/** A playing card annotated with discussion of Java syntax
 * 
 * @author Williams Lenhart
 * @version 1997
 *
 */
public class Card extends AbsCard {  // automatically implements CardInterface
	
	// instance variables
	private Suit theSuit;	// The suit of the card: CLUBS..SPADES
	private Rank theRank;	// The rank of the card: TWO..ACE
	
	// Constructors
	
	/** This version of the constructor does all of the work
	 * @param aRank -- rank of the card to be constructed
	 * @param aSuit -- suit of the card to be constructed
	 * Constructs a card of the given type
	 */
	public Card(Rank aRank, Suit aSuit) {
		theSuit = aSuit;
		theRank = aRank;
	}
	
	/** 
	 * Good idea to have a no-operand constructor
	 * constructs an ace of spades.
	 */
	public Card() {
		this(Rank.ACE,Suit.SPADES);
	}
	
	/**
	 * Having this method allows Cards to be used in certain data structures
	 * For now, just try to return different values for different cards
	 * This returns a number in the range 0..51;  
	 * different cards yield different values
	 * @return  returns simple hash code for this card
	 */
	public int hashCode() {
		return 13*(theSuit.ordinal()) + theRank.ordinal();
	}
	
	/**
	 * @return suit of card
	 */
	public Suit getSuit() {
		return theSuit;
	}
	
	/**
	 *  @return rank of card
	 */
	public Rank getRank() {
		return theRank;
	}
	
	// If a class contains a main method, that method can be run when 
	// the class is compiled
	// I always have one, which I use for testing the class
	public static void main(String[] args) {
		// Create some cards
		CardInterface first = new Card(Rank.THREE,Suit.DIAMONDS);
		CardInterface second = new Card();
		
		System.out.println();
		System.out.println(first);
		System.out.println(second);
		System.out.println();
		
		// Note:  ! is the negation operator
		System.out.print("These cards are ");
		if(!first.equals(second)) {
			System.out.print("not ");
		}
		System.out.println("equal");
		System.out.println();
		
		// Create an array of cards
		// Note syntax for array declaration
		CardInterface[] hand = new CardInterface[5];
		hand[0] = new Card(Rank.ACE,Suit.HEARTS);
		hand[1] = new Card(Rank.KING,Suit.HEARTS);
		hand[2] = new Card(Rank.QUEEN,Suit.HEARTS);
		hand[3] = new Card(Rank.JACK,Suit.HEARTS);
		hand[4] = new Card(Rank.TEN,Suit.HEARTS);
		
		// for loop
		// Note: declaration in for loop; ++ is the "add 1" operator
		for(int i=0;i<4;i++) {
			System.out.print(hand[i] + ", ");
		}
		System.out.println();
		
		// new for loop from Java 5
		for(CardInterface card:hand){
			System.out.print(card + ", ");			
		}
	}

}