/*Author: Stephen Marsh
  Date: 2/13
  Description:  MIS 225 Hands on Exam, computes payment owed using
                the ComputePayment class
*/

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;

public class Payment_Marsh extends Applet implements ActionListener{
  //create three labels
  private Label prompt1;
  private Label prompt2;
  private Label prompt3;

  //create three input textfields
  private TextField inputField1;
  private TextField inputField2;
  private TextField inputField3;

  //create result label and fields
  private TextField resultField;
  private Label resultLabel;
  private String resultStr;

  private Button button;
  private boolean buttonClicked;  //tells program when to paint frog image
  private Image frogImage; 

  public void init(){
    prompt1 = new Label("Enter the amount borrowed:");
    prompt2 = new Label("Enter the annual interest rate:");
    prompt3 = new Label("Enter the number of years:");
    
    inputField1 = new TextField(10);
    inputField1.setEditable (true);
    inputField2 = new  TextField(10);
    inputField2.setEditable(true);
    inputField3 = new TextField(10);
    inputField3.setEditable(true);

    resultLabel = new Label("The Maturity Value is:");
    resultField = new TextField(10);
    resultField.setEditable (false);

    button = new Button("Calculate the Payment Value");
    button.addActionListener(this);

    add(prompt1);
    add(inputField1);
    add(prompt2);
    add(inputField2);
    add(prompt3);
    add(inputField3);
    add(resultLabel);
    add(resultField);
    add(button);

    frogImage = getImage(getCodeBase(),"frog_funny.gif");
    setSize(300,300);
  }//init

    public double convertStringToDouble(String s){
      Double doubleObject = Double.valueOf(s);
      return doubleObject.doubleValue();
    }//convert

    public void actionPerformed(ActionEvent e){
        //store principal and convert to double
      String inputString = inputField1.getText();
      double principal = convertStringToDouble(inputString);
        //store interest rate and convert to double
      inputString = inputField2.getText ();
      double rate = convertStringToDouble(inputString);
        //store years and convert to double
      inputString = inputField3.getText();
      double years = convertStringToDouble(inputString);

        //create a ComputePayment object and have it compute the payment
      ComputePayment compPay = new ComputePayment();
      double payment = compPay.calcPayment(principal,rate,years);

      NumberFormat dollars = NumberFormat.getCurrencyInstance ();
      resultStr = dollars.format (payment); //convert payment to currency formated string
      resultField.setText (resultStr);
      buttonClicked = true;  //establish that the button has been clicked
      repaint();
    }//actionPerformed

   public void paint(Graphics g) {
      if(buttonClicked)
        g.drawImage(frogImage,20,120,this);

    }//paint
}//MaturityAppletPaint