using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.Networking;
namespace Kill.Base
{
    public class NetworkCtrl : MonoBehaviour
    {

        public static NetworkCtrl Instance;

        public string localPath;
        public string streamingPath;


        void Awake()
        {
            Instance = this;
            localPath = Application.persistentDataPath;
            streamingPath = Application.streamingAssetsPath;
        }
        async Task Start()
        {
            nowResourceUrl = resourceUrls[nowResourceIndex];
#if UNITY_EDITOR_WIN
            platform = "Windows";
#elif UNITY_EDITOR_OSX
            platform = "Mac";
#elif UNITY_ANDROID
            platform = "Android";
#elif UNITY_IOS
            platform = "iOS";
#endif
            await Init();
        }
        public async Task Init()
        {
            Debug.Log("初始化网络控制");
            AndroidStatusBar.statusBarState = AndroidStatusBar.States.TranslucentOverContent;
            // 检查并清理过期资源
            CheckAndCleanOutdatedResources();
            if (LoadRes.Instance.resPosition == LoadRes.ResPosition.资源包)
            {
                await GetNowBundleList();
                if (nowResVersion < new Version(resourceVersion))
                {
                    Debug.Log("111");
                    await GetBundleList();
                    await UpdateResources();
                }
            }
            // await FireBaseCtrl.Instance.Init();
            await LoadRes.Instance.Init();
            UI.UIManager.Instance.Init();
           
        }
        #region 资源更新
        public string[] resourceUrls;
        public int nowResourceIndex;
        string nowResourceUrl;
        public string resourceVersion;
        string platform;
        Version nowResVersion = new Version("0.0.0");
        public AssetBundleInfoList nowBundleList;
        public AssetBundleInfoList newBundleList;
        public async Task GetNowBundleList()
        {
            string localListPath = localPath + "/list.json";
            string streamingListPath = streamingPath + "/list.json";

            // 首先尝试从持久化路径读取
            if (File.Exists(localListPath))
            {
                nowBundleList = JsonUtility.FromJson<AssetBundleInfoList>(File.ReadAllText(localListPath));
                Debug.Log("===获取本地资源列表成功");
            }
            // 如果本地没有，则从 StreamingAssets 读取
            else
            {
                string listJson = await ReadTextFileFromStreamingAssets(streamingListPath);
                if (!string.IsNullOrEmpty(listJson))
                {
                    nowBundleList = JsonUtility.FromJson<AssetBundleInfoList>(listJson);
                    Debug.Log("===获取更包资源列表成功");
                }
                else
                {
                    Debug.Log("===没有获取资源列表");
                    nowBundleList = null;
                }
            }
            if (nowBundleList != null)
            {
                nowResVersion = new Version(nowBundleList.version);
            }
        }
        /// <summary>
        /// 检查并清理过期的本地资源
        /// 通过比较版本号判断是否需要清理
        /// </summary>
        public async void CheckAndCleanOutdatedResources()
        {
            try
            {
                // 获取StreamingAssets中的资源列表
                string streamingListPath = Path.Combine(streamingPath, "list.json");
                string streamingListJson = await ReadTextFileFromStreamingAssets(streamingListPath);

                if (string.IsNullOrEmpty(streamingListJson))
                {
                    return;
                }

                AssetBundleInfoList streamingBundleList = JsonUtility.FromJson<AssetBundleInfoList>(streamingListJson);

                // 获取本地资源列表
                string localListPath = Path.Combine(localPath, "list.json");
                if (!File.Exists(localListPath))
                {
                    // 本地没有资源列表，不需要清理
                    return;
                }

                string localListJson = File.ReadAllText(localListPath);
                AssetBundleInfoList localBundleList = JsonUtility.FromJson<AssetBundleInfoList>(localListJson);

                // 比较版本号
                if (new Version(streamingBundleList.version) >= new Version(localBundleList.version))
                {
                    Debug.Log($"检测到资源版本更新: {localBundleList.version} -> {streamingBundleList.version}，正在清理本地过期资源...");

                    // 版本不一致，清理本地所有.ab文件
                    CleanLocalAssetBundleFiles();
                }
                else
                {
                    Debug.Log($"本地资源版本({localBundleList.version})更新，无需清理");
                }
            }
            catch (Exception ex)
            {
                Debug.LogError($"检查资源版本时出错: {ex.Message}");
            }
        }

        /// <summary>
        /// 清理本地的所有AssetBundle文件
        /// </summary>
        private void CleanLocalAssetBundleFiles()
        {
            try
            {
                // 删除本地所有的.ab文件
                string[] localAbFiles = Directory.GetFiles(localPath, "*.ab", SearchOption.AllDirectories);
                foreach (string abFile in localAbFiles)
                {
                    try
                    {
                        File.Delete(abFile);
                        Debug.Log($"已删除过期资源文件: {abFile}");
                    }
                    catch (Exception ex)
                    {
                        Debug.LogError($"删除文件失败 {abFile}: {ex.Message}");
                    }
                }

                File.Delete(localPath + "/list.json");
                Debug.Log("本地过期资源清理完成");
            }
            catch (Exception ex)
            {
                Debug.LogError($"清理本地资源时出错: {ex.Message}");
            }
        }
        public async Task GetBundleList()
        {
            string url = nowResourceUrl + $"{resourceVersion}/{platform}/list.json";
            using (UnityWebRequest webRequest = UnityWebRequest.Get(url))
            {
                var operation = webRequest.SendWebRequest();
                while (!operation.isDone)
                {
                    await Task.Yield();
                }
                if (webRequest.result == UnityWebRequest.Result.Success)
                {
                    AssetBundleInfoList list = JsonUtility.FromJson<AssetBundleInfoList>(webRequest.downloadHandler.text);
                    newBundleList = list;
                }
                else
                {
                    Debug.LogError(url + "获取资源列表失败" + webRequest.error);
                    // ErrorTip.Instance.Init("获取资源列表失败", url, async (msg) =>
                    // {
                    //     await GetBundleList();
                    // });

                }
            }
        }
        /// <summary>
        /// 从StreamingAssets目录读取文本文件（兼容各平台）
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>文件内容</returns>
        private async Task<string> ReadTextFileFromStreamingAssets(string filePath)
        {
            string result = null;

#if UNITY_ANDROID && !UNITY_EDITOR
    // Android平台特殊处理
    UnityWebRequest www = UnityWebRequest.Get(filePath);
    var operation = www.SendWebRequest();
    
    // 等待请求完成
    while (!operation.isDone)
    {
        await Task.Yield();
    }
    
    if (www.result == UnityWebRequest.Result.Success)
    {
        result = www.downloadHandler.text;
    }
    else
    {
        Debug.LogError($"读取StreamingAssets文件失败: {www.error}");
    }
    
    www.Dispose();
#else
            // 其他平台可以直接访问文件系统
            if (File.Exists(filePath))
            {
                result = File.ReadAllText(filePath);
            }
#endif

            return result;
        }
        public async Task UpdateResources()
        {
            // 获取更新列表
            List<AssetBundleInfo> updateList = GetUpdateList();

            if (updateList.Count > 0)
            {
                // 开始下载更新
                bool success = await DownloadUpdateFiles(updateList, (downloaded, total) =>
                {
                    float progress = (float)downloaded / total;
                    Debug.Log($"更新进度: {progress:P}");
                });

                if (success)
                {
                    Debug.Log("资源更新完成");
                }
                else
                {
                    Debug.LogError("资源更新失败");
                }
            }
            else
            {
                Debug.Log("资源已是最新版本");
            }
        }
        /// <summary>
        /// 对比当前资源列表和新资源列表，找出需要更新的文件
        /// </summary>
        /// <returns>需要更新的资源信息列表</returns>
        public List<AssetBundleInfo> GetUpdateList()
        {
            List<AssetBundleInfo> updateList = new List<AssetBundleInfo>();

            // 如果没有当前列表，则全部都需要下载
            if (nowBundleList == null || nowBundleList.assetbundles == null)
            {
                return newBundleList.assetbundles ?? new List<AssetBundleInfo>();
            }

            // 创建当前资源字典以便快速查找
            Dictionary<string, AssetBundleInfo> nowBundleDict = new Dictionary<string, AssetBundleInfo>();
            foreach (var bundle in nowBundleList.assetbundles)
            {
                nowBundleDict[bundle.name] = bundle;
            }

            // 对比新资源列表
            foreach (var newBundle in newBundleList.assetbundles)
            {
                // 检查文件是否存在或MD5是否不匹配
                if (!nowBundleDict.ContainsKey(newBundle.name) ||
                    nowBundleDict[newBundle.name].md5 != newBundle.md5)
                {
                    updateList.Add(newBundle);
                }
            }

            return updateList;
        }

        /// <summary>
        /// 计算需要更新的总大小
        /// </summary>
        /// <param name="updateList">需要更新的资源列表</param>
        /// <returns>总大小(字节)</returns>
        public long CalculateUpdateSize(List<AssetBundleInfo> updateList)
        {
            long totalSize = 0;
            foreach (var bundle in updateList)
            {
                totalSize += bundle.size;
            }
            return totalSize;
        }

        /// <summary>
        /// 下载更新文件并实时返回进度
        /// </summary>
        /// <param name="updateList">需要更新的资源列表</param>
        /// <param name="progressCallback">进度回调(已下载字节数, 总字节数)</param>
        /// <returns>是否下载成功</returns>
        public async Task<bool> DownloadUpdateFiles(List<AssetBundleInfo> updateList, Action<long, long> progressCallback)
        {
            long totalSize = CalculateUpdateSize(updateList);
            long downloadedSize = 0;

            // 初始化 nowBundleList（如果为空）
            if (nowBundleList == null || nowBundleList.assetbundles == null)
            {
                nowBundleList = new AssetBundleInfoList(new List<AssetBundleInfo>());
            }

            // 创建当前资源字典以便快速查找和更新
            Dictionary<string, AssetBundleInfo> nowBundleDict = new Dictionary<string, AssetBundleInfo>();
            foreach (var bundle in nowBundleList.assetbundles)
            {
                nowBundleDict[bundle.name] = bundle;
            }

            foreach (var bundle in updateList)
            {
                string url = nowResourceUrl + $"{resourceVersion}/{platform}/{bundle.name}";
                string savePath = Path.Combine(localPath, bundle.name);

                // 确保目录存在
                string directory = Path.GetDirectoryName(savePath);
                if (!Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }

                bool downloadSuccess = await DownloadSingleFile(url, savePath, bundle.md5);
                if (!downloadSuccess)
                {
                    Debug.LogError($"下载文件失败: {bundle.name}");
                    return false;
                }

                // 下载成功后，更新 nowBundleList
                nowBundleDict[bundle.name] = bundle;
                downloadedSize += bundle.size;
                progressCallback?.Invoke(downloadedSize, totalSize);

                // 简短延迟避免请求过于频繁
                await Task.Yield();
            }

            // 更新完整的 nowBundleList
            nowBundleList.assetbundles = new List<AssetBundleInfo>(nowBundleDict.Values);
            nowBundleList.version = resourceVersion;
            // 下载完成后保存新的list.json
            SaveNewBundleList();

            return true;
        }


        /// <summary>
        /// 下载单个文件并校验MD5
        /// </summary>
        /// <param name="url">文件URL</param>
        /// <param name="savePath">保存路径</param>
        /// <param name="expectedMd5">期望的MD5值</param>
        /// <returns>是否下载并校验成功</returns>
        private async Task<bool> DownloadSingleFile(string url, string savePath, string expectedMd5)
        {
            int maxRetries = 2;
            for (int i = 0; i <= maxRetries; i++)
            {
                using (UnityWebRequest webRequest = UnityWebRequest.Get(url))
                {
                    var operation = webRequest.SendWebRequest();
                    while (!operation.isDone)
                    {
                        await Task.Yield();
                    }

                    if (webRequest.result == UnityWebRequest.Result.Success)
                    {
                        // 保存文件
                        File.WriteAllBytes(savePath, webRequest.downloadHandler.data);

                        // 校验MD5
                        string actualMd5 = CalculateMD5(savePath);
                        if (actualMd5.ToLower() == expectedMd5.ToLower())
                        {
                            return true;
                        }
                        else
                        {
                            Debug.LogError($"MD5校验失败 {url}: 期望 {expectedMd5}, 实际 {actualMd5}");
                            // MD5校验失败时删除文件
                            if (File.Exists(savePath))
                            {
                                File.Delete(savePath);
                            }
                        }
                    }
                    else
                    {
                        Debug.LogError($"下载失败 {url}: {webRequest.error} (尝试 {i + 1}/{maxRetries + 1})");
                    }

                    // 如果还没达到最大重试次数，等待一段时间后重试
                    if (i < maxRetries)
                    {
                        await Task.Delay(1000 * (i + 1)); // 递增延迟时间
                    }
                }
            }

            // 所有重试都失败后显示错误提示
            ErrorTip.Instance.Init("下载资源包失败", url, async (msg) =>
            {
                // 错误处理回调 - 重新尝试下载更新资源流程
                Debug.Log("用户选择重试下载资源包");
                await UpdateResources();
            });

            return false;
        }

        /// <summary>
        /// 计算文件的MD5值
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>MD5值</returns>
        private string CalculateMD5(string filePath)
        {
            using (var md5 = System.Security.Cryptography.MD5.Create())
            {
                using (var stream = File.OpenRead(filePath))
                {
                    byte[] hash = md5.ComputeHash(stream);
                    return BitConverter.ToString(hash).Replace("-", "").ToLower();
                }
            }
        }

        /// <summary>
        /// 保存新的资源列表到本地
        /// </summary>
        public void SaveNewBundleList()
        {
            if (newBundleList != null)
            {
                string json = JsonUtility.ToJson(newBundleList, true);
                string savePath = Path.Combine(localPath, "list.json");
                File.WriteAllText(savePath, json);
                Debug.Log("新的资源列表已保存到本地");
            }
        }
        #endregion
        #region 通用网络请求

        #endregion
    }



}