import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;
public class Server extends JFrame{
	JTextArea textArea = null;
	LinkedList list = null;
	ServerSocket server = null;
	final int PORT = 2000;
	public Server(){
		super();
		textArea = new JTextArea();
		textArea.setEditable(false);
		getContentPane().add(new JScrollPane(textArea), BorderLayout.CENTER);
		addWindowListener(new CloseListener());
		setSize(500, 200);
		show();
		startServer();
	}
	public void startServer(){
		list = new LinkedList();
		updateTitle();
		try{
			server = new ServerSocket(PORT,5);
			while (true){
				Socket connection = server.accept();
				broadCast("CLIENT CONNECTED: " + 
					connection.getInetAddress().getHostName(), connection.getInetAddress().getHostName());
				ClientHandler handler = new ClientHandler(connection, this);
				handler.start();
				list.add(handler);
				updateTitle();
			}
		}catch(IOException ioe){
		}
	}
	public synchronized void broadCast(String msg, String sender){
		Iterator iter = list.iterator();
		while (iter.hasNext()){
			((ClientHandler)iter.next()).sendMsgToClient(msg);
		}
		textArea.append("CLIENT: " + sender + " BROADCAST: " + msg + "\n");
		textArea.setCaretPosition(textArea.getText().length());
	}
	public void updateTitle(){
		try{
			setTitle("SERVER ON: " + 
				InetAddress.getLocalHost().getHostName() + 
				" - PORT: " + PORT + " - CLIENTS: " + 
				list.size());
		}catch(UnknownHostException uhe){
		}
	}
	public class CloseListener extends WindowAdapter{
		public void windowClosing(WindowEvent e){
			try{
				server.close();
			}catch(IOException ioe){
			}
			System.exit(0);
		}
	}
	public static void main (String[] args) throws Exception{
		new Server();
	}
}