/**
Name: Brandon Altuchow
ID: 0207256
Date: 9/23/17
Description: Assignment 16 - JButtons & TextFields
 */
package howmuch;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;

public class HowMuch extends JFrame implements ActionListener{
    Container content = this.getContentPane();
    JTextField tfAmount = new JTextField();
    JTextField tfInterest = new JTextField();
    JTextField tfYears = new JTextField();
    JLabel lblPayment = new JLabel();
    JLabel lblTotCost = new JLabel();
    JButton bCalc = new JButton("Calculate");

    public HowMuch(){
        this.setVisible(true);
        this.setSize(350, 300);
        this.setTitle("How Much?");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        content.setLayout(new GridLayout(6,2));
        content.add(new JLabel("Amount of Purchase"));
        content.add(tfAmount);
        content.add(new JLabel("Interest Rate [like 7.5]"));
        content.add(tfInterest);
        content.add(new JLabel("Years To Pay"));
        content.add(tfYears);
        content.add(new JLabel("Monthly Payment"));
        content.add(lblPayment);
        content.add(new JLabel("Total Purchase Cost"));
        content.add(lblTotCost);
        content.add(bCalc);
        bCalc.addActionListener(this);
    }
    public void actionPerformed(ActionEvent ae){
        String strAmount = tfAmount.getText();
        String strInterest = tfInterest.getText();
        String strYears = tfYears.getText();

        double dblAmount = Double.parseDouble(strAmount);
        double dblInterest = Double.parseDouble(strInterest);
        double dblYears = Double.parseDouble(strYears);

        dblInterest /= 100;
        dblInterest /= 12;
        double payment = (dblAmount*dblInterest)/(1 - Math.pow(1/(1+dblInterest),dblYears*12));
        double total = payment*12*dblYears;

        NumberFormat fmt = NumberFormat.getCurrencyInstance();
        lblPayment.setText("" + fmt.format(payment));
        lblTotCost.setText("" + fmt.format((total)));
    }
    public static void main(String[] args) {
        HowMuch gui = new HowMuch();
    }
}