// app/api/sitemap/route.js
import { getAllSlugs } from '@/utils/data';
import fs from 'fs';
import path from 'path';

export async function POST(req) {
  const secret = req.headers.get('x-revalidate-secret');
  if (secret !== process.env.REVALIDATE_TOKEN) {
    return new Response('Unauthorized', { status: 401 });
  }
  const slugs = await getAllSlugs();
  const siteUrl = process.env.PUBLIC_SITE_URL || 'https://yourdomain.com';
  const urls = slugs.map(slugArr => {
    if (slugArr.length === 1 && slugArr[0] === '/') {
      return '/';
    }
    return '/' + slugArr.join('/');
  });

  let uniqueUrls = Array.from(new Set(urls));
  if (!uniqueUrls.includes('/')) {
    uniqueUrls.unshift('/');
  } else {
    uniqueUrls = uniqueUrls.filter(url => url !== '/');
    uniqueUrls.unshift('/');
  }

  const sitemap = `<?xml version="1.0" encoding="UTF-8"?>\n<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n${uniqueUrls.map(url => `\n  <url>\n    <loc>${siteUrl}${url}</loc>\n    <changefreq>weekly</changefreq>\n    <priority>0.7</priority>\n  </url>`).join('')}\n</urlset>`;
  fs.writeFileSync(path.join(process.cwd(), 'public/sitemap.xml'), sitemap, 'utf8');
  return new Response('Sitemap regenerated', { status: 200 });
}