/** An instance of this class represents a pair of (fair) six-sided dice,
**  such as are commonly used in board games (e.g., Monopoly).
**
**  Author: R. McCloskey
**  last modified: 2022-11-2
*/

public class PairOfDice {

   // instance variables (fields/attributes)
   // --------------------------------------

   private Die die1,die2;


   // constructor 
   // -----------

   /* Initializes this pair of dice's fields/attributes.
   */
   public PairOfDice() {
      die1 = new Die();  die2 = new Die();
   }

   /* Initializes this pair of dice's fields/attributes, using the 
   ** given seed in establishing each die in the pair of dice. 
   */
   public PairOfDice(int seed) {
      int seed1 = 13*seed - 5;
      int seed2 = -6*seed + 11;
      die1 = new Die(seed1);  die2 = new Die(seed2);
      System.out.printf("New pair of dice seeded with %d...\n", seed);
   }


   // observers
   // ---------

   /* Returns the number of pips "showing") on die #k 
   ** (where k must be either 1 or 2).
   ** pre-condition: 1<=k<=2 (or else IllegalArgumentException is thrown)
   */
   public int getNumPips(int k) { 
      if (k == 1) 
         { return die1.getNumPips(); }
      else if (k == 2)
         { return die2.getNumPips(); }
      else {
         throw new IllegalArgumentException("k = " + k + " out of range");
      }
   }

   /* Returns the sum of the number of pips showing on the two dice.
   */
   public int getSum() { 
      return die1.getNumPips() + die2.getNumPips();
   }


   /* Returns the # of times that this pair of dice has been rolled
   ** during its "lifetime".
   */
   public int getRollCount() { return die1.getRollCount(); }


   /* Returns a string containing each die's current face value inside
   ** a pair of square brackets.
   */
   public String toString() { 
      return "[" + die1.toString() + die2.toString() + "]"; 
   }


   // mutators
   // --------

   /* Rolls this pair of dice.
   */
   public void roll() { die1.roll();  die2.roll(); }

}