// Smooth scrolling for anchor links
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function (e) {
        e.preventDefault();
        document.querySelector(this.getAttribute('href')).scrollIntoView({
            behavior: 'smooth'
        });
    });
});

function addToCart(name, price, quantityId) {
    const quantityInput = document.getElementById(quantityId);
    const quantity = parseInt(quantityInput.value, 10);

    if (quantity < 1) {
        alert("Quantity must be at least 1.");
        return;
    }

    let cart = JSON.parse(localStorage.getItem('cart')) || {};
    if (cart[name]) {
        cart[name].quantity += quantity;
    } else {
        cart[name] = {
            price: price,
            quantity: quantity
        };
    }
    localStorage.setItem('cart', JSON.stringify(cart));
    updateCartCount();
    updateButtonStates();
}

function updateCartCount() {
    let cart = JSON.parse(localStorage.getItem('cart')) || {};
    let count = Object.values(cart).reduce((sum, item) => sum + item.quantity, 0);
    const cartCountElement = document.getElementById('cart-count');
    if (cartCountElement) {
        cartCountElement.innerText = count;
    }
}

function updateButtonStates() {
    let cart = JSON.parse(localStorage.getItem('cart')) || {};
    const buttons = document.querySelectorAll('.buy-button');
    buttons.forEach(button => {
        const productName = button.getAttribute('data-product-name');
        if (cart[productName]) {
            button.textContent = 'In the cart';
            button.disabled = true;
        } else {
            button.textContent = 'Buy';
            button.disabled = false;
        }
    });
}

function renderCart() {
    const cartContainer = document.getElementById('cart-container');
    if (!cartContainer) return;

    let cart = JSON.parse(localStorage.getItem('cart')) || {};

    if (Object.keys(cart).length === 0) {
        cartContainer.innerHTML = `
            <div class="card">
                <div class="card-body text-center">
                    <p>Your cart is currently empty.</p>
                    <a href="index.php#menu" class="btn btn-primary">Continue Shopping</a>
                </div>
            </div>
        `;
        return;
    }

    let table = `
        <div class="card">
            <div class="card-body">
                <table class="table">
                    <thead>
                        <tr>
                            <th>Item</th>
                            <th>Price</th>
                            <th>Quantity</th>
                            <th>Total</th>
                            <th></th>
                        </tr>
                    </thead>
                    <tbody>
    `;

    let grandTotal = 0;
    for (const name in cart) {
        const item = cart[name];
        const total = item.price * item.quantity;
        grandTotal += total;
        table += `
            <tr>
                <td>${name}</td>
                <td>${item.price.toFixed(2)}</td>
                <td>
                    <input type="number" class="form-control" value="${item.quantity}" min="1" style="width: 70px;" onchange="updateQuantity('${name}', this.value)">
                </td>
                <td id="total-${name}">${total.toFixed(2)}</td>
                <td><button class="btn btn-danger btn-sm" onclick="removeFromCart('${name}')">Remove</button></td>
            </tr>
        `;
    }

    table += `
                    </tbody>
                </table>
                <hr>
                <div class="text-end">
                    <h4 id="grand-total">Grand Total: ${grandTotal.toFixed(2)}</h4>
                    <a href="checkout.php" class="btn btn-primary">Proceed to Checkout</a>
                </div>
            </div>
        </div>
    `;
    cartContainer.innerHTML = table;
}

function updateQuantity(name, newQuantity) {
    let cart = JSON.parse(localStorage.getItem('cart')) || {};
    const quantity = parseInt(newQuantity, 10);

    if (quantity > 0) {
        cart[name].quantity = quantity;
    } else {
        delete cart[name];
    }
    localStorage.setItem('cart', JSON.stringify(cart));
    renderCart();
    updateCartCount();
    updateButtonStates();
}

function removeFromCart(name) {
    let cart = JSON.parse(localStorage.getItem('cart')) || {};
    if (cart[name]) {
        delete cart[name];
    }
    localStorage.setItem('cart', JSON.stringify(cart));
    renderCart();
    updateCartCount();
    updateButtonStates(); // This is the key change
}

// Update cart count on page load
document.addEventListener('DOMContentLoaded', () => {
    updateCartCount();
    updateButtonStates();
    renderCart(); // To render cart on cart page
});