, headers get sent and header()
// would silently fail. A relative Location needs no SITE_URL, so it works here.
if (isset($_GET['page']) && (int)($_GET['page']) > 1) {
    $__p = $_GET;
    unset($__p['page']);
    $__qs = http_build_query($__p);
    header('Location: products.php' . ($__qs !== '' ? '?' . $__qs : ''), true, 302);
    exit;
}
// ---------------------------------------------------------------------------
require_once __DIR__ . '/config.php';
require_once __DIR__ . '/includes/url_helpers.php';
require_once __DIR__ . '/includes/breadcrumb_helpers.php';
require_once __DIR__ . '/includes/social_proof_helpers.php';

$selected_slug = isset($_GET['category']) ? trim($_GET['category']) : '';
$selected_brand = isset($_GET['brand']) ? trim($_GET['brand']) : '';
$min_price = isset($_GET['min_price']) && $_GET['min_price'] !== '' ? (float)$_GET['min_price'] : null;
$max_price = isset($_GET['max_price']) && $_GET['max_price'] !== '' ? (float)$_GET['max_price'] : null;
$sort = isset($_GET['sort']) ? $_GET['sort'] : 'newest';
$search_q = isset($_GET['q']) ? trim($_GET['q']) : '';
$page = max(1, (int)($_GET['page'] ?? 1));
$is_mobile_ua = preg_match('/Mobi|Android(?!.*Tablet)|iPhone/i', $_SERVER['HTTP_USER_AGENT'] ?? '');
$per_page = $is_mobile_ua ? 6 : 8;

$page_title = $search_q !== '' ? 'Search: ' . htmlspecialchars($search_q) . ' — MobiCare.pk' : ($selected_slug ? ucwords(str_replace('-', ' ', $selected_slug)) . ' — MobiCare.pk' : 'All Products — MobiCare.pk');
$meta_description = 'Browse mobile accessories including power banks, cables, chargers, earbuds and smart watches at MobiCare.pk.';

// Look up the selected category early so we can use its name + custom meta
// description (if set) in the page's <title>/<meta> tags before header.php runs.
$selected_category_row = null;
if ($selected_slug !== '') {
    $cat_stmt = $conn->prepare("SELECT * FROM categories WHERE slug = ?");
    $cat_stmt->bind_param('s', $selected_slug);
    $cat_stmt->execute();
    $selected_category_row = $cat_stmt->get_result()->fetch_assoc();
    if ($selected_category_row) {
        $page_title = $selected_category_row['name'] . ' — MobiCare.pk';
        if (!empty($selected_category_row['meta_description'])) {
            $meta_description = $selected_category_row['meta_description'];
        }
    }
}

// Canonical URL intentionally drops sort/min_price/max_price/brand — those
// are refinements of the same listing, not distinct pages, so we don't want
// Google treating every filter combination as separate content to index.
// Category, search term, and pagination ARE kept, since those represent
// genuinely different listings.
$canonical_params = [];
if ($selected_slug !== '') $canonical_params['category'] = $selected_slug;
if ($search_q !== '') $canonical_params['q'] = $search_q;
if ($page > 1) $canonical_params['page'] = $page;
$canonical_url = SITE_URL . '/products.php' . (!empty($canonical_params) ? '?' . http_build_query($canonical_params) : '');

// Keep search-result pages out of the index (thin, unbounded). Plain category
// pages and their pagination stay indexable; sort/brand/price permutations
// already collapse to the clean category via the canonical above.
$robots_noindex = ($search_q !== '');

require_once __DIR__ . '/includes/header.php';

$cats = $conn->query("SELECT * FROM categories ORDER BY name ASC");
$all_cats = [];
while ($row = $cats->fetch_assoc()) $all_cats[] = $row;
require_once __DIR__ . '/includes/category_helpers.php';
$cat_tree = get_category_tree($conn); // top-level cats, each with a 'children' array

$brands_result = $conn->query("SELECT DISTINCT brand FROM products WHERE brand IS NOT NULL AND brand != '' ORDER BY brand ASC");
$all_brands = [];
while ($row = $brands_result->fetch_assoc()) $all_brands[] = $row['brand'];

require_once __DIR__ . '/includes/product_query.php';
$pq = mobicare_build_product_query($conn, [
    'selected_slug'  => $selected_slug,
    'selected_brand' => $selected_brand,
    'min_price'      => $min_price,
    'max_price'      => $max_price,
    'search_q'       => $search_q,
    'sort'           => $sort,
    'page'           => $page,
    'per_page'       => $per_page,
]);
$products       = $pq['products'];
$total_products = $pq['total_products'];
$total_pages    = $pq['total_pages'];
$page           = $pq['page'];
$offset         = $pq['offset'];

// Helper to keep current filters when building links
function qs($overrides = []) {
    $current = $_GET;
    foreach ($overrides as $k => $v) {
        if ($v === null) unset($current[$k]);
        else $current[$k] = $v;
    }
    return '?' . http_build_query($current);
}
?>

<div class="wrap">