import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;

public class Client extends JFrame implements Runnable {

   private Thread thread = new Thread(this);
   private boolean running = true;

   private Socket s = null;
   private PrintWriter out = null;
   private BufferedReader in = null;

   private static String host = "127.0.0.1";
   private static int port = 2000;
   private JTextField textField = new JTextField();
   private JTextArea textArea = new JTextArea();

   public static void main(String args[]) {
      if(args.length != 0) {
         host = args[0];
         if(args.length != 1) {
            port = Integer.parseInt(args[1]);
         }
      }
      
      new Client();
   }

   public Client() {
      textField.addActionListener(new L2());
      getContentPane().add("North", textField);
      getContentPane().add("Center", new JScrollPane(textArea));
      setLocation(420, 0);
      setSize(400, 200);
      addWindowListener(new L1());
      setVisible(true);

      try {
         s = new Socket(host, port);
         setTitle("CONNECTED TO: " + host + " - ON PORT: " + port);
         in = new BufferedReader(new InputStreamReader(s.getInputStream()));
         out = new PrintWriter(s.getOutputStream(), true);
      } catch (IOException ioe) {
         System.out.println("COULD NOT CONNECT: "+ ioe);
         killMe();
      }
      thread.start();
   }

   public void run() {
      String inputLine = "";
      while(running) {
         try {
            inputLine = in.readLine();
         } catch(NullPointerException npe) {
            System.out.println("NullPointer generated: " + npe);
            System.out.println("Stopping client!");
            running = false;
            killMe();
         } catch(IOException ioe) {
            System.out.println("IOException generated: " + ioe);
            System.out.println("Stopping client!");
            running = false;
            killMe();
         }
         textArea.append(inputLine + "\n"); 
         textArea.setCaretPosition(textArea.getText().length()); 
         Toolkit.getDefaultToolkit().beep();             
      }
   }

   private void sendMessage(String message) {
         out.println(message);
         if(message.equals("exit")) killMe();
   }

   private String getHost(Socket s) {
      try {
         return(s.getInetAddress().getLocalHost().getHostName());
      } catch(UnknownHostException e) {
         return("unknown");
      }
   }

   public void killMe() {
      running = false;
      dispose();
      try {
         out.close();
         in.close();
         s.close();
      } catch(IOException ioe) {
         System.out.println("IOException generated: " + ioe);
      }
      System.exit(1);
   }

   class L1 extends WindowAdapter {
      // Anropar inte killMe har sa jag kan testa osnygga avslut :-)
      public void windowClosing(WindowEvent we) {
         dispose();
      }

      public void windowClosed(WindowEvent we) {
         System.exit(1);
      }
   }

   class L2 implements ActionListener {
      public void actionPerformed(ActionEvent ae) {
         sendMessage(textField.getText());
         textField.setText("");
      }
   }
}