<?php
    session_start();
    require '../../../assets/utils/db_auth.php';

    require_role($user_role, ['owner', 'admin']);

    // ─── Encrypt password — same method/key/iv as config.php ─────────────────
    function encrypt_password(string $plain): string {
        global $pinkey, $method, $iv;
        return openssl_encrypt($plain, $method, $pinkey, 0, $iv);
    }

    try {

        $server      = trim($data['smtp_host']       ?? '');
        $port        = trim($data['smtp_port']        ?? '587');
        $username    = trim($data['smtp_username']    ?? '');
        $raw_pass    = $data['smtp_password']         ?? '';   // blank = keep current
        $from_name   = trim($data['smtp_from_name']   ?? '');
        $from_email  = trim($data['smtp_from_email']  ?? '');
        $encryption  = trim($data['smtp_encryption']  ?? 'tls');

        if (!$server || !$username) {
            $answer['message'] = 'SMTP host and username are required.';
            http_response_code(422);
            exit(json_encode($answer));
        }

        if (!in_array($port, ['25', '465', '587'], true)) $port = '587';
        if (!in_array($encryption, ['tls', 'ssl', 'none'], true)) $encryption = 'tls';

        // Check if row already exists (uses pdo1 — company_smtp lives in wms2)
        $sth = $pdo1->prepare("
            SELECT smtp_id FROM company_smtp
            WHERE company_id = :company_id LIMIT 1
        ");
        $sth->execute([':company_id' => $company_id]);
        db_check($sth, $answer);
        $existing_id = $sth->fetchColumn();

        if ($existing_id) {

            if ($raw_pass !== '') {
                $sth = $pdo1->prepare("
                    UPDATE company_smtp SET
                        server      = :server,
                        port        = :port,
                        username    = :username,
                        password    = :password,
                        from_name   = :from_name,
                        from_email  = :from_email,
                        encryption  = :encryption,
                        updated_at  = NOW()
                    WHERE smtp_id = :smtp_id
                ");
                $sth->execute([
                    ':server'     => $server,
                    ':port'       => $port,
                    ':username'   => $username,
                    ':password'   => encrypt_password($raw_pass),
                    ':from_name'  => $from_name,
                    ':from_email' => $from_email,
                    ':encryption' => $encryption,
                    ':smtp_id'    => $existing_id,
                ]);
            } else {
                // Keep existing password — don't touch it
                $sth = $pdo1->prepare("
                    UPDATE company_smtp SET
                        server      = :server,
                        port        = :port,
                        username    = :username,
                        from_name   = :from_name,
                        from_email  = :from_email,
                        encryption  = :encryption,
                        updated_at  = NOW()
                    WHERE smtp_id = :smtp_id
                ");
                $sth->execute([
                    ':server'     => $server,
                    ':port'       => $port,
                    ':username'   => $username,
                    ':from_name'  => $from_name,
                    ':from_email' => $from_email,
                    ':encryption' => $encryption,
                    ':smtp_id'    => $existing_id,
                ]);
            }

        } else {

            // New record — password required
            if ($raw_pass === '') {
                $answer['message'] = 'Password is required for a new SMTP configuration.';
                http_response_code(422);
                exit(json_encode($answer));
            }

            $sth = $pdo1->prepare("
                INSERT INTO company_smtp
                    (company_id, server, port, username, password,
                     from_name, from_email, encryption, updated_at)
                VALUES
                    (:company_id, :server, :port, :username, :password,
                     :from_name, :from_email, :encryption, NOW())
            ");
            $sth->execute([
                ':company_id' => $company_id,
                ':server'     => $server,
                ':port'       => $port,
                ':username'   => $username,
                ':password'   => encrypt_password($raw_pass),
                ':from_name'  => $from_name,
                ':from_email' => $from_email,
                ':encryption' => $encryption,
            ]);

        }

        db_check($sth, $answer);

        $answer['success'] = 1;
        $answer['message'] = 'SMTP settings saved.';

    } catch (Exception $e) {
        $answer['message'] = 'Failed to save SMTP settings.';
        http_response_code(500);
    }

    exit(json_encode($answer));
?>