import { SITEMAP_HEADERS, shardEntries, toUrlset } from '@/components/meta/sitemap-data';

/** Sitemap shards: /sitemap/static.xml, /sitemap/model-0.xml … (5 000 URLs per shard, from GET /sitemap?type=&offset=). */
export const revalidate = 3600;

export async function GET(_req: Request, ctx: { params: Promise<{ shard: string }> }): Promise<Response> {
  const { shard } = await ctx.params;
  const m = /^([a-z_]+(?:-\d+)?)\.xml$/.exec(shard);
  if (!m) return new Response('Not Found', { status: 404 });
  const entries = await shardEntries(m[1] as string);
  if (entries === null) return new Response('Not Found', { status: 404 });
  return new Response(toUrlset(entries), { headers: SITEMAP_HEADERS });
}