# Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

module Sequencer::Unit::Common::Mixin::DynamicAttribute

  def self.included(base)

    class << base

      def inherited(base)
        super

        base.extend(Forwardable)
        base.instance_delegate [:attribute] => base
      end

      def attribute
        @attribute ||= begin
          if uses.size != 1
            raise "DynamicAttribute classes can use exactly one attribute. Found #{uses.size}."
          end

          uses.first
        end
      end
    end
  end

  private

  def attribute_value
    @attribute_value ||= state.use(attribute)
  end
end