# frozen_string_literal: true

module Cocina
  module Models
    module Mapping
      module Normalizers
        module Mods
          # Normalizes a Fedora MODS document for geo extension elements.
          class GeoExtensionNormalizer
            # @param [Nokogiri::Document] mods_ng_xml MODS to be normalized
            # @param [String] druid
            # @return [Nokogiri::Document] normalized MODS
            def self.normalize(mods_ng_xml:, druid:)
              new(mods_ng_xml: mods_ng_xml, druid: druid).normalize
            end

            def initialize(mods_ng_xml:, druid:)
              @ng_xml = mods_ng_xml.dup
              @ng_xml.encoding = 'UTF-8'
              @druid = druid
            end

            def normalize
              normalize_geo_purl
              normalize_dc_image
              normalize_gml_id
              normalize_empty_resource
              ng_xml
            end

            private

            attr_reader :ng_xml, :druid

            def normalize_geo_purl
              ng_xml.root.xpath('//mods:extension[@displayLabel="geo"]//rdf:Description',
                                mods: ModsNormalizer::MODS_NS,
                                rdf: 'http://www.w3.org/1999/02/22-rdf-syntax-ns#').each do |node|
                node['rdf:about'] = "http://purl.stanford.edu/#{druid.delete_prefix('druid:')}"
              end
            end

            def normalize_dc_image
              ng_xml.root.xpath('//mods:extension[@displayLabel="geo"]//dc:type[text() = "image"]',
                                mods: ModsNormalizer::MODS_NS,
                                dc: 'http://purl.org/dc/elements/1.1/').each do |node|
                node.content = 'Image'
              end
            end

            def normalize_gml_id
              ng_xml.root.xpath("//gml:Point[@gml:id='ID']", gml: 'http://www.opengis.net/gml/3.2/').each do |point_node|
                point_node.delete('id')
              end
            end

            def normalize_empty_resource
              ng_xml.root.xpath('//dc:coverage[@rdf:resource = ""]',
                                dc: 'http://purl.org/dc/elements/1.1/',
                                rdf: 'http://www.w3.org/1999/02/22-rdf-syntax-ns#').each do |coverage_node|
                coverage_node.delete('resource')
              end
            end
          end
        end
      end
    end
  end
end