386 lines
13 KiB
Dart
386 lines
13 KiB
Dart
import 'dart:async';
|
|
|
|
import 'package:flutter_riverpod/flutter_riverpod.dart';
|
|
|
|
import '../../../app/app.dart';
|
|
import '../../../backend/backend.dart';
|
|
import '../../../core/utils/result.dart';
|
|
import 'feed_state.dart';
|
|
|
|
final feedControllerProvider =
|
|
AsyncNotifierProvider<FeedController, FeedState>(FeedController.new);
|
|
|
|
class FeedController extends AsyncNotifier<FeedState> {
|
|
Timer? _providerDebounce;
|
|
Timer? _suggestionDebounce;
|
|
StreamSubscription<ProviderSoftRetryResult>? _softRetrySubscription;
|
|
int _loadRequestId = 0;
|
|
int _suggestionRequestId = 0;
|
|
|
|
@override
|
|
Future<FeedState> build() async {
|
|
ref.onDispose(() {
|
|
_providerDebounce?.cancel();
|
|
_suggestionDebounce?.cancel();
|
|
_softRetrySubscription?.cancel();
|
|
});
|
|
_softRetrySubscription ??= ref
|
|
.read(providerManagerProvider)
|
|
.softRetryResults
|
|
.listen(_applySoftRetryResult);
|
|
final providers = await _loadProviders();
|
|
final settings = await _settings();
|
|
final providerIds = providers.map((provider) => provider.id).toSet();
|
|
final initial = FeedState(
|
|
providers: providers,
|
|
topPeriodFilter: TopPeriodFilter.values.firstWhere(
|
|
(value) => value.name == settings.lastFeedTopPeriod,
|
|
orElse: () => TopPeriodFilter.none,
|
|
),
|
|
selectedTags: settings.lastFeedTags,
|
|
selectedProviderIds:
|
|
settings.lastFeedProviderIds.where(providerIds.contains).toList(),
|
|
ratingFilter: settings.lastFeedRating ?? settings.defaultRatingFilter,
|
|
);
|
|
state = AsyncData(initial);
|
|
await loadInitial();
|
|
return state.value ?? initial;
|
|
}
|
|
|
|
Future<void> loadInitial() async {
|
|
final current = state.value ?? const FeedState();
|
|
final requestId = ++_loadRequestId;
|
|
state = const AsyncLoading();
|
|
final posts = await _load(refresh: true, current: current);
|
|
if (requestId != _loadRequestId) return;
|
|
state = AsyncData(current.copyWith(
|
|
posts: posts,
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
clearError: true,
|
|
providerStatusMessage: await _providerStatusMessage(current),
|
|
));
|
|
}
|
|
|
|
Future<void> refresh() async {
|
|
final current = state.value ?? const FeedState();
|
|
final requestId = ++_loadRequestId;
|
|
state = AsyncData(current.copyWith(isLoadingMore: true, clearError: true));
|
|
final posts = await _load(refresh: true, current: current);
|
|
if (requestId != _loadRequestId) return;
|
|
state = AsyncData(current.copyWith(
|
|
posts: posts,
|
|
isLoadingMore: false,
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
providerStatusMessage: await _providerStatusMessage(current),
|
|
));
|
|
}
|
|
|
|
Future<void> loadNextPage() async {
|
|
final current = state.value;
|
|
if (current == null || current.isLoadingMore || !current.hasMore) return;
|
|
final requestId = ++_loadRequestId;
|
|
state = AsyncData(current.copyWith(isLoadingMore: true, clearError: true));
|
|
final posts = <Post>[];
|
|
const maxEmptyPageSkips = 3;
|
|
var attempts = 0;
|
|
while (posts.isEmpty && attempts < maxEmptyPageSkips) {
|
|
attempts++;
|
|
posts.addAll(await _load(refresh: false, current: current));
|
|
if (requestId != _loadRequestId) return;
|
|
}
|
|
if (requestId != _loadRequestId) return;
|
|
final existingKeys = current.posts.map((post) => post.cacheKey).toSet();
|
|
final newPosts = posts
|
|
.where((post) => existingKeys.add(post.cacheKey))
|
|
.toList(growable: false);
|
|
final emptyPageStreak =
|
|
newPosts.isEmpty ? current.emptyPageStreak + attempts : 0;
|
|
state = AsyncData(
|
|
current.copyWith(
|
|
posts: [...current.posts, ...newPosts],
|
|
isLoadingMore: false,
|
|
hasMore: newPosts.isNotEmpty || emptyPageStreak < maxEmptyPageSkips,
|
|
emptyPageStreak: emptyPageStreak,
|
|
),
|
|
);
|
|
}
|
|
|
|
Future<void> search(String query) async {
|
|
final tags = ref.read(searchServiceProvider).parseTags(query);
|
|
final current = state.value ?? const FeedState();
|
|
state = AsyncData(
|
|
current.copyWith(
|
|
selectedTags: tags,
|
|
posts: [],
|
|
tagSuggestions: [],
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
),
|
|
);
|
|
await saveSession(scrollOffset: 0);
|
|
await ref.read(searchServiceProvider).saveSearch(query, 0);
|
|
await refresh();
|
|
final count = state.value?.posts.length ?? 0;
|
|
await ref.read(searchServiceProvider).saveSearch(query, count);
|
|
}
|
|
|
|
Future<void> updateTagSuggestions(String query) async {
|
|
final current = state.value ?? const FeedState();
|
|
final lastToken =
|
|
query.trim().isEmpty ? '' : query.trim().split(RegExp(r'\s+')).last;
|
|
final requestId = ++_suggestionRequestId;
|
|
_suggestionDebounce?.cancel();
|
|
if (lastToken.trim().isEmpty) {
|
|
state = AsyncData(current.copyWith(tagSuggestions: []));
|
|
return;
|
|
}
|
|
_suggestionDebounce = Timer(const Duration(milliseconds: 280), () async {
|
|
final result = await ref
|
|
.read(searchServiceProvider)
|
|
.autocompleteDetailed(lastToken, limit: 16);
|
|
if (requestId != _suggestionRequestId) return;
|
|
final normalizedToken = lastToken.trim().toLowerCase();
|
|
final suggestions = result is Success<List<TagSuggestion>>
|
|
? result.data
|
|
.where((item) => item.name.toLowerCase().startsWith(
|
|
normalizedToken,
|
|
))
|
|
.toList(growable: false)
|
|
: const <TagSuggestion>[];
|
|
final latest = state.value ?? current;
|
|
state = AsyncData(latest.copyWith(tagSuggestions: suggestions));
|
|
});
|
|
}
|
|
|
|
Future<void> setProviders(List<String> providerIds) async {
|
|
final current = state.value ?? const FeedState();
|
|
final enabledIds = current.providers.map((provider) => provider.id).toSet();
|
|
final selected = providerIds.where(enabledIds.contains).toList();
|
|
state = AsyncData(current.copyWith(
|
|
selectedProviderIds: selected,
|
|
posts: [],
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
));
|
|
final settings = await _settings();
|
|
await ref.read(settingsServiceProvider).updateSettings(
|
|
settings.copyWith(
|
|
selectedFeedProviderIds: selected,
|
|
lastFeedProviderIds: selected,
|
|
),
|
|
);
|
|
_providerDebounce?.cancel();
|
|
_providerDebounce = Timer(const Duration(milliseconds: 320), () {
|
|
refresh();
|
|
});
|
|
}
|
|
|
|
Future<void> setTopPeriod(TopPeriodFilter period) async {
|
|
final current = state.value ?? const FeedState();
|
|
state = AsyncData(current.copyWith(
|
|
topPeriodFilter: period,
|
|
posts: [],
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
));
|
|
final settings = await _settings();
|
|
await ref.read(settingsServiceProvider).updateSettings(
|
|
settings.copyWith(defaultTopPeriodFilter: period.name),
|
|
);
|
|
await saveSession(scrollOffset: 0);
|
|
await refresh();
|
|
}
|
|
|
|
Future<void> setRating(String? rating) async {
|
|
final current = state.value ?? const FeedState();
|
|
state = AsyncData(
|
|
current.copyWith(
|
|
ratingFilter: rating,
|
|
clearRating: rating == null,
|
|
posts: [],
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
),
|
|
);
|
|
await refresh();
|
|
await saveSession(scrollOffset: 0);
|
|
}
|
|
|
|
Future<void> clearFilters() async {
|
|
final current = state.value ?? const FeedState();
|
|
state = AsyncData(
|
|
current.copyWith(
|
|
selectedTags: [],
|
|
selectedProviderIds: [],
|
|
tagSuggestions: [],
|
|
clearRating: true,
|
|
posts: [],
|
|
hasMore: true,
|
|
emptyPageStreak: 0,
|
|
),
|
|
);
|
|
final settings = await _settings();
|
|
await ref.read(settingsServiceProvider).updateSettings(settings.copyWith(
|
|
selectedFeedProviderIds: [],
|
|
lastFeedTags: [],
|
|
lastFeedProviderIds: [],
|
|
clearLastFeedRating: true,
|
|
lastFeedTopPeriod: TopPeriodFilter.none.name,
|
|
lastFeedScrollOffset: 0,
|
|
));
|
|
await refresh();
|
|
}
|
|
|
|
Future<void> hidePost(Post post) async {
|
|
final current = state.value;
|
|
if (current == null) return;
|
|
final result =
|
|
await ref.read(settingsServiceProvider).hidePostKey(post.cacheKey);
|
|
if (result is Error<void>) return;
|
|
state = AsyncData(
|
|
current.copyWith(
|
|
posts: current.posts
|
|
.where((item) => item.cacheKey != post.cacheKey)
|
|
.toList(growable: false),
|
|
),
|
|
);
|
|
ref.invalidate(appSettingsProvider);
|
|
}
|
|
|
|
Future<void> saveSession({double? scrollOffset}) async {
|
|
final current = state.value;
|
|
if (current == null) return;
|
|
final settings = await _settings();
|
|
await ref.read(settingsServiceProvider).updateSettings(
|
|
settings.copyWith(
|
|
lastFeedTags: current.selectedTags,
|
|
lastFeedProviderIds: current.selectedProviderIds,
|
|
lastFeedRating: current.ratingFilter,
|
|
lastFeedTopPeriod: current.topPeriodFilter.name,
|
|
lastFeedScrollOffset: scrollOffset ?? settings.lastFeedScrollOffset,
|
|
),
|
|
);
|
|
}
|
|
|
|
Future<List<Post>> _load({
|
|
required bool refresh,
|
|
required FeedState current,
|
|
}) async {
|
|
final service = ref.read(feedServiceProvider);
|
|
final providerIds = current.selectedProviderIds.isEmpty
|
|
? <String?>[null]
|
|
: current.selectedProviderIds;
|
|
final posts = <Post>[];
|
|
final providerResults = <List<Post>>[];
|
|
for (final providerId in providerIds) {
|
|
final result = refresh
|
|
? await service.refresh(
|
|
tags: current.selectedTags,
|
|
rating: current.ratingFilter,
|
|
providerId: providerId,
|
|
topPeriod: current.topPeriodFilter,
|
|
)
|
|
: await service.loadNextPage(
|
|
tags: current.selectedTags,
|
|
rating: current.ratingFilter,
|
|
providerId: providerId,
|
|
topPeriod: current.topPeriodFilter,
|
|
);
|
|
if (result is Success<List<Post>>) {
|
|
providerResults.add(result.data);
|
|
}
|
|
}
|
|
final seen = <String>{};
|
|
if (providerResults.length <= 1) {
|
|
for (final group in providerResults) {
|
|
for (final post in group) {
|
|
if (seen.add(post.cacheKey)) posts.add(post);
|
|
}
|
|
}
|
|
return posts;
|
|
}
|
|
for (final group in providerResults) {
|
|
for (final post in group) {
|
|
if (seen.add(post.cacheKey)) posts.add(post);
|
|
}
|
|
}
|
|
posts.sort((a, b) => _mixKey(a).compareTo(_mixKey(b)));
|
|
return posts;
|
|
}
|
|
|
|
void _applySoftRetryResult(ProviderSoftRetryResult result) {
|
|
final current = state.value;
|
|
if (current == null || result.page != 0) return;
|
|
if (!_sameTags(current.selectedTags, result.tags)) return;
|
|
if (current.ratingFilter != result.rating) return;
|
|
if (current.topPeriodFilter != result.topPeriod) return;
|
|
if (current.selectedProviderIds.isNotEmpty &&
|
|
!current.selectedProviderIds.contains(result.providerId)) {
|
|
return;
|
|
}
|
|
final seen = current.posts.map((post) => post.cacheKey).toSet();
|
|
final newPosts = result.posts
|
|
.where((post) => seen.add(post.cacheKey))
|
|
.toList(growable: false);
|
|
if (newPosts.isEmpty) return;
|
|
state = AsyncData(
|
|
current.copyWith(
|
|
posts: [...current.posts, ...newPosts]..sort(
|
|
(a, b) => _mixKey(a).compareTo(_mixKey(b)),
|
|
),
|
|
providerStatusMessage: 'Retry added ${newPosts.length} posts',
|
|
),
|
|
);
|
|
}
|
|
|
|
bool _sameTags(List<String> left, List<String> right) {
|
|
if (left.length != right.length) return false;
|
|
for (var i = 0; i < left.length; i++) {
|
|
if (left[i] != right[i]) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
Future<String?> _providerStatusMessage(FeedState current) async {
|
|
final result = await ref.read(providerRepositoryProvider).getDiagnostics();
|
|
if (result is! Success<List<ProviderDiagnostics>>) return null;
|
|
final selected = current.selectedProviderIds.isEmpty
|
|
? current.providers.map((provider) => provider.id).toSet()
|
|
: current.selectedProviderIds.toSet();
|
|
final failed = result.data
|
|
.where((item) =>
|
|
selected.contains(item.providerId) &&
|
|
item.lastErrorMessage != null &&
|
|
item.lastErrorMessage!.isNotEmpty)
|
|
.map((item) => item.providerId)
|
|
.toSet();
|
|
if (failed.isEmpty) return null;
|
|
return 'Retrying ${failed.length} provider${failed.length == 1 ? '' : 's'}';
|
|
}
|
|
|
|
int _mixKey(Post post) {
|
|
var hash = 0x811c9dc5;
|
|
for (final code in post.cacheKey.codeUnits) {
|
|
hash ^= code;
|
|
hash = (hash * 0x01000193) & 0x7fffffff;
|
|
}
|
|
return hash;
|
|
}
|
|
|
|
Future<List<ContentProviderConfig>> _loadProviders() async {
|
|
final result = await ref
|
|
.read(providerManagerProvider)
|
|
.loadFeedConfigs(enabledOnly: true);
|
|
return result is Success<List<ContentProviderConfig>>
|
|
? result.data
|
|
: const [];
|
|
}
|
|
|
|
Future<AppSettings> _settings() async {
|
|
final result = await ref.read(settingsServiceProvider).getSettings();
|
|
return result is Success<AppSettings> ? result.data : AppSettings.defaults;
|
|
}
|
|
}
|