/* global location, navigator, sessionStorage, window */
(function () {
  if (!("serviceWorker" in navigator)) return;

  var version = "docs-v3";
  var workerUrl = "/sw.js?v=" + encodeURIComponent(version);
  if (window.trustedTypes) {
    try {
      workerUrl = window.trustedTypes
        .createPolicy("wrnexus-pwa-recovery", {
          createScriptURL: function (value) {
            return value;
          },
        })
        .createScriptURL(workerUrl);
    } catch {
      // A previously-created policy can make creation fail; the same-origin
      // string remains valid when Trusted Types enforcement is not active.
    }
  }

  var reloading = false;
  navigator.serviceWorker.addEventListener("controllerchange", function () {
    var key = "wrnexus-pwa-controller-" + version;
    if (reloading || sessionStorage.getItem(key)) return;
    reloading = true;
    sessionStorage.setItem(key, "1");
    location.reload();
  });

  navigator.serviceWorker
    .register(workerUrl, { updateViaCache: "none" })
    .then(function (registration) {
      return registration.update();
    })
    .catch(function () {});
})();