require 'cell_set/member'

module CellSet
  class Position
    ATTRIBUTES = [:members, :ordinal]

    include Attributes
    include ActiveModel::Serializers::JSON
    include ActiveModel::Serializers::Xml
    include Comparable
    self.include_root_in_json = false

    def <=>(other)
      if other.is_a?(self.class)
        @ordinal <=> other.ordinal
      else
        nil
      end
    end

    def between?(min, max)
      @ordinal <= min || @ordinal >= max
    end

    def from_json(*)
      super.tap{|obj| obj.freeze}
    end

    def initialize(*)
      @members = []
      super
    end

    def members=(members)
      if members.is_a?(Array)
        @members = members.map do |member|
          if member.is_a?(Member)
            member
          elsif member.is_a?(Hash)
            Member.new(member)
          else
            raise ArgumentError
          end
        end
      else
        raise ArgumentError
      end
    end

    def ordinal=(ordinal)
      @ordinal = if ordinal.is_a?(Fixnum)
        ordinal
      elsif ordinal.is_a?(String)
        Integer(ordinal)
      else
        raise ArgumentError
      end
    end
  end
end