class WebAnnotationSerializer {

  static serialize = (note) => {

    const categories = note.categories;

    const baseAnnotation = {

      '@context': "http://www.w3.org/ns/anno.jsonld",

      "type":     "Annotation",

    }

    const source = "/session/" + note.session + "/notes/" + note._id;

    return categories.map((category, index) => {

      let annotation = Object.assign({}, baseAnnotation, {

        id: index

      });

      if (category.hasOwnProperty('hasComment') && category.hasComment) {

        const body = {

          "type": "TextualBody",

          "value": category.comment,

          "format": "text/plain"

        };

        annotation = Object.assign({}, annotation, { body })

      }

      return Object.assign({}, annotation, {

        "target": {

          "source": source,

          "selector": {

            "type": "TextQuoteSelector",

            "exact": category.text,

          }

        }

      })

    });

  }

}

export default WebAnnotationSerializer