public class RPS {

    public static final int Rock = 0;
    public static final int Paper = 1;
    public static final int Scissors = 2;

    private UserInterface ui;
    private ComputerPlayer cp;
    private Tally tally;

    public RPS() {
	ui = new UserInterface();
	cp = new ComputerPlayer();
	tally = new Tally("Computer", "User");
    }
    
    public void play() {
	boolean goagain = true;
	int cpchoice, userchoice;
	String winner;
	//keep playing
	do {
	    //get computer choice
	    cpchoice = cp.getNextChoice();
	    //get user choice
	    userchoice = ui.getNextChoice();
	    
	    //reveal computer and user choices
	    ui.printChoice(cpchoice, "Computer");
	    ui.printChoice(userchoice, "User");
	    
	    //determine the winner
	    winner = determineWinner(cpchoice, userchoice);
	    //update the score tally
	    tally.updateTally(winner);
	    
	    //print the winner and tally
	    ui.printWinner(winner);
	    ui.printTally(tally);
	    
	    //see if the user wants to play again
	    goagain = ui.goAgain();
	} while(goagain == true);

    }
    
    private String determineWinner(int cpchoice, int userchoice) {
       
	if(cpchoice == userchoice) {
	    return "Tie";
	} else if((cpchoice == Scissors && userchoice == Paper) || 
		  (cpchoice == Paper && userchoice == Rock) || 
		  (cpchoice == Rock && userchoice == Scissors)) {
	    return "Computer";
	} else {
	    return "User";
	}
    }

}