using System;
using System.IO;
using UnityEngine;
using System.Text;
using System.Collections;
using UnityEngine.Networking;
using System.Threading.Tasks;
using System.Threading;
using System.Collections.Generic;

namespace XRTool.Util
{
    /// <summary>
    /// 文件工具类
    /// 下载，写入文件，断点续传，边下边存
    /// 遍历，拷贝文件
    /// 获取文件的MD5等
    /// </summary>
    public class DataFileUtil
    {
        /// <summary>
        /// 预估的写入文件的速度，与真实速度无关，仅仅是模拟评估，预计写入用时
        /// </summary>
        public const float WriteSpeed = 1024 * 1024 * 150f;
        ///// <summary>
        ///// 写入缓存的大小，如果越小，可能会引起卡顿（频繁访问数据）
        ///// </summary>
        //public const int CacheSave = 1024 * 1024 * 2;
        /// <summary>
        /// 图片格式
        /// </summary>
        public static string[] TexturesType = new string[] { "BMP", "EXR", "GIF", "HDR", "IFF", "JPG", "PICT", "PNG", "PSD", "TGA", "TIFF" };
        /// <summary>
        /// 视频格式
        /// </summary>
        public static string[] MoviesType = new string[] { "MOV", "MPG", "MP4", "AVI", "ASF" };
        /// <summary>
        /// 音频格式
        /// </summary>
        public static string[] AudiosType = new string[] { "ACC", "AIFF", "IT", "MOD", "MPEG", "OGGVORBIS", "S3M",
            "AIF", "WAV", "MP3", "OGG","XM","XMA","VAG","AUDIOQUEUE" };
        public static int maxTryCount = 5;
        public const string Extension = ".downing";

        ///// <summary>
        ///// 断点下载，异步读写
        ///// </summary>
        ///// <param name="url"></param>
        ///// <param name="path"></param>
        ///// <param name="completeData"></param>
        ///// <param name="hander"></param>
        ///// <param name="downLoadProcess"></param>
        ///// <returns></returns>
        //public static IEnumerator DownLoadDataAsync(string url, string path,
        //    Action<string, UnityWebRequest> completeData, DownloadHandler hander = null, Action<float, float> downLoadProcess = null)
        //{

        //    yield return 0;
        //}
        /// <summary>
        /// 下载数据到本地，并将下载的数据返回给到上层应用
        /// 此下载仅应用于可缓存的资源，图片文本等下载，大文件的下载请使用断点下载
        /// </summary>
        /// <param name="url"></param>
        /// <param name="path"></param>
        /// <param name="downLoadProcess"></param>
        /// <param name="completeData"></param>
        /// <param name="isAsync"></param>
        /// <returns></returns>
        public static IEnumerator DownLoadData(string url, string path,
            Action<string, UnityWebRequest> completeData, DownloadHandler hander = null, Action<float, float> downLoadProcess = null, bool isAsync = false)
        {
            UnityWebRequest web = null;
            //DownloadHandlerTexture
            yield return RequestDownData(url, (string error, UnityWebRequest req) =>
           {
               ///下载成功后开始拷贝数据到本地
               if (string.IsNullOrEmpty(error))
               {
                   ///同步存储方法
                   if (!isAsync)
                   {
                       SaveDataToFile(path, req.downloadHandler.data);
                       downLoadProcess?.Invoke(req.downloadHandler.data.Length, 1);
                       completeData?.Invoke(path, req);
                       return;
                   }
                   else
                   {
                       web = req;
                       ///此时，已下载到内存中，但是仍未缓存至内存中，内存数据可用
                       completeData?.Invoke(null, req);
                   }
               }
               else
               {
                   ///下载出错
                   completeData?.Invoke(null, null);
                   //UnityLog.LogError(error);
               }
           }, hander, (float allLeng, float process) =>
           {
               ///下载的进度，1/1.2，给存储留进度条显示，约等于0.89
               downLoadProcess?.Invoke(allLeng, process / 1.12f);
           });
            ///等待下载完成，此下载是下载到内存中
            if (isAsync && web != null)
            {
                //completeData?.Invoke(true, data);
                yield return SaveDataToFile(path, web.downloadHandler.data, (float saveProcess) =>
                {
                    ///更新存储文件的进度
                    downLoadProcess?.Invoke(web.downloadHandler.data.Length, saveProcess * 0.1f + 0.9f);
                }, (bool isSuccess, string filePath) =>
                {
                    completeData?.Invoke(filePath, web);
                });
            }
            web.Dispose();
        }

        /// <summary>
        /// 请求后台数据接口
        /// </summary>
        /// <returns></returns>
        public static IEnumerator RequestData(string url, Action<string> reqComplete, bool isPost = true,
            Dictionary<string, string> header = null, Dictionary<string, string> form = null, Action complete = null)
        {
            ///表单
            using (UnityWebRequest web = isPost ? UnityWebRequest.Post(url, form) : UnityWebRequest.Get(url))
            {
                if (header != null)
                {
                    foreach (var item in header)
                    {
                        web.SetRequestHeader(item.Key, item.Value);
                    }
                }
                yield return web.SendWebRequest();
                if (web.isNetworkError || web.isHttpError)
                {
                    UnityLog.LogError("RequestData:" + url + web.error);
                    reqComplete?.Invoke(null);
                    complete?.Invoke();
                    yield break;
                }
                else
                {
                    reqComplete?.Invoke(web.downloadHandler.text);
                    complete?.Invoke();
                }
            }
        }
        /// <summary>
        /// 获取资源的大小
        /// </summary>
        /// <param name="url"></param>
        /// <param name="getLen"></param>
        /// <returns></returns>
        public static IEnumerator GetDataSize(string url, Action<long> getLen)
        {
            var headRequest = UnityWebRequest.Head(url);
            yield return headRequest.SendWebRequest();
            getLen?.Invoke(long.Parse(headRequest.GetResponseHeader("Content-Length")));
            headRequest.Dispose();
        }
        
        
        /// <summary>
        /// 断点续传
        /// 下载大文件请使用此函数
        /// 注意，请自行检查是否已下载过此文件，此函数不再检查，直接执行下载
        /// </summary>
        /// <param name="url"></param>
        /// <param name="path"></param>
        /// <param name="completeData"></param>
        /// <param name="hander"></param>
        /// <param name="downLoadProcess"></param>
        /// <returns></returns>
        public static IEnumerator DownLoadDataAsync(string url, string path,
            Action<string, UnityWebRequest> completeData, DownloadHandler hander = null, Action<float, float> downLoadProcess = null)
        {
            ///获取文件的大小
            FileStream fs = null;
            long curLen = 0;
            string tmpPath = path + Extension;
            ///文件读写异常，返回错误
            try
            {
                string dir = Path.GetDirectoryName(tmpPath);
                if (!Directory.Exists(dir))
                {
                    Directory.CreateDirectory(dir);
                }
                fs = new FileStream(tmpPath, FileMode.OpenOrCreate);
                curLen = fs.Length;
                UnityLog.Log("当前文件大小" + curLen, 2);
            }
            catch (Exception ex)
            {
                if (fs != null)
                {
                    fs.Dispose();
                }
                fs = null;
                UnityLog.LogError(tmpPath + ex.ToString());
                downLoadProcess.Invoke(curLen, 0);
                completeData?.Invoke(null, null);
                yield break;
            }

            ///请求获取文件的大小
            ///已下载完成，无需再次下载
            long totalLength = 0;
            yield return GetDataSize(url, (size) =>
            {
                totalLength = size;
            });
            ///当前文件的大小和云端文件大小一致
            ///理论上不会出现这个问题
            if (curLen == totalLength)
            {
                fs.Dispose();
                fs.Close();
                downLoadProcess.Invoke(totalLength, 1);
                ReNameFile(tmpPath,path);
                completeData?.Invoke(path, null);
                yield break;
            }
            ///文件异常,删除文件，重新下载
            ///理论上不会出现这个问题
            else if (curLen > totalLength)
            {
                UnityLog.LogError("文件大小异常" + curLen + "__" + totalLength);
                fs.Dispose();
                fs.Close();
                File.Delete(tmpPath);
                fs = new FileStream(tmpPath, FileMode.OpenOrCreate, FileAccess.Write);
                curLen = fs.Length;
            }
            fs.Seek(curLen, SeekOrigin.Begin);
            bool isSuccess = true;
            yield return RequestDownData(url, (byte[] data, int len) =>
            {
                if (isSuccess && data.Length > 0)
                {
                    try
                    {
                        fs.Write(data, 0, len);
                        fs.Flush();
                        curLen += len;
                        downLoadProcess?.Invoke(curLen, curLen * 1f / totalLength);
                    }
                    catch (Exception ex)
                    {
                        UnityLog.LogError(ex.ToString());
                        isSuccess = false;
                        return;
                    }
                }
                else
                {
                    ///理论上不会出现这个问题，除非出现异常情况如内存不足等
                    //complete?.Invoke(isSuccess, path);
                    UnityLog.LogError("Down Error:" + url);
                }
            }, totalLength, curLen, (web) =>
            {
                fs.Dispose();
                fs.Close();
                downLoadProcess.Invoke(totalLength, 1);
                ReNameFile(tmpPath,path);
                completeData?.Invoke(path, web);
            });

        }
        /// <summary>
        /// Get请求下载数据,断点下载，边下载边返回数据进行存储
        /// </summary>
        /// <param name="url">url</param>
        /// <param name="downData">返回获取的数据</param>
        /// <param name="allLen">文件的总大小</param>
        /// <param name="downedLength">已下载的数据</param>
        /// <returns></returns>
        public static IEnumerator RequestDownData(string url, Action<byte[], int> downData, long allLen, long downedLength = 0,
            Action<UnityWebRequest> complete = null)
        {
            //float downTime = Time.time;
            using (UnityWebRequest web = UnityWebRequest.Get(url))
            {
                web.disposeDownloadHandlerOnDispose = true;
                DataDownLoadHandler ddh = new DataDownLoadHandler();
                web.downloadHandler = ddh;
                ddh.OnReceiveData += downData;
                ///请求指定的长度
                web.SetRequestHeader("Range", "bytes=" + downedLength + "-" + allLen);
                yield return web.SendWebRequest();
                if (web.isNetworkError || web.isHttpError)
                {
                    UnityLog.LogError("RequestDownData" + url);
                    complete?.Invoke(null);
                }
                else
                {
                    complete?.Invoke(web);
                }
            }
        }
        /// <summary>
        /// 从URl下载指定的资源
        /// </summary>
        /// <param name="url">资源的地址，可以是网络路径，也可以是本地文件路径</param>
        /// <param name="updateProcess">下载的进度，当前已下载文件大小，以及进度</param>
        /// <param name="complete"></param>
        /// <param name="form">请求的参数，如果为空代表Get请求，不为空代表Post请求</param>
        /// <returns></returns>
        public static IEnumerator RequestDownData(string url, Action<string, UnityWebRequest> complete, DownloadHandler hander = null, Action<float, float> updateProcess = null, WWWForm form = null)
        {
            UnityWebRequest web;
            Debug.Log("RequestDownData" + url);

            if (form == null)
            {
                web = UnityWebRequest.Get(url);
            }
            else
            {
                web = UnityWebRequest.Post(url, form);
            }
            if (hander != null)
            {
                web.downloadHandler = hander;
            }
            web.SendWebRequest();
            while (!web.isDone)
            {
                updateProcess?.Invoke(web.downloadedBytes, web.downloadProgress);
                yield return 0;
            }
            if (web.isDone)
            {
                updateProcess?.Invoke(web.downloadedBytes, 1);
            }
            if (web.isNetworkError || web.isHttpError)
            {
                complete?.Invoke(web.error, web);
                Debug.LogError(web.error + url);
            }
            else
            {
                complete?.Invoke(null, web);
            }
            web.Dispose();
        }
        /// <summary>
        /// 上传数据到服务端，并得到服务器返回的结果
        /// 与下面的RequestDownData类似，但是更新上传进度，适用于文件上传
        /// </summary>
        /// <param name="url"></param>
        /// <param name="form"></param>
        /// <param name="updateProcess"></param>
        /// <param name="complete"></param>
        /// <returns></returns>
        public static IEnumerator RequestUpLoadData(string url, WWWForm form, Action<float, float> updateProcess, Action<string, UnityWebRequest> complete)
        {
            UnityWebRequest web = UnityWebRequest.Post(url, form);
            web.SendWebRequest();
            while (!web.isDone)
            {
                updateProcess?.Invoke(web.uploadedBytes, web.uploadProgress);
                yield return 0;
            }
            if (web.isDone)
            {
                updateProcess?.Invoke(web.uploadedBytes, 1);
            }
            if (web.isNetworkError || web.isHttpError)
            {
                complete?.Invoke(web.error, web);
            }
            else
            {
                complete?.Invoke(null, web);
            }
            web.Dispose();
        }
        /// <summary>
        /// 是否是忽略的文件类型
        /// </summary>
        /// <param name="sug"></param>
        /// <returns></returns>
        public static bool isIgnoreExtension(string ignoreExtension, string suffix)
        {
            string[] igs = ignoreExtension.Split('|', ' ', ',');
            for (int i = 0; i < igs.Length; i++)
            {
                if (igs[i] == suffix)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// 保存文本文件到本地
        /// 同步方法
        /// </summary>
        public static bool SaveDataToFile(string path, string txt)
        {
            try
            {
                if (!string.IsNullOrEmpty(txt))
                {
                    File.WriteAllText(path, txt);
                    return true;
                }
            }
            catch (Exception ex)
            {
                UnityLog.LogError(path + ex.ToString());
            }
            return false;
        }
        /// <summary>
        /// 保存二进制字节文件到本地，同步方法
        /// </summary>
        /// <param name="path"></param>
        /// <param name="data"></param>
        public static bool SaveDataToFile(string path, byte[] data)
        {
            try
            {
                string dir = Path.GetDirectoryName(path);
                if (!Directory.Exists(dir))
                {
                    Directory.CreateDirectory(dir);
                }
                FileStream fs = new FileStream(path, FileMode.Create);
                fs.Write(data, 0, data.Length);
                fs.Dispose();
                fs.Close();
                return true;
            }
            catch (Exception ex)
            {
                UnityLog.LogError(path + ex.ToString());
            }
            return false;
        }
        /// <summary>
        /// 异步保存文本文件
        /// </summary>
        /// <param name="path"></param>
        /// <param name="txt"></param>
        /// <param name="saveProcess"></param>
        /// <returns></returns>
        public static IEnumerator SaveDataToFile(string path, string txt, Action<float> saveProcess, Action<bool, string> onComplete)
        {
            yield return SaveDataToFile(path, Encoding.Default.GetBytes(txt), saveProcess, onComplete);
        }
        /// <summary>
        /// 保存二进制字节文件到本地，异步方法
        /// </summary>
        /// <param name="path"></param>
        /// <param name="data"></param>
        private static IEnumerator SaveDataToFile(string path, byte[] data, Action<float> saveProcess, Action<bool, string> onComplete)
        {
            bool isSuccess = false;
            if (data != null && data.Length > 0)
            {
                Task task = null;
                FileStream fs = null;
                float allData = data.Length;
                try
                {
                    fs = new FileStream(path, FileMode.Create);
                    task = fs.WriteAsync(data, 0, data.Length);
                    isSuccess = true;
                }
                catch (Exception ex)
                {
                    UnityLog.LogError(path + ex.ToString());
                    path = ex.ToString();
                    isSuccess = false;
                }
                float tmp = 0;
                float allTime = data.Length / WriteSpeed;
                ///预计存储完成的时间
                while (task != null && !task.IsCompleted)
                {
                    if (tmp < allTime)
                    {
                        tmp += Time.deltaTime;
                    }
                    saveProcess?.Invoke(tmp / allTime);
                    yield return 0;
                }
                saveProcess(1);
                fs.Dispose();
                fs.Close();
            }
            onComplete?.Invoke(isSuccess, path);
        }
        /// <summary>
        /// 广度优先，遍历文件
        /// </summary>
        /// <param name="path"></param>
        /// <param name="callBack"></param>
        public static void FindFileBreadth(string path, Action<string> callBack)
        {
            try
            {
                DirectoryInfo di = new DirectoryInfo(path);
                FileInfo[] fis = di.GetFiles();
                for (int i = 0; i < fis.Length; i++)
                {
                    callBack?.Invoke(fis[i].FullName);
                }
                DirectoryInfo[] dis = di.GetDirectories();
                for (int j = 0; j < dis.Length; j++)
                {
                    FindFileBreadth(dis[j].FullName, callBack);
                }
            }
            catch (Exception ex)
            {
                UnityLog.LogError(ex.ToString());
            }
        }
        /// <summary>
        /// 深度优先，遍历文件
        /// </summary>
        /// <param name="dir"></param>
        public static void FindFileByDepth(string dir, Action<string> callBack)
        {
            try
            {
                DirectoryInfo d = new DirectoryInfo(dir);
                FileSystemInfo[] fsinfos = d.GetFileSystemInfos();
                foreach (FileSystemInfo fsinfo in fsinfos)
                {
                    if (fsinfo is DirectoryInfo)
                    {
                        FindFileByDepth(fsinfo.FullName, callBack);
                    }
                    else
                    {
                        callBack?.Invoke(fsinfo.FullName);
                    }
                }
            }
            catch (Exception ex)
            {
                UnityLog.LogError(ex.ToString());
            }
        }
        /// <summary>
        /// 获取文件MD5值
        /// </summary>
        /// <param name="fileName">文件绝对路径</param>
        /// <returns>MD5值</returns>
        public static string GetMD5HashFromFile(string fileName)
        {
            try
            {
                FileStream file = new FileStream(fileName, FileMode.Open);
                System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
                byte[] retVal = md5.ComputeHash(file);
                file.Close();
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < retVal.Length; i++)
                {
                    sb.Append(retVal[i].ToString("x2"));
                }
                return sb.ToString();
            }
            catch (Exception ex)
            {
                throw new Exception("GetMD5HashFromFile() fail,error:" + ex.Message);
            }
        }
        /// <summary>
        /// 重命名文件
        /// </summary>
        /// <param name="file"></param>
        /// <param name="newFile"></param>
        public static void ReNameFile(string file, string newFile)
        {
            if (File.Exists(file))
            {
                try
                {
                    string dir = Path.GetDirectoryName(newFile);
                    if (!Directory.Exists(dir))
                    {
                        Directory.CreateDirectory(dir);
                    }
                    if (File.Exists(newFile))
                    {
                        File.Delete(newFile);
                    }
                    FileInfo info = new FileInfo(file);
                    info.MoveTo(newFile);
                }
                catch (Exception ex)
                {
                    UnityLog.LogError(file + " is error" + ex.ToString());
                }
            }
        }
        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="file"></param>
        /// <param name="newFile"></param>
        public static void DelFile(string file)
        {
            UnityLog.Log(file + " is Del", 3);
            if (File.Exists(file))
            {
                try
                {
                    File.Delete(file);
                }
                catch (Exception ex)
                {
                    UnityLog.LogError(file + " is error" + ex.ToString());
                }
            }
        }
        /// <summary>
        /// 拷贝文件
        /// </summary>
        /// <param name="SourcePath"></param>
        /// <param name="DestinationPath"></param>
        /// <param name="overwriteexisting">是否覆盖</param>
        /// <returns></returns>
        public static bool CopyDirectory(string SourcePath, string DestinationPath, bool overwriteexisting)
        {
            bool ret = false;
            try
            {
                SourcePath = SourcePath.EndsWith(@"\") ? SourcePath : SourcePath + @"\";
                DestinationPath = DestinationPath.EndsWith(@"\") ? DestinationPath : DestinationPath + @"\";

                if (Directory.Exists(SourcePath))
                {
                    if (Directory.Exists(DestinationPath) == false)
                        Directory.CreateDirectory(DestinationPath);

                    foreach (string fls in Directory.GetFiles(SourcePath))
                    {
                        FileInfo flinfo = new FileInfo(fls);
                        flinfo.CopyTo(DestinationPath + flinfo.Name, overwriteexisting);
                    }
                    foreach (string drs in Directory.GetDirectories(SourcePath))
                    {
                        DirectoryInfo drinfo = new DirectoryInfo(drs);
                        if (CopyDirectory(drs, DestinationPath + drinfo.Name, overwriteexisting) == false)
                            ret = false;
                    }
                }
                ret = true;
            }
            catch (Exception ex)
            {
                ret = false;
                UnityLog.LogError(ex.ToString());
            }
            return ret;
        }
        /// <summary>
        /// 文件是否是图片
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static bool IsMoviesFile(string fileName)
        {
            if (!string.IsNullOrEmpty(fileName))
            {
                string exten = Path.GetExtension(fileName);
                return IsMediaType(exten.ToUpper(), MoviesType);
            }
            return false;
        }
        public static bool IsTextureFile(string fileName)
        {
            if (!string.IsNullOrEmpty(fileName))
            {
                string exten = Path.GetExtension(fileName);
                return IsMediaType(exten.ToUpper(), TexturesType);
            }
            return false;
        }
        /// <summary>
        /// 判断是否是音频文件
        /// MP3，WAV等
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static bool IsAudioFile(string fileName)
        {
            if (!string.IsNullOrEmpty(fileName))
            {
                string exten = Path.GetExtension(fileName);
                return IsMediaType(exten.ToUpper(), AudiosType);
            }
            return false;
        }
        /// <summary>
        /// 是否是多媒体文件：图片，视频，音频
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="types"></param>
        /// <returns></returns>
        public static bool IsMediaType(string fileName, string[] types)
        {
            if (!string.IsNullOrEmpty(fileName) && types != null)
            {
                for (int i = 0; i < types.Length; i++)
                {
                    if (TexturesType[i] == fileName)
                    {
                        return true;
                    }
                }
            }
            return false;
        }
        /// <summary>
        /// 是否多媒体文件
        /// 音频，视频，图片
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static bool IsMediaType(string fileName)
        {
            if (!string.IsNullOrEmpty(fileName))
            {
                string exten = Path.GetExtension(fileName);
                exten = exten.ToUpper();
                return IsMediaType(exten, TexturesType) || IsMediaType(exten, MoviesType) || IsMediaType(exten, AudiosType);
            }
            return false;
        }
        /// <summary>
        /// 是否存在某文件
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public static bool Exists(string file)
        {
            return File.Exists(file);
        }

    }
}