import http from "node:http";
import { readFile } from "node:fs/promises";
import { fileURLToPath } from "node:url";
import path from "node:path";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const port = process.env.PORT ? Number(process.env.PORT) : 8080;

const server = http.createServer(async (req, res) => {
  try {
    const url = new URL(
      req.url ?? "/",
      `http://${req.headers.host ?? "localhost"}`,
    );
    const pathname = url.pathname === "/" ? "/index.html" : url.pathname;

    // Only serve files from this folder; keep it intentionally simple.
    const safePath = path.normalize(pathname).replace(/^(\.\.(\/|\\|$))+/, "");
    const filePath = path.join(__dirname, safePath);

    const data = await readFile(filePath);
    const ext = path.extname(filePath).toLowerCase();

    const contentType =
      ext === ".html"
        ? "text/html; charset=utf-8"
        : ext === ".js"
          ? "text/javascript; charset=utf-8"
          : ext === ".css"
            ? "text/css; charset=utf-8"
            : "application/octet-stream";

    res.writeHead(200, { "Content-Type": contentType });
    res.end(data);
  } catch {
    res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
    res.end("Not found");
  }
});

server.listen(port, () => {
  // Intentionally minimal output.
  console.log(`Keyboard game running on http://localhost:${port}`);
});