cpd_job_app/lib/user_state.dart

import 'package:cpd_ss23/jobs/jobs_screen.dart';
import 'package:cpd_ss23/services/global_methods.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';

import 'login_page/login_screen.dart';

class UserState extends StatelessWidget {
  //  enthält keine internen Variablen, die sich während der Laufzeit ändern können.

  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: FirebaseAuth.instance.authStateChanges(),
      builder: (context, userSnapshot) {
        if (userSnapshot.data == null) {
          print('user isnt logged in yet');
          return Login();
        } else if (userSnapshot.hasData) {
          print('user is already logged in ');
          return JobScreen();
        } else if (userSnapshot.hasError) {
          return const Scaffold(
              body: Center(
            child: Text("An Error ossured"),
          ));
        } else if (userSnapshot.connectionState == ConnectionState.waiting) {
          return const Scaffold(
              body: Center(
            child: CircularProgressIndicator(),
          ));
        }
        return const Scaffold(
            body: Center(
          child: Text("Smt went wrong"),
        ));
      },
    );
  }
}