fix: only import requires modules

  Injectable,

  Inject

} from '@angular/core';

import firebase from 'firebase';

import firebase from 'firebase/app';

import GoogleAuthProvider = firebase.auth.GoogleAuthProvider;

import GithubAuthProvider = firebase.auth.GithubAuthProvider;

import FacebookAuthProvider = firebase.auth.FacebookAuthProvider;

import TwitterAuthProvider = firebase.auth.TwitterAuthProvider;

@Injectable()

export class IdentityPlatformService {

  }

  public google(popup: boolean = true): Promise<boolean> {

    const provider = new GoogleAuthProvider();

    return this.withProvider(new GoogleAuthProvider(), popup);

  }

  public github(popup: boolean = true): Promise<boolean> {

    return this.withProvider(new GithubAuthProvider(), popup);

  }

  public facebook(popup: boolean = true): Promise<boolean> {

    return this.withProvider(new FacebookAuthProvider(), popup);

  }

  public twitter(popup: boolean = true): Promise<boolean> {

    return this.withProvider(new TwitterAuthProvider(), popup);

  }

  protected withProvider(provider: firebase.auth.AuthProvider, popup: boolean = true) {

    const signIn: Promise<any> = popup ? this.fireAuth.signInWithPopup(provider) : this.fireAuth.signInWithRedirect(provider);

    return signIn.then(() => true).catch(() => false).then(status => {

      this.isAuthenticated$.next(status);