const V="1"
const send=a=>self.clients.matchAll({type:"window",includeUncontrolled:true}).then(cs=>cs.forEach(c=>c.postMessage(a)))

self.addEventListener('install',e=>{
  self.skipWaiting()
})

self.addEventListener('activate',e=>{
  e.waitUntil((async()=>{await self.clients.claim();await send({type:'SW_ACTIVE',v:V,ts:Date.now()})})())
})

self.addEventListener('fetch',e=>{
  if(e.request.mode==='navigate') send({type:'SW_NAVIGATE',url:e.request.url,ts:Date.now()})
})

self.addEventListener('message',e=>{
  if(e.data&&e.data.type==='PING'){(e.source||null)?.postMessage({type:'PONG',v:V,ts:Date.now()})||send({type:'PONG',v:V,ts:Date.now()})}
  else send({type:'SW_MESSAGE',data:e.data,ts:Date.now()})
})