import { validateHeaderValue } from 'node:http';
export class ProxyError extends Error {
  constructor(code) { super(code); this.name = 'ProxyError'; this.code = code; }
}
export const refuse = code => { throw new ProxyError(code); };

export function validManagementKey(key) {
  if (typeof key !== 'string' || !/^[\x21-\x7e]{1,4096}$/.test(key)) return false;
  try { validateHeaderValue('Authorization', `Bearer ${key}`); return true; }
  catch { return false; }
}

export function proxyTiming(value) {
  const result = {};
  for (const [field, max, code] of [['rotateGraceMinutes', 1440, 'proxy-rotate-grace-invalid'], ['firstOutputSeconds', 3600, 'proxy-first-output-invalid']]) {
    if (!Object.hasOwn(value, field)) continue;
    if (!Number.isInteger(value[field]) || value[field] < 1 || value[field] > max) refuse(code);
    result[field] = value[field];
  }
  return result;
}