module ActiveModel
  module Validations
    class CreditCardNumberValidator < EachValidator

      def validate_each(record, attribute, value)
        brands = options.fetch(:brands) 
        record.errors[attribute] << (options[:message] || "is not valid") unless credit_card_valid?(value, Array.wrap(brands))
      end

      def credit_card_valid?(number, brands = [])
        CreditCardValidations::Detector.new(number).valid?(*brands)
      end
    end
  end
end