/*
 * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
import java.applet.Applet;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;

public class QuoteClientApplet extends Applet {
    boolean DEBUG = true;
    InetAddress address;
    TextField portField;
    Label display;
    DatagramSocket socket;

    public void init() {
	//Initialize networking stuff.
	String host = getCodeBase().getHost();

	try {
	    address = InetAddress.getByName(host);
	} catch (UnknownHostException e) {
	    System.out.println("Couldn't get Internet address: Unknown host");
	    // What should we do?
	}

	try {
	    socket = new DatagramSocket();
	} catch (SocketException e) {
	    System.out.println("Couldn't create new DatagramSocket");
	    return;
	}

	//Set up the UI.
	GridBagLayout gridBag = new GridBagLayout();
	GridBagConstraints c = new GridBagConstraints();
	setLayout(gridBag);

	Label l1 = new Label("Quote of the Moment:", Label.CENTER);
	c.anchor = GridBagConstraints.SOUTH;
	c.gridwidth = GridBagConstraints.REMAINDER;
	gridBag.setConstraints(l1, c); 
	add(l1);

	display = new Label("(no quote received yet)", Label.CENTER);
	c.anchor = GridBagConstraints.NORTH;
	c.weightx = 1.0;
	c.fill = GridBagConstraints.HORIZONTAL;
	gridBag.setConstraints(display, c); 
	add(display);

	Label l2 = new Label("Enter the port (on host " + host
			     + ") to send the request to:", 
			     Label.RIGHT);
	c.anchor = GridBagConstraints.SOUTH;
	c.gridwidth = 1;
	c.weightx = 0.0;
	c.weighty = 1.0;
	c.fill = GridBagConstraints.NONE;
	gridBag.setConstraints(l2, c); 
	add(l2);

	portField = new TextField(6);
	gridBag.setConstraints(portField, c); 
	add(portField);

	Button button = new Button("Send");
	gridBag.setConstraints(button, c); 
	add(button);

	validate();
    }

    public Insets insets() {
	return new Insets(4,4,5,5);
    }

    public void paint(Graphics g) {
        Dimension d = size();
        Color bg = getBackground();

        g.setColor(bg);
        g.draw3DRect(0, 0, d.width - 1, d.height - 1, true);
        g.draw3DRect(3, 3, d.width - 7, d.height - 7, false);
    }

    void doIt(int port) {
	DatagramPacket packet;
	byte[] sendBuf = new byte[256];
	
	packet = new DatagramPacket(sendBuf, 256, address, port);

	try { // send request
	    if (DEBUG) {
	        System.out.println("Applet about to send packet to address "
		               + address + " at port " + port);
	    }
	    socket.send(packet);
	    if (DEBUG) {
	        System.out.println("Applet sent packet.");
	    }
	} catch (IOException e) {
	    System.out.println("Applet socket.send failed:");
	    e.printStackTrace();
	    return;
	}

	packet = new DatagramPacket(sendBuf, 256);

	try { // get response
	    if (DEBUG) {
	        System.out.println("Applet about to call socket.receive().");
	    }
	    socket.receive(packet);
	    if (DEBUG) {
	        System.out.println("Applet returned from socket.receive().");
	    }
	} catch (IOException e) {
	    System.out.println("Applet socket.receive failed:");
	    e.printStackTrace();
	    return;
	}

	String received = new String(packet.getData(), 0);
	if (DEBUG) {
	    System.out.println("Quote of the Moment: " + received);
	}
	display.setText(received);
    }

    public boolean action(Event event, Object arg) {
	int port;
	
	try {
	    port = Integer.parseInt(portField.getText());
	} catch (NumberFormatException e) {
	    //No integer entered.  Should warn the user.
	    return true;
	}

	doIt(port);
	return true;
    }
}