const CACHE = "tym-v1.0.1";
const ASSETS = [
  "/",
  "/index.html",
  "/styles.css",
  "/app.js",
  "/manifest.json",
  "/version.json",
  "/icon.png",
  "/icon-192x192.png",
  "/icon-512x512.png",
  "/lib/api.js",
  "/lib/auth.js",
  "/lib/badge.js",
  "/lib/offlineQueue.js",
  "/lib/pwa.js",
  "/lib/ui.js",
];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE).then((c) => c.addAll(ASSETS)).then(() => self.skipWaiting())
  );
});

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

self.addEventListener("fetch", (event) => {
  const { request } = event;
  if (request.method !== "GET") return;
  const url = new URL(request.url);
  if (url.origin !== self.location.origin) return;

  if (url.pathname.startsWith("/api/")) {
    event.respondWith(fetch(request).catch(() => new Response(JSON.stringify({ offline: true }), {
      status: 503, headers: { "Content-Type": "application/json" },
    })));
    return;
  }

  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request).catch(() => caches.match("/index.html"))
    );
    return;
  }

  event.respondWith(
    caches.match(request, { ignoreSearch: true }).then((cached) =>
      cached || fetch(request).then((resp) => {
        if (resp.ok) {
          const clone = resp.clone();
          caches.open(CACHE).then((c) => c.put(request, clone));
        }
        return resp;
      })
    )
  );
});

self.addEventListener("push", (event) => {
  if (!event.data) return;
  let data = {};
  try { data = event.data.json(); } catch { data = { body: event.data.text() }; }

  const options = {
    body: data.body || "Med-Time!",
    icon: "/icon-192x192.png",
    badge: "/icon-72x72.png",
    silent: data.silent !== false,
    tag: data.tag || "med-reminder",
    renotify: true,
    data: { slot_id: data.slot_id },
    actions: [
      { action: "take", title: "Genommen ✓" },
      { action: "snooze15", title: "+15 Min" },
      { action: "snooze30", title: "+30 Min" },
    ],
  };

  event.waitUntil(
    self.registration.showNotification(data.title || "TakeYourMeds", options)
  );
});

async function apiPost(path, body) {
  const clients = await self.clients.matchAll({ type: "window" });
  for (const client of clients) {
    client.postMessage({ type: "API_ACTION", path, body });
    return;
  }
}

self.addEventListener("notificationclick", (event) => {
  event.notification.close();
  const slotId = event.notification.data?.slot_id;
  const action = event.action;

  if (action === "take" && slotId) {
    event.waitUntil(
      self.clients.openWindow(`/?action=take&slot=${slotId}`)
    );
    return;
  }

  if ((action === "snooze15" || action === "snooze30") && slotId) {
    const minutes = action === "snooze15" ? 15 : 30;
    event.waitUntil(
      self.clients.openWindow(`/?action=snooze&slot=${slotId}&minutes=${minutes}`)
    );
    return;
  }

  event.waitUntil(self.clients.openWindow("/"));
});

self.addEventListener("sync", (event) => {
  if (event.tag === "sync-logs") {
    event.waitUntil(
      self.clients.matchAll().then((list) => {
        list.forEach((c) => c.postMessage({ type: "SYNC_QUEUE" }));
      })
    );
  }
});