/*An instance of this class represents an Employee who is paid every week
   by the hour. Overtime hours paid at 1.5 times the hourly pay rate.
   Constructors
      HourlyEmployee()  //Create a new HourlyEmployee paid at Minimum-Wage
      HourlyEmployee(double rate)   //Create a new HourlyEmployee
                                    //paid at a given hourly rate
   Accessors
      double getPayRate()
      double getTotalHours()
   Mutators
      void setPayRate(double rate)
      void addHours(double hours)
      void resetHours()
   Other Methods
      double grossPay()
*/
public class HourlyEmployee
{
   //Class Constants
   public static final double MINIMUM_WAGE = 10.00;
   public static final int HOURS_LIMIT = 40;
   
   //Instance (State) Variables
   private double payRate;    //Hourly Pay-Rate
   private double totalHours; //Total Hours Worked in the Week
   
   //Constructor: Create a new Minimum_Wage HourlyEmployee 
   public HourlyEmployee()
   {
      this.setPayRate(MINIMUM_WAGE); 
      this.resetHours();
   }
      
   //Constructor: Create a new HourlyEmployee paid at a given pay-rate
   // @param payRate: The employee's hourly pay-rate
   public HourlyEmployee(double payRate)
   {
      this.setPayRate(payRate); 
      this.resetHours();
   }

   //Accessor -
   // @return: this HourlyEmployee's hourly pay-rate
   public double getPayRate()
   {
      return this.payRate;
   }
   
   //Accessor -
   // @return this HourlyEmployee's total hours for the week
   public double getTotalHours()
   {
      return this.totalHours;
   }
   
   //Mutator -
   // Update an HourlyEmployee's hourly pay-rate
   public void setPayRate(double rate)
   {
      this.payRate = rate < MINIMUM_WAGE ? MINIMUM_WAGE : rate;
   }
   
   
   //Mutator -
   // Update an HourlyEmployee's total hours for the week
   // @param hours: # hours to add to this HourlyEmployee's total hours
   public void addHours(double hours)
   {
      if (hours < 0.0)
         throw new RuntimeException("Invalid Hours: " + hours);
         
      this.totalHours = this.totalHours + hours;
   }
   
   //Mutator -
   // Clear an HourlyEmployee's total hours to 0
   public void resetHours()
   {
      this.totalHours = 0.0;
   }
   
   // @return this HourlyEmployee's gross pay for all hours worked
   public double grossPay()
   {
      return this.totalHours * this.payRate + overtimePay();
   }
   
   public String toString()
   {
      return "HOURLYEMPLOYEE Rate: $" + this.payRate + "/Hr. " +
             this.totalHours + " Hours";
   }

   //Helper -
   // @return this HourlyEmployee's overtime pay
   //          0.0 if total hours < 40   
   private double overtimePay()
   {
      if (this.totalHours <= HOURS_LIMIT)
         return 0.0;
         
      return (this.totalHours - HOURS_LIMIT) * 0.5 * this.payRate;
   }
}