// CardDeck.java
//
// Author: Rahul Simha
// Feb, 2008
//
// A deck of cards, and some operations.
//
// Convention: 
//   Spades: 0..12
//   Hearts: 13..25
//   Diamonds: 26..38
//   Clubs: 39..51

public class CardDeck {

    int size = 52;
    int[] cards;


    public CardDeck () 
    {
	cards = new int [size];
	for (int i=0; i<size; i++) {
	    cards[i] = i;
	}
	shuffle ();
    }


    public void shuffle ()
    {
	for (int i=0; i<size; i++) {
	    // Pick a random card for the i-th position.
	    int k = RandTool.uniform (0, size-1);
	    // Swap.
	    int temp = cards[i];
	    cards[i] = cards[k];
	    cards[k] = temp;
	}
    }


    public int drawWithReplacement ()
    {
	return RandTool.uniform (0, size-1);
    }


    public int drawWithoutReplacement ()
    {
	int k = RandTool.uniform (0, size-1);
	int drawnCard = cards[k];
	// Shift left.
	for (int i=k; i<size-1; i++) {
	    cards[i] = cards[i+1];
	}
	size --;
	return drawnCard;
    }


    public boolean isSpade (int c)
    {
	if ( (c >=0) && (c <= 12) ) {
	    return true;
	}
	return false;
    }


    public boolean isHeart (int c)
    {
	if ( (c >=13) && (c <= 25) ) {
	    return true;
	}
	return false;
    }


    public boolean isClub (int c)
    {
	if ( (c >=26) && (c <= 38) ) {
	    return true;
	}
	return false;
    }


    public boolean isDiamond (int c)
    {
	if ( (c >=39) && (c <= 51) ) {
	    return true;
	}
	return false;
    }

}