Method doCache

fbi/fbi.ts:480–528

(msg: Api.Message, args: string[])

    await msg.edit({ text: `🧭 正在摸排嫌疑人 ${target.name} 的窝点...`, parseMode: "html" });

    let bestPeer: string | null = null;
    let bestCount = 0;
    let bestMsg: CachedMsg | null = null;

    for (const [peer, chat] of this.chatCache) {
      let cnt = 0;
      let latest: CachedMsg | null = null;
      for (const m of chat.msgs) {
        if (String(m.senderId) === target.id) {
          cnt++;
          if (!latest) latest = m; // first hit = newest (msgs newest-first)
        }
      }
      if (cnt > bestCount) {
        bestCount = cnt;
        bestPeer = peer;
        bestMsg = latest;
      }
    }

    await msg.delete().catch(() => {});

    if (!bestPeer || bestCount === 0) {
      await this.sendReply(msg, `🤦‍♀ 摸排结果不尽人意，嫌疑人 ${target.name} 藏的很深。`);
      return;
    }

    // link text = group name, href points to target's latest msg in that group
    let link = `https://t.me/c/${peelChatId(bestPeer)}`;
    if (bestMsg) {
      const chat = this.chatCache.get(bestPeer)!;
      const mid = bestMsg.id;
      const href = chat.username ? `https://t.me/${chat.username}/${mid}` : `https://t.me/c/${peelChatId(bestPeer)}/${mid}`;
      link = `<a href="${href}">${htmlEsc(chat.title || chat.username || bestPeer)}</a>`;
    }
    await this.sendReply(msg, `🏚 发现嫌疑人 ${target.name} 的窝点：\n\n${link}\n\n<i>跑得了和尚跑不了庙。</i>`);
  }

  /* ====== obs (group-scoped surveillance) ====== */

  private async doObs(msg: Api.Message, args: string[]) {
    const cl = await getGlobalClient();
    if (!cl) return;

    // parse group link from first arg
    let scopePeer: string | undefined;
    const tme = args[0]?.match(/^(?:https?:\/\/)?t\.me\/(\w+)/i);
    let targetArgs = args;
    if (tme) {
      const gn = tme[1].toLowerCase();
      targetArgs = args.slice(1);
      for (const [p, c] of this.chatCache)