# Order.py

# Class Method page 57

# Filename: Order.py
# Class name: Order
# Constructor name: Order()  # Tuples() construct immutable data
# Best practice instance name: order
# Garbage Collection Finalizer name: ~Order

# 'Factory Methods' initialize <instance of the class> on a class, using VERY VERY specific parameters that commonly ARE NOT a part of the constructor  'extends attrs on the class'

class Order:
    # Classes Attributes
    tax_rate = 0 # class-wide attr for tax_rate, default value is .05
    vat_rate = 1.10 # vat tax

    # Constructors Attributes  Order()
    def __init__(self, orderid, amount):
        self.orderid = orderid
        self.amount = amount

    # define a method of setting the tax rate
    @classmethod
    def set_taxRate(cls, new_tax_rate):
        cls.tax_rate = new_tax_rate # set the new value if passed ACROSS the WHOLE Class, INCLUDING all instance objects of the class __init__() or static,instance or even other class methods

    # instance method to calc total
    def calculate_total(self):
        return self.amount + (self.amount * Order.tax_rate)

# Output
order1 = Order("1001", 1000)
# Object 1 we are going to use the default tax rate of 0
print(f'Amount: ${order1.amount} Total: ${order1.calculate_total():.2f}') # Amount: 1000  Total: 1000
        
# Object 2 Set and New tax rate then calculation
Order.set_taxRate(.05)

order2 = Order("1002", 1000)
print(f'Amount: ${order2.amount} Total: ${order2.calculate_total():.2f}')