import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;
import Clock;

interface Countdown_action
{
    abstract void countdown_action ();
}

public class Hello extends Applet implements Countdown_action
{
    int clock_start_minutes=1, clock_start_seconds=20,
	clock_width=40*4+20, clock_height=80;
    Clock myclock;
    CardLayout mylayout;
    
/*
**  "init(), start(), stop(), destroy()" 
**   lifecycle method of class Applet.
*/
    public synchronized void init()
    {
	String arg;
	// get parameters from applet <param> tag fields
	arg = getParameter("clock_start_minutes");
	if (arg != null)  clock_start_minutes=Integer.parseInt(arg);
	arg = getParameter("clock_start_seconds");
	if (arg != null)  clock_start_seconds=Integer.parseInt(arg);
	arg = getParameter("clock_height");
	if (arg != null) clock_height = Integer.parseInt(arg);
	arg = getParameter("clock_width");
	if (arg != null) clock_width = Integer.parseInt(arg);
	myclock = new Clock(clock_start_minutes,
			    clock_start_seconds,
			    clock_width, clock_height,
			    this);
	//setLayout(new FlowLayout(FlowLayout.CENTER));
	setLayout(mylayout = new CardLayout());
        add(myclock);
	repaint();
    }

    public void countdown_action ()
    {
	getAppletContext().showStatus("Count down finished");
	remove((Component) myclock);
	requestFocus();
	repaint();
	myclock.clockthread.stop();
	myclock = null;
	System.gc();
    }
    
    public synchronized void start()
    {
	if (myclock.clockthread.isAlive())
	    myclock.clockthread.resume();
	else
	    myclock.clockthread.start();
    }
    
    public void stop()
    {
	myclock.clockthread.suspend();
    }

    public void destroy()
    {
	myclock.clockthread.stop();
    }

    public void paint(Graphics g)
    {
        //Draw a Rectangle around the applet's display area.
        g.drawRect(0, 0, size().width-1, size().height-1);
	g.drawLine(0, 0, size().width-1, size().height-1);
	g.drawLine(size().width-1, 0, 0, size().height-1);
    }
}