module MWS
  module Orders
    module Helper
      class StructuredList
        KEYS = {
          order_status:        %w(OrderStatus Status),
          marketplace_id:      %w(MarketplaceId Id),
          fulfillment_channel: %w(FulfillmentChannel Channel),
          payment_method:      %w(PaymentMethod),
          tfm_shipment_status: %w(TFMShipmentStatus Status),
          amazon_order_id:     %w(AmazonOrderId Id)
        }

        attr :keys

        def self.handle?(key)
          KEYS.has_key?(key)
        end

        def initialize(key)
          @keys = KEYS.fetch(key)
        end

        def build(values)
          Array(values)
            .each_with_index
            .reduce(Hash.new) { |hsh, (v, i)|
              hsh.merge(composite_key(i + 1) => v)
            }
        end

        private

        def composite_key(index)
          (keys.dup << index).join('.')
        end
      end
    end
  end
end