const CACHE_NAME = 'traveler-tools-v1';
const ASSETS = ['./', 'index.html', 'traveler-tools.js', '../shared.css', 'manifest.webmanifest'];

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

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

self.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') return;
  event.respondWith(caches.match(event.request).then((cached) => cached || fetch(event.request)));
});