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Editing:checkout.php

<?php
require_once __DIR__ . '/../includes/config.php';
require_once __DIR__ . '/../includes/db.php';
require_once __DIR__ . '/../includes/functions.php';

$page = 'checkout';
$page_title = 'Checkout';
require_once '../includes/header.php';
require_once '../includes/navbar.php';

$cart_items = get_cart_items();

if (count($cart_items) == 0) {
    header('Location: ' . SITE_URL . 'pages/cart.php');
    exit;
}

// Process Order
if ($_SERVER['REQUEST_METHOD'] == 'POST' && verify_csrf($_POST[CSRF_TOKEN_NAME] ?? '')) {
    $first_name = trim($_POST['first_name']);
    $last_name = trim($_POST['last_name']);
    $email = trim($_POST['email']);
    $phone = trim($_POST['phone']);
    $address_line1 = trim($_POST['address_line1']);
    $address_line2 = trim($_POST['address_line2'] ?? '');
    $city = trim($_POST['city']);
    $state = trim($_POST['state']);
    $zip_code = trim($_POST['zip_code']);
    $country = trim($_POST['country'] ?? 'India');
    $notes = trim($_POST['notes'] ?? '');
    $payment_method = $_POST['payment_method'] ?? 'cod';
    
    $same_as_billing = isset($_POST['same_as_billing']);
    
    $shipping_first_name = $same_as_billing ? $first_name : trim($_POST['shipping_first_name'] ?? $first_name);
    $shipping_last_name = $same_as_billing ? $last_name : trim($_POST['shipping_last_name'] ?? $last_name);
    $shipping_address_line1 = $same_as_billing ? $address_line1 : trim($_POST['shipping_address_line1'] ?? $address_line1);
    $shipping_address_line2 = $same_as_billing ? $address_line2 : trim($_POST['shipping_address_line2'] ?? $address_line2);
    $shipping_city = $same_as_billing ? $city : trim($_POST['shipping_city'] ?? $city);
    $shipping_state = $same_as_billing ? $state : trim($_POST['shipping_state'] ?? $state);
    $shipping_zip_code = $same_as_billing ? $zip_code : trim($_POST['shipping_zip_code'] ?? $zip_code);
    $shipping_country = $same_as_billing ? $country : trim($_POST['shipping_country'] ?? $country);
    
    // Calculate totals
    $subtotal = get_cart_total();
    $shipping_cost = $subtotal >= FREE_SHIPPING_MIN ? 0 : SHIPPING_COST;
    $tax = ($subtotal * TAX_RATE) / 100;
    $discount = 0;
    $coupon_code = null;
    
    if (isset($_SESSION['coupon'])) {
        $discount = calculate_discount($_SESSION['coupon'], $subtotal);
        $coupon_code = $_SESSION['coupon']['code'];
    }
    
    $total = $subtotal + $shipping_cost + $tax - $discount;
    $order_number = generate_order_number();
    
    try {
        $db->beginTransaction();
        
        $user_id = is_logged_in() ? $_SESSION['user_id'] : null;
        
        $stmt = $db->prepare("INSERT INTO orders (order_number, user_id, first_name, last_name, email, phone, address_line1, address_line2, city, state, zip_code, country, shipping_first_name, shipping_last_name, shipping_address_line1, shipping_address_line2, shipping_city, shipping_state, shipping_zip_code, shipping_country, shipping_cost, subtotal, discount, coupon_code, tax, total, payment_method, notes) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
        $stmt->execute([$order_number, $user_id, $first_name, $last_name, $email, $phone, $address_line1, $address_line2, $city, $state, $zip_code, $country, $shipping_first_name, $shipping_last_name, $shipping_address_line1, $shipping_address_line2, $shipping_city, $shipping_state, $shipping_zip_code, $shipping_country, $shipping_cost, $subtotal, $discount, $coupon_code, $tax, $total, $payment_method, $notes]);
        $order_id = $db->lastInsertId();
        
        foreach ($cart_items as $item) {
            $price = $item['sale_price'] > 0 ? $item['sale_price'] : $item['regular_price'];
            $stmt = $db->prepare("INSERT INTO order_items (order_id, product_id, product_name, product_image, variation_details, quantity, price, total) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->execute([$order_id, $item['id'], $item['name'], $item['thumbnail'], $item['variation_details'], $item['quantity'], $price, $price * $item['quantity']]);
            
            // Update stock
            $db->prepare("UPDATE products SET stock_quantity = stock_quantity - ? WHERE id = ?")->execute([$item['quantity'], $item['id']]);
        }
        
        $db->commit();
        
        // Clear cart and coupon
        unset($_SESSION['cart']);
        unset($_SESSION['coupon']);
        
        // Update coupon usage
        if ($coupon_code) {
            $db->prepare("UPDATE coupons SET used_count = used_count + 1 WHERE code = ?")->execute([$coupon_code]);
        }
        
        header('Location: ' . SITE_URL . 'pages/order-success.php?order=' . $order_number);
        exit;
    } catch (Exception $e) {
        $db->rollBack();
        set_flash('error', 'Order placement failed. Please try again.');
    }
}

$cart_total = get_cart_total();
$shipping_cost = $cart_total >= FREE_SHIPPING_MIN ? 0 : SHIPPING_COST;
$tax = ($cart_total * TAX_RATE) / 100;
$discount = isset($_SESSION['coupon']) ? calculate_discount($_SESSION['coupon'], $cart_total) : 0;
$grand_total = $cart_total + $shipping_cost + $tax - $discount;

$current_user = is_logged_in() ? get_user_data() : null;
?>

<main>

<section style="background: var(--light-marble); padding: 20px 0;">
    <div class="container">
        <nav aria-label="breadcrumb">
            <ol class="breadcrumb mb-0">
                <li class="breadcrumb-item"><a href="<?= SITE_URL ?>">Home</a></li>
                <li class="breadcrumb-item"><a href="<?= SITE_URL ?>pages/cart.php">Cart</a></li>
                <li class="breadcrumb-item active">Checkout</li>
            </ol>
        </nav>
    </div>
</section>

<section class="checkout-section" style="padding: 60px 0;">
    <div class="container">
        <?php display_flash(); ?>
        
        <h1 style="font-size: 2.5rem; margin-bottom: 40px;">Checkout</h1>
        
        <form method="POST" class="needs-validation" novalidate>
            <?= csrf_field() ?>
            <div class="row g-4">
                
                <div class="col-lg-7">
                    
                    <div class="checkout-form" style="background: var(--white); border-radius: 16px; padding: 30px; box-shadow: var(--shadow-sm); margin-bottom: 25px;">
                        <h3 style="font-size: 1.3rem; margin-bottom: 25px; font-family: var(--font-primary); font-weight: 600;">
                            <i class="fas fa-user" style="color: var(--primary-rose-gold);"></i> Billing Details
                        </h3>
                        
                        <div class="row g-3">
                            <div class="col-md-6">
                                <label class="form-label">First Name *</label>
                                <input type="text" name="first_name" class="form-control" required value="<?= htmlspecialchars($current_user['first_name'] ?? '') ?>" style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your first name.</div>
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">Last Name *</label>
                                <input type="text" name="last_name" class="form-control" required value="<?= htmlspecialchars($current_user['last_name'] ?? '') ?>" style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your last name.</div>
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">Email Address *</label>
                                <input type="email" name="email" class="form-control" required value="<?= htmlspecialchars($current_user['email'] ?? '') ?>" style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter a valid email.</div>
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">Phone Number *</label>
                                <input type="tel" name="phone" class="form-control" required value="<?= htmlspecialchars($current_user['phone'] ?? '') ?>" style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your phone number.</div>
                            </div>
                            <div class="col-md-12">
                                <label class="form-label">Address *</label>
                                <input type="text" name="address_line1" class="form-control" required placeholder="Street address" style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your address.</div>
                            </div>
                            <div class="col-md-12">
                                <label class="form-label">Apartment, suite, etc. (optional)</label>
                                <input type="text" name="address_line2" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">City *</label>
                                <input type="text" name="city" class="form-control" required style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your city.</div>
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">State *</label>
                                <input type="text" name="state" class="form-control" required style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your state.</div>
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">ZIP / Postal Code *</label>
                                <input type="text" name="zip_code" class="form-control" required style="border-radius: 25px; padding: 10px 20px;">
                                <div class="invalid-feedback">Please enter your ZIP code.</div>
                            </div>
                            <div class="col-md-6">
                                <label class="form-label">Country *</label>
                                <select name="country" class="form-control" required style="border-radius: 25px; padding: 10px 20px;">
                                    <option value="India">India</option>
                                    <option value="USA">United States</option>
                                    <option value="UK">United Kingdom</option>
                                    <option value="UAE">UAE</option>
                                </select>
                            </div>
                        </div>
                    </div>
                    
                    
                    <div class="checkout-form" style="background: var(--white); border-radius: 16px; padding: 30px; box-shadow: var(--shadow-sm); margin-bottom: 25px;">
                        <h3 style="font-size: 1.3rem; margin-bottom: 25px; font-family: var(--font-primary); font-weight: 600;">
                            <i class="fas fa-truck" style="color: var(--primary-rose-gold);"></i> Shipping Address
                        </h3>
                        
                        <div class="form-check mb-3">
                            <input class="form-check-input" type="checkbox" id="same_as_billing" name="same_as_billing" checked>
                            <label class="form-check-label" for="same_as_billing">
                                Same as billing address
                            </label>
                        </div>
                        
                        <div class="shipping-fields" style="display: none;">
                            <div class="row g-3">
                                <div class="col-md-6">
                                    <label class="form-label">First Name *</label>
                                    <input type="text" name="shipping_first_name" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                </div>
                                <div class="col-md-6">
                                    <label class="form-label">Last Name *</label>
                                    <input type="text" name="shipping_last_name" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                </div>
                                <div class="col-md-12">
                                    <label class="form-label">Address *</label>
                                    <input type="text" name="shipping_address_line1" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                </div>
                                <div class="col-md-6">
                                    <label class="form-label">City *</label>
                                    <input type="text" name="shipping_city" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                </div>
                                <div class="col-md-6">
                                    <label class="form-label">State *</label>
                                    <input type="text" name="shipping_state" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                </div>
                                <div class="col-md-6">
                                    <label class="form-label">ZIP Code *</label>
                                    <input type="text" name="shipping_zip_code" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                </div>
                                <div class="col-md-6">
                                    <label class="form-label">Country *</label>
                                    <select name="shipping_country" class="form-control" style="border-radius: 25px; padding: 10px 20px;">
                                        <option value="India">India</option>
                                        <option value="USA">United States</option>
                                        <option value="UK">United Kingdom</option>
                                    </select>
                                </div>
                            </div>
                        </div>
                    </div>
                    
                    
                    <div class="checkout-form" style="background: var(--white); border-radius: 16px; padding: 30px; box-shadow: var(--shadow-sm); margin-bottom: 25px;">
                        <h3 style="font-size: 1.3rem; margin-bottom: 25px; font-family: var(--font-primary); font-weight: 600;">
                            <i class="fas fa-sticky-note" style="color: var(--primary-rose-gold);"></i> Order Notes
                        </h3>
                        <textarea name="notes" class="form-control" rows="4" placeholder="Notes about your order, e.g. special notes for delivery." style="border-radius: 15px; padding: 15px 20px;"></textarea>
                    </div>
                    
                    
                    <div class="checkout-form" style="background: var(--white); border-radius: 16px; padding: 30px; box-shadow: var(--shadow-sm);">
                        <h3 style="font-size: 1.3rem; margin-bottom: 25px; font-family: var(--font-primary); font-weight: 600;">
                            <i class="fas fa-credit-card" style="color: var(--primary-rose-gold);"></i> Payment Method
                        </h3>
                        
                        <div class="payment-methods">
                            <div class="form-check payment-method-item" style="padding: 15px 20px; border: 2px solid var(--gray-200); border-radius: 12px; margin-bottom: 10px; cursor: pointer;">
                                <input class="form-check-input" type="radio" name="payment_method" id="cod" value="cod" checked>
                                <label class="form-check-label" for="cod" style="display: flex; align-items: center; gap: 10px; cursor: pointer; width: 100%;">
                                    <i class="fas fa-money-bill-wave" style="color: var(--primary-rose-gold); font-size: 1.3rem;"></i>
                                    <div>
                                        <strong>Cash on Delivery</strong>
                                        <div style="font-size: 0.85rem; color: var(--gray-600);">Pay with cash upon delivery</div>
                                    </div>
                                </label>
                            </div>
                            
                            <div class="form-check payment-method-item" style="padding: 15px 20px; border: 2px solid var(--gray-200); border-radius: 12px; margin-bottom: 10px; cursor: pointer;">
                                <input class="form-check-input" type="radio" name="payment_method" id="online" value="online">
                                <label class="form-check-label" for="online" style="display: flex; align-items: center; gap: 10px; cursor: pointer; width: 100%;">
                                    <i class="fas fa-credit-card" style="color: var(--primary-rose-gold); font-size: 1.3rem;"></i>
                                    <div>
                                        <strong>Online Payment</strong>
                                        <div style="font-size: 0.85rem; color: var(--gray-600);">Pay securely with card / UPI / Net Banking</div>
                                    </div>
                                </label>
                            </div>
                        </div>
                    </div>
                </div>
                
                
                <div class="col-lg-5">
                    <div class="order-summary" style="background: var(--white); border-radius: 16px; padding: 30px; box-shadow: var(--shadow-sm); position: sticky; top: 100px;">
                        <h3 style="font-size: 1.3rem; margin-bottom: 25px; font-family: var(--font-primary); font-weight: 600;">Your Order</h3>
                        
                        <div style="max-height: 300px; overflow-y: auto; margin-bottom: 20px;">
                            <?php foreach ($cart_items as $item): 
                                $price = $item['sale_price'] > 0 ? $item['sale_price'] : $item['regular_price'];
                                $item_total = $price * $item['quantity'];
                                $image_url = $item['thumbnail'] ? UPLOADS_URL . 'products/' . $item['thumbnail'] : ASSETS_PATH . 'images/no-image.jpg';
                            ?>
                            <div style="display: flex; gap: 15px; padding: 12px 0; border-bottom: 1px solid var(--gray-200);">
                                <img src="<?= $image_url ?>" alt="<?= htmlspecialchars($item['name']) ?>" style="width: 60px; height: 60px; border-radius: 8px; object-fit: cover;">
                                <div style="flex: 1;">
                                    <h6 style="font-family: var(--font-primary); font-size: 0.9rem; margin-bottom: 5px; font-weight: 500;"><?= htmlspecialchars($item['name']) ?></h6>
                                    <small class="text-muted">Qty: <?= $item['quantity'] ?> × <?= format_currency($price) ?></small>
                                </div>
                                <div style="font-weight: 600; color: var(--primary-rose-gold); font-size: 0.9rem;">
                                    <?= format_currency($item_total) ?>
                                </div>
                            </div>
                            <?php endforeach; ?>
                        </div>
                        
                        <div style="border-top: 1px solid var(--gray-200); padding-top: 20px;">
                            <div style="display: flex; justify-content: space-between; margin-bottom: 12px;">
                                <span>Subtotal</span>
                                <span style="font-weight: 600;"><?= format_currency($cart_total) ?></span>
                            </div>
                            <div style="display: flex; justify-content: space-between; margin-bottom: 12px;">
                                <span>Shipping</span>
                                <span style="font-weight: 600;"><?= $shipping_cost > 0 ? format_currency($shipping_cost) : '<span style="color: var(--success);">FREE</span>' ?></span>
                            </div>
                            <div style="display: flex; justify-content: space-between; margin-bottom: 12px;">
                                <span>Tax (<?= TAX_RATE ?>%)</span>
                                <span style="font-weight: 600;"><?= format_currency($tax) ?></span>
                            </div>
                            <?php if ($discount > 0): ?>
                            <div style="display: flex; justify-content: space-between; margin-bottom: 12px; color: var(--success);">
                                <span>Discount</span>
                                <span style="font-weight: 600;">-<?= format_currency($discount) ?></span>
                            </div>
                            <?php endif; ?>
                            
                            <div style="display: flex; justify-content: space-between; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--gray-200); font-size: 1.2rem;">
                                <strong>Total</strong>
                                <strong style="color: var(--primary-rose-gold);"><?= format_currency($grand_total) ?></strong>
                            </div>
                        </div>
                        
                        <button type="submit" class="btn-luxury w-100" style="margin-top: 25px; justify-content: center;">
                            <i class="fas fa-lock"></i> Place Order
                        </button>
                        
                        <p style="text-align: center; margin-top: 15px; font-size: 0.85rem; color: var(--gray-600); margin-bottom: 0;">
                            <i class="fas fa-shield-alt"></i> Your payment information is processed securely
                        </p>
                    </div>
                </div>
            </div>
        </form>
    </div>
</section>

document.getElementById('same_as_billing')?.addEventListener('change', function() {
    document.querySelector('.shipping-fields').style.display = this.checked ? 'none' : 'block';
});
</script>

</main>

<?php require_once '../includes/footer.php'; ?>

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Editing:checkout.php