/* MoonCalendar.java
   Paul Carlisle - November 13, 1997
   
   The main program. Assembles and controls the three main program
   elements: the calendar, help and detail panel. Also determines user's
   screen resolution, and what fonts to use throughout the program.
*/


import java.awt.*;
import java.applet.*;
import java.net.*;
import java.lang.*;
import java.util.*;
import DateConstants;
import JDate;
import Calendar;
import textHelpPanel;
import detailPanel;

public class MoonCalendar extends Applet
{
   private int displayWidth;
   private int displayHeight;
   private JDate currentDate;
   private Calendar cal;
   private Font weekdayFont, daycellFont, inputFont;
   private Calendar calendarGrid;
   private Panel mainPanel;
   private CardLayout mainLayout;
   private textHelpPanel helpPanel;
   private detailPanel detPanel;
   private String currentPanel;
   private boolean help;
   private Image moonImage;
   private MediaTracker tracker;
   private Thread detailThread; // Experiment.
   

   public boolean handleEvent(Event e)
   {
	  if ( (e.id != Event.ACTION_EVENT) && (e.id != Event.MOUSE_DOWN) )
		 return true;
	  
	  // See who generated this event.
	  if (calendarGrid.getMessage() == true)
	  {
		 if (calendarGrid.getMessageID() == Calendar.DATE_SELECTED)
		 {
			// Need to flip to detail screen here.
			
			// Save the time from the current date.
			double temp = currentDate.getFracTime();
			
			// Get the selected date from the calendar grid.
			// This will be a day, with time set to midnight.
			JDate tempJD = new JDate();
			tempJD = calendarGrid.getSelectedDate();
			
			// Add the time back to the JD.
			currentDate.setJD(tempJD.getJD() + temp);
			
			detPanel.setDate(currentDate);
			detPanel.setControls();
			currentPanel = "Detail";
			detPanel.redraw(true);
			detPanel.thread = null;
			detPanel.thread = new Thread(detPanel);
			detPanel.thread.start();
			mainLayout.show(mainPanel, currentPanel);
		 }
		 else if (calendarGrid.getMessageID() == Calendar.HELP_REQUESTED)
		 {
			help = true;
			currentPanel = "Calendar";
			mainLayout.show(mainPanel, "Help");
		 }
	  }
	  else if (helpPanel.getMessage() == true)
	  {
		 if (currentPanel == "Detail")
		 {
			detPanel.thread = null;
			detPanel.thread = new Thread(detPanel);
			detPanel.setControls();
			detPanel.thread.start();
		 }
			
		 help = false;
		 mainLayout.show(mainPanel, currentPanel);
	  }
	  else if (detPanel.getMessage() == true)
	  {
		 if (detPanel.getMessageID() == detailPanel.CALENDAR)
		 {
			currentDate.setJD( (detPanel.getDate()).getJD() );
			detPanel.thread.stop();
			currentPanel = "Calendar";
			detPanel.setControls();
			
			calendarGrid.redraw(currentDate);
			mainLayout.show(mainPanel, currentPanel);
		 }
		 else if (detPanel.getMessageID() == detailPanel.HELP_REQUESTED)
		 {
			detPanel.thread.stop();
			help = true;
			currentPanel = "Detail";
			mainLayout.show(mainPanel, "Help");
		 }
	  }
	  
	  // Flush any pending messages out.
	  calendarGrid.getMessage();
	  helpPanel.getMessage();
	  detPanel.getMessage();
		 
	  return true;
   }   
   public void init()
   {
	  // Experiment - see how Properties work...
	  System.out.println("Properties: " + System.getProperty("java.version"));
	  // Call zero-arg constructor to set date to system's
	  // idea of date.
	  currentDate = new JDate();
	 
	  // Find resolution of user's screen.
	  Dimension d = new Dimension();
	  d = getToolkit().getScreenSize();
	  
	  // Resize to fit in common browser window.
	  displayHeight = (3 * d.height) / 4;
	  displayWidth = (3 * displayHeight) / 2;
	  
	  // OK, that didn't work, because Netscape doesn't honor sizing request.
	  // Try explicitly setting the size from the applet boundaries.
	  d = size();
	  
	  displayWidth = d.width;
	  displayHeight = d.height;
	  
	  // And finally, give up and declare the size explicitly.
	  displayWidth = 675;//450;
	  displayHeight = 450;//300;

	  
	  setBackground(Color.lightGray);
	  
	  // Set fonts.
	  weekdayFont = new Font("Helvetica", Font.PLAIN, 12);
	  daycellFont = new Font("Helvetica", Font.PLAIN, 8);
	  inputFont = new Font("Helvetica", Font.BOLD, 16);
	  
	  // Create a panel to hold the "cards" we want to display.
	  mainPanel = new Panel();
	  mainLayout = new CardLayout();
	  mainPanel.setLayout(mainLayout);
	  
	  // Get the URL from which this applet was loaded.
	  URL home = getCodeBase();
	  AppletContext context = getAppletContext();
	  
	  helpPanel = new textHelpPanel(displayWidth, displayHeight, inputFont, home, context);
	  mainPanel.add("Help", helpPanel);
	  
	  // Create the calendar card.
	  calendarGrid = new Calendar(currentDate, displayWidth, displayHeight, helpPanel,
								  daycellFont, weekdayFont, inputFont);
	  
	  // Add it to the deck.
	  mainPanel.add("Calendar", calendarGrid);
	  
	  // Add the deck to the main display.
	  add(mainPanel);
	 
	  help = false;
	  
	  currentPanel = "Calendar";
	  mainLayout.show(mainPanel, currentPanel);
	  
	  show();
	  
	  // Get the image to display on the detail screen.
	  tracker = new MediaTracker(this);
	  context.showStatus("Downloading image...");
	  moonImage = getImage(getDocumentBase(), "Moon204.gif");
	  tracker.addImage(moonImage, 0);
	  try
	  {
		 tracker.waitForID(0);
		 context.showStatus("");
	  }
	  catch (InterruptedException e)
	  { context.showStatus("");}
	  if (tracker.isErrorID(0))
	  {
		 // If we can't download the image, substitute a white circle.
		 moonImage = createImage(204, 204);
		 Graphics g = moonImage.getGraphics();
		 g.setColor(Color.black);
		 g.fillRect(0, 0, 204, 204);
		 g.setColor(Color.white);
		 g.fillOval(2, 2, 200, 200);
	  }
	  
	  detPanel = new detailPanel(displayWidth, displayHeight, inputFont,
								 weekdayFont, daycellFont, moonImage, helpPanel);
								 
	  mainPanel.add("Detail", detPanel);
   
   }   
   // Start up again if they return.
   public void start()
   {
	  if (currentPanel == "Detail")
	  {
		 detPanel.setControls();
		 detPanel.thread = null;
		 detPanel.thread = new Thread(detPanel);
		 detPanel.thread.start();
	  }
   }   
   // Be polite, and stop the animation when the user leaves the page.
   public void stop()
   {
	  if (detPanel.thread != null)
	  {
		 detPanel.thread.stop();
		 detPanel.thread = null;
	  }
   }   
   public void update(Graphics g)
   {
	  paint(g);
   }   
}