feuerwehr-vereinsshop/product.php

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

$productId = isset($_GET['id']) ? (int)$_GET['id'] : 0;
$product = getProductById($productId);

if (!$product) {
    header('Location: index.php');
    exit;
}

$pageTitle = $product['name'];

// Handle add to cart
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_to_cart'])) {
    $quantity = isset($_POST['quantity']) ? (int)$_POST['quantity'] : 1;
    $size = isset($_POST['size']) ? sanitize($_POST['size']) : '';
    
    // For apparel, size is required
    if ($product['category'] === 'apparel' && empty($size)) {
        $error = 'Bitte wählen Sie eine Größe aus.';
    } elseif ($quantity < 1) {
        $error = 'Menge muss mindestens 1 sein.';
    } elseif (!checkStock($productId, $quantity, $size)) {
        $sizeInfo = $size ? " für Größe $size" : '';
        $error = "Nicht genügend Lagerbestand verfügbar$sizeInfo.";
    } else {
        // Add to session cart
        if (!isset($_SESSION['cart'])) {
            $_SESSION['cart'] = [];
        }
        
        // For apparel, check if same product with same size already in cart
        $found = false;
        if ($product['category'] === 'apparel') {
            foreach ($_SESSION['cart'] as &$item) {
                if ($item['product_id'] == $productId && isset($item['size']) && $item['size'] === $size) {
                    $item['quantity'] += $quantity;
                    $found = true;
                    break;
                }
            }
        } else {
            foreach ($_SESSION['cart'] as &$item) {
                if ($item['product_id'] == $productId && !isset($item['size'])) {
                    $item['quantity'] += $quantity;
                    $found = true;
                    break;
                }
            }
        }
        
        if (!$found) {
            $cartItem = [
                'product_id' => $productId,
                'quantity' => $quantity
            ];
            if ($product['category'] === 'apparel' && !empty($size)) {
                $cartItem['size'] = $size;
            }
            $_SESSION['cart'][] = $cartItem;
        }
        
        header('Location: cart.php');
        exit;
    }
}

include __DIR__ . '/includes/header.php';
?>

<?php if (isset($error)): ?>
    <div class="alert alert-error">
        <?php echo htmlspecialchars($error); ?>
    </div>
<?php endif; ?>

<div class="product-detail-grid">
    <div>
        <?php if (!empty($product['image']) && file_exists(__DIR__ . '/assets/images/' . $product['image'])): ?>
            <img src="<?php echo SITE_URL; ?>/assets/images/<?php echo htmlspecialchars($product['image']); ?>" alt="<?php echo htmlspecialchars($product['name']); ?>" style="width: 100%; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1);">
        <?php else: ?>
            <div style="width: 100%; height: 400px; background-color: #e9ecef; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #6c757d;">
                Kein Bild verfügbar
            </div>
        <?php endif; ?>
    </div>
    
    <div>
        <h1><?php echo htmlspecialchars($product['name']); ?></h1>
        <div class="price" style="font-size: 2rem; margin: 1rem 0;"><?php echo formatPrice($product['price']); ?></div>
        
        <?php 
        $totalStock = getTotalStock($product);
        $hasStock = $totalStock > 0;
        ?>
        <div class="stock <?php echo $hasStock ? 'in-stock' : 'out-of-stock'; ?>" style="font-size: 1.1rem; margin: 1rem 0;">
            <?php if ($hasStock): ?>
                <?php if ($product['category'] === 'apparel' && isset($product['stock_by_size']) && is_array($product['stock_by_size'])): ?>
                    Verfügbar:
                    <?php 
                    $sizes = is_array($product['sizes']) ? $product['sizes'] : explode(',', $product['sizes']);
                    $stockInfo = [];
                    foreach ($sizes as $sizeOption) {
                        $sizeOption = trim($sizeOption);
                        $sizeStock = isset($product['stock_by_size'][$sizeOption]) ? (int)$product['stock_by_size'][$sizeOption] : 0;
                        if ($sizeStock > 0) {
                            $stockInfo[] = "$sizeOption: $sizeStock";
                        }
                    }
                    echo implode(', ', $stockInfo);
                    if (empty($stockInfo)) {
                        echo 'Ausverkauft';
                    }
                    ?>
                <?php else: ?>
                    Verfügbar (<?php echo $totalStock; ?> Stück)
                <?php endif; ?>
            <?php else: ?>
                Ausverkauft
            <?php endif; ?>
        </div>
        
        <div style="margin: 2rem 0;">
            <h3>Beschreibung</h3>
            <p style="margin-top: 0.5rem; line-height: 1.8;"><?php echo nl2br(htmlspecialchars($product['description'])); ?></p>
        </div>
        
        <?php if ($hasStock): ?>
            <form method="POST" style="margin-top: 2rem;">
                <?php if ($product['category'] === 'apparel' && !empty($product['sizes'])): ?>
                    <div class="form-group">
                        <label for="size">Größe *</label>
                        <select id="size" name="size" required style="width: 100%;" onchange="updateMaxQuantity()">
                            <option value="">Bitte wählen</option>
                            <?php 
                            $sizes = is_array($product['sizes']) ? $product['sizes'] : explode(',', $product['sizes']);
                            $stockBySize = isset($product['stock_by_size']) && is_array($product['stock_by_size']) ? $product['stock_by_size'] : [];
                            foreach ($sizes as $sizeOption): 
                                $sizeOption = trim($sizeOption);
                                $sizeStock = isset($stockBySize[$sizeOption]) ? (int)$stockBySize[$sizeOption] : 0;
                            ?>
                                <option value="<?php echo htmlspecialchars($sizeOption); ?>" data-stock="<?php echo $sizeStock; ?>" <?php echo $sizeStock <= 0 ? 'disabled' : ''; ?>>
                                    <?php echo htmlspecialchars($sizeOption); ?><?php echo $sizeStock <= 0 ? ' (Ausverkauft)' : " ($sizeStock verfügbar)"; ?>
                                </option>
                            <?php endforeach; ?>
                        </select>
                    </div>
                <?php endif; ?>
                <div class="form-group">
                    <label for="quantity">Menge:</label>
                    <input type="number" id="quantity" name="quantity" value="1" min="1" max="<?php echo $totalStock; ?>" class="quantity-input" style="width: 100px;">
                </div>
                <button type="submit" name="add_to_cart" class="btn" style="width: 100%;">In den Warenkorb</button>
            </form>
            <?php if ($product['category'] === 'apparel' && !empty($product['sizes'])): ?>
            <script>
                function updateMaxQuantity() {
                    const sizeSelect = document.getElementById('size');
                    const quantityInput = document.getElementById('quantity');
                    const selectedOption = sizeSelect.options[sizeSelect.selectedIndex];
                    if (selectedOption && selectedOption.value) {
                        const stock = parseInt(selectedOption.getAttribute('data-stock')) || 0;
                        quantityInput.max = stock;
                        if (parseInt(quantityInput.value) > stock) {
                            quantityInput.value = stock > 0 ? stock : 1;
                        }
                    }
                }
            </script>
            <?php endif; ?>
        <?php else: ?>
            <div class="alert alert-error">
                Dieses Produkt ist derzeit nicht verfügbar.
            </div>
        <?php endif; ?>
        
        <div style="margin-top: 2rem;">
            <a href="index.php" class="btn btn-secondary">Zurück zur Übersicht</a>
        </div>
    </div>
</div>

<?php include __DIR__ . '/includes/footer.php'; ?>