import 'dart:io';

import 'package:aves/model/filters/album.dart';
import 'package:aves/model/filters/filters.dart';
import 'package:aves/model/filters/path.dart';
import 'package:aves/model/settings/enums/accessibility_animations.dart';
import 'package:aves/model/settings/settings.dart';
import 'package:aves/model/source/collection_source.dart';
import 'package:aves/services/common/services.dart';
import 'package:aves/theme/durations.dart';
import 'package:aves/theme/icons.dart';
import 'package:aves/theme/themes.dart';
import 'package:aves/utils/android_file_utils.dart';
import 'package:aves/view/view.dart';
import 'package:aves/widgets/collection/collection_page.dart';
import 'package:aves/widgets/common/app_bar/app_bar_title.dart';
import 'package:aves/widgets/common/basic/font_size_icon_theme.dart';
import 'package:aves/widgets/common/basic/popup/menu_row.dart';
import 'package:aves/widgets/common/basic/scaffold.dart';
import 'package:aves/widgets/common/extensions/build_context.dart';
import 'package:aves/widgets/common/identity/aves_filter_chip.dart';
import 'package:aves/widgets/common/identity/empty.dart';
import 'package:aves/widgets/common/search/route.dart';
import 'package:aves/widgets/navigation/drawer/app_drawer.dart';
import 'package:aves/widgets/search/search_delegate.dart';
import 'package:aves/widgets/settings/privacy/file_picker/crumb_line.dart';
import 'package:aves_model/aves_model.dart';
import 'package:collection/collection.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:provider/provider.dart';

class ExplorerPage extends StatefulWidget {
  static const routeName = '/explorer';

  const ExplorerPage({super.key});

  @override
  State<ExplorerPage> createState() => _ExplorerPageState();
}

class _ExplorerPageState extends State<ExplorerPage> {
  late VolumeRelativeDirectory _directory;
  List<Directory>? _contents;

  Set<StorageVolume> get volumes => androidFileUtils.storageVolumes;

  String get currentDirectoryPath => pContext.join(_directory.volumePath, _directory.relativeDir);

  @override
  void initState() {
    super.initState();
    final primaryVolume = volumes.firstWhereOrNull((v) => v.isPrimary);
    if (primaryVolume != null) {
      _goTo(primaryVolume.path);
    }
  }

  @override
  Widget build(BuildContext context) {
    final l10n = context.l10n;
    final visibleContents = _contents?.where((v) {
      final isHidden = pContext.split(v.path).last.startsWith('.');
      return !isHidden;
    }).toList();
    return PopScope(
      canPop: _directory.relativeDir.isEmpty,
      onPopInvoked: (didPop) {
        if (didPop) return;

        final parent = pContext.dirname(currentDirectoryPath);
        _goTo(parent);
        setState(() {});
      },
      child: AvesScaffold(
        appBar: _buildAppBar(context),
        drawer: const AppDrawer(),
        body: SafeArea(
          child: Column(
            children: [
              SizedBox(
                height: kMinInteractiveDimension,
                child: CrumbLine(
                  directory: _directory,
                  onTap: (path) {
                    _goTo(path);
                    setState(() {});
                  },
                ),
              ),
              const Divider(height: 0),
              Expanded(
                child: visibleContents == null
                    ? const SizedBox()
                    : visibleContents.isEmpty
                        ? Center(
                            child: EmptyContent(
                              icon: AIcons.folder,
                              text: l10n.filePickerNoItems,
                            ),
                          )
                        : ListView.builder(
                            itemCount: visibleContents.length,
                            itemBuilder: (context, index) {
                              return index < visibleContents.length ? _buildContentLine(context, visibleContents[index]) : const SizedBox();
                            },
                          ),
              ),
              const Divider(height: 0),
              Padding(
                padding: const EdgeInsets.all(8),
                child: AvesFilterChip(
                  filter: PathFilter(currentDirectoryPath),
                  maxWidth: double.infinity,
                  onTap: (filter) => _goToCollectionPage(context, filter),
                  onLongPress: null,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  AppBar _buildAppBar(BuildContext context) {
    final animations = context.select<Settings, AccessibilityAnimations>((s) => s.accessibilityAnimations);

    return AppBar(
      title: InteractiveAppBarTitle(
        onTap: _goToSearch,
        child: Text(
          context.l10n.explorerPageTitle,
          softWrap: false,
          overflow: TextOverflow.fade,
          maxLines: 1,
        ),
      ),
      actions: [
        if (volumes.length > 1)
          FontSizeIconTheme(
            child: PopupMenuButton<StorageVolume>(
              itemBuilder: (context) {
                return volumes.map((v) {
                  final selected = _directory.volumePath == v.path;
                  final icon = v.isRemovable ? AIcons.storageCard : AIcons.storageMain;
                  return PopupMenuItem(
                    value: v,
                    enabled: !selected,
                    child: MenuRow(
                      text: v.getDescription(context),
                      icon: Icon(icon),
                    ),
                  );
                }).toList();
              },
              onSelected: (volume) async {
                // wait for the popup menu to hide before proceeding with the action
                await Future.delayed(animations.popUpAnimationDelay * timeDilation);

                Navigator.maybeOf(context)?.pop();
                await Future.delayed(ADurations.drawerTransitionAnimation);
                _goTo(volume.path);
                setState(() {});
              },
              popUpAnimationStyle: animations.popUpAnimationStyle,
            ),
          ),
      ],
    );
  }

  String? _getAlbumPath(CollectionSource source, FileSystemEntity content) {
    final contentPath = content.path.toLowerCase();
    return source.rawAlbums.firstWhereOrNull((v) => v.toLowerCase() == contentPath);
  }

  Widget _buildContentLine(BuildContext context, FileSystemEntity content) {
    final source = context.read<CollectionSource>();
    final album = _getAlbumPath(source, content);
    final baseIconTheme = IconTheme.of(context);

    return ListTile(
      leading: const Icon(AIcons.folder),
      title: Text('${Unicode.FSI}${pContext.split(content.path).last}${Unicode.PDI}'),
      trailing: album != null
          ? IconTheme.merge(
              data: baseIconTheme,
              child: AvesFilterChip(
                filter: AlbumFilter(album, source.getAlbumDisplayName(context, album)),
                showText: false,
                maxWidth: AvesFilterChip.minChipWidth,
                onTap: (filter) => _goToCollectionPage(context, filter),
                onLongPress: null,
              ),
            )
          : null,
      onTap: () {
        _goTo(content.path);
        setState(() {});
      },
    );
  }

  void _goTo(String path) {
    _directory = androidFileUtils.relativeDirectoryFromPath(path)!;
    _contents = null;
    final contents = <Directory>[];

    final source = context.read<CollectionSource>();
    final albums = source.rawAlbums.map((v) => v.toLowerCase()).toSet();
    Directory(currentDirectoryPath).list().listen((event) {
      final entity = event.absolute;
      if (entity is Directory) {
        final dirPath = entity.path.toLowerCase();
        if (albums.any((v) => v.startsWith(dirPath))) {
          contents.add(entity);
        }
      }
    }, onDone: () {
      _contents = contents..sort((a, b) => compareAsciiUpperCaseNatural(pContext.split(a.path).last, pContext.split(b.path).last));
      setState(() {});
    });
  }

  void _goToSearch() {
    Navigator.maybeOf(context)?.push(
      SearchPageRoute(
        delegate: CollectionSearchDelegate(
          searchFieldLabel: context.l10n.searchCollectionFieldHint,
          searchFieldStyle: Themes.searchFieldStyle(context),
          source: context.read<CollectionSource>(),
        ),
      ),
    );
  }

  void _goToCollectionPage(BuildContext context, CollectionFilter filter) {
    Navigator.maybeOf(context)?.push(
      MaterialPageRoute(
        settings: const RouteSettings(name: CollectionPage.routeName),
        builder: (context) => CollectionPage(
          source: context.read<CollectionSource>(),
          filters: {filter},
        ),
      ),
    );
  }
}