/*
   Chapter 4:  Programming Assignment 6
   Programmer: Brad Shedd
   Date:       January 27, 2004
   Filename:   TrafficViolations.java
   Purpose:    Allows the clerks in the traffic court office to enter the actual speed limit, the speed at which the offender was travelling, and the number of previous tickets  the offender has received.
*/

import java.text.*;
import javax.swing.*;

public class TrafficViolations
{
   final static double FINE_PER_MILE = 10.0;
   final static double INITIAL_COURT_COST = 53.2;
   final static double PRIOR_OFFENSE_CHARGE = 20.0;
   final static int PRIOR_OFFENSE_LIMIT = 3;

   static boolean validResponse;

   static int speedLimit, priorViolations, actualSpeed;
   static double fine, courtCost, totalFine;

   public static void main(String[] args)
   {
      getInput();
      calculate();
      output();
   }// end main()

   public static void getInput()
   {
      // get the speed limit
      validResponse = false;
      while (!validResponse)
      {
         validResponse = true;
         try
         {
            speedLimit = Integer.parseInt(JOptionPane.showInputDialog(null,
                      "Enter the speed limit where the offense occured:  "));

            if (speedLimit <= 0) throw new NumberFormatException();
         }
         catch (NumberFormatException e)
         {
            error();
         }
       }

      // get the violator's speed
      validResponse = false;
      while (!validResponse)
      {
         validResponse = true;
         try
         {
            actualSpeed = Integer.parseInt(JOptionPane.showInputDialog(null,
                      "Enter the offender's speed:  "));
            if (actualSpeed <= 0) throw new NumberFormatException();
         }
         catch (NumberFormatException e)
         {
            error();
         }
      }

      // get the number of prior offenses
      validResponse = false;
      while (!validResponse)
      {
         validResponse = true;
         try
         {
            priorViolations = Integer.parseInt(JOptionPane.showInputDialog(null,
                          "Enter the number of prior offenses on record:  "));
            if (priorViolations < 0) throw new NumberFormatException();
         }
         catch (NumberFormatException e)
         {
            error();
         }
      }
   }// end getInput()

   public static void calculate()
   {
      if (actualSpeed > speedLimit)
      {
         fine = (actualSpeed - speedLimit) * FINE_PER_MILE;

         if (priorViolations > PRIOR_OFFENSE_LIMIT)
            priorViolations = PRIOR_OFFENSE_LIMIT;

         courtCost = INITIAL_COURT_COST + (priorViolations * PRIOR_OFFENSE_CHARGE);

         totalFine = fine + courtCost;
      }
   }// end calculate()

   public static void output()
   {
      DecimalFormat currency = new DecimalFormat("$###,###.00");

      String message = "The offender's fine for this offense is:  " + currency.format(totalFine);

      JOptionPane.showMessageDialog(null, message,
         "Traffic Violations", JOptionPane.PLAIN_MESSAGE);
   }// end output()

   public static void error()
   {
      JOptionPane.showMessageDialog(null, "Please enter a valid number!",
         "Invalid Input", JOptionPane.ERROR_MESSAGE);
      validResponse = false;
   }// end error()

}// end TrafficViolations class

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