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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Self-Service Ordering</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        .category-btn.active {
            background-color: #3b82f6;
            color: white;
        }
        .item-btn:hover {
            transform: scale(1.02);
        }
        .cart-item:hover {
            background-color: #f3f4f6;
        }
        .num-pad-btn:active {
            transform: scale(0.95);
        }
        @media (max-width: 640px) {
            .category-scroll {
                overflow-x: auto;
                white-space: nowrap;
                padding-bottom: 8px;
            }
            .category-scroll::-webkit-scrollbar {
                height: 4px;
            }
        }
    </style>
</head>
<body class="bg-gray-100 font-sans">
    <div class="flex flex-col h-screen max-w-md mx-auto bg-white shadow-lg">
        <!-- Header - Simplified for customers -->
        <header class="bg-blue-600 text-white p-4 shadow-md">
            <div class="flex justify-between items-center">
                <h1 class="text-xl font-bold">Self-Service Ordering</h1>
                <div class="flex items-center space-x-2">
                    <span class="text-sm">Table #<span id="table-number">5</span></span>
                </div>
            </div>
        </header>

        <!-- Main Content - Single column for mobile -->
        <div class="flex-1 overflow-hidden flex flex-col">
            <!-- Category Navigation -->
            <div class="p-2 bg-gray-200 category-scroll">
                <div class="inline-flex space-x-2">
                    <button class="category-btn active px-3 py-2 rounded-lg bg-blue-500 text-white text-sm" data-category="all">
                        All
                    </button>
                    <button class="category-btn px-3 py-2 rounded-lg bg-white hover:bg-gray-300 text-sm" data-category="food">
                        Food
                    </button>
                    <button class="category-btn px-3 py-2 rounded-lg bg-white hover:bg-gray-300 text-sm" data-category="drinks">
                        Drinks
                    </button>
                    <button class="category-btn px-3 py-2 rounded-lg bg-white hover:bg-gray-300 text-sm" data-category="snacks">
                        Snacks
                    </button>
                    <button class="category-btn px-3 py-2 rounded-lg bg-white hover:bg-gray-300 text-sm" data-category="alcohol">
                        Beverages
                    </button>
                </div>
            </div>

            <!-- Product Grid - Adjusted for mobile -->
            <div class="flex-1 p-2 overflow-y-auto grid grid-cols-2 gap-2" id="product-grid">
                <!-- Product buttons will be generated here -->
            </div>

            <!-- Order Summary Bar - Sticky at bottom -->
            <div class="sticky bottom-0 bg-white border-t border-gray-300">
                <div class="flex justify-between items-center p-2">
                    <div class="text-sm">
                        <span id="cart-count">0</span> item(s) | ₱<span id="cart-total">0.00</span>
                    </div>
                    <button class="bg-green-500 hover:bg-green-600 text-white px-4 py-2 rounded-lg text-sm" id="view-cart">
                        <i class="fas fa-shopping-cart mr-1"></i> View Cart
                    </button>
                </div>
            </div>
        </div>

        <!-- Cart Modal -->
        <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center hidden" id="cart-modal">
            <div class="bg-white rounded-t-lg w-full max-w-md absolute bottom-0 max-h-[80vh] flex flex-col">
                <div class="p-4 border-b border-gray-300 flex justify-between items-center sticky top-0 bg-white">
                    <h2 class="text-lg font-bold">Your Order</h2>
                    <button class="text-gray-500" id="close-cart">
                        <i class="fas fa-times"></i>
                    </button>
                </div>
                <div class="flex-1 overflow-y-auto p-4" id="cart-items">
                    <!-- Cart items will be displayed here -->
                    <div class="text-center text-gray-500 py-10" id="empty-cart-message">
                        <i class="fas fa-shopping-cart text-4xl mb-2"></i>
                        <p>Your cart is empty</p>
                        <p class="text-sm">Select items to add to your order</p>
                    </div>
                </div>
                <div class="p-4 bg-white border-t border-gray-300">
                    <div class="flex justify-between mb-1 text-sm">
                        <span>Subtotal:</span>
                        <span id="subtotal">₱0.00</span>
                    </div>
                    <div class="flex justify-between mb-1 text-sm">
                        <span>Tax (10%):</span>
                        <span id="tax">₱0.00</span>
                    </div>
                    <div class="flex justify-between font-bold mt-2">
                        <span>TOTAL:</span>
                        <span id="total">₱0.00</span>
                    </div>
                    <div class="grid grid-cols-2 gap-2 mt-4">
                        <button class="bg-gray-200 hover:bg-gray-300 py-2 rounded-lg text-sm" id="keep-shopping">
                            Keep Shopping
                        </button>
                        <button class="bg-blue-500 hover:bg-blue-600 text-white py-2 rounded-lg text-sm" id="proceed-payment">
                            Checkout
                        </button>
                    </div>
                </div>
            </div>
        </div>

        <!-- Table Selection Modal -->
        <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center hidden" id="table-modal">
            <div class="bg-white rounded-lg p-6 w-5/6 max-w-sm">
                <h2 class="text-lg font-bold mb-4">Select Your Table</h2>
                <div class="grid grid-cols-4 gap-2">
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="1">1</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="2">2</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="3">3</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="4">4</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="5">5</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="6">6</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="7">7</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="8">8</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="9">9</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="10">10</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="11">11</button>
                    <button class="table-btn bg-gray-200 hover:bg-gray-300 py-3 rounded" data-table="12">12</button>
                </div>
                <div class="mt-4 flex justify-center">
                    <button class="bg-blue-500 hover:bg-blue-600 text-white px-4 py-2 rounded-lg text-sm" id="confirm-table">
                        Confirm
                    </button>
                </div>
            </div>
        </div>

        <!-- Payment Modal -->
        <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center hidden" id="payment-modal">
            <div class="bg-white rounded-lg p-6 w-5/6 max-w-sm">
                <h2 class="text-lg font-bold mb-4">Payment</h2>
                <div class="mb-4">
                    <div class="flex justify-between mb-1">
                        <span>Total:</span>
                        <span id="payment-total">₱0.00</span>
                    </div>
                    <div class="mb-3">
                        <label class="block text-gray-700 mb-1 text-sm">Payment Method</label>
                        <select class="w-full p-2 border rounded text-sm" id="payment-method">
                            <option value="cash">Cash</option>
                            <option value="card">Credit/Debit Card</option>
                            <option value="mobile">Mobile Payment</option>
                        </select>
                    </div>
                    <div class="mb-3" id="cash-payment">
                        <label class="block text-gray-700 mb-1 text-sm">Amount Received</label>
                        <input type="number" class="w-full p-2 border rounded text-sm" id="amount-received">
                        <div class="grid grid-cols-3 gap-2 mt-2" id="payment-keypad">
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">1</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">2</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">3</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">4</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">5</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">6</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">7</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">8</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">9</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">.</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">0</button>
                            <button class="num-pad-btn bg-gray-200 hover:bg-gray-300 py-2 rounded">
                                <i class="fas fa-backspace"></i>
                            </button>
                        </div>
                    </div>
                    <div class="hidden" id="change-display">
                        <div class="flex justify-between">
                            <span>Change:</span>
                            <span id="change-amount">₱0.00</span>
                        </div>
                    </div>
                </div>
                <div class="flex space-x-2">
                    <button class="flex-1 bg-gray-500 hover:bg-gray-600 text-white py-2 rounded-lg text-sm" id="cancel-payment">
                        Cancel
                    </button>
                    <button class="flex-1 bg-green-500 hover:bg-green-600 text-white py-2 rounded-lg text-sm" id="complete-payment">
                        Pay Now
                    </button>
                </div>
            </div>
        </div>

        <!-- Order Confirmation Modal -->
        <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center hidden" id="confirmation-modal">
            <div class="bg-white rounded-lg p-6 w-5/6 max-w-sm text-center">
                <div class="text-green-500 text-5xl mb-4">
                    <i class="fas fa-check-circle"></i>
                </div>
                <h2 class="text-xl font-bold mb-2">Order Placed Successfully!</h2>
                <p class="text-gray-600 mb-4">Your order #<span id="order-number">123</span> has been received.</p>
                <p class="text-sm text-gray-500 mb-4">Estimated preparation time: 15-20 minutes</p>
                <button class="bg-blue-500 hover:bg-blue-600 text-white px-4 py-2 rounded-lg w-full" id="new-order">
                    Start New Order
                </button>
            </div>
        </div>
    </div>

    <script>
        // Sample data
        const products = [
            { id: 1, name: "Cheeseburger", price: 5.99, category: "food" },
            { id: 2, name: "Pepperoni Pizza", price: 8.99, category: "food" },
            { id: 3, name: "French Fries", price: 2.99, category: "food" },
            { id: 4, name: "Soda", price: 1.50, category: "drinks" },
            { id: 5, name: "Bottled Water", price: 1.00, category: "drinks" },
            { id: 6, name: "Orange Juice", price: 2.50, category: "drinks" },
            { id: 7, name: "Potato Chips", price: 1.25, category: "snacks" },
            { id: 8, name: "Chocolate Bar", price: 1.00, category: "snacks" },
            { id: 9, name: "Craft Beer", price: 3.50, category: "alcohol" },
            { id: 10, name: "House Wine", price: 5.00, category: "alcohol" },
            { id: 11, name: "Garden Salad", price: 4.50, category: "food" },
            { id: 12, name: "Coffee", price: 2.00, category: "drinks" }
        ];

        // Current cart state
        let cart = [];
        let currentTable = 5;
        let orderNumber = Math.floor(Math.random() * 9000) + 1000;

        // DOM elements
        const productGrid = document.getElementById('product-grid');
        const cartItemsContainer = document.getElementById('cart-items');
        const emptyCartMessage = document.getElementById('empty-cart-message');
        const subtotalElement = document.getElementById('subtotal');
        const taxElement = document.getElementById('tax');
        const totalElement = document.getElementById('total');
        const cartTotalElement = document.getElementById('cart-total');
        const cartCountElement = document.getElementById('cart-count');
        const categoryButtons = document.querySelectorAll('.category-btn');
        const tableNumberElement = document.getElementById('table-number');

        // Initialize the app
        function init() {
            renderProducts('all');
            updateTableNumber();
            
            // Show table selection modal on first load
            document.getElementById('table-modal').classList.remove('hidden');
        }

        // Render products based on category
        function renderProducts(category) {
            productGrid.innerHTML = '';
            
            const filteredProducts = category === 'all' 
                ? products 
                : products.filter(product => product.category === category);
            
            filteredProducts.forEach(product => {
                const productBtn = document.createElement('div');
                productBtn.className = 'item-btn bg-white p-3 rounded-lg shadow-sm border border-gray-200 flex flex-col items-center';
                productBtn.dataset.id = product.id;
                
                productBtn.innerHTML = `
                    <div class="w-12 h-12 bg-blue-100 rounded-full flex items-center justify-center mb-2 overflow-hidden">
                        ${product.image ? `<img src="${product.image}" class="w-full h-full object-cover">` : `
                        <i class="fas ${getProductIcon(product.category)} text-blue-500"></i>`}
                    </div>
                    <span class="font-semibold text-sm text-center">${product.name}</span>
                    <span class="text-blue-600 text-sm">₱${product.price.toFixed(2)}</span>
                `;
                
                productBtn.addEventListener('click', () => addToCart(product.id));
                productGrid.appendChild(productBtn);
            });
        }

        // Helper function to get appropriate icon for product category
        function getProductIcon(category) {
            switch(category) {
                case 'food': return 'fa-utensils';
                case 'drinks': return 'fa-glass-whiskey';
                case 'snacks': return 'fa-cookie';
                case 'alcohol': return 'fa-wine-glass-alt';
                default: return 'fa-shopping-bag';
            }
        }

        // Add item to cart
        function addToCart(productId) {
            const product = products.find(p => p.id === productId);
            const existingItem = cart.find(item => item.id === productId);
            
            if (existingItem) {
                existingItem.quantity++;
            } else {
                cart.push({
                    id: product.id,
                    name: product.name,
                    price: product.price,
                    quantity: 1
                });
            }
            
            updateCartDisplay();
            showAddedToCartFeedback(product.name);
        }

        // Show brief feedback when item is added to cart
        function showAddedToCartFeedback(productName) {
            const feedback = document.createElement('div');
            feedback.className = 'fixed bottom-20 left-1/2 transform -translate-x-1/2 bg-green-500 text-white px-4 py-2 rounded-lg shadow-lg z-50 animate-fade';
            feedback.innerHTML = `Added ${productName} to cart`;
            document.body.appendChild(feedback);
            
            setTimeout(() => {
                feedback.classList.add('opacity-0', 'transition-opacity', 'duration-300');
                setTimeout(() => feedback.remove(), 300);
            }, 1500);
        }

        // Update cart display in the bottom bar
        function updateCartMiniDisplay() {
            const itemCount = cart.reduce((sum, item) => sum + item.quantity, 0);
            const total = cart.reduce((sum, item) => sum + (item.price * item.quantity), 0);
            
            cartCountElement.textContent = itemCount;
            cartTotalElement.textContent = total.toFixed(2);
        }

        // Render cart items in the cart modal
        function renderCart() {
            if (cart.length === 0) {
                emptyCartMessage.classList.remove('hidden');
                cartItemsContainer.innerHTML = '';
                return;
            }
            
            emptyCartMessage.classList.add('hidden');
            cartItemsContainer.innerHTML = '';
            
            cart.forEach(item => {
                const cartItem = document.createElement('div');
                cartItem.className = 'cart-item flex justify-between items-center p-3 mb-2 bg-white rounded-lg shadow-sm';
                cartItem.innerHTML = `
                    <div class="flex-1">
                        <div class="font-semibold text-sm">${item.name}</div>
                        <div class="text-xs text-gray-500">₱${item.price.toFixed(2)} each</div>
                    </div>
                    <div class="flex items-center">
                        <button class="qty-btn minus w-6 h-6 rounded-full bg-gray-200 flex items-center justify-center text-xs" data-id="${item.id}">
                            <i class="fas fa-minus"></i>
                        </button>
                        <span class="mx-2 w-6 text-center text-sm">${item.quantity}</span>
                        <button class="qty-btn plus w-6 h-6 rounded-full bg-gray-200 flex items-center justify-center text-xs" data-id="${item.id}">
                            <i class="fas fa-plus"></i>
                        </button>
                        <div class="ml-3 w-16 text-right text-sm font-semibold">₱${(item.price * item.quantity).toFixed(2)}</div>
                        <button class="delete-btn ml-2 w-6 h-6 rounded-full bg-red-100 text-red-600 flex items-center justify-center text-xs" data-id="${item.id}">
                            <i class="fas fa-times"></i>
                        </button>
                    </div>
                `;
                cartItemsContainer.appendChild(cartItem);
            });
            
            updateCartTotals();
        }

        // Update cart totals
        function updateCartTotals() {
            const subtotal = cart.reduce((sum, item) => sum + (item.price * item.quantity), 0);
            const tax = subtotal * 0.10;
            const total = subtotal + tax;
            
            subtotalElement.textContent = `₱${subtotal.toFixed(2)}`;
            taxElement.textContent = `₱${tax.toFixed(2)}`;
            totalElement.textContent = `₱${total.toFixed(2)}`;
        }

        // Update entire cart display (both mini and modal)
        function updateCartDisplay() {
            updateCartMiniDisplay();
            renderCart();
            updateCartTotals();
        }

        // Update table number display
        function updateTableNumber() {
            tableNumberElement.textContent = currentTable;
        }

        // Event listeners
        categoryButtons.forEach(btn => {
            btn.addEventListener('click', function() {
                categoryButtons.forEach(b => b.classList.remove('active', 'bg-blue-500', 'text-white'));
                this.classList.add('active', 'bg-blue-500', 'text-white');
                renderProducts(this.getAttribute('data-category'));
            });
        });

        // View cart button
        document.getElementById('view-cart').addEventListener('click', function() {
            document.getElementById('cart-modal').classList.remove('hidden');
        });

        // Close cart modal
        document.getElementById('close-cart').addEventListener('click', function() {
            document.getElementById('cart-modal').classList.add('hidden');
        });

        // Keep shopping button
        document.getElementById('keep-shopping').addEventListener('click', function() {
            document.getElementById('cart-modal').classList.add('hidden');
        });

        // Proceed to payment button
        document.getElementById('proceed-payment').addEventListener('click', function() {
            if (cart.length === 0) return;
            
            document.getElementById('payment-total').textContent = totalElement.textContent;
            document.getElementById('cart-modal').classList.add('hidden');
            document.getElementById('payment-modal').classList.remove('hidden');
        });

        // Cancel payment button
        document.getElementById('cancel-payment').addEventListener('click', function() {
            document.getElementById('payment-modal').classList.add('hidden');
        });

        // Complete payment button
        document.getElementById('complete-payment').addEventListener('click', function() {
            const paymentMethod = document.getElementById('payment-method').value;
            const amountReceived = parseFloat(document.getElementById('amount-received').value) || 0;
            const total = parseFloat(totalElement.textContent.substring(1));
            
            // Validate cash payment
            if (paymentMethod === 'cash' && amountReceived < total) {
                alert('Amount received is less than total amount');
                return;
            }
            
            // Process the payment
            processPayment();
        });

        // Process the payment and show confirmation
        function processPayment() {
            // In a real app, this would send the order to the kitchen/bar system
            document.getElementById('payment-modal').classList.add('hidden');
            document.getElementById('order-number').textContent = orderNumber++;
            document.getElementById('confirmation-modal').classList.remove('hidden');
            
            // Reset for new order
            cart = [];
            updateCartDisplay();
        }

        // Start new order button
        document.getElementById('new-order').addEventListener('click', function() {
            document.getElementById('confirmation-modal').classList.add('hidden');
            document.getElementById('table-modal').classList.remove('hidden');
        });

        // Table selection
        document.querySelectorAll('.table-btn').forEach(btn => {
            btn.addEventListener('click', function() {
                // Highlight selected table
                document.querySelectorAll('.table-btn').forEach(b => 
                    b.classList.remove('bg-blue-500', 'text-white'));
                this.classList.add('bg-blue-500', 'text-white');
                currentTable = parseInt(this.dataset.table);
            });
        });

        // Confirm table selection
        document.getElementById('confirm-table').addEventListener('click', function() {
            document.getElementById('table-modal').classList.add('hidden');
            updateTableNumber();
        });

        // Handle quantity changes in cart
        document.addEventListener('click', function(e) {
            if (e.target.closest('.qty-btn')) {
                const btn = e.target.closest('.qty-btn');
                const itemId = parseInt(btn.getAttribute('data-id'));
                const item = cart.find(i => i.id === itemId);
                
                if (btn.classList.contains('minus')) {
                    if (item.quantity > 1) {
                        item.quantity--;
                    } else {
                        cart = cart.filter(i => i.id !== itemId);
                    }
                } else if (btn.classList.contains('plus')) {
                    item.quantity++;
                }
                
                updateCartDisplay();
            }
            
            if (e.target.closest('.delete-btn')) {
                const itemId = parseInt(e.target.closest('.delete-btn').getAttribute('data-id'));
                cart = cart.filter(i => i.id !== itemId);
                updateCartDisplay();
            }
        });

        // Payment keypad functionality
        document.querySelectorAll('#payment-keypad .num-pad-btn').forEach(btn => {
            btn.addEventListener('click', function() {
                const input = document.getElementById('amount-received');
                let currentValue = input.value || '';
                
                if (this.textContent.trim() === '<i class="fas fa-backspace"></i>') {
                    input.value = currentValue.slice(0, -1);
                } else if (this.textContent.trim() === '.' && currentValue.includes('.')) {
                    return;
                } else {
                    input.value = currentValue + this.textContent.trim();
                }
                
                // Calculate change if cash payment
                const amountReceived = parseFloat(input.value) || 0;
                const total = parseFloat(totalElement.textContent.substring(1));
                
                if (amountReceived >= total) {
                    const change = amountReceived - total;
                    document.getElementById('change-amount').textContent = `₱${change.toFixed(2)}`;
                    document.getElementById('change-display').classList.remove('hidden');
                } else {
                    document.getElementById('change-display').classList.add('hidden');
                }
            });
        });

        // Payment method change handler
        document.getElementById('payment-method').addEventListener('change', function() {
            if (this.value === 'cash') {
                document.getElementById('cash-payment').classList.remove('hidden');
            } else {
                document.getElementById('cash-payment').classList.add('hidden');
                document.getElementById('change-display').classList.add('hidden');
            }
        });

        // Initialize the app when the page loads
        window.addEventListener('DOMContentLoaded', init);
    </script>
</body>
</html>