import { cache } from "react";
import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import {
  getSite,
  isValidSiteId,
  listSiteIds,
  type Site,
} from "yt-dlp-transcript-common/lib/site";

// The layout and every tab page need the site — the layout for the title,
// the page for its own section. React cache() dedupes them into ONE read per
// request (the channel routes do the same, channelConfigCache.ts). Returns
// null for an id that is malformed or has no site.json, so the caller's
// notFound() is the one 404 for /sites/<missing> and every tab under it.
// Request-scoped, not a process cache: a site renamed by the form on the
// previous request is read fresh on the next one.
export const getSiteCached = cache((siteId: string): Site | null => {
  const paths = getPaths();
  if (!isValidSiteId(siteId) || !listSiteIds(paths).includes(siteId)) return null;
  return getSite(siteId, paths);
});