/* OxygenHub report frame (oxygenhub#127): the hub adds this to a report's

   HTML pages. It tells the page around the frame how tall the report is,

   so the frame grows to fit instead of scrolling, and takes the hub's

   theme (data-theme="dark" or "light" on <html>) for report.css. It sends

   nothing but sizes, and reads nothing but the theme. */

(function () {

  if (window.parent === window) return;

  var root = document.documentElement, last = 0;

  var send = function () {

    var h = Math.ceil(Math.max(root.scrollHeight, document.body ? document.body.scrollHeight : 0));

    if (h && h !== last) {

      last = h;

      window.parent.postMessage({ oxygenhubReport: { height: h } }, "*");

    }

  };

  window.addEventListener("message", function (e) {

    if (e.source !== window.parent) return;

    var t = e.data && e.data.oxygenhubTheme;

    if (t === "dark" || t === "light") root.dataset.theme = t;

  });

  window.addEventListener("load", send);

  if (window.ResizeObserver) new ResizeObserver(send).observe(root);

  else setInterval(send, 500);

  // The frame interface (RP4): report.run() is the run on screen, and

  // report.history("frames.csv") that file of data/ across the report's

  // runs on its bookmark, oldest first, each { run, created_ms, current,

  // text }. Both are promises; outside the hub there is no report object.

  var asked = 0, waiting = {};

  window.addEventListener("message", function (e) {

    var a = e.source === window.parent && e.data && e.data.oxygenhubAnswer;

    if (!a || !waiting[a.n]) return;

    var w = waiting[a.n]; delete waiting[a.n];

    if (a.error) w.reject(new Error(a.error)); else w.resolve(a.value);

  });

  var ask = function (what, dataset) {

    return new Promise(function (resolve, reject) {

      var n = ++asked;

      waiting[n] = { resolve: resolve, reject: reject };

      window.parent.postMessage({ oxygenhubAsk: { n: n, what: what, dataset: dataset } }, "*");

      setTimeout(function () { if (waiting[n]) { delete waiting[n]; reject(new Error("no answer from the hub")); } }, 30000);

    });

  };

  window.report = { run: function () { return ask("run"); }, history: function (dataset) { return ask("history", dataset); } };

  window.parent.postMessage({ oxygenhubReport: { ready: true } }, "*");

})();