Implement fetchUser() gRPC method in user_handler.dart and update…

… `user_viewmodel.dart`

lib/base/networking/api/user_handler.dart

@@ -1,19 +1,20 @@
-import 'package:gocast_mobile/models/user/user_model.dart';
-import 'package:gocast_mobile/base/helpers/model_generator.dart';
+import 'package:gocast_mobile/base/networking/api/grpc_handler.dart';
+import 'package:gocast_mobile/base/networking/api/gocast/api_v2.pbgrpc.dart';
+import 'package:gocast_mobile/models/user/user_model.dart' as model;
 
 /// Class responsible for fetching and posting user-related data (e.g., fetch user details, update usersettings, etc.)
 class UserHandler {
-  // Generate user mock for testing the views until API/v2 is implemented
+  final GrpcHandler _grpcHandler;
 
-  /// Performs SSO authentication.
-  ///
-  /// This method opens the SSO login page in a web view. After the user logs in,
-  /// it saves the JWT token and redirects back to the app.
-  ///
-  /// Throws an [AppError] if a network error occurs or if no JWT-cookie is set.
+  UserHandler(this._grpcHandler);
 
-  static Future<User> fetchUser() async {
-    // TODO: Fetch user information from API (preferably over gRPC) - see issues
-    return ModelGenerator.generateRandomUser();
+  Future<model.User> fetchUser() async {
+    return await _grpcHandler.callGrpcMethod(
+      (client) async {
+        final response = await client.getUser(GetUserRequest());
+        // Deserialize the gRPC response into a User instance
+        return model.User.fromProto(response.user);
+      },
+    );
   }
 }

lib/view_models/user_viewmodel.dart

@@ -2,6 +2,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:gocast_mobile/base/networking/api/auth_handler.dart';
+import 'package:gocast_mobile/base/networking/api/grpc_handler.dart';
 import 'package:gocast_mobile/base/networking/api/user_handler.dart';
 import 'package:gocast_mobile/models/user/user_model.dart';
 import 'package:gocast_mobile/models/user/user_state_model.dart';
@@ -12,27 +13,30 @@ class UserViewModel {
   BehaviorSubject<UserState> current =
       BehaviorSubject.seeded(UserState.defaultConstructor());
 
-  // Sign in user and store cookie
+  final GrpcHandler _grpcHandler;
+
+  UserViewModel(this._grpcHandler);
   Future<void> basicAuth(String email, String password) async {
     await AuthHandler.basicAuth(email, password).then(
-      (value) => UserHandler.fetchUser().then(
-        (value) => current.value.setUser(value),
-        onError: (error) => current.addError(error),
-      ),
+      (value) => _fetchUser(),
       onError: (error) => current.addError(error),
     );
   }
 
   Future<void> ssoAuth(BuildContext context) async {
     await AuthHandler.ssoAuth(context).then(
-      (value) => UserHandler.fetchUser().then(
-        (value) => current.value.setUser(value),
-        onError: (error) => current.addError(error),
-      ),
+      (value) => _fetchUser(),
       onError: (error) => current.addError(error),
     );
   }
 
+  Future<void> _fetchUser() async {
+    await UserHandler(_grpcHandler).fetchUser().then(
+          (value) => current.value.setUser(value as User),
+          onError: (error) => current.addError(error),
+        );
+  }
+
   Future<void> logout() async {
     current.value.removeUser();
     current.value = UserState.defaultConstructor();

lib/views/settings_screen.dart

@@ -33,7 +33,9 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
             leading: const CircleAvatar(
               backgroundImage: AssetImage('path_to_your_profile_image'),
             ),
-            title: const Text('Max Mustermann'),
+            title: Text(
+              ref.read(userViewModel).current.value.user?.name ?? 'Guest',
+            ),
             onTap: () {
               // Navigate to profile edit screen
             },