'use strict';

// ---------------------------------------------------------------------------
// Service Worker
// ---------------------------------------------------------------------------

if ('serviceWorker' in navigator) {
  window.addEventListener('load', () => {
    // Registered from '/sw.js' (root), not '/static/js/sw.js': a service
    // worker's default scope is its own script's directory, so registering
    // it from under /static/js/ would only ever let it control requests
    // under that path — page navigations to '/', '/books/' etc. would never
    // be intercepted, breaking offline entirely.
    navigator.serviceWorker.register('/sw.js', {scope: '/'}).catch(err => {
      console.warn('Service worker registration failed:', err);
    });
    // Drop any leftover registration from the old, wrongly-scoped '/static/js/sw.js'
    // path so it doesn't keep running or fight the new root-scoped worker.
    navigator.serviceWorker.getRegistrations().then(regs => {
      regs.forEach(r => { if (r.scope.endsWith('/static/js/')) r.unregister(); });
    });
  });
  // When a new SW activates it sends SW_ACTIVATED — reload to get fresh assets,
  // but never in the middle of something: not while a book is open, radio or a
  // podcast plays, or a text field has the focus — then as soon as that's over.
  let reloadPending = false;
  const busy = () => {
    if (currentBookId || isPlaying) return true;
    const host = window.DioraPodcastHost;
    if (host && host.playerState) {
      try { if (JSON.parse(host.playerState()).playing) return true; } catch (_) {}
    }
    const el = document.activeElement;
    return !!el && (el.isContentEditable || /^(INPUT|TEXTAREA|SELECT)$/.test(el.tagName));
  };
  const reloadWhenIdle = () => {
    if (busy()) setTimeout(reloadWhenIdle, 5000);
    else window.location.reload();
  };
  navigator.serviceWorker.addEventListener('message', e => {
    if (e.data?.type === 'SW_ACTIVATED' && !reloadPending) {
      reloadPending = true;
      reloadWhenIdle();
    }
  });
}