auth.dart

import 'package:firebase_auth/firebase_auth.dart' as auth;
import 'package:google_sign_in/google_sign_in.dart';
import 'package:rxdart/rxdart.dart';
import 'package:tiger_tracker_v2/database.dart';
import 'package:tiger_tracker_v2/user.dart';

class AuthService {
  final GoogleSignIn _googleSignIn = GoogleSignIn();
  final auth.FirebaseAuth _auth = auth.FirebaseAuth.instance;

  //Stream<FirebaseUser> user;
  Stream<Map<String, dynamic>> profile;
  PublishSubject loading = PublishSubject();

  // create user obj based on FirebaseUser
  User _userFromFirebaseUser(auth.User user) {
    return user != null ? User(uid: user.uid) : null;
  }

  //auth change user stream
  Stream<User> get user {
    return _auth.authStateChanges().map(_userFromFirebaseUser);
  }

  // register with Email and Password
  Future registerWithEmailAndPassword(String _email, String _password) async {
    try {
      auth.UserCredential result = await _auth.createUserWithEmailAndPassword(
          email: _email, password: _password);
      auth.User user = result.user;

      //create a new document for the user with the uid
      await DatabaseService(uid: user.uid)
          .updateUserData('0', 'New Username', _email, user.uid);

      return _userFromFirebaseUser(user);
    } catch (e) {
      print(e.toString());
      return null;
    }
  }

  //sign in with email and password
  Future signInWithEmailAndPassword(String _email, String _password) async {
    try {
      auth.UserCredential result = await _auth.signInWithEmailAndPassword(
          email: _email, password: _password);
      auth.User user = result.user;
      return _userFromFirebaseUser(user);
    } catch (e) {
      print(e.toString());
      return null;
    }
  }

  //sign in with google
  Future googleSignIn() async {
    try {
      final GoogleSignInAccount googleUser = await _googleSignIn.signIn();

      final GoogleSignInAuthentication googleAuth =
          await googleUser.authentication;

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

      auth.UserCredential result = await _auth.signInWithCredential(credential);
    } catch (e) {
      print(e.toString());
      return null;
    }
  }

  //sign out logic
  Future signOut() async {
    try {
      return await _auth.signOut();
    } catch (e) {
      print(e.toString());
      return null;
    }
  }
}