using System;
using System.Linq;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using AibisDream.Utility;
using UnityEditor.U2D.PSD;


#if UNITY_EDITOR
using UnityEditor;
#endif

namespace AibisDream.Framework
{
    public static class ResourceKit
    {
        public static string SaveSprite(Sprite sprite)
        {
#if UNITY_EDITOR
            if (!sprite) return "";

            // 先读Psd的路径
            string psdPath = AssetDatabase.GetAssetPath(sprite);
            var psdResPath = GetResourcePath(psdPath);
            // 去后缀
            // 找到最后一个点的位置
            int lastDotIndex = psdResPath.LastIndexOf('.');
            // 如果没有点，说明没有扩展名
            if (lastDotIndex == -1)
            {
                return psdResPath;
            }

            // 提取文件名（不包括扩展名）
            var purePath = psdResPath.Substring(0, lastDotIndex);

            // 添加后缀
            return purePath + "/" + sprite.name;
#else
            return null;
#endif
        }

        private static string GetResourcePath(string absolutePath)
        {
            const string resourcesFolderName = "Resources/";
            var index = absolutePath.IndexOf(resourcesFolderName, StringComparison.Ordinal);

            return index >= 0 ? absolutePath[(index + resourcesFolderName.Length)..] : absolutePath;
        }

        public static Sprite LoadSpriteFromPsd(string path)
        {
            int lastIndex = path.LastIndexOf('/');
            string spriteName = path[(lastIndex + 1)..];
            string resPath = path[..lastIndex];

            // 加载
            var sprites = Resources.LoadAll<Sprite>(resPath);

            return sprites.FirstOrDefault(sprite => sprite.name == spriteName);
        }

        public static T LoadAssetSync<T>(string key) where T : UnityEngine.Object
        {
            var operation = Addressables.LoadAssetAsync<T>(key);

            operation.WaitForCompletion();

            if (operation.Status == AsyncOperationStatus.Succeeded)
            {
                return operation.Result;
            }
            else
            {
                Debug.Log($"资源{key}不存在");
                return default;
            }
        }

        public static void LoadAssetAsync<T>(string key, Action<T> callback) where T : UnityEngine.Object
        {
            Addressables.LoadAssetAsync<T>(key).Completed += operation =>
            {
                if (operation.Status == AsyncOperationStatus.Succeeded)
                {
                    callback(operation.Result);
                }
                else
                {
                    Debug.Log($"资源{key}不存在");
                }
            };
        }

        /// <summary>
        /// 异步加载 Addressable 资源，callback 接收完整 handle。调用方需在适当时机调用 Release 释放。
        /// </summary>
        public static void LoadAssetAsyncWithHandle<T>(string key, Action<AsyncOperationHandle<T>> callback) where T : UnityEngine.Object
        {
            var handle = Addressables.LoadAssetAsync<T>(key);
            handle.Completed += operation =>
            {
                if (operation.Status != AsyncOperationStatus.Succeeded)
                {
                    Debug.Log($"资源{key}不存在");
                }
                callback(operation);
            };
        }

        /// <summary>
        /// 释放 Addressable 加载的 handle
        /// </summary>
        public static void Release<T>(AsyncOperationHandle<T> handle)
        {
            if (handle.IsValid())
                Addressables.Release(handle);
        }

#if UNITY_EDITOR
        public static bool GetAssetAddressableKey<T>(T asset, out string addressableKey) where T : UnityEngine.Object
        {
            string path = AssetDatabase.GetAssetPath(asset);

            // 如果是Sprite，并且是Multiple模式，则单独处理
            if (asset is Sprite sprite && AssetImporter.GetAtPath(path) is TextureImporter importer)
            {
                if (importer.textureType == TextureImporterType.Sprite && importer.spriteImportMode == SpriteImportMode.Multiple)
                {
                    if (TryGetAddressableKey(path, out var addressableKeyPrefix))
                    {
                        addressableKey = $"{addressableKeyPrefix}[{sprite.name}]";
                        return true;
                    }
                    else
                    {
                        addressableKey = addressableKeyPrefix;
                        return false;
                    }
                }
            }
            else if (asset is Sprite texture && AssetImporter.GetAtPath(path) is PSDImporter psdImporter)
            {
                if (TryGetAddressableKey(path, out var addressableKeyPrefix))
                {
                    addressableKey = $"{addressableKeyPrefix}[{texture.name}]";
                    return true;
                }
                else
                {
                    addressableKey = addressableKeyPrefix;
                    return false;
                }
            }
            // 其他情况正常输出
            return TryGetAddressableKey(path, out addressableKey);
        }
        
        private static bool TryGetAddressableKey(string path, out string addressableKey)
        {
            // 获取其在Addressables里的路径
            var settings = UnityEditor.AddressableAssets.AddressableAssetSettingsDefaultObject.Settings;
            if (settings != null)
            {
                var entry = settings.FindAssetEntry(AssetDatabase.AssetPathToGUID(path));
                if (entry != null)
                {
                    addressableKey = entry.address;
                    return true;
                }
            }
            Debug.Log($"资源{path}不存在于Addressables中");
            addressableKey = path;
            return false;
        }
#endif
    }
}