import {createServer} from 'node:http';

const sites = [
	{
		pattern: /^(?:www\.)?pixiv\.net(?:\/\w+)?\/artworks\/(\d+)(?:#(\d+))?/i,
		redirect: match => `https://pixiv.kmn5.li/${match[1]}${match[2] ? `_${parseInt(match[2], 10) - 1}` : ''}`,
	},
	{
		pattern: /^(?:www\.)?(?:twitter\.com|x\.com)\/(.+)/,
		redirect: match => `https://fxtwitter.com/${match[1]}`,
	},
	// idk send me more of these
];

createServer(async (request, response) => {
	const error = () => response.writeHead(400).end('whar');
	if (request.method !== 'GET') return error();
	let input = request.url.slice(1); // leading slash
	if (input.startsWith('https://')) {
		input = input.slice(8);
	} else if (input.startsWith('http://')) {
		input = input.slice(7);
	} else if (!input) { // "homepage"
		return response.writeHead(301, {'Location': 'https://git.ewin.moe/erin/fix-my-shit'}).end();
	}
	for (const site of sites) {
		let match = input.match(site.pattern);
		if (!match) continue;
		response.writeHead(302, {'Location': site.redirect(match)}).end();
		return;
	}
	return error();
}).listen(process.env.PORT || 80);