/* ============================================================
   BAN YARO — Boot-Phase
   Offline-Banner + Service Worker Registration + Update-Flow
   Extrahiert aus index.html für CSP-Härtung (kein unsafe-inline)
   ============================================================ */

// ----------------------------------------------------------
// Offline-Banner
// ----------------------------------------------------------
(function() {
  function _updateBanner() {
    var banner = document.getElementById('offline-banner');
    if (!banner) return;
    banner.style.display = navigator.onLine ? 'none' : 'flex';
  }
  window.addEventListener('offline', function() {
    _updateBanner();
    // Einmaliger Hinweis pro Session: App im Vordergrund lassen
    if (!sessionStorage.getItem('by_offline_hint_shown')) {
      sessionStorage.setItem('by_offline_hint_shown', '1');
      setTimeout(function() {
        window.UI?.toast?.info(
          'App im Vordergrund lassen — so bleiben Offline-Funktionen wie GPS und Datenspeicherung aktiv.',
          8000
        );
      }, 800);
    }
    // Queue-Count abfragen
    if (navigator.serviceWorker) {
      navigator.serviceWorker.ready.then(function(reg) {
        if (reg.active) reg.active.postMessage({ type: 'QUEUE_COUNT' });
      });
    }
  });
  window.addEventListener('online', function() {
    _updateBanner();
    var badge = document.getElementById('offline-queue-badge');
    if (badge) badge.style.display = 'none';
    // Queue abarbeiten
    if (navigator.serviceWorker) {
      navigator.serviceWorker.ready.then(function(reg) {
        if (reg.active) reg.active.postMessage({ type: 'PROCESS_QUEUE' });
      });
    }
  });
  _updateBanner();
})();

// ----------------------------------------------------------
// Service Worker Registration + Update-Flow
// ----------------------------------------------------------
if ('serviceWorker' in navigator) {
  window.addEventListener('load', function() {
    navigator.serviceWorker.register('/sw.js', { updateViaCache: 'none' })
      .then(function(reg) {
        function _watchSW(sw) {
          if (!sw) return;
          sw.addEventListener('statechange', function() {
            if (sw.state === 'activated') {
              if (sessionStorage.getItem('by_skip_sw_reload')) {
                sessionStorage.removeItem('by_skip_sw_reload'); // einmalig konsumieren
                return;
              }
              window.location.replace('/?_t=' + Date.now());
            }
          });
        }
        reg.addEventListener('updatefound', function() { _watchSW(reg.installing); });
        if (reg.installing) _watchSW(reg.installing);
        reg.update();
      })
      .catch(function(err) { console.warn('SW Registration failed:', err); });
  });

  // App aus dem Hintergrund: erneut prüfen
  document.addEventListener('visibilitychange', function() {
    if (document.visibilityState === 'visible') {
      navigator.serviceWorker.getRegistration().then(function(reg) { if (reg) reg.update(); });
    }
  });

  // Backup: controllerchange falls updatefound nicht feuert
  // NICHT registrieren wenn diese Seite selbst durch SW-Reload entstand
  if (!window._BY_SW_RELOAD) {
    navigator.serviceWorker.addEventListener('controllerchange', function() {
      if (sessionStorage.getItem('by_skip_sw_reload')) {
        sessionStorage.removeItem('by_skip_sw_reload');
        return;
      }
      window.location.replace('/?_t=' + Date.now());
    });
  }

  navigator.serviceWorker.addEventListener('message', function(e) {
    if (e.data && e.data.type === 'QUEUE_PROCESSED') {
      var synced = e.data.synced, failed = e.data.failed, total = e.data.total;
      if (total === 0) return;
      if (synced > 0 && window.UI && window.UI.toast) {
        window.UI.toast.success(
          synced === 1
            ? '1 offline gespeicherter Eintrag synchronisiert'
            : synced + ' offline gespeicherte Einträge synchronisiert'
        );
        if (window.App && window.App.state && window.pages) {
          var p = window.pages[window.App.state.page];
          if (p && p.module && p.module.refresh) p.module.refresh();
        }
      }
      if (failed > 0 && window.UI && window.UI.toast) {
        window.UI.toast.warning(failed + ' Eintrag' + (failed > 1 ? 'e' : '') + ' noch nicht synchronisiert — kein Netz');
      }
      return;
    }
    if (e.data && e.data.type === 'QUEUE_COUNT') {
      var badge = document.getElementById('offline-queue-badge');
      if (badge) {
        if (e.data.count > 0) {
          badge.textContent = e.data.count;
          badge.style.display = '';
        } else {
          badge.style.display = 'none';
        }
      }
      return;
    }
    if (e.data && e.data.type === 'CHECK_NEARBY_ALERTS') {
      if (window.App && window.App._checkNearbyAlerts) window.App._checkNearbyAlerts();
    }
  });
}