102 lines
3.2 KiB
Dart
102 lines
3.2 KiB
Dart
import '../models/plex_metadata.dart';
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import 'app_logger.dart';
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import 'base_notifier.dart';
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import 'global_key_utils.dart';
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import 'hierarchical_event_mixin.dart';
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/// Event representing a media item deletion with parent chain for hierarchical invalidation
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class DeletionEvent with HierarchicalEventMixin {
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/// The ratingKey of the deleted item
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@override
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final String ratingKey;
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/// Composite key: serverId:ratingKey
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@override
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final String globalKey;
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/// Server this item belongs to
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@override
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final String serverId;
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/// Parent chain for hierarchical invalidation
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/// For an episode: [seasonRatingKey, showRatingKey]
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/// For a season: [showRatingKey]
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/// For a movie: []
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@override
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final List<String> parentChain;
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/// Media type of the deleted item
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final String mediaType;
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/// Number of leaf items (episodes) contained in the deleted item.
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/// For an episode: 1. For a season: its episode count. For a show: its total episode count.
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final int leafCount;
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/// True if only the local download was deleted (not the server-side media).
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/// Screens should only remove items for download deletions when in offline mode.
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final bool isDownloadOnly;
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DeletionEvent({
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required this.ratingKey,
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required this.serverId,
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required this.parentChain,
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required this.mediaType,
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this.leafCount = 1,
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this.isDownloadOnly = false,
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}) : globalKey = buildGlobalKey(serverId, ratingKey);
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@override
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String toString() => 'DeletionEvent(deleted: $globalKey, type: $mediaType, parents: $parentChain)';
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}
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/// Notifier for media deletion events across the app.
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///
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/// Singleton pattern following [WatchStateNotifier]. Screens subscribe
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/// to receive events when items are deleted from the server.
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class DeletionNotifier extends BaseNotifier<DeletionEvent> {
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static final DeletionNotifier _instance = DeletionNotifier._internal();
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factory DeletionNotifier() => _instance;
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DeletionNotifier._internal();
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/// Filter for events affecting a specific server
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Stream<DeletionEvent> forServer(String serverId) => stream.where((e) => e.serverId == serverId);
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/// Filter for events affecting a specific item or its children
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Stream<DeletionEvent> forItem(String ratingKey) => stream.where((e) => e.affectsItem(ratingKey));
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/// Emit a deletion event with logging
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@override
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void notify(DeletionEvent event) {
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appLogger.d('DeletionNotifier: $event');
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super.notify(event);
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}
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/// Helper to emit a deletion event from metadata
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void notifyDeleted({required PlexMetadata metadata, bool isDownloadOnly = false}) {
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notify(
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DeletionEvent(
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ratingKey: metadata.ratingKey,
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serverId: metadata.serverId ?? '',
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parentChain: _buildParentChain(metadata),
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mediaType: metadata.type,
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leafCount: metadata.leafCount ?? 1,
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isDownloadOnly: isDownloadOnly,
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),
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);
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}
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/// Build parent chain from metadata's parent keys
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List<String> _buildParentChain(PlexMetadata metadata) {
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final chain = <String>[];
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if (metadata.parentRatingKey != null) {
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chain.add(metadata.parentRatingKey!);
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}
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if (metadata.grandparentRatingKey != null) {
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chain.add(metadata.grandparentRatingKey!);
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}
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return chain;
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}
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}
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