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

class Sequencer::Units < SimpleDelegator
  class Attribute

    attr_accessor :from, :to, :optional

    # Checks if the attribute will be provided by one or more Units.
    #
    # @example
    #  attribute.will_be_provided?
    #  # => true
    #
    # @return [Boolean]
    def will_be_provided?
      !from.nil?
    end

    # Checks if the attribute will be used by one or more Units.
    #
    # @example
    #  attribute.will_be_used?
    #  # => true
    #
    # @return [Boolean]
    def will_be_used?
      till.present?
    end

    def optional?
      to.nil? && !optional.nil?
    end

    def cleanup?(index)
      return true if !will_be_used?

      till <= index
    end

    def available?(index)
      index.between?(from, till)
    end

    def till
      [to, optional].compact.max
    end
  end
end