// مظنه — service worker (slice 11, پ۱۱-۲). served by App\Http\Controllers\AppShellController::serviceWorker.
// it keeps ONLY the shell and NEVER a price or an order answer: a stale price is wrong money.
//  · a page (navigation)      ⇒ always the network; only when the network is gone, the kept «اتصال نیست» page
//  · a file of the shell      ⇒ the kept copy (the build's names are hashed, so a kept file never goes stale)
//  · everything else          ⇒ not touched: JSON reads, every POST, other origins go straight to the network
const VERSION = {!! $versionJson !!};
const CACHE = 'mz-shell-' + VERSION;
const OFFLINE = '/offline';
const SHELL = {!! $shellJson !!};

self.addEventListener('install', (event) => {
    event.waitUntil(
        caches.open(CACHE)
            // credentials omitted: the kept copies are the same for every person on this device
            .then((cache) => cache.addAll(SHELL.map((url) => new Request(url, { credentials: 'omit', cache: 'reload' }))))
            .then(() => self.skipWaiting()),
    );
});

self.addEventListener('activate', (event) => {
    event.waitUntil(
        caches.keys()
            .then((keys) => Promise.all(keys.filter((key) => key.startsWith('mz-shell-') && key !== CACHE).map((key) => caches.delete(key))))
            .then(() => self.clients.claim()),
    );
});

const shellPaths = new Set(SHELL.map((url) => new URL(url, self.location.origin).pathname + new URL(url, self.location.origin).search));

self.addEventListener('fetch', (event) => {
    const request = event.request;
    if (request.method !== 'GET') {
        return;
    }
    const url = new URL(request.url);
    if (url.origin !== self.location.origin) {
        return;
    }
    if (request.mode === 'navigate') {
        event.respondWith(fetch(request).catch(() => caches.match(OFFLINE, { cacheName: CACHE })));
        return;
    }
    if (url.pathname !== OFFLINE && shellPaths.has(url.pathname + url.search)) {
        event.respondWith(caches.match(request, { cacheName: CACHE }).then((kept) => kept || fetch(request)));
    }
});