refactored room and file sorting to use direct comparators instead of temporary sort strings, removed obsolete 'sort' properties from API models, and improved file list sorting with case-insensitive name comparisons and null-safe date handling

lib/api/marianumcloud/talk/room/get_room_response.dart

@@ -16,26 +16,20 @@ class GetRoomResponse extends ApiResponse {
   Map<String, dynamic> toJson() => _$GetRoomResponseToJson(this);
 
   List<GetRoomResponseObject> sortBy({
-    bool lastActivity = true,
     required bool favoritesToTop,
     required bool unreadToTop,
   }) {
-    for (var chat in data) {
-      final buffer = StringBuffer();
-
-      if (favoritesToTop) {
-        buffer.write(chat.isFavorite ? 'b' : 'a');
+    return data.toList()..sort((a, b) {
+      if (favoritesToTop && a.isFavorite != b.isFavorite) {
+        return a.isFavorite ? -1 : 1;
       }
       if (unreadToTop) {
-        buffer.write(chat.unreadMessages > 0 ? 'b' : 'a');
+        final aUnread = a.unreadMessages > 0;
+        final bUnread = b.unreadMessages > 0;
+        if (aUnread != bUnread) return aUnread ? -1 : 1;
       }
-
-      buffer.write(chat.lastActivity);
-
-      chat.sort = buffer.toString();
-    }
-
-    return data.toList()..sort((a, b) => b.sort!.compareTo(a.sort!));
+      return b.lastActivity.compareTo(a.lastActivity);
+    });
   }
 }
 
@@ -71,7 +65,6 @@ class GetRoomResponseObject {
   String? status;
   String? statusIcon;
   String? statusMessage;
-  String? sort;
 
   GetRoomResponseObject(
     this.id,

lib/api/marianumcloud/talk/room/get_room_response.g.dart

@@ -60,7 +60,7 @@ GetRoomResponseObject _$GetRoomResponseObjectFromJson(
   json['status'] as String?,
   json['statusIcon'] as String?,
   json['statusMessage'] as String?,
-)..sort = json['sort'] as String?;
+);
 
 Map<String, dynamic> _$GetRoomResponseObjectToJson(
   GetRoomResponseObject instance,
@@ -97,7 +97,6 @@ Map<String, dynamic> _$GetRoomResponseObjectToJson(
   'status': instance.status,
   'statusIcon': instance.statusIcon,
   'statusMessage': instance.statusMessage,
-  'sort': instance.sort,
 };
 
 const _$GetRoomResponseObjectConversationTypeEnumMap = {

lib/api/marianumcloud/webdav/queries/list_files/cacheable_file.dart

@@ -13,7 +13,6 @@ class CacheableFile {
   String? eTag;
   DateTime? createdAt;
   DateTime? modifiedAt;
-  String? sort;
 
   /// Nextcloud's instance-local file id (`oc:fileid`). Used to address the
   /// preview API by id, which is more reliable than the path-based variant

lib/api/marianumcloud/webdav/queries/list_files/cacheable_file.g.dart

@@ -22,7 +22,7 @@ CacheableFile _$CacheableFileFromJson(Map<String, dynamic> json) =>
           : DateTime.parse(json['modifiedAt'] as String),
       fileId: (json['fileId'] as num?)?.toInt(),
       hasPreview: json['hasPreview'] as bool?,
-    )..sort = json['sort'] as String?;
+    );
 
 Map<String, dynamic> _$CacheableFileToJson(CacheableFile instance) =>
     <String, dynamic>{
@@ -34,7 +34,6 @@ Map<String, dynamic> _$CacheableFileToJson(CacheableFile instance) =>
       'eTag': instance.eTag,
       'createdAt': instance.createdAt?.toIso8601String(),
       'modifiedAt': instance.modifiedAt?.toIso8601String(),
-      'sort': instance.sort,
       'fileId': instance.fileId,
       'hasPreview': instance.hasPreview,
     };

lib/api/marianumcloud/webdav/queries/list_files/list_files_response.dart

@@ -1,4 +1,3 @@
-import 'package:jiffy/jiffy.dart';
 import 'package:json_annotation/json_annotation.dart';
 
 import '../../../../../view/pages/files/data/sort_options.dart';
@@ -22,60 +21,19 @@ class ListFilesResponse extends ApiResponse {
     SortOption sortOption = SortOption.name,
     bool reversed = false,
   }) {
-    var list = List<CacheableFile>.empty(growable: true);
+    final ascending = SortOptions.getOption(sortOption).compare;
+    // `reversed=true` means user picked "Aufsteigend" (a→z, oldest→newest,
+    // smallest→largest); default is descending.
+    final compare = reversed
+        ? ascending
+        : (CacheableFile a, CacheableFile b) => ascending(b, a);
 
-    if (foldersToTop) {
-      list.addAll(
-        _sort(
-          files.where((element) => element.isDirectory).toSet(),
-          reversed: reversed,
-          sortOption: sortOption,
-        ),
-      );
-      list.addAll(
-        _sort(
-          files.where((element) => !element.isDirectory).toSet(),
-          reversed: reversed,
-          sortOption: sortOption,
-        ),
-      );
-    } else {
-      list.addAll(_sort(files, reversed: reversed, sortOption: sortOption));
+    if (!foldersToTop) {
+      return files.toList()..sort(compare);
     }
 
-    return list;
-  }
-
-  List<CacheableFile> _sort(
-    Set<CacheableFile> files, {
-    SortOption sortOption = SortOption.name,
-    bool reversed = false,
-  }) {
-    for (var file in files) {
-      final buffer = StringBuffer();
-
-      switch (sortOption) {
-        case SortOption.date:
-          buffer.write(
-            Jiffy.parseFromMillisecondsSinceEpoch(
-              file.modifiedAt?.millisecondsSinceEpoch ?? 0,
-            ).format(pattern: 'yyyyMMddhhmmss'),
-          );
-          break;
-
-        case SortOption.name:
-          buffer.write(file.name.toLowerCase());
-          break;
-
-        case SortOption.size:
-          buffer.write(file.size);
-          break;
-      }
-
-      file.sort = buffer.toString();
-    }
-
-    var list = files.toList()..sort((a, b) => b.sort!.compareTo(a.sort!));
-    return reversed ? list.reversed.toList() : list;
+    final folders = files.where((f) => f.isDirectory).toList()..sort(compare);
+    final regular = files.where((f) => !f.isDirectory).toList()..sort(compare);
+    return [...folders, ...regular];
   }
 }

lib/view/pages/files/data/sort_options.dart

@@ -21,12 +21,16 @@ class SortOptions {
     SortOption.name: BetterSortOption(
       displayName: 'Name',
       icon: Icons.sort_by_alpha_outlined,
-      compare: (a, b) => a.name.compareTo(b.name),
+      compare: (a, b) => a.name.toLowerCase().compareTo(b.name.toLowerCase()),
     ),
     SortOption.date: BetterSortOption(
       displayName: 'Datum',
       icon: Icons.history_outlined,
-      compare: (a, b) => a.modifiedAt!.compareTo(b.modifiedAt!),
+      compare: (a, b) {
+        final aMs = a.modifiedAt?.millisecondsSinceEpoch ?? 0;
+        final bMs = b.modifiedAt?.millisecondsSinceEpoch ?? 0;
+        return aMs.compareTo(bMs);
+      },
     ),
     SortOption.size: BetterSortOption(
       displayName: 'Größe',

lib/view/pages/share_intent/share_chat_picker.dart

@@ -100,7 +100,6 @@ class ShareChatPicker extends StatelessWidget {
           if (rooms == null) return const SizedBox.shrink();
           final sorted = rooms
               .sortBy(
-                lastActivity: true,
                 favoritesToTop: talkSettings.sortFavoritesToTop,
                 unreadToTop: talkSettings.sortUnreadToTop,
               )

lib/view/pages/talk/chat_list.dart

@@ -162,7 +162,6 @@ class _ChatListViewState extends State<_ChatListView> {
                   .val()
                   .talkSettings;
               final sorted = rooms.sortBy(
-                lastActivity: true,
                 favoritesToTop: talkSettings.sortFavoritesToTop,
                 unreadToTop: talkSettings.sortUnreadToTop,
               );