#include <iostream>    
#include <iomanip>		
#include <string>		
#include <limits>		
#include <cmath>
#include <fstream>
#include <stdlib.h>	      
using namespace std;	
 
 
class MortgageCal   
{    
	private:    
	double intYear;    
	double intMonth;    
	double loanAmt;    
	double term;        
	double numMonths;   
	double paymentAmt;     
	double balance;    
	double principleAmt;
	double loanBal;
 
	public:  
		MortgageCal(  
		double intYear = 0,   
		double term = 0,  
		double loanAmt = 0,  
		double paymentAmt = 0,  
		double numMonths = 0,  
		double intMonth = 0,  
		double balance = 0,  
		double principleAmt = 0,  
		double loanBal = 0):
 
		intYear(intYear),  
		term(term),  
		loanAmt(loanAmt),  
		paymentAmt(paymentAmt),  
		numMonths(),  
		intMonth(),  
		balance(),  
		principleAmt(),  
		loanBal(){ }
 
		double getnumMonths() 
		{ 
			return term * 12; 
		}  
 
		bool setnumMonths(double months) 
		{  
			if (months > 0) 
			{ 
				term = months/12; 
			}
 
			else 
			{ 
				return false; 
			}
 
			return true;  
		} 
 
		double getTermInYears() { return term; }  
		bool setTermInYears(double years) 
		{   
			if (years > 0) 
			{ 
				term = years; 
			}  
 
			else 
			{ 
				return false; 
			}  
 
			return true;  
		}  
 
		double getPrinciple() 
		{ 
			return principleAmt;
		}  
 
		bool setPrinciple(double principle)
		{  
			if (principle >= 0) 
			{ 
				principleAmt = principle; 
			}
 
			else 
			{ 
				return false; 
			}  
 
			return true;  
 
		}  
 
 
		double getLoanAmount()
		{ 
			return loanAmt; 
		}  
 
		bool setLoanAmount(double loan)  
		{  
				if (loan >= 0) 
				{ 
					loanAmt = loan; 
				}
 
				else 
				{ 
					return false; 
				}
 
				return true;  
		}  
 
		double getYearlyRate()
		{ 
			return intYear; 
		}
 
		bool setYearlyRate(double rate) 
		{ 
			intYear = rate;   
			return true;
		}
 
		double getPaymentAmount() 
		{ 
			return paymentAmt; 
		}
 
		bool setPaymentAmount (double payment) 
		{ 
			return true;
		}
 
		double getLoanBalance() 
		{ 
			return loanBal;
		}  
 
		bool setLoanBalance(double loanB)
		{  
			if (loanB >= 0) 
			{ 
				loanBal = loanBal-principleAmt; 
			}
 
			else 
			{ 
				return false; 
			}  
 
			return true;  
		}
 
		double getInterestMonth() 
		{ 
			return intMonth = (intYear/1200);
		}
 
		bool setInterestMonth(double interest)
		{    
			return true;  
		}
 
		void Amortization();
		void Schedule();
		void caseSchedule();
		void enterLoanAmts();		  
 
};
 
double getRangedInput(const string prompt, double min, double max, int tries = 5);  
void pause();
int menu = 0;  
 
double getRangedInput(const string prompt, double min, double max, int tries) 
{  
	int userTry = 0;  
	double userInVal = 0;  
	bool isValidInput;  
	do 
	{  
		cout << prompt << ": ";  
		cin >> userInVal;  
		if (!cin.good()) 
		{
			cout <<endl;
			cout << "INPUT ERROR: Please input a proper number!" << endl;  
			cin.clear();  
			cin.ignore(numeric_limits<streamsize>::max(), '\n');  
			isValidInput = false;  
		}
 
		else 
		{  
			isValidInput = (userInVal >= min && userInVal <= max);  
		}  
 
		if (!isValidInput) 
		{  
			cout << "Please enter a value between " << min << " and " << max << "!" << endl;  
			cout << endl;
		}
 
	} while (!isValidInput && ++userTry < tries);
 
	if (userTry == tries) 
	{  
		cout << "User input invalid, can not process!" << endl;  
		exit(1);
	}  
 
	return userInVal;  
 
}
 
void MortgageCal::Schedule()
{
	int intPymtNum = 1; 
	int max = 0; 
	double intRate; 
	double intPayment;  
	double principleAmt; 
	double loanBal; 
 
	cout << endl  << "This is a breakdown of how much of your payment is applied to interest and the balance of your loan: " << endl;  
	system ( "PAUSE" );  
 
	cout << endl << endl;
	cout << " Payment" << setw(15) << "Interest" << endl;  
	cout << " Number " << setw(15) << "  Paid  " << setw(14) << "balance " << endl;  
	cout << " _______" << setw(15) << "________"  << setw(14) << "________" << endl;
 
	loanBal = loanAmt; l		
	cout.setf(ios::fixed);      
	cout.setf(ios::showpoint);  
	cout.precision(2);			
 
	for(int i = 1, max = 1; intPymtNum <= numMonths; i++)
	{
		intRate = intMonth;
		intPayment = loanBal * intRate; 
		principleAmt = paymentAmt - (loanBal * intRate); 
		loanBal = loanBal - principleAmt; 
 
		if (loanBal <= 0) 
		{ 	
			loanBal = 0;
		} 
 
		cout << endl << setw(5) << intPymtNum << setw(17) << intPayment << setw(15) << loanBal; 
		intPymtNum++; 
		max++; 
 
		if (max == 20)
		{   
			cout << endl;
			system ( "PAUSE" ); 
			max = 1;
			cout << endl << endl;
			cout << " Payment" << setw(15) << "Interest" << endl; 
			cout << " Number " << setw(15) << " Paid " << setw(14) << "balance " << endl; 
			cout << " _______" << setw(15) << "________" << setw(14) << "________" << endl;
		}
	}
}
 
void pause() 
{	
	cout << "Press enter to continue...";  
	cin.ignore(numeric_limits<streamsize>::max(), '\n');
	cin.ignore();  
}  
 
void MortgageCal::Amortization() 
{  
	numMonths = term * 12;      
	intMonth = intYear/1200;    
	paymentAmt = (loanAmt*intMonth)/(1-pow(1+intMonth,-numMonths)); 
}  
 
void MortgageCal::caseSchedule()
{
	int checklist = 0;		
	int choice=0;			
	int ary;				
 
	int iarray[3] = {0};
	float farray[3] = {0.0F};
	ifstream in("calculations.txt");
	in >> iarray[0] >> iarray[1] >> iarray[2];
	in >> farray[0] >> farray[1] >> farray[2];
 
	do
	{
		cout<<"\n------Loan Menu Items------";
		cout<< "\n1) 7 years at 5.25%  \n2) 15 years at 5.5%  \n3) 30 years at 5.75%\n-------------------------\nEnter (1-3)";
		cin >> choice;
		checklist = 0;		
 
		if(choice <= 0)		
		{
			cout<<"\n\n\n";			
			cout<<"\n\nError! Please enter only 1, 2, or 3 to select the term and rate\n";
			checklist = 1;
		}
 
		else if(choice == 1)
		{
			ary=0;
		}
 
		else if(choice == 2)		
		{
			ary=1;
		}
 
		else if (choice ==3)		
		{
			ary=2;
		}
 
		else if (choice > 3)
		{
			cout<<"\n\n\n";
			cout<<"\n\nError! Please enter only 1, 2, or 3 to select the term and rate\n";
			checklist = 1;
		}
 
		cout<<"Please enter the Loan Amount:$";
			cin >> loanAmt;
	} while (checklist == 1);
 
	numMonths = (iarray[ary] * 12);			
	intMonth = (farray[ary]/1200);		
	paymentAmt = (loanAmt*intMonth)/(1-pow(1+intMonth,-numMonths)); 
 
	cout << "After Amortinzation:\n" << endl << "Your payments will be: $" << paymentAmt; 
 
	MortgageCal::Schedule();
}
 
void MortgageCal::enterLoanAmts()
{
	double loanAmount;
	double yearlyRate;
 
	MortgageCal morgCalc;
	char indicator = ('y', 'Y')
	while ((indicator =='y') || (indicator == 'Y')) 
	{	      
		loanAmount = getRangedInput("Please enter the loan amount", 0, numeric_limits<double>::max());
		term = getRangedInput("\nPlease enter the loan term in years", 0, 10000);  
		yearlyRate = getRangedInput("\nPlease enter the yearly interest rate", 0, 100);
		cout << endl;
		morgCalc.setLoanAmount(loanAmount);  
		morgCalc.setTermInYears(term);  
		morgCalc.setYearlyRate(yearlyRate);  
 
		morgCalc.Amortization(); 
 
		cout << "After Amortinzation:\n" << endl;
		cout <<  "Your payments will be: $" << morgCalc.getPaymentAmount(); 
 
   		morgCalc.Schedule();
		cout << endl;
		pause(); 
		cout << endl;			
 
		cout << "Do you want to enter another value (enter y to continue or n to end)? "; 
		cin >> indicator;		
 
	}
 
	cout << endl;
	cout << "\"Thank you for using our mortgage calculator\"" << endl;
	cout << endl;
 
	pause();
}
 
int main() 
{  
	double loanAmount;		
	double term;			
	double numMonths;
	double intMonth;
	double paymentAmt;
	char indicator;
 
	MortgageCal morgCalc;	
 
	do
	{
		system("cls");
		cout << endl << "\"Welcome to our Mortgage Calculator!\"";
		cout << "\n\n-------- Main Menu ---------";
		cout << "\n  1. Would you like to enter rate and term   ";
		cout << "\n  2. Would you like to select loan from menu ";
		cout << "\n----------------------------\n";
		cout << "Press 1 or 2: ";
		cin >>menu;
 
		if (menu == 1)
		{
			morgCalc.enterLoanAmts();
		}
		else if (menu == 2)
		{
			morgCalc.caseSchedule();
		}
 
		cout<< "\nEnter another loan (y)es or (n)o):";
		cin>>indicator;
 
	} while(indicator == 'y');
 
	return 0;
 
}