import 'package:dio/dio.dart';

const notificationSettingsSaveFailedMessage =
    'Не удалось сохранить настройки уведомлений';


String notificationSettingsUpdateAlertMessage(Object error) {
  final validationMessage = _validationMessage(error);
  if (validationMessage != null) return validationMessage;
  return notificationSettingsSaveFailedMessage;
}

String? _validationMessage(Object error) {
  if (error is! DioException || error.response?.statusCode != 422) return null;

  final data = error.response?.data;
  if (data is! Map) return null;

  final errors = data['errors'];
  if (errors is Map) {
    for (final value in errors.values) {
      final text = _firstErrorText(value);
      if (text != null) return text;
    }
  }

  final message = data['message'];
  if (message is String && message.trim().isNotEmpty) return message.trim();
  return null;
}

String? _firstErrorText(Object? value) {
  if (value is List) {
    for (final item in value) {
      final text = item.toString().trim();
      if (text.isNotEmpty) return text;
    }
    return null;
  }
  if (value is String && value.trim().isNotEmpty) return value.trim();
  return null;
}