// PWA Service Worker v3
// - /api /auth /admin /sync 一律直连，绝不缓存（修复切换账号后 /auth/me 命中旧缓存的问题）
// - 仅指纹化静态资源（/assets/、/icons/）缓存优先
// - 页面导航网络优先，离线回落缓存的 index.html
const CACHE = 'fp-static-v3';
const CORE = ['/manifest.webmanifest', '/icons/pwa-192.png', '/icons/pwa-512.png'];

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

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

self.addEventListener('fetch', (e) => {
  const url = new URL(e.request.url);
  if (e.request.method !== 'GET') return;
  // 后端接口直连（含 /api /auth /admin /sync），绝不缓存
  if (/^\/(api|auth|admin|sync)(\/|$)/.test(url.pathname)) return;

  // 指纹化静态资源：缓存优先（内容不可变）
  if (url.pathname.startsWith('/assets/') || url.pathname.startsWith('/icons/')) {
    e.respondWith(
      caches.match(e.request).then((hit) => hit || fetch(e.request).then((res) => {
        if (res.ok && url.origin === location.origin) {
          const copy = res.clone();
          caches.open(CACHE).then((c) => c.put(e.request, copy));
        }
        return res;
      }))
    );
    return;
  }

  // 页面导航：网络优先，离线回落
  if (e.request.mode === 'navigate') {
    e.respondWith(
      fetch(e.request).then((res) => {
        const copy = res.clone();
        caches.open(CACHE).then((c) => c.put('/index.html', copy));
        return res;
      }).catch(() => caches.match('/index.html').then((h) => h || caches.match('/')))
    );
    return;
  }
  // 其余（manifest 等）：网络直连
});