using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Threading;
using Models;
using Microsoft.AspNetCore.Http;

namespace COMMON
{
    /// <summary>
    /// ftp 帮助类
    /// </summary>
    public static class FtpHelper
    {
        //基本设置
        static private string path => ConfigEntity.Instance.FTPPATH;    //目标路径
        static private string ftpip => ConfigEntity.Instance.FTPIP;    //ftp IP地址
        static private string username => ConfigEntity.Instance.FTPUSERNAME;   //ftp用户名
        static private string password => ConfigEntity.Instance.FTPPASSWORD;    //ftp密码

        /// <summary>
        /// 获取ftp上面的文件和文件夹
        /// </summary>
        /// <param name="dir"></param>
        /// <returns></returns>
        public static string[] GetFileList(string dir)
        {
            StringBuilder result = new StringBuilder();
            FtpWebRequest request;
          
               request = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpip + Path.Combine(path, dir)));
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(username, password);//设置用户名和密码
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                request.UseBinary = true;

                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();
                }
                // to remove the trailing '\n'
                result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
           
        }

        /// <summary>
        /// 获取文件大小
        /// </summary>
        /// <param name="file">ip服务器下的相对路径</param>
        /// <returns>文件大小</returns>
        public static int GetFileSize(string file)
        {
            try
            {


            StringBuilder result = new StringBuilder();
            FtpWebRequest request;
           
                string URL = ftpip + path +file.Replace("\\", "/");
                request = (FtpWebRequest)FtpWebRequest.Create(new Uri(URL));
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(username, password);//设置用户名和密码
                request.Method = WebRequestMethods.Ftp.GetFileSize;

                int dataLength = (int)request.GetResponse().ContentLength;

                return dataLength;
            }
            catch (Exception)
            {
                return -1;
            }

        }


        /// <summary>
        /// 文件上传
        /// </summary>
        /// <param name="objPath">目标文件夹：服务器下的相对路径 不填为根目录</param>
        /// <param name="fs">目标文件夹：服务器下的相对路径 不填为根目录</param>
        /// <param name="newname">目标文件夹：服务器下的相对路径 不填为根目录</param>
        public static bool FileUpLoad(FileStream fs, string newname, string objPath = "")
        {
                string url = ftpip + path;
                if (objPath != "")
                    url += objPath + "/";
                try
                {
                    FtpWebRequest reqFTP = null;
                    //待上传的文件 （全路径）
                    try
                    {
                        using (fs)
                        {
                            long length = fs.Length;
                            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url + newname));

                            //设置连接到FTP的帐号密码
                            reqFTP.Credentials = new NetworkCredential(username, password);
                            //设置请求完成后是否保持连接
                            reqFTP.KeepAlive = false;
                            //指定执行命令
                            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                            //指定数据传输类型
                            reqFTP.UseBinary = true;

                            using (Stream stream = reqFTP.GetRequestStream())
                            {
                                //设置缓冲大小
                                int BufferLength = 5120;
                                byte[] b = new byte[BufferLength];
                                int i;
                                while ((i = fs.Read(b, 0, BufferLength)) > 0)
                                {
                                    stream.Write(b, 0, i);
                                }
                                Console.WriteLine("上传文件成功");
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine("上传文件失败错误为" + ex.Message);
                        return false;
                    }
                    finally
                    {

                    }
                }
                catch (Exception ex)
                {

                    Console.WriteLine("上传文件失败错误为" + ex.Message);
                    return false;

                }
                finally
                {

                }
           
            return true;


        }



        /// <summary>
        /// 文件上传
        /// </summary>
        /// <param name="filePath">原路径（绝对路径）包括文件名</param>
        /// <param name="objPath">目标文件夹：服务器下的相对路径 不填为根目录</param>
        /// <param name="newname">目标文件夹：服务器下的相对路径 不填为根目录</param>
        public static bool FileUpLoad(string filePath,string newname, string objPath = "")
        {
                string url = ftpip + path;
                if (objPath != "")
                    url += objPath + "/";
               
                    FtpWebRequest reqFTP = null;
                    //待上传的文件 （全路径）
                   
                        FileInfo fileInfo = new FileInfo(filePath);
                        using (FileStream fs = fileInfo.OpenRead())
                        {
                            long length = fs.Length;
                            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url + newname));

                            //设置连接到FTP的帐号密码
                            reqFTP.Credentials = new NetworkCredential(username, password);
                            //设置请求完成后是否保持连接
                            reqFTP.KeepAlive = false;
                            //指定执行命令
                            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                            //指定数据传输类型
                            reqFTP.UseBinary = true;

                            using (Stream stream = reqFTP.GetRequestStream())
                            {
                                //设置缓冲大小
                                int BufferLength = 5120;
                                byte[] b = new byte[BufferLength];
                                int i;
                                while ((i = fs.Read(b, 0, BufferLength)) > 0)
                                {
                                    stream.Write(b, 0, i);
                                }
                                Console.WriteLine("上传文件成功");
                            }
                        }
            return true;

        }

        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="fileName">服务器下的相对路径 包括文件名</param>
        public static bool DeleteFileName(string fileName)
        {
                string URL = ftpip + path+ fileName.Replace("\\", "/");
                FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(URL));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(username, password);
                // 默认为true，连接不会被关闭
                // 在一个命令之后被执行
                reqFTP.KeepAlive = false;
                // 指定执行什么命令
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
                return true;
        }

        /// <summary>
        /// 新建目录 上一级必须先存在
        /// </summary>
        /// <param name="dirName">服务器下的相对路径</param>
        public static void MakeDir(string dirName)
        {
            
                FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpip +path+dirName));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(username, password);
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
        }

        /// <summary>
        /// 删除目录 上一级必须先存在
        /// </summary>
        /// <param name="dirName">服务器下的相对路径</param>
        public static void DelDir(string dirName)
        {
           
                FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpip + Path.Combine(path, dirName)));
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(username, password);
                reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
        }

        /// <summary>
        /// 从ftp服务器上获得文件夹列表
        /// </summary>
        /// <param name="RequedstPath">服务器下的相对路径</param>
        /// <returns></returns>
        public static List<string> GetDirctory(string RequedstPath)
        {
            List<string> strs = new List<string>();
           
                
                FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpip + Path.Combine(path, RequedstPath)));
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(username, password);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (line.Contains("<DIR>"))
                    {
                        string msg = line.Substring(line.LastIndexOf("<DIR>") + 5).Trim();
                        strs.Add(msg);
                    }
                    line = reader.ReadLine();
                }
                reader.Close();
                response.Close();
                return strs;
        }

        /// <summary>
        /// 从ftp服务器上获得文件列表
        /// </summary>
        /// <param name="RequedstPath">服务器下的相对路径</param>
        /// <returns></returns>
        public static List<string> GetFile(string RequedstPath)
        {
            List<string> strs = new List<string>();
            
                FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpip + Path.Combine(path, RequedstPath)));
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(username, password);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (!line.Contains("<DIR>"))
                    {
                        string msg = line.Substring(39).Trim();
                        strs.Add(msg);
                    }
                    line = reader.ReadLine();
                }
                reader.Close();
                response.Close();
                return strs;
        }

    }
}