• Backend: Node.js, Express, Sequelize, SQLite, JWT
• Frontend: React, Vite, Axios, React Router
• Auth: Email + Password, JWT

• JWT-based authentication
• Product management (create, edit, enable/disable)
• Promotion management
  • Percentage, fixed, and weighted promotions
  • Weighted promotions use slabs (min/max weight and discount per 500g)
• Order management
  • Per-item discount
  • Subtotal, total discount, grand total

cd backend
cp .env.example .env   # edit if needed
npm install
npm run dev

Then seed an admin user (once):

curl -X POST http://localhost:4000/api/auth/seed-admin \
  -H "Content-Type: application/json" \
  -d '{"name":"Admin","email":"[email protected]","password":"123456"}'

cd frontend
npm install
npm run dev

Open http://localhost:5173 and login:

• Email: [email protected]
• Password: 123456

docker-compose up --build

• Backend: http://localhost:4000
• Frontend: http://localhost:5173

• Only enabled promotions where start_date <= today <= end_date are applied.
• Promotions are global (apply to all products).
• If multiple promotions match an item, the largest discount is chosen.
• Weighted promotions:
  • Each promotion has multiple slabs: min_weight_gm, max_weight_gm, discount_per_500gm.
  • For a cart item:
    • total_weight_gm = product_weight_gm * quantity
    • pick slab where min <= total_weight_gm <= max
    • units = total_weight_gm / 500
    • discount = units * discount_per_500gm.

This is a reference implementation for the home task.
You can extend the UI/logic further or polish styling as desired.