// monthviewgen.cpp - Xestia Calendar month view generation functions.
//
// (c) 2016 Xestia Software Development.
//
// This file is part of Xestia Calendar.
//
// Xestia Address Book is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by the
// Free Software Foundation, version 3 of the license.
//
// Xestia Address Book is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with Xestia Calendar. If not, see <http://www.gnu.org/licenses/>

#include "monthviewgen.h"

using namespace std;

int PreviousMonthNumberofDays(int Month, int Year){
	
	// Work out what the previous month is.
	
	// Return 31 if month matches.
	
	if (Month == 1 || Month == 2 || Month == 4 || 
		Month == 6 || Month == 8 || Month == 9 || Month == 11){
	
		return 31;
			
	}
	
	// Return 30 if month matches.
	
	if (Month == 5 || Month == 7 || Month == 10 || Month == 12){
		
		return 30;
		
	}
	
	// Work out if year is a leap year and return 28 or 29
	// for february.
	
	if (Year % 4 == 0){
		
		if (Year % 100 == 0){
			
			if (Year % 400 == 0){
			
				return 29;
				
			} else {
				
				return 28;
				
			}
			
		}
		
		return 29;
		
	} else {
		
		return 28;
		
	}
	
}