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Editing:product-add.php

<?php
$page = 'products';
$page_title = 'Add New Product';
require_once '../includes/header.php';

$categories = get_categories();
$brands = $db->query("SELECT * FROM brands WHERE status = 1")->fetchAll();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if (verify_csrf($_POST[CSRF_TOKEN_NAME] ?? '')) {
        $name = trim($_POST['name']);
        $slug = create_slug($name) . '-' . uniqid();
        $category_id = intval($_POST['category_id']);
        $subcategory_id = !empty($_POST['subcategory_id']) ? intval($_POST['subcategory_id']) : null;
        $brand_id = !empty($_POST['brand_id']) ? intval($_POST['brand_id']) : null;
        $short_description = trim($_POST['short_description'] ?? '');
        $description = trim($_POST['description'] ?? '');
        $specifications = trim($_POST['specifications'] ?? '');
        $regular_price = floatval($_POST['regular_price']);
        $sale_price = !empty($_POST['sale_price']) ? floatval($_POST['sale_price']) : null;
        $sku = trim($_POST['sku'] ?? '');
        $sku = $sku !== '' ? $sku : null; // NULL instead of empty string to avoid UNIQUE conflicts
        $stock_quantity = intval($_POST['stock_quantity'] ?? 0);
        $stock_status = $_POST['stock_status'] ?? 'in_stock';
        $tags = trim($_POST['tags'] ?? '');
        $meta_title = trim($_POST['meta_title'] ?? '');
        $meta_description = trim($_POST['meta_description'] ?? '');
        $featured = isset($_POST['featured']) ? 1 : 0;
        $best_seller = isset($_POST['best_seller']) ? 1 : 0;
        $new_arrival = isset($_POST['new_arrival']) ? 1 : 0;
        
        $discount = 0;
        if ($sale_price && $regular_price > 0) {
            $discount = (int)round((($regular_price - $sale_price) / $regular_price) * 100);
        }
        
        // Handle thumbnail upload
        $thumbnail = '';
        if (isset($_FILES['thumbnail']) && $_FILES['thumbnail']['error'] == 0) {
            $thumbnail = upload_image($_FILES['thumbnail'], 'products', $name);
            if (!$thumbnail) {
                $error = 'Image upload failed. Please check that the file is JPG/PNG/GIF/WebP and under 5MB, and that assets/uploads/products/ folder is writable.';
            }
        } elseif (isset($_FILES['thumbnail']) && $_FILES['thumbnail']['error'] != 0 && $_FILES['thumbnail']['error'] != 4) {
            // Error 4 = no file uploaded, that's fine
            $error = 'Image upload error (code: ' . $_FILES['thumbnail']['error'] . '). Please try again.';
        }
        
        if (!isset($error)) {
            try {
                $db->beginTransaction();
                
                $stmt = $db->prepare("INSERT INTO products (category_id, subcategory_id, brand_id, name, slug, short_description, description, specifications, regular_price, sale_price, discount_percent, sku, stock_quantity, stock_status, featured, best_seller, new_arrival, thumbnail, tags, meta_title, meta_description) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
                $stmt->execute([$category_id, $subcategory_id, $brand_id, $name, $slug, $short_description, $description, $specifications, $regular_price, $sale_price, $discount, $sku, $stock_quantity, $stock_status, $featured, $best_seller, $new_arrival, $thumbnail, $tags, $meta_title, $meta_description]);
                $product_id = $db->lastInsertId();
                
                // Handle additional images
                if (isset($_FILES['images']) && !empty($_FILES['images']['name'][0])) {
                    $count = count($_FILES['images']['name']);
                    for ($i = 0; $i < $count; $i++) {
                        if ($_FILES['images']['error'][$i] == 0) {
                            $file = [
                                'name' => $_FILES['images']['name'][$i],
                                'type' => $_FILES['images']['type'][$i],
                                'tmp_name' => $_FILES['images']['tmp_name'][$i],
                                'error' => $_FILES['images']['error'][$i],
                                'size' => $_FILES['images']['size'][$i]
                            ];
                            $image = upload_image($file, 'products', $name . '-' . $i);
                            if ($image) {
                                $db->prepare("INSERT INTO product_images (product_id, image, sort_order) VALUES (?, ?, ?)")
                                   ->execute([$product_id, $image, $i]);
                            }
                        }
                    }
                }
                
                $db->commit();
                admin_set_flash('success', 'Product added successfully');
                header('Location: ' . ADMIN_PATH . 'pages/products.php');
                exit;
            } catch (Exception $e) {
                if ($db->inTransaction()) {
                    $db->rollBack();
                }
                $error = 'Failed to add product: ' . $e->getMessage();
            }
        }
    } else {
        $error = 'Security token expired. Please refresh the page and try again.';
    }
}
?>

<div class="admin-card">
    <?php if (isset($error)): ?>
    <div class="alert alert-danger"><?= htmlspecialchars($error) ?></div>
    <?php endif; ?>
    
    <form method="POST" enctype="multipart/form-data">
        <?= csrf_field() ?>
        
        <div class="row g-4">
            
            <div class="col-lg-8">
                <h5 style="margin-bottom: 20px; color: var(--primary-rose-gold);">Basic Information</h5>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Product Name *</label>
                    <input type="text" name="name" class="form-control-admin" required>
                </div>
                
                <div class="row g-3">
                    <div class="col-md-6">
                        <div class="form-group-admin">
                            <label class="form-label-admin">Category *</label>
                            <select name="category_id" class="form-control-admin" required>
                                <option value="">Select Category</option>
                                <?php foreach ($categories as $cat): ?>
                                <option value="<?= $cat['id'] ?>"><?= htmlspecialchars($cat['name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                    </div>
                    <div class="col-md-6">
                        <div class="form-group-admin">
                            <label class="form-label-admin">Brand</label>
                            <select name="brand_id" class="form-control-admin">
                                <option value="">Select Brand</option>
                                <?php foreach ($brands as $brand): ?>
                                <option value="<?= $brand['id'] ?>"><?= htmlspecialchars($brand['name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                    </div>
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Short Description</label>
                    <textarea name="short_description" class="form-control-admin" rows="2"></textarea>
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Full Description</label>
                    <textarea name="description" class="form-control-admin" rows="6"></textarea>
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Specifications (JSON format)</label>
                    <textarea name="specifications" class="form-control-admin" rows="3" placeholder='{"Material": "Cotton", "Color": "Red", "Size": "M, L, XL"}'></textarea>
                </div>
            </div>
            
            
            <div class="col-lg-4">
                <h5 style="margin-bottom: 20px; color: var(--primary-rose-gold);">Pricing & Inventory</h5>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Regular Price (₹) *</label>
                    <input type="number" name="regular_price" class="form-control-admin" step="0.01" min="0" required>
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Sale Price (₹)</label>
                    <input type="number" name="sale_price" class="form-control-admin" step="0.01" min="0">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">SKU</label>
                    <input type="text" name="sku" class="form-control-admin">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Stock Quantity *</label>
                    <input type="number" name="stock_quantity" class="form-control-admin" min="0" value="0" required>
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Stock Status</label>
                    <select name="stock_status" class="form-control-admin">
                        <option value="in_stock">In Stock</option>
                        <option value="out_of_stock">Out of Stock</option>
                        <option value="pre_order">Pre-Order</option>
                    </select>
                </div>
                
                <h5 style="margin: 20px 0 15px; color: var(--primary-rose-gold);">Visibility</h5>
                
                <div class="form-group-admin">
                    <div class="form-check">
                        <input class="form-check-input" type="checkbox" id="featured" name="featured">
                        <label class="form-check-label" for="featured">Featured Product</label>
                    </div>
                    <div class="form-check">
                        <input class="form-check-input" type="checkbox" id="best_seller" name="best_seller">
                        <label class="form-check-label" for="best_seller">Best Seller</label>
                    </div>
                    <div class="form-check">
                        <input class="form-check-input" type="checkbox" id="new_arrival" name="new_arrival" checked>
                        <label class="form-check-label" for="new_arrival">New Arrival</label>
                    </div>
                </div>
            </div>
        </div>
        
        <hr style="margin: 30px 0;">
        
        
        <h5 style="margin-bottom: 20px; color: var(--primary-rose-gold);">Product Images</h5>
        <div class="row g-3">
            <div class="col-md-6">
                <div class="form-group-admin">
                    <label class="form-label-admin">Main Thumbnail</label>
                    <input type="file" name="thumbnail" class="form-control-admin" accept="image/*" data-preview="thumb-preview" id="thumbnail-input">
                </div>
                <img id="thumb-preview" class="image-preview image-preview-lg" style="display: none; margin-top: 10px; max-width: 200px;" onerror="this.onerror=null;this.src='<?= ASSETS_PATH ?>images/no-image.jpg';">
                <div id="thumb-error" class="text-danger small" style="display: none; margin-top: 5px;"></div>
            </div>
            <div class="col-md-6">
                <div class="form-group-admin">
                    <label class="form-label-admin">Additional Images (Multiple)</label>
                    <input type="file" name="images[]" class="form-control-admin" accept="image/*" multiple id="images-input">
                    <small class="text-muted">You can select multiple images (JPG, PNG, GIF, WebP — max 5MB each)</small>
                </div>
                <div id="images-preview" class="d-flex flex-wrap gap-2 mt-2"></div>
            </div>
        </div>
        
        <hr style="margin: 30px 0;">
        
        
        <h5 style="margin-bottom: 20px; color: var(--primary-rose-gold);">SEO & Tags</h5>
        <div class="row g-3">
            <div class="col-md-12">
                <div class="form-group-admin">
                    <label class="form-label-admin">Tags (comma separated)</label>
                    <input type="text" name="tags" class="form-control-admin" placeholder="luxury, premium, gift">
                </div>
            </div>
            <div class="col-md-12">
                <div class="form-group-admin">
                    <label class="form-label-admin">Meta Title</label>
                    <input type="text" name="meta_title" class="form-control-admin">
                </div>
            </div>
            <div class="col-md-12">
                <div class="form-group-admin">
                    <label class="form-label-admin">Meta Description</label>
                    <textarea name="meta_description" class="form-control-admin" rows="2"></textarea>
                </div>
            </div>
        </div>
        
        <hr style="margin: 30px 0;">
        
        <div class="d-flex gap-2">
            <button type="submit" class="btn-admin btn-primary-admin">
                <i class="fas fa-save"></i> Save Product
            </button>
            <a href="<?= ADMIN_PATH ?>pages/products.php" class="btn-admin btn-secondary-admin">Cancel</a>
        </div>
    </form>
</div>

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

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Editing:product-add.php