/* global navigator, 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 recover = function () {
    navigator.serviceWorker
      .getRegistration()
      .then(function (registration) {
        if (
          registration &&
          registration.active &&
          registration.active.scriptURL.includes(version)
        ) {
          return;
        }
        return navigator.serviceWorker.register(workerUrl, { updateViaCache: "none" });
      })
      .catch(function () {});
  };

  if ("requestIdleCallback" in window) window.requestIdleCallback(recover, { timeout: 2000 });
  else window.setTimeout(recover, 0);
})();