from decimal import Decimal

class CommissionEmployee:
    """
    An employee who gets paid a commission based on gross sales.
    """
    def __init__(self, first_name, last_name, ssn, 
                 gross_sales, commission_rate):
        """
        Construct a CommissionEmployee object.
        @param first_name the employee's first name.
        @param last_name the employee's last name.
        @param ssn the employee's SSN.
        @param gross_sales the employee's gross sales..
        @param commission_rate the employee's commission rate.
        """
        self._first_name = first_name
        self._last_name = last_name
        self._ssn = ssn
        self.gross_sales = gross_sales          # validate via property
        self.commission_rate = commission_rate  # validate via property

    @property
    def first_name(self):
        return self._first_name

    @property
    def last_name(self):
        return self._last_name

    @property
    def ssn(self):
        return self._ssn

    @property
    def gross_sales(self):
        return self._gross_sales

    @gross_sales.setter
    def gross_sales(self, sales):
        """
        Set the gross sales or raise ValueError if invalid.
        @param sales the gross sales.
        """
        if sales < Decimal('0.00'):
            raise ValueError('Gross sales must be >= to 0')
        
        self._gross_sales = sales
        
    @property
    def commission_rate(self):
        return self._commission_rate

    @commission_rate.setter
    def commission_rate(self, rate):
        """
        Set commission rate or raise ValueError if invalid.
        @param rate the commission rate.
        """
        if not (Decimal('0.0') < rate < Decimal('1.0')):
            raise ValueError(
               'Interest rate must be greater than 0 and less than 1')
        
        self._commission_rate = rate

    def earnings(self):
        """
        @return the employee's earnings.
        """   
        return self.gross_sales * self.commission_rate

    def __repr__(self):
        """
        @return the string representation of an CommissionEmployee object.
        """
        return ('CommissionEmployee: ' + 
            f'{self.first_name} {self.last_name}\n' +
            f'social security number: {self.ssn}\n' +
            f'gross sales: ${self.gross_sales:,.2f}\n' +
            f'commission rate: {self.commission_rate:.2f}')

##########################################################################
# (C) Copyright 2019 by Deitel & Associates, Inc. and                    #
# Pearson Education, Inc. All Rights Reserved.                           #
#                                                                        #
# DISCLAIMER: The authors and publisher of this book have used their     #
# best efforts in preparing the book. These efforts include the          #
# development, research, and testing of the theories and programs        #
# to determine their effectiveness. The authors and publisher make       #
# no warranty of any kind, expressed or implied, with regard to these    #
# programs or to the documentation contained in these books. The authors #
# and publisher shall not be liable in any event for incidental or       #
# consequential damages in connection with, or arising out of, the       #
# furnishing, performance, or use of these programs.                     #
##########################################################################

# Additional material (C) Copyright 2024 by Ronald Mak