Show album examples in search section + refactor

lib/models/search/search_types.dart

@@ -1,6 +1,5 @@
 import "package:flutter/material.dart";
 import "package:photos/generated/l10n.dart";
-import "package:photos/models/search/generic_search_result.dart";
 import "package:photos/models/search/search_result.dart";
 import "package:photos/services/search_service.dart";
 
@@ -164,28 +163,28 @@ extension SectionTypeExtensions on SectionType {
   Future<List<SearchResult>> getData({int? limit}) {
     switch (this) {
       case SectionType.face:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllLocationTags(limit);
 
       case SectionType.content:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllLocationTags(limit);
 
       case SectionType.moment:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllLocationTags(limit);
 
       case SectionType.location:
         return SearchService.instance.getAllLocationTags(limit);
 
       case SectionType.people:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllLocationTags(limit);
 
       case SectionType.album:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllCollectionSearchResults(limit);
 
       case SectionType.fileTypesAndExtension:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllLocationTags(limit);
 
       case SectionType.fileCaption:
-        return Future.value([GenericSearchResult(ResultType.file, "", [])]);
+        return SearchService.instance.getAllLocationTags(limit);
     }
   }
 }

lib/services/search_service.dart

@@ -88,6 +88,30 @@ class SearchService {
     return collectionSearchResults;
   }
 
+  Future<List<AlbumSearchResult>> getAllCollectionSearchResults(
+    int? limit,
+  ) async {
+    final List<Collection> collections = _collectionService.getCollectionsForUI(
+      includedShared: true,
+    );
+
+    final List<AlbumSearchResult> collectionSearchResults = [];
+
+    for (var c in collections) {
+      if (limit != null && collectionSearchResults.length >= limit) {
+        break;
+      }
+
+      if (!c.isHidden() && c.type != CollectionType.uncategorized) {
+        final EnteFile? thumbnail = await _collectionService.getCover(c);
+        collectionSearchResults
+            .add(AlbumSearchResult(CollectionWithThumbnail(c, thumbnail)));
+      }
+    }
+
+    return collectionSearchResults;
+  }
+
   Future<List<GenericSearchResult>> getYearSearchResults(
     String yearFromQuery,
   ) async {

lib/ui/search_tab.dart

@@ -48,11 +48,20 @@ class AllSearchSections extends StatefulWidget {
 }
 
 class _AllSearchSectionsState extends State<AllSearchSections> {
-  late Future<List<List<SearchResult>>> allFutures;
-  final locationTags = SectionType.location.getData(limit: 7);
+  late Future<List<List<SearchResult>>> allExamplesSearchResults;
+
   @override
   void initState() {
-    allFutures = Future.wait<List<SearchResult>>([locationTags]);
+    final exampleSearchResults = <Future<List<SearchResult>>>[];
+    for (SectionType sectionType in SectionType.values) {
+      if (sectionType == SectionType.face ||
+          sectionType == SectionType.content) {
+        continue;
+      }
+      exampleSearchResults.add(sectionType.getData(limit: 7));
+    }
+    allExamplesSearchResults =
+        Future.wait<List<SearchResult>>(exampleSearchResults);
     super.initState();
   }
 
@@ -66,7 +75,7 @@ class _AllSearchSectionsState extends State<AllSearchSections> {
     searchTypes.remove(SectionType.content);
     return Expanded(
       child: FutureBuilder(
-        future: allFutures,
+        future: allExamplesSearchResults,
         builder: (context, snapshot) {
           if (snapshot.hasData) {
             return ListView.builder(
@@ -75,7 +84,7 @@ class _AllSearchSectionsState extends State<AllSearchSections> {
               itemBuilder: (context, index) {
                 return SearchSection(
                   sectionType: searchTypes[index],
-                  examples: snapshot.data!.first,
+                  examples: snapshot.data!.elementAt(index),
                 );
               },
             );

lib/ui/viewer/search/search_section.dart

@@ -5,6 +5,7 @@ import "package:photos/models/search/generic_search_result.dart";
 import "package:photos/models/search/search_result.dart";
 import "package:photos/models/search/search_types.dart";
 import "package:photos/theme/ente_theme.dart";
+import "package:photos/ui/viewer/file/no_thumbnail_widget.dart";
 import "package:photos/ui/viewer/file/thumbnail_widget.dart";
 import "package:photos/ui/viewer/gallery/collection_page.dart";
 import "package:photos/ui/viewer/search/search_section_cta.dart";
@@ -125,10 +126,12 @@ class SearchExample extends StatelessWidget {
                 height: 64,
                 child: ClipRRect(
                   borderRadius: BorderRadius.circular(32),
-                  child: ThumbnailWidget(
-                    searchResult.previewThumbnail()!,
-                    shouldShowSyncStatus: false,
-                  ),
+                  child: searchResult.previewThumbnail() != null
+                      ? ThumbnailWidget(
+                          searchResult.previewThumbnail()!,
+                          shouldShowSyncStatus: false,
+                        )
+                      : const NoThumbnailWidget(),
                 ),
               ),
               const SizedBox(