package rmiClient;

/**
 *
 * @author Patrick and Tenzin
 * @date 25 nov 2008
 * @version 1.0
 */

    
    
import java.io.*;
import java.applet.*;
import java.awt.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import java.rmi.*;



public class Client extends Applet
{  
    
	private static final long serialVersionUID = 1L;
	private TextArea  display = new TextArea();
	private TextField input   = new TextField();
	private Button    send    = new Button("Send"), connect = new Button("Connect"),
                     quit    = new Button("Bye");
	private String    serverName;
	private String nickname = "";
        
        // new objects for supporting RMI functionallity
        ChatObjectInterface chat;
        rmiServer.ServerInterface server;

     
        /*
         * method for initializing the applet, it paints the window, sets the buttons
         * 
         */
   public void init() { 
      Panel keys = new Panel();
      keys.setLayout(new GridLayout(1,2));
      keys.add(quit); 
      keys.add(connect);
      Panel south = new Panel();
      south.setLayout(new BorderLayout());
      south.add("West", keys);
      south.add("Center", input);
      south.add("East", send);
      Label title = new Label("Simple Chat Client Applet", Label.CENTER);
      title.setFont(new Font("Helvetica", Font.BOLD, 14));
      setLayout(new BorderLayout());
      add("North", title);
      add("Center", display);
      add("South",  south);
      quit.setEnabled(false);
      send.setEnabled(false);
      
      // first get the parameters (do the user request) and then establish the connection to server
      getParameters();
      try {
	connect();	
      } catch (Exception e) {
	e.printStackTrace();
      }
   }
   
   /**
    * 
    * method that handles the actions performed on the client side inside the applet.
    * it handles the events for connecting to the server and sending messages.
    * by clicking the bye button it handles the quitting.
    * 
    */
   public boolean action(Event e, Object o) {  
       
       if (e.target == quit) {
           input.setText("/exit");
           quit.setEnabled(false);
           send.setEnabled(false);
           connect.setEnabled(false);
           handle("/exit");
       }
       
       else if (e.target == connect) {
           getParameters(); // request parameters newly from user by showing input dialogs
           try {
               connect(); // connect again
           } catch (NotBoundException ex) {
               Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
           }
       }
       
       else if (e.target == send) { 
           send(); 
           input.requestFocus(); 
       }
      return true;
   }
   
  /*
   * this method is called when clicking the connect button,
   * it establishes the connection to the server by first looking up for
   * RMICHAT on the serverside.
   */
   private void connect() throws NotBoundException {
       println("Establishing connection. Please wait ...");
      try {
          chat = new ChatObject(this);	
	 server = (rmiServer.ServerInterface)Naming.lookup("//"+ serverName +"/RMICHAT");
         server.connect(nickname, chat);
         send.setEnabled(true);
         connect.setEnabled(false);
         quit.setEnabled(true);
         join();
      } catch(java.rmi.UnknownHostException uhe) {
          println("Host unknown: " + uhe.getMessage()); 
          getParameters(); 
      } catch(IOException ioe) { 
          println("Unexpected exception: " + ioe.getMessage()); 
          getParameters(); 
      }
   }

   /*
    * send method is called when clicking the send button in the applet,
    * it sends the nickname with his message to the server which then
    * broadcasts the message to all clients connected (done at server side).
    */
   private void send() {
       try {
           String message = input.getText();
           server.send(nickname + ": " + message); input.setText("");
       } catch(Exception e) { 
           println("Sending error: " + e.getMessage());
           println("Server may be down at the time, program gets terminated.");
           handle("/exit");
       } 
   }
    
   /* sending out the join message to the server
    */
   private void join() {
       try {
           server.send(nickname + " joined the chat!"); input.setText("");
       } catch(Exception e) { 
           println("Sending error: " + e.getMessage());
           println("Server may be down at the time, program gets terminated.");
           handle("/exit");
       } 
   }
   
   /* sending out the leave message to the server
    */
   private void leave() {
       try {
           server.send(nickname + " left the chat!"); input.setText("");
       } catch(Exception e) { 
           println("Sending error: " + e.getMessage());
           println("Server may be down at the time, program gets terminated.");
           handle("/exit");
       } 
   }
   
   
   /* modified method to handle RMI (public method header now)
    stands for SEND
    */
   public void handle(String msg) {
       if (msg.equals("/exit")) {
            try {
                leave();
                server.disconnect(chat);
            } catch (RemoteException ex) {
                Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
            }
           println("Good bye. You can now close the window ...");  
           quit.setEnabled(false);
           send.setEnabled(false);
           connect.setEnabled(false);
       } else println(msg);
   }

   
   /*modified method to handle RMI (public method header now)
    stands for RECEIVE
    */
   public void println(String msg) {
       display.append(msg + "\n");
   }
   
   public void getParameters() {
      
      
        serverName = JOptionPane.showInputDialog(null, "Enter server ip : ");
        System.out.println(serverName);
       
        nickname = JOptionPane.showInputDialog(null, "Enter nickname : ");
        System.out.println(nickname);
      
   }
   
   
}