package Semester1;

/*
 Program: mortgage7.Java
 Programmer: Yonatan Mishan
 Date: 12-08-18
 version: 7.0
 This program uses a GUI to read term rate and principal from a file. And
 calculate monthly payment. add a menu option to calculate preset term and rate.
 */
//imports
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Formatter;
import java.util.Scanner;
import java.io.*;


public class Mortgage7 extends JFrame implements ActionListener {
    // creating the labels and buttons
    FlowLayout flow = new FlowLayout();
    JFrame frame = new JFrame("Menu");
    //creating the labels and menu bar

    JMenuBar jmb = new JMenuBar();
    JMenu menu = new JMenu("Menu");
    JMenuItem m7 = new JMenuItem("7 year at 5.35%");
    JMenuItem m15 = new JMenuItem("15 year at 5.50%");
    JMenuItem m30 = new JMenuItem("30 year at 5.75%");

    JLabel labelPrincipal = new JLabel("Principal: ");
    JTextField textPrincipal = new JTextField(5);
    JLabel space1 = new JLabel("                     ");

    JLabel labelRate = new JLabel("Rate: ");
    JTextField textRate = new JTextField(5);
    JLabel space2 = new JLabel("                     ");

    JLabel labelTerm = new JLabel("Enter your term: ");
    JTextField textTerm = new JTextField(5);
    JLabel space3 = new JLabel("                     ");

    JMenu action = new JMenu("Actions");
    JMenuItem Calculate = new JMenuItem("Calculate!");
    JMenuItem Reset = new JMenuItem("Reset");
    JMenuItem Exit = new JMenuItem("Exit");

    JLabel MonthlyPaymentLabel = new JLabel("Your monthly payment is: ");
    JTextArea Payment = new JTextArea("");

    Scanner s;

    String text = "";

    public Mortgage7() { // constructor
        super("Mortgage Calculator");
        try {
            s = new Scanner(new File("rates.txt"));
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Container con = getContentPane();
        con.setLayout(flow);
        frame.setJMenuBar(jmb);
        con.add(jmb);
        jmb.add(menu);
        jmb.add(action);
        con.add(labelPrincipal);
        con.add(textPrincipal);
        con.add(space1);
        con.add(labelRate);
        con.add(textRate);
        con.add(space2);
        con.add(labelTerm);
        con.add(textTerm);
        con.add(space3);
        con.add(MonthlyPaymentLabel);
        con.add(Payment);
        con.add(Calculate);
        con.add(Reset);
        con.add(Exit);
        menu.add(m7);
        menu.add(m15);
        menu.add(m30);
        action.add(Calculate);
        action.add(Reset);
        action.add(Exit);
        //adding action listeners.
        m7.addActionListener(this);
        m15.addActionListener(this);
        m30.addActionListener(this);
        Calculate.addActionListener(this);
        Reset.addActionListener(this);
        Exit.addActionListener(this);

        monthlyFromFile();
    }// end constructor

    public static void main(String[] args) {// main method
        Mortgage7 temp = new Mortgage7();
        temp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// close on x
        temp.setSize(1000, 600);// frame size
        temp.setVisible(true);// make GUI visible
    }// end main


public static double getMonthlyPayment(double time, double rate, double principle) {
    time = time* 12;
    rate = rate / 1200.0;
    double monthlyPayment = principle * rate / (1.0 - Math.pow(rate + 1, -time)); // calculating the principal.
    return monthlyPayment;
}

//gets all monthly payments from file
public void monthlyFromFile() {
    //read all lines
        text += "FILE DATA:  ";
        while(s.hasNext()) {
            String line[] = new String[4];
            for(int i = 0; i < line.length; i++) {
                line[i] = s.next();
            }
            text += getMonthlyPayment(Double.parseDouble(line[0]),Double.parseDouble(line[3].substring(0, line[3].length() - 2)), 2) + "\n";
        }
        Payment.setText(text);
}

public void actionPerformed(ActionEvent e) {
    String source = e.getActionCommand();

    // setting Calculate button and calculating monthly payment from the user inputs
    if (source == "7 year at 5.35%") {
        textRate.setText("7");
        textTerm.setText("5.35");
    } else if (source == "15 year at 5.50%") {
        textRate.setText("15");
        textTerm.setText("5.50");
    } else if (source == "30 year at 5.75%") {
        textRate.setText("30");
        textTerm.setText("5.75");
    } else if (source == "Calculate!") {
        String Principal = textPrincipal.getText();
        String Rate = textRate.getText();
        String Term = textTerm.getText();
        double p = Double.parseDouble(Principal);
        double r = Double.parseDouble(Rate);
        double t = Double.parseDouble(Term);
        try { //try exception
            if (t >= 10 && t <= 40 && p >= 5000 && p <= 1000000) { //boundries
                double MonthlyPayment = getMonthlyPayment(t,r,p); // calculating the principal.
                for (int i = 1; i <= 360; i++) { // start loop for the number of payments

                    double interest_paid = p * r;
                    double princPaid = MonthlyPayment - interest_paid;
                    p = p - princPaid;
                    // add info to string
                    text += String.format("Month " + i + " "
                            + "MonthlyPayment: $%.2f Interest Paid: $%.2f Princ Paid: $%.2f principal: $%.2f\n ",
                            MonthlyPayment, interest_paid, princPaid, p);
                }

            } else {
                //throw new ("TERM IS OUT OF BOUNDS! "); //set exception error massage
            }
        } catch (Exception e1) {
            text += String.format(e1.getMessage());
        }
        Payment.setText(text); // print string

    } else if (source == "Reset") { // reseting all the text
        textRate.setText("");
        textPrincipal.setText("");
        textTerm.setText("");
        Payment.setText("");
    } else { // exiting the program
        System.exit(0);
    } // end else
}// end actionPerformed

}//end class