// Note: An improved version of this program is CounterTester.java.
/* CounterTester_F18.java
** Java application program that interacts with the user (at the keyboard) for
** the purpose of testing the various classes in the Counter class hierarchy.
*/

import java.util.Scanner;
import java.io.IOException;

public class CounterTester_F18 {

   private static final char QUIT = 'q';
   private static final char INCREMENT = 'i';
   private static final char DECREMENT = 'd';
   private static final char RESET = 'r';
   private static final char SET_TO = 's';
   private static final char HELP = 'h';

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

   public static void main(String[] args) throws IOException  {

      Counter c = null;
      String responseStr;
      int response;
      int counterKind, init = 0, min = 0, max = 0; 

      println("Welcome to the Counter Tester program!");
      println("");
      println("Enter the kind of Counter to test:");
      println("  (1) (plain) Counter");
      println("  (2) Resetable Counter");
      println("  (3) RollOver Counter");
      println("  (4) Stopping Counter");
      println("  (5) Warning Counter");
       
      counterKind = keyBoard.nextInt();
      if (3 <= counterKind  &&  counterKind <= 5) {
         print("Enter minimum bound: ");
         min = keyBoard.nextInt();
         print("Enter maximum bound: ");
         max = keyBoard.nextInt();
      }
      print("Enter initial count value: ");
      init = keyBoard.nextInt();

      if (counterKind == 1) { c = new Counter(init); }
      else if (counterKind == 2) { c = new ResetableCounter(init); }
      else if (counterKind == 3) { c = new RollOverCounter(init, min, max); }
      else if (counterKind == 4) { 
         println("A line of code in CounterTester_F18 program must be\n" +
                 "un-commented to allow testing of a StoppingCounter.");
         //c = new StoppingCounter(init, min, max);
      }
      else if (counterKind == 5) { 
         println("A line of code in CounterTester_F18 program must be\n" +
                 "un-commented to allow testing of a WarningCounter.");
         //c = new WarningCounter(init, min, max); 
      }
      else { println("Illegal response"); }

      testLoop(c);
   }

   /* Repeatedly applies operations to the given Counter object,
   ** according to the commands entered by the user.
   */

   private static void testLoop(Counter c) // throws IOException
   {
      char command = ' ';
      println("Initial counter value = " + c.countVal());
      printHelp();
      while (command != QUIT) {
         try {
            print(">");
            command = keyBoard.next().charAt(0);
            test(c, command);
         }
         catch (Exception e) {
            e.printStackTrace(System.out);
            System.out.println();
         }
      }
   }


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

      if (command == QUIT) {
         // do nothing
      }
      else if (command == INCREMENT) {
         print("Incrementing to ");
         cntr.increment();
         println( "" + cntr.countVal());
      }
      else if (command == DECREMENT) {
         print("Decrementing to ");
         cntr.decrement();
         println( "" + cntr.countVal());
      }
      else if (command == RESET) {
         if (cntr instanceof ResetableCounter) {
            print("Resetting to ");
            ((ResetableCounter) cntr).reset();
            println( "" + cntr.countVal());
         }
         else { 
            println("This Counter does not support the reset operation!");
         }
      }
      else if (command == SET_TO) {
         print("Setting to ");
         int k = keyBoard.nextInt(); 
         cntr.setTo(k);
         println( "" + cntr.countVal());
      }
      else if (command == HELP) {
         printHelp();
      }
      else {
         println("Unrecognized command; try again:");
         printHelp();
      }
   }

   /* Prints instructions for the user.
   */
   private static void printHelp() {
      println("  Type i to increment, d to decrement, r to reset,\n" +
              "  s <num> to setTo, q to quit, and h for this 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); }

}