import type { APIRoute } from 'astro';
import { getCollection } from 'astro:content';

const slugify = (text: string) => {
  return text
    .toString()
    .toLowerCase()
    .replace(/\band\b/gi, '')
    .replace(/&/g, '')
    .replace(/\s+/g, '-')
    .replace(/[^\w\-]+/g, '')
    .replace(/\-\-+/g, '-')
    .replace(/^-+/, '')
    .replace(/-+$/, '');
};

export const GET: APIRoute = async () => {
  const posts = await getCollection('blog');

  const site = 'https://unifato.com';

  const urls = [
    { loc: site, priority: '1.0', changefreq: 'weekly' },
    { loc: `${site}/about`, priority: '0.9', changefreq: 'monthly' },
    { loc: `${site}/blog`, priority: '0.8', changefreq: 'weekly' },
    ...posts.map(post => ({
      loc: `${site}/blog/${slugify(post.data.title)}`,
      priority: '0.7',
      changefreq: 'monthly'
    })),
    { loc: `${site}/project`, priority: '0.8', changefreq: 'monthly' },
  ];
  const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${urls.map(url => `  <url>
    <loc>${url.loc}</loc>
    <changefreq>${url.changefreq}</changefreq>
    <priority>${url.priority}</priority>
  </url>`).join('\n')}
</urlset>`;

  return new Response(xml, {
    headers: {
      'Content-Type': 'application/xml',
    },
  });
};