/**
 * diora service worker — caches the app shell for offline use.
 */

const CACHE = 'diora-v163';
const SHELL = [
  '/static/css/app.css',
  '/static/js/app/01-core.js',
  '/static/js/app/10-radio.js',
  '/static/js/app/14-focus.js',
  '/static/js/app/16-stations.js',
  '/static/js/app/20-tabs.js',
  '/static/js/app/24-ambient.js',
  '/static/js/app/26-sidebar.js',
  '/static/js/app/28-serviceworker.js',
  '/static/js/app/29-m3u.js',
  '/static/js/app/30-contrast.js',
  '/static/js/app/32-crypto.js',
  '/static/js/app/33-unlock.js',
  '/static/js/app/34-wallpaper.js',
  '/static/js/app/40-epub.js',
  '/static/js/app/44-books.js',
  '/static/js/app/46-readpos.js',
  '/static/js/app/48-book-cache.js',
  '/static/js/app/50-reader-state.js',
  '/static/js/app/52-book-list.js',
  '/static/js/app/53-library.js',
  '/static/js/app/54-issues.js',
  '/static/js/app/55-library-tools.js',
  '/static/js/app/56-cloud-import.js',
  '/static/js/app/57-cloud-inbox.js',
  '/static/js/app/58-pdf.js',
  '/static/js/app/60-tts.js',
  '/static/js/app/62-reader.js',
  '/static/js/app/63-pages.js',
  '/static/js/app/65-article.js',
  '/static/js/app/64-reader-settings.js',
  '/static/js/app/66-pdf-paginated.js',
  '/static/js/app/68-bookmarks.js',
  '/static/js/app/70-search.js',
  '/static/js/app/72-highlights.js',
  '/static/js/app/74-margin.js',
  '/static/js/app/76-export.js',
  '/static/js/app/78-footnotes.js',
  '/static/js/app/80-radio-sidebar.js',
  '/static/js/app/99-init.js',
  '/static/js/podcasts-web.js',
  '/static/js/home.js',
  '/static/js/feeds.js',
  '/static/js/audiobooks.js',
  '/static/js/nav.js',
  '/static/js/folders.js',
  '/static/js/covers.js',
  '/static/js/gencover.js',
  '/static/js/sources.js',
  '/static/js/search.js',
  '/static/js/projects.js',
  '/static/podcasts/native-podcast.js',
  '/static/podcasts/podcast-ui.css',
  '/static/podcasts/podcasts-web.css',
  '/static/manifest.json',
  '/static/ambient/index.html',
  '/static/fonts/SourceSerif4-normal-latin.woff2',
  '/static/fonts/SourceSerif4-normal-latin-ext.woff2',
  '/static/fonts/SourceSerif4-italic-latin.woff2',
  '/static/fonts/SourceSerif4-italic-latin-ext.woff2',
];

// Install: pre-cache the app shell
self.addEventListener('install', function (event) {
  event.waitUntil(
    caches.open(CACHE).then(function (cache) {
      return cache.addAll(SHELL);
    })
  );
  // Activate immediately without waiting for old tabs to close
  self.skipWaiting();
});

// Activate: remove stale caches from previous versions (also the old
// 'diora-podcast-v1' of episodes the web app used to download)
self.addEventListener('activate', function (event) {
  event.waitUntil(
    caches.keys().then(function (keys) {
      return Promise.all(
        keys.filter(function (key) { return key !== CACHE; })
            .map(function (key) { return caches.delete(key); })
      );
    }).then(function () {
      return self.clients.claim();
    }).then(function () {
      // Tell all open tabs to reload so they get the latest cached assets
      return self.clients.matchAll({type: 'window'}).then(function (clients) {
        clients.forEach(function (client) {
          client.postMessage({type: 'SW_ACTIVATED'});
        });
      });
    })
  );
});

// Fetch: serve from cache, fall back to network
self.addEventListener('fetch', function (event) {
  // Only handle GET requests; let POST/SSE etc. pass through
  if (event.request.method !== 'GET') return;

  const url = new URL(event.request.url);

  // Bypass for API/mutation endpoints
  if (url.pathname.startsWith('/radio/sse/') ||
      url.pathname.startsWith('/radio/record/') ||
      url.pathname.startsWith('/radio/affiliate/') ||
      url.pathname.startsWith('/tts/') ||
      url.pathname.startsWith('/admin/') ||
      url.pathname.startsWith('/podcasts/progress/') ||
      url.pathname.startsWith('/podcasts/queue/') ||
      url.pathname.startsWith('/podcasts/player/') ||
      url.pathname === '/podcasts/feeds/add' ||
      url.pathname.startsWith('/podcasts/feeds/add') ||
      url.pathname.includes('/remove') ||
      url.pathname.startsWith('/podcasts/feeds/refresh')) {
    return;
  }

  // Cache-first for pre-defined shell assets
  const isShell = SHELL.some(function (s) { return url.pathname === s; });
  if (isShell) {
    event.respondWith(
      // ignoreSearch: the Ambient frame loads with ?embed=1&bg=…
      caches.match(event.request, {ignoreSearch: true}).then(function (cached) {
        return cached || fetch(event.request);
      })
    );
    return;
  }

  // Navigation requests (the HTML page itself): network-first, fall back to
  // last cached version so the app opens offline after being visited once.
  if (event.request.mode === 'navigate') {
    event.respondWith(
      fetch(event.request).then(function (response) {
        if (response.ok) {
          var clone = response.clone();
          caches.open(CACHE).then(function (cache) { cache.put(event.request, clone); });
        }
        return response;
      }).catch(function () {
        return caches.match(event.request);
      })
    );
  }
});