import { generateSitemaps } from '../sitemaps/sitemap';
import { SITE_URL } from '@/lib/site';

/** Sitemap index: one entry per shard produced by `generateSitemaps` (served at /sitemaps/sitemap/<id>.xml). */
export const revalidate = 3600;

export async function GET(): Promise<Response> {
  const ids = await generateSitemaps();
  const body = `<?xml version="1.0" encoding="UTF-8"?>\n<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n${ids.map((s) => `  <sitemap><loc>${SITE_URL}/sitemaps/sitemap/${s.id}.xml</loc></sitemap>`).join('\n')}\n</sitemapindex>\n`;
  return new Response(body, { headers: { 'content-type': 'application/xml; charset=utf-8', 'cache-control': 'public, max-age=3600' } });
}