/************************************************************

 ServerForm.cs
 CopyRight 2000-2001
 This is a sample program made by Saurabh Nandu.
 E-mail: saurabh@mastercsharp.com
 Website: http://www.mastercsharp.com
 Socket Chat
Compilation:
csc /t:winexe /out:..\ChatServer.exe ServerForm.cs Client.cs

11/September/2001
************************************************************/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;
using System.Net;
using System.Net.Sockets;

namespace SocketServer
{
	//Public delegate
	public delegate void LogUpdater(string msg);
	
	public class Form1 : System.Windows.Forms.Form
	{
		//Private Variables
		private System.Windows.Forms.ListBox logBox;
		private Thread serverThread;
		private TcpListener serverListener;
		private Hashtable clientTable;
		
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			InitializeComponent();
			clientTable = new Hashtable();
			//Start a thread on the startListen method
			serverThread = new Thread(new ThreadStart(startListen));
			serverThread.Start();
			AddLog("Socket Server Started");
		}

		public void startListen()
		{
			try
			{
				//Start the tcpListner
				serverListener = new TcpListener(5151);
				serverListener.Start();
				do
				{
					//Create a new class when a new Chat Client connects
					Client newClient = new Client(serverListener.AcceptTcpClient());
					//Attach the Delegates
					newClient.Disconnected+= new DisconnectDelegate(OnDisconnected);
					newClient.Connected+=new ConnectDelegate(this.OnConnected);
					newClient.MessageReceived+=new MessageDelegate(OnMessageReceived);
					//Connect to the clients
					newClient.Connect();
				}
				while(true);
			}
			catch
			{
				serverListener.Stop();
			}
		}

		//EvntsHandler fo the Connected event
		public void OnConnected(object sender, EventArgs e)
		{
			//Get the client that raised the vent
			Client temp = (Client)sender;
			//Add the client to the Hashtable
			clientTable.Add(temp.ID,temp);
			Client tempClient;
			AddLog("Client Connected:"+temp.UserName);
			//loop through each client and announce the 
			//client connected
			foreach(DictionaryEntry d in clientTable)
			{
				tempClient =(Client)d.Value;
				tempClient.Send(tempClient.ID+"@Connected@"+temp.UserName);
			}
		}

		public void OnDisconnected(object sender, EventArgs e)
		{
			//Get the Client that raised the Event
			Client temp =(Client)sender;
			//If the Client exists in the Hashtable
			if(clientTable.ContainsKey(temp.ID))
			{
				AddLog("Client Disconnected:"+temp.UserName);
				//Remove the client from the hashtable
				clientTable.Remove(temp.ID);
				//Remove the client from the ClientList class
				ClientList.RemoveClient(temp.UserName,temp.ID);
				Client tempClient;
				//Announce to all the existing clients
				foreach(DictionaryEntry d in clientTable)
				{
					tempClient =(Client)d.Value;
					tempClient.Send(tempClient.ID+"@Disconnected@"+temp.UserName);
				}
			}
		}

		public void OnMessageReceived(object sender, MessageEventArgs e)
		{
			//Message sender client
			Client temp = (Client)sender;
			AddLog(temp.UserName+" :"+e.Message);
			Client tempClient;
			//Send the message to each client
			foreach(DictionaryEntry d in clientTable)
			{
				tempClient =(Client)d.Value;
				tempClient.Send(temp.UserName+" :"+e.Message);
			}
		}
		//Method to add the string to the server log
		public void AddLog(string msg)
		{
			logBox.Items.Add(msg);
		}
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					if(serverListener!=null)
						serverListener.Stop();
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 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.logBox = new System.Windows.Forms.ListBox();
			this.SuspendLayout();
			// 
			// logBox
			// 
			this.logBox.Dock = System.Windows.Forms.DockStyle.Fill;
			this.logBox.Name = "logBox";
			this.logBox.Size = new System.Drawing.Size(368, 368);
			this.logBox.TabIndex = 0;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(368, 373);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.logBox});
			this.Name = "Form1";
			this.Text = "Socket Server";
			this.Closing += new System.ComponentModel.CancelEventHandler(this.Form1_Closing);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			serverListener.Stop();
		}
	}
}