//ProjectEuler/C++/Headers/Problem19.hpp
//Matthew Ellison
// Created: 09-28-18
//Modified: 07-14-19
//How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?
/*
You are given the following information, but you may prefer to do some research for yourself.
1 Jan 1900 was a Monday.
Thirty days has September,
April, June and November.
All the rest have thirty-one,
Saving February alone,
Which has twenty-eight, rain or shine.
And on leap years, twenty-nine.
A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.
*/
//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/myClasses
/*
	Copyright (C) 2019  Matthew Ellison

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program 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 Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef PROBLEM19_HPP
#define PROBLEM19_HPP


#include <cinttypes>
#include <string>
#include "Problem.hpp"


class Problem19 : public Problem{
private:
//Variables
	//An easier way to return the days
	enum DAYS {SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, NUMBER_OF_DAYS, ERROR};
	static unsigned int START_YEAR;	//The start year
	static unsigned int END_YEAR;	//The stop year
	uint64_t totalSundays;	//Keep track of the number of sundays
//Functions
	//Return the day of the week that the date you pass into it is on
	DAYS getDay(unsigned int month, unsigned int day, unsigned int year);
	//Returns true if the year passed to it is a leap year
	bool isLeapYear(unsigned int year);
public:
	Problem19();
	virtual void solve();
	virtual std::string getString() const;
	virtual void reset();
	//Returns the total sundays that were asked for
	uint64_t getTotalSundays() const;
};
/* Results
There are 171 Sundays that landed on the first of the months from 1901 to 2000
It took 4.579 milliseconds to solve this problem.
*/

#endif //PROBLEM19_HPP