auth_util.dart

Future<User> signInOrCreateAccount(
    BuildContext context, Future<UserCredential> Function() signInFunc) async {
  try {
    final userCredential = await signInFunc();
    await maybeCreateUser(userCredential.user);
    return userCredential.user;
  } on FirebaseAuthException catch (e) {
    ScaffoldMessenger.of(context).hideCurrentSnackBar();
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('Error: ${e.message}')),
    );
    return null;
  }
}