import java.awt.*;
import java.applet.*;

// A simple game in which each player can take 1, 2 or 3 matches at a time. 
// Whoever takes the last match wins. We play against the user.

// Department of Computer Science, Monash University, Australia 3168

public class TwentyOne extends Applet {
    static final int MAXMATCHES = 21;
    static final int MATCHWIDTH = 10;
    static final int MATCHHEIGHT = 40;

    Image liveMatchImage, deadMatchImage;
    int liveMatches = MAXMATCHES;	// Current position
    int deadMatches = 0;		// Our most recent move
    int winner = 0;			// 0=none; 1=us; 2=user

    // Load the graphics at the start.
    public void init() {
	liveMatchImage = getImage(getCodeBase(), "images/liveMatch.gif");
	deadMatchImage = getImage(getCodeBase(), "images/deadMatch.gif");
   }

    // Draw the applet whenever requested.
    public void paint(Graphics g) {
	g.setColor(Color.cyan);
	g.drawLine(0, MATCHHEIGHT+18, MAXMATCHES*MATCHWIDTH, MATCHHEIGHT+18);
	g.drawLine(0, MATCHHEIGHT+19, MAXMATCHES*MATCHWIDTH, MATCHHEIGHT+19);
	g.drawLine(0, MATCHHEIGHT+20, MAXMATCHES*MATCHWIDTH, MATCHHEIGHT+20);

	for (int r = 0 ; r < liveMatches ; r++)
	     g.drawImage(liveMatchImage, r*MATCHWIDTH, 10, this);
	for (int r = 0 ; r < deadMatches ; r++)
	    g.drawImage(deadMatchImage, (liveMatches+r)*MATCHWIDTH, 10, this);

	g.setColor(Color.black);
	if (winner == 1) g.drawString("I win!", 50, MATCHHEIGHT+10);
	if (winner == 2) g.drawString("You win!", 50, MATCHHEIGHT+10);
    }

    // The user has clicked in the applet. Show their move and our response.
    public boolean mouseUp(Event e, int x, int y) {
	if (liveMatches <= 0) {				// Restart the game
	    liveMatches = MAXMATCHES;
	    deadMatches = 0;
	    winner = 0;
	} else {
	    int thisMatch = 1 + x / MATCHWIDTH;
	    if (thisMatch < liveMatches-2 || thisMatch > liveMatches)
		play(getCodeBase(), "audio/beep.au");	// Illegal move
	    else {
		play(getCodeBase(), "audio/return.au");	// Legal move
		liveMatches = thisMatch-1;		// Record user's move
		if (liveMatches == 0) winner = 2;
		deadMatches = liveMatches%4;		// Determine our move
		if (deadMatches == 0) deadMatches = 1 + (int)(Math.random() * 3);
		liveMatches -= deadMatches;
		if (liveMatches == 0) winner = 1;
	    }
	}
	repaint();
	return true;
    }
}

// Prof. L. Goldschlager, Department of Computer Science,
//                        Monash University, Australia 3168 / 1996