Added: login/logout logic, session storage

lib/main.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'services/session_manager.dart';
 import 'screens/home_screen.dart';
 import 'screens/add_screen.dart';
 import 'screens/vehicles_screen.dart';
@@ -7,8 +9,16 @@ import 'screens/user_settings.dart';
 import 'screens/login.dart';
 import 'screens/signup.dart';
 
-void main() {
+void main() async {
-  runApp(FuelStatsApp());
+  WidgetsFlutterBinding.ensureInitialized();
+  await SessionManager().init();
+
+  runApp(
+    ChangeNotifierProvider(
+      create: (_) => SessionManager(),
+      child: FuelStatsApp(),
+    ),
+  );
 }
 
 class FuelStatsApp extends StatelessWidget {
@@ -19,7 +29,6 @@ class FuelStatsApp extends StatelessWidget {
       themeMode: ThemeMode.dark,
       debugShowCheckedModeBanner: false,
       home: MainNavigation(),
-      //home: LoginScreen(),
     );
   }
 }
@@ -33,60 +42,62 @@ class MainNavigation extends StatefulWidget {
 
 class _MainNavigationState extends State<MainNavigation> {
   int _currentIndex = 0;
-  bool loggedIn = false;
+
   bool get isAuthScreen => _currentIndex == 5 || _currentIndex == 6;
 
-  @override
+  Widget get currentTitle {
-  void initState() {
+    switch (_currentIndex) {
-    super.initState();
+      case 0:
-
+        return Text("Fuel Stats");
-    if(loggedIn == false) {
+      case 1:
-      _currentIndex = 5;
+        return Text("Add record");
+      case 2:
+        return Text("Vehicles");
+      case 3:
+        return Text("History");
+      case 4:
+        return Text("Settings");
+      case 5:
+        return Text("Login");
+      case 6:
+        return Text("Sign up");
+      default:
+        return Text("Fuel Stats");
     }
   }
 
-  final List<Widget> titles = [
-    Text("Fuel Stats"),
-    Text("Add record"),
-    Text("Vehicles"),
-    Text("History"),
-  ];
-
-  Widget get currentTitle {
-  switch (_currentIndex) {
-    case 0:
-      return Text("Fuel Stats");
-    case 1:
-      return Text("Add record");
-    case 2:
-      return Text("Vehicles");
-    case 3:
-      return Text("History");
-    case 4:
-      return Text("Settings");
-    case 5:
-      return Text("Login");
-    case 6:
-      return Text("Sign up");
-    default:
-      return Text("Fuel Stats");
-  }
-}
-
   @override
   Widget build(BuildContext context) {
-    List<Widget> screens = [
+    final session = Provider.of<SessionManager>(context);
+
+    // Auto-redirect to login if not logged in and not already on auth screens
+    Future.delayed(Duration(milliseconds: 100), () {
+      if (!session.isLoggedIn && !isAuthScreen) {
+        setState(() => _currentIndex = 5);
+      }
+    });
+
+      final screens = [
       HomeScreen(),
       AddScreen(),
       VehiclesScreen(),
       HistoryScreen(),
-      UserSettingsScreen(),
+      UserSettingsScreen(
+        onLogout: () {
+          setState(() => _currentIndex = 5); // Go to login
+        },
+      ),
       LoginScreen(
         onSwitchToSignup: () {
           WidgetsBinding.instance.addPostFrameCallback((_) {
             setState(() => _currentIndex = 6);
           });
         },
+        onLoginSuccess: () {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            setState(() => _currentIndex = 0); // Go to Home
+          });
+        },
       ),
       SignupScreen(
         onSwitchToLogin: () {
@@ -100,37 +111,45 @@ class _MainNavigationState extends State<MainNavigation> {
     return Scaffold(
       appBar: AppBar(
         title: currentTitle,
-        actions: !isAuthScreen ? [
+        actions: !isAuthScreen
-          IconButton(
+            ? [
-            icon: const Icon(Icons.person),
+                IconButton(
-            tooltip: "User settings",
+                  icon: const Icon(Icons.person),
-            onPressed: () {
+                  tooltip: "User settings",
-              Navigator.push(
+                  onPressed: () {
-                context,
+                    Navigator.push(
-                MaterialPageRoute(builder: (context) => UserSettingsScreen()),
+                      context,
-              );
+                      MaterialPageRoute(
-            },
+                        builder: (context) => UserSettingsScreen(
-          ),
+                          onLogout: () {
-        ] : null,
+                            Navigator.pop(context); // Close settings
+                            setState(() => _currentIndex = 5); // Go to Login
+                          },
+                        ),
+                      ),
+                    );
+                  },
+                ),
+              ]
+            : null,
       ),
       body: screens[_currentIndex],
-      bottomNavigationBar: !isAuthScreen ?
+      bottomNavigationBar: !isAuthScreen
-        BottomNavigationBar(
+          ? BottomNavigationBar(
-          currentIndex: _currentIndex <= 3 ? _currentIndex : 0,
+              currentIndex: _currentIndex <= 3 ? _currentIndex : 0,
-          onTap: (index) => setState(() => _currentIndex = index),
+              onTap: (index) => setState(() => _currentIndex = index),
-          backgroundColor: Colors.grey[900],
+              backgroundColor: Colors.grey[900],
-          selectedItemColor: Colors.white,
+              selectedItemColor: Colors.white,
-          unselectedItemColor: Colors.grey,
+              unselectedItemColor: Colors.grey,
-          items: const [
+              items: const [
-            BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
+                BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
-            BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
+                BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
-            BottomNavigationBarItem(
+                BottomNavigationBarItem(icon: Icon(Icons.directions_car), label: 'Vehicles'),
-              icon: Icon(Icons.directions_car),
+                BottomNavigationBarItem(icon: Icon(Icons.history), label: 'History'),
-              label: 'Vehicles',
+              ],
-            ),
+            )
-            BottomNavigationBarItem(icon: Icon(Icons.history), label: 'History'),
+          : null,
-          ],
-        ) : null,
     );
   }
 }
+

lib/screens/login.dart

@@ -1,9 +1,16 @@
 import 'package:flutter/material.dart';
-import 'signup.dart';
+import 'package:provider/provider.dart';
+import '../services/session_manager.dart';
 
 class LoginScreen extends StatefulWidget {
   final VoidCallback onSwitchToSignup;
-  const LoginScreen({required this.onSwitchToSignup, super.key});
+  final VoidCallback onLoginSuccess; // ✅ ADD THIS
+
+  const LoginScreen({
+    required this.onSwitchToSignup,
+    required this.onLoginSuccess, // ✅ ADD THIS
+    super.key,
+  });
 
   @override
   State<LoginScreen> createState() => _LoginScreenState();
@@ -18,10 +25,18 @@ class _LoginScreenState extends State<LoginScreen> {
     if (_formKey.currentState!.validate()) {
       final email = _emailController.text;
       final password = _passwordController.text;
-      // TODO: Replace with actual login logic
-      print('Logging in with $email and $password');
-      if(email == "test@test.com" && password == "Test1234") {
 
+      if (email == "test@test.com" && password == "Test1234") {
+        Provider.of<SessionManager>(context, listen: false).login(
+          token: "dummy_token",
+          email: email,
+          name: "John Doe",
+        );
+        widget.onLoginSuccess(); // ✅ FIXED: now defined
+      } else {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text("Invalid credentials")),
+        );
       }
     }
   }
@@ -29,7 +44,6 @@ class _LoginScreenState extends State<LoginScreen> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      //appBar: AppBar(title: Text('User Login')),
       body: Padding(
         padding: const EdgeInsets.all(24.0),
         child: Form(

lib/screens/user_settings.dart

@@ -1,30 +1,41 @@
 import 'package:flutter/material.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 
+import 'package:flutter/material.dart';
+import 'package:package_info_plus/package_info_plus.dart';
+import 'package:provider/provider.dart';
+import '../services/session_manager.dart';
+
 class UserSettingsScreen extends StatelessWidget {
+  final VoidCallback onLogout;
+
+  const UserSettingsScreen({required this.onLogout, super.key});
+
   Future<String> _getVersion() async {
     final info = await PackageInfo.fromPlatform();
-    //return 'Version: ${info.version}+${info.buildNumber}';
     return 'Version: ${info.version}';
   }
 
   @override
   Widget build(BuildContext context) {
+    final session = Provider.of<SessionManager>(context);
+    final userName = session.name ?? "Unknown User"; // fallback just in case
+
     return Scaffold(
       appBar: AppBar(title: Text('User settings')),
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,
           children: [
-            const Text(
+            Text(
-              "Test User",
+              userName,
               style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold),
             ),
-
             SizedBox(height: 20),
             ElevatedButton.icon(
-              onPressed: () {
+              onPressed: () async {
-                // TODO: Add sign-out logic here
+                await session.logout();
+                onLogout();
               },
               icon: Icon(Icons.logout),
               label: Text("Sign Out"),
@@ -53,3 +64,4 @@ class UserSettingsScreen extends StatelessWidget {
     );
   }
 }
+

lib/services/session_manager.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class SessionManager extends ChangeNotifier {
+  static final SessionManager _instance = SessionManager._internal();
+  factory SessionManager() => _instance;
+  SessionManager._internal();
+
+  bool _loggedIn = false;
+  String? _token;
+  String? _email;
+  String? _name;
+
+  bool get isLoggedIn => _loggedIn;
+  String? get token => _token;
+  String? get email => _email;
+  String? get name => _name;
+
+  final _prefs = SharedPreferencesAsync(); // ✅ New API
+
+  Future<void> init() async {
+    _token = await _prefs.getString('token');
+    _email = await _prefs.getString('email');
+    _name = await _prefs.getString('name');
+
+    _loggedIn = _token != null;
+    notifyListeners();
+  }
+
+  Future<void> login({
+    required String token,
+    required String email,
+    String? name,
+  }) async {
+    await _prefs.setString('token', token);
+    await _prefs.setString('email', email);
+    if (name != null) await _prefs.setString('name', name);
+
+    _token = token;
+    _email = email;
+    _name = name;
+    _loggedIn = true;
+    notifyListeners();
+  }
+
+  Future<void> logout() async {
+    await _prefs.remove('token');
+    await _prefs.remove('email');
+    await _prefs.remove('name');
+
+    _token = null;
+    _email = null;
+    _name = null;
+    _loggedIn = false;
+    notifyListeners();
+  }
+}
+

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -6,7 +6,9 @@ import FlutterMacOS
 import Foundation
 
 import package_info_plus
+import shared_preferences_foundation
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FPPPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FPPPackageInfoPlusPlugin"))
+  SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
 }

pubspec.lock

@@ -65,6 +65,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -160,6 +168,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.16.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   package_info_plus:
     dependency: "direct main"
     description:
@@ -184,6 +200,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      sha256: f7a1fe3a634fe7734c8d3f2766ad746ae2a2884abe22e241a8b301bf5cac3279
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.1"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      sha256: "88f5779f72ba699763fa3a3b06aa4bf6de76c8e5de842cf6f29e2e06476c2334"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      sha256: bd6f00dbd873bfb70d0761682da2b3a2c2fccc2b9e84c495821639601d81afe7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.6"
   plugin_platform_interface:
     dependency: transitive
     description:
@@ -192,6 +240,70 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.8"
+  provider:
+    dependency: "direct main"
+    description:
+      name: provider
+      sha256: "4abbd070a04e9ddc287673bf5a030c7ca8b685ff70218720abab8b092f53dd84"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.5"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      sha256: "6e8bf70b7fef813df4e9a36f658ac46d107db4b4cfe1048b477d4e453a8159f5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.3"
+  shared_preferences_android:
+    dependency: transitive
+    description:
+      name: shared_preferences_android
+      sha256: "20cbd561f743a342c76c151d6ddb93a9ce6005751e7aa458baad3858bfbfb6ac"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.10"
+  shared_preferences_foundation:
+    dependency: transitive
+    description:
+      name: shared_preferences_foundation
+      sha256: "6a52cfcdaeac77cad8c97b539ff688ccfc458c007b4db12be584fbe5c0e49e03"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.4"
+  shared_preferences_linux:
+    dependency: transitive
+    description:
+      name: shared_preferences_linux
+      sha256: "580abfd40f415611503cae30adf626e6656dfb2f0cee8f465ece7b6defb40f2f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  shared_preferences_platform_interface:
+    dependency: transitive
+    description:
+      name: shared_preferences_platform_interface
+      sha256: "57cbf196c486bc2cf1f02b85784932c6094376284b3ad5779d1b1c6c6a816b80"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  shared_preferences_web:
+    dependency: transitive
+    description:
+      name: shared_preferences_web
+      sha256: c49bd060261c9a3f0ff445892695d6212ff603ef3115edbb448509d407600019
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.3"
+  shared_preferences_windows:
+    dependency: transitive
+    description:
+      name: shared_preferences_windows
+      sha256: "94ef0f72b2d71bc3e700e025db3710911bd51a71cefb65cc609dd0d9a982e3c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -285,6 +397,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.12.0"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      sha256: "7a3f37b05d989967cdddcbb571f1ea834867ae2faa29725fd085180e0883aa15"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
 sdks:
   dart: ">=3.7.2 <4.0.0"
-  flutter: ">=3.19.0"
+  flutter: ">=3.27.0"

pubspec.yaml

@@ -30,6 +30,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  shared_preferences: ^2.5.3
+  provider: ^6.1.5
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.