if ($type === 'sales' || $type === 'purchases') {
        $table = ($type === 'sales') ? 'invoices' : 'purchases';
        $cust_table = ($type === 'sales') ? 'customers' : 'suppliers';
        $cust_col = ($type === 'sales') ? 'customer_id' : 'supplier_id';
        
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $s = $_GET['search'];
            $clean_id = preg_replace('/[^0-9]/', '', $s);
            if ($clean_id !== '') {
                $where[] = "(v.id LIKE ? OR c.name LIKE ? OR v.id = ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = $clean_id;
            } else {
                $where[] = "(v.id LIKE ? OR c.name LIKE ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
            }
        }
        if (!empty($_GET['customer_id'])) { $where[] = "v.$cust_col = ?"; $params[] = $_GET['customer_id']; }
        if (!empty($_GET['start_date'])) { $where[] = "v.invoice_date >= ?"; $params[] = $_GET['start_date']; }
        if (!empty($_GET['end_date'])) { $where[] = "v.invoice_date <= ?"; $params[] = $_GET['end_date']; }
        $whereSql = implode(" AND ", $where);
        
--
        $stmt->execute($params);
        $headers = ['Invoice ID', 'Customer/Supplier', 'Date', 'Payment', 'Status', 'Total', 'Paid', 'Balance'];
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) $rows[] = $row;
    } elseif ($type === 'customers' || $type === 'suppliers') {
        $table = ($type === 'suppliers') ? 'suppliers' : 'customers';
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) { $where[] = "(name LIKE ? OR email LIKE ? OR phone LIKE ? OR tax_id LIKE ?)"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; }
        if (!empty($_GET['start_date'])) { $where[] = "DATE(created_at) >= ?"; $params[] = $_GET['start_date']; }
        if (!empty($_GET['end_date'])) { $where[] = "DATE(created_at) <= ?"; $params[] = $_GET['end_date']; }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT id, name, email, phone, tax_id, balance, created_at FROM $table WHERE $whereSql ORDER BY id DESC");
        $stmt->execute($params);
        $headers = ['ID', 'Name', 'Email', 'Phone', 'Tax ID', 'Balance', 'Created At'];
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) $rows[] = $row;
    } elseif ($type === 'items') {
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) { $where[] = "(i.name_en LIKE ? OR i.name_ar LIKE ? OR i.sku LIKE ?)"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT i.sku, i.name_en, i.name_ar, c.name_en as category, i.purchase_price, i.sale_price, i.stock_quantity, i.vat_rate 
                               FROM stock_items i LEFT JOIN stock_categories c ON i.category_id = c.id 
                               WHERE $whereSql ORDER BY i.id DESC");
        $stmt->execute($params);
        $headers = ['SKU', 'Name (EN)', 'Name (AR)', 'Category', 'Purchase Price', 'Sale Price', 'Quantity', 'VAT %'];
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) $rows[] = $row;
    } elseif ($type === 'expenses') {
        $where = ["1=1"];
        $params = [];
        $stmt = db()->prepare("SELECT e.id, c.name_en as category, e.amount, e.expense_date, e.reference_no, e.description 
                               FROM expenses e JOIN expense_categories c ON e.category_id = c.id 
                               ORDER BY e.expense_date DESC");
        $stmt->execute();
        $headers = ['ID', 'Category', 'Amount', 'Date', 'Reference', 'Description'];
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) $rows[] = $row;
    } elseif ($type === 'quotations') {
        $stmt = db()->prepare("SELECT q.id, c.name as customer_name, q.quotation_date, q.total_with_vat, q.status 
                               FROM quotations q JOIN customers c ON q.customer_id = c.id 
                               ORDER BY q.id DESC");
        $stmt->execute();
        $headers = ['Quotation #', 'Customer', 'Date', 'Total', 'Status'];
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) $rows[] = $row;
    } elseif ($type === 'lpos') {
        $stmt = db()->prepare("SELECT q.id, s.name as supplier_name, q.lpo_date, q.total_with_vat, q.status 
                               FROM lpos q JOIN suppliers s ON q.supplier_id = s.id 
                               ORDER BY q.id DESC");
        $stmt->execute();
        $headers = ['LPO #', 'Supplier', 'Date', 'Total', 'Status'];
--
$page_num = isset($_GET["p"]) ? (int)$_GET["p"] : 1;
if ($page_num < 1) $page_num = 1;
$offset = ($page_num - 1) * $limit;
switch ($page) {
    case 'suppliers':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $where[] = "(name LIKE ? OR email LIKE ? OR phone LIKE ? OR tax_id LIKE ?)";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
        }
        if (!empty($_GET['start_date'])) {
            $where[] = "DATE(created_at) >= ?";
            $params[] = $_GET['start_date'];
        }
        if (!empty($_GET['end_date'])) {
            $where[] = "DATE(created_at) <= ?";
            $params[] = $_GET['end_date'];
        }
        $whereSql = implode(" AND ", $where);
        
        $countStmt = db()->prepare("SELECT COUNT(*) FROM suppliers WHERE $whereSql");
        $countStmt->execute($params);
--
        $stmt = db()->prepare("SELECT * FROM suppliers WHERE $whereSql ORDER BY id DESC LIMIT $limit OFFSET $offset");
        $stmt->execute($params);
        $data['customers'] = $stmt->fetchAll(); // Keep 'customers' key for template compatibility if needed, or update template
        break;
    case 'customers':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $where[] = "(name LIKE ? OR email LIKE ? OR phone LIKE ? OR tax_id LIKE ?)";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
        }
        if (!empty($_GET['start_date'])) {
            $where[] = "DATE(created_at) >= ?";
            $params[] = $_GET['start_date'];
        }
        if (!empty($_GET['end_date'])) {
            $where[] = "DATE(created_at) <= ?";
            $params[] = $_GET['end_date'];
        }
        $whereSql = implode(" AND ", $where);
        
        $countStmt = db()->prepare("SELECT COUNT(*) FROM customers WHERE $whereSql");
        $countStmt->execute($params);
--
    case 'units':
        // Already fetched globally
        break;
    case 'items':
        file_put_contents('debug.log', date('Y-m-d H:i:s') . " - Items case hit\n", FILE_APPEND);
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $where[] = "(i.name_en LIKE ? OR i.name_ar LIKE ? OR i.sku LIKE ?)";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
        }
        $whereSql = implode(" AND ", $where);
        
        $countStmt = db()->prepare("SELECT COUNT(*) FROM stock_items i 
                                      LEFT JOIN stock_categories c ON i.category_id = c.id 
                                      LEFT JOIN stock_units u ON i.unit_id = u.id 
                                      LEFT JOIN suppliers s ON i.supplier_id = s.id WHERE $whereSql");
        $countStmt->execute($params);
        $total_records = (int)$countStmt->fetchColumn();
        $data['total_pages'] = ceil($total_records / $limit);
        $data['current_page'] = $page_num;

        $stmt = db()->prepare("SELECT i.*, c.name_en as cat_en, c.name_ar as cat_ar, u.short_name_en as unit_en, u.short_name_ar as unit_ar, s.name as supplier_name 
                                      FROM stock_items i 
--
                                      ORDER BY i.id DESC LIMIT $limit OFFSET $offset");
        $stmt->execute($params);
        $data['items'] = $stmt->fetchAll();
        break;
    case 'quotations':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $s = $_GET['search'];
            $clean_id = preg_replace('/[^0-9]/', '', $s);
            if ($clean_id !== '') {
                $where[] = "(q.id LIKE ? OR c.name LIKE ? OR q.id = ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = $clean_id;
            } else {
                $where[] = "(q.id LIKE ? OR c.name LIKE ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
            }
        }
        if (!empty($_GET['customer_id'])) {
            $where[] = "q.customer_id = ?";
            $params[] = $_GET['customer_id'];
        }
        if (!empty($_GET['start_date'])) {
--
                                      LIMIT $limit OFFSET $offset");
        $stmt->execute($params);
        $data['quotations'] = $stmt->fetchAll();
        break;
    case 'lpos':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $s = $_GET['search'];
            $clean_id = preg_replace('/[^0-9]/', '', $s);
            if ($clean_id !== '') {
                $where[] = "(q.id LIKE ? OR s.name LIKE ? OR q.id = ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = $clean_id;
            } else {
                $where[] = "(q.id LIKE ? OR s.name LIKE ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
            }
        }
        if (!empty($_GET['supplier_id'])) {
            $where[] = "q.supplier_id = ?";
            $params[] = $_GET['supplier_id'];
        }
        if (!empty($_GET['start_date'])) {
--
        $type = ($page === 'sales') ? 'sale' : 'purchase';
        $table = ($type === 'purchase') ? 'purchases' : 'invoices';
        $cust_supplier_col = ($type === 'purchase') ? 'supplier_id' : 'customer_id';
        $cust_supplier_table = ($type === 'purchase') ? 'suppliers' : 'customers';
        
        $where = ["1=1"];
        $params = [];
        
        if (!empty($_GET['search'])) {
            $s = $_GET['search'];
            $clean_id = preg_replace('/[^0-9]/', '', $s);
            if ($clean_id !== '') {
                $where[] = "(v.id LIKE ? OR c.name LIKE ? OR v.id = ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = $clean_id;
            } else {
                $where[] = "(v.id LIKE ? OR c.name LIKE ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
            }
        }
        
        if (!empty($_GET['customer_id'])) {
            $where[] = "v.$cust_supplier_col = ?";
            $params[] = $_GET['customer_id'];
--
            $data['purchase_invoices'] = db()->query("SELECT id, invoice_date, total_with_vat FROM purchases ORDER BY id DESC")->fetchAll();
        }
        break;

    case 'sales_returns':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $s = $_GET['search'];
            $clean_id = preg_replace('/[^0-9]/', '', $s);
            if ($clean_id !== '') {
                $where[] = "(sr.id LIKE ? OR c.name LIKE ? OR sr.invoice_id LIKE ? OR sr.id = ? OR sr.invoice_id = ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = $clean_id;
                $params[] = $clean_id;
            } else {
                $where[] = "(sr.id LIKE ? OR c.name LIKE ? OR sr.invoice_id LIKE ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = "%$s%";
            }
        }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT sr.*, c.name as customer_name, i.total_with_vat as invoice_total 
--
        $data['returns'] = $stmt->fetchAll();
        $data['sales_invoices'] = db()->query("SELECT id, invoice_date, total_with_vat FROM invoices ORDER BY id DESC")->fetchAll();
        break;

    case 'purchase_returns':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $s = $_GET['search'];
            $clean_id = preg_replace('/[^0-9]/', '', $s);
            if ($clean_id !== '') {
                $where[] = "(pr.id LIKE ? OR c.name LIKE ? OR pr.purchase_id LIKE ? OR pr.id = ? OR pr.purchase_id = ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = $clean_id;
                $params[] = $clean_id;
            } else {
                $where[] = "(pr.id LIKE ? OR c.name LIKE ? OR pr.purchase_id LIKE ?)";
                $params[] = "%$s%";
                $params[] = "%$s%";
                $params[] = "%$s%";
            }
        }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT pr.*, c.name as supplier_name, i.total_with_vat as invoice_total 
--
        break;
    case 'expense_categories':
        $data['expense_categories'] = db()->query("SELECT * FROM expense_categories ORDER BY name_en ASC")->fetchAll();
        break;
    case 'expenses':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['category_id'])) {
            $where[] = "e.category_id = ?";
            $params[] = $_GET['category_id'];
        }
        if (!empty($_GET['start_date'])) {
            $where[] = "e.expense_date >= ?";
            $params[] = $_GET['start_date'];
        }
        if (!empty($_GET['end_date'])) {
            $where[] = "e.expense_date <= ?";
            $params[] = $_GET['end_date'];
        }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT e.*, c.name_en as cat_en, c.name_ar as cat_ar 
                               FROM expenses e 
                               LEFT JOIN expense_categories c ON e.category_id = c.id 
                               WHERE $whereSql 
                               ORDER BY e.expense_date DESC, e.id DESC");
        $stmt->execute($params);
--
        $data['year'] = $year;
        $data['payroll'] = db()->query("SELECT p.*, e.name as emp_name FROM hr_payroll p JOIN hr_employees e ON p.employee_id = e.id WHERE p.payroll_month = $month AND p.payroll_year = $year ORDER BY p.id DESC")->fetchAll();
        $data['employees'] = db()->query("SELECT id, name, salary FROM hr_employees WHERE status = 'active' ORDER BY name ASC")->fetchAll();
        break;
    case 'loyalty_history':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['customer_id'])) {
            $where[] = "lt.customer_id = ?";
            $params[] = (int)$_GET['customer_id'];
        }
        if (!empty($_GET['type'])) {
            $where[] = "lt.transaction_type = ?";
            $params[] = $_GET['type'];
        }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT lt.*, c.name as customer_name, c.loyalty_tier, c.loyalty_points 
                               FROM loyalty_transactions lt 
                               JOIN customers c ON lt.customer_id = c.id 
                               WHERE $whereSql 
                               ORDER BY lt.created_at DESC");
        $stmt->execute($params);
        $data['loyalty_transactions'] = $stmt->fetchAll();
        break;
    case 'devices':
        $data['devices'] = db()->query("SELECT * FROM hr_biometric_devices ORDER BY id DESC")->fetchAll();
--
        break;
    case 'cash_registers':
        $data['cash_registers'] = db()->query("SELECT * FROM cash_registers ORDER BY id DESC")->fetchAll();
        break;
    case 'register_sessions':
        $where = ["1=1"];
        $params = [];
        
        // Filter by user if provided and user has permission
        if (isset($_GET['user_id']) && !empty($_GET['user_id'])) {
            if (can('users_view')) {
                $where[] = "s.user_id = ?";
                $params[] = $_GET['user_id'];
            }
        }
        
        if (!can('users_view')) {
            $where[] = "s.user_id = ?";
            $params[] = $_SESSION['user_id'];
        }

        // Filter by date range
        if (isset($_GET['date_from']) && !empty($_GET['date_from'])) {
            $where[] = "s.opened_at >= ?";
            $params[] = $_GET['date_from'] . ' 00:00:00';
        }