<?php
    session_start();
    require '../../../assets/utils/db_auth.php';
    require_role($user_role, ['owner', 'admin', 'staff']);
    require '../../../assets/utils/classes/UsageGuard.php';
    require '../../../assets/utils/classes/InvoiceManager.php';

    try {
        $action = $data['action'] ?? 'update';

        if ($action === 'save_formula') {
            $id         = (int)($data['id'] ?? 0);
            $formula_id = isset($data['formula_id']) && (int)$data['formula_id'] > 0
                ? (int)$data['formula_id'] : null;
            $inv = new InvoiceManager($pdo2, $company_id);
            $inv->saveFormula($id, $formula_id);
            $answer['success'] = 1;
            exit(json_encode($answer));
        }

        $is_new = !(int)($data['id'] ?? 0);

        dbTransaction($pdo2, function($pdo) use ($data, $company_id, $logging) {
            $inv = new InvoiceManager($pdo, $company_id);
            $inv->saveInvoice($data, $logging);
        });

        $answer['success'] = 1;
        if ($is_new) {
            (new UsageGuard($pdo1, $company_id, $packages))->increment();
        }

    } catch (PDOException $e) {
        $answer['message'] = 'Database error, please try again.';
        http_response_code(500);

    } catch (Exception $e) {
        $answer['message'] = $e->getMessage();
        http_response_code(400);
    }

    exit(json_encode($answer));
?>