firebase_user.id

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:shop_app_mobb/pages/home.dart';

class login extends StatefulWidget {
  const login({Key? key}) : super(key: key);

  @override
  _loginState createState() => _loginState();
}

class _loginState extends State<login> {
  final googlesignin = GoogleSignIn();
  final firebaseauth = FirebaseAuth.instance;
  late SharedPreferences preferences;
  bool loading = false;
  bool islogedin = false;

  @override
  void initState() {
    super.initState();
    issignedin();
  }

  void issignedin() async {
    setState(() {
      loading = true;
    });
    preferences = await SharedPreferences.getInstance();
    islogedin = await googlesignin.isSignedIn();
    if (islogedin) {
      Navigator.pushReplacement(
          context, MaterialPageRoute(builder: (context) => Homepage()));
    }
    setState(() {
      loading = false;
    });
  }

  Future handlesignin() async {
    preferences = await SharedPreferences.getInstance();
    setState(() async {
      loading = true;
      GoogleSignInAccount? googleuser = await googlesignin.signIn();
      GoogleSignInAuthentication googleSignInAuthentication =
      await googleuser!.authentication;
      final AuthCredential credential = GoogleAuthProvider.credential(
        accessToken: googleSignInAuthentication.accessToken,
        idToken: googleSignInAuthentication.idToken,
      );
      final User firebaseuser =
      (await firebaseauth.signInWithCredential(credential)) as User;
      if (firebaseuser != null) {
        final QuerySnapshot result = (await FirebaseFirestore.instance
            .collection("users")
            .where("id", isEqualTo: firebaseuser.uid))
        as QuerySnapshot<Object?>;
        final List<DocumentSnapshot> documents =
        result as List<DocumentSnapshot<Object?>>;
        // if (documents.length == 0) {
        //   FirebaseFirestore.instance.collection("users").doc(User.uid).set({
        //     "id": User.uid,
        //     "username": User.displayName,
        //     "profilepicture": User.photoURL
        //   });
        FirebaseFirestore.instance.collection("users").add({
          "id": User.uid,
          "username": User.displayName,
          "profilepicture": User.photoURL
        });
      }
    }
        }

  );
}

@override
Widget build(BuildContext context) {
  return Container();
}}