import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.net.*;
public class Client extends JFrame implements Runnable{
	private JTextField textField = null;
	private JTextArea textArea = null;
	private BufferedReader in = null;
	private PrintWriter out = null;
	private Socket socket = null;
	private static final String DEFAULT_HOST = "localhost";
	private static final int DEFAULT_PORT = 2000;
	public Client(String host, int port){
		super();
		textField = new JTextField();
		textArea = new JTextArea();
		textArea.setEditable(false);
		textField.addKeyListener(new ReturnListener());
		addWindowListener(new CloseListener());
		getContentPane().add(textField, BorderLayout.SOUTH);
		getContentPane().add(new JScrollPane(textArea), BorderLayout.CENTER);
		setSize(400, 200);
		show();
		makeConnection(host, port);
	}
	public void makeConnection(String host, int port){
		try{
			socket = new Socket(host, port);
			setTitle("CONNECTED TO: " + host + " - ON PORT: " + port);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new PrintWriter(socket.getOutputStream());
			(new Thread(this)).start();
		}catch(ConnectException ce){
			textArea.append("Can't connect to server!");
		}catch(UnknownHostException uhe){
			textArea.append("Unknown host!");
		}catch(IOException ioe){
			textArea.append("Error!");
		}
	}
	public void run(){
		String msg = null;
		try{
			while ((msg = in.readLine()) != null){
				textArea.append(msg + "\n");
				textArea.setCaretPosition(textArea.getText().length());
			}
			textArea.append("-------------------------------------------\n" +
				"Connection to the server was broken,\nplease close this client!");
		}catch(IOException ioe){
			textArea.append("-------------------------------------------\n" +
				"Connection to the server was broken,\nplease close this client!");
		}
	}
	class ReturnListener extends KeyAdapter{
		public void keyPressed(KeyEvent e){
			if (e.getKeyCode() == e.VK_ENTER){
				out.println(textField.getText());
				out.flush();
				textField.setText("");
				textArea.setCaretPosition(textArea.getText().length());
			}
		}
	}
	public class CloseListener extends WindowAdapter{
		public void windowClosing(WindowEvent e){
			try{
				out.close();
				in.close();
				socket.close();
			}catch(Exception ioe){
				System.out.println(ioe);
				System.exit(0);
			}
			System.exit(0);
		}
	}
	public static void main(String[] args){
		if (args.length == 0){
			new Client(DEFAULT_HOST , DEFAULT_PORT);
		}else if (args.length == 1){
			new Client(args[0] , DEFAULT_PORT);
		}else if (args.length == 2){
			try{
				new Client(args[0] , Integer.parseInt(args[1]));
			}catch(NumberFormatException nfe){
				System.out.println("USAGE: java Client <host> <port>");
			}
		}
		else
			System.out.println("USAGE: java Client <host> <port>");
	}
}