export_lom.rb

# frozen_string_literal: true

module LomService
  # rubocop:disable Metrics/ClassLength, Metrics/AbcSize, Metrics/MethodLength
  class ExportLom < ServiceBase
    include Rails.application.routes.url_helpers

    def initialize(task:, xml:)
      super()
      @task = task
      @xml = xml
    end

    def execute
      @xml.lom(xmlns: 'http://ltsc.ieee.org/xsd/LOM') do
        oml_general(@xml)
        oml_lifecycle(@xml)
        oml_meta_metadata(@xml)
        oml_technical(@xml)
        oml_educational(@xml)
        oml_rights(@xml)
        oml_relation(@xml)
        oml_annotation(@xml)
        # Other top-level elements: classification.
      end
    end

    private

    def oml_general(xml)
      xml.general do
        xml.identifier do
          xml.catalog 'UUID'
          xml.entry @task.uuid
        end
        xml.title do
          xml.string @task.title, language: @task.iso639_lang
        end
        xml.language @task.iso639_lang
        xml.description do
          html_fragment = Loofah.fragment(ApplicationController.helpers.render_markdown(@task.description))
          html_fragment.scrub!(NbpScrubber.new)
          xml.string html_fragment.to_s, language: @task.iso639_lang
        end
        if @task.programming_language&.language.present?
          xml.keyword do
            xml.string "programming language: #{@task.programming_language.language}", language: 'en'
          end
          if @task.programming_language&.version.present?
            xml.keyword do
              xml.string "programming language version: #{@task.programming_language.version}", language: 'en'
            end
          end
        end
        if @task.ratings.any?
          xml.keyword do
            xml.string "average rating: #{@task.rating_star}/5.0", language: 'en'
          end
        end
        @task.labels.each do |label|
          xml.keyword do
            xml.string label.name, language: 'en'
          end
        end
        xml.structure do
          xml.value 'atomic'
        end
        xml.aggregationLevel do
          xml.value 1
        end
      end
    end

    def oml_lifecycle(xml)
      xml.lifeCycle do
        xml.version do
          xml.string task_version, language: 'en'
        end
        xml.status do
          xml.value 'final'
        end
        xml.contribute do
          xml.role do
            xml.value 'author'
          end
          xml.entity vcard(@task.user)
          xml.date do
            # We omit the time part, since the regex provided by the xsd schema is broken regarding the time zone part.
            xml.dateTime @task.updated_at.to_date.iso8601
          end
        end
      end
    end

    def oml_meta_metadata(xml)
      xml.metaMetadata do
        xml.identifier do
          xml.catalog 'URI'
          xml.entry bridges_lom_task_url(@task)
        end
        xml.metadataSchema 'ProFormA MD 1.0'
        xml.language 'en'
      end
    end

    def oml_technical(xml)
      xml.technical do
        xml.format 'text/xml'
        xml.location task_url(@task, default_url_options)
        xml.location download_task_url(@task, default_url_options)
      end
    end

    def oml_educational(xml)
      xml.educational do
        xml.interactivityType do
          xml.value 'active'
        end
        xml.learningResourceType do
          xml.value 'exercise'
        end
        xml.interactivityLevel do
          xml.value 'high'
        end
        xml.semanticDensity do
          xml.value 'high'
        end
        xml.intendedEndUserRole do
          xml.value 'learner'
        end
        xml.context_ do
          xml.value 'school'
        end
        xml.context_ do
          xml.value 'higher education'
        end
        xml.context_ do
          xml.value 'training'
        end
        xml.typicalAgeRange do
          xml.string '13-'
        end
        xml.description do
          xml.string @task.internal_description, language: @task.iso639_lang
        end
        xml.language @task.iso639_lang
      end
    end

    def oml_rights(xml)
      xml.rights do
        xml.cost do
          xml.value 'no'
        end
        xml.copyrightAndOtherRestrictions do
          xml.value 'yes'
        end
        if @task.license.present?
          xml.description do
            xml.string @task.license.to_s, language: 'en'
          end
        else
          xml.description do
            xml.string 'Unknown license', language: 'en'
          end
        end
      end
    end

    def oml_relation(xml)
      parent = Task.find_by(uuid: @task.parent_uuid)
      if parent.present?
        xml.relation do
          xml.kind do
            xml.source 'LOMv1.0'
            xml.value 'isversionof'
          end
          xml.resource do
            xml.identifier do
              xml.catalog 'UUID'
              xml.entry parent.uuid
            end
            xml.identifier do
              xml.catalog 'URI'
              xml.entry task_url(parent, default_url_options)
            end
            xml.description do
              xml.string parent.description, language: parent.iso639_lang
            end
          end
        end
      end
    end

    def oml_annotation(xml)
      @task.comments.each do |comment|
        xml.annotation do
          xml.entity vcard(comment.user)
          xml.date do
            # We omit the time part, since the regex provided by the xsd schema is broken regarding the time zone part.
            xml.dateTime comment.updated_at.to_date.iso8601
          end
          xml.description do
            xml.string comment.text, language: @task.iso639_lang
          end
        end
      end
    end

    def task_version
      # TODO: Fix this N+1 query for example by adding a version column for tasks
      version = 1
      ancestor = @task
      while ancestor.parent_uuid.present?
        ancestor = Task.find_by(uuid: ancestor.parent_uuid)
        version += 1
      end
      version
    end

    def vcard(user)
      <<~VCARD
        BEGIN:VCARD
        VERSION:3.0
        FN;CHARSET=UTF-8:#{user.name}
        N;CHARSET=UTF-8:#{user.last_name};#{user.first_name};;;
        END:VCARD
      VCARD
    end

    def default_url_options
      ::Rails.application.config.action_mailer.default_url_options
    end
    # rubocop:enable all
  end
end