/* Always-on muted idle loop; foreground broadcast temporarily owns the scene. */
(function(){
'use strict';
const stage=document.querySelector('#stage'),scene=document.querySelector('#idle-scene');
const video=document.querySelector('#idle-video'),poster=document.querySelector('#idle-poster');
const fullscreen=document.querySelector('#idle-fullscreen');
if(!stage||!scene||!video||!poster||!fullscreen||document.documentElement.classList.contains('content-reader'))return;
let failed=false,blocked=false,pending=false,pageActive=true,hasFrame=false,retries=0,retryTimer=0;
video.muted=true;video.defaultMuted=true;video.loop=true;video.autoplay=true;
video.setAttribute('aria-label','知微自动循环待机视频');
const broadcasting=()=>stage.classList.contains('broadcast-scene-visible');
const shouldPlay=()=>pageActive&&!document.hidden&&!broadcasting()&&!failed&&!blocked;
const activate=()=>stage.classList.add('has-idle-scene');
const inFullscreen=()=>document.fullscreenElement===video||video.webkitDisplayingFullscreen;
function controls(){fullscreen.hidden=broadcasting();fullscreen.disabled=failed;}
function source(){if(!video.getAttribute('src'))video.src=video.dataset.src;}
function sync(){
 if(!shouldPlay()){if(!video.paused)video.pause();controls();return;}
 if(!pending&&(video.paused||video.ended)){
  source();pending=true;
  Promise.resolve(video.play()).then(()=>{if(!shouldPlay())video.pause();})
   .catch(error=>{if(shouldPlay()&&error.name!=='AbortError'){blocked=true;scene.classList.remove('is-video-visible');}})
   .finally(()=>{pending=false;controls();});
 }
 controls();
}
function recover(){
 if(document.hidden||!pageActive)return;
 blocked=false;
 if(failed){failed=false;source();video.load();}
 sync();
}
function retry(){
 if(retryTimer||retries>=2)return;
 retryTimer=setTimeout(()=>{retryTimer=0;retries++;recover();},retries?4000:1500);
}
poster.addEventListener('load',activate);
poster.addEventListener('error',()=>{if(!hasFrame)stage.classList.remove('has-idle-scene');});
if(poster.complete&&poster.naturalWidth)activate();
video.addEventListener('playing',()=>{
 if(!shouldPlay()){video.pause();return;}
 hasFrame=true;activate();scene.classList.add('is-video-visible');controls();
});
video.addEventListener('pause',()=>{controls();if(shouldPlay()&&!inFullscreen())queueMicrotask(sync);});
video.addEventListener('error',()=>{
 failed=true;hasFrame=false;scene.classList.remove('is-video-visible');video.pause();
 if(!poster.naturalWidth)stage.classList.remove('has-idle-scene');
 controls();retry();
});
function gesture(){if(blocked||failed)recover();}
document.addEventListener('pointerdown',gesture,{passive:true});
document.addEventListener('keydown',gesture);
fullscreen.addEventListener('click',()=>{
 recover();source();sync();
 try{Promise.resolve(video.requestFullscreen?video.requestFullscreen():video.webkitEnterFullscreen?.())
  .catch(()=>{fullscreen.title='当前浏览器暂不支持全屏播放';});}
 catch{fullscreen.title='当前浏览器暂不支持全屏播放';}
});
function fullscreenControls(){
 const active=inFullscreen();video.controls=!!active;scene.setAttribute('aria-hidden',String(!active));if(!active)sync();
}
video.addEventListener('fullscreenchange',fullscreenControls);
video.addEventListener('webkitbeginfullscreen',()=>{video.controls=true;scene.setAttribute('aria-hidden','false');});
video.addEventListener('webkitendfullscreen',()=>{video.controls=false;scene.setAttribute('aria-hidden','true');sync();});
new MutationObserver(sync).observe(stage,{attributes:true,attributeFilter:['class']});
document.addEventListener('visibilitychange',()=>{if(!document.hidden)recover();else sync();});
window.addEventListener('pagehide',()=>{pageActive=false;video.pause();clearTimeout(retryTimer);retryTimer=0;});
window.addEventListener('pageshow',()=>{pageActive=true;recover();});
window.addEventListener('online',()=>{retries=0;recover();});
window.IdleBackground={resetAnchor(){if(video.readyState>=1){try{video.currentTime=0;}catch{}}}};
sync();
})();