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

/** Sitemap shards: /sitemap/0.xml (static + entities), /sitemap/1.xml … /sitemap/N.xml (satellites, 5 000 per shard). Hourly revalidation. */
export const revalidate = 3600;

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