// example from the book Java in a Nutshell by David Flanagan.
// Written by David Flanagan.  Copyright (c) 1996 O'Reilly 
// MODIFIED by Adam Plowcha & Dr. Roger Webster

import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;

public class cs406window extends Applet 
{
    public static final int PORT = 6789;
    Socket s;
    DataInputStream in;
    PrintStream out;
    TextField inputfield;
    TextArea outputarea;
    StreamListener listener;
    Frame window;

// Create a socket to communicate with server on port 6789 of
// host that the applet's is on.  Create streams to use with
// the socket.  create a TextField for user input and a TextArea
// for server output.  Finally, create a thread to wait for and 
// display server output.

    public void init() {

        try {
	
            s = new Socket(this.getCodeBase().getHost(), PORT);
            in = new DataInputStream(s.getInputStream());
            out = new PrintStream(s.getOutputStream());

	//creates input output fields...
	inputfield = new TextField();
	outputarea = new TextArea();


	// No typing in output field...
	outputarea.setEditable(false);
	listener = new StreamListener(in, outputarea);


	//Buttons to panel on page...
	this.setLayout(new FlowLayout());
	this.add(new Button("OPEN"));
	this.add(new Button("CLOSE"));


	// Open window outside of page...
       window = new Frame ("CS406 Client-Server Communication");
	this.add(window);


	// Add stuff like menu, tear-off flag, etc...
	window.setLayout (new BorderLayout());
	window.add("North", inputfield);
	window.add("Center", outputarea);

	MenuBar a = new MenuBar();
	Menu b = new Menu("Options", true);
	b.add(new MenuItem("Open"));
	b.add(new MenuItem("Close"));
	b.add(new MenuItem("Quit"));
	a.add(b);
	window.setMenuBar(a);

	// Display all the stuff just created...
	window.pack();
	window.show();
	show();
	this.showStatus("Connected to "
		+ s.getInetAddress().getHostName()
		+ ":" + s.getPort());

	}
	catch (IOException e) this.showStatus(e.toString());
}

    
    // Button and Menu events...

    public boolean action(Event e, Object what)
    {
        if (e.target instanceof MenuItem) {
            String label = (String)what;
            if (label.equals("Open")){
		if (!window.isShowing())
		    window.show();
	}

	else if (label.equals("Close")){
	    if (window.isShowing())
	    	window.hide();
	}
 
        else if (label.equals ("Quit")) {
	    outputarea.setText("quit the window");
            inputfield.setText("quit the window");
	    //window.hide();
	   //window.dispose();
	} 
	return true;
}

        else if (e.target instanceof Button) {
            String label = (String)what;
            if (label.equals("OPEN")){
		if (!window.isShowing())
		    window.show();
      }

	else if (label.equals ("CLOSE")){
	    if (window.isShowing())
	    	window.hide();
      }
      return true;
  }

  else if (e.target == inputfield){
	   out.println((String)e.arg);
           inputfield.setText("");
           return true;
	}

  else return false;
}
}

// Wait for output from the server on the specified stream, and display
// it in the specified TextArea.
class StreamListener extends Thread {
    DataInputStream in;
    TextArea output;
    public StreamListener(DataInputStream in, TextArea output) {
        this.in = in;
        this.output = output;
        this.start();
    }
    public void run() {
        String line;
        try {
            for(;;) {
                line = in.readLine();
                if (line == null) break;
                output.setText(line);
            }
        }
        catch (IOException e) output.setText(e.toString());
        finally output.setText("Connection closed by server.");
    }
}