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lib/models/session_model.dart

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+import 'package:flutter/foundation.dart';
+
+import '../config/title_server_config.dart';
+import '../services/api_service.dart';
+import '../services/title_api_service.dart';
+
+class SessionModel extends ChangeNotifier {
+  static final SessionModel instance = SessionModel._();
+
+  SessionModel._();
+
+  final ApiService _apiService = ApiService();
+
+  LoginResult? _loginResult;
+  UserLoginResult? _gameLogin;
+  String? _cookies;
+
+  LoginResult? get loginResult => _loginResult;
+  UserLoginResult? get gameLogin => _gameLogin;
+  String? get cookies => _cookies;
+
+  static String extractQRCode(String qrCodeToken) =>
+      ApiService.extractQRCode(qrCodeToken);
+
+  Future<LoginResult> loginWithQr(String qrCodeToken) async {
+    final result = await _apiService.login(qrCodeToken);
+    if (result.success) {
+      _loginResult = result;
+      notifyListeners();
+    }
+    return result;
+  }
+
+  Future<UserLoginResult> loginGame({
+    required int userId,
+    required String token,
+  }) async {
+    final config = TitleServerConfigHolder().config;
+    if (config == null) {
+      throw const TitleApiException('Title Server 未配置');
+    }
+    // Session cookie comes from the UserLoginApi response itself (empurple).
+    final service = TitleApiService(config);
+    final login = await service.userLoginFull(userId: userId, token: token);
+    updateCookies(service.cookies);
+    _gameLogin = login;
+    notifyListeners();
+    return login;
+  }
+
+  Future<void> logoutGame({
+    required int userId,
+    String? cookies,
+  }) async {
+    final login = _gameLogin;
+    if (login == null) return;
+    final config = TitleServerConfigHolder().config;
+    if (config == null) return;
+
+    final service = TitleApiService(config, cookies: cookies ?? _cookies);
+    try {
+      await service.userLogout(
+        userId: userId,
+        loginDateTime: login.loginDateTime,
+      );
+    } catch (_) {
+      // best-effort
+    }
+    _gameLogin = null;
+    notifyListeners();
+  }
+
+  void setGameLogin(UserLoginResult? login) {
+    _gameLogin = login;
+    notifyListeners();
+  }
+
+  void updateCookies(String? cookies) {
+    if (cookies != null && cookies.isNotEmpty) {
+      _cookies = cookies;
+    }
+  }
+
+  void reset() {
+    _loginResult = null;
+    _gameLogin = null;
+    _cookies = null;
+    notifyListeners();
+  }
+}