/* Lazy classic chunk; its executing singleton stays pinned until reload. */
(window.YT ||= {}).Party = (() => {
  const noop = { boot() {}, guestActive: () => false, intercept: () => false, afterLoad() {} };
  if (!WEB || typeof WebSocket === 'undefined') return noop;
  const PID_KEY = 'ytpPartyPid', HOST_KEY = 'ytpPartyHost', NAME_KEY = 'ytpPartyName';
  const ls = {
    get: (k) => { try { return localStorage.getItem(k); } catch { return null; } },
    set: (k, v) => { try { if (v == null) localStorage.removeItem(k); else localStorage.setItem(k, v); } catch { /* blocked */ } },
  };
  let pid = ls.get(PID_KEY);
  if (!pid) { pid = 'p' + Math.random().toString(36).slice(2, 12) + Date.now().toString(36); ls.set(PID_KEY, pid); }
  const wsUrl = (q) => `${location.protocol === 'https:' ? 'wss' : 'ws'}://${location.host}/ws/party?${new URLSearchParams(q)}`;

  const st = {
    ws: null, role: null, code: '', secret: '', name: '', members: [], chat: [], state: null, offset: 0,
    dj: { enabled: false, entries: [] }, djPending: false,
    allowControl: false, quietUntil: 0, detached: false, retry: null, pushTimer: null, driftTimer: null, lastPush: '',
    voice: { on: false, stream: null, muted: false, pcs: new Map(), audios: new Map() },
    minimized: false,
  };
  const inParty = () => !!st.role;
  const isHost = () => st.role === 'host';
  const guestActive = () => st.role === 'guest' && !st.detached;
  const send = (m) => { if (st.ws && st.ws.readyState === 1) st.ws.send(JSON.stringify(m)); };
  const serverNow = () => Date.now() + st.offset;
  const myName = () => st.name || (data.profile && data.profile.name) || ls.get(NAME_KEY) || '';

  // ---------- connection ----------
  function connect() {
    clearTimeout(st.retry);
    const q = { role: st.role, pid, name: myName() || 'Guest' };
    if (st.code) q.code = st.code;
    if (isHost() && st.secret) q.secret = st.secret;
    const ws = new WebSocket(wsUrl(q));
    st.ws = ws;
    ws.onmessage = (e) => { let m; try { m = JSON.parse(e.data); } catch { return; } onMessage(m); };
    ws.onclose = (e) => {
      if (st.ws !== ws) return;
      st.ws = null;
      if (!inParty()) return;
      if (e.code === 4010 || e.code === 4004 || e.code === 4003) {
        const why = e.code === 4004 ? 'That party code doesn’t exist (or has ended).' : e.code === 4003 ? 'This party belongs to another host.' : 'The party ended.';
        leave(false);
        toast(`🎉 ${why}`, { duration: 5000 });
        return;
      }
      setStatus('Reconnecting…');
      st.retry = setTimeout(connect, 3000);
    };
    ws.onerror = () => { if (!st.code && isHost()) setStatus('Could not reach the server'); };
  }

  function onMessage(m) {
    DirectMedia.attach('party', { send, peers: () => st.members.filter(m => m.pid !== pid).map(m => ({ id: m.pid, name: m.name, files: m.host && st.state?.directAvailable && st.state?.v ? [st.state.v.id] : [] })) });
    if (m.type === 'direct') { DirectMedia.handle('party', m); return; }
    if (m.type === 'hello') {
      st.code = m.code;
      if (m.secret) { st.secret = m.secret; ls.set(HOST_KEY, JSON.stringify({ code: m.code, secret: m.secret })); }
      st.offset = (m.now || Date.now()) - Date.now();
      st.members = m.members || [];
      st.chat = m.chat || [];
      st.dj = m.dj || { enabled: false, entries: [] }; st.djPending = false;
      st.allowControl = !!m.allowControl;
      setStatus(isHost() ? 'You’re hosting' : 'Synced with the host');
      render();
      if (isHost()) pushState(true);
      else if (m.state) applyState(m.state);
      if (st.voice.on) { send({ type: 'voice', on: true }); connectVoicePeers(); }
    } else if (m.type === 'dj') {
      st.dj = { enabled: m.enabled, entries: m.entries || [] }; render();
    } else if (m.type === 'dj-play' && isHost()) {
      st.djPending = false; if (m.video) { Player._handoff = null; playVideoAt(m.video); } else { st.dj.entries = st.dj.entries.filter(e => !e.approved); advanceQueue(); }
    } else if (m.type === 'state') {
      st.state = m.state;
      if (st.role === 'guest') applyState(m.state);
    } else if (m.type === 'members') {
      st.members = m.members || [];
      if (m.joined) sysMsg(`${m.joined} joined`);
      if (m.left) sysMsg(`${m.left} left${m.hostAway ? ' — waiting for the host to come back' : ''}`);
      render();
      syncVoicePeers();
    } else if (m.type === 'chat') {
      st.chat.push(m.msg);
      if (st.chat.length > 100) st.chat.shift();
      renderChat();
      if (m.msg.pid !== pid && (st.minimized || $('partyPanel').classList.contains('hidden'))) toast(`💬 ${m.msg.from}: ${m.msg.text}`);
    } else if (m.type === 'settings') {
      st.allowControl = !!m.allowControl;
      render();
      if (!isHost()) sysMsg(st.allowControl ? 'The host lets everyone control playback' : 'Only the host controls playback now');
    } else if (m.type === 'cmd' && isHost()) {
      runCommand(m);
    } else if (m.type === 'rtc') {
      onRtc(m.from, m.data);
    } else if (m.type === 'ended') {
      toast(`🎉 ${m.reason || 'The party ended'}`, { duration: 5000 });
    }
  }

  // ---------- host: broadcast ----------
  function stateNow() {
    const meta = current && current.meta;
    const M = Player.master;
    return {
      directAvailable: !!meta && cachedIds.has(meta.id) && DirectMedia.enabled() && data.settings.p2pShare !== false,
      v: meta ? { id: meta.id, title: meta.title || '', channel: meta.channel || '', thumbnail: meta.thumbnail || '', duration: meta.duration || 0 } : null,
      cur: M ? M.currentTime || 0 : 0,
      paused: !M || M.paused,
      rate: (M && M.playbackRate) || 1,
    };
  }
  function pushState(force = false) {
    if (!isHost() || !st.ws) return;
    const s = stateNow();
    const key = JSON.stringify({ ...s, cur: Math.round(s.cur) });
    if (!force && key === st.lastPush) return;
    st.lastPush = key;
    send({ type: 'state', state: s });
  }
  function runCommand(m) {
    switch (m.cmd) {
      case 'toggle': Player.toggle(); break;
      case 'play': Player.play(); break;
      case 'pause': Player.pause(); break;
      case 'seek': if (Number.isFinite(Number(m.t))) Player.seek(Math.max(0, Number(m.t))); break;
      case 'next': playNext(); break;
      case 'prev': playPrev(); break;
      default: return;
    }
    toast(`🎉 ${m.from}: ${m.cmd === 'seek' ? `jumped to ${fmtTime(Number(m.t))}` : m.cmd}`);
    setTimeout(() => pushState(true), 200);
  }

  // ---------- guest: follow ----------
  const quiet = (ms = 1500) => { st.quietUntil = Date.now() + ms; };
  function targetTime(s) {
    if (!s) return 0;
    return s.paused ? s.cur : s.cur + ((serverNow() - (s.ts || serverNow())) / 1000) * (s.rate || 1);
  }
  async function applyState(s) {
    st.state = s;
    if (st.role !== 'guest' || st.detached || !s || !s.v) { render(); return; }
    const target = targetTime(s);
    if (!current || !current.meta || current.meta.id !== s.v.id) {
      quiet(6000);
      await playVideoAt({ ...s.v }, target);
      return;
    }
    const M = Player.master;
    if (!M) return;
    if ((M.playbackRate || 1) !== (s.rate || 1)) { els.speed.value = String(s.rate || 1); Player.applySpeed(); }
    if (Math.abs((M.currentTime || 0) - target) > 1.5) { quiet(); Player.seek(target); }
    if (s.paused && !M.paused) { quiet(); Player.pause(); updatePlayBtn(); }
    else if (!s.paused && M.paused) { quiet(); Player.play(); updatePlayBtn(); }
  }
  // A guest's own actions: forwarded when allowed, else they go off sync.
  function onLocalAction(kind) {
    if (st.role !== 'guest' || st.detached || Date.now() < st.quietUntil) return;
    if (st.allowControl) {
      const M = Player.master;
      if (kind === 'seeked') send({ type: 'cmd', cmd: 'seek', t: M.currentTime });
      else send({ type: 'cmd', cmd: kind === 'pause' ? 'pause' : 'play' });
      return;
    }
    st.detached = true;
    setStatus('Off sync — you paused or skipped on your own');
    render();
  }
  // playNext/playPrev guard: guests don't change songs themselves.
  function intercept(cmd) {
    if (st.role !== 'guest' || st.detached) return false;
    if (st.allowControl) send({ type: 'cmd', cmd });
    else toast('🎉 The host picks the songs in a watch party');
    return true;
  }
  function resync() {
    st.detached = false;
    setStatus('Synced with the host');
    render();
    applyState(st.state);
  }

  // ---------- voice (WebRTC mesh) ----------
  const ICE = [{ urls: 'stun:stun.l.google.com:19302' }, { urls: 'stun:stun1.l.google.com:19302' }];
  function peer(other) {
    let pc = st.voice.pcs.get(other);
    if (pc) return pc;
    pc = new RTCPeerConnection({ iceServers: ICE });
    st.voice.pcs.set(other, pc);
    if (st.voice.stream) st.voice.stream.getTracks().forEach((t) => pc.addTrack(t, st.voice.stream));
    pc.onicecandidate = (e) => { if (e.candidate) send({ type: 'rtc', to: other, data: { ice: e.candidate } }); };
    pc.ontrack = (e) => {
      let a = st.voice.audios.get(other);
      if (!a) { a = new Audio(); a.autoplay = true; a.setAttribute('playsinline', ''); st.voice.audios.set(other, a); }
      a.srcObject = e.streams[0];
      a.play().catch(() => {});
    };
    pc.onconnectionstatechange = () => { if (['failed', 'closed'].includes(pc.connectionState)) dropPeer(other); render(); };
    return pc;
  }
  function dropPeer(other) {
    const pc = st.voice.pcs.get(other);
    if (pc) { try { pc.close(); } catch { /* closed */ } st.voice.pcs.delete(other); }
    const a = st.voice.audios.get(other);
    if (a) { a.srcObject = null; st.voice.audios.delete(other); }
  }
  async function offerTo(other) {
    const pc = peer(other);
    const offer = await pc.createOffer();
    await pc.setLocalDescription(offer);
    send({ type: 'rtc', to: other, data: { sdp: pc.localDescription } });
  }
  async function onRtc(from, d) {
    if (!st.voice.on || !d) return;
    try {
      if (d.sdp) {
        const pc = peer(from);
        await pc.setRemoteDescription(d.sdp);
        if (d.sdp.type === 'offer') {
          const ans = await pc.createAnswer();
          await pc.setLocalDescription(ans);
          send({ type: 'rtc', to: from, data: { sdp: pc.localDescription } });
        }
      } else if (d.ice) {
        await peer(from).addIceCandidate(d.ice);
      }
    } catch { /* a glare/ICE hiccup — the next members update retries */ }
  }
  // The member with the smaller pid makes the offer, so each pair connects once.
  function connectVoicePeers() {
    if (!st.voice.on) return;
    for (const m of st.members) if (m.voice && m.pid !== pid && !st.voice.pcs.has(m.pid) && pid < m.pid) offerTo(m.pid).catch(() => {});
  }
  function syncVoicePeers() {
    const voiced = new Set(st.members.filter((m) => m.voice).map((m) => m.pid));
    for (const other of [...st.voice.pcs.keys()]) if (!voiced.has(other)) dropPeer(other);
    connectVoicePeers();
  }
  async function toggleVoice() {
    if (st.voice.on) {
      st.voice.on = false;
      for (const other of [...st.voice.pcs.keys()]) dropPeer(other);
      if (st.voice.stream) st.voice.stream.getTracks().forEach((t) => t.stop());
      st.voice.stream = null;
      send({ type: 'voice', on: false });
      render();
      return;
    }
    if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia || typeof RTCPeerConnection === 'undefined') { toast('Voice chat isn’t supported in this browser'); return; }
    try {
      st.voice.stream = await navigator.mediaDevices.getUserMedia({ audio: { echoCancellation: true, noiseSuppression: true, autoGainControl: true } });
    } catch (e) {
      toast('🎤 Microphone blocked: ' + (e.message || e.name));
      return;
    }
    st.voice.on = true;
    st.voice.muted = false;
    send({ type: 'voice', on: true });
    toast('🎤 Voice on — headphones stop the music echoing into your mic', { duration: 5000 });
    render();
    connectVoicePeers();
  }
  function toggleMute() {
    if (!st.voice.stream) return;
    st.voice.muted = !st.voice.muted;
    st.voice.stream.getAudioTracks().forEach((t) => { t.enabled = !st.voice.muted; });
    render();
  }

  // ---------- lifecycle ----------
  function start() {
    st.role = 'host';
    st.code = ''; st.secret = ''; st.chat = []; st.members = [];
    ls.set(HOST_KEY, null);
    showPanel();
    setStatus('Starting…');
    connect();
    beginTimers();
  }
  function join(code, name) {
    code = String(code || '').toUpperCase().replace(/[^A-Z0-9]/g, '');
    if (code.length !== 6) { toast('Party codes have 6 letters/numbers'); return; }
    if (name) { st.name = name; ls.set(NAME_KEY, name); }
    st.role = 'guest';
    st.code = code; st.detached = false; st.chat = []; st.members = [];
    showPanel();
    setStatus('Joining…');
    connect();
    beginTimers();
  }
  function beginTimers() {
    clearInterval(st.pushTimer); clearInterval(st.driftTimer);
    st.pushTimer = setInterval(() => pushState(), 3000);
    st.driftTimer = setInterval(() => { if (st.role === 'guest' && st.state && !st.detached) applyState(st.state); }, 2500);
  }
  function leave(sendEnd = true) {
    if (isHost() && sendEnd) send({ type: 'end' });
    if (st.voice.on) toggleVoice();
    const ws = st.ws;
    st.ws = null;
    st.role = null; st.code = ''; st.secret = '';
    clearTimeout(st.retry); clearInterval(st.pushTimer); clearInterval(st.driftTimer);
    try { if (ws) ws.close(); } catch { /* gone */ }
    ls.set(HOST_KEY, null);
    $('partyPanel').classList.add('hidden');
    render();
  }

  // ---------- UI ----------
  // Lyrics-instead-of-video is a per-device view: each guest chooses it for
  // themselves, and the host's playback is untouched (the video keeps playing
  // behind the lyrics, so sync and audio carry on).
  const lyricsOn = () => !!(Notes.stageLyrics && Notes.stageLyrics.on());
  function renderLyricsToggle() {
    const b = document.querySelector('#partyPanel .pt-lyrics');
    if (!b) return;
    b.textContent = lyricsOn() ? '📺 Show the video' : '🎤 Lyrics instead of video';
    b.classList.toggle('on', lyricsOn());
  }
  function setStatus(t) { const el = $('ptStatus'); if (el) el.textContent = t; }
  function sysMsg(text) { st.chat.push({ sys: true, text, at: Date.now() }); renderChat(); }
  function link() { return `${location.origin}/?party=${st.code}`; }
  function showPanel() { Lazy.load('feature:party-dj').then(render).catch(error=>toast(error.message)); Lazy.load('feature:direct').catch(error=>toast(error.message)); $('partyPanel').classList.remove('hidden'); st.minimized = false; $('partyPanel').classList.remove('min'); render(); }

  function render() {
    const panel = $('partyPanel');
    const chip = $('navPartyBtn');
    if (chip) {
      const label = chip.querySelector('.nav-label');
      if (label) label.textContent = inParty() ? `Party · ${st.members.length}` : 'Watch party';
      else chip.textContent = inParty() ? `🎉 Party · ${st.members.length}` : '🎉 Watch party';
    }
    if (!panel || panel.classList.contains('hidden')) return;
    const nameOk = !!myName();
    if (!inParty()) {
      panel.querySelector('.pt-body').innerHTML = `
        <p class="modal-text">Watch together: everyone's player follows the host, with chat and optional voice.</p>
        ${nameOk ? '' : '<label class="pt-row">Your name <input class="pt-name" maxlength="40" placeholder="e.g. Rex" /></label>'}
        <button class="rv-primary" type="button" data-act="start">Start a party</button>
        <div class="pt-or">or join one</div>
        <div class="pt-row"><input class="pt-code" maxlength="7" placeholder="CODE" autocapitalize="characters" /><button class="np-btn" type="button" data-act="join">Join</button></div>`;
      $('ptTitle').textContent = '🎉 Watch party';
      setStatus('');
      return;
    }
    $('ptTitle').textContent = `🎉 Party ${st.code || '…'}`;
    const s = st.state && st.state.v;
    panel.querySelector('.pt-body').innerHTML = `
      ${st.code ? `<div class="pt-share"><code>${escapeHtml(link())}</code><button class="np-btn" type="button" data-act="copy">Copy</button>${navigator.share ? '<button class="np-btn" type="button" data-act="share">↗</button>' : ''}</div>` : ''}
      ${!isHost() && s ? `<div class="pt-now">▶ ${escapeHtml(s.title)}</div>` : ''}
      ${!isHost() && st.detached ? '<button class="rv-primary" type="button" data-act="resync">↻ Re-sync with the host</button>' : ''}
      <div class="pt-members">${st.members.map((m) => `<span class="pt-member${m.pid === pid ? ' me' : ''}">${m.host ? '👑 ' : ''}${escapeHtml(m.name)}${m.voice ? ' 🎤' : ''}</span>`).join('')}</div>
      ${isHost() ? `<label class="pt-toggle"><input type="checkbox" data-act="allow" ${st.allowControl ? 'checked' : ''} /> Guests can control playback</label>` : ''}
      <button class="np-btn pt-lyrics${lyricsOn() ? ' on' : ''}" type="button" data-act="lyrics">${lyricsOn() ? '📺 Show the video' : '🎤 Lyrics instead of video'}</button>
      <div class="pt-voice">
        <button class="np-btn${st.voice.on ? ' on' : ''}" type="button" data-act="voice">${st.voice.on ? '🎤 Leave voice' : '🎤 Join voice'}</button>
        ${st.voice.on ? `<button class="np-btn" type="button" data-act="mute">${st.voice.muted ? '🔇 Unmute' : '🔈 Mute'}</button>` : ''}
        <span class="pt-voice-n">${st.voice.on ? `${st.voice.pcs.size} connected` : ''}</span>
      </div>
      <div class="pt-chat" id="ptChat"></div>
      <form class="pt-send"><input class="pt-msg" maxlength="500" placeholder="Message…" autocomplete="off" /><button class="np-btn" type="submit">Send</button></form>
      <button class="pt-leave" type="button" data-act="leave">${isHost() ? 'End the party' : 'Leave the party'}</button>`;
    const dj = document.createElement('div'); panel.querySelector('.pt-body').append(dj);
    if (Lazy.loaded('feature:party-dj')) PartyDJ.render(dj, { state: st.dj, host: isHost(), pid, send, search: async q => { const result = await API.search(q); return result.results || result.videos || []; } });
    renderChat();
  }
  function renderChat() {
    const box = $('ptChat');
    if (!box) return;
    box.innerHTML = st.chat.map((c) => c.sys
      ? `<div class="pt-sys">${escapeHtml(c.text)}</div>`
      : `<div class="pt-line${c.pid === pid ? ' me' : ''}"><b>${escapeHtml(c.from)}</b> ${escapeHtml(c.text)}</div>`).join('');
    box.scrollTop = box.scrollHeight;
  }

  function open() {
    const panel = $('partyPanel');
      if (typeof closeSidebar === 'function') { try { closeSidebar(); } catch { /* not open */ } }
      if (panel.classList.contains('hidden')) showPanel();
      else if (st.minimized) { st.minimized = false; panel.classList.remove('min'); }
      else if (!inParty()) panel.classList.add('hidden');
      else { st.minimized = true; panel.classList.add('min'); }
  }

  function bindUi() {
    const panel = $('partyPanel');
    $('ptMin').addEventListener('click', () => {
      if (!inParty()) { panel.classList.add('hidden'); return; }
      st.minimized = !st.minimized;
      panel.classList.toggle('min', st.minimized);
    });
    panel.addEventListener('keydown', (e) => e.stopPropagation());
    panel.addEventListener('click', async (e) => {
      const a = e.target.closest('[data-act]');
      if (!a || a.tagName === 'INPUT') return;
      const act = a.dataset.act;
      const nameIn = panel.querySelector('.pt-name');
      const name = nameIn ? nameIn.value.trim() : '';
      if ((act === 'start' || act === 'join') && !myName() && !name) { toast('Enter your name first'); if (nameIn) nameIn.focus(); return; }
      if (name) { st.name = name; ls.set(NAME_KEY, name); }
      if (act === 'start') start();
      else if (act === 'join') join(panel.querySelector('.pt-code').value);
      else if (act === 'copy') { try { await navigator.clipboard.writeText(link()); toast('Party link copied ✓'); } catch { toast('Copy blocked'); } }
      else if (act === 'share') { try { await navigator.share({ title: 'Join my watch party', url: link() }); } catch { /* dismissed */ } }
      else if (act === 'resync') resync();
      else if (act === 'voice') toggleVoice();
      else if (act === 'mute') toggleMute();
      else if (act === 'lyrics') { Notes.stageLyrics.set(!lyricsOn()); renderLyricsToggle(); }
      else if (act === 'leave') leave(true);
    });
    panel.addEventListener('change', (e) => {
      if (e.target.dataset.act === 'allow') { st.allowControl = e.target.checked; send({ type: 'settings', allowControl: st.allowControl }); }
    });
    panel.addEventListener('submit', (e) => {
      e.preventDefault();
      const input = panel.querySelector('.pt-msg');
      const text = input.value.trim();
      if (text) { send({ type: 'chat', text }); input.value = ''; }
    });
    // Host: push on every player change; guests: detect their own actions.
    ['play', 'pause', 'seeked', 'ratechange', 'loadedmetadata'].forEach((ev) => {
      [els.video, els.audio].forEach((el) => el.addEventListener(ev, (e) => {
        if (el !== Player.master) return;
        if (isHost()) pushState(true);
        else if (ev === 'play' || ev === 'pause' || ev === 'seeked') onLocalAction(ev);
      }));
    });
  }

  function boot() {
    bindUi();
    render();
    // Resume hosting after a reload.
    try {
      const h = JSON.parse(ls.get(HOST_KEY) || 'null');
      if (h && h.code && h.secret) { st.role = 'host'; st.code = h.code; st.secret = h.secret; showPanel(); connect(); beginTimers(); }
    } catch { /* none */ }
    let code = '';
    try { code = (new URLSearchParams(location.search).get('party') || '').toUpperCase(); } catch { /* no URL */ }
    if (code) {
      try { const u = new URL(location.href); u.searchParams.delete('party'); history.replaceState(null, '', u.pathname + u.search + u.hash); } catch { /* keep */ }
      if (myName()) join(code);
      else { showPanel(); const c = $('partyPanel').querySelector('.pt-code'); if (c) c.value = code; toast('Enter your name, then tap Join'); }
    }
  }

  return {
    nextDJ: () => { if (!isHost() || !st.dj.enabled || !st.dj.entries.some(e => e.approved)) return false; if (!st.djPending) { st.djPending = true; send({ type: 'dj', action: 'take' }); } return true; },
    open, boot, guestActive, intercept, renderLyricsToggle, afterLoad: () => pushState(true),
    state: () => ({
      role: st.role, code: st.code, detached: st.detached, members: st.members.length, voice: st.voice.on,
      peers: st.voice.pcs.size, peerStates: [...st.voice.pcs.values()].map((pc) => pc.connectionState),
      remoteAudio: [...st.voice.audios.values()].filter((a) => a.srcObject && a.srcObject.getAudioTracks().some((t) => t.readyState === 'live')).length,
      chat: st.chat.length, allowControl: st.allowControl,
    }),
    _join: join, _start: start,
  };
})();