/**
 * This class implements the rules to play a 
 * craps game.
 */
public class CrapsGame
{

    public CrapsGame()
    {
        gameState = COME_OUT_STATE;
        boxPoints = 0;
        numRolls = 0;
        dieRoller = new Die();
    }
    
    /**
     * getGameState() - returns the current state.
     * 
     * @return     current state 
     */
    public String getGameState()
    {
        String stateText;
        
        switch( gameState )
        {
        case COME_OUT_STATE:
            stateText = "COME_OUT";
            break;
            
        case SHOOTING_STATE:
            stateText = "SHOOTING";
            break;
            
        case WON_STATE:
            stateText = "WON";
            break;
            
        case LOST_STATE:
            stateText = "LOST";
            break;
            
        default:
            stateText = "undefined";
            break;
        }
        
        return stateText;
    }
    
    
    public void shoot()
    {
        switch( gameState )
        {
        case WON_STATE:
        case LOST_STATE:
            break;
            
        case COME_OUT_STATE:
            firstRoll();
            break;
            
        case SHOOTING_STATE:
            nextRoll();
            break;
        }
    }
    
    public void play()
    {
        do
        {
            shoot();
        }
        while( !isGameOver() );
    }
    
    public boolean isGameWon()
    {
        return gameState == WON_STATE;
    }
    
    public boolean isGameLost()
    {
        return gameState == LOST_STATE;
    }
    
    public boolean isGameOver()
    {
        return isGameWon() || isGameLost();
    }
    
    private int rollDice()
    {
        int die1 = dieRoller.roll();
        int die2 = dieRoller.roll();
        numRolls ++;
        return die1 + die2;
    }
       
    
    private void firstRoll()
    {
        int points = rollDice();
        
        switch( points )
        {
        case 7:
        case 11:
            gameState = WON_STATE;
            break;
    
        case 2:
        case 3:
        case 12:
            gameState = LOST_STATE;
            break;
            
        default:
            boxPoints = points;
            gameState = SHOOTING_STATE;
            break;
        }
    }
    
    private void nextRoll()
    {
        int points = rollDice();
        
        if( points == boxPoints )
            gameState = WON_STATE;
        else if( points == 7 )
            gameState = LOST_STATE;
    }
     
    private static final int COME_OUT_STATE = 0;
    private static final int SHOOTING_STATE = 1;
    private static final int WON_STATE = 2;
    private static final int LOST_STATE = 3;
   
    private int gameState;
    private int boxPoints;
    private int numRolls;
    private Die dieRoller;
}