import { createServer } from "node:http";

const MAX_BODY = 1_048_576; // 1MB

const server = createServer(async (req, res) => {
  if (req.method !== "POST" || req.url !== "/users") {
    res.writeHead(404);
    res.end("Not Found");
    return;
  }

  const contentType = req.headers["content-type"] ?? "";
  if (!contentType.includes("application/json")) {
    res.writeHead(415, { "Content-Type": "application/json" });
    res.end(JSON.stringify({ error: "Unsupported Media Type" }));
    return;
  }

  let body = "";
  for await (const chunk of req) {
    body += chunk;
    if (body.length > MAX_BODY) {
      res.writeHead(413, { "Content-Type": "application/json" });
      res.end(JSON.stringify({ error: "Payload Too Large" }));
      req.destroy();
      return;
    }
  }

  const payload = JSON.parse(body);
  res.writeHead(201, { "Content-Type": "application/json" });
  res.end(JSON.stringify({ ok: true, name: payload.name }));
});

server.listen(3000);