/** Wait until the fields required by the detail parser are available. */
export async function waitForAmazonDetailPageReady() {
  const deadline = Date.now() + 20000;
  const sleep = (milliseconds: number) =>
    new Promise<void>((resolve) => setTimeout(resolve, milliseconds));

  while (Date.now() < deadline) {
    if (window.location.pathname.startsWith('/ap/signin')) {
      throw new Error('Amazon 详情页需要重新登录');
    }
    if (document.querySelector('form[action*="validateCaptcha"], #captchacharacters')) {
      throw new Error('Amazon 详情页触发了验证码');
    }

    const unavailable = document.querySelector<HTMLElement>(
      '#availability .a-color-price, #outOfStock, #exports_desktop_qualifiedBuybox',
    );
    const title = document.querySelector<HTMLElement>('#title, #productTitle');
    const titleReady = Boolean(title?.textContent?.trim());
    if (document.readyState !== 'loading' && titleReady) {
      title?.scrollIntoView({ behavior: 'auto', block: 'center' });
      return true;
    }

    if (document.readyState !== 'loading' && unavailable) {
      throw new Error('Amazon 商品当前不可用，详情标题未加载');
    }
    await sleep(300);
  }

  throw new Error('Amazon 详情标题在 20 秒内未加载完成');
}