import { listSummaries } from '#lib/server/lists.js';
import { db } from '#lib/server/db/index.js';
import { blogArticles } from '#lib/server/db/schema/index.js';
import { SITE_ORIGIN } from '#lib/seo.js';
import { races } from '#lib/derby/races.js';
import { COURSES } from '#lib/language-learner/courses/index.js';
import { eq } from 'drizzle-orm';
import type { RequestHandler } from './$types';

const staticPaths = [
	'/',
	'/projects',
	'/trackers',
	'/blog',
	'/lists',
	'/projects/game-tracker',
	'/projects/game-tracker/pokemon',
	'/projects/game-tracker/osu',
	'/projects/game-tracker/pokemon/locations',
	'/projects/animaldex',
	'/projects/energy',
	'/projects/derby',
	'/projects/spotify-beatmap-finder',
	'/projects/world-opinions',
	'/projects/language-learner',
	...COURSES.map((c) => `/projects/language-learner/${c.code}`)
];

function escapeXml(value: string): string {
	return value.replace(/[<>&"']/g, (character) => {
		const entities: Record<string, string> = {
			'<': '&lt;',
			'>': '&gt;',
			'&': '&amp;',
			'"': '&quot;',
			"'": '&apos;'
		};
		return entities[character];
	});
}

export const GET: RequestHandler = async () => {
	const [articles, lists] = await Promise.all([
		db
			.select({ slug: blogArticles.slug, updatedAt: blogArticles.updatedAt })
			.from(blogArticles)
			.where(eq(blogArticles.status, 'published')),
		listSummaries()
	]);
	const entries: { path: string; lastmod?: string }[] = [
		...staticPaths.map((path) => ({ path })),
		...races.map((race) => ({ path: `/projects/derby/${race.slug}` })),
		...articles.map((article) => ({
			path: `/blog/${encodeURIComponent(article.slug)}`,
			lastmod: article.updatedAt.toISOString()
		})),
		...lists.map((list) => ({ path: `/lists/${encodeURIComponent(list.slug)}` }))
	];
	const body = `<?xml version="1.0" encoding="UTF-8"?>\n<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n${entries
		.map(
			({ path, lastmod }) =>
				`  <url><loc>${escapeXml(new URL(path, SITE_ORIGIN).href)}</loc>${lastmod ? `<lastmod>${lastmod}</lastmod>` : ''}</url>`
		)
		.join('\n')}\n</urlset>\n`;
	return new Response(body, {
		headers: {
			'content-type': 'application/xml; charset=utf-8',
			'cache-control': 'public, max-age=3600'
		}
	});
};