public class TakeAwayGame {

    public static final int MAX_TAKE_AWAY = 3;
    public static final int USER = 1;
    public static final int COMPUTER = 2;
    private int nSticks = 21;
    private int player = USER;   // User goes first

    public TakeAwayGame() { }

    public TakeAwayGame(int n) {
        nSticks = n;
    }
    
    public boolean takeAway(int n) {
	if (n < 1) 
	    return false;
        else if (n > MAX_TAKE_AWAY)
	    return false;
        else if (n > nSticks)
	    return false;
        else {
	    nSticks = nSticks - n;
            player = player + 1;
            if (player > 2)
                player = 1;
	}
	return true;
    }

    public int sticksLeft() {
        return nSticks;
    }

    public int getPlayer() {
        return player;
    }
    
    public boolean gameOver() {
        if (nSticks == 0)
            return true;
        else
            return false;
    }
    
    public int getWinner() {
        if (nSticks == 0) 
            if (player == COMPUTER)
                return COMPUTER;
            else
                return USER;
        return -1;    // No winner, game not over
    }
}