import java.util.ArrayList;
import java.util.Random;

/**
 * A DeckOfCards object represents a standard deck of 52 playing cards.
 * 
 * @author Dave Reed 
 * @version 11/25/04
 */
public class DeckOfCards
{
    private ArrayList deck;

    /**
     * Creates a deck of 52 cards in order.
     */
    public DeckOfCards()
    {
        deck = new ArrayList();
        
        String suits = "SHDC";
        String ranks = "23456789TJQKA";
        for (int s = 0; s < suits.length(); s++) {
            for (int r = 0; r < ranks.length(); r++) {
                Card c = new Card(ranks.charAt(r), suits.charAt(s));
                deck.add(c);
            }
        }
    }

    /**
     * Shuffles the deck so that the locations of the cards are random.
     */
    public void shuffle()
    {
        Random randy = new Random();
        
        for (int c = deck.size()-1; c > 0; c--) {
            int swapIndex = randy.nextInt(c+1);
            
            Card tempCard = (Card)deck.get(c);
            deck.set(c, deck.get(swapIndex));
            deck.set(swapIndex, tempCard);
        }
    }
   
    /**
     * Deals a card from the top of the deck, removing it from the deck.
     *   @return the card that was at the top (i.e., end of the ArrayList)
     */
    public Card dealCard()
    {
        return (Card)deck.remove(deck.size()-1);
    }
    
    /**
     * Adds a card to the bottom of the deck.
     *   @param c the card to be added to the bottom (i.e., the beginning of the ArrayList)
     */
    public void addCard(Card c)
    {
        deck.add(0, c);
    }
    
    /**
     * @return the number of cards remaining in the deck
     */
    public int cardsRemaining()
    {
        return deck.size();
    }
    
    
}