part of '../neon_files.dart';

/// Mode to operate the [FilesBrowserView] in.
enum FilesBrowserMode {
  /// Default file browser mode.
  ///
  /// When a file is selected it will be opened or downloaded.
  browser,

  /// Select directory.
  selectDirectory,

  /// Don't show file actions.
  noActions,
}

class FilesBrowserView extends StatefulWidget {
  const FilesBrowserView({
    required this.bloc,
    required this.filesBloc,
    this.mode = FilesBrowserMode.browser,
    super.key,
  });

  final FilesBrowserBloc bloc;
  final FilesBloc filesBloc;
  final FilesBrowserMode mode;

  @override
  State<FilesBrowserView> createState() => _FilesBrowserViewState();
}

class _FilesBrowserViewState extends State<FilesBrowserView> {
  @override
  void initState() {
    widget.bloc.errors.listen((final error) {
      NeonError.showSnackbar(context, error);
    });

    super.initState();
  }

  @override
  Widget build(final BuildContext context) => ResultBuilder<List<WebDavFile>>.behaviorSubject(
        subject: widget.bloc.files,
        builder: (final context, final filesSnapshot) => StreamBuilder<List<String>>(
          stream: widget.bloc.path,
          builder: (final context, final pathSnapshot) => StreamBuilder<List<FilesTask>>(
            stream: widget.filesBloc.tasks,
            builder: (final context, final tasksSnapshot) {
              if (!pathSnapshot.hasData || !tasksSnapshot.hasData) {
                return const SizedBox();
              }
              return ValueListenableBuilder(
                valueListenable: widget.bloc.options.showHiddenFilesOption,
                builder: (final context, final showHiddenFiles, final _) {
                  final files = filesSnapshot.data?.where((final file) {
                    var hideFile = false;
                    if (widget.mode == FilesBrowserMode.selectDirectory && !file.isDirectory) {
                      hideFile = true;
                    }
                    if (!showHiddenFiles && file.isHidden) {
                      hideFile = true;
                    }

                    return !hideFile;
                  }).toList();

                  return BackButtonListener(
                    onBackButtonPressed: () async {
                      final path = pathSnapshot.requireData;
                      if (path.isNotEmpty) {
                        widget.bloc.setPath(path.sublist(0, path.length - 1));
                        return true;
                      }
                      return false;
                    },
                    child: SortBoxBuilder<FilesSortProperty, WebDavFile>(
                      sortBox: filesSortBox,
                      sortProperty: widget.bloc.options.filesSortPropertyOption,
                      sortBoxOrder: widget.bloc.options.filesSortBoxOrderOption,
                      presort: const {
                        (property: FilesSortProperty.isFolder, order: SortBoxOrder.ascending),
                      },
                      input: files,
                      builder: (final context, final sorted) {
                        final uploadingTaskTiles = buildUploadTasks(tasksSnapshot.requireData, sorted);

                        return NeonListView(
                          scrollKey: 'files-${pathSnapshot.requireData.join('/')}',
                          itemCount: sorted.length,
                          itemBuilder: (final context, final index) {
                            final file = sorted[index];
                            final matchingTask = tasksSnapshot.requireData
                                .firstWhereOrNull((final task) => _pathMatchesFile(task.path, file.name));

                            final details = matchingTask != null
                                ? FileDetails.fromTask(
                                    task: matchingTask,
                                    file: file,
                                  )
                                : FileDetails.fromWebDav(
                                    file: file,
                                    path: widget.bloc.path.value,
                                  );

                            return FileListTile(
                              bloc: widget.filesBloc,
                              browserBloc: widget.bloc,
                              details: details,
                              mode: widget.mode,
                            );
                          },
                          isLoading: filesSnapshot.isLoading,
                          error: filesSnapshot.error,
                          onRefresh: widget.bloc.refresh,
                          topScrollingChildren: [
                            FilesBrowserNavigator(
                              path: pathSnapshot.requireData,
                              bloc: widget.bloc,
                            ),
                            ...uploadingTaskTiles,
                          ],
                        );
                      },
                    ),
                  );
                },
              );
            },
          ),
        ),
      );

  Iterable<Widget> buildUploadTasks(final List<FilesTask> tasks, final List<WebDavFile> files) sync* {
    for (final task in tasks) {
      if (task is! FilesUploadTask) {
        continue;
      }

      yield FileListTile(
        bloc: widget.filesBloc,
        browserBloc: widget.bloc,
        details: FileDetails.fromUploadTask(
          task: task,
        ),
      );
    }
  }

  bool _pathMatchesFile(final List<String> path, final String name) => const ListEquality<String>().equals(
        [...widget.bloc.path.value, name],
        path,
      );
}