import _ from 'lodash';

import {

  RECEIVE_ANNOTATIONS,

} from '../actions';

function documents(

  state = {

    documents: {},

  },

  action,

) {

  switch (action.type) {

    case RECEIVE_ANNOTATIONS:

      return Object.assign({}, state, {

        documents: _(action.annotations)

          .groupBy('uri')

          .map((annotList, url) => {

            const users = _(annotList).map(a => a.user).uniq().value();

            const tagsCall = _(annotList)

              .reduce(

                (res, annot) => res.concat(annot.tags.filter(t => t.toLowerCase().startsWith('need:'))),

                [],

              );

            const commentsNb = _(annotList).reduce((res, annot) => {

              let fres = res;

              if (annot.references && annot.references.length) {

                fres += 1;

              }

              return fres;

            }, 0);

            return [

              url,

              {

                uri: url,

                annotations: annotList.length,

                users: users.length,

                calls: tagsCall.length,

                comments: commentsNb,

                updated: annotList[0].updated,

              },

            ];

          }).fromPairs()

          .value(),

      });

    default:

      return state;

  }

}

export default documents;