(function(){
  function getSource(){
    try{
      let s=sessionStorage.getItem('ctb.src');
      if(s)return s;
      const p=new URLSearchParams(location.search);
      s=p.get('utm_source')||p.get('src')||'';
      if(!s){const v=p.get('v');if(v&&/^[a-z]{2,12}$/.test(v))s='angle:'+v;}
      if(!s&&document.referrer){try{const h=new URL(document.referrer).hostname;if(h&&h!==location.hostname)s=h}catch(e){}}
      s=s||'(direct)';
      sessionStorage.setItem('ctb.src',s);
      return s;
    }catch(e){return '(direct)'}
  }
  window.ctbGetSource=getSource;
  try{
    const p2=new URLSearchParams(location.search);
    const cid=p2.get('clickid')||p2.get('cid');
    if(cid&&!sessionStorage.getItem('ctb.clickid'))sessionStorage.setItem('ctb.clickid',cid.slice(0,80));
  }catch(e){}
  window.ctbGetClickId=function(){try{return sessionStorage.getItem('ctb.clickid')||''}catch(e){return ''}};
  const path=location.pathname.replace(/\/$/,'')||'/';
  const page=path==='/'?'bridge':(path==='/start'?'start':(path==='/training'?'training':(path==='/join-now'?'joinnow':(/^\/join\/\d+$/.test(path)?'join':null))));
  if(page)fetch('/api/public/track',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({event:page,source:getSource()})}).catch(()=>{});

  // CTB Rewards featured offer: a ctb1_ clickid means this visitor earns
  // coins for a REAL look at the tour — count 30 seconds of visible time on
  // a join page, then report "engaged" once (server relays it to CTB).
  (function(){
    const cid=window.ctbGetClickId();
    if(!cid||cid.indexOf('ctb1_')!==0)return;
    if(page!=='join'&&page!=='joinnow')return;
    try{ if(sessionStorage.getItem('ctb.engaged')===cid)return; }catch(e){}
    let seen=0;
    const t=setInterval(function(){
      if(document.visibilityState!=='visible')return;
      if(++seen<30)return;
      clearInterval(t);
      try{ sessionStorage.setItem('ctb.engaged',cid); }catch(e){}
      fetch('/api/public/track',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({event:'engaged',source:getSource(),clickid:cid})})
        .then(function(){
          const d=document.createElement('div');
          d.style.cssText='position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:9999;background:linear-gradient(135deg,#f3be43,#d89b19);color:#0a1622;font-weight:800;font-size:15px;padding:12px 20px;border-radius:12px;box-shadow:0 8px 28px rgba(0,0,0,.4);max-width:92vw;text-align:center';
          d.textContent='🎉 Visit counted! Your coins land in the CTB Rewards app — check the featured offer card. (Once per day.)';
          document.body.appendChild(d);
          setTimeout(function(){ d.remove(); },8000);
        }).catch(()=>{});
    },1000);
  })();
})();