/*
AUTHOR: KODY SNYDER
DATE: 2/23/2017
COURSE: CSCI 111
TITLE: CAR LOAN PAYMENT CALCULATOR
 */
package carpayment;

import java.util.*;

public class CarPayment {


    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);

        // Variable declarations
        String name;
        double loan;
        double monthly = 0;
        double rate;
        double months;
        double payment = 0;

        // Obtain user input for Loan, Interest Rate, and Month Terms
        System.out.println("What is your name?");
        name = kb.nextLine();

        System.out.println("Enter loan amount: ");
        loan = kb.nextDouble();

        System.out.println("Enter annual interest rate: ");
        rate = kb.nextDouble();

        System.out.print("Enter amount of months on loan term: ");
        months = kb.nextDouble();

        monthlyRate(rate, monthly); // Call MonthlyRate
        monthly = monthlyRate(rate, monthly); // Assign Monthly the value

        monthlyPayment(rate, months, loan, monthly, payment); // call MonthlyPayment
        payment = monthlyPayment(rate, months, loan,monthly, payment); // Assign Payment the value

        calculationOutput(loan, rate, months, monthly, payment); // call CalculationOutput, outputting information

        kb.close(); // Close Scanner

    }

    // Method to find Monthly Interest Rate
    public static double monthlyRate(double rate, double monthly) {
        monthly = (rate / 12);
        return monthly;
    }

    public static double monthlyPayment(double rate, double months, double monthly, double loan, double payment) {
        payment = ((monthly*Math.pow(1 + monthly, months))/(Math.pow(1 + monthly, months) -1));
        return payment;
    }

    public static void calculationOutput(double loan, double rate, double monthly, double months, double payment) {

        System.out.println("Car Loan Monthly Payment Calculator");
        System.out.printf("%16s%16s%16s%16s%16s%n", "Amount Borrowed", "Annual Rate",
                 "Monthly Rate", "Length of Loan", "Monthly Payment" );
        System.out.printf("%16.0f%16.0f%16.0f%16.0f%16.0f%n", loan, rate, monthly,
        months, payment);

    }
}