// service worker for dark furrow
// the almanac should work like a book you own, not a service you rent.

var CACHE_NAME = 'dark-furrow-v2';

var CORE_ASSETS = [
  '/',
  '/static/style.css',
  '/static/almanac.js',
  '/static/favicon.svg',
  '/static/og.svg'
];

self.addEventListener('install', function (event) {
  event.waitUntil(
    caches.open(CACHE_NAME).then(function (cache) {
      return cache.addAll(CORE_ASSETS);
    }).then(function () {
      return self.skipWaiting();
    })
  );
});

self.addEventListener('activate', function (event) {
  event.waitUntil(
    caches.keys().then(function (names) {
      return Promise.all(
        names.filter(function (name) { return name !== CACHE_NAME; })
             .map(function (name) { return caches.delete(name); })
      );
    }).then(function () {
      return self.clients.claim();
    })
  );
});

self.addEventListener('fetch', function (event) {
  event.respondWith(
    fetch(event.request).then(function (response) {
      if (response.ok) {
        var clone = response.clone();
        caches.open(CACHE_NAME).then(function (cache) {
          cache.put(event.request, clone);
        });
      }
      return response;
    }).catch(function () {
      return caches.match(event.request);
    })
  );
});