// 点击"下载视频"时执行：读取当前 <video> 的播放源，并把嗅探到的候选地址一起返回给宿主。
(function () {
  try {
    var vids = Array.prototype.slice.call(document.querySelectorAll("video"));
    var best = null;
    for (var i = 0; i < vids.length; i++) {
      var v = vids[i];
      if (v.videoWidth > 0 || !isNaN(v.duration)) {
        best = v;
        break;
      }
    }
    if (!best) best = vids[0];

    var current = "";
    var playable = true;
    if (best) {
      current = best.currentSrc || best.src || "";
      if (!current) {
        var s = best.querySelector && best.querySelector("source");
        if (s) current = s.src || s.getAttribute("src") || "";
      }
      if (best.networkState === 0 || (best.msKeySystemLoaded && !best.src))
        playable = false;
    }

    var title = document.title || "";
    var h1 = document.querySelector("h1");
    if (h1 && h1.innerText) title = h1.innerText;

    var anchors = [];
    var links = document.querySelectorAll("a[href]");
    for (var j = 0; j < links.length; j++) {
      var h = links[j].href;
      if (
        window.__reportMedia &&
        /\.(mp4|flv|m3u8|mov|mkv|webm|ts)(\?|#|$)/i.test(h)
      )
        anchors.push(h);
    }

    return JSON.stringify({
      current: current || "",
      playable: playable,
      usesMse: !!window.__usesMse || /^blob:/i.test(current),
      title: title,
      pageUrl: location.href,
      sniffed: (window.__mediaUrls || []).slice(-60),
      anchors: anchors.slice(-20),
      m3u8Blobs: (window.__m3u8Blobs || []).slice(-1),
    });
  } catch (e) {
    return JSON.stringify({
      current: "",
      title: document.title || "",
      pageUrl: location.href,
      error: String(e),
    });
  }
})();