/**
 * This class represents a standard playing card.
 * Cards have a rank and a suit. The possible ranks are 2, 3, 4, 5, 6, 7, 8, 9, 10
 * jack, queen, king, and ace. The possible suits are clubs, diamonds, hearts, and spades.
 * Objects of this class are immutable. Once a Card object is created its suit and value 
 * cannot be changed.
 */

public class Card implements{
    
    public static final int TWO = 0;
    public static final int THREE = 1;
    public static final int FOUR = 2;
    public static final int FIVE = 3;
    public static final int SIX = 4;
    public static final int SEVEN = 5;
    public static final int EIGHT = 6;
    public static final int NINE = 7;
    public static final int TEN = 8;
    public static final int JACK = 9;
    public static final int QUEEN = 10;
    public static final int KING = 11;
    public static final int ACE = 12;

    public static final int CLUBS = 0;
    public static final int DIAMONDS = 1;
    public static final int HEARTS = 2;
    public static final int SPADES = 3;

    private static final String[] ourRanks = {"2", "3", "4",
        "5", "6", "7", "8", "9", "10", "Jack",
        "Queen", "King", "Ace"};
    private static final String[] ourSuits = {"Clubs", "Diamonds", "Hearts", "Spades"};

    private int suit;
    private int rank;

    //constructors


    /**
     * Create a card with the specified rank and suit.
     * <br> pre: validSuit(suit), validRank(rank)
     * <br> post:   getRank() = rank, getSuit() = suit
     */
    public Card(int rank, int suit){   
        assert validSuit(suit) && validRank(rank) : "Failed precondition. validSuit(suit): "
            + validSuit(suit) + ", validRank(rank): " + validRank(rank) ;
        this.rank = rank;
        this.suit = suit;
    }
    
    //accessors

    /**
     * get this Card's rank.
     * <br>pre: none
     * post: returns this Card's rank
     * @return this Card's rank
     */
    public int getRank(){       
        return this.rank;    
    }

    /**
     * get this Card's suit.
     * <br>pre: none<br>
     * post: returns this Card's suit
     * @return this Card's suit
     */
    public int getSuit(){   
        return this.suit; 
    }

    /**
     * determine if a given int represents a valid rank for this classes' cards.
     * <br>pre: none<br>
     * <br>post: returns true if rank between TWO and ACE inclusive, false otherwise
     * @return returns true if rank between TWO and ACE inclusive, false otherwise
    **/
    public static boolean validRank(int rank){   
        return (TWO <= rank) && (rank <= ACE);    
    }

    /**
     * determine if a given int represents a valid suit for this classes' cards.
     * <br>pre: none<br>
     * <br>post: returns true if rank between CLUBS and SPADES inclusive, false otherwise
     * @return returns true if rank between CLUBS and SPADES inclusive, false otherwise
    **/
    public static boolean validSuit(int suit){
        return (CLUBS <= suit) && (suit <= SPADES); 
    }

    /**
     * check to see if two Cards are equal.
     * <br>pre: none
     * <br>post: return true if otherCard has the same suit and rank as this Card, false otherwise
     * @return return true if otherCard has the same suit and rank as this Card, false otherwise
     */
    public boolean equals(Object other){   
        Card otherCard = (Card)other;
        return this.suit == otherCard.suit && this.rank == otherCard.rank;
    }
    
    /**
     * return a string representation of this card.
     * <br>pre: none
     * <br>post: return a string representation of this card.
     * @return return a string representation of this card.
     */
    public String toString(){
        return ourRanks[getRank()] + " of " + ourSuits[getSuit()];  
    }
}