import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';

declare let gapi: any;
@Injectable({
  providedIn: 'root'
})

export class GoogleServiceService {

  constructor() {
    gapi.load('client:auth2', () => this.initClient());
  }

  isSignedInSubject: Subject<any> = new Subject<any>();
  isSignedIn = this.isSignedInSubject.asObservable();

  API_KEY = "AIzaSyDT8J0B7L4paTekOAQlergeVHzpxyeflrs";
  CLIENT_ID = "888009890047-g411qo3g52g3c5ackk5oiikses3sb4kl.apps.googleusercontent.com";
  DISCOVERY_DOCS = ["https://www.googleapis.com/discovery/v1/apis/tasks/v1/rest"];
  SCOPES = "https://www.googleapis.com/auth/tasks.readonly";


  Authenticate()
  {
    gapi.auth2.getAuthInstance().signIn();
    console.log("Authentication handled")
  }

  Logout()
  {
    gapi.auth2.getAuthInstance().signOut();
    console.log("logout handled");
  }

  initClient() {
    gapi.client.init({
      apiKey: this.API_KEY,
      clientId: this.CLIENT_ID,
      discoveryDocs: this.DISCOVERY_DOCS,
      scope: this.SCOPES
    }).then(function () {
      gapi.auth2.getAuthInstance().isSignedIn.listen(updateSigininStatus);
      updateSigininStatus(gapi.auth2.getAuthInstance().isSignedIn.get());
    });
    console.log("Client initiated");
  }

    updateSigininStatus(isSignedIn): void {
      if (isSignedIn) {
        console.log("signed in");
      } else {
        console.log("not signed in");
      }
    this.isSignedIn = isSignedIn;
  }

}