[mob][photos] Show magic filter recommendations for a gallery using magic cache used for the discovery section

mobile/lib/models/search/hierarchical/magic_filter.dart

@@ -1,41 +1,48 @@
-import "package:flutter/widgets.dart";
+import "package:flutter/material.dart";
 import "package:photos/models/file/file.dart";
 import "package:photos/models/search/hierarchical/hierarchical_search_filter.dart";
 
 class MagicFilter extends HierarchicalSearchFilter {
+  final String filterName;
+  final int occurrence;
+
+  MagicFilter({
+    required this.filterName,
+    required this.occurrence,
+    super.matchedUploadedIDs,
+  });
+
   @override
   Set<int> getMatchedUploadedIDs() {
-    // TODO: implement getMatchedUploadedIDs
-    throw UnimplementedError();
+    return matchedUploadedIDs;
   }
 
   @override
   IconData? icon() {
-    // TODO: implement icon
-    throw UnimplementedError();
+    return Icons.auto_awesome;
   }
 
   @override
   bool isMatch(EnteFile file) {
-    // TODO: implement isMatch
     throw UnimplementedError();
   }
 
   @override
   bool isSameFilter(HierarchicalSearchFilter other) {
-    // TODO: implement isSameFilter
-    throw UnimplementedError();
+    if (other is MagicFilter && other.name() == name()) {
+      return true;
+    }
+
+    return false;
   }
 
   @override
   String name() {
-    // TODO: implement name
-    throw UnimplementedError();
+    return filterName;
   }
 
   @override
   int relevance() {
-    // TODO: implement relevance
-    throw UnimplementedError();
+    return occurrence;
   }
 }

mobile/lib/services/magic_cache_service.dart

@@ -16,6 +16,7 @@ import "package:photos/models/file/extensions/file_props.dart";
 import "package:photos/models/file/file.dart";
 import "package:photos/models/ml/discover/prompt.dart";
 import "package:photos/models/search/generic_search_result.dart";
+import "package:photos/models/search/hierarchical/hierarchical_search_filter.dart";
 import "package:photos/models/search/hierarchical/magic_filter.dart";
 import "package:photos/models/search/search_types.dart";
 import "package:photos/service_locator.dart";
@@ -141,12 +142,18 @@ GenericSearchResult? toGenericSearchResult(
             ResultType.magic,
             title,
             enteFilesInMagicCache,
-            hierarchicalSearchFilter: MagicFilter(),
+            hierarchicalSearchFilter:
+                //TODO: Check if matchedUploadedIDs should be passed
+                MagicFilter(filterName: title, occurrence: kMostRelevantFilter),
           ).heroTag(),
         ),
       );
     },
-    hierarchicalSearchFilter: MagicFilter(),
+    //TODO: Check if matchedUploadedIDs should be passed
+    hierarchicalSearchFilter: MagicFilter(
+      filterName: title,
+      occurrence: kMostRelevantFilter,
+    ),
   );
 }
 
@@ -269,7 +276,7 @@ class MagicCacheService {
     return _promptFuture!;
   }
 
-  Future<List<MagicCache>> _getMagicCache() async {
+  Future<List<MagicCache>> getMagicCache() async {
     if (_magicCacheFuture != null) {
       return _magicCacheFuture!;
     }
@@ -310,7 +317,7 @@ class MagicCacheService {
       final EnteWatch? w =
           kDebugMode ? EnteWatch("magicGenericSearchResult") : null;
       w?.start();
-      final magicCaches = await _getMagicCache();
+      final magicCaches = await getMagicCache();
       final List<Prompt> prompts = await getPrompts();
       if (magicCaches.isEmpty) {
         w?.log("No magic cache found");

mobile/lib/services/search_service.dart

@@ -1240,12 +1240,20 @@ class SearchService {
                   ResultType.magic,
                   query,
                   files,
-                  hierarchicalSearchFilter: MagicFilter(),
+                  hierarchicalSearchFilter: MagicFilter(
+                    filterName: query,
+                    occurrence: kMostRelevantFilter,
+                    matchedUploadedIDs: filesToUploadedFileIDs(files),
+                  ),
                 ).heroTag(),
               ),
             );
           },
-          hierarchicalSearchFilter: MagicFilter(),
+          hierarchicalSearchFilter: MagicFilter(
+            filterName: query,
+            occurrence: kMostRelevantFilter,
+            matchedUploadedIDs: filesToUploadedFileIDs(files),
+          ),
         ),
       );
     }

mobile/lib/utils/hierarchical_search_util.dart

@@ -16,12 +16,15 @@ import "package:photos/models/search/hierarchical/face_filter.dart";
 import "package:photos/models/search/hierarchical/file_type_filter.dart";
 import "package:photos/models/search/hierarchical/hierarchical_search_filter.dart";
 import "package:photos/models/search/hierarchical/location_filter.dart";
+import "package:photos/models/search/hierarchical/magic_filter.dart";
 import "package:photos/services/collections_service.dart";
 import "package:photos/services/location_service.dart";
 import "package:photos/services/machine_learning/face_ml/face_filtering/face_filtering_constants.dart";
 import "package:photos/services/machine_learning/face_ml/person/person_service.dart";
+import "package:photos/services/magic_cache_service.dart";
 import "package:photos/services/search_service.dart";
 import "package:photos/ui/viewer/gallery/state/search_filter_data_provider.dart";
+import "package:photos/utils/file_util.dart";
 
 Future<List<EnteFile>> getFilteredFiles(
   List<HierarchicalSearchFilter> filters,
@@ -118,9 +121,11 @@ void curateFilters(
     );
     final contactsFilters = _curateContactsFilter(files);
     final faceFilters = await curateFaceFilters(files);
+    final magicFilters = await curateMagicFilters(files);
 
     searchFilterDataProvider.clearAndAddRecommendations(
       [
+        ...magicFilters,
         ...faceFilters,
         ...fileTypeFilters,
         ...contactsFilters,
@@ -358,3 +363,25 @@ Future<List<FaceFilter>> curateFaceFilters(
     rethrow;
   }
 }
+
+Future<List<MagicFilter>> curateMagicFilters(List<EnteFile> files) async {
+  final magicFilters = <MagicFilter>[];
+
+  final magicCaches = await MagicCacheService.instance.getMagicCache();
+  final filesUploadedFileIDs = filesToUploadedFileIDs(files);
+  for (MagicCache magicCache in magicCaches) {
+    final uploadedIDs = magicCache.fileUploadedIDs.toSet();
+    final intersection = uploadedIDs.intersection(filesUploadedFileIDs);
+
+    if (intersection.length > 3) {
+      magicFilters.add(
+        MagicFilter(
+          filterName: magicCache.title,
+          occurrence: intersection.length,
+        ),
+      );
+    }
+  }
+
+  return magicFilters;
+}