flagging

packages/practice_engine/lib/logic/deck_service.dart

@@ -25,6 +25,20 @@ class DeckService {
     return deck.copyWith(questions: updatedQuestions);
   }
 
+  /// Toggles the flagged state of a question.
+  static Deck toggleQuestionFlag({
+    required Deck deck,
+    required String questionId,
+  }) {
+    final updatedQuestions = deck.questions.map((q) {
+      if (q.id == questionId) {
+        return q.copyWith(isFlagged: !q.isFlagged);
+      }
+      return q;
+    }).toList();
+    return deck.copyWith(questions: updatedQuestions);
+  }
+
   /// Marks a question as needs practice (manual override).
   ///
   /// Sets isKnown to false and streak to 0, but keeps priority unchanged.