/* MMR_Tester.java
** Java application program that interacts with the user (at the keyboard) for
** the purpose of testing the MinMaxRecallCounter class, which is a child
** of Counter.
*/

import java.util.Scanner;

public class MMR_Tester {

   private static final char QUIT = 'q';
   private static final char INCREMENT = 'i';
   private static final char DECREMENT = 'd';
   private static final char SET_TO = 's';
   private static final char SET_TO_MIN = 'n';
   private static final char SET_TO_MAX = 'x';
   private static final char HELP = 'h';
   private static final String COMMANDS = "" + QUIT + INCREMENT + DECREMENT +
                                          SET_TO + SET_TO_MIN + SET_TO_MAX +
                                          HELP;

   private static Scanner keyBoard = new Scanner(System.in);

   public static void main(String[] args) {

      // Create a MinMaxRecallCounter object with initial value zero.
      MinMaxRecallCounter c = new MinMaxRecallCounter(0);

      char command = ' ';
      println("Initial counter value = " + c.countVal());
      printHelp();

      // Repeatedly apply operations to the counter in accord with
      // the commands entered by the user.
      while (command != QUIT) {
         try {
            print("\n>");
            command = keyBoard.next().charAt(0);
            test(c, command);
         }
         catch (Exception e) {
            e.printStackTrace(System.out);
            System.out.println();
         }
      }
   }


   /* Applies to the given MinMaxRecallCounter object the method 
   ** indicated by the given command code.
   */
   private static void test(MinMaxRecallCounter cntr, char command) 
   { 
      command = Character.toLowerCase(command);

      if (COMMANDS.indexOf(command) == -1) {
         println("Unrecognized command; try again:");
         printHelp();
      }
      else if (command == QUIT) {
         // do nothing
      }
      else if (command == HELP) {
         printHelp();
      }
      else {  // a valid command to modify the counter has been entered
         if (command == INCREMENT) {
            println("After incrementing:");
            cntr.increment();
         }
         else if (command == DECREMENT) {
            println("After decrementing:");
            cntr.decrement();
         }
         else if (command == SET_TO) {
            println("After setting to:");
            int k = keyBoard.nextInt(); 
            cntr.setTo(k);
         }
         else if (command == SET_TO_MIN) {
            println("After setting to historical min:");
            cntr.setToMin();
         }
         else if (command == SET_TO_MAX) {
            println("After setting to historical max:");
            cntr.setToMax();
         }
         System.out.printf("  Current value:  %d\n", cntr.countVal());
         System.out.printf("  Historical min: %d\n", cntr.minReached());
         System.out.printf("  Historical max: %d\n", cntr.maxReached());
      }
   }

   /* Prints instructions for the user.
   */
   private static void printHelp() {
      System.out.printf("  Type %c to quit, ", QUIT);
      System.out.printf("%c to increment, ", INCREMENT);
      System.out.printf("%c to decrement,\n", DECREMENT);
      System.out.printf("%c <num> to setTo, ", SET_TO);
      System.out.printf("%c to setToMin, ", SET_TO_MIN);
      System.out.printf("%c to setToMax,\n", SET_TO_MAX);
      System.out.printf("%c for this help\n", HELP);
   }


   /* Surrogate for the System.out.println() method.
   */
   private static void println(String s) { System.out.println(s); }

   /* Surrogate for the System.out.print() method.
   */
   private static void print(String s) { System.out.print(s); }

}