import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { AngularFireAuth } from 'angularfire2/auth';
import { AngularFireDatabase } from 'angularfire2/database';
import * as firebase from 'firebase/app';
import { Observable } from 'rxjs/Observable';

@Injectable({
  providedIn: 'root'
})
export class AuthService {
  private user: Observable<firebase.User>;
  private authState: any;
  userId: string;
  signupAttempt: number;
  userDetails: any;

  constructor(private afAuth: AngularFireAuth,
    private db: AngularFireDatabase,
    private router: Router) {
      this.user = afAuth.authState;
    }

  authenticateUser() {
    return this.user;
  }

  getUserDetails(uid: string) {
    const path = `users/${uid}`;
    return this.db.object(path);
  }

  login(email: string, password: string) {
    return this.afAuth.auth.signInWithEmailAndPassword(email, password)
      .then((user) => {
        this.authState = user;
        this.signupAttempt = 1;
        this.setUserSatus('online');
        this.getUserDetails(user.uid);
        this.router.navigate(['chat']);
        window.location.reload();
    });
  }

  get currentUserId(): string {
    if (this.signupAttempt === 1) {
      this.signupAttempt = 0;
      return this.authState !== null ? this.authState.uid : ' ';
    } else {
      this.userId = sessionStorage.getItem('userId');
      return this.authState !== null ? this.userId : this.authState.uid;
    }
  }

  setUserSatus(status: string) {
    const path = `users/${this.currentUserId}`;
    const data = {
      status: status
    };
    this.db.object(path).update(data);
  }
}