import { indexXml, sitemapChunks } from '@/lib/sitemap';
import { SITE_URL } from '@/lib/site';

export const dynamic = 'force-dynamic';

/** Sitemap index → chunked sitemaps at /sitemap/<id> (cancers, genes, drugs, trials, sources) + /sitemap/countries. */
export async function GET() {
  const chunks = await sitemapChunks();
  const xml = indexXml([0, ...chunks.map((c) => c.id)]).replace('</sitemapindex>', `  <sitemap><loc>${SITE_URL}/sitemap/countries</loc><lastmod>${new Date().toISOString()}</lastmod></sitemap>\n</sitemapindex>`);
  return new Response(xml, { headers: { 'Content-Type': 'application/xml; charset=utf-8', 'Cache-Control': 'public, max-age=3600' } });
}