[mob][photos] Deletion fixes (#5792)

## Description

- Fix issue where user is not able to delete own files in a shared album
- Fix issue where deletion of not yet uploaded files leads to showing
grey boxes in gallery

## Tests

Tested in debug mode on my pixel phone.

mobile/lib/models/gallery_type.dart

@@ -104,6 +104,7 @@ extension GalleyTypeExtension on GalleryType {
   bool showDeleteOption() {
     switch (this) {
       case GalleryType.ownedCollection:
+      case GalleryType.sharedCollection:
       case GalleryType.searchResults:
       case GalleryType.homepage:
       case GalleryType.favorite:
@@ -119,7 +120,6 @@ extension GalleyTypeExtension on GalleryType {
       case GalleryType.magic:
         return true;
       case GalleryType.trash:
-      case GalleryType.sharedCollection:
       case GalleryType.sharedPublicCollection:
         return false;
     }

mobile/lib/services/collections_service.dart

@@ -388,6 +388,16 @@ class CollectionsService {
         .toList();
   }
 
+  List<int> getAllOwnedCollectionIDs() {
+    final int userID = _config.getUserID()!;
+    return _collectionIDToCollections.values
+        .where(
+          (c) => !c.isDeleted && c.isOwner(userID),
+        )
+        .map((e) => e.id)
+        .toList();
+  }
+
   SharedCollections getSharedCollections() {
     final List<Collection> outgoing = [];
     final List<Collection> incoming = [];

mobile/lib/services/sync/trash_sync_service.dart

@@ -7,6 +7,7 @@ import "package:ente_crypto/ente_crypto.dart";
 import 'package:logging/logging.dart';
 import 'package:photos/core/constants.dart';
 import 'package:photos/core/event_bus.dart';
+import "package:photos/db/files_db.dart";
 import 'package:photos/db/trash_db.dart';
 import 'package:photos/events/collection_updated_event.dart';
 import 'package:photos/events/force_reload_trash_page_event.dart';
@@ -17,6 +18,7 @@ import 'package:photos/models/file/file.dart';
 import 'package:photos/models/file/trash_file.dart';
 import 'package:photos/models/ignored_file.dart';
 import "package:photos/models/metadata/file_magic.dart";
+import "package:photos/services/collections_service.dart";
 import 'package:photos/services/ignored_files_service.dart';
 import "package:photos/utils/file_key.dart";
 import 'package:shared_preferences/shared_preferences.dart';
@@ -108,10 +110,34 @@ class TrashSyncService {
   Future<void> trashFilesOnServer(List<TrashRequest> trashRequestItems) async {
     final includedFileIDs = <int>{};
     final uniqueItems = <TrashRequest>[];
+    final ownedCollectionIDs =
+        CollectionsService.instance.getAllOwnedCollectionIDs();
     for (final item in trashRequestItems) {
       if (!includedFileIDs.contains(item.fileID)) {
-        uniqueItems.add(item);
-        includedFileIDs.add(item.fileID);
+        // Check if the collectionID in the request is owned by the user
+        if (ownedCollectionIDs.contains(item.collectionID)) {
+          uniqueItems.add(item);
+          includedFileIDs.add(item.fileID);
+        } else {
+          // If not owned, use a different owned collectionID
+          final fileCollectionIDs =
+              await FilesDB.instance.getAllCollectionIDsOfFile(item.fileID);
+          bool foundAnotherOwnedCollection = false;
+          for (final collectionID in fileCollectionIDs) {
+            if (ownedCollectionIDs.contains(collectionID)) {
+              final newItem = TrashRequest(item.fileID, collectionID);
+              uniqueItems.add(newItem);
+              includedFileIDs.add(item.fileID);
+              foundAnotherOwnedCollection = true;
+              break;
+            }
+          }
+          if (!foundAnotherOwnedCollection) {
+            _logger.severe(
+              "File ${item.fileID} is not owned by the user and has no other owned collection",
+            );
+          }
+        }
       }
     }
     final requestData = <String, dynamic>{};

mobile/lib/ui/viewer/actions/file_selection_actions_widget.dart

@@ -134,6 +134,8 @@ class _FileSelectionActionsWidgetState
 
     final bool anyOwnedFiles =
         split.pendingUploads.isNotEmpty || split.ownedByCurrentUser.isNotEmpty;
+    final bool allOwnedFiles =
+        ownedAndPendingUploadFilesCount > 0 && split.ownedByOtherUsers.isEmpty;
 
     final bool anyUploadedFiles = split.ownedByCurrentUser.isNotEmpty;
     final showCollageOption = CollageCreatorPage.isValidCount(
@@ -259,7 +261,7 @@ class _FileSelectionActionsWidgetState
           icon: Icons.delete_outline,
           labelText: S.of(context).delete,
           onTap: anyOwnedFiles ? _onDeleteClick : null,
-          shouldShow: ownedAndPendingUploadFilesCount > 0,
+          shouldShow: allOwnedFiles,
         ),
       );
     }

mobile/lib/utils/delete_file_util.dart

@@ -201,6 +201,7 @@ Future<void> deleteFilesOnDeviceOnly(
   final List<String> localAssetIDs = [];
   final List<String> localSharedMediaIDs = [];
   final List<String> alreadyDeletedIDs = []; // to ignore already deleted files
+  final List<String?> localOnlyIDs = [];
   bool hasLocalOnlyFiles = false;
   for (final file in files) {
     if (file.localID != null) {
@@ -215,6 +216,7 @@ Future<void> deleteFilesOnDeviceOnly(
     }
     if (file.uploadedFileID == null) {
       hasLocalOnlyFiles = true;
+      localOnlyIDs.add(file.localID);
     }
   }
   if (hasLocalOnlyFiles && Platform.isAndroid) {
@@ -237,8 +239,12 @@ Future<void> deleteFilesOnDeviceOnly(
     if (deletedIDs.contains(file.localID) ||
         alreadyDeletedIDs.contains(file.localID)) {
       deletedFiles.add(file);
-      file.localID = null;
-      await FilesDB.instance.update(file);
+      if (hasLocalOnlyFiles && localOnlyIDs.contains(file.localID)) {
+        await FilesDB.instance.deleteLocalFile(file);
+      } else {
+        file.localID = null;
+        await FilesDB.instance.update(file);
+      }
     }
   }
   if (deletedFiles.isNotEmpty || alreadyDeletedIDs.isNotEmpty) {