using UnityEngine;
using System.Collections.Generic;
using System;
using UnityEngine.U2D;
using System.IO;
using UnityEngine.Video;
using Spine.Unity;
using UnityEngine.UI;
using Cysharp.Threading.Tasks;
using System.Threading;
using ProjSG.Resource;
using YooAsset;






#if UNITY_EDITOR
using UnityEditor;
#endif

using LaunchCommon;

public class ResManager : Singleton<ResManager>
{
    

    //不下载时本地安卓测试路径
    // public string assetBundlesPath = Application.dataPath + "/../AssetBundles/Android/";
    // public static string bytesFolderName = "logicbytes/";
    public string StreamingAssetPath
    {
        get
        {
            return ResourcesPath.Instance.StreamingAssetPath;
        }
    }
    public string ExternalStorePath 
    {
        get
        {
            return ResourcesPath.Instance.ExternalStorePath;
        }
    }

    //用于editor 下的资源路径
    public string ResourcesOutPath 
    {
        get
        {
            return ResourcesPath.ResourcesOutPath;
        }
    }

    public string CONFIG_FODLER
    {
        get
        {
            return ResourcesPath.CONFIG_FODLER;
        }
    }

    public string ResourcesOutAssetPath
    {
        get
        {
            return ResourcesPath.ResourcesOutAssetPath;
        }
    }
    
    private static readonly Dictionary<Type, string> fileExtensionDict = new Dictionary<Type, string>()
    {
        {typeof(GameObject), "prefab"},
        {typeof(Sprite), "png"},
        {typeof(Texture2D), "jpg"},
        {typeof(Texture), "jpg"},
        {typeof(Shader), "shader"},
        {typeof(TextAsset), "txt"},
        {typeof(AudioClip), "wav"},
        {typeof(Font), "ttf"},
        {typeof(Material), "mat"},
        {typeof(VideoClip), "mp4"},
        {typeof(SpriteAtlas), "spriteatlasv2"},
        {typeof(SkeletonDataAsset), "asset"},
    };


    public void Init()
    {
        
    }

    public void Release()
    {

    }
    
    private string GetExtension(Type type)
    {
        if (fileExtensionDict.TryGetValue(type, out string extension))
            return "." + extension;
        else
        {
            Debug.LogErrorFormat("GetExtension() => 不支持的资源类型: {0}.", type.Name);
            return "";
        }
    }

#if UNITY_EDITOR
    public string GetFullDirectory(string directory)
    {
        string fullDirectory = Path.Combine(ResourcesOutPath, directory);
        return fullDirectory;
    }

    public string FindFilePath(string directory, string fileName)
    {
        string[] files = Directory.GetFiles(GetFullDirectory(directory), fileName, SearchOption.AllDirectories);
        if (files.Length > 0)
        {
            return files[0];
        }
        return string.Empty;
    }

    public string GetRelativePath(string absolutePath)
    {
        string relativePath = absolutePath.Replace(ResourcesOutPath, "Assets/ResourcesOut/");
        return relativePath;
    }
#endif

    //  // needExt 是否需要函数内部添加后缀
    // [System.Obsolete("US2: Use LoadAssetAsync<T>(directory, name, needExt) returning UniTask<T> instead.")]
    // public T LoadAsset<T>(string directory, string name, bool needExt = true) where T : UnityEngine.Object
    // {
    //     directory = directory.Replace("\\", "/");
    //     name = name.Replace("\\", "/");
    //     //  特殊处理 因为有一层图集的关系 directory要传入的应该是atlas的名字
    //     if (typeof(T) == typeof(Sprite))
    //     {
    //         return LoadSprite(directory, name) as T;
    //     }
    //     else if (typeof(T) == typeof(SkeletonDataAsset))
    //     {
    //         //文件目录调整，name中包含了路径
    //         if (name.Contains("/"))
    //         {
    //             directory += name.Substring(0, name.LastIndexOf("/"));
    //             name = name.Substring(name.LastIndexOf("/") + 1);
    //         }

    //     }

    //     return LoadAssetInternal<T>(directory, name, needExt);
    // }

    // //needExt 是否需要函数内部添加后缀
    // private T LoadAssetInternal<T>(string directory, string name, bool needExt = true) where T : UnityEngine.Object
    // {
    //     // 已禁用同步加载，强制业务全部走异步API。
    //     throw new NotSupportedException("同步资源加载已禁用，请使用异步接口");
    // }

//     [System.Obsolete("US2: Use LoadConfigAsync returning UniTask<string[]> instead.")]
//     public string[] LoadConfig(string name)
//     {
//         string path = string.Empty;
// #if UNITY_EDITOR
//         if (!AssetSource.isUseAssetBundle)
//         {
//             path = ResourcesPath.CONFIG_FODLER + "/" + name + ".txt";
//         }
//         else
// #endif
//         {
//             path = AssetVersionUtility.GetAssetFilePath($"config/{name}.txt");
//         }

//         return File.ReadAllLines(path);
//     }


    public async UniTask<T> LoadAssetAsync<T>(string directory, string name) where T : UnityEngine.Object
    {
        return await LoadAssetAsync<T>(directory, name, needExt: true);
    }

    public async UniTask<T> LoadAssetAsync<T>(string directory, string name, bool needExt = true) where T : UnityEngine.Object
    {
        return await LoadAssetAsync<T>(directory, name, needExt, CancellationToken.None);
    }

    private void LoadSpriteAsync<T>(string atlasName, string spriteName, Action<bool, UnityEngine.Object> callBack) where T : UnityEngine.Object
    {
        if (!AssetSource.isUseAssetBundle)
        {
            // Editor 模式下可直接加载 sprite
            LoadAssetAsyncInternal<T>(atlasName, spriteName, callBack);
        }
        else
        {
            // AB 模式下直接加载单独的 Sprite 文件（YooAsset 自动处理 SpriteAtlas 依赖）
            LoadAssetAsyncInternal<Sprite>(atlasName, spriteName, (isLoaded, sprite) =>
            {
                callBack?.Invoke(isLoaded, sprite);
            });
        }
    }

    private void LoadAssetAsyncInternal<T>(string directory, string name, Action<bool, UnityEngine.Object> callBack, bool needExt = true) where T : UnityEngine.Object
    {
        var path = string.Concat($"Assets/ResourcesOut/{directory}/{name}", (needExt ? GetExtension(typeof(T)) : "")).Replace("//", "/");

        if (!AssetSource.isUseAssetBundle)
        {
#if UNITY_EDITOR
            var asset = UnityEditor.AssetDatabase.LoadAssetAtPath<T>(path);
            callBack?.Invoke(asset != null, asset);
#endif
        }
        else
        {
            // US1: Route through YooAssetService async
            CoLoadViaYooAsset<T>(path, callBack).Forget();
        }
    }

    private async UniTaskVoid CoLoadViaYooAsset<T>(string path, Action<bool, UnityEngine.Object> callBack, CancellationToken ct = default) where T : UnityEngine.Object
    {
        try
        {
            var asset = await YooAssetService.Instance.LoadAssetAsync<T>(path, ct: ct);
            callBack?.Invoke(asset != null, asset);
        }
        catch (Exception ex)
        {
            Debug.LogError($"[ResManager] Async load via YooAsset failed: {ex.Message}");
            callBack?.Invoke(false, null);
        }
    }

    public void UnloadAsset(string directory, string assetName)
    {
        directory = directory.Replace("\\", "/").TrimEnd('/');
        assetName = assetName.Replace("\\", "/");
        string path = ($"Assets/ResourcesOut/{directory}/{assetName}").Replace("//", "/");
        YooAssetService.Instance.UnloadAsset(path);
    }

    public string GetAssetFilePath(string _assetKey)
    {
        var path = Path.Combine(ExternalStorePath, _assetKey);
        if (!File.Exists(path))
        {
            path = Path.Combine(StreamingAssetPath, _assetKey);
        }

        return path;
    }

    // ====================================================================
    // US1: New UniTask-based async variants
    // ====================================================================

    /// <summary>
    /// 异步加载资源（UniTask 版本，US1 新增）。
    /// </summary>
    public async UniTask<T> LoadAssetAsync<T>(string directory, string name, bool needExt = true, CancellationToken ct = default) where T : UnityEngine.Object
    {
        directory = directory.Replace("\\", "/");
        name = name.Replace("\\", "/");

        if (typeof(T) == typeof(Sprite))
        {
            return await LoadSpriteAsyncUniTask(directory, name, ct) as T;
        }

        if (typeof(T) == typeof(SkeletonDataAsset))
        {
            if (name.Contains("/"))
            {
                directory += name.Substring(0, name.LastIndexOf("/"));
                name = name.Substring(name.LastIndexOf("/") + 1);
            }
        }

        var path = ($"Assets/ResourcesOut/{directory}/{name}" + (needExt ? GetExtension(typeof(T)) : ""))
            .Replace("//", "/").Trim().Replace("\\", "/");
        // 音频文件扩展名统一转小写，避免 .WAV/.MP3 大小写不匹配
        if (typeof(T) == typeof(AudioClip))
        {
            var pathExt = System.IO.Path.GetExtension(path);
            if (!string.IsNullOrEmpty(pathExt) && pathExt != pathExt.ToLower())
                path = path.Substring(0, path.Length - pathExt.Length) + pathExt.ToLower();
        }
        if (!AssetSource.isUseAssetBundle)
        {
#if UNITY_EDITOR
            return UnityEditor.AssetDatabase.LoadAssetAtPath<T>(path);
#else
            return null;
#endif
        }

        return await YooAssetService.Instance.LoadAssetAsync<T>(path, ct: ct);
    }

    /// <summary>
    /// US4: 异步加载资源并走缓存层（缓存命中直接返回，未命中则加载并缓存）。
    /// </summary>
    public async UniTask<T> LoadAssetCachedAsync<T>(string directory, string name, bool needExt = true, CancellationToken ct = default) where T : UnityEngine.Object
    {
        directory = directory.Replace("\\", "/");
        name = name.Replace("\\", "/");

        var path = ($"Assets/ResourcesOut/{directory}/{name}" + (needExt ? GetExtension(typeof(T)) : ""))
            .Replace("//", "/").Trim().Replace("\\", "/");
        // 音频文件扩展名统一转小写，避免 .WAV/.MP3 大小写不匹配
        if (typeof(T) == typeof(AudioClip))
        {
            var pathExt2 = System.IO.Path.GetExtension(path);
            if (!string.IsNullOrEmpty(pathExt2) && pathExt2 != pathExt2.ToLower())
                path = path.Substring(0, path.Length - pathExt2.Length) + pathExt2.ToLower();
        }
        if (!AssetSource.isUseAssetBundle)
        {
#if UNITY_EDITOR
            return UnityEditor.AssetDatabase.LoadAssetAtPath<T>(path);
#else
            return null;
#endif
        }

        return await ResourceCacheManager.Instance.GetOrLoadAsync<T>(path);
    }

    private async UniTask<Sprite> LoadSpriteAsyncUniTask(string atlasName, string spriteName, CancellationToken ct = default)
    {
        if (!AssetSource.isUseAssetBundle)
        {
            var atlas = await LoadAssetAsync<SpriteAtlas>("Sprite", atlasName.Replace("Sprite/", ""), ct: ct);
            return atlas?.GetSprite(spriteName);
        }
        else
        {
            var path = $"Assets/ResourcesOut/{atlasName}/{spriteName}.png"
                .Replace("//", "/").Trim().Replace("\\", "/");
            var sprite = await YooAssetService.Instance.LoadAssetAsync<Sprite>(path, ct: ct);
#if UNITY_WEBGL
            if (sprite == null)
                Debug.LogWarning($"[ResManager][WebGL-Diag] Sprite load returned NULL: path={path}");
#endif
            return sprite;
        }
    }

    /// <summary>
    /// 异步加载配置文件（UniTask 版本）。
    /// AB 模式使用 YooAsset RawFile 异步加载，非 AB 模式直接读文件。
    /// </summary>
    public async UniTask<string[]> LoadConfigAsync(string name, bool needExt = true, CancellationToken ct = default)
    {
        // AB 模式（含 WebGL）: 使用 YooAsset 加载配置文件
        if (AssetSource.isUseAssetBundle)
        {
            // 判断一下是否原来已经包含.txt 配合 needExt 做兼容，避免调用方传入重复后缀导致路径错误
            if (name.EndsWith(".txt") && needExt)
            {
                name = name.Substring(0, name.Length - 4);
            }
            var location = $"Assets/ResourcesOut/Config/{name}" + (needExt ? ".txt" : "");
            try
            {
#if UNITY_WEBGL
                // WebGL: WebServerFileSystem 不支持 LoadRawFileAsync，改用 LoadAssetAsync<TextAsset>
                // .txt 文件在 Unity 中以 TextAsset 形式导入，WebGL 支持此加载方式
                var asset = await ProjSG.Resource.YooAssetService.Instance.LoadAssetAsync(
                    location, typeof(UnityEngine.TextAsset), 0, ct) as UnityEngine.TextAsset;
                if (asset != null && !string.IsNullOrEmpty(asset.text))
                    return asset.text.Split(new[] { "\r\n", "\n" }, System.StringSplitOptions.None);
#else
                var textAsset = await ProjSG.Resource.YooAssetService.Instance.LoadAssetAsync<TextAsset>(location, 0, ct);
                if (textAsset != null && !string.IsNullOrEmpty(textAsset.text))
                    return textAsset.text.Split(new[] { "\r\n", "\n" }, System.StringSplitOptions.None);
#endif
            }
            catch (System.Exception ex)
            {
                UnityEngine.Debug.LogError($"[ResManager] LoadConfigAsync YooAsset failed for '{name}': {ex.Message}");
            }
            return System.Array.Empty<string>();
        }

        // 非 AB 模式: 直接读文件（Editor 开发模式）
#if UNITY_EDITOR
        string path = ResourcesPath.CONFIG_FODLER + "/" + name + (needExt ? ".txt" : "");
        return await UniTask.RunOnThreadPool(() => File.ReadAllLines(path));
#else
        return System.Array.Empty<string>();
#endif
    }

}