// Live on-chain payout proof: feed section (if #payoutFeed exists) + timed
// toast pop-ups when payments are seen on the RM Circle contract.
(function(){
  const SCAN='https://polygonscan.com/tx/';
  const TOAST_FRESH_S=15*60;      // toast anything seen on-chain in the last 15 min
  const TOAST_SHOW_MS=8000, TOAST_GAP_MS=2500, TOAST_MAX_QUEUE=5;
  let seen;
  try{seen=new Set(JSON.parse(sessionStorage.getItem('ctb.seenPayouts')||'[]'))}catch(e){seen=new Set()}
  function remember(k){seen.add(k);try{sessionStorage.setItem('ctb.seenPayouts',JSON.stringify([...seen].slice(-300)))}catch(e){}}
  function esc(s){return String(s??'').replace(/[&<>'"]/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;',"'":'&#39;','"':'&quot;'}[c]))}
  function fmtPol(n){return n>=100?n.toFixed(1):n.toFixed(2)}
  function timeAgo(ts){
    if(!ts)return '';
    const s=Math.max(0,Math.floor(Date.now()/1000-ts));
    if(s<60)return 'just now';
    if(s<3600)return Math.floor(s/60)+' min ago';
    if(s<86400)return Math.floor(s/3600)+'h ago';
    return Math.floor(s/86400)+'d ago';
  }

  function verifyHref(p){return p.tx?SCAN+p.tx:'https://polygonscan.com/address/'+(p.toAccount||'0x33BdAEEfd6d17D80aE53816c916dFb26c4fB2DAF')}
  let stack=null;
  function getStack(){
    if(!stack){stack=document.createElement('div');stack.className='pp-stack';document.body.appendChild(stack)}
    return stack;
  }
  const queue=[];let showing=false;
  function enqueue(p){if(queue.length>=TOAST_MAX_QUEUE)return;queue.push(p);if(!showing)showNext()}
  function showNext(){
    const p=queue.shift();
    if(!p){showing=false;return}
    showing=true;
    const el=document.createElement('a');
    el.className='pp-toast';el.href=verifyHref(p);el.target='_blank';el.rel='noopener noreferrer';
    const head=p.kind==='upline'&&p.upgrade
      ?`🚀 Member #${p.upgrade.id} upgraded to ${esc(p.upgrade.levelName)}`
      :`💸 Member #${p.toId} just got paid`;
    const sub=p.kind==='upline'
      ?`${fmtPol(p.pol)} POL paid up to Member #${p.toId}`
      :(p.kind==='referral'?`+${fmtPol(p.pol)} POL · direct referral reward`:`+${fmtPol(p.pol)} POL · ${p.desc||p.levelName||'payout'}`);
    el.innerHTML=`<span class="pp-toast-head">${head}</span><span class="pp-toast-sub">${esc(sub)}</span><span class="pp-toast-verify">${timeAgo(p.ts)} · Verify on Polygonscan ↗</span>`;
    getStack().appendChild(el);
    requestAnimationFrame(()=>el.classList.add('show'));
    setTimeout(()=>{el.classList.remove('show');setTimeout(()=>{el.remove();setTimeout(showNext,TOAST_GAP_MS)},450)},TOAST_SHOW_MS);
  }

  function rowHtml(p){
    const when=timeAgo(p.ts);
    const verify=`<a class="pp-verify" href="${esc(verifyHref(p))}" target="_blank" rel="noopener noreferrer">Verify ↗</a>`;
    if(p.kind==='upline'){
      const up=p.upgrade?`Member #${p.upgrade.id} upgraded to ${esc(p.upgrade.levelName)} — `:'';
      const passed=p.passed&&p.passed.length?`<div class="pp-passed">passed over ${p.passed.map(i=>'#'+i).join(', ')} (not yet eligible — needs 2 directs and the level)</div>`:'';
      return `<div class="pp-row"><div class="pp-icon">🚀</div><div class="pp-body"><strong>${up}${fmtPol(p.pol)} POL paid up to Member #${p.toId}</strong><div class="pp-meta">Upgrade pass-up · ${esc(p.levelName)} · ${when}</div>${passed}</div>${verify}</div>`;
    }
    const meta=p.kind==='referral'?`Direct referral reward from #${p.fromId}'s entry`:`${esc(p.desc||p.levelName)} — from #${p.fromId}`;
    return `<div class="pp-row"><div class="pp-icon">💸</div><div class="pp-body"><strong>Member #${p.toId} received ${fmtPol(p.pol)} POL</strong><div class="pp-meta">${meta} · ${when}</div></div>${verify}</div>`;
  }
  // Paginated feed: keep a deduped store of payouts (by key), most-recent first.
  // The live poll refreshes the top (recent) page; "Show more" pulls older pages.
  const PAGE=12;
  const store=new Map();       // key -> payout
  let total=0, visible=PAGE, fetching=false;
  const allSorted=()=>[...store.values()].sort((a,b)=>(b.ts||0)-(a.ts||0));

  function ingest(d){
    if(d&&Array.isArray(d.payouts))for(const p of d.payouts)store.set(p.key,p);
    if(d&&typeof d.total==='number')total=Math.max(total,d.total);
  }
  function updateTotals(d){
    const totals=document.getElementById('payoutTotals');
    if(totals&&d&&d.totals)totals.innerHTML=`<div class="fact"><small>Members on-chain</small><strong>${d.totals.members}</strong></div><div class="fact"><small>Payouts recorded</small><strong>${d.totals.payouts}</strong></div><div class="fact"><small>POL paid to members</small><strong>${Math.round(d.totals.pol).toLocaleString()}</strong></div>`;
  }

  function ensureMoreBtn(){
    let btn=document.getElementById('ppMore');
    if(!btn){
      const feed=document.getElementById('payoutFeed');
      if(!feed)return null;
      btn=document.createElement('button');
      btn.id='ppMore';btn.type='button';btn.className='btn btn-secondary pp-more';
      btn.addEventListener('click',onMoreClick);
      feed.parentNode.insertBefore(btn,feed.nextSibling);
    }
    return btn;
  }
  function renderMoreBtn(loadedLen){
    const btn=ensureMoreBtn();if(!btn)return;
    const cap=Math.max(total,loadedLen);
    if(cap<=PAGE){btn.style.display='none';return}
    btn.style.display='';
    const showingNow=Math.min(visible,cap);
    if(showingNow<cap){btn.dataset.mode='more';btn.textContent=`Show more · showing ${showingNow} of ${cap}`;}
    else{btn.dataset.mode='less';btn.textContent='Show fewer';}
  }
  function renderFeed(){
    const feed=document.getElementById('payoutFeed');
    if(!feed)return;
    const all=allSorted();
    if(!all.length){feed.innerHTML='<div class="empty">Reading the blockchain… check back in a minute.</div>';return}
    feed.innerHTML=all.slice(0,visible).map(rowHtml).join('');
    renderMoreBtn(all.length);
  }

  async function fetchPage(offset,limit){
    if(fetching)return null;
    fetching=true;
    try{const r=await fetch(`/api/public/payouts?offset=${offset}&limit=${limit}`);const d=await r.json();ingest(d);updateTotals(d);return d}
    catch(e){return null}
    finally{fetching=false}
  }
  async function onMoreClick(){
    const btn=document.getElementById('ppMore');
    if(btn&&btn.dataset.mode==='less'){
      visible=PAGE;renderFeed();
      const sec=document.getElementById('proof');if(sec)sec.scrollIntoView({behavior:'smooth',block:'start'});
      return;
    }
    visible+=PAGE;
    if(visible>store.size&&store.size<total){await fetchPage(Math.max(0,store.size-4),PAGE+8);}
    renderFeed();
  }

  async function poll(){
    const d=await fetchPage(0,40);   // recent page drives the live feed + toasts
    if(!d||!d.payouts)return;
    renderFeed();
    const now=Date.now()/1000;
    const fresh=d.payouts.filter(p=>p.ts&&(now-p.ts)<TOAST_FRESH_S&&!seen.has(p.key));
    fresh.slice(0,TOAST_MAX_QUEUE).reverse().forEach(p=>{remember(p.key);enqueue(p)});
  }
  poll();
  setInterval(poll,45000);
})();