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admin1
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import 'dart:async';
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import 'package:flutter/foundation.dart';
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import '../../../core/contracts/library.dart';
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import '../../../shared/utils/app_logger.dart';
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import '../../../shared/utils/format_utils.dart';
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import 'playlist.dart';
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typedef LoadEpisodesFn =
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Future<List<EmbyRawItem>> Function({
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required String seriesId,
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required String seasonId,
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});
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typedef LoadSeasonsFn = Future<List<EmbyRawSeason>> Function(String seriesId);
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class SeriesEpisodePlaylist implements Playlist {
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SeriesEpisodePlaylist({
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required this.seriesId,
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required this.loadEpisodes,
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required this.loadSeasons,
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}) : _current = ValueNotifier<PlaylistItem>(_placeholder),
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_currentIndex = ValueNotifier<int>(-1);
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final String seriesId;
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final LoadEpisodesFn loadEpisodes;
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final LoadSeasonsFn loadSeasons;
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final ValueNotifier<PlaylistItem> _current;
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final ValueNotifier<int> _currentIndex;
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String? _currentSeasonId;
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List<EmbyRawItem> _episodes = const [];
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String? _initialMediaSourceId;
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int? _initialStartPositionTicks;
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int? _initialPreferredAudio;
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int? _initialPreferredSub;
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bool _initialPlayFromStart = false;
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bool _initialApplied = false;
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bool _disposed = false;
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bool _userNavigated = false;
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static const PlaylistItem _placeholder = PlaylistItem(itemId: '');
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Future<void> initialize({
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required String seasonId,
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required String episodeId,
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int? initialIndexNumber,
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String? initialMediaSourceId,
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int? initialStartPositionTicks,
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int? initialPreferredAudioStreamIndex,
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int? initialPreferredSubtitleStreamIndex,
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bool initialPlayFromStart = false,
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EmbyRawItem? preloadedItem,
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}) async {
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_initialMediaSourceId = initialMediaSourceId;
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_initialStartPositionTicks = initialStartPositionTicks;
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_initialPreferredAudio = initialPreferredAudioStreamIndex;
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_initialPreferredSub = initialPreferredSubtitleStreamIndex;
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_initialPlayFromStart = initialPlayFromStart;
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_initialApplied = true;
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_currentSeasonId = seasonId;
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_current.value = PlaylistItem(
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itemId: episodeId,
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mediaSourceId: initialMediaSourceId,
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startPositionTicks: initialStartPositionTicks,
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preferredAudioStreamIndex: initialPreferredAudioStreamIndex,
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preferredSubtitleStreamIndex: initialPreferredSubtitleStreamIndex,
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playFromStart: initialPlayFromStart,
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displayLabel: preloadedItem != null ? _labelOf(preloadedItem) : '',
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preloadedItem: preloadedItem,
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);
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unawaited(_resolveEpisodeList(seasonId, episodeId, initialIndexNumber));
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}
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Future<void> _resolveEpisodeList(
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String seasonId,
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String episodeId,
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int? initialIndexNumber,
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) async {
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try {
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await _loadSeasonEpisodes(seasonId);
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} catch (e) {
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AppLogger.warn(
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'SeriesEpisodePlaylist',
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'background episode list load failed',
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e,
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);
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return;
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}
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if (_disposed || _userNavigated) return;
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var idx = _episodes.indexWhere((e) => e.Id == episodeId);
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if (idx < 0 && initialIndexNumber != null) {
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idx = _episodes.indexWhere((e) => e.IndexNumber == initialIndexNumber);
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}
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AppLogger.debug(
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'SeriesEpisodePlaylist',
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'episodeListReady seriesId=$seriesId seasonId=$seasonId '
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'episodeId=$episodeId idx=$idx '
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'episodes=${_episodes.length} '
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'episodeIds=${_episodes.map((e) => e.Id).toList()}',
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);
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if (_episodes.isEmpty) return;
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_currentIndex.value = idx < 0 ? 0 : idx;
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}
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@override
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ValueListenable<PlaylistItem> get current => _current;
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@override
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ValueListenable<int> get currentIndex => _currentIndex;
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@override
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int get length => _episodes.length;
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@override
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bool get hasNext => _episodes.isNotEmpty;
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@override
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bool get hasPrev => _episodes.isNotEmpty;
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@override
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Future<void> next() async {
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if (_disposed || _episodes.isEmpty) return;
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final cur = _currentIndex.value;
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if (cur < _episodes.length - 1) {
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_markMoved();
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_setCurrent(cur + 1);
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return;
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}
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await _crossSeason(direction: 1);
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}
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@override
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Future<void> prev() async {
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if (_disposed || _episodes.isEmpty) return;
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final cur = _currentIndex.value;
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if (cur > 0) {
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_markMoved();
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_setCurrent(cur - 1);
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return;
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}
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await _crossSeason(direction: -1);
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}
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@override
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Future<void> goTo(int index) async {
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if (_disposed || index < 0 || index >= _episodes.length) return;
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if (index == _currentIndex.value) return;
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_markMoved();
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_setCurrent(index);
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}
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@override
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Future<void> goToItemId(String itemId) async {
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if (_disposed) return;
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final idx = _episodes.indexWhere((e) => e.Id == itemId);
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if (idx < 0) return;
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if (idx == _currentIndex.value) return;
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_markMoved();
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_setCurrent(idx);
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}
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Future<void> goToInSeason({
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required String seasonId,
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required String episodeId,
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}) async {
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if (_disposed) return;
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if (seasonId != _currentSeasonId || _episodes.isEmpty) {
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await _loadSeasonEpisodes(seasonId);
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if (_disposed) return;
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}
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final idx = _episodes.indexWhere((e) => e.Id == episodeId);
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if (idx < 0) return;
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if (_currentSeasonId == seasonId && idx == _currentIndex.value) return;
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_markMoved();
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_setCurrent(idx);
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}
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Future<void> _crossSeason({required int direction}) async {
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final curSeason = _currentSeasonId;
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if (curSeason == null) return;
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final seasons = await loadSeasons(seriesId);
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if (_disposed) return;
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final ordered = [...seasons]
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..sort((a, b) => (a.IndexNumber ?? 0).compareTo(b.IndexNumber ?? 0));
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final curPos = ordered.indexWhere((s) => s.Id == curSeason);
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if (curPos < 0) return;
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final targetPos = curPos + direction;
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if (targetPos < 0 || targetPos >= ordered.length) return;
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final target = ordered[targetPos];
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await _loadSeasonEpisodes(target.Id);
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if (_disposed || _episodes.isEmpty) return;
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_markMoved();
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_setCurrent(direction > 0 ? 0 : _episodes.length - 1);
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}
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Future<void> _loadSeasonEpisodes(String seasonId) async {
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final eps = await loadEpisodes(seriesId: seriesId, seasonId: seasonId);
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if (_disposed) return;
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_currentSeasonId = seasonId;
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_episodes = List.unmodifiable(eps);
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}
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void _markMoved() {
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_initialApplied = true;
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_userNavigated = true;
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}
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void _setCurrent(int index) {
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_currentIndex.value = index;
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_current.value = _itemFromEpisode(_episodes[index]);
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}
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PlaylistItem _itemFromEpisode(EmbyRawItem ep) {
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final useInitial = !_initialApplied;
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_initialApplied = true;
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return PlaylistItem(
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itemId: ep.Id,
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mediaSourceId: useInitial ? _initialMediaSourceId : null,
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startPositionTicks: useInitial ? _initialStartPositionTicks : null,
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preferredAudioStreamIndex: useInitial ? _initialPreferredAudio : null,
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preferredSubtitleStreamIndex: useInitial ? _initialPreferredSub : null,
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displayLabel: _labelOf(ep),
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playFromStart: useInitial && _initialPlayFromStart,
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preloadedItem: ep,
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);
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}
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String _labelOf(EmbyRawItem ep) {
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final ep0 = ep.IndexNumber;
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final name = ep.Name;
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if (ep0 != null && name.isNotEmpty) {
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return '${formatEpisodeNumber(ep0)} $name';
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}
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if (name.isNotEmpty) return name;
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return ep.Id;
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}
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@override
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void dispose() {
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_disposed = true;
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_current.dispose();
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_currentIndex.dispose();
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}
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}
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