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import {atOffset} from '#sugar';
export default {
  sprawl: ({flashActData}) =>
    ({flashActData}),
  query(sprawl, flash) {
    // Don't sort chronologically here. The previous/next buttons should match
    // the order in the sidebar, by act rather than date.
    const flashes =
      sprawl.flashActData
        .flatMap(act => act.flashes);
    const index =
      flashes.indexOf(flash);
    const previousFlash =
      atOffset(flashes, index, -1);
    const nextFlash =
      atOffset(flashes, index, +1);
    return {previousFlash, nextFlash};
  },
  relations: (relation, query) => ({
    switcher:
      relation('generateInterpageDotSwitcher'),
    previousLink:
      relation('generatePreviousLink'),
    nextLink:
      relation('generateNextLink'),
    previousFlashLink:
      (query.previousFlash
        ? relation('linkFlash', query.previousFlash)
        : null),
    nextFlashLink:
      (query.nextFlash
        ? relation('linkFlash', query.nextFlash)
        : null),
  }),
  generate: (relations) =>
    relations.switcher.slots({
      links: [
        relations.previousLink
          .slot('link', relations.previousFlashLink),
        relations.nextLink
          .slot('link', relations.nextFlashLink),
      ],
    }),
};
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