import '../../../../../api/marianumcloud/webdav/queries/listFiles/listFilesResponse.dart';
import '../../../infrastructure/loadableState/loading_error.dart';
import '../../../infrastructure/utilityWidgets/loadableHydratedBloc/loadable_hydrated_bloc.dart';
import '../../../infrastructure/utilityWidgets/loadableHydratedBloc/loadable_hydrated_bloc_event.dart';
import '../repository/files_repository.dart';
import 'files_event.dart';
import 'files_state.dart';

class FilesBloc extends LoadableHydratedBloc<FilesEvent, FilesState, FilesRepository> {
  final List<String> initialPath;

  FilesBloc({this.initialPath = const []});

  @override
  FilesRepository repository() => FilesRepository();

  @override
  FilesState fromNothing() => FilesState(currentPath: initialPath);

  @override
  FilesState fromStorage(Map<String, dynamic> json) => FilesState.fromJson(json);

  @override
  Map<String, dynamic>? toStorage(FilesState state) => null;

  @override
  Future<void> gatherData() async {
    final path = innerState?.currentPath ?? initialPath;
    await _query(path);
  }

  Future<void> refresh() async {
    add(RefetchStarted<FilesState>());
    final path = innerState?.currentPath ?? initialPath;
    await _query(path);
  }

  Future<void> setPath(List<String> path) async {
    add(Emit((s) => s.copyWith(currentPath: path, listing: null)));
    add(RefetchStarted<FilesState>());
    await _query(path);
  }

  Future<void> createFolder(String name) async {
    final path = innerState?.currentPath ?? initialPath;
    await repo.data.createFolder('${path.join('/')}/$name');
    await refresh();
  }

  Future<void> _query(List<String> path) async {
    final pathString = path.isEmpty ? '/' : path.join('/');

    Object? capturedError;
    ListFilesResponse? listing;
    try {
      listing = await repo.data.listFiles(
        pathString,
        onCacheData: (cached) {
          // Cached payload arrives before the network call settles. Surface it
          // immediately via Emit so the listing is visible while isLoading
          // stays true and the top loading bar keeps spinning.
          cached.files.removeWhere((file) => file.name.isEmpty || file.name == path.lastOrNull);
          add(Emit((s) => s.copyWith(listing: cached)));
        },
        onError: (e) => capturedError = e,
      );
    } catch (e) {
      capturedError = e;
    }

    if (listing != null) {
      listing.files.removeWhere((file) => file.name.isEmpty || file.name == path.lastOrNull);
      add(DataGathered((s) => s.copyWith(listing: listing)));
    }
    if (capturedError != null) {
      add(Error(LoadingError(
        message: capturedError.toString(),
        allowRetry: true,
      )));
    }
  }
}