//ProjectEuler/ProjectEulerCPP/Source/Problem1.cpp
//Matthew Ellison
// Created: 07-10-19
//Modified: 07-09-20
//What is the sum of all the multiples of 3 or 5 that are less than 1000
//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/myClasses
/*
	Copyright (C) 2020  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/>.
*/


#include <string>
#include <sstream>
#include <cinttypes>
#include <vector>
#include "Stopwatch.hpp"
#include "../Headers/Problem.hpp"
#include "../Headers/Problem1.hpp"


//The highest number to be tested
uint64_t Problem1::MAX_NUMBER = 999;

//Constructor
Problem1::Problem1() : Problem("What is the sum of all the multiples of 3 or 5 that are less than 1000?"), fullSum(0){
}

//Operational functions
//Solve the problem
void Problem1::solve(){
	//If the problem has already been solved do nothing and end the function
	if(solved){
		return;
	}
	//Start the timer
	timer.start();

	//Step through every number < 1000 and see if either 3 or 5 divide it evenly
	for(uint64_t cnt = 1;cnt <= MAX_NUMBER;++cnt){
		//If either 3 or 5 divides it evenly then add it to the vector
		if((cnt % 3) == 0){
			fullSum += cnt;
		}
		else if((cnt % 5) == 0){
			fullSum += cnt;
		}
	}

	//Stop the timer
	timer.stop();

	//Throw a flag to show the problem is solved
	solved = true;
}

//Reset the problem so it can be run again
void Problem1::reset(){
	Problem::reset();
	fullSum = 0;
}


//Gets
//Return a string with the solution to the problem
std::string Problem1::getString() const{
	//If the problem hasn't been solved throw an exception
	if(!solved){
		throw unsolved();
	}
	//Create a string with the results and return it
	std::stringstream results;
	results << "The sum of all the numbers < " << MAX_NUMBER + 1 << " that are divisible by 3 or 5 is " << fullSum;
	return results.str();
}

uint64_t Problem1::getSum() const{
	//If the prblem hasn't been solved throw an exception
	if(!solved){
		throw unsolved();
	}
	return fullSum;
}