using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web;

namespace FTP.Models
{
    public class FilesHelper
    {
        public Dictionary<string, string> directorys = new Dictionary<string, string>();
        public List<string> lists = new List<string>();
        OperationResult operation = new OperationResult();
        public int count = 1;
        public string counts;
        bool flag;

        #region 递归获取Windows目录下的文件和文件夹,返回一个元组
        /// <summary>
        /// 递归获取Windows目录下的文件和文件夹
        /// </summary>
        /// <param name="sourcePath">文件绝对路径</param>
        /// <returns></returns>
        public Tuple<OperationResult, List<string>, Dictionary<string, string>> GetDirectoryAndFile(string sourcePath)
        {
            GetDirectory(sourcePath);
            if (lists.Count > 0)
            {
                operation.isOk = true;
                operation.returnValue = "获取递归文件夹和文件列表成功";
                return new Tuple<OperationResult, List<string>, Dictionary<string, string>>(operation, lists, directorys);
            }
            operation.isOk = false;
            operation.returnValue = "获取递归文件夹和文件列表失败";
            return new Tuple<OperationResult, List<string>, Dictionary<string, string>>(operation, lists, directorys);
        }

        /// <summary>
        /// 递归获取Windows目录下的文件和文件夹
        /// </summary>
        /// <param name="sourcePath">文件绝对路径</param>
        private void GetDirectory(string sourcePath)
        {
            try
            {
                //判断源文件夹是否存在
                if (Directory.Exists(sourcePath))
                {
                    //获取源文件夹中的目录及文件路径，存入字符串
                    string[] tmp = Directory.GetFileSystemEntries(sourcePath);
                    //循环遍历
                    for (int i = 0; i < tmp.Length; i++)
                    {
                        //如果是文件则存入FileList
                        if (File.Exists(tmp[i]))
                        {
                            counts = (++count).ToString();
                            lists.Add(sourcePath);
                            directorys.Add(counts, tmp[i]);
                        }
                        else
                        {
                            GetDirectory(tmp[i]);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                return;
            }
        }
        #endregion


        //#region 工具方法：ASP.NET上传文件的方法
        ///// <summary>
        ///// 工具方法：上传文件的方法
        ///// </summary>
        ///// <param name="myFileUpload">上传控件的ID</param>
        ///// <param name="allowExtensions">允许上传的扩展文件名类型,如：string[] allowExtensions = { ".doc", ".xls", ".ppt", ".jpg", ".gif" };</param>
        ///// <param name="maxLength">允许上传的最大大小，以M为单位</param>
        ///// <param name="savePath">保存文件的目录，注意是绝对路径,如：Server.MapPath("~/upload/");</param>
        ///// <param name="saveName">保存的文件名，如果是""则以原文件名保存</param>
        //public OperationResult FilesUpload(FileUpload myFileUpload, string[] allowExtensions, int maxLength, string savePath, string saveName)
        //{
        //    //文件格式是否允许上传
        //    bool fileAllow = false;
        //    //检查是否有文件案
        //    if (myFileUpload.HasFile)
        //    {
        //        //检查文件大小, ContentLength获取的是字节，转成M的时候要除以2次1024
        //        if (myFileUpload.PostedFile.ContentLength / 1024 / 1024 >= maxLength)
        //        {
        //            operation.isOk = false;
        //            operation.tRes = "只能上传小于" + maxLength.ToString() + "的文件！";
        //            return operation;
        //        }
        //        //取得上传文件之扩展文件名，并转换成小写字母
        //        string fileExtension = System.IO.Path.GetExtension(myFileUpload.FileName).ToLower();
        //        string tmp = "";   // 存储允许上传的文件后缀名
        //        //检查扩展文件名是否符合限定类型
        //        for (int i = 0; i < allowExtensions.Length; i++)
        //        {
        //            tmp += i == allowExtensions.Length - 1 ? allowExtensions[i] : allowExtensions[i] + ",";
        //            if (fileExtension == allowExtensions[i])
        //            {
        //                fileAllow = true;
        //            }
        //        }
        //        if (fileAllow)
        //        {
        //            try
        //            {
        //                string path = savePath + (saveName == "" ? myFileUpload.FileName : saveName);
        //                //存储文件到文件夹
        //                myFileUpload.SaveAs(path);
        //            }
        //            catch (Exception ex)
        //            {
        //                operation.isOk = false;
        //                operation.tRes = "文件上传错误,错误原因:" + ex.ToString();
        //                return operation;
        //            }
        //        }
        //        else
        //        {
        //            operation.isOk = false;
        //            operation.tRes = "文件格式不符，可以上传的文件格式为：" + tmp;
        //            return operation;
        //        }
        //    }
        //    else
        //    {
        //        operation.isOk = false;
        //        operation.tRes = "请选择要上传的文件!";
        //        return operation;
        //    }
        //    operation.isOk = true;
        //    operation.tRes = "文件上传成功!";
        //    return operation;
        //}
        //#endregion


        #region 返回文件是否存在
        /// <summary>
        /// 返回文件是否存在
        /// </summary>
        /// <param name="SouthPath">文件地址</param>
        /// <returns>是否存在</returns>
        public OperationResult FileExists(string SouthPath)
        {
            flag = System.IO.File.Exists(SouthPath);
            if (flag)
            {
                operation.tRes = "文件存在!";
            }
            else
            {
                operation.tRes = "文件不存在!";
            }
            operation.isOk = flag;
            return operation;
        }
        #endregion


        #region 判断文件名是否为浏览器可以直接显示的图片文件名
        /// <summary>
        /// 判断文件名是否为浏览器可以直接显示的图片文件名
        /// </summary>
        /// <param name="filename">文件名</param>
        /// <returns>是否可以直接显示</returns>
        public OperationResult IsImgFilename(string filename)
        {
            filename = filename.Trim();
            if (filename.EndsWith(".") || filename.IndexOf(".") == -1)
            {
                operation.isOk = false;
                operation.tRes = "文件不可以直接显示!";
                return operation;
            }
            string extname = filename.Substring(filename.LastIndexOf(".") + 1).ToLower();
            flag = (extname == "jpg" || extname == "jpeg" || extname == "png" || extname == "bmp" || extname == "gif");
            if (flag)
            {
                operation.tRes = "文件可以直接显示!";
            }
            operation.isOk = flag;
            operation.tRes = "文件不可以直接显示!";
            return operation;
        }
        #endregion


        #region 复制当前目录的所有文件
        /// <summary>
        /// 复制当前目录的所有文件
        /// </summary>
        /// <param name="sourceDir">原始目录</param>
        /// <param name="targetDir">目标目录</param>
        /// <param name="overWrite">如果为true,覆盖同名文件,否则不覆盖</param>
        /// <param name="copySubDir">如果为true,包含子目录,否则不包含</param>
        public OperationResult CopyAllFiles(string sourceDir, string targetDir, bool overWrite, bool copySubDir)
        {
            //目录不存在首先创建目录
            if (!Directory.Exists(targetDir))
            {
                Directory.CreateDirectory(targetDir);
            }
            try
            {
                //辅助当前目录文件
                foreach (string sourceFileName in Directory.GetFiles(sourceDir))
                {
                    string targetFileName = Path.Combine(targetDir, sourceFileName.Substring(sourceFileName.LastIndexOf('\\') + 1));

                    if (File.Exists(targetFileName))
                    {
                        if (overWrite == true)
                        {
                            File.SetAttributes(targetFileName, FileAttributes.Normal);
                            File.Copy(sourceFileName, targetFileName, overWrite);
                        }
                    }
                    else
                    {
                        File.Copy(sourceFileName, targetFileName, overWrite);
                    }
                }
                if (copySubDir)
                {
                    foreach (string sourceSubDir in Directory.GetDirectories(sourceDir))
                    {
                        string targetSubDir = Path.Combine(targetDir, sourceSubDir.Substring(sourceSubDir.LastIndexOf('\\') + 1));
                        if (!Directory.Exists(targetSubDir))
                        {
                            Directory.CreateDirectory(targetSubDir);
                        }
                        CopyAllFiles(sourceSubDir, targetSubDir, overWrite, true);
                    }
                }
                operation.isOk = true;
                operation.returnValue = string.Format("复制目录 {0}的文件到目录 {1}成功,总计复制{2}个文件!", sourceDir, targetDir, count.ToString());
            }
            catch (Exception ex)
            {
                operation.isOk = false;
                operation.returnValue = string.Format("复制目录 {0}的文件到目录 {1}失败,失败原因：{3}!", sourceDir, targetDir, ex.ToString());
            }
            return operation;
        }
        #endregion


        #region 剪切/移动指定目录的所有文件
        /// <summary>
        /// 移动当前目录的文件
        /// </summary>
        /// <param name="sourceDir">原始目录</param>
        /// <param name="targetDir">目标目录</param>
        /// <param name="overWrite">如果为true,覆盖同名文件,否则不覆盖</param>
        /// <param name="moveSubDir">如果为true,包含目录,否则不包含</param>
        public OperationResult MoveFiles(string sourceDir, string targetDir, bool overWrite, bool moveSubDir)
        {
            //目录不存在首先创建目录
            if (!Directory.Exists(targetDir))
            {
                Directory.CreateDirectory(targetDir);
            }
            try
            {
                //移动当前目录文件
                foreach (string sourceFileName in Directory.GetFiles(sourceDir))
                {
                    string targetFileName = Path.Combine(targetDir, sourceFileName.Substring(sourceFileName.LastIndexOf('\\') + 1));
                    if (File.Exists(targetFileName))
                    {
                        if (overWrite == true)
                        {
                            File.SetAttributes(targetFileName, FileAttributes.Normal);
                            File.Delete(targetFileName);
                            File.Move(sourceFileName, targetFileName);
                        }
                    }
                    else
                    {
                        File.Move(sourceFileName, targetFileName);
                    }
                }
                if (moveSubDir)
                {
                    foreach (string sourceSubDir in Directory.GetDirectories(sourceDir))
                    {
                        string targetSubDir = Path.Combine(targetDir, sourceSubDir.Substring(sourceSubDir.LastIndexOf('\\') + 1));
                        if (!Directory.Exists(targetSubDir))
                        {
                            Directory.CreateDirectory(targetSubDir);
                        }
                        MoveFiles(sourceSubDir, targetSubDir, overWrite, true);
                        Directory.Delete(sourceSubDir);
                    }
                }
                operation.isOk = true;
                operation.returnValue = string.Format("移动目录 {0}的所有文件到目录 {1}成功!", sourceDir, targetDir);
            }
            catch (Exception ex)
            {
                operation.isOk = false;
                operation.returnValue = string.Format("移动目录 {0}的所有文件到目录 {1}失败,失败原因：{3}!", sourceDir, targetDir, ex.ToString());
            }
            return operation;
        }
        #endregion


        #region 删除指定目录的所有文件和子目录
        /// <summary>
        /// 删除指定目录的所有文件和子目录
        /// </summary>
        /// <param name="TargetDir">操作目录</param>
        /// <param name="delSubDir">如果为true,包含对子目录的操作</param>
        public OperationResult DeleteDirectoryFiles(string TargetDir, bool delSubDir)
        {
            //判断目录是否存在
            flag = Directory.Exists(TargetDir);
            try
            {
                if (flag)
                {
                    foreach (string fileName in Directory.GetFiles(TargetDir))
                    {
                        File.SetAttributes(fileName, FileAttributes.Normal);
                        File.Delete(fileName);
                    }
                    if (delSubDir)
                    {
                        DirectoryInfo dir = new DirectoryInfo(TargetDir);
                        foreach (DirectoryInfo subDi in dir.GetDirectories())
                        {
                            DeleteDirectoryFiles(subDi.FullName, true);
                            subDi.Delete();
                        }
                    }
                    operation.returnValue = string.Format("删除目录 {0} 下的文件成功", TargetDir);
                }
            }
            catch (Exception ex)
            {
                operation.returnValue = string.Format("删除目录 {0} 下的文件失败", TargetDir);
            }
            operation.isOk = flag;
            return operation;
        }
        #endregion


        #region 删除指定目录下的指定文件
        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="sourcePath">文件路径</param>
        public OperationResult DeleteFiles(string sourcePath)
        {
            //判断目录是否存在
            flag = File.Exists(sourcePath);
            try
            {
                if (flag)
                {
                    File.Delete(sourcePath);
                }
                operation.isOk = true;
                operation.returnValue = string.Format("删除路径 {0} 下的文件成功", sourcePath);
            }
            catch (Exception ex)
            {
                operation.isOk = false;
                operation.returnValue = string.Format("删除路径 {0} 下的文件失败，失败原因:{1}", sourcePath, ex.ToString());
            }
            return operation;
        }
        #endregion


        #region 创建指定目录
        /// <summary>
        /// 创建指定目录
        /// </summary>
        /// <param name="targetDir"></param>
        public OperationResult CreateDirectory(string targetDir)
        {
            DirectoryInfo dir = new DirectoryInfo(targetDir);
            flag = dir.Exists;
            try
            {
                if (!flag)
                {
                    dir.Create();
                }
                operation.isOk = !flag;
                operation.returnValue = string.Format("创建指定目录{0}成功", targetDir);
            }
            catch (Exception ex)
            {
                operation.isOk = false;
                operation.returnValue = string.Format("创建指定目录{0}失败，失败原因{1}", targetDir, ex.ToString());
            }
            return operation;
        }
        #endregion


        #region 建立子目录
        /// <summary>
        /// 建立子目录
        /// </summary>
        /// <param name="parentDir">目录路径</param>
        /// <param name="subDirName">子目录名称</param>
        public OperationResult CreateChildDirectory(string parentDir, string subDirName)
        {
            string path = parentDir + "\\" + subDirName;
            return CreateDirectory(path);
        }
        #endregion


        #region 重命名文件夹
        /// <summary>
        /// 重命名文件夹
        /// </summary>
        /// <param name="OldFloderName">原路径文件夹名称</param>
        /// <param name="NewFloderName">新路径文件夹名称</param>
        /// <returns></returns>
        public bool ReNameFloder(string OldFloderName, string NewFloderName)
        {
            try
            {
                if (Directory.Exists(OldFloderName))
                {
                    Directory.Move(OldFloderName, NewFloderName);
                }
                return true;
            }
            catch
            {
                return false;
            }
        }
        #endregion


        #region 删除指定目录
        /// <summary>
        /// 删除指定目录
        /// </summary>
        /// <param name="targetDir">目录路径</param>
        public OperationResult DeleteDirectory(string targetDir)
        {
            DirectoryInfo dirInfo = new DirectoryInfo(targetDir);
            if (dirInfo.Exists)
            {
                return DeleteDirectoryFiles(targetDir, true);
            }
            operation.isOk = false;
            operation.returnValue = string.Format("目录{0}不存在", targetDir);
            return operation;
        }
        #endregion


        #region 检测目录是否存在
        /// <summary>
        /// 检测目录是否存在
        /// </summary>
        /// <param name="StrPath">路径</param>
        /// <returns></returns>
        public bool DirectoryIsExists(string StrPath)
        {
            DirectoryInfo dirInfo = new DirectoryInfo(StrPath);
            return dirInfo.Exists;
        }

        /// <summary>
        /// 检测目录是否存在
        /// </summary>
        /// <param name="StrPath">路径</param>
        /// <param name="Create">如果不存在，是否创建</param>
        public void DirectoryIsExists(string StrPath, bool Create)
        {
            DirectoryInfo dirInfo = new DirectoryInfo(StrPath);
            flag = DirectoryIsExists(StrPath);
            if (!flag)
            {
                if (Create)
                {
                    dirInfo.Create();
                }
            }
        }
        #endregion


        #region 删除指定目录的所有子目录,不包括对当前目录文件的删除
        /// <summary>
        /// 删除指定目录的所有子目录,不包括对当前目录文件的删除
        /// </summary>
        /// <param name="targetDir">目录路径</param>
        public OperationResult DeleteSubDirectory(string targetDir)
        {
            flag = DirectoryIsExists(targetDir);
            if (flag)
            {
                foreach (string subDir in Directory.GetDirectories(targetDir))
                {
                    DeleteDirectory(subDir);
                }
                operation.returnValue = string.Format("删除目录{0}下的所有子目录成功", targetDir);
            }
            operation.isOk = flag;
            operation.returnValue = string.Format("目录{0}不存在", targetDir);
            return operation;
        }
        #endregion


        #region 获取文件最后修改时间
        /// <summary>
        /// 获取文件最后修改时间
        /// </summary>
        /// <param name="FileUrl">文件真实路径</param>
        /// <returns></returns>
        public DateTime GetFileWriteTime(string FileUrl)
        {
            return File.GetLastWriteTime(FileUrl);
        }
        #endregion


        #region 重命名文件
        /// <summary>
        /// 重命名文件
        /// </summary>
        /// <param name="OldFileName">旧文件真实路径</param>
        /// <param name="NewFileName">新文件真实路径</param>
        /// <returns></returns>
        public OperationResult RenameFile(string OldFileName, string NewFileName)
        {
            flag = File.Exists(OldFileName);
            if (flag)
            {
                File.Move(OldFileName, NewFileName);
                operation.isOk = flag;
                operation.returnValue = string.Format("旧文件{0}重命名为新文件{1}成功", OldFileName, NewFileName);
                return operation;
            }
            operation.isOk = flag;
            operation.returnValue = string.Format("旧文件{0}不存在", OldFileName);
            return operation;
        }
        #endregion


        #region 返回指定路径的文件的扩展名
        /// <summary>
        /// 返回指定路径的文件的扩展名
        /// </summary>
        /// <param name="PathFileName">完整路径的文件</param>
        /// <returns></returns>
        public string GetFileExtension(string PathFileName)
        {
            return Path.GetExtension(PathFileName);
        }
        #endregion


        #region 判断是否是隐藏文件
        /// <summary>
        /// 判断是否是隐藏文件
        /// </summary>
        /// <param name="path">文件路径</param>
        /// <returns></returns>
        public bool IsHiddenFile(string path)
        {
            FileAttributes MyAttributes = File.GetAttributes(path);
            string MyFileType = MyAttributes.ToString();
            if (MyFileType.LastIndexOf("Hidden") != -1) //是否隐藏文件
            {
                return true;
            }
            return false;
        }
        #endregion


        #region 以只读方式读取文本文件
        /// <summary>
        /// 以只读方式读取文本文件
        /// </summary>
        /// <param name="FilePath">文件路径及文件名</param>
        /// <returns></returns>
        public string ReadTxtFile(string FilePath)
        {
            flag = File.Exists(FilePath);
            string content = "";//返回的字符串
            if (flag)
            {
                using (FileStream fs = new FileStream(FilePath, FileMode.Open))
                {
                    using (StreamReader reader = new StreamReader(fs, Encoding.UTF8))
                    {
                        string text = string.Empty;
                        while (!reader.EndOfStream)
                        {
                            text += reader.ReadLine() + "\r\n";
                            content = text;
                        }
                    }
                }
            }
            return content;
        }
        #endregion


        #region 将内容写入文本文件(如果文件path存在就打开，不存在就新建)
        /// <summary>
        /// 将内容写入文本文件(如果文件path存在就打开，不存在就新建)
        /// </summary>
        /// <param name="FilePath">文件路径</param>
        /// <param name="WriteStr">要写入的内容</param>
        /// <param name="FileModes">写入模式：append 是追加写, CreateNew 是覆盖</param>
        public OperationResult WriteStrToTxtFile(string FilePath, string WriteStr, FileMode FileModes)
        {
            flag = File.Exists(FilePath);
            operation.isOk = flag;
            if (flag)
            {
                FileStream fst = new FileStream(FilePath, FileModes);
                StreamWriter swt = new StreamWriter(fst, Encoding.GetEncoding("utf-8"));
                swt.WriteLine(WriteStr);
                swt.Close();
                fst.Close();
                operation.returnValue = string.Format("写入为文件{0}数据成功", FilePath);
                return operation;
            }
            operation.returnValue = string.Format("文件{0}不存在", FilePath);
            return operation;
        }
        #endregion


        #region 获取本地驱动器名列表
        /// <summary>
        /// 获取本地驱动器名列表
        /// </summary>
        /// <returns></returns>
        public static string[] GetLocalDrives()
        {
            return Directory.GetLogicalDrives();
        }
        #endregion


        #region 获取应用程序当前可执行文件的路径
        /// <summary>
        /// 获取应用程序当前可执行文件的路径
        /// </summary>
        /// <returns></returns>
        public static string GetAppCurrentDirectory()
        {
            //return Application.StartupPath;
            return null;
        }
        #endregion


        #region 获取文件大小并以B，KB，GB，TB方式表示[+2 重载]
        /// <summary>
        /// 获取文件大小并以B，KB，GB，TB方式表示
        /// </summary>
        /// <param name="File">文件(FileInfo类型)</param>
        /// <returns></returns>
        public static string GetFileSize(FileInfo File)
        {
            string Result = "";
            long FileSize = File.Length;
            if (FileSize >= 1024 * 1024 * 1024)
            {
                if (FileSize / 1024 * 1024 * 1024 * 1024 >= 1024) Result = string.Format("{0:############0.00} TB", (double)FileSize / 1024 * 1024 * 1024 * 1024);
                else Result = string.Format("{0:####0.00} GB", (double)FileSize / 1024 * 1024 * 1024);
            }
            else if (FileSize >= 1024 * 1024) Result = string.Format("{0:####0.00} MB", (double)FileSize / 1024 * 1024);
            else if (FileSize >= 1024) Result = string.Format("{0:####0.00} KB", (double)FileSize / 1024);
            else Result = string.Format("{0:####0.00} Bytes", FileSize);
            return Result;
        }


        /// <summary>
        /// 获取文件大小并以B，KB，GB，TB方式表示
        /// </summary>
        /// <param name="FilePath">文件的具体路径</param>
        /// <returns></returns>
        public static string GetFileSize(string FilePath)
        {
            string Result = "";
            FileInfo File = new FileInfo(FilePath);
            long FileSize = File.Length;
            if (FileSize >= 1024 * 1024 * 1024)
            {
                if (FileSize / 1024 * 1024 * 1024 * 1024 >= 1024) Result = string.Format("{0:########0.00} TB", (double)FileSize / 1024 * 1024 * 1024 * 1024);
                else Result = string.Format("{0:####0.00} GB", (double)FileSize / 1024 * 1024 * 1024);
            }
            else if (FileSize >= 1024 * 1024) Result = string.Format("{0:####0.00} MB", (double)FileSize / 1024 * 1024);
            else if (FileSize >= 1024) Result = string.Format("{0:####0.00} KB", (double)FileSize / 1024);
            else Result = string.Format("{0:####0.00} Bytes", FileSize);
            return Result;
        }
        #endregion


        //#region Http下载文件
        ///// <summary>
        ///// 下载文件
        ///// </summary>
        ///// <param name="FileFullPath">下载文件下载的完整路径及名称</param>
        //public void DownLoadFiles(string FileFullPath)
        //{
        //    if (!string.IsNullOrEmpty(FileFullPath) && (FileExists(FileFullPath)).isOk)
        //    {
        //        FileInfo fi = new FileInfo(FileFullPath);                           //文件信息
        //        FileFullPath = HttpUtility.UrlEncode(FileFullPath);                 //对文件名编码
        //        FileFullPath = FileFullPath.Replace("+", "%20");                    //解决空格被编码为"+"号的问题
        //        HttpContext.Current.Response.Clear();
        //        HttpContext.Current.Response.ContentType = "application/octet-stream";
        //        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + FileFullPath);
        //        HttpContext.Current.Response.AppendHeader("content-length", fi.Length.ToString()); //文件长度
        //        int chunkSize = 102400;                                             //缓存区大小,可根据服务器性能及网络情况进行修改
        //        byte[] buffer = new byte[chunkSize];                                //缓存区
        //        using (FileStream fs = fi.Open(FileMode.Open))                      //打开一个文件流
        //        {
        //            //如果没到文件尾并且客户在线
        //            while (fs.Position >= 0 && HttpContext.Current.Response.IsClientConnected)
        //            {
        //                int tmp = fs.Read(buffer, 0, chunkSize);                //读取一块文件
        //                if (tmp <= 0) break;                                    //tmp=0说明文件已经读取完毕,则跳出循环
        //                HttpContext.Current.Response.OutputStream.Write(buffer, 0, tmp);//向客户端传送一块文件
        //                HttpContext.Current.Response.Flush();//保证缓存全部送出
        //                Thread.Sleep(10);                                       //主线程休息一下,以释放CPU
        //            }
        //        }
        //    }
        //}
        //#endregion
    }
}