Opptra Discount Engine — Base Implementation

This is the base implementation for the Opptra FDE Intern assignment. Fork this repo, complete the tasks in the assignment brief, and submit your GitHub link + Loom.

Running locally

npm install
npm run dev

Open http://localhost:5173

Deploying

npm run build

Deploy the dist/ folder to Vercel, Netlify, or any static host. The live deployment URL must be in your README before submission.

How to use

1. Upload sample-data/rules.csv as the discount rules input
2. Upload sample-data/cart.csv as the cart input
3. Click Calculate Discounts

Project structure

src/
  engine/
    discountEngine.js   ← pure discount logic (no UI)
    csvParser.js        ← CSV → typed objects
  components/
    CsvUploader.jsx     ← file upload area
    DataTable.jsx       ← reusable table
    ErrorBanner.jsx     ← parse error display
  App.jsx               ← main UI + state
  main.jsx              ← entry point

sample-data/
  rules.csv             ← sample discount rules
  cart.csv              ← sample cart items

CSV formats

rules.csv

Column	Type	Example
rule_id	string	RULE-01
scope	brand | platform	platform
applies_to	string	Amazon India
type	percentage | flat	percentage
value	number	15
stackable	true | false	false

cart.csv

Column	Type	Example
item_id	string	ITEM-01
product	string	Cushion Cover
brand	string	Natura Casa
platform	string	Amazon India
base_price	number	1299

Discount logic

• When multiple non-stackable rules match an item, the one giving the largest saving in rupees is applied.
• Rules marked stackable: true apply on top of the winning non-stackable rule.
• If no rules match, the base price is returned with a "No offers available" note.

Expected results for the sample data

Item	Base Price	Final Price	Reasoning
ITEM-01	Rs.1,299	Rs.1,104	Platform offer: 15% off (beats Rs.150)
ITEM-02	Rs.849	Rs.629	Brand offer: Rs.150 off + Platform 10%
ITEM-03	Rs.599	Rs.509	Platform offer: 15% off
ITEM-04	Rs.2,499	Rs.2,499	No offers available
ITEM-05	Rs.449	Rs.382	Platform offer: 15% off
ITEM-06	Rs.899	Rs.809	Platform offer: 10% off