Flutter how to get BuildContext in ApiService

I have an Flutter app – simple eshop. I need to do a simple call of logout when refresh token expires, but problem is that BuildContext is not available in ApiService where is received info about expired refresh token. I tried BuildContextProvider but it is not called. Does it needs to be somehow initialized, or other solution ?

 class ApiService {
  late final Dio dio;
  static ApiService? _instance;

  factory ApiService() => _instance ??= ApiService._();

  ApiService._() {
    dio = _createDio();
  }

  Dio _createDio() {
    var dio = Dio(BaseOptions(
        baseUrl: FlavorSettings().baseUrl,
        headers: {
          "Accept": "*/*",
          "Content-Type": "application/json",
          "Connection": "keep-alive",
        },
        followRedirects: true,
        connectTimeout: const Duration(seconds: 15),
        receiveTimeout: const Duration(seconds: 15),
        sendTimeout: const Duration(seconds: 15)))
      ..interceptors.add(LogInterceptor(requestBody: true, responseBody: true))
      ..interceptors.add(DioFirebasePerformanceInterceptor());

    (dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
        (HttpClient client) {
      client.badCertificateCallback =
          (X509Certificate cert, String host, int port) => true;
      return client;
    };

    dio.interceptors.addAll({
      AppInterceptors(dio),
    });

    return dio;
  }

  Future<Response> request(String url,
      {dynamic body, String? method, Map<String, dynamic>? headers}) async {
    var res = dio.request(url,
        data: body,
        options: Options(
          method: method,
          headers: headers,
        ));
    return res;
  }

  Future<String> downloadFile(String url, String name) async {
    String dir = (await getTemporaryDirectory()).path;
    var response = await dio.download(
      url,
      '$dir/$name',
    );
    Fimber.d(
        "File download url; $url name: $name ${response.statusCode}  ${response.statusMessage}");
    return '$dir/$name';
  }

  NetworkError? getApiError(Response response) {
    if (response.data == null) {
      return null;
    } else {
      try {
        NetworkError error = NetworkError.fromJson(response.data);
        return error;
      } catch (e) {
        Fimber.d(
            "getApiError ${response.statusCode} ${response.statusMessage} ${response.toString()}");
        return null;
      }
    }
  }
}

class AppInterceptors extends Interceptor {
  final Dio dio;

  AppInterceptors(this.dio);

  @override
  void onRequest(
      RequestOptions options, RequestInterceptorHandler handler) async {
    options.headers['X-Caller'] = UserRepository().xCaller;

    return handler.next(options);
  }

  @override
  void onError(
      DioException dioException, ErrorInterceptorHandler handler) async {
    Fimber.e('API_ERROR:', ex: dioException);
    // refresh token
    if (dioException.type == DioExceptionType.badResponse &&
        dioException.response?.statusCode == 401) {
      Fimber.w("401 unauth");
      _refreshToken();
      _retry(dioException.requestOptions);
    }

    if (dioException.type == DioExceptionType.badResponse &&
        dioException.response?.statusCode == 400 &&
        dioException.requestOptions.path.contains("refreshToken")) {
      Fimber.w("api_auth_service 400 unauth");

      BuildContextProvider()((context) => {
            context.read<LoginCubit>().logout(context),
            Device.showToast(context, "Platnosť prihlásenia vypršala.")
          });

      UserRepository().logout();
    }

    return handler.next(dioException);
  }

  Future<Response<dynamic>> _retry(RequestOptions requestOptions) async {
    final options = Options(
      method: requestOptions.method,
      headers: requestOptions.headers,
    );
    return dio.request<dynamic>(requestOptions.path,
        data: requestOptions.data,
        queryParameters: requestOptions.queryParameters,
        options: options);
  }

  Future<void> _refreshToken() async {
    await UserRepository().refreshToken();
  }
}