// MAIN world 桥 —— 跑在页面主世界，读取页面 JS 变量（isolated world 读不到）。
// 协议（对齐竞品 inject.js 模式）：
//   isolated → MAIN:  {type:'sc-bridge-req', requestId, keys: [...]}   keys 含 '*' 时返回诊断键列表
//   MAIN → isolated:  {type:'sc-bridge-res', requestId, payload: {key: value}}
// MAIN 侧零业务逻辑：只读白名单键、JSON 序列化过滤后回传，不注入任何页面行为。
export default defineContentScript({
  matches: [
    'https://*.ozon.ru/*', 'https://*.ozon.kz/*', 'https://*.ozon.by/*',
    'https://detail.1688.com/*',
    'https://item.taobao.com/*', 'https://detail.tmall.com/*',
  ],
  world: 'MAIN',
  main() {
    window.addEventListener('message', (ev: MessageEvent) => {
      if (ev.source !== window) return;
      const d = ev.data as { type?: string; requestId?: string; keys?: string[] } | null;
      if (!d || d.type !== 'sc-bridge-req' || !d.requestId || !Array.isArray(d.keys)) return;

      const payload: Record<string, unknown> = {};
      if (d.keys.includes('*')) {
        // 诊断模式：列出页面上可能有数据的全局键
        payload['__sc_window_keys__'] = Object.keys(window).filter(k =>
          /^(__|_)?[A-Za-z]/.test(k) && /(context|rawData|ICE|sku|item|g_config|DATA|state)/i.test(k)
        );
      }
      for (const k of d.keys) {
        if (k === '*') continue;
        try {
          const v = (window as unknown as Record<string, unknown>)[k];
          if (v !== undefined) payload[k] = JSON.parse(JSON.stringify(v));  // 过滤函数/循环引用
        } catch { /* 不可序列化的跳过 */ }
      }
      window.postMessage({ type: 'sc-bridge-res', requestId: d.requestId, payload }, '*');
    });
  },
});