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module Sem4r
  class CriterionPlacement < Criterion

    g_accessor :url

    def initialize(ad_group, url = nil, &block)
      super( ad_group )
      self.type = Placement
      self.url = url unless url.nil?
      if block_given?
        block.arity < 1 ? instance_eval(&block) : block.call(self)
      end
    end

    def self.create(ad_group, &block)
      new(ad_group, &block).save
    end

    def self.from_element( ad_group, el )
      new(ad_group) do
        @id      = el.at_xpath("id").text.strip.to_i
        url        el.at_xpath("url").text.strip
      end
    end

    def to_s
      "#{saved? ? id : 'unsaved'} #{type} #{url}"
    end

    def xml(t)
      t.criterion("xsi:type" => "#{type}") do |ad|
        ad.url  url
      end
    end

    def to_xml(tag)
      builder = Builder::XmlMarkup.new
      t = builder.tag!(tag, "xsi:type" => "CriterionKeyword")
      xml(t)
    end

  end
end