some code cleanup and comments

lib/pangea/controllers/base_controller.dart

@@ -1,18 +1,18 @@
 import 'dart:async';
 
 class BaseController<T> {
-  final StreamController<T> stateListener = StreamController<T>();
+  final StreamController<T> _stateListener = StreamController<T>();
   late Stream<T> stateStream;
 
   BaseController() {
-    stateStream = stateListener.stream.asBroadcastStream();
+    stateStream = _stateListener.stream.asBroadcastStream();
   }
 
   dispose() {
-    stateListener.close();
+    _stateListener.close();
   }
 
   setState(T data) {
-    stateListener.add(data);
+    _stateListener.add(data);
   }
 }

lib/pangea/controllers/user_controller.dart

@@ -121,19 +121,26 @@ class UserController extends BaseController {
   /// Initializes the user's profile by waiting for account data to load, reading in account
   /// data to profile, and migrating from the pangea profile if the account data is not present.
   Future<void> _initialize() async {
+    // wait for account data to load
+    // as long as it's not null, then this we've already migrated the profile
     await _pangeaController.matrixState.client.waitForAccountData();
     if (profile.userSettings.dateOfBirth != null) {
       return;
     }
 
+    // we used to store the user's profile in the pangea server
+    // we now store it in the matrix account data
     final PangeaProfileResponse? resp = await PUserRepo.fetchPangeaUserInfo(
       userID: userId!,
       matrixAccessToken: _matrixAccessToken!,
     );
+
+    // if it's null, we don't have a profile in the pangea server
     if (resp?.profile == null) {
       return;
     }
 
+    // if we have a profile in the pangea server, we need to migrate it to the matrix account data
     final userSetting = UserSettings.fromJson(resp!.profile.toJson());
     final newProfile = Profile(userSettings: userSetting);
     await newProfile.saveProfileData(waitForDataInSync: true);

lib/pangea/enum/construct_use_type_enum.dart

@@ -125,3 +125,12 @@ extension ConstructUseTypeExtension on ConstructUseTypeEnum {
     }
   }
 }
+
+class ConstructUseTypeUtil {
+  static ConstructUseTypeEnum fromString(String value) {
+    return ConstructUseTypeEnum.values.firstWhere(
+      (e) => e.string == value,
+      orElse: () => ConstructUseTypeEnum.nan,
+    );
+  }
+}

lib/pangea/models/analytics/constructs_model.dart

@@ -1,6 +1,5 @@
 import 'dart:developer';
 
-import 'package:collection/collection.dart';
 import 'package:fluffychat/pangea/enum/construct_use_type_enum.dart';
 import 'package:fluffychat/pangea/utils/error_handler.dart';
 import 'package:flutter/foundation.dart';
@@ -106,9 +105,7 @@ class OneConstructUse {
     debugger(when: kDebugMode && constructType == null);
 
     return OneConstructUse(
-      useType: ConstructUseTypeEnum.values
-              .firstWhereOrNull((e) => e.string == json['useType']) ??
-          ConstructUseTypeEnum.unk,
+      useType: ConstructUseTypeUtil.fromString(json['useType']),
       lemma: json['lemma'],
       form: json['form'],
       categories: json['categories'] != null

lib/pangea/models/practice_activities.dart/message_activity_request.dart

@@ -27,12 +27,7 @@ class ConstructWithXP {
           ? DateTime.parse(json['last_used'] as String)
           : null,
       condensedConstructUses: (json['uses'] as List<String>).map((e) {
-        return ConstructUseTypeEnum.values.firstWhereOrNull(
-              (element) =>
-                  element.string == e ||
-                  element.toString().split('.').last == e,
-            ) ??
-            ConstructUseTypeEnum.nan;
+        return ConstructUseTypeUtil.fromString(e);
       }).toList(),
     );
   }