// Short-TTL cache for token -> environment lookups, so a page full of static assets doesn't
// hit the Provisioner once per asset. Deliberately short (a few seconds) — correctness
// (routing to a destroyed/reset environment) matters more than shaving a few Provisioner
// round-trips, and a short TTL means a destroy/reset is reflected almost immediately.

const TTL_MS = 5000;
const cache = new Map(); // token -> { env, expiresAt }

function get(token) {
  const hit = cache.get(token);
  if (!hit || hit.expiresAt < Date.now()) return null;
  return hit.env;
}

function set(token, env) {
  cache.set(token, { env, expiresAt: Date.now() + TTL_MS });
}

function invalidate(token) {
  cache.delete(token);
}

module.exports = { get, set, invalidate };