const CACHE_NAME = 'listify-shell-v1';
const SHELL_ASSETS = ['/', '/index.html', '/manifest.webmanifest', '/pwa-icon.svg'];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches
      .open(CACHE_NAME)
      .then((cache) => cache.addAll(SHELL_ASSETS))
      .then(() => 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)),
        ),
      )
      .then(() => self.clients.claim()),
  );
});

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

  if (url.origin !== self.location.origin || url.pathname.startsWith('/api/')) {
    return;
  }

  if (request.mode === 'navigate') {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put('/index.html', responseClone));
          return response;
        })
        .catch(() => caches.match('/index.html')),
    );
    return;
  }

  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) {
        return cached;
      }

      return fetch(request).then((response) => {
        if (request.method === 'GET' && response.ok) {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, responseClone));
        }

        return response;
      });
    }),
  );
});