module CurationConcern
  class GenericWorkActor < CurationConcern::BaseActor

    def create
      super && attach_files && create_linked_resources
    end

    def update
      add_to_collections(attributes.delete(:collection_ids)) && super && attach_files && create_linked_resources
    end

    delegate :visibility_changed?, to: :curation_concern

    protected

    def files
      return @files if defined?(@files)
      @files = [attributes[:files]].flatten.compact
    end

    def attach_files
      files.all? do |file|
        attach_file(file)
      end
    end

    # The default behavior of active_fedora's has_and_belongs_to_many association,
    # when assigning the id accessor (e.g. collection_ids = ['foo:1']) is to add
    # to new collections, but not remove from old collections.
    # This method ensures it's removed from the old collections.
    def add_to_collections(new_collection_ids)
      return true if new_collection_ids.nil?
      #remove from old collections
      (curation_concern.collection_ids - new_collection_ids).each do |old_id|
        Collection.find(old_id).members.delete(curation_concern)
      end

      #add to new
      curation_concern.collection_ids = new_collection_ids
      true
    end

    def linked_resource_urls
      @linked_resource_urls ||= Array(attributes[:linked_resource_urls]).flatten.compact
    end

    def create_linked_resources
      linked_resource_urls.all? do |link_resource_url|
        create_linked_resource(link_resource_url)
      end
    end

    def create_linked_resource(link_resource_url)
      return true if ! link_resource_url.present?
      resource = LinkedResource.new.tap do |link|
        link.url = link_resource_url
        link.batch = curation_concern
        link.label = curation_concern.human_readable_type
      end
      Sufia::GenericFile::Actions.create_metadata(resource, user, curation_concern.pid)
      true
    rescue ActiveFedora::RecordInvalid
      false
    end

    private
    def attach_file(file)
      generic_file = GenericFile.new
      generic_file.file = file
      generic_file.batch = curation_concern
      Sufia::GenericFile::Actions.create_metadata(
        generic_file, user, curation_concern.pid
      )
      generic_file.embargo_release_date = curation_concern.embargo_release_date
      generic_file.visibility = visibility
      CurationConcern.attach_file(generic_file, user, file)
    end
  end
end