import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';

class Authentication with ChangeNotifier {
  final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
  final GoogleSignIn _googleSignIn = GoogleSignIn();

  String? uid;
  String? get getUsetUid => uid;

  Future userState() async {
    FirebaseAuth.instance.authStateChanges().listen(
      (User? user) {
        print(user);

        if (user == null) {
          print('User is currently signed out!');
          // return false;
        } else {
          print('User is signed in!');
          // return true;
        }
        // return user;
      },
    );
  }

  Future signInWIthGoogle() async {
    final GoogleSignInAccount? _googleSignInAccount = await _googleSignIn.signIn();

    if (_googleSignInAccount != null) {
      final GoogleSignInAuthentication? _googleSignInAuthentication = await _googleSignInAccount.authentication;

      // final AuthCredential authCredential = FirebaseAuth.insta

      final AuthCredential _authCredential = GoogleAuthProvider.credential(
        accessToken: _googleSignInAuthentication!.accessToken,
        idToken: _googleSignInAuthentication.idToken,
      );

      // AuthResult result = await auth.signInWithCredential(_authCredential);

      final UserCredential? _userCredential = await _firebaseAuth.signInWithCredential(_authCredential);

      // FirebaseUser user = await auth.currentUser();

      final User? _user = _userCredential!.user;
      uid = _user!.uid;
      print(_user);
      print('Google User Uid => $uid');
      notifyListeners();
      return Future.value(true);
    }
  }

  void signOutWithGoogle() async {
    User? user;
    print(user);
    await _googleSignIn.disconnect();
    await GoogleSignIn().signOut();
    await FirebaseAuth.instance.signOut();

    _googleSignIn.signOut();
    return _firebaseAuth.signOut();
  }
}

import 'package:battle_line/routes/route_builder.dart';
import 'package:battle_line/services/authentication.dart';
import 'package:battle_line/views/screen/splash_screen.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:provider/single_child_widget.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(
    MultiProvider(
      providers: providers,
      child: MyApp(),
    ),
  );
}

List<SingleChildWidget> providers = [
  ChangeNotifierProvider<Authentication>(create: (_) => Authentication()),
];

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final _authenticationP = Provider.of<Authentication>(context, listen: false);
    print(_authenticationP.userState());
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        fontFamily: 'Roboto',
        brightness: Brightness.dark,
        primarySwatch: Colors.blue,
      ),
      home: MySplashScreen(),
      onGenerateRoute: RouteBuilder.generateRoute,
    );
  }
}


// Application Just Run
Launching lib\main.dart on vivo 1610 in debug mode...
lib\main.dart:1
Parameter format not correct -
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:58299/ktuGVe5GbSc=/ws
I/flutter (18434): Instance of 'Future<dynamic>'
I/flutter (18434): null
I/flutter (18434): User is currently signed out!

// Just Sign in with google
D/PhoneWindow(18434): DEBUG_SYSTEMUI:origin statusbar style
D/PhoneWindow(18434): DEBUG_SYSTEMUI:IconColor=1
D/PhoneWindow(18434): DEBUG_SYSTEMUI:StatusBarColor final set ff000000
2
W/System  (18434): Ignoring header X-Firebase-Locale because its value was null.
D/FirebaseAuth(18434): Notifying id token listeners about user ( XUxmvIqc9mM7wIlcaDFbPBfWhbz1 ).
D/FirebaseAuth(18434): Notifying auth state listeners about user ( XUxmvIqc9mM7wIlcaDFbPBfWhbz1 ).
I/flutter (18434): User(displayName: Kevin Rebort, email: kevinrebort@gmail.com, emailVerified: true, isAnonymous: false, metadata: UserMetadata(creationTime: 2021-04-24 15:52:45.818, lastSignInTime: 2021-04-25 15:35:21.910), phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerData, [UserInfo(displayName: Kevin Rebort, email: [email protected], phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerId: google.com, uid: 100989913149925301834)], refreshToken: , tenantId: null, uid: XUxmvIqc9mM7wIlcaDFbPBfWhbz1)
I/flutter (18434): User is signed in!
I/flutter (18434): User(displayName: Kevin Rebort, email: kevinrebort@gmail.com, emailVerified: true, isAnonymous: false, metadata: UserMetadata(creationTime: 2021-04-24 15:52:45.818, lastSignInTime: 2021-04-25 15:35:21.910), phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerData, [UserInfo(displayName: Kevin Rebort, email: [email protected], phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerId: google.com, uid: 100989913149925301834)], refreshToken: , tenantId: null, uid: XUxmvIqc9mM7wIlcaDFbPBfWhbz1)
I/flutter (18434): Google User Uid => XUxmvIqc9mM7wIlcaDFbPBfWhbz1

// User Log Out
W/System  (18434): Ignoring header X-Firebase-Locale because its value was null.
D/FirebaseAuth(18434): Notifying id token listeners about user ( XUxmvIqc9mM7wIlcaDFbPBfWhbz1 ).
I/flutter (18434): User(displayName: Kevin Rebort, email: kevinrebort@gmail.com, emailVerified: true, isAnonymous: false, metadata: UserMetadata(creationTime: 2021-04-24 15:52:45.818, lastSignInTime: 2021-04-25 15:38:44.827), phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerData, [UserInfo(displayName: Kevin Rebort, email: [email protected], phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerId: google.com, uid: 100989913149925301834)], refreshToken: , tenantId: null, uid: XUxmvIqc9mM7wIlcaDFbPBfWhbz1)
I/flutter (18434): Google User Uid => XUxmvIqc9mM7wIlcaDFbPBfWhbz1

// Hot Restart With out sign in and user still sign in
Restarted application in 3,259ms.
W/DynamiteModule(18434): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(18434): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(18434): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
V/NativeCrypto(18434): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 287 native methods...
2
I/art     (18434): Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java7ExtendedSSLSession>
2
I/art     (18434): Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java8ExtendedSSLSession>
I/ProviderInstaller(18434): Installed default security provider GmsCore_OpenSSL
I/flutter (18434): Instance of 'Future<dynamic>'
I/flutter (18434): User(displayName: Kevin Rebort, email: [email protected], emailVerified: true, isAnonymous: false, metadata: UserMetadata(creationTime: 2021-04-24 15:52:45.818, lastSignInTime: 2021-04-25 15:35:21.910), phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerData, [UserInfo(displayName: Kevin Rebort, email: [email protected], phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerId: google.com, uid: 100989913149925301834)], refreshToken: , tenantId: null, uid: XUxmvIqc9mM7wIlcaDFbPBfWhbz1)
I/flutter (18434): User is signed in!
I/flutter (18434): User(displayName: Kevin Rebort, email: [email protected], emailVerified: true, isAnonymous: false, metadata: UserMetadata(creationTime: 2021-04-24 15:52:45.818, lastSignInTime: 2021-04-25 15:35:21.910), phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerData, [UserInfo(displayName: Kevin Rebort, email: [email protected], phoneNumber: null, photoURL: https://lh3.googleusercontent.com/-d7EiGOHconA/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnKZFSaegdVWEM7FDPvMdm8p-NvZw/s96-c/photo.jpg, providerId: google.com, uid: 100989913149925301834)], refreshToken: , tenantId: null, uid: XUxmvIqc9mM7wIlcaDFbPBfWhbz1)
I/flutter (18434): User is signed in!