/*
 * FTP on the Web. This sample demonstrates the use of the PowerTCP Ftp Tool
 * in the .Net environment. A user can log in, see a file listing, and have a 
 * file displayed in a textbox.
 * 
 */
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace Ftp
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label lblHost;
		protected System.Web.UI.WebControls.Label lblTitle1;
		protected System.Web.UI.WebControls.Label lblUser;
		protected System.Web.UI.WebControls.TextBox txtUser;
		protected System.Web.UI.WebControls.Label lblPass;
		protected System.Web.UI.WebControls.TextBox txtPass;
		protected System.Web.UI.WebControls.Button cmdLogin;
		protected System.Web.UI.WebControls.TextBox txtHost;
		protected System.Web.UI.WebControls.ListBox lstHistory;
		protected System.Web.UI.WebControls.Label Label2;
		protected System.Web.UI.WebControls.Label lblFileList;
		protected System.Web.UI.WebControls.Label lblFile;
		protected System.Web.UI.WebControls.Button cmdGetFile;
		protected System.Web.UI.WebControls.Button cmdRefresh;
		protected System.Web.UI.WebControls.TextBox txtFile;
		protected System.Web.UI.WebControls.ListBox lstFileList;

		protected DartFtpDotnet.Ftp Ftp1 = new DartFtpDotnet.Ftp(); // declaration of Ftp component
		
		// arraylist to hold history of ftp interaction with server, this will be bound to the display listbox
		protected System.Collections.ArrayList ArrListHistory = new System.Collections.ArrayList();
		protected System.Web.UI.WebControls.Button cmdEndSession;

		// arraylist to hold listing of files retrieved from server, this will be bound to the file listing listbox
		protected System.Collections.ArrayList ArrListListing = new System.Collections.ArrayList();


		
		

		public WebForm1()
		{
			Page.Init += new System.EventHandler(Page_Init);
		}

		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
		}

		private void Page_Init(object sender, EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();

			// initialize listHistory
			ArrListHistory.Add("No info yet, please login");
			lstHistory.DataSource = ArrListHistory;
			lstHistory.DataBind();
		}

		#region Web Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.cmdLogin.Click += new System.EventHandler(this.cmdLogin_Click);
			this.cmdEndSession.Click += new System.EventHandler(this.cmdEndSession_Click);
			this.cmdGetFile.Click += new System.EventHandler(this.cmdGetFile_Click);
			this.cmdRefresh.Click += new System.EventHandler(this.cmdRefresh_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void cmdLogin_Click(object sender, System.EventArgs e)
		{
			// variables to hold user login info, these will be saved as
			// session variables and will be updated every time login is clicked
			string FtpHost;
			string FtpUser;
			string FtpPass;

			FtpHost = txtHost.Text;
			FtpUser = txtUser.Text;
			FtpPass = txtPass.Text;

			// save login info to session variables
			Session["FtpHost"] = FtpHost;
			Session["FtpUser"] = FtpUser;
			Session["FtpPass"] = FtpPass;

			// clear history 
			ArrListHistory.Clear();
			Ftp1.TimeOut = 10000;

			if(Login())
			{
				// logged in, retrieve a file list and logout
				RetrieveFileList(true);
				Logout();
			}
				// bind results to history listbox
				lstHistory.DataSource = ArrListHistory;
				lstHistory.DataBind();
		

		}
		
		private void Logout()
		{
			ArrListHistory.Add("Attempting to Logout of " + Ftp1.RemoteAddress.ToString() + ":" + Ftp1.RemotePort.ToString());
			Ftp1.Logout();
			ArrListHistory.Add("Logged out");
		}

		private bool Login()
		{
			Ftp1.TimeOut = 10000;
			try
			{
				ArrListHistory.Add("Attempting to Login");
				// log in using session variables
				Ftp1.Login(Session["FtpHost"].ToString(), Session["FtpUser"].ToString(), Session["FtpPass"].ToString(), "", 21);
				ArrListHistory.Add("Logged into " + Ftp1.RemoteAddress.ToString() + ":" + Ftp1.RemotePort.ToString());
				return true;
			}
			catch(Exception LoginError)
			{
				// bad login, display error
				ArrListHistory.Add("Error Logging In");
				ArrListHistory.Add(LoginError.Message);
				return false;
			}
		}

		private void RetrieveFileList(bool loggedin)
		{
			
			bool blnLoggedIn = loggedin;
			if(!loggedin)
			{
				// not logged in so login. This would be the case if
				// refresh is called.
				blnLoggedIn = Login();
			}
			if(blnLoggedIn)
			{
				// now everyone is logged in so let's proceed
				ArrListHistory.Add("Retrieving Listing");
				try
				{
					// send list command
					Ftp1.List("-lr");

					// iterate through list and add file info to array
					// this will be bound later to the file listing listbox
					// add a colon after filename to parse out later
					for(int i=0; i< Ftp1.Listing.Count; i++)
						ArrListListing.Add(Ftp1.Listing.Item(i+1).Name + ":" + Ftp1.Listing.Item(i+1).Text);
					lblFileList.Enabled = true;
					lstFileList.Enabled = true;
					cmdGetFile.Enabled = true;
					cmdRefresh.Enabled = true;
					cmdLogin.Enabled = false;
					cmdEndSession.Enabled = true;
					lblHost.Enabled = false;
					lblUser.Enabled = false;
					lblPass.Enabled = false;
					txtHost.Enabled = false;
					txtUser.Enabled = false;
					txtPass.Enabled = false;

					// bind file listing
					lstFileList.DataSource = ArrListListing;
					lstFileList.DataBind();
				}
				catch(Exception ListError)
				{
					ArrListHistory.Add("Error Retrieving List");
					ArrListHistory.Add(ListError.Message);
				}
			}

			
		}

		private void cmdGetFile_Click(object sender, System.EventArgs e)
		{
			ArrListHistory.Clear();
			Object obj = new object();
			string temp = "";
			string filename;

			// parse filename out of selected item in listbox
			filename = ParseFile(lstFileList.SelectedItem.Text);
			
			obj = temp;

			if(Login())
			{
				try
				{
					ArrListHistory.Add("Attempting to retrieve " + filename);
					// login successful, retrieve file and place results in obj
					Ftp1.Retrieve(filename, ref obj, 0);
					ArrListHistory.Add(filename + " successfully retrieved");
					txtFile.Visible = true;
					lblFile.Visible = true;
					// display obj in textbox and logout
					txtFile.Text = obj.ToString();
					ArrListHistory.Add("Attempting to logout");
					Ftp1.Logout();
					ArrListHistory.Add("Logged out");
				}
				catch(Exception RetrieveError)
				{
					ArrListHistory.Add("Error retrieving file");
					ArrListHistory.Add(RetrieveError.Message);
				}
			}
			lstHistory.DataSource = ArrListHistory;
			lstHistory.DataBind();
		}

		private string ParseFile(string stringIn)
		{
			int colon;
			string temp;
			// find colon we added earlier and strip all data from the
			// left side (the filename)
			colon = stringIn.IndexOf(":", 0, stringIn.Length);
			temp = stringIn.Substring(0, colon);
			return temp;

		}
		private void cmdRefresh_Click(object sender, System.EventArgs e)
		{
			// refresh file list by simply retrieving a new one
			ArrListHistory.Clear();
			RetrieveFileList(false);
			txtFile.Text = "";
			Logout();
			lstHistory.DataSource = ArrListHistory;
			lstHistory.DataBind();
		}

		private void cmdEndSession_Click(object sender, System.EventArgs e)
		{
			// since we are not really logged into the ftp server, it isn't 
			// necessary to log out. This button clears the session variables
			// and allows login under a different username.
			ArrListHistory.Clear();
			ArrListHistory.Add("Ending session for " + Session["FtpUser"].ToString());
			Session["FtpHost"] = "";
			Session["FtpUser"] = "";
			Session["FtpPass"] = "";
			cmdLogin.Enabled = true;
			cmdEndSession.Enabled = false;
			lblHost.Enabled = true;
			lblPass.Enabled = true;
			lblUser.Enabled = true;
			txtHost.Enabled = true;
			txtPass.Enabled = true;
			txtUser.Enabled = true;

			lblFileList.Enabled = false;
			lstFileList.DataSource = "";
			lstFileList.DataBind();
			cmdGetFile.Enabled = false;
			cmdRefresh.Enabled = false;
			lblFile.Visible = false;
			txtFile.Visible = false;
			
			ArrListHistory.Add("End Session successful");
			ArrListHistory.Add("Please Login or quit");
			lstHistory.DataSource = ArrListHistory;
			lstHistory.DataBind();
		}
	}

}