shopping-cart

Problem Statement

As a user, I want to be able to add items to a shopping cart so that I can see the total price. The total price takes into account the quantity of each item as well as offers and discounts. Items are limited and are stored in an inventory. Item names don’t contain spaces. For all amounts, round to 2 decimal places using common-rounding . Inventory The inventory is a list of available items, the unit price, and their quantities. The initial values are loaded from a file. The file needs to be specified as an input when running the program. Each row should have the following format:

<product_name>,<amount>,<quantity>

Ex.

inventory.csv
soap,10.00,100
bread,2.50,10

Note: You are not expected to update values in the file during runtime. Offers Your shopping cart should support the following offers:

1. Buy 2 Get One Free ( buy_2_get_1_free ): When applied to an item, every third item added is free;
2. Buy 1 Get 50% Off on next ( buy_1_get_half_off ): Every second item is charged at half the price. Running the program The application should allow input in two different ways: ● if only the inventory argument is provided, the application starts an interactive prompt, where the actions can be typed in; ● if the commands file path is provided as a second argument, such a file is parsed and the commands in it executed one by one. In both cases, the commands are separated by a new line. If two offers are applied at the same product, only the more recent one stands.

Interactive mode

$ ./supermarket inventory.csv

$ checkout

empty cart

$ add soap 5

added soap 5

$ add bread 1

added bread 1

$ bill

subtotal:52.50, discount:0.00, total:52.50

$ offer buy_2_get_1_free soap

offer added

$ bill

subtotal:52.50, discount:10.00, total:42.50

$ add soap 1

added soap 1

$ bill

subtotal:62.50, discount:20.00, total:42.50

$ offer buy_1_get_half_off bread

offer added

$ add bread 1

added bread 1

$ bill

subtotal:65.00, discount:21.25, total:43.75

$ checkout

done

File mode

$ cat commands.txt

checkout

add soap 5

add bread 1

bill

offer buy_2_get_1_free soap

bill

add soap 1

bill

offer buy_1_get_half_off bread

add bread 1

bill

checkout

$ ./supermarket inventory.csv commands.txt