Polish mobile UX downloads and comments

lib/backend/providers/gelbooru_provider.dart

@@ -4,11 +4,12 @@ import '../../core/errors/app_exception.dart';
 import '../../core/http/dio_client.dart';
 import '../mappers/gelbooru_mapper.dart';
 import '../models/post.dart';
+import '../models/post_comment.dart';
 import '../models/provider_health.dart';
 import '../models/top_period_filter.dart';
 import 'content_provider.dart';
 
-class GelbooruProvider implements ContentProvider {
+class GelbooruProvider implements ContentProvider, CommentProvider {
   GelbooruProvider({
     required this.id,
     required this.name,
@@ -117,6 +118,22 @@ class GelbooruProvider implements ContentProvider {
     }
   }
 
+  @override
+  Future<List<PostComment>> getComments(String postId) async {
+    final response = await _dio.get<dynamic>(
+      '/index.php',
+      queryParameters: {
+        'page': 'dapi',
+        's': 'comment',
+        'q': 'index',
+        'json': '1',
+        'post_id': postId,
+        ..._queryParameters,
+      },
+    );
+    return _commentsFromResponse(response.data, postId);
+  }
+
   Never unavailable(String message) =>
       throw ProviderUnavailableException(message);
 
@@ -129,4 +146,36 @@ class GelbooruProvider implements ContentProvider {
         const ['sort:score:desc'],
     };
   }
+
+  List<PostComment> _commentsFromResponse(dynamic data, String postId) {
+    final raw = switch (data) {
+      List() => data,
+      {'comments': final List comments} => comments,
+      {'@attributes': _, 'comment': final List comments} => comments,
+      {'comment': final List comments} => comments,
+      _ => const [],
+    };
+    return raw
+        .whereType<Map>()
+        .map((item) {
+          final json = Map<String, dynamic>.from(item);
+          return PostComment(
+            id: (json['id'] ?? json['comment_id'] ?? '').toString(),
+            postId: (json['post_id'] ?? postId).toString(),
+            providerId: id,
+            authorName: (json['creator'] ??
+                    json['creator_name'] ??
+                    json['author'] ??
+                    '')
+                .toString(),
+            body: (json['body'] ?? json['comment'] ?? '').toString(),
+            createdAt: DateTime.tryParse(
+                  (json['created_at'] ?? json['created'] ?? '').toString(),
+                ) ??
+                DateTime.fromMillisecondsSinceEpoch(0),
+          );
+        })
+        .where((comment) => comment.body.trim().isNotEmpty)
+        .toList();
+  }
 }