(function initializePwa() {
  function notify(message) {
    window.CognitiveAgentConsole?.notify?.(message);
  }

  function showUpdate(registration) {
    notify("检测到前端更新，正在刷新页面");
    registration.waiting?.postMessage({ type: "SKIP_WAITING" });
  }

  async function register() {
    if (!("serviceWorker" in navigator) || !window.isSecureContext) return;
    try {
      const registration = await navigator.serviceWorker.register("/service-worker.js", {
        scope: "/",
        updateViaCache: "none",
      });
      await registration.update();
      if (registration.waiting) showUpdate(registration);
      registration.addEventListener("updatefound", () => {
        const worker = registration.installing;
        worker?.addEventListener("statechange", () => {
          if (worker.state === "installed" && navigator.serviceWorker.controller) {
            showUpdate(registration);
          }
        });
      });
      navigator.serviceWorker.addEventListener("controllerchange", () => window.location.reload());
      navigator.serviceWorker.addEventListener("message", (event) => {
        if (event.data?.type === "OFFLINE_READY") notify("PAD 离线资源已准备完成");
      });
    } catch (error) {
      console.warn("PWA registration failed", error);
    }
  }

  window.addEventListener("load", register, { once: true });
})();