/* An instance of this class represents a time of day, precise to the
** minute.  Example: 5:34PM.
**
** Author: R. McCloskey
** Date: Feb. 2026
*/
public class TimeOfDay {

   // class constants
   // ---------------

   protected int HOUR_CEILING = 12;
   protected int MINUTES_PER_HOUR = 60;
   protected int MINUTES_PER_HALF_DAY = HOUR_CEILING * MINUTES_PER_HOUR;

   // instance variables
   // ------------------

   protected boolean isAM;  // true if this time is before noon
   protected int hour;      // # hours since either midnight or noon,
                            // depending upon the value of isAM
   protected int minute;    // # minutes since beginning of this hour

   // class invariant:  0 <= hour < HOUR_CEILING
   // class invariant:  0 <= minute < MINUTES_PER_HOUR


   // constructor
   // -----------

   /* Initializes this time of day to be that described by the
   ** three parameters.
   ** pre: 0 <= h < 12 && 0 <= m < 60
   */
   public TimeOfDay(int h, int m, boolean AM) {
      this.isAM = AM;  this.hour = h;  this.minute = m;
   }


   // observers
   // ---------

   @Override
   public String toString() {
      String AM_PM_Str = isAM ? "AM" : "PM";
      return String.format("%d:%02d%s", hour, minute, AM_PM_Str);
   }

   /* Returns how many minutes past midnight is this time of day.
   */
   public int minutesSinceMidnight() {
      // compute # of hours since either midnight (if AM) or noon (if PM)
      int hoursPastThreshold = hour % HOUR_CEILING;

      // compute # of hours since midnight
      int hoursPastMidnight; 
      if (isAM) 
         { hoursPastMidnight = hoursPastThreshold; }
      else 
         { hoursPastMidnight = hoursPastThreshold + HOUR_CEILING; }

      return hoursPastMidnight * MINUTES_PER_HOUR  +  minute;
   }


   // mutators (none)
   // --------

   

}