/**
 * @file A background poll that slows down while it finds nothing to do: the
 * next pass runs `baseMs` after a pass that did work (or failed), `idleMs`
 * after one whose `tick` resolved `false` (nothing changed, nothing pending).
 * One pass at a time — the next is scheduled only once the last settled — and
 * every timer is `unref`'d. Used by the Cursor and Antigravity usage polls.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

/** Default slow interval: 60 s, never faster than the base one. */
const idleDefault = (baseMs) => Math.max(baseMs, 60_000);

/**
 * Run `tick` now, then again and again. `tick` resolves `false` for an idle
 * pass; anything else (or a throw) keeps the base pace.
 * @returns {{stop: () => void}}
 */
function startBackoffPoll(tick, { baseMs, idleMs = idleDefault(baseMs) }) {
  let timer = null;
  let stopped = false;
  const schedule = (ms) => {
    if (stopped) return;
    timer = setTimeout(run, ms);
    if (timer.unref) timer.unref();
  };
  function run() {
    Promise.resolve()
      .then(tick)
      .then(
        (busy) => schedule(busy === false ? idleMs : baseMs),
        () => schedule(baseMs)
      );
  }
  run();
  return {
    stop() {
      stopped = true;
      clearTimeout(timer);
    },
  };
}

module.exports = { startBackoffPoll, idleDefault };