auth.dart

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:realtime_chat/helperfun/sharedpref_helper.dart';
import 'package:realtime_chat/services/database.dart';
import 'package:realtime_chat/views/home.dart';
import 'package:shared_preferences/shared_preferences.dart';

class AuthMethods {
  final FirebaseAuth auth = FirebaseAuth.instance;

  //get current user
  getCurrentUser() async {
    return auth.currentUser;
  }

  Future<User> signInWithGoogle(BuildContext context) async {
    final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
    final GoogleSignIn _googleSignIn = new GoogleSignIn();

    final GoogleSignInAccount googleSignInAccount =
        await _googleSignIn.signIn();

    final GoogleSignInAuthentication googleSignInAuthentication =
        await googleSignInAccount.authentication;

    final AuthCredential credential = GoogleAuthProvider.credential(
        idToken: googleSignInAuthentication.idToken,
        accessToken: googleSignInAuthentication.accessToken);

    UserCredential result =
        await _firebaseAuth.signInWithCredential(credential);
    User userDetails = result.user;

    if (result == null) {
    } else {
      SharedPreferenceHelper().saveUserEmail(userDetails.email);
      SharedPreferenceHelper().saveUserId(userDetails.uid);
      SharedPreferenceHelper()
          .saveUserName(userDetails.email.replaceAll("@gmail.com", ""));
      SharedPreferenceHelper().saveDisplayName(userDetails.displayName);
      SharedPreferenceHelper().saveUserProfileUrl(userDetails.photoURL);

      DatabaseMethods()
          .addUserInfoToDB(
              userID: userDetails.uid,
              email: userDetails.email,
              username: userDetails.email.replaceAll("@gmail.com", ""),
              name: userDetails.displayName,
              profileUrl: userDetails.photoURL)
          .then(() {
        Navigator.pushReplacement(
            context, MaterialPageRoute(builder: (context) => Home()));
      });
    }
  }

  Future signOut() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    prefs.clear();
    await auth.signOut();
  }
}