/**
 * WebSocket client for backone-webhub (127.0.0.1, authtoken auth).
 */
window.BackOneWebHubClient = (function () {
  let ws = null;
  let connected = false;
  let reconnectDelay = 1000;
  let reconnectTimer = null;
  let pollTimer = null;
  let port = 9994;
  let selfPeerId = '';
  const seenIncoming = new Set();
  const handlers = new Map();

  function emit(type, msg) {
    const set = handlers.get(type);
    if (!set) return;
    set.forEach(fn => {
      try { fn(msg); } catch (_) { /* ignore */ }
    });
    const all = handlers.get('*');
    if (all) {
      all.forEach(fn => {
        try { fn(type, msg); } catch (_) { /* ignore */ }
      });
    }
  }

  function subscribe(type, fn) {
    if (!handlers.has(type)) handlers.set(type, new Set());
    handlers.get(type).add(fn);
    return () => handlers.get(type)?.delete(fn);
  }

  function send(msg) {
    if (ws && ws.readyState === WebSocket.OPEN) {
      ws.send(JSON.stringify(msg));
      return true;
    }
    return false;
  }

  function registerPeer() {
    const core = BackOneNetworkSession.getCoreStatus();
    selfPeerId = ((core && core.address) || '').toLowerCase();
    const networkId = BackOneNetworkSession.getNetworkId();
    if (!selfPeerId) return;
    send({ type: 'register', peerId: selfPeerId, networkId });
  }

  function stopHttpPoll() {
    if (pollTimer) {
      clearInterval(pollTimer);
      pollTimer = null;
    }
  }

  function startHttpPoll() {
    stopHttpPoll();
    pollTimer = setInterval(async () => {
      if (connected) return;
      const peerId = selfPeerId || ((BackOneNetworkSession.getCoreStatus().address || '').toLowerCase());
      if (!peerId) return;
      try {
        const res = await BackOneAuth.fetchWithAuth(
          `/controller/comms/call/incoming?peerId=${encodeURIComponent(peerId)}`
        );
        if (!res.ok) return;
        const data = await res.json();
        const calls = Array.isArray(data.calls) ? data.calls : [];
        for (const call of calls) {
          if (seenIncoming.has(call.callId)) continue;
          seenIncoming.add(call.callId);
          emit('incoming_call', {
            type: 'incoming_call',
            callId: call.callId,
            callType: call.callType || 'voice',
            callerId: call.callerId,
            callerName: call.callerName || call.callerId,
            networkId: call.networkId,
            sdp: call.sdp
          });
        }
      } catch (_) { /* ignore */ }
    }, 2000);
  }

  function scheduleReconnect() {
    if (reconnectTimer) return;
    reconnectTimer = setTimeout(() => {
      reconnectTimer = null;
      connect();
    }, reconnectDelay);
    reconnectDelay = Math.min(reconnectDelay * 2, 30000);
  }

  async function loadPort() {
    try {
      const res = await BackOneAuth.fetchWithAuth('/app/api/webrtc-config');
      if (res.ok) {
        const cfg = await res.json();
        if (cfg.webhubPort) port = cfg.webhubPort;
      }
    } catch (_) { /* ignore */ }
  }

  async function connect() {
    await loadPort();
    const token = await BackOneAuth.getToken();
    if (!token) return false;

    if (ws) {
      try { ws.close(); } catch (_) { /* ignore */ }
      ws = null;
    }

    return new Promise((resolve) => {
      const url = `ws://127.0.0.1:${port}/?auth=${encodeURIComponent(token)}`;
      try {
        ws = new WebSocket(url);
      } catch (_) {
        connected = false;
        startHttpPoll();
        scheduleReconnect();
        resolve(false);
        return;
      }

      ws.onopen = () => {
        connected = true;
        reconnectDelay = 1000;
        stopHttpPoll();
        send({ type: 'auth', token });
        registerPeer();
        resolve(true);
      };

      ws.onmessage = (ev) => {
        try {
          const msg = JSON.parse(ev.data);
          if (msg && msg.type) emit(msg.type, msg);
        } catch (_) { /* ignore */ }
      };

      ws.onclose = () => {
        connected = false;
        ws = null;
        startHttpPoll();
        scheduleReconnect();
      };

      ws.onerror = () => {
        connected = false;
      };
    });
  }

  BackOneNetworkSession.subscribe(() => {
    if (connected) registerPeer();
  });

  return {
    connect,
    send,
    subscribe,
    isConnected: () => connected,
    getSelfPeerId: () => selfPeerId,
    registerPeer
  };
})();