class WebAnnotationSerializer {

  static serialize = (note) => {

    const categories = note.get('categories');

    const baseAnnotation = {

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

      "type":     "Annotation",

    }

    const source = "/session/" + note.get('session') + "/notes/" + note.get('_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 })

      }

      const selectors = [

        {

          "type": "TextQuoteSelector",

          "exact": category.text,

        }, {

          "type": "TextPositionSelector",

          "start": category.selection.start,

          "end": category.selection.end,

        }

      ]

      return Object.assign({}, annotation, {

        "target": {

          "source": source,

          "selector": selectors

        }

      })

    });

  }

}

export default WebAnnotationSerializer