using System;
using FairyGUI;
using System.Collections.Generic;
using UnityEngine;
using YooAsset;
using System.Threading.Tasks;

namespace GFGGame
{
    public class GFGUIPackage
    {
        private static Dictionary<string, UIPackage> _packages = new Dictionary<string, UIPackage>();

        private static Dictionary<string, List<AssetOperationHandle>> assetHandleCacheDic =
            new Dictionary<string, List<AssetOperationHandle>>();

        private static Dictionary<string, int> _assetCount = new Dictionary<string, int>();

        // public static void AddPackage(string descFilePath)
        // {
        //     _assetCount.TryGetValue(descFilePath, out var count);
        //     if (count > 0)
        //     {
        //         _assetCount[descFilePath] = count + 1;
        //         return;
        //     }
        //     _assetCount.Add(descFilePath, count + 1);
        //     var handle = YooAssets.LoadAssetSync<TextAsset>($"{descFilePath}_fui.bytes");
        //     TextAsset textAsset = handle.AssetObject as TextAsset;
        //     CacheAssetHandle(descFilePath, handle);
        //     //同步
        //     var uiPackage = UIPackage.AddPackage(textAsset.bytes, descFilePath, (string name, string extension, System.Type type, out DestroyMethod destroyMethod) =>
        //     {
        //         string location = name + extension;
        //         destroyMethod = DestroyMethod.None; //注意：这里一定要设置为None
        //         if (!YooAssets.CheckResExist(location))
        //         {
        //             return null;
        //         }
        //         var handle = YooAssets.LoadAssetSync(location, type);
        //         CacheAssetHandle(descFilePath, handle);
        //         return handle.AssetObject;
        //     });
        //     _packages.Add(descFilePath, uiPackage);
        // }

        public static void AddPackage(string descFilePath, Action onComplete = null, Action<string> onError = null)
        {
            // 打印开始加载信息
            _assetCount.TryGetValue(descFilePath, out var count);
            if (count > 0)
            {
                _assetCount[descFilePath] = count + 1;
                Debug.Log($"{descFilePath} 已引用，引用计数+1 (当前: {count + 1})");
                onComplete?.Invoke();
                return;
            }

            _assetCount.Add(descFilePath, count + 1);

            // 加载主资源
            var handle = YooAssets.LoadAssetAsync<TextAsset>($"{descFilePath}_fui.bytes");

            handle.Completed += (mainHandle) =>
            {
                if (mainHandle.Status != EOperationStatus.Succeed)
                {
                    string error = $"描述文件加载失败: {descFilePath}_fui.bytes, 错误: {mainHandle.LastError}";
                    Debug.LogError(error);
                    onError?.Invoke(error);
                    return;
                }
                
                TextAsset textAsset = mainHandle.AssetObject as TextAsset;
                CacheAssetHandle(descFilePath, mainHandle);

                // 添加UI包
                var uiPackage = UIPackage.AddPackage(textAsset.bytes, descFilePath,
                    (string name, string extension, System.Type type, PackageItem item) =>
                    {
                        string location = name + extension;

                        if (!YooAssets.CheckResExist(location))
                        {
                            Debug.LogWarning($"依赖资源不存在: {location}");
                            return;
                        }

                        AssetOperationHandle depHandle = YooAssets.LoadAssetAsync(location, type);
                        CacheAssetHandle(descFilePath, depHandle);
                        depHandle.Completed += (depHandle) =>
                        {
                            if (depHandle.Status != EOperationStatus.Succeed)
                            {
                                Debug.LogError($"依赖资源加载失败: {location}");
                                return;
                            }

                            if (depHandle.AssetObject == null)
                            {
                                Debug.LogWarning($"依赖资源为空: {location}");
                                return;
                            }
                            
                            Texture tex = depHandle.AssetObject as Texture;
                            if (tex != null)
                            {
                                string alphaLocation = name + "!a" + extension;

                                if (YooAssets.CheckResExist(alphaLocation))
                                {
                                    AssetOperationHandle alphaHandle = YooAssets.LoadAssetAsync(alphaLocation, type);
                                    CacheAssetHandle(descFilePath, alphaHandle);
                                    alphaHandle.Completed += (alphaHandle) =>
                                    {
                                        if (alphaHandle.Status != EOperationStatus.Succeed)
                                        {
                                            Debug.LogError($"透明通道资源加载失败: {alphaLocation}");
                                            return;
                                        }

                                        if (alphaHandle.AssetObject == null)
                                        {
                                            Debug.LogWarning($"透明通道资源为空: {alphaLocation}");
                                            return;
                                        }
                                        
                                        Texture alphaTex = alphaHandle.AssetObject as Texture;
                                        item.owner.SetItemAsset(item, tex, alphaTex, DestroyMethod.None);
                                    };
                                    return;
                                }
                            }

                            item.owner.SetItemAsset(item, depHandle.AssetObject, null, DestroyMethod.None);
                        };
                    });

                _packages.Add(descFilePath, uiPackage);
                CheckRemovePackage(descFilePath);
                onComplete?.Invoke();
            };
        }
        
        public static void ReleasePackage(string descFilePath)
        {
            _assetCount.TryGetValue(descFilePath, out var count);
            if (count > 0)
            {
                count--;
                _assetCount[descFilePath] = count;
                CheckRemovePackage(descFilePath);
            }
        }

        private static void CheckRemovePackage(string descFilePath)
        {
            _assetCount.TryGetValue(descFilePath, out var count);
            if (count > 0) return;
            _packages.TryGetValue(descFilePath, out var package);
            if (package == null) return;
            _assetCount.Remove(descFilePath);
            _packages.Remove(descFilePath);
            UIPackage.RemovePackage(package.name);

            if (assetHandleCacheDic.TryGetValue(descFilePath, out var list))
            {
                foreach (var asset in list)
                {
                    asset.Release();
                }

                list.Clear();
            }
        }

        private static void CacheAssetHandle(string key, AssetOperationHandle handle)
        {
            List<AssetOperationHandle> list = null;
            if (!assetHandleCacheDic.TryGetValue(key, out list))
            {
                list = new List<AssetOperationHandle>();
                assetHandleCacheDic.Add(key, list);
            }

            list.Add(handle);
        }
    }
}