UnityWebRequestTexture.GetTexture(spName))
        //{
        //    yield return req.SendWebRequest();
        //    if (req.result == UnityWebRequest.Result.Success)
        //    {
        //        Texture2D tt = DownloadHandlerTexture.GetContent(req);
        //        if (tt == null)
        //            yield break;
        //        sprite.sprite = Sprite.Create(tt, new Rect(0, 0, tt.width, tt.height), Vector2.zero, 100f);
        //    }
        //    else
        //    {
        //        UIWindow.Instance.ShowMessage(req.error);
        //    }
        //}
    }

}