import type { APIRoute } from 'astro';

const shouldPermitRobots = import.meta.env.MODE !== 'development';

const permissiveRobotsTxt = `
User-agent: *
Allow: /

Sitemap: ${new URL('sitemap-index.xml', import.meta.env.SITE).href}
`.trimStart();

const restrictiveRobotsTxt = `
User-agent: *
Disallow: /
`.trimStart();

export const GET: APIRoute = () => {
  return new Response(shouldPermitRobots ? permissiveRobotsTxt : restrictiveRobotsTxt, {
    headers: {
      'Content-Type': 'text/plain; charset=utf-8',
    },
  });
};