/**
 * DOM 工具 - 等待元素、Shadow DOM 穿透
 * 从 docs/extension/plan.md §6.5 移植
 */

/**
 * 等待任一选择器出现（MutationObserver + 超时）
 */
export function waitForAny(
  selectors: string[],
  timeoutMs = 10_000
): Promise<Element | null> {
  const hit = () => selectors.map(s => document.querySelector(s)).find(Boolean) ?? null;

  const found = hit();
  if (found) return Promise.resolve(found);

  return new Promise((resolve) => {
    const timer = setTimeout(() => {
      observer.disconnect();
      resolve(null);  // 超时返回 null
    }, timeoutMs);

    const observer = new MutationObserver(() => {
      const el = hit();
      if (el) {
        clearTimeout(timer);
        observer.disconnect();
        resolve(el);
      }
    });

    observer.observe(document.documentElement, { childList: true, subtree: true });
  });
}

/**
 * 穿透 Shadow DOM 查询元素
 * 1688 部分组件用了 Web Components
 */
export function queryAllDeep(selectors: string[]): Element[] {
  const out: Element[] = [];
  for (const sel of selectors) {
    let nodes: NodeListOf<Element>;
    try {
      nodes = document.querySelectorAll(sel);
    } catch {
      continue;  // 选择器写错不能拖垮整个扫描
    }
    nodes.forEach(el => {
      if (el.shadowRoot) {
        out.push(...Array.from(el.shadowRoot.querySelectorAll('img, video')));
      } else {
        out.push(el);
      }
    });
  }
  return out;
}