self.addEventListener('install', () => self.skipWaiting());
self.addEventListener('activate', event => event.waitUntil(self.clients.claim()));
self.addEventListener('push', event => {
  let message={};
  try {message=event.data?.json() || {};} catch { /* Show a generic notification for malformed payloads. */ }
  let url='/';
  try {const target=new URL(message.url || '/',self.location.origin);if(target.origin===self.location.origin)url=target.pathname+target.search;} catch {}
  event.waitUntil(self.registration.showNotification(message.title || 'A new story on TrueNews',{
    body:message.body || 'Read the latest story.',
    icon:'/assets/icon-192.png',badge:'/assets/icon-192.png',
    tag:message.tag || 'truenews-story',data:{url}
  }));
});
self.addEventListener('notificationclick', event => {
  event.notification.close();
  event.waitUntil((async()=>{
    const target=new URL(event.notification.data?.url || '/',self.location.origin);
    if(target.origin!==self.location.origin) return;
    const windows=await self.clients.matchAll({type:'window',includeUncontrolled:true});
    const existing=windows.find(client=>new URL(client.url).origin===target.origin);
    if(existing){await existing.navigate(target.href);await existing.focus();}
    else await self.clients.openWindow(target.href);
  })());
});