// Fig. 9.6: BasePlusCommissionEmployee.java
// BasePlusCommissionEmployee class represents an employee who receives
// a base salary in addition to commission.
public class BasePlusCommissionEmployee {
   private final String firstName;
   private final String lastName;
   private final String socialSecurityNumber;
   private double grossSales; // gross weekly sales
   private double commissionRate; // commission percentage
   private double baseSalary; // base salary per week

   // six-argument constructor
   public BasePlusCommissionEmployee(String firstName, String lastName, 
      String socialSecurityNumber, double grossSales, 
      double commissionRate, double baseSalary) {
      // implicit call to Object's default constructor occurs here

      // if grossSales is invalid throw exception
      if (grossSales < 0.0) {
         throw new IllegalArgumentException("Gross sales must be >= 0.0");
      }     

      // if commissionRate is invalid throw exception
      if (commissionRate <= 0.0 || commissionRate >= 1.0) {
         throw new IllegalArgumentException(
            "Commission rate must be > 0.0 and < 1.0");
      }     

      // if baseSalary is invalid throw exception
      if (baseSalary < 0.0) {                                             
         throw new IllegalArgumentException("Base salary must be >= 0.0");
      }                                                                   

      this.firstName = firstName;
      this.lastName = lastName;
      this.socialSecurityNumber = socialSecurityNumber;
      this.grossSales = grossSales;
      this.commissionRate = commissionRate;
      this.baseSalary = baseSalary;
   } 

   // return first name
   public String getFirstName() {return firstName;}

   // return last name
   public String getLastName() {return lastName;}

   // return social security number
   public String getSocialSecurityNumber() {return socialSecurityNumber;}

   // set gross sales amount
   public void setGrossSales(double grossSales) {
      if (grossSales < 0.0) {
         throw new IllegalArgumentException("Gross sales must be >= 0.0");
      }     

      this.grossSales = grossSales;
   } 

   // return gross sales amount
   public double getGrossSales() {return grossSales;}

   // set commission rate
   public void setCommissionRate(double commissionRate) {
      if (commissionRate <= 0.0 || commissionRate >= 1.0) {
         throw new IllegalArgumentException(
            "Commission rate must be > 0.0 and < 1.0");
      }     

      this.commissionRate = commissionRate;
   } 

   // return commission rate
   public double getCommissionRate() {return commissionRate;}

   // set base salary                            
   public void setBaseSalary(double baseSalary) {                         
      if (baseSalary < 0.0) {                                             
         throw new IllegalArgumentException("Base salary must be >= 0.0");
      }                                                                   
                                                                          
      this.baseSalary = baseSalary;                                       
   }                                                                      

   // return base salary                             
   public double getBaseSalary() {return baseSalary;}

   // calculate earnings
   public double earnings() {
      return baseSalary + (commissionRate * grossSales);
   } 

   // return String representation of BasePlusCommissionEmployee
   @Override
   public String toString() {
      return String.format(
         "%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f%n%s: %.2f", 
         "base-salaried commission employee", firstName, lastName,
         "social security number", socialSecurityNumber,
         "gross sales", grossSales, "commission rate", commissionRate, 
         "base salary", baseSalary);
   }
} 


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