app.get('/authenticate', function(req, res) {
  linkedin.people.me(['id', 'first-name', 'last-name', 'email-address', 'positions', 'picture-url::(original)', 'industry', 'headline'], function(err, $in) {
    if ( err )
      return console.log(err);

    req.session.linkedinID: linkedinID;

    var linkedInUser = {
      currentPosition: $in.positions.values[0].company.name,
      linkedinID: $in.id,
      firstname: $in.firstName,
      lastname: $in.lastName,
      email: $in.emailAddress,
      pictureURL: $in.pictureUrl
    }

    // for a user with the same id as the recID
    User.findOne({ 'linkedIn.linkedinID' : linkedinID}, function(err, user) {
        if (err)
            return (err);
        // if the user is found, then log them in
        if (user) {
            req.session.user = user;
            // find recruiter with the same id
            Recruiter.findById(user._id, function(err, recruiter) {
              if (err) throw err;
              // associating reviews
              user.reviews = recruiter.reviews;
              // save the user
              user.save(function(err) {
                if (err) throw err;
              });
            });
            return res.redirect('/authenticated-profile/' + user._id); // user found, return that user

        } else {

          var recruiterID = req.session.recruiter_id;
          var ratings = [];
          // Create new user and associate with recruiter
          Recruiter.findByIdAndUpdate(
            recruiterID,
            {$push: {pictureURL: pictureURL}},
            {safe: true, upsert: true, new : true},
            function(err, recruiter) {
              if (err) throw err;

              ratings = recruiter.reviews;
              var newUser            = new User();
              newUser = {
                linkedIn: {
                  _id: recruiterID,
                  currentPosition: linkedInUser.currentPosition,
                  linkedinID: linkedInUser.linkedinID,
                  linkedinToken: req.session.token,
                  firstname: linkedInUser.firstname,
                  lastname: linkedInUser.lastname,
                  emailAddress: linkedInUser.emailAddress,
                  pictureURL: linkedInUser.pictureURL,
                  reviews: ratings
                }
              }

              // saving user to the database
              newUser.save(function(err) {
                if (err)
                    throw err;
                req.flash('successMessage', 'authenticated');
                // if successful, return the new user
                req.session.user = newUser;
                return res.redirect('/authenticated-profile/' + newUser._id);
              });
          });
        }
    });
  });
});