At this level, your program will have some basic classes with specifications as below. You may need to define methods wherever appropriate to support these classes. At the end of the PASS level, your program should be able to run with a menu described in the Operations.

Customers:

$1.$ Class Customer i$.$ Attributes ID and name

ii$.$ Attribute value to store the total money the customer spent to date. A new customer will have the value of value to be $0$ before placing any order.

iii. Constructor takes the values of ID$,$ name, value as arguments

iv$.$ Appropriate getter methods for the attributes of this class

v$.$ A method get$\_$discount$($self$,$ price$)$ which returns $(0,$ price$)$ where the first return value represents the discount rate associated with the customer and the second value represents the input price. This method serves as a super method and will have a more complex implementation in the subclasses.

vi$.$ A method display$\_$info that prints the values of the Customer attributes and the discount rate associated with the customer.

All customers have a unique ID$,$ unique name $($a name will not include any digit$).$ You are required to write the class named Customer to support the following:

$2.$ Class Member

A member is a customer with a membership. When placing an order, a member will be offered a discount. All members are offered a discount of a flat rate $($i$.$e$.,$ the discount rate is the same for all orders $$ this is to distinguish from the discount of VIPMember below$).$ The class Member should have the following components:

i$.$ An attribute for discount rate, by default, it is $5\%.$

ii$.$ Constructor takes the appropriate parameters$/$arguments $($be careful$)$

iii. Appropriate getter methods for the attributes of this class

iv$.$ A method get$\_$discount$($self$,$ price$)$ that takes the price of the order and returns both the discount rate and the price after the discount. For example, this method returns $(0\mathrm{.}05,950)$ when the discount rate is $5\%$ and the order's price is $1000$$$.$

v$.$ A method display$\_$info$($self$)$ that prints the values of the Member attributes.

vi$.$ A method set$\_$rate to adjust the flat rate of discount. This affects all members.

$3.$ Class VIPMember

A VIP member is a customer with a VIP membership. All VIP members are offered a discount based on two rates: the first rate applies when the price of the order is smaller or equal to a threshold $($$$1000$ by default$),$ and the second rate applies when the order's price exceeds this threshold. For example, with the threshold being $1000$$$,$ then, when a VIP member named Sarah places an order that costs $800$$$,$ the discount rate for this order is the $1$st discount rate; when Sarah places an order that costs $1200$$$,$ the discount rate for this order is the $2$nd discount rate.

NOTE for all VIP members, the $2$nd discount rate is always $5\%$ more than the $1$st discount rate. The discount rates might be different among the VIP members. If not specified, the first and second discount rates are set as $10\%$ and $15\%,$ respectively. On the other hand, the threshold applies to all VIP members, i$.$e$.,$ all VIP members have the same threshold.

The class VIPMember should support the following components

i$.$ Attributes to support the two discount rates and the threshold limit

ii$.$ Necessary constructors

iii. Appropriate getter methods for the attributes of this class

iv$.$ A method get$\_$discount$($self$,$ price$)$ that takes the price of the order and returns both the discount rate and the price after the discount.

v$.$ A method display$\_$info that prints the values of the VIPMember attributes.

vi$.$ A method set$\_$rate to adjust the discount rates of each individual VIP member.

vii. A method set$\_$threshold to adjust the threshold limit$.$ This affects all VIP members.

Products

$4.$ Class Product

This class is to keep track of information on different products that the department store sells. This class supports the following information:

$$ ID: A unique identifier of the product $($e$.$g$.,$ P$1,$ P$2,$ P$3)$

$$ Name: The name of the products $($you can assume the product names are unique and they do not include any digit$)$

$$ Price: The price of the product

$$ Stock: the quantity of the product available in stock

You need to define appropriate attributes and methods to support the class Product. Note the stock quantity obviously will be changed. The product's price may also be changed by users.

Orders

$5.$ Class Order

This class is to handle customers' orders. This class supports the following information of an order:

$$ Customer: the one who place the order $($can be a normal customer, a customer with a normal membership, or a customer with a VIP membership$).$ Note you need to think$/$analyse if this should be an ID$,$ name, or something else.

$$ Product: the product of the order. Note you need to think$/$analyse if this should be an ID$,$ name, or something else.

$$ Quantity: the quantity of the product ordered by customers.

$$ You need to think if there are any extra attributes and methods you want to define in this class

Note that this class can update information