const version = '0.6.2'
const consolePrefix = `[SW v${version}]  `

const cacheName = `hvvstuhl-${version}`;
const contentToCache = [
    '/',
    '/index.html',
    '/about.html',
    '/main.js',
    '/elevators.js',
    '/style.css',
    '/icons/192.png',
    '/icons/512.png',
    '/icons/512-maskable.png',
    '/icons/512-transparent.png',
    '/icons/favicon.ico',
    '/icons/favicon.svg',
    '/icons/favicon-maskable.svg',
    '/icons/favicon-transparent.svg',
    '/md_icons/bicycle.svg',
    '/md_icons/braille.svg',
    '/md_icons/door_sliding.svg',
    '/md_icons/elevator.svg',
    '/md_icons/elevator-slash.svg',
    '/md_icons/fit_width.svg',
    '/md_icons/height.svg',
    '/md_icons/info.svg',
    '/md_icons/load.svg',
    '/md_icons/location.svg',
    '/md_icons/location-searching.svg',
    '/md_icons/speaker.svg',
    '/md_icons/up-down.svg',
    '/md_icons/wheelchair.svg',
    '/md_icons/width.svg',
];

// Service worker Install: Cache all files
self.addEventListener("install", (e) => {
    console.log("[Service Worker] Wird installiert....");
    e.waitUntil(
        (async () => {
            const cache = await caches.open(cacheName);
            console.log("[Service Worker]   Cache wird aufgebaut...");
            await cache.addAll(contentToCache);
            console.log("[Service Worker]   FERTIG");
        })(),
    );
});


// delete old caches
const deleteCache = async (key) => {
    await caches.delete(key);
};
const deleteOldCaches = async () => {
    const keyList = await caches.keys();
    const cachesToDelete = keyList.filter((key) => key !== cacheName);
    await Promise.all(cachesToDelete.map(deleteCache));
};
self.addEventListener("activate", (event) => {
    event.waitUntil(
        (async () => {
            await deleteOldCaches()
            await clients.claim();
        })(),
    );
});



// Respond with data from cache when offline
self.addEventListener("fetch", (e) => {
    e.respondWith(
        (async () => {
            const path = new URL(e.request.url).pathname

            if(contentToCache.includes(path)){
                console.log(`${consolePrefix}Anfrage: ${path}`);

                const r = await caches.match(e.request);
                if (r) {
                    console.log(`${consolePrefix}  Im Cache gefunden.`);
                    return r;
                }
                const response = await fetch(e.request);
                const cache = await caches.open(cacheName);
                console.log(`${consolePrefix}  Nicht gefunden. Aktualisiere Cache: ${path}`);
                await cache.put(e.request, response.clone());
                return response;
            }else{
                console.log(`${consolePrefix}Anfrage übersprungen: ${e.request.url}`);
                return await fetch(e.request);
            }
        })(),
    );
});