/// <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());
})