/* Neon Survivors — service worker (cache-first, versioned) */
'use strict';
const CACHE = 'neon-survivors-v1';
const ASSETS = [
  './',
  './index.html',
  './manifest.webmanifest',
  './css/style.css',
  './icons/icon-192.png',
  './icons/icon-512.png',
  './js/util.js',
  './js/i18n.js',
  './js/save.js',
  './js/audio.js',
  './js/data.js',
  './js/entities.js',
  './js/systems.js',
  './js/render.js',
  './js/ui.js',
  './js/game.js',
  './js/main.js'
];

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

self.addEventListener('activate', (e) => {
  e.waitUntil(
    caches.keys()
      .then(keys => Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k))))
      .then(() => self.clients.claim())
  );
});

self.addEventListener('fetch', (e) => {
  if (e.request.method !== 'GET') return;
  const url = new URL(e.request.url);
  if (url.origin !== location.origin) return;
  e.respondWith(
    caches.match(e.request, { ignoreSearch: true }).then(hit =>
      hit || fetch(e.request).then(res => {
        const copy = res.clone();
        caches.open(CACHE).then(c => c.put(e.request, copy));
        return res;
      }).catch(() => hit)
    )
  );
});