// Service worker: push-уведомления + офлайн-оболочка мобильной версии (/m).
const CACHE = "shell-m-v3";
const SHELL = ["/m", "/static/m/m.js", "/static/m/m.css", "/static/m/manifest.webmanifest",
  "/static/m/icon-192.png", "/static/m/icon-512.png", "/static/m/apple-touch-icon.png", "/static/assistant.js"];

self.addEventListener("install", e => {
  e.waitUntil(caches.open(CACHE).then(c => Promise.allSettled(SHELL.map(u => c.add(u)))).then(() => self.skipWaiting()));
});
self.addEventListener("activate", e => {
  e.waitUntil(caches.keys().then(keys => Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k)))).then(() => self.clients.claim()));
});

const isShell = url => url.origin === self.location.origin && (url.pathname === "/m" || url.pathname === "/m/" || url.pathname.startsWith("/static/m/") || url.pathname === "/static/assistant.js");

// Сеть в приоритете (чтобы обновления приходили сразу), при отсутствии связи — кэш. API не перехватываем.
self.addEventListener("fetch", e => {
  const req = e.request, url = new URL(req.url);
  if (req.method !== "GET" || !isShell(url)) return;
  e.respondWith((async () => {
    const cache = await caches.open(CACHE);
    try {
      const net = await Promise.race([fetch(req), new Promise((_, rej) => setTimeout(() => rej(new Error("timeout")), 4000))]);
      if (net && net.ok) cache.put(url.pathname === "/m/" ? "/m" : req, net.clone());
      return net;
    } catch (err) {
      const hit = await cache.match(url.pathname === "/m/" ? "/m" : req, { ignoreSearch: true });
      if (hit) return hit;
      throw err;
    }
  })());
});

self.addEventListener("push", e => {
  let d = {};
  try { d = e.data.json(); } catch (_) { d = { title: "Чек-листы", body: e.data ? e.data.text() : "" }; }
  e.waitUntil(self.registration.showNotification(d.title || "Чек-листы", {
    body: d.body || "", data: { url: d.url || "/" }, tag: d.url || undefined, icon: "/static/m/icon-192.png", badge: "/static/m/icon-192.png",
  }));
});

self.addEventListener("notificationclick", e => {
  e.notification.close();
  let target = (e.notification.data && e.notification.data.url) || "/";
  // на телефоне (по User-Agent) открываем мобильную версию: /#/order/5 -> /m#/o/5
  const m = target.match(/#\/order\/(\d+)/);
  if (m && /Android|iPhone|iPad|iPod/i.test(self.navigator.userAgent)) target = "/m#/o/" + m[1];
  const url = new URL(target, self.location.origin).href;
  e.waitUntil(self.clients.matchAll({ type: "window", includeUncontrolled: true }).then(list => {
    for (const c of list) if ("focus" in c) { c.navigate(url); return c.focus(); }
    return self.clients.openWindow(url);
  }));
});