// assets/mathjax-plotly.js
(function () {
  function attachListeners() {
    function typeset(target) {
      try {
        if (window.MathJax) {
          // v3
          if (typeof window.MathJax.typesetPromise === "function") {
            return window.MathJax.typesetPromise([target || document.body]);
          }
          // v2
          if (window.MathJax.Hub && typeof window.MathJax.Hub.Queue === "function") {
            window.MathJax.Hub.Queue(["Typeset", window.MathJax.Hub, target || document.body]);
          }
        }
      } catch (e) {
        console.warn("MathJax typeset failed:", e);
      }
    }

    document.addEventListener("plotly_afterplot", function (e) { typeset(e.target); });
    document.addEventListener("plotly_relayout",  function (e) { typeset(e.target); });
    document.addEventListener("plotly_redraw",   function (e) { typeset(e.target); });
    window.addEventListener("load", function () { typeset(document.body); });
  }

  // 如果已經有 MathJax，就只掛事件
  if (window.MathJax) { attachListeners(); return; }

  // 推薦載 v3（tex-svg 渲染器）；載完再掛事件
  var s = document.createElement("script");
  s.src = "https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js";
  s.defer = true;
  s.onload = attachListeners;
  document.head.appendChild(s);
})();