A Simple Multi-Threaded Server Client Instant Messenger Application

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Net;
using System.Net.Sockets;
using System.Threading;

using ChatMessage = ChatLibrary.Message;

namespace Client
{
	public class ClientWindow : System.Windows.Forms.Form
	{
		private System.Windows.Forms.TextBox txtMessages;
		private System.Windows.Forms.Button btnSend;
		private System.Windows.Forms.TextBox txtSend;

		private System.ComponentModel.Container components = null;


		public ClientWindow()
		{
			InitializeComponent();

		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					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.txtMessages = new System.Windows.Forms.TextBox();
			this.btnSend = new System.Windows.Forms.Button();
			this.txtSend = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// txtMessages
			// 
			this.txtMessages.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
				| System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right)));
			this.txtMessages.BackColor = System.Drawing.Color.White;
			this.txtMessages.Location = new System.Drawing.Point(8, 8);
			this.txtMessages.Multiline = true;
			this.txtMessages.Name = "txtMessages";
			this.txtMessages.ReadOnly = true;
			this.txtMessages.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.txtMessages.Size = new System.Drawing.Size(344, 152);
			this.txtMessages.TabIndex = 0;
			this.txtMessages.Text = "";
			this.txtMessages.TextChanged += new System.EventHandler(this.txtMessages_TextChanged);
			// 
			// btnSend
			// 
			this.btnSend.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
			this.btnSend.Enabled = false;
			this.btnSend.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.btnSend.Location = new System.Drawing.Point(296, 168);
			this.btnSend.Name = "btnSend";
			this.btnSend.Size = new System.Drawing.Size(56, 40);
			this.btnSend.TabIndex = 2;
			this.btnSend.Text = "Send";
			this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
			// 
			// txtSend
			// 
			this.txtSend.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right)));
			this.txtSend.Location = new System.Drawing.Point(8, 168);
			this.txtSend.Multiline = true;
			this.txtSend.Name = "txtSend";
			this.txtSend.Size = new System.Drawing.Size(280, 40);
			this.txtSend.TabIndex = 1;
			this.txtSend.Text = "";
			this.txtSend.TextChanged += new System.EventHandler(this.txtSend_TextChanged);
			// 
			// ClientWindow
			// 
			this.AcceptButton = this.btnSend;
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
			this.ClientSize = new System.Drawing.Size(360, 213);
			this.Controls.Add(this.txtSend);
			this.Controls.Add(this.txtMessages);
			this.Controls.Add(this.btnSend);
			this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.Name = "ClientWindow";
			this.Text = "Client";
			this.Load += new System.EventHandler(this.ClientForm_Load);
			this.ResumeLayout(false);

		}
		#endregion

		private void btnSend_Click(object sender, System.EventArgs e)
		{
			

			ChatMessage sendMessage		= new ChatLibrary.Message();
			sendMessage.Sender			= ClientLibrary.mainMessenger.clientSocket.Name;
			sendMessage.Receiver		
				=  this.Text.Equals(ChatLibrary.Common.Conference)? ChatLibrary.Common.All : this.Text;
			sendMessage.MessageCommand	
				= this.Text.Equals(ChatLibrary.Common.Conference)? ChatLibrary.Command.Conference: ChatLibrary.Command.PersonalMessage;
			sendMessage.MessageDetail	= txtSend.Text;

			ClientLibrary.mainMessenger.clientSocket.SendMessage(sendMessage);
			if (!this.Text.Equals(ChatLibrary.Common.Conference))
			{
				WriteMessage(sendMessage);
			}
			txtSend.Clear();
			txtSend.Focus();
		}

		private void clientSocket_MessageReceived(object sender, ChatLibrary.Message receivedMessage)
		{
			if (receivedMessage.MessageCommand.Equals(ChatLibrary.Command.PersonalMessage))
			{
				WriteMessage(receivedMessage);
			}
			if (receivedMessage.MessageCommand.Equals(ChatLibrary.Command.Logout))
			{
                ClientLibrary.mainMessenger.clientSocket.Stop();
			}
		}

		public string WriteMessage (ChatMessage receivedMessage)
		{
			string strWriteMessage = string.Empty;
			if (receivedMessage.MessageDetail.StartsWith("\r\n") ) // ang daya mo!
			{
				strWriteMessage =	string.Format("{0}", receivedMessage.MessageDetail);
			}
			else
			{
				strWriteMessage =	string.Format("\r\n{0} {1}: {2}", GetTime(), receivedMessage.Sender,  receivedMessage.MessageDetail);
			}

			txtMessages.Text += strWriteMessage;
			return strWriteMessage;
		}

		private string GetTime ()
		{
			return DateTime.Now.Hour + ":" +DateTime.Now.Minute + ":" + DateTime.Now.Second;

		}

		private void txtSend_TextChanged(object sender, System.EventArgs e)
		{
			
			btnSend.Enabled = (!txtSend.Text.Equals(string.Empty) && ClientLibrary.mainMessenger.clientSocket != null )
				?true: false;
		}

		private void ClientForm_Load(object sender, System.EventArgs e)
		{
		
		}

		private void txtMessages_TextChanged(object sender, System.EventArgs e)
		{
			txtMessages.SelectionStart = txtMessages.Text.Length;
			txtMessages.ScrollToCaret();
			txtSend.Focus();
		}
	}

	class ClientLibrary 
	{
		internal static MessengerForm  mainMessenger; 
	}

}