quantities_with_max_units_and_shipping_package_categories_mapper.rb

module Delivery
  class QuantitiesWithMaxUnitsAndShippingPackageCategoriesMapper
    def initialize(cart_products)
      @cart_products = cart_products
    end

    def quantities_with_max_units_and_shipping_package_categories
      @cart_products.map do |cart_product|
        variant = cart_product.sample_pack_product.presence || cart_product.variant.presence
        raise "Unsupported type! #{cart_product.inspect}" unless variant

        # Even if the variable max_units_per_correos_envelope leads to believe that it's related with the maximum number
        # of units that fit in an envelope, the real meaning is the maximum number of units that fit in its defined
        # shipping_package_category (envelope, box or bag). This naming is misleading and prone to errors when
        # shipping_package_category is changed but not its corresponding max_units_per_correos_envelope.
        # However in the case of UPS we just have ONE type of package (envelope) and the naming makes sense. For this
        # reason we may decided to maintain the same naming.
        # To solve it partially I give a better naming in this mapper.
        # SamplePackProducts just have max_units_per_ups_envelope column. In the case of correos package we assume that
        # only 1 fits in.
        {
            quantity:                      cart_product.quantity,
            max_units_per_correos_package: variant.try(:max_units_per_correos_envelope) || 1,
            max_units_per_ups_package:     variant.max_units_per_ups_envelope,
            shipping_package_category:     variant.shipping_package_category
        }
      end
    end
  end
end