/** Card.java - Card class
 * Should we have a 'finished' attribute to indicate that the card is in its
 * final position, or should this detail be left elsewhere?
 */
public class Card
{
  private char denom;
  private char suit;

  // default constructor for blank card on the board
  // this is not null - null is used when there are no cards left in a shuffle
  public Card()
  {
    denom = ' ';
    suit = ' ';
  }

  public Card(char d, char s)
  {
    denom = d;
    suit = s;
  }

  public Card(Card c)
  {
    denom = c.denom;
    suit = c.suit;
  }

  public char getDenom()
  {
    return denom;
  }

  public char getSuit()
  {
    return suit;
  }

  // useful for finding dead spaces on the board - first find the kings
  public boolean isKing()
  {
    return denom == 'K';
  }

  public boolean isBlank()
  {
    return denom == ' ';
  }

  public String toString()
  {
    return denom + "-" + suit;
  }

  public boolean equals(Card c)
  {
    return denom == c.denom && suit == c.suit;
  }

  /** Find this card's successor.  If it's already a king, return null.
   */
  public Card succ()
  {
    if (denom == 'K')
      return null;
    char newSuit = suit;
    char newDenom;
    switch(denom)
    {
      case 'A': newDenom = '2'; break;
      case '9': newDenom = 'T'; break;
      case 'T': newDenom = 'J'; break;
      case 'J': newDenom = 'Q'; break;
      case 'Q': newDenom = 'K'; break;
      default : newDenom = (char) (1 + denom);
    }
    return new Card(newDenom, newSuit);
  }

  /** Similarly, the predecessor.  I'm not sure which function will be more useful.
   *  Note - we return null in the case of an ace which has no predecessor.
   */
  public Card pred()
  {
    if (denom == 'A')
      return null;
    char newSuit = suit;
    char newDenom;
    switch(denom)
    {
      case '2': newDenom = 'A'; break;
      case 'T': newDenom = '9'; break;
      case 'J': newDenom = 'T'; break;
      case 'Q': newDenom = 'J'; break;
      case 'K': newDenom = 'Q'; break;
      default : newDenom = (char) (denom - 1);
    }
    return new Card(newDenom, newSuit);
  }
}