'use strict';
// Rednote-only admission control. Includes JSON consumption in the critical section.
module.exports = function providerGate(fetchImpl, maxPending = 4) {
  let tail = Promise.resolve(), pending = 0;
  return function (...args) {
    if (pending >= maxPending) return Promise.reject(Error('Detection queue is full'));
    pending++;
    const result = tail.then(async () => {
      args[1]?.signal?.throwIfAborted();
      const response = await fetchImpl(...args);
      const data = await response.json();
      return { ok: response.ok, status: response.status, json: async () => data };
    });
    tail = result.catch(() => {}).finally(() => { pending--; });
    return result;
  };
};