// Ten31 Portal service worker. Deliberately conservative so it never serves a stale app:
// - navigations are network-first (always get the latest index.html), cache only as offline fallback
// - content-hashed /assets/* are cache-first (immutable, safe forever)
// - /api/* is never cached
// Bump CACHE on each release so old entries are purged.
const CACHE = 'ten31-portal-0.2.45'

self.addEventListener('install', () => self.skipWaiting())

self.addEventListener('activate', (event) => {
  event.waitUntil(
    (async () => {
      const keys = await caches.keys()
      await Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
      await self.clients.claim()
    })(),
  )
})

self.addEventListener('fetch', (event) => {
  const req = event.request
  if (req.method !== 'GET') return
  const url = new URL(req.url)
  if (url.origin !== self.location.origin) return
  if (url.pathname.startsWith('/api/')) return

  if (req.mode === 'navigate') {
    event.respondWith(
      (async () => {
        try {
          const fresh = await fetch(req)
          const cache = await caches.open(CACHE)
          cache.put('/', fresh.clone())
          return fresh
        } catch {
          const cache = await caches.open(CACHE)
          return (await cache.match('/')) || Response.error()
        }
      })(),
    )
    return
  }

  if (url.pathname.startsWith('/assets/')) {
    event.respondWith(
      (async () => {
        const cache = await caches.open(CACHE)
        const hit = await cache.match(req)
        if (hit) return hit
        const res = await fetch(req)
        if (res.ok) cache.put(req, res.clone())
        return res
      })(),
    )
  }
})