// Minimal service worker — required for PWA installability.
// No caching: all requests pass through to the network.
// Exists solely so browsers recognize the site as installable
// (iOS/Android persist camera permissions after "Add to Home Screen").
//
// IMPORTANT: /hubs/ (SignalR) requests are excluded from interception entirely.
// Service worker fetch() wraps SSE/WebSocket responses in a buffered Response,
// which prevents real-time streaming — SignalR handshakes time out as a result.

const SKIP_PREFIXES = ['/hubs/', '/Kiosk/PollSession'];

self.addEventListener('install', () => self.skipWaiting());
self.addEventListener('activate', e => e.waitUntil(self.clients.claim()));

self.addEventListener('fetch', e => {
    const url = new URL(e.request.url);

    // Always skip cross-origin requests
    if (url.origin !== self.location.origin) return;

    // Skip SignalR hubs and kiosk polling — let the browser handle these directly
    if (SKIP_PREFIXES.some(p => url.pathname.startsWith(p))) return;

    // Passthrough: no caching, no modification
    e.respondWith(fetch(e.request));
});