const CACHE = 'cortex-v2';

const PRECACHE = [
    '/static/style.css',
    '/static/app.js',
    '/static/marked.min.js',
    '/static/icon-192.png',
    '/static/icon-512.png',
    '/static/icon.svg',
    '/static/manifest.json',
];

self.addEventListener('install', evt => {
    evt.waitUntil(
        caches.open(CACHE)
            .then(c => c.addAll(PRECACHE))
            .then(() => self.skipWaiting())
    );
});

self.addEventListener('activate', evt => {
    evt.waitUntil(
        caches.keys()
            .then(keys => Promise.all(
                keys.filter(k => k !== CACHE).map(k => caches.delete(k))
            ))
            .then(() => self.clients.claim())
    );
});

self.addEventListener('push', evt => {
    let data = { title: 'Cortex', body: '', url: '/' };
    if (evt.data) {
        try { data = { ...data, ...evt.data.json() }; } catch (_) {}
    }
    evt.waitUntil(
        self.registration.showNotification(data.title, {
            body: data.body,
            icon: '/static/icon-192.png',
            badge: '/static/icon-192.png',
            data: { url: data.url },
        })
    );
});

self.addEventListener('notificationclick', evt => {
    evt.notification.close();
    const url = evt.notification.data?.url || '/';
    evt.waitUntil(
        clients.matchAll({ type: 'window', includeUncontrolled: true }).then(list => {
            for (const c of list) {
                if (c.url.includes(self.location.origin) && 'focus' in c) {
                    c.navigate(url);
                    return c.focus();
                }
            }
            if (clients.openWindow) return clients.openWindow(url);
        })
    );
});

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

    // Only handle same-origin GETs
    if (evt.request.method !== 'GET' || url.origin !== self.location.origin) return;

    // Never intercept streaming or API calls
    if (
        url.pathname.startsWith('/chat') ||
        url.pathname.startsWith('/orchestrate') ||
        url.pathname.startsWith('/api/') ||
        url.pathname.startsWith('/distill') ||
        url.pathname.startsWith('/webhook') ||
        url.pathname.startsWith('/auth/')
    ) return;

    // Static assets — cache first, refresh in background (stale-while-revalidate)
    if (url.pathname.startsWith('/static/')) {
        evt.respondWith(
            caches.open(CACHE).then(cache =>
                cache.match(evt.request).then(cached => {
                    const network = fetch(evt.request).then(resp => {
                        if (resp.ok) cache.put(evt.request, resp.clone());
                        return resp;
                    });
                    return cached || network;
                })
            )
        );
        return;
    }

    // HTML pages — network first, cached shell fallback
    evt.respondWith(
        fetch(evt.request)
            .then(resp => {
                if (resp.ok) {
                    const clone = resp.clone();
                    caches.open(CACHE).then(c => c.put(evt.request, clone));
                }
                return resp;
            })
            .catch(() => caches.match(evt.request))
    );
});