mlomnicki/ddd-ecommerce

module Sales
  module Application
    class OrderApplicationService
      UnknownProduct = Class.new(StandardError)

      def initialize(order_repository, product_repository)
        @order_repository   = order_repository
        @product_repository = product_repository
      end

      def add_item_to_order(command)
        product = product_repository.load(command.product_id)

        if product.nil?
          raise UnknownProduct, "Unknown product with ID: #{command.product_id}"
        end

        order_repository.store(command.order_id) do |order|
          order.add_item(product.id, product.price)
        end
      end

      def place_order(command)
        order_repository.store(command.order_id) do |order|
          order.place(command.customer_id)
        end
      end

      def expire_order(command)
        order_repository.store(command.order_id) do |order|
          order.expire
        end
      end

      def complete_order(command)
        order_repository.store(command.order_id) do |order|
          order.complete
        end
      end

      def cancel_order(command)
        order_repository.store(command.order_id) do |order|
          order.cancel(command.reason)
        end
      end

      private

      attr_reader :order_repository, :product_repository
    end
  end
end