/**
 * SimpleSunApplet displays a world map showing the sunrise and sunset terminators.<p>
 *
 * Copyright &copy; 1996-98 Martin Minow. All Rights Reserved.<p>
 * World map copyright &copy; 1992-97 Apple Computer Inc. All Rights Reserved.
 * Used by permission.<p>
 *
 * Permission to use, copy, modify, and redistribute this software and its
 * documentation for personal, non-commercial use is hereby granted provided that
 * this copyright notice and appropriate documentation appears in all copies. This
 * software may not be distributed for fee or as part of commercial, "shareware,"
 * and/or not-for-profit endevors including, but not limited to, CD-ROM collections,
 * online databases, and subscription services without specific license.<p>
 *
 * @author <a href="mailto:minow@merrymeet.com">Martin Minow</a>
 * @version 1.1 (from SunClock 1.1)
 * 1996.09.21
 * 1997.05.29 - Added GMT time string, removed Astro class.
 * 1997.11.12 - Use SunrisePixels.java to consruct and manage the image.
 * Set tabs every 4 characters.
 */
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.*;
import java.util.*;
import java.net.*;

public class SimpleSunApplet
	extends java.applet.Applet
	implements java.lang.Runnable
{
	public static final String copyright	=
							"Copyright 1996-98 Martin Minow. All Rights Reserved";
	public static final String author		= "mailto:minow@merrymeet.com";
	public static final String name    	= "SimpleSunApplet";
	public static final String version		= "1.0.1";
	public static final String imageName	= "EarthImage270.gif";
	public static final String chimeName	= "DecClockTower.au";
	public static final String parameterInfo[][] = {
			{ "bgcolor", "color",	"The background color, #RRGGBB (in hex)"	},
		};

	protected SimpleTimeBarCanvas	timeBarCanvas;
	protected SunriseCanvas		sunriseCanvas;
	protected AudioClip			hourBell;
	protected int					currentHour		= new Date().getHours();
	protected Font					displayFont		= new Font("Helvetica", Font.PLAIN, 10);
	protected Thread				runner;
	protected boolean				test			= false;
	protected long					testDate		= new Date().getTime();

	/**
	 * Applet initialization.
	 */
	public void init()
	{
		showStatus(copyright + ", version " + version);
		try {
			new Thread().sleep(100L);	/* Force the copyright to the display	*/
		} catch (Exception e) {}
		showStatus("");
		this.setFont(displayFont);
		sunriseCanvas			= new SunriseCanvas(getImage(getCodeBase(), imageName));
		timeBarCanvas			= new SimpleTimeBarCanvas(sunriseCanvas);
		getBackgroundColor();
		/* */
		/* setBackground(new Color(0xCCCCFF));		*/
		Panel panel				= new Panel();
		GridBagLayout gridbag	= new GridBagLayout();
		GridBagConstraints c	= new GridBagConstraints();
		c.gridx					= 0;
		c.gridy					= 0;
		c.gridwidth				= 1;
		c.gridheight			= 1;
		c.fill					= GridBagConstraints.HORIZONTAL;
		c.anchor				= GridBagConstraints.SOUTH;
		c.insets				= new Insets(0, 0, 0, 0);
		gridbag.setConstraints(sunriseCanvas, c);
		panel.add(sunriseCanvas);
		c.gridy					= 1;
		c.anchor				= GridBagConstraints.NORTH;
		gridbag.setConstraints(timeBarCanvas, c);
		panel.add(timeBarCanvas);
		this.setLayout(new BorderLayout());
		this.add("Center", panel);
		Label gmtNote			= new Label(
			    "Time values are referenced to GMT, not local time",
			    Label.CENTER
			);
		validate();
	}
	/**
	 * Paint the applet - essentially, just the background with a frame around it.
	 */
	public void paint(Graphics g)
	{
		g.setColor(getBackground());
		g.fillRect(0, 0, size().width - 1, size().height - 1);
		g.setColor(Color.black);
		g.drawRect(0, 0, size().width - 1, size().height - 1);
	}
	/**
	 * The applet is initialized: start it by creating the asynchronous thread.
	 */
	public void start()
	{
		if (runner == null) {
			runner = new Thread(this);
			runner.start();
		}
		if (hourBell == null) {
			try {
				hourBell = getAudioClip(getCodeBase(), chimeName);
				/* hourBell.play(); */	/* Debug */
			}
			catch (Exception e) {
				hourBell = null;
			}
		}
	}
	/**
	 * The applet thread is running.
	 */
	public void run()
	{
		showStatus("");			/* Clean out the status line	*/
		while (runner != null) {
			Date		now;
			if (test) {
				/*
				 * Self test. Increment the date by one day + 15 minutes.
				 */
				now				= new Date(testDate);
				testDate		+= (24 * 60 * 60 * 1000) + (15 * 60 * 1000);
			}
			else {
				now				= new Date();
				int thisHour	= now.getHours();
				if (hourBell != null && thisHour != currentHour) {
					currentHour = thisHour;
					hourBell.play();
				}
			}
			sunriseCanvas.setDate(now);
			timeBarCanvas.repaint();
			showStatus(now.toGMTString());
			long sleepTime;
			if (test) {
				sleepTime = 500;
			}
			else {
				/*
				 * Sleep until the start of the next minute. Get the current
				 * time (in milliseconds), round it up to the next minute,
				 * and sleep for the difference. To avoid choking slow browsers,
				 * make sure that we sleep at least 30 seconds.
				 */
				sleepTime = 60000 - (System.currentTimeMillis() % 60000);
				while (sleepTime < 30000) {
					sleepTime += 60000;
				}
			}
			try {
				runner.sleep(sleepTime);
			}
			catch (InterruptedException e) {}
		}
	}
	/**
	 * The applet context wants to stop us. Just delete the thread.
	 */
	public void stop()
	{
		runner = null;
		hourBell = null;
	}
	/**
	 * We're all done for now. Make sure that the thread is deleted.
	 */
	public void destroy()
	{
		stop();
	}
	/**
	 * For debugging, return some information about our applet.
	 */
	public String getAppletInfo()
	{
		String result = getClass().getName()
			+ ", " + copyright
			+ ", " + author;
		return (result);
	}
	public String[][] getParameterInfo()
	{
		return (parameterInfo);
	}
	public void getBackgroundColor()
	{
		String		colorName	= getParameter("bgcolor");
		if (colorName != null) {
			if (colorName.charAt(0) == '#') {
				colorName = colorName.substring(1);
			}
			try {
				int	color = Integer.parseInt(colorName, 16);
				setBackground(new Color(color));
			}
			catch (NumberFormatException e) {}
		}
	}
}