using Game.Config;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using UnityEngine;
using UnityEngine.Networking;


class LocalFilePathInfo
{
    public string Path;
    /// <summary>
    /// 是否可读可写文件夹
    /// </summary>
    public bool IsLocalRW;


    public LocalFilePathInfo()
    {
        Path = "";
        IsLocalRW = false;
    }

    public LocalFilePathInfo(string path,bool rw)
    {
        Path = path;
        IsLocalRW = rw;
    }

}

public class DownloadMgr : Singleton<DownloadMgr>
{
    public const int TimeOut = 60;



    private string downloadBaseUrl;

    private string downloadUrl;
    public string DownloadUrl { get => downloadUrl; }


    private int downloadTaskMaxNum;
    public int DownloadTaskMaxNum { get => downloadTaskMaxNum; }

    private string localFilePath;
    public string LocalFilePath { get => localFilePath; }

    private List<DownloadDataEntity> needDownloadList;
    private Dictionary<DownloadDataEntity,ulong> downloadingList;
    private List<DownloadDataEntity> downloadSucessList;
    private List<DownloadDataEntity> remoteResList;
    private Dictionary<string, DownloadDataEntity> localResMap;
    private Dictionary<string, DownloadDataEntity> remoteResMap;

    private bool isInited = false;

    private GameDataFormatInfo downloadFormatInfo;

    private string versionFileName;
    private string assetsFileName;
    private string downloadedAssetsFileName;


    private ulong downloadSize;
    private ulong downloadingSize;

    public ulong DownloadSize { get => downloadSize + GetDownloadingSize(); }
    private ulong totalSize;//总大小
    public ulong TotalSize { get => totalSize; }
    public bool CheckFinish { get;private set; }

    public bool DowmloadError { get; private set; }

    //private byte[] versionData;
    //private byte[] mainfestData;
    private string versionData;
    //private UnityWebRequest mainfestData;

    private int tryGetVersionCount;
    public bool isQiangDownload;

    public string ResVersion { get; private set; }
    public override void Init()
    {
        InitField();
    }

    private ulong GetDownloadingSize()
    {
        downloadingSize = 0;
        foreach (var item in downloadingList)
        {
            downloadingSize += item.Value;
        }
        return downloadingSize;
    }
    private string GetIOSDownloadPath()
    {
       return "res/IosRes/";
//#if GAME_DEBUG
//#else
//#endif
    }

    private string GetAndroidDownloadPath()
    {
#if GAME_ONE 
        return "res/WDAndroidRes/";
#elif GAME_DEBUG
        return "res/TestServerRes/";
#else
        return "res/WDAndroidRes/";
#endif
    }

    private string GetDownloadBaseUrl()
    {
#if GAME_ONE
        return "http://101.43.46.101:88/";
#elif CN_I7GAME_ZHUAN
          return "http://43.248.186.74:88/";
#elif CN_I7GAME_0_1
         return "http://103.239.245.64:88/"; // "http://weix.vvfyj.cn/";//
#elif GAME_DEBUG
         return "http://110.40.223.119:88/";
#else

#if UNITY_EDITOR
        return "http://43.248.187.68:88/";
#else
        return  "http://cdn.yishanyou.com:88/";
#endif

#endif
    }

    private string GetBaseUrl()
    {
#if GAME_ONE
        return "";//"http://101.43.46.101:81/";
#elif CN_I7GAME_ZHUAN
          return "http://43.248.186.74:81/";
#elif CN_I7GAME_0_1
        return "http://103.239.245.64:81/";
#elif GAME_DEBUG
         return "";//"http://110.40.223.119:81/";
#else

#if UNITY_EDITOR
        return "";//"http://43.248.187.68:81/";
#else
        return  ""//"http://cdn.yishanyou.com:81/";
#endif

#endif
    }

    private string GetDownloadUrl()
    {
#if UNITY_IOS
        return GetDownloadBaseUrl() + GetIOSDownloadPath();
#else
        return GetDownloadBaseUrl() + GetAndroidDownloadPath();
#endif
    }
    private string GetDownloadUrlFormServer(string baseUrl)
    {
#if UNITY_IOS
        return baseUrl + GetIOSDownloadPath();
#else
        return baseUrl + GetAndroidDownloadPath();
#endif
    }
    private void InitField()
    {
        if (!isInited)
        {
           
            downloadUrl = GetDownloadUrl();


            downloadTaskMaxNum = 5;
            localFilePath = GetLocalResPath();//FileSystem.LocalDocumentPath;


            versionFileName = "Version";
            assetsFileName = "mainfest";
            downloadedAssetsFileName = "downloaded";
            needDownloadList = new List<DownloadDataEntity>(100);
            downloadSucessList = new List<DownloadDataEntity>(100);
            downloadingList = new Dictionary<DownloadDataEntity,ulong>(downloadTaskMaxNum);
            remoteResList = new List<DownloadDataEntity>(1024);
            localResMap = new Dictionary<string, DownloadDataEntity>(1024);
            remoteResMap = new Dictionary<string, DownloadDataEntity>(1024);
            isInited = true;
            CheckFinish = false;
            DowmloadError = false;
            downloadSize = 0;
            downloadingSize = 0;
            totalSize = 0;
            tryGetVersionCount = 0;
            isQiangDownload = true;
            ResVersion = "0.0.0.0";
        }
    }
    //
    private string GetPlatform()
    {
#if UNITY_EDITOR
        return "IOS";// "PC";
#else
#if UNITY_IOS
       return "IOS";//
#else
         return "Android";//
#endif
#endif

    }

    public void CheckVersion()
    {
        string baseUrl = GetBaseUrl();
        if (!string.IsNullOrEmpty(baseUrl) && tryGetVersionCount <= 3)
        {
            baseUrl += $"serverlist/download?platform={GetPlatform()}";
            AssetDownloader.Instance.DownLoadFileByCoroutine(baseUrl,webReq=> 
            {
                if (webReq == null)
                {
                    CheckFinish = true;
                    DowmloadError = true;
                    return;
                }
                
                string url = webReq.downloadHandler.text;
                url = url.Substring(1, url.Length - 2);
                if (url.IndexOf("http://") < 0)
                {
                    url = "http://"+ url;
                }

                Debug.Log("请求得到：" + url);
                downloadUrl = GetDownloadUrlFormServer(url + "/");
                StartCheck();
            });
        }
        else
        {
            downloadUrl = GetDownloadUrl();
            StartCheck();
        }
       
       
    }


    private void StartCheck()
    {
        ReadDataFromFile(versionFileName, lVdatas =>
        {
            if (lVdatas!=  null)
            {
                ResVersion = Encoding.UTF8.GetString(lVdatas);
            }

            AssetDownloader.Instance.DownLoadFileByCoroutine(GetRemoteUrl(versionFileName), webRqst =>
            {
                tryGetVersionCount++;
                if (webRqst == null)
                {
                    SetCheckFinishAddDownError();
                    return;
                }
                byte[] data = webRqst.downloadHandler.data;

                string version = Encoding.UTF8.GetString(data);
                Debug.Log("服务器 version = " + version);
                versionData = version;
                OnloadedLocalVersion(lVdatas, version);

            });

        }, true);
        
    }

    public void DownLoadRemoteRes()
    {
        int size = needDownloadList.Count;
        int downsize = downloadSucessList.Count;
        downloadSize = 0;
        totalSize = 0;
        for (int i = 0; i < size; i++)
        {
            if (needDownloadList[i].FullName == "Version")
            {
                needDownloadList[i].State = DownloadTaskState.DownloadSuccess;
                continue;
            }

            totalSize += needDownloadList[i].Size;

            DownloadDataEntity entity = downloadSucessList.FindFirst(it=>it.FullName == needDownloadList[i].FullName);


            if (downsize > 0 && entity != null && entity.MD5 == needDownloadList[i].MD5)
            {
                needDownloadList[i].State = DownloadTaskState.DownloadSuccess;
                downloadSize += needDownloadList[i].Size;
            }
            else
            {
                needDownloadList[i].Callback = DownloadedCallback;
                needDownloadList[i].UpDateCallback = DownloadedUpdateCallback;
                AssetDownloader.Instance.AddDownloadTask(needDownloadList[i]);
            }

        }
    }

    public bool DownLoadFinish()
    {
        bool ret = true;

        int size = needDownloadList.Count;
        for (int i = 0; i < size; i++)
        {
            if (needDownloadList[i].State != DownloadTaskState.DownloadSuccess)
            {
                ret = false;
            }
        }
        return ret || DowmloadError || !AssetDownloader.Instance.HasTask();
    }

    public bool CheckNeedDownload()
    {
        return downloadSize < totalSize;
    }
    private void DownloadedUpdateCallback(DownloadTask task)
    {
        if (task == null)
        {
           // DowmloadError = true;
            //AssetDownloader.Instance.CancelDownLoad = true;
            return;
        }
        Log($"下载：{task.downloadSize}/{task.CurDownloadEntity.Size}    进度：{task.CurLoadProgress*100}%");
        //downloadingSize = task.downloadSize;
        if (!downloadingList.ContainsKey(task.CurDownloadEntity))
        {
            downloadingList.Add(task.CurDownloadEntity, task.downloadSize);
        }
        else
        {
            downloadingList[task.CurDownloadEntity] = task.downloadSize;
        }
    }
    public void Log(string str)
    {
#if UNITY_EDITOR
        Debug.Log(str);
#endif
    }
    private void DownloadedCallback(DownloadTask task)
    {
        if (task == null || task.State == DownloadTaskState.Error)
        {
            //DowmloadError = true;
            //AssetDownloader.Instance.CancelDownLoad = true;
            if (task != null &&task.CurDownloadEntity.DownloadErrCount >= 3)
            {
                task.CurDownloadEntity.Url = GetDownloadUrl() + task.CurDownloadEntity.FullName;

               Log("重新设置Url = " + task.CurDownloadEntity.Url);
            }
            else if (task != null && task.CurDownloadEntity.DownloadErrCount >= 10)
            {
                DowmloadError = true;
            }
            return;
        }

        DownloadDataEntity entity = downloadSucessList.FindFirst(it => it.FullName == task.CurDownloadEntity.FullName);

        if (entity != null)
        {
            entity.MD5 = task.CurDownloadEntity.MD5;
            entity.Size = task.CurDownloadEntity.Size;
        }
        else
        {
            downloadSucessList.Add(task.CurDownloadEntity);
        }
        if (downloadingList.ContainsKey(task.CurDownloadEntity))
        {
            downloadingList.Remove(task.CurDownloadEntity);
        }
        downloadingSize = 0;
        downloadSize += task.downloadSize;

        
        string savepath = localFilePath + downloadedAssetsFileName;

        CsvWriter<DownloadDataEntity> csvWriter = new CsvWriter<DownloadDataEntity>(savepath, "", downloadSucessList, downloadFormatInfo);
        csvWriter.Write();
  
    }

    private List<DownloadDataEntity> SerizlizeResList(byte[] data)
    {
        CsvReader csvReader = new CsvReader(FileHelper.GetName(assetsFileName), data);
        if (downloadFormatInfo == null)
        {
            downloadFormatInfo = new GameDataFormatInfo(csvReader.Fields(), csvReader.Types());
        }
        Type type = typeof(DownloadDataEntity);
        MethodInfo methodInfo = type.GetMethod("OnCsvLoad", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
        methodInfo?.Invoke(null, new object[] { csvReader });
        List<DownloadDataEntity> resList = DownloadDataEntity.AllData();
        DownloadDataEntity.Clear();
        return resList;
    }

    private void GetRemoteResList()
    {
        string remoteversionpath = downloadUrl + assetsFileName;
        AssetDownloader.Instance.DownLoadFileByCoroutine(remoteversionpath, webRqst =>
         {
             if (webRqst == null)
             {
                 SetCheckFinishAddDownError();
                 return;
             }
             byte[] data = webRqst.downloadHandler.data;
             // mainfestData = new byte[data.Length];
             // data.CopyTo(mainfestData,0);
             //mainfestData = webRqst;
             List<DownloadDataEntity> reResList = SerizlizeResList(data);

             
             if (reResList != null)
             {
                 OnRomoteListDownloaded(reResList);
             }
            
         });
    }

    private void OnRomoteListDownloaded(List<DownloadDataEntity> downloadDatas)
    {
        remoteResList.AddRange(downloadDatas);
        int size = downloadDatas.Count;
        for (int i = 0; i < size; i++)
        {
            remoteResMap.Add(downloadDatas[i].FullName, downloadDatas[i]);
        }
//#if UNITY_IOS
//        ReadDataFromFile(assetsFileName, OnloadedLocalResList, false, 1);
//#else
//         ReadDataFromFile(assetsFileName, OnloadedLocalResList);
//#endif
        ReadDataFromFile(assetsFileName, OnloadedLocalResList);
    }
    //uint major
    //uint minor 
    //uint release 
    //uint patch 

    private void SetCheckFinish()
    {
        versionData = null;
        CheckFinish = true;
    }


    private void SetCheckFinishAddDownError()
    {
        if (isQiangDownload  && tryGetVersionCount <= 10)
        {
            CheckVersion();
        }
        else
        {
            CheckFinish = true;
            DowmloadError = true;
        }
    }
    private string GetLocalResPath()
    {
        string localPath = FileSystem.LocalDocumentPath;
//#if UNITY_IOS
//        localPath = "file://" + localPath;
//#endif
        return localPath;
    }

    private string GetStreamResPath()
    {
        string streamPath = FileSystem.LocalPackagePath;
#if UNITY_IOS
        streamPath = "file://" + streamPath;
#endif
        return streamPath;
    }

    private void OnloadedLocalVersion(byte[] datas, string version)
    {
        string lVersionstr = "0.0.0.0";
        if (datas != null)
        {
            lVersionstr = Encoding.UTF8.GetString(datas);
        }
        

        VersionCode lVersionCode = lVersionstr;//本地 local version
        VersionCode RVersionCode = version;// 远端 version

        string streamPath = GetStreamResPath();


        AssetDownloader.Instance.AssetLoadByCorutine(streamPath + versionFileName, filedatas =>
        {
            if (filedatas == null)
            {
                GetRemoteResList();
                Debug.Log("======  SVersionstr 为空 =====");
                return;
            }

            VersionCode SVersionCode;// stream data version
            string SVersionstr = Encoding.UTF8.GetString(filedatas);
            SVersionCode = SVersionstr;

            VersionCode localMaxCode = lVersionCode > SVersionCode ? lVersionCode : SVersionCode;
            ResVersion = localMaxCode;
            if (localMaxCode == RVersionCode)
            {
                Debug.Log($"lVersionstr =  {lVersionstr}  SVersionstr = {SVersionstr}  =====  version = {version}   不需要更新");
                SetCheckFinish();
                return;
            }


            if (localMaxCode >= RVersionCode && SVersionCode == localMaxCode)
            {
                Debug.Log($"lVersionstr =  {lVersionstr}  SVersionstr = {SVersionstr}  =====  version = {version} 不需要跟新 需要删除之前下载资源");
                versionData = null;
                ReadDataFromFile(downloadedAssetsFileName, dlocaldatas =>
                {
                    if (dlocaldatas != null)
                    {
                        List<DownloadDataEntity> localdownloadedList = SerizlizeResList(dlocaldatas);
                        if (localdownloadedList != null && localdownloadedList.Count > 0)
                        {
                            downloadSucessList.AddRange(localdownloadedList);
                        }
                        DeleteDownloadFiles();

                    }
                    else
                    {
                        SetCheckFinish();
                    }
                },true);

            }
            else
            {
                Debug.Log($"lVersionstr =  {lVersionstr}  SVersionstr = {SVersionstr}  =====  version = {version}  需要更新");
                GetRemoteResList();
                //CheckFinish = true;
            }
        });
    }

    private void OnloadedVersion(byte[] datas,string version)
    {
        if (datas == null)
        {
            GetRemoteResList();
            Debug.Log("======  data 为空 =====");
        }
        else
        {
            string lVersionstr = Encoding.UTF8.GetString(datas);
            Debug.Log($"lVersionstr =  {lVersionstr}    =====  version = {version} ");
            if (lVersionstr == version)
            {
                Debug.Log($"lVersionstr =  {lVersionstr}    =====  version = {version}   不需要更新");
                SetCheckFinish();
                return;
            }
            else
            {
                VersionCode lVersionCode = lVersionstr;//本地 local version
                VersionCode RVersionCode = version;// 远端 version
                if (RVersionCode < lVersionCode)
                {               
                    SetCheckFinish();
                }
                else if (RVersionCode.major > lVersionCode.major || (RVersionCode.major == lVersionCode.major && RVersionCode.minor > lVersionCode.minor))
                {

                    AssetDownloader.Instance.AssetLoadByCorutine(GetStreamResPath() + versionFileName, filedatas =>
                    {
                        VersionCode SVersionCode;// stream data version
                        string SVersionstr = Encoding.UTF8.GetString(filedatas);
                        SVersionCode = SVersionstr;
                        if (SVersionCode >= RVersionCode && SVersionCode >= lVersionCode)
                        {
                            Debug.Log($"lVersionstr =  {SVersionstr}    =====  version = {version}   重新安装后需要删除之前资源");
                            versionData = null;
                            ReadDataFromFile(downloadedAssetsFileName, dlocaldatas=> 
                            {
                                if (dlocaldatas != null)
                                {
                                    List<DownloadDataEntity> localdownloadedList = SerizlizeResList(dlocaldatas);
                                    if (localdownloadedList != null && localdownloadedList.Count > 0)
                                    {
                                        downloadSucessList.AddRange(localdownloadedList);
                                    }
                                    DeleteDownloadFiles();
                                }
                            });

                        }
                        else
                        {
                            Debug.Log($"lVersionstr =  {lVersionstr}    =====  version = {version}   需要更新");
                            GetRemoteResList();
                            //CheckFinish = true;
                        }
                    });

                }
                else if (RVersionCode.release > lVersionCode.release || (RVersionCode.release == lVersionCode.release && RVersionCode.patch > lVersionCode.patch))
                {
                    Debug.Log($"lVersionstr =  {lVersionstr}    =====  version = {version}   需要更新");
                    GetRemoteResList();
                }
                else
                {
                    SetCheckFinish();
                }
            }
        }
    }

    private void OnloadedLocalResList(byte[] datas)
    {
        if (datas == null)
        {
           
        }
        else
        {
            List<DownloadDataEntity> localList = SerizlizeResList(datas);
            if (localList != null)
            {
                int size = localList.Count;
                for (int i = 0; i < size; i++)
                {
                    localResMap.Add(localList[i].FullName, localList[i]);
                }
            }
        }

        ReadDataFromFile(downloadedAssetsFileName, OnloadedDownloadResList);  

    }

    private void OnloadedDownloadResList(byte[] datas)
    {
        if (datas != null)
        {
            List<DownloadDataEntity> localdownloadedList = SerizlizeResList(datas);
            if (localdownloadedList != null && localdownloadedList.Count > 0)
            {
                downloadSucessList.AddRange(localdownloadedList);
            }
        }
        GetNeedDownloadlist();
        DownLoadRemoteRes();
    }


    private List<DownloadDataEntity> GetLoacalResList(string path)
    {
        List<DownloadDataEntity> resList = null;

        if (System.IO.File.Exists(path))
        {
            byte[] data = System.IO.File.ReadAllBytes(path);

            resList = SerizlizeResList(data);
        }

        return resList;
    }


    private void GetNeedDownloadlist()
    {
        string ver = "Version";
        if (localResMap.ContainsKey(ver) && remoteResMap.ContainsKey(ver)&& localResMap[ver].MD5 == remoteResMap[ver].MD5)
        {
            Debug.Log("版本为最新状态");
            SetCheckFinish();
            //string savepath = localFilePath + downloadedAssetsFileName;
            //FileHelper.DeleteFile(savepath);
            return;
        }

        if (localResMap == null || localResMap.Count <= 0)
        {
            foreach (var item in remoteResMap)
            {
                needDownloadList.Add(item.Value);
            }
        }
        else
        {

            foreach (var item in remoteResMap)
            {
                if (item.Key == ver)
                {
                    continue;
                }
                if (!localResMap.ContainsKey(item.Key) || localResMap[item.Key].MD5 != item.Value.MD5)
                {
                    Debug.Log($"需跟新文件：{item.Value.FullName}");
                    needDownloadList.Add(item.Value);
                }
            }
        }
        CheckFinish = true;
    }

    private string GetRemoteUrl( string name)
    {
        return downloadUrl + name;
    }

    private LocalFilePathInfo GetLocalFilePath(string name, bool onlyLocal = false, uint streamPerPath = 0)
    {
        LocalFilePathInfo ret = new LocalFilePathInfo();
        string path  = LocalFilePath + name;
        ret.IsLocalRW = true;
        if (!FileSystem.Exists(path))
        {
            Debug.Log($" ========= LocalFilePath Path = {path}  不存在");
            if (!onlyLocal)
            {
                string lpPath = GetStreamResPath();
                for (int i = 0; i < streamPerPath; i++)
                {
                    lpPath += "../";
                }
                path = lpPath + name;
            }
            ret.IsLocalRW = false;        
        }

        ret.Path = path;
        Debug.Log($" ========= local Path = {path} ");
        return ret;
    }


    private void ReadDataFromFile(string name,Action<byte[]> callback,bool onlyLocal = false,uint streamPerPath = 0)
    {
        LocalFilePathInfo dlocalPath = GetLocalFilePath(name,onlyLocal, streamPerPath);


        if (dlocalPath.IsLocalRW)
        {
            try
            {
                byte[] dlocaldatas = File.ReadAllBytes(dlocalPath.Path);
                callback?.Invoke(dlocaldatas);
            }
            catch
            {
                Debug.Log("读取失败" + dlocalPath.Path);
                callback?.Invoke(null);
            }
        }
        else if(onlyLocal)
        {
            callback?.Invoke(null);
        }
        else
        {
            AssetDownloader.Instance.AssetLoadByCorutine(dlocalPath.Path, callback);
        }
    }
    private IEnumerator DeleteFiles()
    {
      ;
        int length = downloadSucessList.Count;
        string savepath = null;
        for (int i = 0; i < length; i++)
        {
            if (downloadSucessList[i].FullName == "font.unity3d")
            {
                Debug.Log("跳过删除");
                continue;
            }

            savepath = localFilePath + downloadSucessList[i].FullName;
            Debug.Log(savepath);
            FileHelper.DeleteFile(savepath);
            yield return null;
        }

       
        FileHelper.DeleteFile(localFilePath + downloadedAssetsFileName);
        yield return null;
        FileHelper.DeleteFile(localFilePath + versionFileName);
        yield return null;
        FileHelper.DeleteFile(LocalFilePath + assetsFileName);
        yield return null;
        SetCheckFinish();
    }

    public void DeleteDownloadFiles()
    {
        AssetDownloader.Instance.DoByCorutine(DeleteFiles);
    }

    public void Free()
    {
       
        if (!DowmloadError)
        {
            if (!string.IsNullOrEmpty(versionData))
            {
                FileHelper.WirteStringToFile(localFilePath + versionFileName, versionData);
                ResVersion = versionData;
            }
                   
            if (remoteResList.Count > 0)
            {
              
                CsvWriter<DownloadDataEntity> csvWriter = new CsvWriter<DownloadDataEntity>(LocalFilePath + assetsFileName, "", remoteResList, downloadFormatInfo);
                csvWriter.Write();
            }          
        }        
        needDownloadList = null;
        downloadSucessList = null;
        remoteResList = null;
        localResMap = null;
        remoteResMap = null;
        versionData = null;
        //mainfestData = null; 
        AssetDownloader.Instance.ClearTasks();
    }
}