Module: Mercadona::Entity

Defined in:

lib/mercadona/entity/base.rb,
lib/mercadona/entity/order_item.rb,
lib/mercadona/entity/discount_rule.rb

Defined Under Namespace

Classes: Base

Constant Summary

OrderItem =

Mercadona::Entity::Base.new(:product_code, :name, :price, keyword_init: true) do
  # Understanding Ruby's floating-point precision issues for money calculations,
  # let's use whole numbers instead of floats.
  def price_in_fractional_currency
    (price.to_f * 100).to_i
  end
end

DiscountRule =

Mercadona::Entity::Base.new(:type, :condition, :quantity, :discount, keyword_init: true) do
  def initialize(type:, condition:, **args)
    validate_sensitive_args(type, condition)
    super
  end

  def amount_with_discount(order_item, order_item_quantity)
    type.call(self, order_item, order_item_quantity)
  end

  private

  def discount_class_valid?(discount_class)
    discount_class.respond_to?(:call)
  end

  def comparison_operator_valid?(comparison_operator)
    Mercadona::ALLOWED_COMPARISON_OPERATORS.include?(comparison_operator)
  end

  def validate_sensitive_args(discount_class, comparison_operator)
    raise Mercadona::Error::Argument, Mercadona::Error::Argument::DISCOUNT_CLASS unless discount_class_valid?(discount_class)
    raise Mercadona::Error::Argument, Mercadona::Error::Argument::COMPARISON_OPERATOR unless comparison_operator_valid?(comparison_operator)
  end
end