#!/bin/env -S deno run --allow-read --allow-net

async function main() {
	const port = 1728;
	const server = Deno.serve({ port }, (request) => handle(request));
	await server.finished;
}

async function handle(request: Request) {
	const script = await open_requested_script(request);
	if (script instanceof Response) return script;
	console.log("Serving", script.path);
	return new Response(script.content.readable);
}

async function open_requested_script(request: Request) {
	const requested_path = new URL(request.url).pathname.slice(1);
	const invalid = () => new Response("Invalid script.", { status: 400 });
	if (requested_path.includes("/")) return invalid();
	if (requested_path.includes(".")) return invalid();
	try {
		const path = "./scripts/" + requested_path + ".lua";
		const content = await Deno.open(path, { read: true });
		return { path, content };
	} catch (_) {
		return new Response("Unknown script.", { status: 400 });
	}
}

if (import.meta.main) await main();