package proj3;

public class Time implements Comparable {
   
   private int hour;
   private int minute;
   private boolean valid;
   
   
   public Time(int hour, int minute) {
      this.hour = hour;
      this.minute = minute;
      valid = (hour >= 0) && (hour < 24) && (minute >= 0) && (minute < 60);
   }
   
   public int getHour() {
      return hour;
   }
   
   public int getMinute() {
      return minute;
   }
   
   public boolean isValid() {
      return valid;
   }
   
   public Time add(int duration) {
      if (!valid || (duration < 0))
         return new Time(0,-1);
      int newHour = hour;
      int newMinute = minute + duration;
      if (newMinute >= 60) {
         newHour += newMinute/60;
         newMinute = newMinute % 60;
      }
      return new Time(newHour, newMinute);
   }
   
   // uses 12-hour format, 12 am is midnight, 12 pm is noon
   // note: no specification of what it does if the time is invalid
   public String toString() {
      String ampm = "am";
      if (hour >= 12)
         ampm = "pm";
      int displayHour = hour;
      if (displayHour == 0)
         displayHour = 12;
      else if (displayHour > 12)
         displayHour -= 12;
      String displayMinute = ""+minute;
      if (displayMinute.length() == 1)
         displayMinute = "0" + displayMinute;
      return displayHour + ":" + displayMinute + " " + ampm;
   }
   
   public int compareTo(Object other) {
      Time otherTime = (Time)other;
      if (hour != otherTime.hour)
         return hour - otherTime.hour;
      return minute = otherTime.minute;
   }
   
   

}