using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Windows.Forms;
using System.Configuration;
using System.Data;

namespace Lskj.TxtFileRead
{
    public class FtpHelper
    {
        static string ftpServerIP;
        static string ftpRemotePath;
        static string ftpUserID;
        static string ftpPassword;
        static string ftpURI;

        /// <summary>
        /// 连接FTP
        /// </summary>
        /// <param name="FtpServerIP">FTP连接地址</param>
        /// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>
        /// <param name="FtpUserID">用户名</param>
        /// <param name="FtpPassword">密码</param>
        public FtpHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword)
        {
            ftpServerIP = FtpServerIP;
            ftpRemotePath = FtpRemotePath;
            ftpUserID = FtpUserID;
            ftpPassword = FtpPassword;
            ftpURI = @"ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
        }

        /// <summary>
        /// 从ftp服务器上获取文件并将内容全部转换成string返回
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="dir"></param>
        /// <returns></returns>
        public string GetFileStr(string fileName, string dir)
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpURI);
                reqFTP.UsePassive = false;  //选择主动还是被动模式 ,  这句要加上的。
                reqFTP.KeepAlive = false;//一定要设置此属性，否则一次性下载多个文件的时候，会出现异常。
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                StreamReader reader = new StreamReader(ftpStream);
                string fileStr = reader.ReadToEnd();

                reader.Close();
                ftpStream.Close();
                response.Close();
                return fileStr;
            }
            catch (Exception ex)
            {
                MessageBox.Show("获取ftp文件并读取内容失败：" + ex.Message);
                return null;
            }
        }


        /// <summary>
        /// 下载
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="fileName"></param>
        public void Download(string filePath, string fileName)
        {
            try
            {
                FileStream outputStream = new FileStream(@filePath + "\\" + fileName, FileMode.Create);
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="filePath"></param>
        public bool fileDelete(string ftpfileName)
        {
            bool success = false;
            FtpWebRequest ftpWebRequest = null;
            FtpWebResponse ftpWebResponse = null;
            Stream ftpResponseStream = null;
            StreamReader streamReader = null;
            try
            {
                string uri = ftpURI + ftpfileName;
                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                ftpWebRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                ftpWebRequest.KeepAlive = false;
                ftpWebRequest.Method = WebRequestMethods.Ftp.DeleteFile;
                ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
                long size = ftpWebResponse.ContentLength;
                ftpResponseStream = ftpWebResponse.GetResponseStream();
                streamReader = new StreamReader(ftpResponseStream);
                string result = String.Empty;
                result = streamReader.ReadToEnd();

                success = true;
            }
            catch (Exception)
            {
                success = false;
            }
            finally
            {
                if (streamReader != null)
                {
                    streamReader.Close();
                }
                if (ftpResponseStream != null)
                {
                    ftpResponseStream.Close();
                }
                if (ftpWebResponse != null)
                {
                    ftpWebResponse.Close();
                }
            }
            return success;
        }


        //获取ftp上面的文件和文件夹
        public string[]  GetFileList()
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            FtpWebRequest request;
            try
            {
                request = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(ftpUserID, ftpPassword);//设置用户名和密码
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                request.UseBinary = true;
                request.UsePassive = false;  //选择主动还是被动模式 ,  这句要加上的。
                request.KeepAlive = false;//一定要设置此属性，否则一次性下载多个文件的时候，会出现异常。
                WebResponse response = request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());

                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                }

                result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                MessageBox.Show("获取ftp上面的文件和文件夹：" + ex.Message);
                downloadFiles = null;
                return downloadFiles;
            }
        }


        public List<string> GetAllList()
        {
            List<string> list = new List<string>();
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(ftpURI));
            req.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            req.Method = WebRequestMethods.Ftp.ListDirectory;
            req.UseBinary = true;
            req.UsePassive = true;
            try
            {
                using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
                {
                    using (StreamReader sr = new StreamReader(res.GetResponseStream()))
                    {
                        string s;
                        while ((s = sr.ReadLine()) != null)
                        {
                            list.Add(s);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            return list;
        }

        /// <summary>  
        /// 获取当前目录下明细(包含文件和文件夹)  
        /// </summary>  
        public string[] GetFilesDetailList()
        {
            try
            {
                StringBuilder result = new StringBuilder();
                FtpWebRequest ftp;
                ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = ftp.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());
                string line = reader.ReadLine();
                line = reader.ReadLine();
                line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                }
                result.Remove(result.ToString().LastIndexOf("\n"), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>  
        /// 获取指定文件大小  
        /// </summary>  
        public long GetFileSize(string filename)
        {
            FtpWebRequest reqFTP;
            long fileSize = 0;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                fileSize = response.ContentLength;
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
            return fileSize;
        }
        /// <summary>  
        /// 创建文件夹  
        /// </summary>   
        public void MakeDir(string dirName)
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
        }

        /// <summary>  
        /// 删除文件  
        /// </summary>  
        public void Delete(string fileName)
        {
            try
            {
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                reqFTP.KeepAlive = false;
                string result = String.Empty;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                long size = response.ContentLength;
                Stream datastream = response.GetResponseStream();
                StreamReader sr = new StreamReader(datastream);
                result = sr.ReadToEnd();
                sr.Close();
                datastream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>  
        /// 上传  
        /// </summary>   
        public void Upload(string filename)
        {
            FileInfo fileInf = new FileInfo(filename);
            FtpWebRequest reqFTP;
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            reqFTP.KeepAlive = false;
            reqFTP.UseBinary = true;
            reqFTP.ContentLength = fileInf.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            FileStream fs = fileInf.OpenRead();
            try
            {
                Stream strm = reqFTP.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        #region 从FTP服务器下载文件，指定本地路径和本地文件名
        /// <summary>
        /// 从FTP服务器下载文件，指定本地路径和本地文件名
        /// </summary>
        /// <param name="remoteFileName">远程文件名</param>
        /// <param name="localFileName">保存本地的文件名（包含路径）</param>
        /// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>
        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
        /// <returns>是否下载成功</returns>
        public bool FtpDownload(string remoteFileName, string localFileName, bool ifCredential, Action<int, int> updateProgress = null)
        {
            FtpWebRequest reqFTP, ftpsize;
            Stream ftpStream = null;
            FtpWebResponse response = null;
            FileStream outputStream = null;
            try
            {

                outputStream = new FileStream(localFileName, FileMode.Create);
                Uri uri = new Uri(@"ftp://" + ftpServerIP + "/" + remoteFileName);
                ftpsize = (FtpWebRequest)FtpWebRequest.Create(uri);
                ftpsize.UseBinary = true;

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
                reqFTP.UseBinary = true;
                reqFTP.KeepAlive = false;
                if (ifCredential)//使用用户身份认证
                {
                    ftpsize.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                    reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                }
                ftpsize.Method = WebRequestMethods.Ftp.GetFileSize;
                FtpWebResponse re = (FtpWebResponse)ftpsize.GetResponse();
                long totalBytes = re.ContentLength;
                re.Close();

                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                response = (FtpWebResponse)reqFTP.GetResponse();
                ftpStream = response.GetResponseStream();

                //更新进度  
                if (updateProgress != null)
                {
                    updateProgress((int)totalBytes, 0);//更新进度条   
                }
                long totalDownloadedByte = 0;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    totalDownloadedByte = readCount + totalDownloadedByte;
                    outputStream.Write(buffer, 0, readCount);
                    //更新进度  
                    if (updateProgress != null)
                    {
                        updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条   
                    }
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("下载文件出现;" + ex.Message);
                return false;
                throw;
            }
            finally
            {
                if (ftpStream != null)
                {
                    ftpStream.Close();
                }
                if (outputStream != null)
                {
                    outputStream.Close();
                }
                if (response != null)
                {
                    response.Close();
                }
            }
        }
        /// <summary>
        /// 从FTP服务器下载文件，指定本地路径和本地文件名（支持断点下载）
        /// </summary>
        /// <param name="remoteFileName">远程文件名</param>
        /// <param name="localFileName">保存本地的文件名（包含路径）</param>
        /// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>
        /// <param name="size">已下载文件流大小</param>
        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
        /// <returns>是否下载成功</returns>
        public static bool FtpBrokenDownload(string remoteFileName, string localFileName, bool ifCredential, long size, Action<int, int> updateProgress = null)
        {
            FtpWebRequest reqFTP, ftpsize;
            Stream ftpStream = null;
            FtpWebResponse response = null;
            FileStream outputStream = null;
            try
            {

                outputStream = new FileStream(localFileName, FileMode.Append);
                Uri uri = new Uri(@"ftp://" + ftpServerIP + "/" + remoteFileName);
                ftpsize = (FtpWebRequest)FtpWebRequest.Create(uri);
                ftpsize.UseBinary = true;
                ftpsize.ContentOffset = size;

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
                reqFTP.UseBinary = true;
                reqFTP.KeepAlive = false;
                reqFTP.ContentOffset = size;
                if (ifCredential)//使用用户身份认证
                {
                    ftpsize.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                    reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                }
                ftpsize.Method = WebRequestMethods.Ftp.GetFileSize;
                FtpWebResponse re = (FtpWebResponse)ftpsize.GetResponse();
                long totalBytes = re.ContentLength;
                re.Close();

                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                response = (FtpWebResponse)reqFTP.GetResponse();
                ftpStream = response.GetResponseStream();

                //更新进度  
                if (updateProgress != null)
                {
                    updateProgress((int)totalBytes, 0);//更新进度条   
                }
                long totalDownloadedByte = 0;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    totalDownloadedByte = readCount + totalDownloadedByte;
                    outputStream.Write(buffer, 0, readCount);
                    //更新进度  
                    if (updateProgress != null)
                    {
                        updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条   
                    }
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("下载文件出现;" + ex.Message);
                return false;
                throw;
            }
            finally
            {
                if (ftpStream != null)
                {
                    ftpStream.Close();
                }
                if (outputStream != null)
                {
                    outputStream.Close();
                }
                if (response != null)
                {
                    response.Close();
                }
            }
        }

        /// <summary>
        /// 从FTP服务器下载文件，指定本地路径和本地文件名
        /// </summary>
        /// <param name="remoteFileName">远程文件名</param>
        /// <param name="localFileName">保存本地的文件名（包含路径）</param>
        /// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>
        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
        /// <param name="brokenOpen">是否断点下载：true 会在localFileName 找是否存在已经下载的文件，并计算文件流大小</param>
        /// <returns>是否下载成功</returns>
        public bool FtpDownload(string remoteFileName, string localFileName, bool ifCredential, bool brokenOpen, Action<int, int> updateProgress = null)
        {
            if (brokenOpen)
            {
                try
                {
                    long size = 0;
                    if (File.Exists(localFileName))
                    {
                        using (FileStream outputStream = new FileStream(localFileName, FileMode.Open))
                        {
                            size = outputStream.Length;
                        }
                    }
                    return FtpBrokenDownload(remoteFileName, localFileName, ifCredential, size, updateProgress);
                }
                catch
                {
                    throw;
                }
            }
            else
            {
                return FtpDownload(remoteFileName, localFileName, ifCredential, updateProgress);
            }
        }
        #endregion


        /// <summary>
        /// 获取本地某个文件夹下的文件
        /// <summary>
        public string[] GetFiles(DirectoryInfo directory, string pattern)
        {
            StringBuilder sb = new StringBuilder();
            if (directory.Exists || pattern.Trim() != string.Empty)
            {
                foreach (FileInfo info in directory.GetFiles(pattern))
                {
                    sb.AppendLine(info.FullName.ToString());
                }
                foreach (DirectoryInfo info in directory.GetDirectories())
                {
                    GetFiles(info, pattern);
                }
            }
            sb.Remove(sb.ToString().LastIndexOf("\n"), 1);
            return sb.ToString().Split('\n');
        }

        /// <summary>
        /// 接删除指定目录下的所有文件及文件夹(保留目录)
        /// <summary>
        public static void DeleteDir(string file)
        {
            try
            {
                //去除文件夹和子文件的只读属性
                //去除文件夹的只读属性
                System.IO.DirectoryInfo fileInfo = new DirectoryInfo(file);
                fileInfo.Attributes = FileAttributes.Normal & FileAttributes.Directory;

                //去除文件的只读属性
                System.IO.File.SetAttributes(file, System.IO.FileAttributes.Normal);

                //判断文件夹是否还存在
                if (Directory.Exists(file))
                {
                    foreach (string f in Directory.GetFileSystemEntries(file))
                    {
                        if (File.Exists(f))
                        {
                            //如果有子文件删除文件
                            File.Delete(f);
                            Console.WriteLine(f);
                        }
                        else
                        {
                            //循环递归删除子文件夹
                            DeleteDir(f);
                        }
                    }

                    //删除空文件夹
                    //Directory.Delete(file);
                    Console.WriteLine(file);
                }

            }
            catch (Exception ex) // 异常处理
            {
                Console.WriteLine(ex.Message.ToString());// 异常信息
            }
        }
    }
}