//Name: Gary Hesselbrock
//Date: 01-31-2016
//Assignment: HW#2 Mortgage Calculator
//Description: This program gets loan, rate, and years from the user and then outputs the monthly and total due.
//Version 3.0

#include <iostream>
#include <cmath>
#include <iomanip>
#include <Windows.h>
using namespace std;

class MortgagePayment
{
private:
	double loan, rate, years, term, InterestPaid, PrincipalPaid, balance;

public:
	//default constructor
	MortgagePayment()
	{
		loan = 0; rate = 0; years = 0; term = 0;
	}

	//set and get functions
	void setLoan(double l) { loan = l; }
	void setRate(double r) { rate = r; }
	void setYears(double y) { years = y; }
	void setTerm(double t) { term = t; }
	double getMonthlyDue();
	double getTotalDue();
	double getInterestPaid();
	double getPrincipalPaid();
	double getBalance();
};

double MortgagePayment::getMonthlyDue()
{
	//monthly amount due is calculated
	return ((loan * (rate / 12) * term) / (term - 1));
}

double MortgagePayment::getTotalDue()
{
	//total amount due is calculated
	return (getMonthlyDue() * 12 * years);
}

double MortgagePayment::getInterestPaid()
{
	//interest paid is calculated
	return (balance * ((rate * 100) / 1200));
}

double MortgagePayment::getPrincipalPaid()
{
	//principal paid is calculated
	return (getMonthlyDue() - getInterestPaid());
}

double MortgagePayment::getBalance()
{
	//balance is calculated
	return (balance - getPrincipalPaid());
}

int main()
{
	MortgagePayment mortgage;
	double loan, rate, years, term, balance;
	int monthCounter = 1;

	//the loan amount is taken from the user
	cout << "Please enter the loan amount: ";
	while (!(cin >> loan) || loan < 0)
	{
		cout << "The loan amount cannot be negative. Please enter a positive value: ";
	}
	mortgage.setLoan(loan);

	//the interest rate is taken from the user
	cout << "Please enter the interest rate: ";
	while (!(cin >> rate) || rate < 0)
	{
		cout << "The interest rate cannot be negative. Please enter a positive value: ";
	}
	//input rate value is converted
	rate = rate / 100;
	mortgage.setRate(rate);

	//the year amount is taken from the user
	cout << "Please enter the year amount: ";
	while (!(cin >> years) || years < 0)
	{
		cout << "The year amount cannot be negative. Please enter a positive value: ";
	}
	mortgage.setYears(years);

	//term is calculated
	term = pow((1 + (rate / 12)), (12 * years));
	mortgage.setTerm(term);


	//output calculations
	cout << endl << "The monthly payment amount is $" << fixed << setprecision(2) << mortgage.getMonthlyDue() << endl;
	cout << "The total payment amount is $" << mortgage.getTotalDue() << endl;

	balance = loan;

	for (double i = 12 * years; i > 0; --i)
	{
		double x = mortgage.getInterestPaid();
		double y = mortgage.getPrincipalPaid();
		double z = mortgage.getBalance();
		cout << monthCounter++ << setw(10) << "$" << x << setw(10) << "$" << y << setw(10) << "$" << z << endl;
	}
}