import type { APIRoute } from 'astro';
import { site } from '@shared/lib/site';

export const prerender = true;

// Port of preview/pages/robots.liquid: the sitemap URL is absolute outside
// development, and crawling is allowed only in the preview environment.
export const GET: APIRoute = () => {
	const environment = process.env.NODE_ENV || 'production';
	const sitemapBase = environment !== 'development' ? site.previewUrl : '';
	const body = `Sitemap: ${sitemapBase}/sitemap.xml


User-agent: *
Disallow:${environment === 'preview' ? '' : ' /'}
`;

	return new Response(body, {
		headers: {
			'Content-Type': 'text/plain; charset=utf-8',
		},
	});
};