feat(fitbit): update sleep data model and sleep fetch

- Replace dateOfSleep with entryDateTime in FitbitSleepData
- Modify _fetchSleepData to accommodate new structure
- Update question construction to handle list of FitbitData

app/lib/util/fitbit_handler.dart

@@ -218,6 +218,38 @@ class FitbitHandler {
         .toList();
   }
 
+  static Future<List<FitbitSleepData>> _fetchSleepData(
+    FitbitCredentials studyCredentials,
+    fitbitter.FitbitCredentials credentials,
+    DateTime date,
+  ) async {
+    final fitbitter.FitbitSleepDataManager fitbitSleepDataManager =
+        fitbitter.FitbitSleepDataManager(
+      clientID: studyCredentials.clientId,
+      clientSecret: studyCredentials.clientSecret,
+    );
+
+    final fitbitter.FitbitSleepAPIURL fitbitSleepAPIURL =
+        fitbitter.FitbitSleepAPIURL.listAndAfterDate(
+      afterDate: date,
+      fitbitCredentials: credentials,
+    );
+
+    final List<fitbitter.FitbitSleepData> fitbitSleepData =
+        await fitbitSleepDataManager.fetch(fitbitSleepAPIURL)
+            as List<fitbitter.FitbitSleepData>;
+
+    return fitbitSleepData
+        .map(
+          (data) => FitbitSleepData(
+            data.level!,
+            data.entryDateTime!,
+            data.dateOfSleep!,
+          ),
+        )
+        .toList();
+  }
+
   static Future<List<FitbitData>> syncFitbitData(
     Study study,
     FitbitQuestion question,

app/lib/widgets/questionnaire/questions/fitbit_question_widget.dart

@@ -45,6 +45,8 @@ class _FitbitQuestionWidgetState extends State<FitbitQuestionWidget> {
           'Synced Fitbit Data: ${(data as FitbitHeartData).value}');
     }
     StudyULogger.info('Synced Fitbit Data');
+
+    widget.onDone!(widget.question.constructAnswer(success));
   }
 
   @override

core/lib/src/models/fitbit/fitbit_datas/fitbit_sleep_data.dart

@@ -6,12 +6,12 @@ part 'fitbit_sleep_data.g.dart';
 @JsonSerializable()
 class FitbitSleepData extends FitbitData {
   static const String dataType = 'steps';
-  DateTime dateOfSleep;
   String level;
+  DateTime entryDateTime;
 
   FitbitSleepData(
-    this.dateOfSleep,
     this.level,
+    this.entryDateTime,
     DateTime dateTime,
   ) : super(dataType, dateTime);
 

core/lib/src/models/questionnaire/questions/fitbit_question.dart

@@ -26,7 +26,8 @@ class FitbitQuestion extends Question<FitbitQuestion> {
   @override
   Map<String, dynamic> toJson() => _$FitbitQuestionToJson(this);
 
-  Answer<FitbitData> constructAnswer(FitbitData data) => Answer.forQuestion(
+  Answer<List<FitbitData>> constructAnswer(List<FitbitData> data) =>
+      Answer.forQuestion(
         this,
         data,
       );

designer_v2/lib/features/design/shared/questionnaire/question/question_form_data.dart

@@ -670,23 +670,23 @@ class FitbitQuestionFormData extends QuestionFormData {
     return data;
   }
 
-  FitbitData _buildQuestionValue(String value) {
-    final FitbitQuestionType fitbitType = FitbitQuestionType.fromJson(value);
+  List<FitbitData> _buildQuestionValue(String value) {
+    final fitbitType = FitbitQuestionType.fromJson(value);
 
     switch (fitbitType) {
       case FitbitQuestionType.heartrate:
-        return FitbitHeartData(0, DateTime.now());
+        return [FitbitHeartData(0, DateTime.now())];
       case FitbitQuestionType.steps:
-        return FitbitStepData(0, DateTime.now());
+        return [FitbitStepData(0, DateTime.now())];
       case FitbitQuestionType.sleep:
-        return FitbitSleepData(DateTime.now(), 'deep', DateTime.now());
+        return [FitbitSleepData('deep', DateTime.now(), DateTime.now())];
     }
   }
 
   @override
   Answer constructAnswerFor(dynamic responseOption) {
     final question = toQuestion() as FitbitQuestion;
-    final fitbitData = _buildQuestionValue(responseOption);
+    final fitbitData = _buildQuestionValue(responseOption as String);
 
     return question.constructAnswer(fitbitData);
   }