intermediate

2024-12-12 09:44:33 +01:00
parent 0710116feb
commit 6b2ae28828
108 changed files with 5531 additions and 2265 deletions
@@ -0,0 +1,58 @@
+import 'dart:async';
+
+import 'package:lensai/features/search/domain/entities/abstract/i_search_suggestion_provider.dart';
+import 'package:lensai/utils/lru_cache.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:rxdart/rxdart.dart';
+
+part 'search_suggestions.g.dart';
+
+@Riverpod(keepAlive: true)
+class SearchSuggestionsRepository extends _$SearchSuggestionsRepository {
+  final LRUCache<String, List<String>> _cache;
+
+  late StreamController<String> _queryStreamController;
+
+  SearchSuggestionsRepository() : _cache = LRUCache(100);
+
+  void addQuery(String query) {
+    _queryStreamController.add(query);
+  }
+
+  @override
+  Raw<Stream<List<String>>> build(
+    ISearchSuggestionProvider suggestionsProvider,
+  ) {
+    _queryStreamController = StreamController();
+    ref.onDispose(() async {
+      await _queryStreamController.close();
+    });
+
+    return _queryStreamController.stream
+        .sampleTime(const Duration(milliseconds: 100))
+        .switchMap<List<String>>(
+      (query) {
+        if (query.isEmpty) {
+          return Stream.value([]);
+        }
+
+        final cached = _cache.get(query);
+        if (cached != null) {
+          return Stream.value(cached);
+        }
+
+        return suggestionsProvider
+            // ignore: discarded_futures
+            .getSuggestions(query)
+            // ignore: discarded_futures
+            .then((result) {
+          result.onSuccess((result) {
+            _cache.set(query, result);
+          });
+
+          return result.value;
+        }).asStream();
+      },
+    ).asBroadcastStream();
+  }
+}