import java.util.Scanner;

/* Java application having as its purpose to test the features of the
** TimeOfDay class.
**
** Author: R. McCloskey
*/
public class ToD_Tester {

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

   public static void main(String[] args) {
      
      TimeOfDay t = getToD("Specify a time of day ...");
      display("Initial time is ", t);

      System.out.println("\nTesting advanceOneMinute()...");
      testAdvanceOneMinute(t, 7);

      System.out.println("\n\nTesting retreatOneMinute()...");
      testRetreatOneMinute(t, 7);

      System.out.println("\n\nTesting toString24()...");
      System.out.println("In 24-hour mode, time is " + t.toString24());

      System.out.println("\n\nTesting isBetween()...");
      testIsBetween(t);

      System.out.println("\n\nTesting the setMode methods...");
      testSetMode(t);
   }


   /* Prints the given string (str) followed by the toString() and
   ** toString24() images of the given TimeOfDay object.
   */
   private static void display(String str, TimeOfDay tod) {
      System.out.print(str);  
      System.out.print(tod);  
      System.out.print(" (" + tod.toString24() + " in 24-hour mode)");
      System.out.println();
   }


   /* Prompts user to enter input describing a time of day and returns
   ** the TimeOfDay object that represents that time of day.
   */
   private static TimeOfDay getToD(String prompt) {
      System.out.println(prompt);
      int amOrPm = getInt("  Enter 1 for AM, any other number for PM: ");
      int h = getInt("  Enter hour (in range 1..12): ");
      int m = getInt("  Enter minute (in range 0..59): ");

      return new TimeOfDay(h, m, amOrPm != 1);
   }

   /* Invokes the advanceOneMinute() method on the given TimeOfDay object the
   ** specified number (k) of times.  After each time, the object is displayed.
   */
   private static void testAdvanceOneMinute(TimeOfDay tod, int k) {
      for (int i = 1; i <= k; i++) {
         tod.advanceOneMinute();
         display("After calling advanceOneMinute(), time is ", tod);
      } 
   }

   /* Invokes the retreatOneMinute() method on the given TimeOfDay object the
   ** specified number (k) of times.  After each time, the object is displayed.
   */
   private static void testRetreatOneMinute(TimeOfDay tod, int k) {
      for (int i = 1; i <= k; i++) {
         tod.retreatOneMinute();
         display("After calling retreatOneMinute(), time is ", tod);
      } 
   }

   /* Tests the isBetween() method by having the user specify two "new"
   ** times of day and then calling isBetween() to compare the three
   ** times of day in every possible way.
   */
   private static void testIsBetween(TimeOfDay tod) {
      TimeOfDay t2 = getToD("Specify a 2nd time of day...");
      System.out.println();
      TimeOfDay t3 = getToD("Specify a 3rd time of day...");

      System.out.println();
      testIsBetweenAux(tod, t2, t3);
      testIsBetweenAux(tod, t3, t2);
      testIsBetweenAux(t2, t3, tod);
      testIsBetweenAux(t2, tod, t3);
      testIsBetweenAux(t3, t2, tod);
      testIsBetweenAux(t3, tod, t2);
   }

   /* Reports the result of the call time.isBetween(start, stop).
   */
   private static void testIsBetweenAux(TimeOfDay time,
                                        TimeOfDay start,
                                        TimeOfDay stop) {

      System.out.print("Is " + time + " between " +
                       start + " and " + stop + "?");
      if (time.isBetween(start, stop)) { 
         System.out.println(" YES");
      }
      else {
         System.out.println(" NO");
      }
   }

   private static void testSetMode(TimeOfDay tod) {
      tod.setTo24Mode();
      System.out.println("Setting time to 24-hour mode...");
      System.out.println("now toString() yields " + tod);
      tod.setTo12Mode();
      System.out.println("\nSetting time back to 12-hour mode...");
      System.out.println("now toString() yields " + tod);
   }



   /* Displays the given prompt and returns the integer value that is entered
   ** in response at the keyboard.  If the response is not an integer, the 
   ** prompt is repeated until such time as a valid response is given.
   */
   private static int getInt(String prompt) {
      int result = -1;
      boolean keepGoing = true;
      while (keepGoing) {
         System.out.print(prompt);
         try {
            result = keyboard.nextInt();
            keepGoing = false;
         }
         catch (Exception e) {
            System.out.println("ERROR: Invalid non-integer response; try again\n");
         }
      } 
      return result;
   }
}