const CACHE_NAME = "wtr-shell-v5";
const SHELL = [
  "/",
  "/settings",
  "/offline",
  "/manifest.json",
  "/icons/icon.svg",
  "/icons/maskable.svg",
  "/icons/icon-192.png",
  "/icons/icon-512.png",
  "/icons/maskable-512.png",
];

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

self.addEventListener("activate", (event) => {
  event.waitUntil(
    caches
      .keys()
      .then((keys) => Promise.all(keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key)))),
  );
  self.clients.claim();
});

self.addEventListener("fetch", (event) => {
  if (event.request.method !== "GET") return;
  const url = new URL(event.request.url);
  if (
    url.pathname.startsWith("/api/imgw/") ||
    url.pathname === "/api/imgw-current" ||
    url.pathname === "/api/current-weather" ||
    url.pathname === "/api/forecast"
  ) {
    event.respondWith(
      fetch(event.request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(event.request, copy));
          return response;
        })
        .catch(() => caches.match(event.request)),
    );
    return;
  }
  if (event.request.mode === "navigate") {
    event.respondWith(
      fetch(event.request).catch(() =>
        caches.match(event.request).then((response) => response || caches.match("/offline")),
      ),
    );
  }
});

self.addEventListener("push", (event) => {
  const fallbackPayload = {
    title: "IMGW",
    body: "Nowe ostrzeżenie meteorologiczne.",
    url: "/warnings",
  };
  let payload = fallbackPayload;
  if (event.data) {
    const text = event.data.text();
    try {
      payload = { ...fallbackPayload, ...JSON.parse(text) };
    } catch {
      payload = { ...fallbackPayload, body: text };
    }
  }

  event.waitUntil(
    self.registration.showNotification(payload.title, {
      body: payload.body,
      icon: "/icons/icon-192.png",
      badge: "/icons/icon-192.png",
      data: { url: payload.url || "/warnings" },
    }),
  );
});

self.addEventListener("notificationclick", (event) => {
  event.notification.close();
  const targetUrl = new URL(event.notification.data?.url || "/warnings", self.location.origin).href;

  event.waitUntil(
    self.clients.matchAll({ type: "window", includeUncontrolled: true }).then((clients) => {
      const existingClient = clients.find((client) => client.url === targetUrl);
      if (existingClient) return existingClient.focus();
      return self.clients.openWindow(targetUrl);
    }),
  );
});