module Shopper
  module CheckoutPage
    class ProceedCheckout
      def self.call(order, params, step, &block)
        command = case step
                  when :address  then AddCheckoutAddresses
                  when :delivery then AddCheckoutDelivery
                  when :payment  then AddCheckoutPayment
                  end
        ActiveRecord::Base.transaction { command.call(order, params, &block) }
      end
    end
  end
end