module IIIFManifest
  module V3
    class ManifestBuilder
      class BodyBuilder
        attr_reader :display_content, :iiif_body_factory, :image_service_builder_factory
        def initialize(display_content, iiif_body_factory:, image_service_builder_factory:)
          @display_content = display_content
          @iiif_body_factory = iiif_body_factory
          @image_service_builder_factory = image_service_builder_factory
        end

        def apply(annotation)
          build_body
          image_service_builder.apply(body) if iiif_endpoint
          apply_auth_service if auth_service
          annotation.body = body
        end

        private

          def build_body
            body['id'] = display_content.url
            body['type'] = body_type
            body['height'] = display_content.height if display_content.try(:height).present?
            body['width'] = display_content.width if display_content.try(:width).present?
            body['duration'] = display_content.duration if display_content.try(:duration).present?
            body['format'] = display_content.format if display_content.try(:format).present?
            body['label'] = ManifestBuilder.language_map(display_content.label) if display_content.try(:label).present?
          end

          def body
            @body ||= iiif_body_factory.new
          end

          def body_type
            display_content.try(:type) || 'Image'
          end

          def iiif_endpoint
            display_content.try(:iiif_endpoint)
          end

          def image_service_builder
            image_service_builder_factory.new(iiif_endpoint)
          end

          def auth_service
            display_content.try(:auth_service)
          end

          def apply_auth_service
            body.service = if body['service'].blank?
                             [auth_service]
                           else
                             body['service'] + [auth_service]
                           end
          end
      end
    end
  end
end