module RefundMethods
  extend ActiveSupport::Concern
  included do
    class_attribute :eligible_refund_methods
    self.eligible_refund_methods = whitelisted_refund_methods.empty? ? defined_refund_methods : whitelisted_refund_methods
  end

  class_methods do
    def whitelisted_refund_methods
      # Override this methods to whitelist payment methods
      []
    end

    def defined_refund_methods
      payment_methods = Spree::PaymentMethod.pluck(:type)
      sorted_payment_methods = payment_methods.reject { |payment_method| payment_method =~ /StoreCredit/ }
      (sorted_payment_methods | payment_methods).map(&:constantize)
    end
  end
end