PhysiGo/app/lib/main.dart

import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:physigo/Services/AuthService.dart';
import 'package:physigo/Services/logged_in_user.dart';

import 'firebase_options.dart';
import 'push_notifications_initializer.dart';
import 'package:physigo/logIn.dart';
import 'package:physigo/profilePage.dart';
import 'package:physigo/widgets/rankingNavigation.dart';
import 'package:physigo/SignupPage.dart';
import 'package:physigo/menu/main_page.dart';
import 'package:physigo/welcomeScreen.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  handleMessages();

  runApp(const PhysiGo());
}

class PhysiGo extends StatelessWidget {
  const PhysiGo({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return FutureBuilder<LoggedInUser?>(
        future: AuthenticationServices.getCurrentUser(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }
          return MaterialApp(
            title: 'PhysiGo',
            theme: ThemeData(
              primarySwatch: Colors.blueGrey,
            ),
            initialRoute: snapshot.hasData ? '/mainPage' : "/",
            routes: {
              '/': (context) => MyHomePage(title: ''),
              '/register': (context) => SignupPage(),
              //'/register2': (context) => RegisterScreen2(title: ''),
              //'/register3': (context) => RegisterScreen3(title: ''),
              '/login': (context) => LogIn(title: ''),
              '/profilePage': (context) => ProfilePage(title: ''),
              '/mainPage': (context) => MainPage()
            },
            //home: const MyHomePage(title: 'Flutter Demo Home Page'),
          );
        });
  }
}