Add variable question distractor pools

api/QuestionsApi/Services/QuestionAttemptStore.cs

@@ -34,13 +34,16 @@ public class QuestionAttemptStore
         string userId,
         string choiceId,
         bool isCorrect,
-        bool isSkip = false)
+        bool isSkip = false,
+        IReadOnlyCollection<string>? presentedChoiceIds = null)
     {
         var attempt = new QuestionAttempt
         {
             QuestionExternalId = questionExternalId,
             UserId = userId,
             ChoiceId = choiceId,
+            PresentedChoiceIds = presentedChoiceIds?.ToList() ?? [],
+            TracksPresentation = presentedChoiceIds is { Count: > 0 },
             IsCorrect = isCorrect,
             IsSkip = isSkip,
             CounterBucket = GetCounterBucket(userId),
@@ -62,49 +65,6 @@ public class QuestionAttemptStore
         }
     }
 
-    public async Task<Dictionary<string, int>> GetPercentagesForQuestionAsync(string questionExternalId)
-    {
-        var results = await GetPercentagesByQuestionAsync([questionExternalId]);
-        return results.GetValueOrDefault(questionExternalId, []);
-    }
-
-    public async Task<Dictionary<string, Dictionary<string, int>>> GetPercentagesByQuestionAsync(IEnumerable<string> questionExternalIds)
-    {
-        var ids = questionExternalIds.Where(id => !string.IsNullOrWhiteSpace(id)).Distinct().ToList();
-        if (ids.Count == 0)
-            return [];
-
-        var totals = await _col.Aggregate()
-            .Match(a => ids.Contains(a.QuestionExternalId) && !a.IsSkip)
-            .Group(
-                attempt => new { attempt.QuestionExternalId, attempt.ChoiceId },
-                group => new QuestionAttemptCounterTotal
-                {
-                    Key = new QuestionChoiceCounterKey
-                    {
-                        QuestionExternalId = group.Key.QuestionExternalId,
-                        ChoiceId = group.Key.ChoiceId
-                    },
-                    Count = group.Sum(_ => 1L)
-                })
-            .ToListAsync();
-        var output = new Dictionary<string, Dictionary<string, int>>();
-
-        foreach (var group in totals.GroupBy(total => total.Key.QuestionExternalId))
-        {
-            var total = group.Sum(item => item.Count);
-            if (total == 0)
-                continue;
-
-            output[group.Key] = group
-                .ToDictionary(
-                    item => item.Key.ChoiceId,
-                    item => (int)Math.Round(item.Count * 100.0 / total));
-        }
-
-        return output;
-    }
-
     public Task<List<string>> GetActiveQuestionIdsAsync(DateTime sinceUtc) =>
         _col.Distinct(
             attempt => attempt.QuestionExternalId,