prepare("SELECT COUNT(*) FROM drugs d $where");
$count_stmt->execute($params);
$total_rows = $count_stmt->fetchColumn();
$total_pages = ceil($total_rows / $limit);
// Fetch
$sql = "SELECT d.id, d.name_en, d.name_ar, d.min_stock_level, d.reorder_level, d.unit,
COALESCE(SUM(b.quantity), 0) as total_stock
FROM drugs d
LEFT JOIN pharmacy_batches b ON d.id = b.drug_id AND b.quantity > 0 AND b.expiry_date >= CURDATE()
$where
GROUP BY d.id
ORDER BY d.name_en ASC
LIMIT $limit OFFSET $offset";
$stmt = $db->prepare($sql);
$stmt->execute($params);
$drugs = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>