class AuthenticationsController < ApplicationController

  def create
    omniauth = request.env['omniauth.auth']

    authentication = Authentication.find_by_provider_and_uid(
      omniauth['provider'], omniauth['uid'])

    if authentication
      flash[:notice] = 'Signed in successfully.'

      sign_in_and_redirect(:user, authentication.user)
    elsif current_user
      current_user.authentications.create!(
        :provider => omniauth['provider'], :uid => omniauth['uid'])
      flash[:notice] = "Authentication successful."

      redirect_to authentications_url
    else
      user = User.new
      user.apply_omniauth(omniauth)
      user.save!

      flash[:notice] = 'Signed in successfully.'
      sign_in_and_redirect(:user, user)
    end
  end

end