Online Shopping Kata
You work for a company called "Skin Deep" on their online beauty product shopping application. The company has a chain of physical Stores around the country, and also has this online application, so that customers can order products to collect in store, or for home delivery.
You are working on a part of the code, that handles updating the online shopping Cart, when a customer switches the Store they are shopping at. This code is in production and there are no known bugs in it.
You have just joined the team, and your first task is to add a new kind of delivery - by Drone. One of the other developers has started working on a unit test for the new feature, and helpfully left you a "TODO" to finish it off.
There is more information about the business rules for the existing features and new feature in the text below. See also the comments in the code.
Business Rules
A Session holds all the ModelObject classes which store their fields in the database. If you change the fields in these classes then the database schema will need updating, so don't do this unless you have to.
A shopping Cart contains a mix of Items of different types that can be bought from a Store. When you switch stores, if that item is available at the new store, then you keep it in your shopping cart. If it is not available there, then it is added to the 'unavailable' list. If the item is a StoreEvent and the new store has a similar event, you will need to switch to a similar item configured for the new store. A StoreEvent always has a location.
There are only three types of DeliveryInformation: PICKUP, HOME_DELIVERY and SHIPPING. No others are supported (yet). If a DeliveryInformation has type PICKUP or HOME_DELIVERY then the pickupLocation must be a Store.
When you are shopping online using the OnlineShopping class, you may choose to switch which store you are shopping at, and update it in the Session. This will impact the delivery options. If you have Pickup or Home Delivery then if possible you will keep that option, but with the new store. If the new store is too far away from your deliveryAddress you have to pickup from the original store. Otherwise, if the new store is close enough to your delivery address, the delivery information gets switched to home delivery.
If you switch to a null store, that means you will instead shop at the central warehouse and delivery will by by shipping.
Drone Delivery Rules
There is a new delivery method being trialled at certain stores - delivery by drone. You are working on adding support for this delivery type to the OnlineShopping class, in the 'switchStore' method.
If Drone delivery is selected then:
- the weight must be under 500g,
- the Pickup Location must be a Store,
- the delivery address must be specified,
- the location services must confirm that the pickup location is near to the delivery address.
When switching stores, if both current and new store support Drone delivery, then if possible, keep the delivery type unchanged. Just update the pickupLocation to the new store.
If you have chosen drone delivery from your current store but the new store does not support it, change the delivery type to HOME_DELIVERY, or PICKUP if that's not possible.
If the current store does not support Drone delivery, but the one you are switching to does, change to DRONE_DELIVERY if possible.
The central warehouse does not support Drone delivery.