// Nodmix Control – Service Worker
// Handles offline caching and push notifications.

const CACHE_PREFIX = "nodmix-control-";
const EMBEDDED_CACHE_VERSION = "2026.5.30-60c783c4cf0b";
const URL_CACHE_VERSION = new URL(self.location.href).searchParams
  .get("v")
  ?.replace(/[^a-zA-Z0-9._-]/g, "-");
const CACHE_VERSION =
  (EMBEDDED_CACHE_VERSION !== "__NODMIX_CONTROL_UI_BUILD_ID__"
    ? EMBEDDED_CACHE_VERSION
    : URL_CACHE_VERSION) || "dev";
const CACHE_NAME = `${CACHE_PREFIX}${CACHE_VERSION}`;
const CONTROL_CACHE_LIMIT = 3;

// Minimal app-shell files to precache.
const PRECACHE_URLS = ["./"];

self.addEventListener("install", (event) => {
  event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(PRECACHE_URLS)));
  self.skipWaiting();
});

self.addEventListener("activate", (event) => {
  // Keep a small prior-build window so open tabs can still load old hashed chunks after updates.
  event.waitUntil(
    Promise.all([
      self.clients.claim(),
      caches.keys().then((keys) => {
        const controlKeys = keys.filter((key) => key.startsWith(CACHE_PREFIX));
        const priorCacheLimit = Math.max(0, CONTROL_CACHE_LIMIT - 1);
        const retained = new Set([
          ...controlKeys.filter((key) => key !== CACHE_NAME).slice(-priorCacheLimit),
          CACHE_NAME,
        ]);
        return Promise.all(
          controlKeys.filter((key) => !retained.has(key)).map((key) => caches.delete(key)),
        );
      }),
    ]),
  );
});

self.addEventListener("fetch", (event) => {
  const url = new URL(event.request.url);

  // Skip non-GET and cross-origin requests.
  if (event.request.method !== "GET" || url.origin !== self.location.origin) {
    return;
  }

  // Skip non-UI routes — API, RPC, and plugin routes should never be cached.
  if (
    url.pathname.startsWith("/api/") ||
    url.pathname.startsWith("/rpc") ||
    url.pathname.startsWith("/plugins/")
  ) {
    return;
  }

  // Cache-first for hashed assets; network-first for HTML/other.
  if (url.pathname.includes("/assets/")) {
    event.respondWith(
      caches.match(event.request).then(
        (cached) =>
          cached ||
          fetch(event.request).then((response) => {
            if (response.ok) {
              const clone = response.clone();
              void caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
            }
            return response;
          }),
      ),
    );
  } else {
    event.respondWith(
      fetch(event.request)
        .then((response) => {
          if (response.ok) {
            const clone = response.clone();
            void caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
          }
          return response;
        })
        .catch(() => caches.match(event.request)),
    );
  }
});

// --- Web Push ---

self.addEventListener("push", (event) => {
  if (!event.data) {
    return;
  }

  let data;
  try {
    data = event.data.json();
  } catch {
    data = { title: "Nodmix", body: event.data.text() };
  }

  const title = data.title || "Nodmix";
  const options = {
    body: data.body || "",
    icon: "./apple-touch-icon.png",
    badge: "./favicon-32.png",
    tag: data.tag || "nodmix-notification",
    data: { url: data.url || "./" },
  };

  event.waitUntil(self.registration.showNotification(title, options));
});

self.addEventListener("notificationclick", (event) => {
  event.notification.close();

  const targetUrl = event.notification.data?.url || "./";

  event.waitUntil(
    self.clients.matchAll({ type: "window", includeUncontrolled: true }).then((clients) => {
      // Focus an existing window if one is open.
      for (const client of clients) {
        if (new URL(client.url).pathname === new URL(targetUrl, self.location.origin).pathname) {
          return client.focus();
        }
      }
      return self.clients.openWindow(targetUrl);
    }),
  );
});
