// File: Date.cpp 
// Member function implementations for Date class
#include <iostream>
#include <sstream>
#include "Date.h"
#include <iomanip>
 

using namespace std;

// Initialize static member at file scope; 
// one class-wide copy.
const int 
   Date::days[] = { 0, 31, 28, 31, 30, 31, 30,31, 31, 30, 31, 30, 31 };

// Date constructor
Date::Date( int m, int d, int y ) 
{  setDate( m, d, y );}

Date::Date(const Date &d)
{  setDate(d.month,d.day,d.year);}


// Sets
// Set month. If value is out of range, set to default of 1   
void Date::setMonth(int mm)
{  month = (mm >= 1 && mm <= 12) ? mm : 1;
}

// Set day. If value is out of range, set to default of 1   
void Date::setDay(int dd)
{  // Test for a leap year to determine #days in Feb.
   if (month == 2 && leapYear())  // Feb in a leap year
      day = (dd >= 1 && dd <= 29) ? dd : 1;
   else
      day = (dd >= 1 && dd <= days[month]) ? dd : 1;
}

// Set year. If value is out of range, set to default of 2005
void Date::setYear(int yy)
{  year = (yy >= 1900 && yy <= 2100) ? yy : 2005;
}

// Return month
int Date::getMonth()
{  return(month); 
}

// Return day
int Date::getDay()
{  return(day);
}

// Return year
int Date::getYear()
{  return(year);
}

// Set the date
void Date::setDate(int mm, int dd, int yy )
{  setMonth(mm);
   setDay(dd);
   setYear(yy);
}

// Place date members into parameters
void Date::getDate(int &m,int &d,int &y)
{  m=getMonth();
   d=getDay();
   y=getYear();
}

// Add a specific number of days to a date; If days<0, does nothing
// Can you write a member function previous??
void Date::increment(int days)
{  for (int i = 0; i < days; i++ )
      helpIncrement();
}

// If the year in the data is a leap year, return true; 
// otherwise, return false
bool Date::leapYear()
{
   if ( year % 400 == 0 || ( year % 100 != 0 && year % 4 == 0 ) )
      return true;   // a leap year
   else
      return false;  // not a leap year
}

// If the year is a leap year, return true; 
// otherwise, return false
bool leapYear(int y)
{
   if ( y % 400 == 0 || ( y % 100 != 0 && y % 4 == 0 ) )
      return true;   // a leap year
   else
      return false;  // not a leap year
}

// Determine if the day is the end of the month
bool Date::endOfMonth()
{  if (month == 2 && leapYear())
      return day == 29; // last day of Feb. in leap year
   else
      return day == days[month];
}

// Function to help increment the date
void Date::helpIncrement()
{  if (endOfMonth() && month == 12) {  // end year
      day = 1;
      month = 1;
      ++year;
   }
   else if (endOfMonth()) {            // end month
      day = 1;
      ++month;
   }
   else       // not end of month or year; increment day
      ++day;
}

// Use for conversion from month to month's string rep; Why 13?
static string monthName[ 13 ] = { "", "January",
      "February", "March", "April", "May", "June",
      "July", "August", "September", "October",
      "November", "December" };

// Build string with date
string Date::getDateString()
{	// Build string to return
	ostringstream dayYear;
	dayYear << monthName[month] << ' ' << day << ", " << year;
	return(dayYear.str());
}