import java.util.Scanner;

/* Java application that is for the purpose of illustrating how to use an
** instance of the PairOfDice class to simulate the rolling of a pair of dice.
**
** One integer input is needed.  If a command line argument is provided,
** that is taken to be the input value.  Otherwise, the user is prompted
** to enter one.  The input is used to seed the pseudo-random number
** generators that produce pseudo-random dice roll results.
**
** Author: R. McCloskey
** Last Modified: November 2, 2022
*/

public class DiceApp {

   public static void main(String[] args) {
      int seed;
      if (args.length == 0) 
         { seed = readInt("Enter an integer-valued seed: "); }
      else 
         { seed = Integer.parseInt(args[0]); }

      // Create a new pair of dice, using the just-established seed (for 
      // pseudo-random number generation).
      PairOfDice dice = new PairOfDice(seed);

      // Now roll the dice several times, each time reporting the result.
      for (int i=1; i<=10; i=i+1) {
         dice.roll();
         // Report the result of the roll:
         System.out.print("Dice roll result is " + dice.toString());
         System.out.print("; Sum is " + dice.getSum());
         System.out.print("  First die: " + dice.getNumPips(1));
         System.out.print(", Second die: " + dice.getNumPips(2));
         System.out.println();
      } 
      System.out.println("Goodbye.");
   }

   /* Prints the given string and returns the response provided at the
   ** keyboard, which must be interpretable as an integer.
   */
   private static int readInt(String prompt) {
      System.out.print(prompt);
      Scanner keyboard = new Scanner(System.in);
      return keyboard.nextInt();
   }

}