Overview

Implement a complete shopping cart system for the OctoCAT Supply Chain Management application, including cart state management, cart page UI, and navigation integration.

Features to Implement

1. State Management

• Create a Cart Context similar to existing AuthContext and ThemeContext
• Implement cart state structure (product details, quantity, unit price, total price)
• Add localStorage persistence for cart data across browser sessions

2. Cart Context Provider

• Add/Remove items functionality
• Update quantity functionality
• Automatic calculation of subtotal, discounts, shipping, and grand total
• Maintain cart item count for navbar badge
• Clear cart functionality

3. Navigation Enhancement

• Add shopping cart icon to Navigation.tsx component
• Display item count badge on cart icon
• Ensure cart icon styling works with dark/light theme

4. Cart Page Component

• Create cart table with columns:
  • S. No.
  • Product Image
  • Product Name
  • Unit Price
  • Quantity (with increment/decrement controls)
  • Total
  • Remove button
• Implement Order Summary section with:
  • Subtotal
  • Discount calculation
  • Shipping costs
  • Grand total
• Add action buttons: Update Cart, Apply Coupon, Proceed to Checkout

5. Product Integration

• Add 'Add to Cart' button to Products.tsx component
• Enhance product modals with cart actions
• Implement quantity selector for adding products

6. Routing

• Add /cart route to React Router configuration
• Update navigation to include cart page link

7. UI/UX Enhancements

• Add loading states for cart operations
• Implement success notifications (toast messages)
• Create empty cart state with call-to-action
• Ensure responsive design for mobile devices

8. Validation & Error Handling

• Prevent negative quantities and enforce maximum limits
• Add product availability checks
• Validate coupon codes and quantities

9. Styling Consistency

• Integrate with existing dark/light theme system
• Use consistent Tailwind classes from existing components
• Extract reusable components (quantity selectors, price displays)

Acceptance Criteria

• Users can add products to cart from the product catalog
• Cart icon in navigation shows current item count
• Cart page displays all added items with proper formatting
• Users can modify quantities and remove items from cart
• Order summary calculates totals correctly including discounts
• Cart state persists across browser sessions
• All functionality works in both dark and light themes
• Responsive design works on mobile and desktop

Technical Requirements

• Maintain TypeScript patterns and component structure
• Follow existing code patterns and architecture
• Ensure compatibility with current build system
• Add appropriate error handling and validation

Related Files

• frontend/src/components/Navigation.tsx
• frontend/src/components/entity/product/Products.tsx
• frontend/src/context/ (new CartContext)
• frontend/src/App.tsx (routing)

Priority

Medium - This feature will enhance the user experience and demonstrate complete e-commerce functionality for the demo application.