AcesHighFunctional.java

import java.util.*;

/**
 * Aces High.  Functional Solution.
 * Sample Output: http://pastebin.com/raw.php?i=RN5UrCXY
 * @author jdalbey
 * @version Sep 2015
 */
public class AcesHighFunctional
{
    private Scanner scanner = new Scanner(System.in);
    private final static int kNumPiles = 4;
    /* The four piles of cards */
    private Stack<Integer>[] cardPiles;
    /* The deck of 52 playing cards */
    private Stack<Integer> deck;

    /** Construct the application */
    @SuppressWarnings("unchecked")
    public AcesHighFunctional()
    {
        // Initialize the card piles
        cardPiles = (Stack<Integer>[]) new Stack[kNumPiles];
    }

    /** Entry point for the application.
     * @param args ignored
     */
    public static void main(String[] args)
    {
        // Instantiate this class
        AcesHighFunctional app = new AcesHighFunctional();
        // See if a command line argument was given
        if (args.length != 0)
        {
            // Create deck from a single string of 52 card names with NO embedded blanks
            app.createDeckFromString(args[0]);
        }
        else
        {
            // create a random deck
            app.createRandomDeck();
        }
        // run the game
        app.run();
    }

    /** Play the game until the user quits or the game is over.  */
    public void run()
    {
        // Initialize the Piles of cards
        initPiles();
        // Deal four cards
        dealFour();
        // Show Welcome message
        System.out.println("See rules at: http://pastebin.com/raw.php?i=dhsNmQeq");
        System.out.println("Welcome to Aces High");
        // Display the table
        printTable();
        char userAction;
        boolean notDone = true;
        // repeat until game over
        do
        {
            // Display the prompt
            System.out.println("Enter pile number 1-4, D for draw, Mx for Move, or Q for quit");
            // Obtain user's turn
            String line = scanner.next();
            userAction = Character.toLowerCase(line.charAt(0));
            // IF User wants to draw THEN
            if (userAction == 'd')
            {
                // deal four cards
                notDone = dealFour();
            }
            // IF user wants to move a card THEN
            else if (userAction == 'm')
            {
                // Move a card to an empty space
                char choice = Character.toLowerCase(line.charAt(1));
                int pile = choice - '1';
                move(pile);
            }
            // IF user isn't quitting  THEN
            else if (userAction != 'q')
            {
                // assume user wants to discard from a given pile
                int pile = userAction - '1';
                discard(pile);
            }
            // Display table
            printTable();
        }
        while (userAction != 'q' && notDone);
        // Display score
        System.out.println("Your score is " + getScore());
    }

    /** Perform a discard.
     * @pile desired pile from which to discard the top card
     */
    public void discard(int pile)
    {
        // is legal pile number
        if (pile >= 0 && pile < kNumPiles)
        {
            // is it legal to discard the top card on this pile?
            if (canDiscard(pile))
            {
                // remove the top card from the pile
                removeTop(pile);
            }
        }
        else
        {
            System.out.println("Sorry, pile must be between 1 and 4.");
        }
    }
    /** Perform move to empty spot.
     * @param desired pile from which to move the top card
     */
    public void move(int pile)
    {
        // if the chosen pile is legal
        if (pile >= 0 && pile < kNumPiles)
        {
            // if there is an available spot
            if (canMove(pile) > -1)
            {
                // move the top card to the empty pile
                moveTop(pile);
            }
        }
        // ELSE show an error message
        else
        {
            System.out.println("Sorry, pile must be between 1 and 4.");
        }
    }
    /** Create the empty card piles */
    public void initPiles()
    {
        // Create four empty stacks of cards
        for (int pile = 0;  pile < cardPiles.length; pile++)
        {
            cardPiles[pile] = new Stack<Integer>();
        }
    }

    /** Deal one card from the deck onto each pile.
     * @return false if unable to deal all four cards.
     */
    public final boolean dealFour()
    {
        boolean result = true;
        // place a card on each pile from the deck
        try
        {
            cardPiles[0].push(dealCard());
            cardPiles[1].push(dealCard());
            cardPiles[2].push(dealCard());
            cardPiles[3].push(dealCard());
        }
        catch (EmptyStackException ex)
        {
            result = false;
        }
        return result;
    }

    /** See if the card on top of pileNum can be discarded.
     *  @param pileNum the number of the pile selected for discard.
     *  @pre 0 <= pileNum < 4
     *  @return true if there exists another visible card of the same suit
     *  with a higher rank than the top card of selected pile.
     */
    public boolean canDiscard(int pileNum)
    {
        boolean result = false;
        // is the chosen pile occupied?
        if (!cardPiles[pileNum].isEmpty())
        {
            int chosen = cardPiles[pileNum].peek();
            // consider each pile
            for (int pile = 0; pile < cardPiles.length; pile++)
            {
                // is another pile occupied?
                if (pile != pileNum && !cardPiles[pile].isEmpty())
                {
                    // is the visible card of the same suit and higher rank?
                    if (lessThan(chosen, cardPiles[pile].peek()))
                    {
                        // result is true
                        result = true;
                    }
                }
            }
        }
        // return result
        return result;
    }

    /** Remove the top card from selected pile.
     * @param pileNum selected pile
     * @pre cardPiles[pileNum].size() > 0
     */
    public void removeTop(int pileNum)
    {
        cardPiles[pileNum].pop();
    }

    /** See if the card on top of pileNum can be moved.
     *  @param pileNum the number of the pile selected for discard.
     *  @pre 0 <= pileNum < 4
     *  @return the available pilenumber, if it exists, otherwise -1
     */
    public int canMove(int pileNum)
    {
        int result = -1;
        // consider all the piles
        for (int pile = 0; pile < cardPiles.length; pile++)
        {
            // is there an empty pile?
            if (pile != pileNum && cardPiles[pile].isEmpty())
            {
                // store this pile as the one we want
                result = pile;
            }
        }
        // return target pile
        return result;
    }

    /** Move the top card from selected pile to an empty pile.
     * @param pileNum selected pile
     * @param emptyPile the pile number of the empty pile
     * @pre canMove(pileNum) > -1
     */
    public void moveTop(int pileNum)
    {
        cardPiles[canMove(pileNum)].push(cardPiles[pileNum].pop());
    }

    /** Compute the score; how many cards are left on the table.
     * @return the table score.
     */
    public int getScore()
    {
        int total = 0;
        // Accumulate the number of cards in each pile
        for (int pile = 0; pile < cardPiles.length; pile++)
        {
            total += cardPiles[pile].size();
        }
        return 52 - total;
    }

    /** Print the table. */
    public void printTable()
    {
        String result = "";
        // Get each pile in turn
        for (int pile = 0; pile < cardPiles.length; pile++)
        {
            String line = "";
            // Get each card from this pile
            for (Integer card: cardPiles[pile])
            {
                // Add this card's symbol to the line
                line = line + getCard(card) + ' ';
            }
            result += line + "\n";
        }
        // show the result
        System.out.println(result);
    }

    /**  Construct a deck of cards in random order. */
    public void createRandomDeck()
    {
        deck = new Stack<Integer>();
        // add 52 cards to the deck
        for (int card = 0; card <= 51; card++)
        {
            // pust this number onto the deck
            deck.push(new Integer(card));
        }
        // shuffle the deck
        Collections.shuffle(deck);
    }

    /**  Construct a deck of cards in the order specified.
    @param cardInput a string of 52 card abbreviations with no blanks,
    E.g., "2C5HTJ..."
     */
    public void createDeckFromString(String cardInput)
    {
        deck = new Stack<Integer>();
        for (int x = 0; x < cardInput.length(); x = x + 2)
        {
            char rank = cardInput.charAt(x);
            char suit = cardInput.charAt(x+1);
            int rankNum = rankSymbols.indexOf(rank);
            int suitNum = suitSymbols.indexOf(suit);
            int cardvalue = suitNum * 13 + rankNum;

            deck.push(cardvalue);
        }
    }

    /** Deal (remove and return) the top card from the deck.
     * @return the top card
     */
    public int dealCard()
    {
        return deck.pop();
    }

    /** Determine if the deck has no more cards.
     * @return true if the deck is empty.
     */
    public boolean isEmpty()
    {
        return deck.empty();
    }

    /*
     * Card represents one of the 52 cards in a
     * standard deck of playing cards.  Each card has a suit and a rank.
     * The card is represented as an integer between 0 and 51 inclusive.
     */
    //private final String suits = "CCCCCCCCCCCCCDDDDDDDDDDDDDSSSSSSSSSSSSSHHHHHHHHHHHHH";
    private final static String rankSymbols = "23456789TJQKA";
    private final static String suitSymbols = "CDSH";
    /** Accessor to the rank symbol of a card.
     *  @param card the card for which the rank is extracted
     */
    public char getRank(int card)
    {
        // ranks go from 2 to K then Ace, which correspond to ints 0 - 12.
        return rankSymbols.charAt(card % 13);
    }

    /** Accessor to the suit symbol of a card.
     *  @param card the card for which the suit is extracted
     */
    public char getSuit(int card)
    {
        return suitSymbols.charAt(card / 13);
    }

    /** Return a printable representation of this card.
     *  This implementation returns a 2 letter abbreviation.
     *  @return abbrevation of the card, e.g., "2C"
     */
    public String getCard(int card)
    {
        //return "" + getRank(card) + suits.charAt(card);
        return "" + getRank(card) + getSuit(card);
    }

    /** Does this card have the same suit and a lower rank
     * than Other card.
     * @param card1 first card to be compared
     * @param card2 other card to be compared
     * @return true if card1 is less than card2
     */
    public boolean lessThan(int card1, int card2)
    {
        boolean result = false;
        // Suits equal?
        if (getSuit(card1) == getSuit(card2))
        {
            // rank lower?
            if (card1 < card2)
            {
                // indicate it's good!
                result = true;
            }
        }
        // return result
        return result;
    }
    //"2C3C4C5C6C7C8C9CTCJCQCKCAC2D3D4D5D6D7D8D9DTDJDQDKDAD2H3H4H5H6H7H8H9HTHJHQHKHAH2S3S4S5S6S7S8S9STSJSQSKSAS"
    //"2C 3C 4C 5C 6C 7C 8C 9C TC JC QC KC AC 2D 3D 4D 5D 6D 7D 8D 9D TD JD QD KD AD 2H 3H 4H 5H 6H 7H 8H 9H TH JH QH KH AH 2S 3S 4S 5S 6S 7S 8S 9S TS JS QS KS AS "
}