const CACHE_NAME = 'bitbybit-cad-shell-v1'
const SHELL = ['/','/index.html','/manifest.webmanifest']

self.addEventListener('install', (event) => {
  event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL)).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) => {
  if (event.request.method !== 'GET' || new URL(event.request.url).origin !== self.location.origin) return
  event.respondWith(fetch(event.request).then((response) => {
    if (response.ok) void caches.open(CACHE_NAME).then((cache) => cache.put(event.request, response.clone()))
    return response
  }).catch(() => caches.match(event.request).then((cached) => cached || caches.match('/index.html'))))
})