module NxtSchema
  module Validators
    class OptionalNode < Validator
      def initialize(conditional, missing_key)
        @conditional = conditional
        @missing_key = missing_key
      end

      register_as :optional_node
      attr_reader :conditional, :missing_key

      def build
        lambda do |application, value|
          args = [application, value]

          return if conditional.call(*args.take(conditional.arity))
          return if application.send(:keys).include?(missing_key.to_sym)

          message = ErrorMessages.resolve(
            application.locale,
            :required_key_missing,
            key: missing_key,
            target: application.input
          )

          application.add_error(message)
        end
      end
    end
  end
end