/*
* Morgage Application.  Calcualte the payments based on the amounts, terms and
* interest rates.  Show a list of the balance and the interest paid.
* Title     WK 3 Calculator
* author    Charles I. Clay
* Date      11/10/07
* version   1.0
*/

//Imports
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

//Create GUI fields, labels, and buttons
public class WK3Calculator extends JFrame implements ActionListener {
private JPanel panelAdder;
private JLabel labela;
private JLabel labelt;
private JLabel labelr;
private JTextField textFieldAmount;
private JTextField textFieldTerm;
private JTextField textFieldRate;
private JTextField textFieldResult;
private JButton buttonCalc;

public WK3Calculator() {
  initComponents();
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setVisible(true);
  pack();

  // Add Listeners
  buttonCalc.addActionListener(this);
}

public void initComponents() {
//Initialization of Components
panelAdder = new JPanel();
labela = new JLabel("Amount of Loan");
textFieldAmount = new JTextField();
labelt = new JLabel("Term of Loan");
textFieldTerm = new JTextField();
labelr = new JLabel("Interest Rate");
textFieldRate = new JTextField();
textFieldResult = new JTextField();
buttonCalc = new JButton("Calculate");

//Set Attributes
textFieldResult.setEditable(false);
textFieldResult.setColumns(8);
textFieldAmount.setColumns(6);
textFieldTerm.setColumns(2);
textFieldRate.setColumns(2);

Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());

//Addition of components to the panel
panelAdder.add(labela);
panelAdder.add(textFieldAmount);
panelAdder.add(labelt);
panelAdder.add(textFieldTerm);
panelAdder.add(labelr);
panelAdder.add(textFieldRate);
panelAdder.add(buttonCalc);
panelAdder.add(textFieldResult);

contentPane.add(panelAdder);
}

public static void main(String[] args) {
  WK3Calculator frame = new WK3Calculator();
}

private void setResultValue() {
   double amount = Double.parseDouble (textFieldAmount.getText());
   double term = Integer.parseInt(textFieldTerm.getText());
   double rate = Double.parseDouble(textFieldRate.getText()) / 100.;
   double result = amount * ( rate * Math.pow ( ( 1 + rate ), term ) ) / ( Math.pow( ( 1 + rate ), term ) - 1 );

   textFieldResult.setText(Double.toString(result));
}

public void actionPerformed(ActionEvent event) {
  System.out.println("Action Button");
  String command = event.getActionCommand();
  if (command == "Calculate") {
      setResultValue();
  }
}
}