/*
===================================================================
Author:
Title:
Date: 5/11/19
Description: Program which calculates total carbon footprint based on
			 values inputed by user
===================================================================
*/

#include <iostream>
#include <iomanip>
#include "carbonFootprint.hpp"
	using namespace std;

//declaring functions.
double transportationFootprint(double KmPerDay, double efficiency);
double electricityFootprint(double kWhPerMonth, int numPeople);
double foodFootprint(double meat, double dairy, double fv, double carb);
double totalFootprint(double trans, double elec, double food);

int main() {
	std::cout << std::fixed;
    std::cout << std::setprecision(2);

    //declaring varables for transportationFootprint
	double KmPerDay, efficiency;
	//declaring variables for foodFootprint
    double kWhPerMonth;
    int numPeople;
    //declaring variables for calculating foodFootprint
    double meat, dairy, fv, carb;
    //declaring variables for values of footprint of each type and total footprint
    double trans, elec, food, total;

    //Transportation footprint
    cout << "How many km do you drive in one day? ";
    cin >> KmPerDay;
    cout << "Choose the appropriate fuel efficiency for your car: \n";
	cout << "\tvery small car: 7.1 km/L\n";
	cout << "\tsmall car: 8.2 km/L\n";
	cout << "\tsports car: 14.9 km/L\n";
	cout << "\tSUV: 12.3 km/L\n";
	cout << "Or, if you know the efficiency rating, choose another number: ";
	cin >> efficiency;

	trans = transportationFootprint(KmPerDay,efficiency);
	cout <<"Your Carbon footprint with respect to car use is " << trans <<"kg/year.\n";

	//Electricity footprint
	cout <<"What is the average electricity consumption per month, in kilowatts? ";
	cin >> kWhPerMonth;

	cout <<"How many people live in the house: ";
	cin >> numPeople;

	elec = electricityFootprint(kWhPerMonth, numPeople);
	cout <<"Your carbon footprint with respect to electricity use is " << elec <<" kg/year.\n";

	//Food footprint
	cout <<"Of all the food you eat, what percent consists of meat or fish? ";
	cin >> meat;

	cout <<"Of all the food you eat, what percent consists of dairy products? ";
	cin >> dairy;

	cout <<"Of all the food you eat, what percent consists of fruit or vegetables? ";
	cin >> fv;

	cout <<"Of all the food you eat, what percent consists of carbohydrates? ";
	cin >> carb;

	food = foodFootprint(meat, dairy, fv, carb);
	cout <<"Your carbon footprint with respect to food consumption is " << food <<" kg/year\n" << endl;

	//Total footprint
	total = totalFootprint(trans, elec, food);
	cout <<"You produce an annual total of " << total << " metric tons of CO2 per year";

	return 0;
}

double transportationFootprint(double KmPerDay, double efficiency){
	double kgCO2;
	double LitersPerYear = 365 * (KmPerDay / efficiency);
	kgCO2 = 2.3 * LitersPerYear;
	return kgCO2;
}

double electricityFootprint(double kWhPerMonth, int numPeople){
	double kgCO2;
	kgCO2 = (kWhPerMonth * 12 * 0.257) / numPeople;
	return kgCO2;
}

double foodFootprint(double meat, double dairy, double fv, double carb) {
	double kgCO2;
	kgCO2 = ((meat/100) * 53.1) + ((dairy/100) * 13.8) + ((fv/100) * 7.6) + ((carb/100) * 3.1);
	return kgCO2;
}

double totalFootprint(double trans, double elec, double food) {
	double kgCO2;
	kgCO2 = (trans + elec + food)/1000;
	return kgCO2;
}