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

namespace FTP.Models
{
    public class FTPConnectModel : NotifyBase
    {
        #region
        private string ip;
        /// <summary>
        /// IP
        /// </summary>
        public string IP
        {
            get { return ip; }
            set { ip = value; this.DoNotify(); }
        }

        private int port;
        /// <summary>
        /// 端口
        /// </summary>
        public int Port
        {
            get { return port; }
            set { port = value; this.DoNotify(); }
        }

        private string username;
        /// <summary>
        /// 用户名
        /// </summary>
        public string UserName
        {
            get { return username; }
            set { username = value; this.DoNotify(); }
        }

        private string password;
        /// <summary>
        /// 密码
        /// </summary>
        public string PassWord
        {
            get { return password; }
            set { password = value; this.DoNotify(); }
        }



        public string ftpRemotePath;        //FTP目标目录
        public string Ipath;                //目标文件存放路径

        private string frpurl;

        public string ftpURI  //得到的FTPUrL
        {
            get { return frpurl; }
            set { frpurl = value; this.DoNotify(); }
        }
        public string ftpUrls;              //得到相对的Url
        #endregion
        /// <summary>
        /// FTP请求对象
        /// </summary>
        FtpWebRequest request = null;
        /// <summary>
        /// FTP响应对象
        /// </summary>
        FtpWebResponse response = null;
        /// <summary>
        /// 文件目录
        /// </summary>
        List<FileMode> fileLists = new List<FileMode>();
        /// <summary>
        /// 多个消息实体
        /// </summary>
        List<OperationResult> operationResults = new List<OperationResult>();
        /// <summary>
        /// 单个消息实体
        /// </summary>
        OperationResult operationResult = new OperationResult();
        #region FTP初始化
        /// <summary>
        /// 获取FTP的URL
        /// </summary>
        /// <param name="ftpServerIP"></param>
        /// <param name="ftpServerPort"></param>
        /// <param name="ftpRemotePath"></param>
        /// <param name="ftpUserID"></param>
        /// <param name="ftpPassword"></param>
        /// <param name="Ipath"></param>
        public string getFtpHelper(string ftpServerIP, int ftpServerPort, string ftpRemotePath, string ftpUserID, string ftpPassword, string Ipath)
        {
            this.IP = ftpServerIP;
            this.ftpRemotePath = ftpRemotePath;
            this.port = ftpServerPort;
            this.Ipath = Ipath;
            this.UserName = ftpUserID;
            this.PassWord = ftpPassword;
            this.ftpUrls = "ftp://" + ftpServerIP + ":" + ftpServerPort + "/";
            this.ftpURI = "ftp://" + ftpServerIP + ":" + ftpServerPort + "/" + (string.IsNullOrEmpty(ftpRemotePath) ? "" : ftpRemotePath);
            return ftpURI;
        }

        /// <summary>
        /// 建立FTP链接,返回响应对象
        /// </summary>
        /// <param name="uri">FTP地址</param>
        /// <param name="ftpMethod">操作命令</param>
        /// <returns></returns>
        private FtpWebResponse Open(Uri uri, string ftpMethod)
        {
            request = (FtpWebRequest)FtpWebRequest.Create(uri);
            request.Method = ftpMethod;
            request.UseBinary = true;
            request.KeepAlive = false;
            request.Credentials = new NetworkCredential(this.UserName, this.PassWord);
            return (FtpWebResponse)request.GetResponse();
        }

        /// <summary>       
        /// 建立FTP链接,返回请求对象       
        /// </summary>      
        /// <param name="uri">FTP地址</param>       
        /// <param name="ftpMethod">操作命令</param>       
        private FtpWebRequest OpenRequest(Uri uri, string ftpMethod)
        {
            request = (FtpWebRequest)WebRequest.Create(uri);
            request.Method = ftpMethod;
            request.UseBinary = true;
            request.KeepAlive = false;
            request.Credentials = new NetworkCredential(this.UserName, this.PassWord);
            return request;
        }

        /// <summary>       
        /// 建立FTP链接,返回请求对象       
        /// </summary>      
        /// <param name="uri">FTP地址</param>       
        /// <param name="ftpMethod">操作命令</param>       
        private FtpWebRequest FTPRequest(Uri uri, string ftpMethod)
        {
            request = (FtpWebRequest)WebRequest.Create(uri);
            request.Method = ftpMethod;
            request.UseBinary = true;
            request.KeepAlive = false;
            request.Credentials = new NetworkCredential(UserName, PassWord);
            return request;
        }

        /// <summary>
        /// 建立FTP链接,返回响应对象
        /// </summary>
        /// <param name="uri">请求的URL</param>
        /// <param name="ftpMethod">请求的方法</param>
        /// <returns></returns>
        private FtpWebResponse FTPResponse(Uri uri, string ftpMethod)
        {
            request = (FtpWebRequest)FtpWebRequest.Create(uri);
            request.Method = ftpMethod;
            request.UseBinary = true;
            request.KeepAlive = false;                                          //保持接,其他方法关闭
            request.Credentials = new NetworkCredential(UserName, PassWord);
            return (FtpWebResponse)request.GetResponse();
        }

        /// <summary>       
        /// 析构函数关闭连接，如果不了解析构函数，可以去网上查找C#析构函数    
        /// </summary>           
        ~FTPConnectModel()
        {
            if (response != null)
            {
                response.Close();
                response = null;
            }
            if (request != null)
            {
                request.Abort();
                request = null;
            }
        }
        #endregion

        #region 列出当前目录的所有一级子目录
        /// <summary>       
        /// 列出当前目录的所有一级子目录       
        /// </summary>       
        public List<FTPModel> ListDirectories()
        {
            var listAll = ListFilesAndDirectories();
            var listFile = listAll.Where(m => m.IsDirectory == true).ToList();
            return listFile;
        }

        /// <summary>       
        /// 列出当前目录的所有文件       
        /// </summary>       
        public List<FTPModel> ListFiles()
        {
            var listAll = ListFilesAndDirectories();
            var listFile = listAll.Where(m => m.IsDirectory == false).ToList();
            return listFile;
        }

        #endregion

        #region 获取当前目录的一级子目录和文件信息
        public static Regex FtpListDirectoryDetailsRegex = new Regex(@".*(?<month>(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\s*(?<day>[0-9]*)\s*(?<yearTime>([0-9]|:)*)\s*(?<fileName>.*)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
        /// <summary>
        /// 获取当前目录一级字目录和文件信息
        /// </summary>
        /// <param name="IsOnlyDir">是否只获取目录</param>
        /// <returns></returns>
        public List<FTPModel> ListFilesAndDirectories()
        {
            var fileList = new List<FTPModel>();
            response = FTPResponse(new Uri(ftpURI), WebRequestMethods.Ftp.ListDirectoryDetails);
            using (var stream = response.GetResponseStream())
            {
                using (var sr = new StreamReader(stream))
                {
                    string line = null;
                    while ((line = sr.ReadLine()) != null)
                    {
                        Match match = FtpListDirectoryDetailsRegex.Match(line);
                        //string[] a = line.Split(' ');
                        string month = match.Groups["month"].Value;

                        string day = match.Groups["day"].Value;
                        string yearTime = match.Groups["yearTime"].Value;
                        string fileName = match.Groups["fileName"].Value;
                        string fmsgTime = Convert.ToDateTime(DateTime.Now.ToString("yy") + month + day).ToString("yyyy-MM-dd") + " " + yearTime;
                        Console.WriteLine(line);
                        var model = new FTPModel()
                        {
                            CreateTime = Convert.ToDateTime(fmsgTime),
                            FileName = fileName,
                            FilePath = ftpRemotePath + "/" + fileName,
                            IsDirectory = true
                        };
                        if (line.StartsWith('d'))  //代表是文件夹
                        {
                            model.IsDirectory = true;
                        }
                        //else if (line.StartsWith('l'))
                        //{
                        //    //model.IsDirectory = null;
                        //}
                        else if (line.StartsWith('-') || line.StartsWith('l'))
                        {
                            model.IsDirectory = false;
                        }
                        fileList.Add(model);
                    }
                }
            }
            return fileList;
        }

        /// <summary>
        /// 下载
        /// </summary>
        /// <param name="saveFilePath">下载后的保存路径</param>
        /// <param name="downloadFileName">要下载的文件名</param>
        public void Download(string saveFilePath, string downloadFileName)
        {
            using (FileStream outputStream = new FileStream(saveFilePath + "\\" + downloadFileName, FileMode.Create))
            {
                response = Open(new Uri(ftpURI + downloadFileName), WebRequestMethods.Ftp.DownloadFile);
                using (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);
                    }
                }
            }
        }

        /// <summary>
        /// 文件上传
        /// </summary>
        /// <param name="localFilePath">本地文件路径</param>
        public void Upload(string localFilePath)
        {
            FileInfo fileInf = new FileInfo(localFilePath);
            request = OpenRequest(new Uri(ftpURI + fileInf.Name), WebRequestMethods.Ftp.UploadFile);
            request.ContentLength = fileInf.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            using (var fs = fileInf.OpenRead())
            {
                using (var strm = request.GetRequestStream())
                {
                    contentLen = fs.Read(buff, 0, buffLength);
                    while (contentLen != 0)
                    {
                        strm.Write(buff, 0, contentLen);
                        contentLen = fs.Read(buff, 0, buffLength);
                    }
                }
            }
        }

        /// <summary>  
        /// 删除文件  
        /// </summary>  
        /// <param name="remoteFileName">要删除的文件名</param>
        public void DeleteFile(string remoteFileName)
        {
            response = Open(new Uri(ftpURI + remoteFileName), WebRequestMethods.Ftp.DeleteFile);
        }

        /// <summary>
        /// 删除目录(包括下面所有子目录和子文件)
        /// </summary>
        /// <param name="remoteDirectoryName">要删除的带路径目录名：如web/test</param>
        /*
         * 例：删除test目录
         FTPHelper helper = new FTPHelper("x.x.x.x", "web", "user", "password");                  
         helper.RemoveDirectory("web/test");
         */
        public void RemoveDirectory(string remoteDirectoryName)
        {
            GotoDirectory(remoteDirectoryName, true);
            var listAll = ListFilesAndDirectories();
            foreach (var m in listAll)
            {
                if (m.IsDirectory)
                    RemoveDirectory(m.FilePath);
                else
                    DeleteFile(m.FileName);
            }
            GotoDirectory(remoteDirectoryName, true);
            response = Open(new Uri(ftpURI), WebRequestMethods.Ftp.RemoveDirectory);
        }
        /// <summary>  
        /// 切换当前目录  
        /// </summary>  
        /// <param name="IsRoot">true:绝对路径 false:相对路径</param>   
        public void GotoDirectory(string DirectoryName, bool IsRoot)
        {
            if (IsRoot)
                ftpRemotePath = DirectoryName;
            else
                ftpRemotePath += "/" + DirectoryName;

            ftpURI = "ftp://" + IP + "/" + ftpRemotePath + "/";
        }

        /// <summary>       
        /// 判断当前目录下指定的一级子目录是否存在       
        /// </summary>       
        /// <param name="RemoteDirectoryName">指定的目录名</param>      
        public bool IsDirectoryExist(string remoteDirectoryName)
        {
            var listDir = ListDirectories();
            if (listDir.Count(m => m.FileName == remoteDirectoryName) > 0)
                return true;
            return false;
        }
        /// <summary>       
        /// 判断当前目录下指定的子文件是否存在      
        /// </summary>       
        /// <param name="RemoteFileName">远程文件名</param>       
        public bool IsFileExist(string remoteFileName)
        {
            var listFile = ListFiles();
            if (listFile.Count(m => m.FileName == remoteFileName) > 0)
                return true;
            return false;
        }
        #endregion
    }
}