mynotes/lib/main.dart

import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:mynotes/constants/routes.dart';
import 'package:mynotes/firebase_options.dart';
import 'package:mynotes/views/login_view.dart';
import 'package:mynotes/views/register_view.dart';
import 'package:mynotes/views/verify_email_view.dart';
import 'dart:developer' as devtools show log;

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(
    MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const HomePage(),
      routes: {
        loginRoute: (context) => const LoginView(),
        registerRoute: (context) => const RegisterView(),
        notesRoute: (context) => const NotesView(),
        verifyEmailRoute: (context) => const VerifyEmailView(),
      },
    ),
  );
}

class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: Firebase.initializeApp(
        options: DefaultFirebaseOptions.currentPlatform,
      ),
      builder: (context, snapshot) {
        switch (snapshot.connectionState) {
          case ConnectionState.done:
            final user = FirebaseAuth.instance.currentUser;
            if (user != null) {
              if (user.emailVerified) {
                return const NotesView();
              } else {
                return const VerifyEmailView();
              }
            } else {
              return const LoginView();
            }

          default:
            return const Scaffold(
              body: Center(
                child: CircularProgressIndicator(),
              ),
            );
        }
      },
    );
  }
}

enum MenuAction { logout }

class NotesView extends StatefulWidget {
  const NotesView({super.key});

  @override
  State<NotesView> createState() => _NotesViewState();
}

class _NotesViewState extends State<NotesView> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Main UI', style: TextStyle(color: Colors.white)),
        backgroundColor: Colors.blue,
        actions: [
          // Add the 'actions' named parameter here
          PopupMenuButton<MenuAction>(
              icon: const Icon(Icons.more_vert, color: Colors.white),
              onSelected: (value) async {
                switch (value) {
                  case MenuAction.logout:
                    final shouldLogout = await showLogOutDialog(context);
                    devtools.log('shouldLogout: $shouldLogout');
                    if (shouldLogout) {
                      await FirebaseAuth.instance.signOut();
                      // ignore: use_build_context_synchronously
                      Navigator.of(context).pushNamedAndRemoveUntil(
                        loginRoute,
                        (route) => false,
                      );
                    }
                }
              },
              itemBuilder: (context) {
                return const [
                  PopupMenuItem<MenuAction>(
                    value: MenuAction.logout,
                    child: Text('Logout'),
                  )
                ];
              })
        ],
      ),
      body: const Center(
        child: Text('Welcome to the main UI'),
      ),
    );
  }
}

Future<bool> showLogOutDialog(BuildContext context) {
  return showDialog<bool>(
    context: context,
    builder: (context) {
      return AlertDialog(
        title: const Text('Sign Out'),
        content: const Text('Are you sure you want to sign out?'),
        actions: [
          TextButton(
            onPressed: () {
              // Navigator.pop(context, false); NOT recommended method
              Navigator.of(context).pop(false); // recommended method
            },
            child: const Text('Cancel'),
          ),
          TextButton(
            onPressed: () {
              Navigator.of(context).pop(true);
            },
            child: const Text('Logout'),
          )
        ],
      );
    },
  ).then((value) => value ?? false);
}