import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;

/* Java application that "exercises" the classes in the "Coin class hierarchy".
**
** Author: R. McCloskey
** Date: January 2024
*/
public class CoinTester {

   private static Scanner input; 
   private static boolean echo;

   public static void main(String[] args) {
      establishInput(args.length == 0 ? null : args[0]);

      System.out.println("Welcome to the CoinTester program.\n");

      int seed = getInt("Enter seed: "); 
      int numTosses = getInt("Enter # times to toss coins: ");
      int headPercent = getInt("Enter HEADS probability as an int percent: ");
      double headProb = headPercent / 100.0;

      // Create an array of three coin objects, one from each of the three
      // classes in the "Coin hierarchy".
      Coin[] coins = new Coin[] { new Coin(seed),
                                  new BiasedCoin(seed, headProb),
                                  new BiasedCoinWithCounts(seed, headProb) 
                                };
      
      // Toss each coin the specified # of times; after each toss, report its
      // current state (using the String returned by its toString() method).
      for (int i=1; i <= numTosses; i++) {
         for (int j = 0; j != coins.length; j++) {
            coins[j].toss();
            System.out.printf("\nAfter %d tosses, coin[%d]:\n%s\n", 
                              i, j, coins[j]);
         }
      }

      System.out.println("\nGoodbye from the CoinTester program.");


   }


   /* Assigns to the 'input' Scanner object the intended source of
   ** input data.  If the given string provides the name of a file,
   ** that file will be the input source.  Otherwise the input source
   ** will be the keyboard.
   */
   private static void establishInput(String fileName) {
      if (fileName == null) {
         input = new Scanner(System.in);
         echo = false;
      }
      else {
         try {
            input = new Scanner(new File(fileName));
         }
         catch (FileNotFoundException e) {
            e.printStackTrace(System.out);
            System.out.println("Program aborting");
            System.exit(0);
         }
         echo = true;
      }
   }

   /* Displays the given prompt and returns the integer response, as
   ** read by the 'input' Scanner.
   */
   private static int getInt(String prompt) {
      int result;
      System.out.print(prompt);
      result = input.nextInt();
      if (echo) { System.out.println(result); }
      return result;
   }
}