module Patentscope

  class WebserviceSoapBuilder

    def build_envelope(operation, options_hash)
      builder = Nokogiri::XML::Builder.new do |xml|
        xml.Envelope do
          ns = xml.doc.root.add_namespace_definition('S', 'http://schemas.xmlsoap.org/soap/envelope/')
          xml.doc.root.namespace = ns
          xml.Body do
            xml.send(operation, :'xmlns' => 'http://www.wipo.org/wsdl/ps') do
              options_hash.each do |key, value|
                xml.send(key, value)
              end
            end
          end
        end
      end.to_xml
    end

    def strip_envelope(response, operation)
      case operation
      when :getAvailableDocuments
        result_tag = 'doc'
      when :getDocumentContent
        result_tag = 'documentContent'
      when :getDocumentOcrContent
        result_tag = 'documentContent'
      when :getIASR
        result_tag = 'wo-international-application-status'
      when :getDocumentTableOfContents
        result_tag = 'content'
      when :getDocumentContentPage
        result_tag = 'pageContent'
      end
      doc = Nokogiri::XML(response)
      stripped_response = doc.xpath("//iasr:#{result_tag}", 'iasr' => "http://www.wipo.org/wsdl/ps").to_xml
      # this seems to be the only way to add back the XML declaration to the XML!
      stripped_response_with_declaration = Nokogiri::XML(stripped_response).to_s
      stripped_response_with_declaration
    end
  end
end