/*
 * LearnFast.java (c)1998 manifestation.com
 *
 * revised 0715.2001 - added fonts, switched to BorderLayout
 */

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

public class LearnFast extends Applet implements Runnable {
  
    String [] messages = new String [0];
    int thisMessage;
    Label theLabel;
    Thread blinkThread;
    boolean blinkState;
    int tick=1; // tracks times thread has looped
    Color fg;
    Color bg;

    public void init() {
	System.out.println("Chosen cardset = " + getParameter("cardset") );

	// get the cards from a file..
	try {
	    
	    URL url = new URL(getCodeBase(), getParameter("cardset"));

	    System.out.println("Getting the stuff from..." + url );
	    
	    BufferedReader bin = new BufferedReader (
	        new InputStreamReader( url.openStream ())
	    );
	    
	    String line;

	    // for each card:
	    while ( (line = bin.readLine()) != null) {
	
		System.out.println("reading: " + line);

		// add another slot to the messages array
		String [] temp = new String [ messages.length + 1 ];
		System.arraycopy( messages, 0, temp, 0, messages.length );
		messages = temp;
	
		// and fill it with the line we read in..
		messages[messages.length-1] = line;
	
	    }

	} catch ( Exception e ) { }
    
	System.out.println("now setting up graphics stuff...");

	// now set up our interface
	setLayout( new BorderLayout() );
	theLabel = new Label(messages[0], Label.CENTER);
	theLabel.setFont(new Font("Monospaced", Font.BOLD, 20 ));
	add( theLabel );
    }


    public void blink(){

	blinkState = !blinkState;
	if (blinkState) {
	    fg = Color.black;
	    bg = Color.white;  
	} else {
	    fg = Color.white;
	    bg = Color.black;  
	}

	//setBackground( bg );
	theLabel.setBackground( bg );
	theLabel.setForeground( fg );
	
	// every 4 times, change the text
	if (tick++ % 4 == 0) {
	    if (++thisMessage >= messages.length) thisMessage = 0;
	    theLabel.setText(messages[thisMessage]);
	    theLabel.invalidate(); // for old VM's
	    validate();
	}

	repaint();
    }

    public void run() {
	System.out.println("in run..");
	while ( true ) {
	    blink();
	    try {
		Thread.sleep(500);
	    } catch (Exception e) { }
	}
    }


    // called whenever the applet comes on screen
    public void start() {
	System.out.println("in start()..");
	if ( blinkThread == null ){
	    blinkThread = new Thread(this);
	    blinkThread.start();
	}
    }

    // called whenever the applet goes off screen
    public void stop() {
	System.out.println("in stop()..");
	blinkThread = null;
    }

}