/** 填表后人类节奏延迟（毫秒）：降低 WAF/Cloudflare 误触风险 */
export const RPA_HUMAN_PACING_MIN_MS = 100;
export const RPA_HUMAN_PACING_MAX_MS = 300;

function readPacingBounds(): { min: number; max: number } | null {
  if (process.env.RPA_HUMAN_PACING === "false") {
    return null;
  }
  const minRaw = process.env.RPA_HUMAN_PACING_MIN_MS?.trim();
  const maxRaw = process.env.RPA_HUMAN_PACING_MAX_MS?.trim();
  const min =
    minRaw && Number.isFinite(Number(minRaw))
      ? Math.max(0, Number(minRaw))
      : RPA_HUMAN_PACING_MIN_MS;
  const max =
    maxRaw && Number.isFinite(Number(maxRaw))
      ? Math.max(min, Number(maxRaw))
      : RPA_HUMAN_PACING_MAX_MS;
  return { min, max };
}

/** 随机人类节奏等待时长；RPA_HUMAN_PACING=false 时返回 0 */
export function humanPacingDelayMs(): number {
  const bounds = readPacingBounds();
  if (!bounds) {
    return 0;
  }
  const span = bounds.max - bounds.min;
  return bounds.min + Math.floor(Math.random() * (span + 1));
}

/** 填表/点击后短暂停顿，模拟真人输入节奏 */
export async function awaitHumanPacing(page: {
  waitForTimeout: (ms: number) => Promise<void>;
}): Promise<void> {
  const delay = humanPacingDelayMs();
  if (delay <= 0) {
    return;
  }
  await page.waitForTimeout(delay);
}