initial codex commit

lib/services/authservice.dart

@@ -1,9 +1,12 @@
 import 'package:flutter/foundation.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/apiService.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 class AuthService extends ChangeNotifier {
   final ApiService api;
+  static const _tokenKey = 'auth_token';
+  bool _restoring = false;
 
   AuthService({required this.api});
 
@@ -29,6 +32,7 @@ class AuthService extends ChangeNotifier {
       access_token: accessToken,
       email: email,
     );
+    _persistToken(accessToken);
     notifyListeners();
   }
 
@@ -65,8 +69,66 @@ class AuthService extends ChangeNotifier {
     );
   }
 
+  Future<void> tryRestoreSession() async {
+    if (_restoring || _user != null) return;
+    _restoring = true;
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final token = prefs.getString(_tokenKey);
+      if (token == null || token.isEmpty) return;
+      final userResponse = await api.get(
+        '/users/me',
+        headers: {
+          'Authorization': 'Bearer $token',
+          'accept': 'application/json',
+        },
+      );
+      setLoginData(
+        userId: userResponse['user_id'],
+        username: userResponse['username'],
+        fullName: userResponse['full_name'],
+        accessToken: token,
+        email: userResponse['email'],
+      );
+    } catch (_) {
+      await _clearToken();
+    } finally {
+      _restoring = false;
+    }
+  }
+
+  Future<void> _persistToken(String token) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_tokenKey, token);
+  }
+
+  Future<void> _clearToken() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.remove(_tokenKey);
+  }
+
+  Future<void> register({
+    required String username,
+    required String email,
+    required String fullName,
+    required String password,
+    String inviteCode = '',
+  }) async {
+    final formData = {
+      'user_name': username,
+      'email': email,
+      'full_name': fullName,
+      'password': password,
+      'invitation_code': inviteCode,
+      'empty': '',
+      'empty2': '',
+    };
+    await api.postForm('/register', formData);
+  }
+
   void logout() {
     _user = null;
+    _clearToken();
     notifyListeners();
   }
 }