module Mabmapper
  module MabXml
    class Field
      attr_reader :name, :subfields

      def initialize(name)
        @name      = name
        @subfields = []
      end

      def add_subfield(subfield)
        raise if subfield.blank? or not subfield.is_a?(Subfield)

        @subfields << subfield
      end

      def values(options = {})
        options.reverse_merge!(join_subfields: nil)
        values = @subfields.map(&:value)

        join = options[:join_subfields]
        join ? values.join((!!join==join) ? nil : join.to_s) : values
      end

      def value(options = {})
        options.reverse_merge!(join_subfields: ' ')
        values(options)
      end

      def has_subfield?(subfield)
        subfields.any?{|s| s.name.to_s == subfield.to_s}
      end

      def get_subfield(subfield)
        subfields.select{|s| s.name.to_s == subfield.to_s}.try(:first)
      end

      def to_s
        value
      end
    end
  end
end