(function () {
  'use strict';

  function basePath() {
    return document.body.getAttribute('data-base-path') || '';
  }

  function el(id) {
    return document.getElementById(id);
  }

  function escapeHtml(s) {
    return String(s || '')
      .replace(/&/g, '&')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;');
  }

  function detectPlatform() {
    var ua = navigator.userAgent || '';
    if (/Android/i.test(ua)) return 'android';
    if (/iPhone|iPad|iPod/i.test(ua)) return 'ios';
    if (/Firefox\//i.test(ua)) return 'firefox';
    if (/Edg\//i.test(ua)) return 'edge';
    if (/Chrome\//i.test(ua)) return 'chrome';
    if (/Safari\//i.test(ua)) return 'safari';
    return 'desktop';
  }

  function anonId() {
    var key = 'ac_live_anon_id';
    try {
      var existing = localStorage.getItem(key);
      if (existing) return existing;
      var id = 'anon-' + Math.random().toString(36).slice(2) + Date.now().toString(36);
      localStorage.setItem(key, id);
      return id;
    } catch (e) {
      return 'anon-' + Date.now();
    }
  }

  function apiUrl() {
    return basePath() + '/api/live_cast.php';
  }

  function postJoinEvent(sessionId, eventType, direct) {
    var xhr = new XMLHttpRequest();
    xhr.open('POST', apiUrl(), true);
    xhr.setRequestHeader('Content-Type', 'application/json; charset=utf-8');
    xhr.send(JSON.stringify({
      action: 'join_event',
      session_id: sessionId,
      event_type: eventType,
      platform: detectPlatform(),
      channel: direct ? 'direct_link' : 'viewer_link',
      direct: !!direct,
      anon_id: anonId()
    }));
  }

  function fetchSession(sessionId, cb) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', apiUrl() + '?action=session&session_id=' + encodeURIComponent(sessionId), true);
    xhr.onload = function () {
      var payload = null;
      try {
        payload = JSON.parse(xhr.responseText);
      } catch (e) {
        cb(null);
        return;
      }
      cb(payload && payload.ok ? payload.session : null);
    };
    xhr.onerror = function () { cb(null); };
    xhr.send();
  }

  function formatStatus(session) {
    if (!session) return 'Unknown';
    var st = session.status || '';
    if (st === 'live' || st === 'intent') return 'Live';
    if (st === 'closed') return 'Ended';
    if (st === 'expired') return 'Expired';
    return st;
  }

  function renderStats(statsEl, stats) {
    if (!statsEl || !stats) return;
    statsEl.hidden = false;
    statsEl.innerHTML =
      '<strong>Statistics for nerds</strong><br>'
      + 'ICE: ' + escapeHtml(stats.ice_state || '—')
      + ' · sig: ' + escapeHtml(stats.signaling_state || '—')
      + '<br>In: ' + (stats.inbound_kbps || 0) + ' kbps · Out: ' + (stats.outbound_kbps || 0) + ' kbps'
      + '<br>RTT: ' + (stats.rtt_ms || 0) + ' ms · frames: ' + (stats.frames_decoded || 0)
      + (stats.frame_w ? '<br>Frame: ' + stats.frame_w + '×' + stats.frame_h : '');
  }

  function startViewer(sessionId, session, playerEl, statusEl, statsEl) {
    if (!window.RTCPeerConnection || !window.LiveCastWebRtc) {
      playerEl.innerHTML = '<p class="muted">WebRTC is not available in this browser.</p>';
      return null;
    }
    playerEl.innerHTML =
      '<video id="live-remote-video" class="live-preview" playsinline autoplay controls></video>'
      + '<div id="live-join-stats" class="live-stats-nerds" hidden></div>';
    var video = el('live-remote-video');
    var nerds = el('live-join-stats');
    var conn = window.LiveCastWebRtc.connect({
      basePath: basePath(),
      sessionId: sessionId,
      role: 'viewer',
      onStatus: function (msg) {
        statusEl.textContent = formatStatus(session) + ' — ' + msg;
      },
      onRemoteStream: function (stream) {
        if (video) {
          video.srcObject = stream;
          video.play().catch(function () {});
        }
        statusEl.textContent = formatStatus(session) + ' — playing stream';
      },
      onStats: function (stats) {
        renderStats(nerds || statsEl, stats);
      }
    });
    if (conn && video) conn.setRemoteVideo(video);
    return conn;
  }

  function boot() {
    var root = el('live-join-app');
    if (!root) return;

    var params = new URLSearchParams(window.location.search);
    var sessionId = params.get('session_id') || root.getAttribute('data-session-id') || '';
    var direct = params.get('direct') === '1' || root.getAttribute('data-direct') === '1';
    var role = params.get('role') || (direct ? 'direct' : 'viewer');
    var webrtcConn = null;

    if (!sessionId) {
      el('live-join-status').textContent = 'Missing session_id in URL.';
      return;
    }

    postJoinEvent(sessionId, 'open', direct);

    var statusEl = el('live-join-status');
    var metaEl = el('live-join-meta');
    var playerEl = el('live-join-player');
    var statsEl = el('live-join-stats-panel');

    function render(session) {
      if (!session) {
        statusEl.textContent = 'Session not found or no longer available.';
        return;
      }
      var live = session.status === 'live' || session.status === 'intent';
      statusEl.textContent = formatStatus(session) + (live ? ' — connecting…' : '');
      var owner = session.owner_username || 'host';
      var lines = [
        'Host: ' + owner,
        'Platform: ' + (session.platform || '—'),
        'Video: ' + (session.codec_video || '—'),
        'Audio: ' + (session.codec_audio || '—'),
        'Bandwidth: ' + (session.bw_mode || '—')
      ];
      if (session.join_short_url) {
        lines.push('Viewer link: ' + session.join_short_url);
      }
      metaEl.innerHTML = lines.map(function (l) {
        return '<li>' + escapeHtml(l) + '</li>';
      }).join('');

      if (direct && /android|ios/i.test(detectPlatform())) {
        playerEl.innerHTML =
          '<p class="muted">Open in the AndroidCast app for direct P2P on LAN.</p>' +
          '<p><code>androidcast://join?session_id=' + escapeHtml(sessionId) + '&amp;direct=1</code></p>' +
          '<p class="muted">Mobile WebRTC signaling uses the same REST API when the app transport is wired.</p>';
        postJoinEvent(sessionId, 'join', true);
      } else if (live) {
        webrtcConn = startViewer(sessionId, session, playerEl, statusEl, statsEl);
        postJoinEvent(sessionId, 'join', false);
      } else {
        playerEl.innerHTML = '<p class="muted">Session is not live.</p>';
      }

      if (window.AndroidCastAnalytics && window.AndroidCastAnalytics.trackEvent) {
        window.AndroidCastAnalytics.trackEvent('live_join_view', {
          session_id: sessionId,
          direct: direct ? 1 : 0,
          platform: detectPlatform(),
          status: session.status || ''
        });
      }
    }

    fetchSession(sessionId, render);
    setInterval(function () {
      fetchSession(sessionId, function (session) {
        if (!session) return;
        if (!(session.status === 'live' || session.status === 'intent')) {
          statusEl.textContent = formatStatus(session);
          if (webrtcConn) {
            webrtcConn.stop();
            webrtcConn = null;
          }
        }
      });
    }, 30000);

    window.addEventListener('beforeunload', function () {
      if (webrtcConn) webrtcConn.stop();
    });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', boot);
  } else {
    boot();
  }
})();