passport.use(
  new FacebookStrategy(
    {
      clientID: config.facebookAuth.clientID,
      clientSecret: config.facebookAuth.clientSecret,
      callbackURL: config.facebookAuth.callbackURL,
      profileFields: [
        'id',
        'displayName',
        'picture.width(200).height(200)',
        'first_name',
        'middle_name',
        'last_name',
        'email',
      ],
    },
    (accessToken, refreshToken, profile, done) => {
      process.nextTick(async () => {
        const facebookUser = {
          id: Math.random(),
          userName: profile.displayName,
          email: profile.emails[0].value,
          imgUrl: profile.photos[0].value,
          imgHeight: 200,
          imgWidth: 200,
          userProfileId: profile.id,
        };
        await getAsync('usersMockDatabase').then((users) => {
          // save new user into database
          const currUsers = JSON.parse(users);
          currUsers.push(facebookUser);
          db.set('usersMockDatabase', JSON.stringify(currUsers));
        });
        return done(null, facebookUser);
      });
    },
  ),
);