# Shopping Cart Implementation - Granny Restaurant

## Overview
The shopping cart functionality has been successfully implemented for the Granny Restaurant website. Users can now add dishes from the menu board to their cart, and the cart counter in the navigation bar updates dynamically.

## What Was Implemented

### 1. **Cart Manager System** 
📁 File: [assets/js/cart-manager.js](assets/js/cart-manager.js)

A robust JavaScript class that handles all cart operations:
- **Add to Cart**: Add dishes with automatic quantity increment if item already exists
- **Remove from Cart**: Delete items by index
- **Update Quantity**: Modify item quantities and auto-remove items with quantity ≤ 0
- **Cart Persistence**: Uses localStorage to persist cart data across page refreshes and browser sessions
- **Cart Counter Updates**: Automatically updates the cart icon counter in the navigation bar
- **Add Notifications**: Shows success notification when items are added

### 2. **Cart Styling**
📁 File: [assets/css/cart.css](assets/css/cart.css)

Beautiful and responsive cart UI with:
- Cart notification animation (success feedback)
- Cart table with product details
- Quantity control buttons (+/- and direct input)
- Cart summary section with subtotal, tax, and total
- Empty cart state with friendly message
- Checkout and continue shopping buttons

### 3. **Menu Board Updates**
📁 File: [menu-board.html](menu-board.html)

Enhanced with cart functionality:
- Added "Add to Cart" button click handlers
- Captures dish name, price, and image information
- Sends data to cart manager for storage
- Cart icon links to cart.html
- Includes cart-manager.js and cart.css

### 4. **Shopping Cart Page**
📁 File: [cart.html](cart.html)

Complete cart management interface featuring:
- Dynamic cart item display
- Product images, names, and prices
- Quantity adjustment controls
- Item removal functionality
- Cart summary with calculations
- Empty cart message with link to menu
- Continue shopping and checkout buttons

## How It Works

### Adding Items to Cart
1. User clicks "Add to Cart" button on menu-board.html
2. JavaScript captures dish details:
   - Name (from `.menu-card-title`)
   - Price (from `.menu-card-price`)
   - Image (from `.menu-card-img`)
3. CartManager stores item in localStorage
4. Success notification appears
5. Cart counter in navbar updates

### Viewing Cart
1. User clicks cart icon in navigation bar
2. Navigates to cart.html
3. Page loads cart items from localStorage using CartManager
4. Displays:
   - All cart items with details
   - Quantity adjustment controls
   - Item totals
   - Cart summary (subtotal + tax)
   - Action buttons (Continue/Checkout)

### Persistent Storage
- All cart data stored in browser's localStorage
- Cart persists across:
  - Page refreshes
  - Browser restarts
  - Multiple tabs/windows (with sync capability)

## File Structure

```
assets/
├── js/
│   └── cart-manager.js          ✅ NEW: Cart management system
├── css/
│   └── cart.css                 ✅ NEW: Cart styling
menu-board.html                   ✅ UPDATED: Added cart functionality
cart.html                         ✅ UPDATED: Cart display page
index.html                        ✅ UPDATED: Cart icon link
header-1.html                     ✅ UPDATED: Cart icon link
```

## Technical Details

### Cart Data Structure
```javascript
{
  name: "Grilled American Fillet",
  price: 24.95,
  quantity: 1,
  image: "assets/images/menu/menu-board/1.jpg"
}
```

### Key Methods
- `cartManager.addToCart(dish)` - Add/increment item
- `cartManager.removeFromCart(index)` - Delete item
- `cartManager.updateQuantity(index, qty)` - Change quantity
- `cartManager.getCart()` - Retrieve all items
- `cartManager.getCartCount()` - Get total item count
- `cartManager.getCartTotal()` - Calculate cart value

## Browser Compatibility
- ✅ Chrome/Chromium
- ✅ Firefox
- ✅ Safari
- ✅ Edge
- ✅ Mobile browsers

## Features

### User Experience
✅ Real-time cart counter updates
✅ Smooth add-to-cart notifications  
✅ Intuitive quantity controls
✅ Empty cart state handling
✅ Responsive design for all devices
✅ Persistent storage across sessions

### Admin/Developer Features
✅ Clean, maintainable code
✅ Modular architecture
✅ Easy to extend with checkout functionality
✅ localStorage-based (no database needed)
✅ Clear separation of concerns

## Next Steps (Optional Enhancements)

1. **Checkout Integration**
   - Connect to payment gateway
   - Order confirmation page

2. **User Accounts**
   - Save carts to user profiles
   - Order history

3. **Coupon/Discount System**
   - Promo code support
   - Percentage/fixed discounts

4. **Advanced Features**
   - Wishlist functionality
   - Quick reorder from past carts
   - Share cart with others

## Testing Checklist

- ✅ Add item to cart
- ✅ Cart counter updates in navbar
- ✅ Success notification appears
- ✅ Cart persists on page refresh
- ✅ View cart.html displays items correctly
- ✅ Modify quantities
- ✅ Remove items
- ✅ Total calculations correct
- ✅ Empty cart message displays properly
- ✅ Continue shopping navigation works

## Support

All files are ready for deployment. The implementation uses:
- Vanilla JavaScript (ES6 classes)
- localStorage API (no external dependencies)
- jQuery (already in project for DOM manipulation)
- Responsive CSS (Bootstrap compatible)

---

**Implementation Date**: January 22, 2026
**Status**: ✅ Complete and Functional
