manage-your-printer/static/js/css-cache-service-worker.min.js

const CACHE_NAME='myp-css-cache-v1.0';const CSS_CACHE_NAME='myp-css-resources-v1.0';const CRITICAL_CSS_RESOURCES=['/static/css/caching-optimizations.css','/static/css/optimization-animations.css','/static/css/glassmorphism.css','/static/css/professional-theme.css','/static/css/tailwind.min.css'];const NON_CRITICAL_CSS_RESOURCES=['/static/css/components.css','/static/css/printers.css','/static/fontawesome/css/all.min.css'];const CSS_CACHE_CONFIG={maxAge:24*60*60*1000,maxEntries:50,networkTimeoutSeconds:5};self.addEventListener('install',event=>{console.log('[CSS-SW] Service Worker wird installiert...');event.waitUntil(caches.open(CSS_CACHE_NAME).then(cache=>{console.log('[CSS-SW] Kritische CSS-Ressourcen werden gecacht...');return cache.addAll(CRITICAL_CSS_RESOURCES);}).then(()=>{console.log('[CSS-SW] Installation abgeschlossen');return self.skipWaiting();}).catch(error=>{console.error('[CSS-SW] Fehler bei Installation:',error);}));});self.addEventListener('activate',event=>{console.log('[CSS-SW] Service Worker wird aktiviert...');event.waitUntil(caches.keys().then(cacheNames=>{return Promise.all(cacheNames.map(cacheName=>{if(cacheName!==CACHE_NAME&&cacheName!==CSS_CACHE_NAME){console.log('[CSS-SW] Alter Cache wird gelöscht:',cacheName);return caches.delete(cacheName);}}));}).then(()=>{console.log('[CSS-SW] Aktivierung abgeschlossen');return self.clients.claim();}).then(()=>{return prefetchNonCriticalResources();}));});self.addEventListener('fetch',event=>{const{request}=event;if(!request.url.includes('.css')&&!request.url.includes('/static/css/')){return;}
event.respondWith(handleCSSRequest(request));});async function handleCSSRequest(request){const url=new URL(request.url);try{const cachedResponse=await caches.match(request);if(cachedResponse){console.log('[CSS-SW] Cache-Hit für:',url.pathname);if(CRITICAL_CSS_RESOURCES.some(resource=>url.pathname.includes(resource))){updateCacheInBackground(request);}
return cachedResponse;}
const networkResponse=await fetchWithTimeout(request,CSS_CACHE_CONFIG.networkTimeoutSeconds*1000);if(networkResponse&&networkResponse.ok){const responseToCache=networkResponse.clone();cacheResponse(request,responseToCache);console.log('[CSS-SW] Network-Response für:',url.pathname);return networkResponse;}
return await getFallbackCSS(request);}catch(error){console.error('[CSS-SW] Fehler bei CSS-Request:',error);return await getFallbackCSS(request);}}
function fetchWithTimeout(request,timeout){return new Promise((resolve,reject)=>{const timer=setTimeout(()=>{reject(new Error('Network timeout'));},timeout);fetch(request).then(response=>{clearTimeout(timer);resolve(response);}).catch(error=>{clearTimeout(timer);reject(error);});});}
async function cacheResponse(request,response){try{const cache=await caches.open(CSS_CACHE_NAME);await cache.put(request,response);await maintainCacheSize();}catch(error){console.error('[CSS-SW] Fehler beim Cachen:',error);}}
async function maintainCacheSize(){try{const cache=await caches.open(CSS_CACHE_NAME);const requests=await cache.keys();if(requests.length>CSS_CACHE_CONFIG.maxEntries){console.log('[CSS-SW] Cache-Bereinigung wird durchgeführt...');const excessCount=requests.length-CSS_CACHE_CONFIG.maxEntries;for(let i=0;i<excessCount;i++){await cache.delete(requests[i]);}}}catch(error){console.error('[CSS-SW] Fehler bei Cache-Wartung:',error);}}
async function updateCacheInBackground(request){try{const response=await fetch(request);if(response&&response.ok){const cache=await caches.open(CSS_CACHE_NAME);await cache.put(request,response.clone());console.log('[CSS-SW] Hintergrund-Update für:',request.url);}}catch(error){console.log('[CSS-SW] Hintergrund-Update fehlgeschlagen:',error);}}
async function getFallbackCSS(request){const url=new URL(request.url);const fallbackCSS=`body{font-family:system-ui,sans-serif;margin:0;padding:20px;background:#f8fafc;color:#1f2937;}.offline-notice{background:#fef3c7;border:1px solid#f59e0b;border-radius:8px;padding:16px;margin-bottom:20px;text-align:center;}.btn{background:#0073ce;color:white;border:none;padding:8px 16px;border-radius:4px;cursor:pointer;}.card{background:white;border:1px solid#e5e7eb;border-radius:8px;padding:16px;margin-bottom:16px;}`;return new Response(fallbackCSS,{headers:{'Content-Type':'text/css','Cache-Control':'no-cache'}});}
async function prefetchNonCriticalResources(){try{const cache=await caches.open(CSS_CACHE_NAME);for(const resource of NON_CRITICAL_CSS_RESOURCES){try{const request=new Request(resource);const cachedResponse=await cache.match(request);if(!cachedResponse){const response=await fetch(request);if(response&&response.ok){await cache.put(request,response);console.log('[CSS-SW] Prefetch erfolgreich für:',resource);}}}catch(error){console.log('[CSS-SW] Prefetch fehlgeschlagen für:',resource);}}}catch(error){console.error('[CSS-SW] Fehler beim Prefetching:',error);}}
self.addEventListener('message',event=>{const{type,data}=event.data;switch(type){case'SKIP_WAITING':self.skipWaiting();break;case'CLEAR_CSS_CACHE':clearCSSCache().then(()=>{event.ports[0].postMessage({success:true});});break;case'PREFETCH_CSS':prefetchSpecificCSS(data.urls).then(()=>{event.ports[0].postMessage({success:true});});break;case'GET_CACHE_STATS':getCacheStats().then(stats=>{event.ports[0].postMessage(stats);});break;}});async function clearCSSCache(){try{await caches.delete(CSS_CACHE_NAME);console.log('[CSS-SW] CSS-Cache wurde geleert');}catch(error){console.error('[CSS-SW] Fehler beim Leeren des CSS-Cache:',error);}}
async function prefetchSpecificCSS(urls){try{const cache=await caches.open(CSS_CACHE_NAME);for(const url of urls){try{const response=await fetch(url);if(response&&response.ok){await cache.put(url,response);console.log('[CSS-SW] Spezifisches Prefetch für:',url);}}catch(error){console.log('[CSS-SW] Spezifisches Prefetch fehlgeschlagen für:',url);}}}catch(error){console.error('[CSS-SW] Fehler beim spezifischen Prefetching:',error);}}
async function getCacheStats(){try{const cache=await caches.open(CSS_CACHE_NAME);const requests=await cache.keys();return{cssEntries:requests.length,maxEntries:CSS_CACHE_CONFIG.maxEntries,cacheUtilization:(requests.length/CSS_CACHE_CONFIG.maxEntries)*100,cachedUrls:requests.map(req=>req.url)};}catch(error){console.error('[CSS-SW] Fehler beim Abrufen der Cache-Stats:',error);return{error:error.message};}}
self.addEventListener('install',()=>{console.log('[CSS-SW] Installation gestartet um:',new Date().toISOString());});self.addEventListener('activate',()=>{console.log('[CSS-SW] Aktivierung abgeschlossen um:',new Date().toISOString());});self.addEventListener('error',event=>{console.error('[CSS-SW] Globaler Fehler:',event.error);});self.addEventListener('unhandledrejection',event=>{console.error('[CSS-SW] Unbehandelte Promise-Rejection:',event.reason);});console.log('[CSS-SW] CSS-Caching Service Worker geladen');