// simpledate.cpp


#include "simpledate.h"


//////////////////////////////////////////////////////////////////////
// constructors

// "default constructor"; constructs an invalid date
SimpleDate::SimpleDate() 
{
  month = 0;
  day = 0;
  year = 0;
}


SimpleDate::SimpleDate(int newMonth, int newDay, int newYear) 
{
  month = newMonth;
  day = newDay;
  year = newYear;
}


//////////////////////////////////////////////////////////////////////
// methods

// returns true iff (if and only if) this date is a valid calendar
// date; *doesn't account for true start of Gregorian calendar
bool SimpleDate::isValid() 
{
  if (month < 1 || month > NUM_MONTHS ||            // check months
      day < 1 || day > daysInMonth(month, year) ||  // check day
      year < 1) {		                    // check year*
    return false;
  }
	
  return true;
}


// "accessor" method
int SimpleDate::getMonth() 
{
  return month;
}


// "accessor" method
int SimpleDate::getDay() 
{
  return day;
}


// "accessor" method
int SimpleDate::getYear() 
{
  return year;
}


// returns true iff this date comes before the given date d
bool SimpleDate::isBefore(SimpleDate d) 
{
  if (year == d.year) {
    if (month == d.month) {
      // same year, same month if control reaches here
      return (day < d.day);
    } else {
      // same year, different months if control reaches here
      return (month < d.month);
    }
  }

  // years are different if control reaches here 
  return (year < d.year);
}


// returns number of days in given month in given year, accounting for
// Februaries in leap years
int SimpleDate::daysInMonth(int m, int y) 
{
  int days = monthLengths[m - 1]; 

  // if leap year...
  if (year % 4 == 0 && 
      (!(year % 100 == 0) || (year % 400 == 0))) {
    // ...February has 29 days
    if (m == 2) {
      return days + 1;
    }
  }

  return days;
}