import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:loader_overlay/loader_overlay.dart';
import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';

import '../../../api/marianumcloud/webdav/queries/listFiles/cacheableFile.dart';
import '../../../state/app/infrastructure/loadableState/loadable_state.dart';
import '../../../state/app/infrastructure/loadableState/view/loadable_state_consumer.dart';
import '../../../state/app/infrastructure/utilityWidgets/bloc_module.dart';
import '../../../state/app/modules/files/bloc/files_bloc.dart';
import '../../../state/app/modules/files/bloc/files_state.dart';
import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
import '../../../widget/filePick.dart';
import '../../../widget/placeholderView.dart';
import 'fileElement.dart';
import 'filesUploadDialog.dart';

class BetterSortOption {
  String displayName;
  int Function(CacheableFile, CacheableFile) compare;
  IconData icon;

  BetterSortOption({required this.displayName, required this.icon, required this.compare});
}

enum SortOption { name, date, size }

class SortOptions {
  static Map<SortOption, BetterSortOption> options = {
    SortOption.name: BetterSortOption(
      displayName: 'Name',
      icon: Icons.sort_by_alpha_outlined,
      compare: (a, b) => a.name.compareTo(b.name),
    ),
    SortOption.date: BetterSortOption(
      displayName: 'Datum',
      icon: Icons.history_outlined,
      compare: (a, b) => a.modifiedAt!.compareTo(b.modifiedAt!),
    ),
    SortOption.size: BetterSortOption(
      displayName: 'Größe',
      icon: Icons.sd_card_outlined,
      compare: (a, b) {
        if (a.isDirectory || b.isDirectory) return a.isDirectory ? 1 : 0;
        if (a.size == null) return 0;
        if (b.size == null) return 1;
        return a.size!.compareTo(b.size!);
      },
    ),
  };

  static BetterSortOption getOption(SortOption option) => options[option]!;
}

class Files extends StatelessWidget {
  final List<String> path;

  Files({List<String>? path, super.key}) : path = path ?? [];

  @override
  Widget build(BuildContext context) => BlocModule<FilesBloc, LoadableState<FilesState>>(
        create: (_) => FilesBloc(initialPath: path),
        child: (context, _, _) => _FilesView(path: path),
      );
}

class _FilesView extends StatefulWidget {
  final List<String> path;
  const _FilesView({required this.path});

  @override
  State<_FilesView> createState() => _FilesViewState();
}

class _FilesViewState extends State<_FilesView> {
  late final SettingsCubit settings;
  late SortOption currentSort;
  late bool currentSortDirection;

  @override
  void initState() {
    super.initState();
    settings = context.read<SettingsCubit>();
    currentSort = settings.val().fileSettings.sortBy;
    currentSortDirection = settings.val().fileSettings.ascending;
  }

  Future<void> mediaUpload(List<String>? paths) async {
    if (paths == null) return;
    final bloc = context.read<FilesBloc>();
    pushScreen(
      context,
      withNavBar: false,
      screen: FilesUploadDialog(
        filePaths: paths,
        remotePath: widget.path.join('/'),
        onUploadFinished: (_) => bloc.refresh(),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final bloc = context.read<FilesBloc>();
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.path.isNotEmpty ? widget.path.last : 'Dateien'),
        actions: [
          PopupMenuButton<bool>(
            icon: Icon(currentSortDirection ? Icons.text_rotate_up : Icons.text_rotation_down),
            itemBuilder: (context) => [true, false]
                .map((e) => PopupMenuItem<bool>(
                      value: e,
                      enabled: e != currentSortDirection,
                      child: Row(
                        children: [
                          Icon(
                            e ? Icons.text_rotate_up : Icons.text_rotation_down,
                            color: Theme.of(context).colorScheme.onSurface,
                          ),
                          const SizedBox(width: 15),
                          Text(e ? 'Aufsteigend' : 'Absteigend'),
                        ],
                      ),
                    ))
                .toList(),
            onSelected: (e) {
              setState(() {
                currentSortDirection = e;
                settings.val(write: true).fileSettings.ascending = e;
              });
            },
          ),
          PopupMenuButton<SortOption>(
            icon: const Icon(Icons.sort),
            itemBuilder: (context) => SortOptions.options.keys
                .map((key) => PopupMenuItem<SortOption>(
                      value: key,
                      enabled: key != currentSort,
                      child: Row(
                        children: [
                          Icon(SortOptions.getOption(key).icon, color: Theme.of(context).colorScheme.onSurface),
                          const SizedBox(width: 15),
                          Text(SortOptions.getOption(key).displayName),
                        ],
                      ),
                    ))
                .toList(),
            onSelected: (e) {
              setState(() {
                currentSort = e;
                settings.val(write: true).fileSettings.sortBy = e;
              });
            },
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        heroTag: 'uploadFile',
        backgroundColor: Theme.of(context).primaryColor,
        onPressed: () => _showAddDialog(context, bloc),
        child: const Icon(Icons.add),
      ),
      body: LoadableStateConsumer<FilesBloc, FilesState>(
        child: (state, _) {
          final listing = state.listing;
          if (listing == null) return const SizedBox.shrink();
          if (listing.files.isEmpty) {
            return const PlaceholderView(icon: Icons.folder_off_rounded, text: 'Der Ordner ist leer');
          }
          final files = listing.sortBy(
            sortOption: currentSort,
            foldersToTop: context.watch<SettingsCubit>().val().fileSettings.sortFoldersToTop,
            reversed: currentSortDirection,
          );
          return LoaderOverlay(
            child: ListView.builder(
              padding: EdgeInsets.zero,
              itemCount: files.length,
              itemBuilder: (context, index) => FileElement(files[index], widget.path, bloc.refresh),
            ),
          );
        },
      ),
    );
  }

  void _showAddDialog(BuildContext context, FilesBloc bloc) {
    showDialog(
      context: context,
      builder: (dialogCtx) => SimpleDialog(children: [
        ListTile(
          leading: const Icon(Icons.create_new_folder_outlined),
          title: const Text('Ordner erstellen'),
          onTap: () {
            Navigator.of(dialogCtx).pop();
            _showCreateFolderDialog(context, bloc);
          },
        ),
        ListTile(
          leading: const Icon(Icons.upload_file),
          title: const Text('Aus Dateien hochladen'),
          onTap: () {
            FilePick.documentPick().then(mediaUpload);
            Navigator.of(dialogCtx).pop();
          },
        ),
        Visibility(
          visible: !Platform.isIOS,
          child: ListTile(
            leading: const Icon(Icons.add_a_photo_outlined),
            title: const Text('Aus Gallerie hochladen'),
            onTap: () {
              FilePick.multipleGalleryPick().then((value) {
                if (value != null) mediaUpload(value.map((e) => e.path).toList());
              });
              Navigator.of(dialogCtx).pop();
            },
          ),
        ),
      ]),
    );
  }

  void _showCreateFolderDialog(BuildContext context, FilesBloc bloc) {
    final inputController = TextEditingController();
    showDialog(
      context: context,
      builder: (dialogCtx) => AlertDialog(
        title: const Text('Neuer Ordner'),
        content: TextField(
          controller: inputController,
          decoration: const InputDecoration(labelText: 'Name'),
        ),
        actions: [
          TextButton(onPressed: () => Navigator.of(dialogCtx).pop(), child: const Text('Abbrechen')),
          TextButton(
            onPressed: () {
              bloc.createFolder(inputController.text);
              Navigator.of(dialogCtx).pop();
            },
            child: const Text('Ordner erstellen'),
          ),
        ],
      ),
    );
  }
}