using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Web.UI.WebControls;
using System.IO;
using System.Text.RegularExpressions;


namespace UploadFileOnServer
{
    public class UploadFileClass
    {
        private static string GetValidFileName(string fileName)
        {
            // remove any invalid character from the filename.
            return Regex.Replace(fileName.Trim(), "[^A-Za-z0-9_ ]+", "");
        }
        public string UploadFile(FileUpload FU, string FolderID)
        {

            string[] validFileTypes = { "bmp", "gif", "png", "jpg", "jpeg", "doc", "docx", "xls", "xlsx", "pdf", "rar", "zip", "ppt" };
            string ext = System.IO.Path.GetExtension(FU.PostedFile.FileName).ToLower();
            bool isValidFile = false;
            for (int i = 0; i < validFileTypes.Length; i++)
            {
                if (ext == "." + validFileTypes[i])
                {
                    isValidFile = true;
                    break;
                }
            }
            if (!isValidFile)
            {
                return "0";

            }
            else
            {
                string namefile = System.IO.Path.GetFileNameWithoutExtension(FU.FileName);
                string file_name = GetValidFileName(namefile);
                string remoteFilename = file_name + ext;

                string ftpUserName = System.Configuration.ConfigurationManager.AppSettings["FTP_UserName"].ToString();
                string ftpPassword = System.Configuration.ConfigurationManager.AppSettings["FTP_Password"].ToString();
                string FTP_Path = System.Configuration.ConfigurationManager.AppSettings["FTP_Path"].ToString();
                string HTTP_Path = System.Configuration.ConfigurationManager.AppSettings["HTTP_Path"].ToString();

                FtpWebResponse CreateFolderResponse;
                try
                {

                    //fname = ContentUpload.FileName;
                    string ftpfullpath = FTP_Path + FolderID + "/";

                    //Create the folder, Please notice if the WPF folder already exist, it will result 550 error.

                    FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpfullpath);
                    ftp.Credentials = new NetworkCredential(ftpUserName, ftpPassword);

                    ftp.Method = WebRequestMethods.Ftp.MakeDirectory;
                    CreateFolderResponse = (FtpWebResponse)ftp.GetResponse();
                    if (CreateFolderResponse.StatusCode == FtpStatusCode.PathnameCreated)
                    {
                        string uri = FTP_Path + FolderID + "/" + remoteFilename;
                        FtpWebRequest reqFTP;
                        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                        reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
                        reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                        reqFTP.KeepAlive = false;
                        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                        reqFTP.UseBinary = true;
                        reqFTP.ContentLength = FU.PostedFile.ContentLength;

                        Stream OutputStream = reqFTP.GetRequestStream();

                        int buffLength = 2048000;
                        byte[] buff = new byte[buffLength];
                        int contentLen = (int)FU.PostedFile.InputStream.Length;

                        Stream InputStream = FU.PostedFile.InputStream;

                        contentLen = InputStream.Read(buff, 0, buffLength);

                        while (contentLen != 0)
                        {
                            OutputStream.Write(buff, 0, contentLen);

                            contentLen = InputStream.Read(buff, 0, buffLength);
                        }
                        InputStream.Close();
                        OutputStream.Close();
                    }
                }
                catch
                {
                    try
                    {
                        string uri = FTP_Path + FolderID + "/" + remoteFilename;
                        FtpWebRequest reqFTP;
                        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                        reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
                        reqFTP.KeepAlive = false;
                        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                        reqFTP.UseBinary = true;
                        reqFTP.ContentLength = FU.PostedFile.ContentLength;

                        Stream OutputStream = reqFTP.GetRequestStream();

                        int buffLength = 2048000;
                        byte[] buff = new byte[buffLength];
                        int contentLen = (int)FU.PostedFile.InputStream.Length;

                        Stream InputStream = FU.PostedFile.InputStream;

                        contentLen = InputStream.Read(buff, 0, buffLength);

                        while (contentLen != 0)
                        {
                            OutputStream.Write(buff, 0, contentLen);

                            contentLen = InputStream.Read(buff, 0, buffLength);
                        }
                        InputStream.Close();
                        OutputStream.Close();
                    }
                    catch
                    {
                    }
                }

                return remoteFilename;
            }

        }
    }

}