/**
 * 淘宝/天猫 SSR 状态提取 —— 通过 MAIN world 桥读取页面全局变量。
 *
 * 候选键（selectors-taobao.md §5.3 列出的待评估项）：
 *   __ICE_APP_CONTEXT__           ICE 框架上下文（loaderData.home.data.res，v1 已知结构）★主
 *   __general_skupanel_cache_data 疑似完整 SKU 面板缓存（结构未知，容错深搜）
 *   __ICE_DATA_LOADER__           ICE 框架数据层（容错深搜）
 *
 * 输出对齐 ssr.ts 的 SSRData，供 buildFromSSR 消费。
 */
import type { SSRData } from './ssr';

/** 从 __ICE_APP_CONTEXT__ 结构映射（原 v1 extractSSRData 的对象版） */
function fromIceContext(ctx: unknown): SSRData | null {
  const res = (ctx as any)?.loaderData?.home?.data?.res;
  if (!res?.item?.title || !res?.item?.itemId) return null;
  const industryParams = res.plusViewVO?.industryParamVO;
  const extensionParams = res.componentsVO?.extensionInfoVO?.infos?.find(
    (i: any) => i.type === 'BASE_PROPS'
  );
  return {
    item: {
      title: res.item.title,
      itemId: res.item.itemId,
      images: res.item.images || [],
      videos: res.item.videos,
    },
    skuBase: res.skuBase,
    params: {
      basicParamList: industryParams?.basicParamList || extensionParams?.items || [],
      enhanceParamList: industryParams?.enhanceParamList || [],
    },
    price: res.componentsVO?.priceVO?.price || res.componentsVO?.priceVO?.extraPrice,
  };
}

/** 容错：未知结构里深搜「SKU props 数组」（元素含 name + values/props 嵰 name/imageUrl） */
function skuPropsFromUnknown(root: unknown): SSRData['skuBase'] | null {
  const candidates: any[] = [];
  const collect = (node: unknown, depth = 0) => {
    if (!node || typeof node !== 'object' || depth > 6 || candidates.length) return;
    if (Array.isArray(node)) {
      if (
        node.length >= 1 && node.every((x: any) => x && typeof x === 'object' &&
          typeof (x.prop ?? x.name) === 'string' && Array.isArray(x.values ?? x.props))
      ) { candidates.push(node.map((x: any) => ({
        pid: String(x.pid ?? ''),
        name: x.prop ?? x.name,
        values: (x.values ?? x.props).map((v: any) => ({
          vid: String(v.vid ?? ''),
          name: v.name ?? v.valueName ?? '',
          image: v.image ?? v.imageUrl,
        })),
      }))); return;
      }
      node.forEach(n => collect(n, depth + 1));
      return;
    }
    for (const v of Object.values(node as Record<string, unknown>)) collect(v, depth + 1);
  };
  collect(root);
  return candidates.length ? { props: candidates[0] } : null;
}

/** 容错：深搜参数数组（元素含 propertyName/valueName） */
function paramsFromUnknown(root: unknown): Array<{ propertyName: string; valueName: string }> {
  const out: Array<{ propertyName: string; valueName: string }> = [];
  const seen = new Set<string>();
  const walk = (node: unknown, depth = 0) => {
    if (!node || typeof node !== 'object' || depth > 6 || out.length > 60) return;
    if (Array.isArray(node)) {
      if (node.length >= 2 && node.every((x: any) => x && typeof x === 'object' &&
        typeof x.propertyName === 'string' && typeof x.valueName === 'string')) {
        for (const p of node) {
          const k = `${p.propertyName}=${p.valueName}`;
          if (!seen.has(k)) { seen.add(k); out.push({ propertyName: p.propertyName, valueName: p.valueName }); }
        }
      }
      node.forEach(n => walk(n, depth + 1));
      return;
    }
    for (const v of Object.values(node as Record<string, unknown>)) walk(v, depth + 1);
  };
  walk(root);
  return out;
}

export function taobaoStateFromBridge(keys: Record<string, any>): SSRData | null {
  // 主路径：ICE 上下文
  const ice = fromIceContext(keys['__ICE_APP_CONTEXT__']);
  if (ice) {
    // 主路径缺 SKU 时用面板缓存补
    if (!ice.skuBase?.props?.length) {
      const fromCache = skuPropsFromUnknown(keys['__general_skupanel_cache_data'] ?? keys['__ICE_DATA_LOADER__']);
      if (fromCache?.props?.length) ice.skuBase = fromCache;
    }
    return ice;
  }

  // 降级：只有面板缓存/数据层 —— 尽力拼一个最小 SSRData（标题给空，DOM 会补）
  const cacheRoot = keys['__general_skupanel_cache_data'] ?? keys['__ICE_DATA_LOADER__'];
  if (cacheRoot) {
    const skuBase = skuPropsFromUnknown(cacheRoot);
    const params = paramsFromUnknown(cacheRoot);
    if (skuBase?.props?.length || params.length) {
      return {
        item: { title: '', itemId: '', images: [], videos: [] },
        skuBase: skuBase ?? undefined,
        params: { basicParamList: params, enhanceParamList: [] },
        price: undefined,
      };
    }
  }
  return null;
}