class HPlayer extends Player {

    HPlayer(String name) { super(name); }
    
    // ------------------------------------------------------------------

    // a medium for communication to/with player
    private IHDisplay io;

    // register a Display area 
    public void registerDisplay(IDisplay d) {
	this.io = (IHDisplay)d; 
    }

    // receive information from server 
    public void inform(String msg) {
	io.msgDisplay(msg); 
    }

    // Java can only close over fields, not local variables
    private Turn turn; 
    private boolean done = false; 

    // enable the human player to take a turn 
    public boolean turn(Turn t) {
	this.turn = t; 

	// interact with player:
	io.msgDisplay("It's your turn!"); 	
	io.listen
	    (new IListener () {
		    public void done() {
			turn.skip();
			done = true; 
		    }
		    public int roll() {
			int r = turn.roll();
			sum += r; 
			return r; 
		    }
		    public void skip() {
			turn.skip();
		    }
		});
	// end of interaction 

	io.sumDisplay(sum);
	if (sum <= 21)
	    io.msgDisplay("Turn's up.");
	else {
	    done = true; 
	    io.msgDisplay("Oops, lost this one."); 
	};
	    
	return done; 
    }

    // ------------------------------------------------------------------
    // Examples: 

    static HPlayer h1;
    static SPlayer s1;
    static Turn t1;
    static Turn t2;  
    
    public static void createExamples() {
	if (h1 == null) {
	    h1 = new HPlayer("test1");    
	    s1 = new SPlayer(h1);         
	    t1 = new Turn(s1, new Die()); 
	    t2 = new Turn(s1, new Die());
	}
    }

    // ------------------------------------------------------------------
    // Tests: 

    public static void main(String argv[]) {

	h1.registerDisplay(TestIHDisplay.testIDisplay); 

	h1.inform("welcome to human player 1");
	
	boolean done = h1.turn(t1);
	done = h1.turn(t1); 
	Tester.check(s1.done,"human cheat"); 
	
	done = h1.turn(t2); 

	// cheating wasn't caught
	s1.sum = 22;
	done = h1.turn(t2);
	Tester.check(s1.done,"human cheat 3"); 
	Tester.check(s1.sum == 0,"human cheat 4"); 
    }

}