handle login status

lib/screens/auth/onboarding_page.dart

@@ -1,12 +1,14 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import '../../extension/screenSize.dart';
 import '../../gen/assets.gen.dart';
 import '../../res/colors.dart';
-import 'login_page.dart';
 
 class OnboardingPage extends StatefulWidget {
-  const OnboardingPage({super.key});
+  final VoidCallback? onCompleted;
+  
+  const OnboardingPage({super.key, this.onCompleted});
 
   @override
   State<OnboardingPage> createState() => _OnboardingPageState();
@@ -28,17 +30,23 @@ class _OnboardingPageState extends State<OnboardingPage> {
     Assets.icons.slide3.path,
   ];
 
-  void _next() {
+  void _next() async {
     if (currentIndex < imageAssets.length - 1) {
       _pageController.nextPage(
         duration: Duration(milliseconds: 300),
         curve: Curves.easeInOut,
       );
     } else {
-      Navigator.push(
-        context,
-        MaterialPageRoute(builder: (context) => LoginPage()),
-      );
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setBool('first_time_user', false);
+      
+      if (mounted) {
+        if (widget.onCompleted != null) {
+          widget.onCompleted!();
+        } else {
+          Navigator.pop(context);
+        }
+      }
     }
   }
 

lib/simple_auth_gate.dart

@@ -3,51 +3,72 @@ import 'package:flutter/material.dart';
 import 'package:lba/screens/auth/login_page.dart';
 import 'package:lba/screens/auth/onboarding_page.dart';
 import 'package:lba/screens/mains/navigation/navigation.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
-class SimpleAuthGate extends StatelessWidget {
+class SimpleAuthGate extends StatefulWidget {
   const SimpleAuthGate({super.key});
 
   @override
-  Widget build(BuildContext context) {
-    return StreamBuilder<User?>(
-      stream: FirebaseAuth.instance.authStateChanges(),
-      builder: (context, snapshot) {
-        if (snapshot.connectionState == ConnectionState.waiting) {
-          return const Scaffold(
-            body: Center(
-              child: CircularProgressIndicator(),
-            ),
-          );
-        }
+  State<SimpleAuthGate> createState() => _SimpleAuthGateState();
+}
 
-        if (snapshot.hasError) {
-          return const Scaffold(
-            body: Center(
-              child: Column(
-                mainAxisAlignment: MainAxisAlignment.center,
-                children: [
-                  Icon(Icons.error, size: 64, color: Colors.red),
-                  SizedBox(height: 16),
-                  Text('An error occurred. Please try again later.'),
-                ],
-              ),
-            ),
-          );
-        }
+class _SimpleAuthGateState extends State<SimpleAuthGate> {
+  bool _isLoading = true;
+  Widget? _targetScreen;
 
-        final user = snapshot.data;
-        final isLoggedIn = user != null;
-
-        if (isLoggedIn) {
-          return const MainScreen();
-        }
-
-        return _shouldShowOnboarding() ? const OnboardingPage() : const LoginPage();
-      },
-    );
+  @override
+  void initState() {
+    super.initState();
+    _determineInitialScreen();
   }
 
-  bool _shouldShowOnboarding() {
-    return false;
+  Future<void> _determineInitialScreen() async {
+    final user = FirebaseAuth.instance.currentUser;
+    final isLoggedIn = user != null;
+
+    if (isLoggedIn) {
+      _setTargetScreen(const MainScreen());
+      return;
+    }
+
+    final prefs = await SharedPreferences.getInstance();
+    final isFirstTime = prefs.getBool('first_time_user') ?? true;
+
+    if (isFirstTime) {
+      _setTargetScreen(OnboardingPage(
+        onCompleted: () {
+          _setTargetScreen(const LoginPage());
+        },
+      ));
+    } else {
+      _setTargetScreen(const LoginPage());
+    }
+  }
+
+  void _setTargetScreen(Widget screen) {
+    if (mounted) {
+      setState(() {
+        _targetScreen = screen;
+        _isLoading = false;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_isLoading || _targetScreen == null) {
+      return const Scaffold(
+        body: Center(
+          child: CircularProgressIndicator(),
+        ),
+      );
+    }
+
+    return _targetScreen!;
+  }
+
+  static Future<void> resetOnboarding() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('first_time_user', true);
   }
 }