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

namespace SmartCoalApplication.Base.CommTool
{
    /// <summary>
    /// FPT帮助类
    /// </summary>
    public class FTPWebsiteHelper
    {
        /// <summary>
        /// FTP地址 地址 +路径
        /// </summary>
        public string ftpPath { get; set; }

        /// <summary>
        /// FTP账号
        /// </summary>
        public string ftpUserID { get; set; }

        /// <summary>
        /// FTP密码
        /// </summary>
        public string ftpPassword { get; set; }

        /// <summary>
        /// FTP密码
        /// </summary>
        public string ftpStr { get; set; }

        /// <summary>
        /// 创建文件夹
        /// </summary>
        /// <param name="localFile">要上传到FTP服务器的本地文件</param>
        /// <param name="ftpPath">FTP地址</param>
        public void CreateDictionary(string dateStr)
        {
            try
            {
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(ftpPath + "/" + dateStr);// 根据uri创建FtpWebRequest对象 
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);// ftp用户名和密码
                reqFTP.KeepAlive = false;// 默认为true，连接不会被关闭 // 在一个命令之后被执行
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;// 指定执行什么命令
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {

            }
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="localFile">要上传到FTP服务器的本地文件</param>
        /// <param name="ftpPath">FTP地址</param>
        public void UpLoadFile(string localFile)
        {
            if (!File.Exists(localFile))
            {
                return;
            }
            FileInfo fileInf = new FileInfo(localFile);
            FtpWebRequest reqFTP;

            string dateStr = DateTime.Now.ToString("yyyyMMdd");
            this.ftpStr = dateStr;

            CreateDictionary(dateStr);

            reqFTP = (FtpWebRequest)FtpWebRequest.Create(ftpPath + "/" + dateStr + "/" + fileInf.Name);// 根据uri创建FtpWebRequest对象 
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);// ftp用户名和密码
            reqFTP.KeepAlive = false;// 默认为true，连接不会被关闭 // 在一个命令之后被执行
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;// 指定执行什么命令
            reqFTP.UseBinary = true;// 指定数据传输类型
            reqFTP.ContentLength = fileInf.Length;// 上传文件时通知服务器文件的大小
            int buffLength = 2048;// 缓冲大小设置为2kb
            byte[] buff = new byte[buffLength];
            int contentLen;

            // 打开一个文件流 (System.IO.FileStream) 去读上传的文件
            FileStream fs = fileInf.OpenRead();
            try
            {
                Stream strm = reqFTP.GetRequestStream();// 把上传的文件写入流
                contentLen = fs.Read(buff, 0, buffLength);// 每次读文件流的2kb

                while (contentLen != 0)// 流内容没有结束
                {
                    // 把内容从file stream 写入 upload stream
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                // 关闭两个流
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
}