/*
   Chapter 4:  W/T Applet (Sales Commission)
   Programmer: Brad Shedd
   Date:    May 03, 2006
   Filename:   CommissionApplet.java
   Purpose: This applet calculates sales commission using a sales amount
            (input by the user) and a sales code (chosen from among option buttons).
*/

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

public class CommissionApplet extends Applet implements ItemListener
{
  //declare variables and construct a color
   double dollars, answer;
   int empCode;
   Image dollarSign;
   Color darkRed = new Color(160, 50, 0);

   //Create components for applet
   Label promptLabel = new Label("Enter the sales amount (do not use commas or dollar signs):");
      TextField salesField = new TextField(20);

   Label codeLabel = new Label ("Select the appropriate commission code:");

   CheckboxGroup codeGroup = new CheckboxGroup();
      Checkbox telephoneBox = new Checkbox("Telephone Sales",false,codeGroup);
      Checkbox inStoreBox = new Checkbox("In-Store Sales",false,codeGroup);
      Checkbox outsideBox = new Checkbox("Outside Sales",false,codeGroup);
      Checkbox hiddenBox = new Checkbox("",true,codeGroup);

   Label outputLabel = new Label("Click an option button to calculate the sales commission.");

   public void init()
   {
      setBackground(darkRed);
      setForeground(Color.white);
      add(promptLabel);
      add(salesField);
      salesField.requestFocus();
      salesField.setForeground(Color.black);
      add(codeLabel);
      add(telephoneBox);
      telephoneBox.addItemListener(this);
      add(inStoreBox);
      inStoreBox.addItemListener(this);
      add(outsideBox);
      outsideBox.addItemListener(this);
      add(outputLabel);
   }

   //This methos is triggered by the user clicking an option button.
   public void itemStateChanged(ItemEvent choice)
   {
      try
      {
         dollars = getSales();
         empCode = getCode();
         answer = getComm(dollars,empCode);
         output(answer, dollars);
      }

      catch (NumberFormatException e)
      {
         outputLabel.setText("You must enter a dollar amount greater than zero.");
         hiddenBox.setState(true);
         salesField.setText("");
        salesField.requestFocus();
      }
   }

   public double getSales()
  {
      double sales = Double.parseDouble(salesField.getText());

      if (sales <= 0) throw new NumberFormatException();

      return sales;
   }

   public int getCode()
   {
      int code = 0;
      if (telephoneBox.getState()) code = 1;
      else
         if (inStoreBox.getState()) code = 2;
         else
            if (outsideBox.getState()) code = 3;
      return code;
   }

   public double getComm(double sales, int code)
   {
      double commission = 0.0;
      switch(code)
      {
         case 1:
            commission = .10 * sales;
            break;

         case 2:
            commission = .14 * sales;
            break;

         case 3:
            commission = .18 * sales;
            break;
      }
      return commission;
   }

   public void output(double commission, double sales)
   {
      DecimalFormat twoDigits = new DecimalFormat("$#,000.00");
      outputLabel.setText("Your commission on sales of " + twoDigits.format(sales) + " is " + twoDigits.format(commission));
   }

   public void paint(Graphics g)
   {
      dollarSign = getImage(getDocumentBase(), "dollarSign.gif");
      g.drawImage(dollarSign,12,28,this);
   }

}

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