/// <reference types="@sveltejs/kit" />

import { build, files, version } from '$service-worker';

const cacheName = `ob-${version}`;

const assets = [...build, ...files, '/service-worker.js'];

self.addEventListener('install', (event) => {
  async function addToCache() {
    const cache = await caches.open(cacheName);
    await cache.addAll(assets);
  }

  event.waitUntil(addToCache());
});

self.addEventListener('activate', (event) => {
  async function deleteOldCache() {
    for (const key of await caches.keys()) {
      if (key !== cacheName) {
        await caches.delete(key);
      }
    }
  }

  event.waitUntil(deleteOldCache());
});

self.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') {
    return;
  }
  async function respond() {
    const cacheRes = await caches.match(event.request, { ignoreSearch: true });
    if (cacheRes) {
      return cacheRes;
    }

    try {
      return await fetch(event.request);
    } catch (err) {
      return { error: 'OFFLINE', errorMsg: 'You are not online' };
    }
  }

  event.respondWith(respond());
});