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import {unique} from '#sugar';
import {getTotalDuration} from '#wiki-data';
export default {
  relations: (relation, artist, album, trackContribLists) => ({
    template:
      relation('generateArtistInfoPageChunk'),
    albumLink:
      relation('linkAlbum', album),
    // Intentional mapping here: each item may be associated with
    // more than one contribution.
    items:
      trackContribLists.map(trackContribs =>
        relation('generateArtistInfoPageTracksChunkItem',
          artist,
          trackContribs)),
  }),
  data(_artist, album, trackContribLists) {
    const data = {};
    const contribs =
      trackContribLists.flat();
    data.dates =
      contribs
        .map(contrib => contrib.date);
    // TODO: Duration stuff should *maybe* be in proper data logic? Maaaybe?
    const durationTerms =
      unique(
        contribs
          .filter(contrib => contrib.countInDurationTotals)
          .map(contrib => contrib.thing)
          .filter(track => track.isMainRelease)
          .filter(track => track.duration > 0));
    data.duration =
      getTotalDuration(durationTerms);
    data.durationApproximate =
      durationTerms.length > 1;
    return data;
  },
  generate: (data, relations) =>
    relations.template.slots({
      mode: 'album',
      albumLink: relations.albumLink,
      dates: data.dates,
      duration: data.duration,
      durationApproximate: data.durationApproximate,
      items: relations.items,
    }),
};
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