require 'om'

module Ddr
  module Metadata
    class PremisEvent

      include OM::XML::Document

      PREMIS_VERSION = "2.2"
      PREMIS_XMLNS = "info:lc/xmlns/premis-v2"
      PREMIS_SCHEMA = "http://www.loc.gov/standards/premis/v2/premis.xsd"
    
      #
      # PREMIS terminology based on version 2.2 of PREMIS standard
      # http://www.loc.gov/standards/premis/v2/premis-2-2.pdf
      #
      set_terminology do |t|
        t.root(:path => "event", :xmlns => PREMIS_XMLNS, :schema => PREMIS_SCHEMA)
        t.event_identifier(:path => "eventIdentifier") {
          t.type(:path => "eventIdentifierType")
          t.value(:path => "eventIdentifierValue")
        }
        t.event_type(:path => "eventType")
        t.event_date_time(:path => "eventDateTime")
        t.event_detail(:path => "eventDetail")
        t.event_outcome_information(:path => "eventOutcomeInformation") { 
          t.outcome(:path => "eventOutcome")
          t.detail(:path => "eventOutcomeDetail") {
            t.note(:path => "eventOutcomeDetailNote")
            t.extension(:path => "eventOutcomeDetailExtension")
          }
        }
        t.linking_object_identifier(:path => "linkingObjectIdentifier") {
          t.type(:path => "linkingObjectIdentifierType")
          t.value(:path => "linkingObjectIdentifierValue")
        }
      
        # proxy terms
        t.event_id_type(:proxy => [:event_identifier, :type])
        t.event_id_value(:proxy => [:event_identifier, :value])
        t.event_outcome(:proxy => [:event_outcome_information, :outcome])
        t.event_outcome_detail_note(:proxy => [:event_outcome_information, :detail, :note])
        t.linking_object_id_type(:proxy => [:linking_object_identifier, :type])
        t.linking_object_id_value(:proxy => [:linking_object_identifier, :value])
      end
    
      def self.xml_template
        builder = Nokogiri::XML::Builder.new do |xml|
          xml.event(:xmlns => PREMIS_XMLNS, 
                    "xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance",
                    "xsi:schemaLocation" => "#{PREMIS_XMLNS} #{PREMIS_SCHEMA}",
                    :version => PREMIS_VERSION)
        end
        builder.doc
      end

    end
  end
end