module Workarea
  module Storefront
    module HttpCaching
      extend ActiveSupport::Concern

      included do
        after_action :set_vary_headers
        helper_method :http_caching?
      end

      def cache_page
        unless current_user.try(:admin?)
          expires_in Workarea.config.cache_expirations.http_cache, public: true if flash.blank?
          request.session_options[:skip] = true
          @http_caching = true
        end
      end

      def http_caching?
        !!@http_caching
      end

      private

      def set_vary_headers
        response.headers['X-Requested-With'] = request.headers['X-Requested-With'] || ''
        response.headers['X-Flash-Messages'] ||= ''

        response.headers['Vary'] = 'X-Requested-With, X-Flash-Messages'
      end
    end
  end
end