relatica/lib/screens/explore_screen.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:logging/logging.dart';

import '../controls/app_bottom_nav_bar.dart';
import '../controls/async_value_widget.dart';
import '../controls/connection_list_widget.dart';
import '../controls/current_profile_button.dart';
import '../controls/error_message_widget.dart';
import '../controls/padding.dart';
import '../controls/responsive_max_width.dart';
import '../controls/search_panel.dart';
import '../controls/search_result_status_control.dart';
import '../controls/standard_app_drawer.dart';
import '../controls/timeline/link_preview_control.dart';
import '../models/auth/profile.dart';
import '../models/networking/paging_data.dart';
import '../models/timeline_entry.dart';
import '../riverpod_controllers/account_services.dart';
import '../riverpod_controllers/connection_manager_services.dart';
import '../riverpod_controllers/entry_tree_item_services.dart';
import '../riverpod_controllers/hashtag_service.dart';
import '../riverpod_controllers/networking/friendica_trending_client_services.dart';
import '../routes.dart';
import '../utils/snackbar_builder.dart';

class ExploreScreen extends ConsumerWidget {
  const ExploreScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return DefaultTabController(
      length: 4,
      child: Scaffold(
        drawer: const StandardAppDrawer(skipPopDismiss: false),
        appBar: AppBar(
          leading: const CurrentProfileButton(),
          title: const TabBar(
            tabs: [
              Tab(icon: Icon(Icons.search)),
              Tab(icon: Icon(Icons.bolt)),
              Tab(icon: Icon(Icons.tag)),
              Tab(icon: Icon(Icons.recommend))
            ],
          ),
        ),
        body: SafeArea(
          child: TabBarView(children: [
            const SearchPanel(),
            _TrendsPanel(),
            const _FollowedTagsPanel(),
            const _SuggestedConnectionsWidget(),
          ]),
        ),
        bottomNavigationBar: const AppBottomNavBar(
          currentButton: NavBarButtons.explore,
        ),
      ),
    );
  }
}

enum TrendsType {
  globalTags('Global Tags'),
  localTags('Local Tags'),
  statuses('Statuses'),
  links('Links'),
  ;

  final String name;

  const TrendsType(this.name);
}

class _TrendsPanel extends ConsumerStatefulWidget {
  @override
  ConsumerState<_TrendsPanel> createState() => _TrendsPanelState();
}

class _TrendsPanelState extends ConsumerState<_TrendsPanel> {
  var type = TrendsType.globalTags;

  @override
  Widget build(BuildContext context) {
    ref.watch(activeProfileProvider);
    final trendingResults = switch (type) {
      TrendsType.globalTags => const _TrendingTagsWidget(
          local: false,
          sortByUses: true,
        ),
      TrendsType.localTags => const _TrendingTagsWidget(
          local: true,
          sortByUses: true,
        ),
      TrendsType.statuses => const _TrendingStatusesWidget(),
      TrendsType.links => const _TrendingLinksWidget(),
    };

    return SafeArea(
        child: Stack(
      children: [
        Column(
          children: [
            Text(
              'Trending ${type.name}',
              style: Theme.of(context).textTheme.headlineSmall,
            ),
            Expanded(
              child: ResponsiveMaxWidth(child: trendingResults),
            ),
          ],
        ),
        Positioned(
          right: 5,
          child: PopupMenuButton<TrendsType>(
            onSelected: (newType) => setState(() {
              type = newType;
            }),
            itemBuilder: (context) => TrendsType.values
                .map((t) => PopupMenuItem(
                      value: t,
                      child: Text(t.name),
                    ))
                .toList(),
          ),
        )
      ],
    ));
  }
}

class _TrendingTagsWidget extends ConsumerWidget {
  static final _logger = Logger('TrendingTagsWidget');
  final bool local;
  final bool sortByUses;

  const _TrendingTagsWidget({
    required this.local,
    required this.sortByUses,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    _logger.fine('Build');
    final profile = ref.watch(activeProfileProvider);
    return AsyncValueWidget(
      ref.watch(trendingHashtagsProvider(
        profile,
        page: const PagingData(limit: 100),
        local: local,
      )),
      valueBuilder: (vbContext, vbRef, result) => result.fold(
        onSuccess: (tags) {
          if (sortByUses) {
            tags.sort((t1, t2) => -t1.history.uses.compareTo(t2.history.uses));
          }
          return ListView.builder(
              itemCount: tags.length,
              itemBuilder: (_, index) {
                final tag = tags[index];
                return ListTile(
                  title: Text(tag.name),
                  subtitle: Text(
                      '${tag.history.accounts} people have mentioned this tag ${tag.history.uses} times'),
                  onTap: () {
                    vbContext.push('${ScreenPaths.tagView}/${tag.name}');
                  },
                );
              });
        },
        onError: (error) => Center(
          child: Column(
            children: [ErrorMessageWidget(message: error.message)],
          ),
        ),
      ),
    );
  }
}

class _TrendingLinksWidget extends ConsumerWidget {
  static final _logger = Logger('TrendingLinksWidget');

  const _TrendingLinksWidget();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    _logger.fine('Build');
    final profile = ref.watch(activeProfileProvider);
    return AsyncValueWidget(
      ref.watch(trendingLinksProvider(
        profile,
        page: const PagingData(limit: 100),
      )),
      valueBuilder: (vbContext, vbRef, result) => result.fold(
        onSuccess: (previews) {
          return ListView.separated(
              padding: const EdgeInsets.all(10.0),
              itemCount: previews.length,
              itemBuilder: (_, index) {
                return LinkPreviewControl(preview: previews[index]);
              },
              separatorBuilder: (BuildContext context, int index) =>
                  const VerticalPadding());
        },
        onError: (error) => Center(
          child: Column(
            children: [ErrorMessageWidget(message: error.message)],
          ),
        ),
      ),
    );
  }
}

class _TrendingStatusesWidget extends ConsumerWidget {
  static final _logger = Logger('TrendingLinksWidget');

  const _TrendingStatusesWidget();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    _logger.fine('Build');
    final profile = ref.watch(activeProfileProvider);
    return AsyncValueWidget(
      ref.watch(trendingStatusesProvider(
        profile,
        page: const PagingData(limit: 50),
      )),
      valueBuilder: (vbContext, vbRef, result) => result.fold(
        onSuccess: (statuses) {
          return ListView.separated(
            itemCount: statuses.length,
            itemBuilder: (_, index) {
              return buildStatusListTile(
                context,
                ref,
                profile,
                statuses[index],
              );
            },
            separatorBuilder: (BuildContext context, int index) =>
                const Divider(),
          );
        },
        onError: (error) => Center(
          child: Column(
            children: [ErrorMessageWidget(message: error.message)],
          ),
        ),
      ),
    );
  }

  Widget buildStatusListTile(BuildContext context, WidgetRef ref,
      Profile profile, TimelineEntry status) {
    return SearchResultStatusControl(status, () async {
      final result = await ref
          .read(timelineUpdaterProvider(profile).notifier)
          .refreshStatusChain(status.id);
      if (context.mounted) {
        result.match(
            onSuccess: (entry) =>
                context.push('/post/view/${entry.id}/${status.id}'),
            onError: (error) =>
                buildSnackbar(context, 'Error getting post: $error'));
      }
    });
  }
}

class _FollowedTagsPanel extends ConsumerWidget {
  const _FollowedTagsPanel();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final profile = ref.watch(activeProfileProvider);
    return SafeArea(
        child: Column(children: [
      Text(
        'Followed Tags',
        style: Theme.of(context).textTheme.headlineSmall,
      ),
      Expanded(
        child: ResponsiveMaxWidth(
            child: AsyncValueWidget(
          ref.watch(followedTagsMapProvider(profile)),
          valueBuilder: (vbContext, vbRef, result) => result.fold(
            onSuccess: (followedTags) {
              final tags = followedTags.keys.toList();
              return ListView.builder(
                  itemCount: tags.length,
                  itemBuilder: (_, index) {
                    final tag = tags[index];
                    return ListTile(
                      title: Text('#$tag'),
                      onTap: () {
                        vbContext.push('${ScreenPaths.tagView}/$tag');
                      },
                    );
                  });
            },
            onError: (error) => Center(
              child: Column(
                children: [ErrorMessageWidget(message: error.message)],
              ),
            ),
          ),
        )),
      ),
    ]));
  }
}

class _SuggestedConnectionsWidget extends ConsumerWidget {
  static final _logger = Logger('SuggestedFollowersWidget');

  const _SuggestedConnectionsWidget();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    _logger.fine('Build');
    final profile = ref.watch(activeProfileProvider);
    return AsyncValueWidget(
      ref.watch(suggestedConnectionsProvider(profile)),
      valueBuilder: (vbContext, vbRef, result) => result.fold(
        onSuccess: (connections) {
          return ListView.builder(
              itemCount: connections.length,
              itemBuilder: (_, index) {
                return ConnectionListWidget(contactId: connections[index].id);
              });
        },
        onError: (error) => Center(
          child: Column(
            children: [ErrorMessageWidget(message: error.message)],
          ),
        ),
      ),
    );
  }
}