// static/js/12-calls.js
"use strict";

window.Glow = window.Glow || {};

Glow.calls = Glow.calls || {};

Glow.calls.iceServers = [
  { urls: "stun:stun.l.google.com:19302" },
  { urls: "stun:stun1.l.google.com:19302" }
];

Glow.getActiveDmPeer = () => {
  if (!Glow.state.activeDm || !Glow.state.currentUser) return null;

  return (Glow.state.activeDm.members || []).find(
    member => Number(member.id) !== Number(Glow.state.currentUser.id)
  ) || null;
};

Glow.renderCallUi = () => {
  const call = Glow.state.calls.activeCall;
  const hasCall = Boolean(call);
  const incoming = Glow.state.calls.incomingCall;
  const peer = Glow.getActiveDmPeer();

  if (!Glow.els.callStatus) return;

  Glow.els.callPeerLabel.textContent =
    peer?.display_name || peer?.username || "No active call";

  Glow.els.callStatus.textContent = incoming
    ? "Incoming call"
    : hasCall
      ? call.active
        ? "In call"
        : "Ended"
      : "Idle";

  Glow.els.startCallButton?.classList.toggle(
    "hidden",
    !Glow.state.activeDm || hasCall || Boolean(incoming)
  );

  Glow.els.answerCallButton?.classList.toggle("hidden", !incoming);

  Glow.els.muteCallButton?.classList.toggle("hidden", !hasCall);
  Glow.els.hangupCallButton?.classList.toggle("hidden", !hasCall && !incoming);

  Glow.els.muteCallButton.textContent =
    Glow.state.calls.muted ? "Unmute" : "Mute";
};

Glow.openCallPanel = () => {
  Glow.els.callOverlay?.classList.remove("hidden");
  Glow.renderCallUi();
};

Glow.endLocalCallUi = async () => {
  try {
    if (Glow.state.calls.peerConnection) {
      Glow.state.calls.peerConnection.onicecandidate = null;
      Glow.state.calls.peerConnection.ontrack = null;
      Glow.state.calls.peerConnection.close();
    }
  } catch (_) {}

  try {
    if (Glow.state.calls.localStream) {
      for (const track of Glow.state.calls.localStream.getTracks()) {
        track.stop();
      }
    }
  } catch (_) {}

  Glow.state.calls.peerConnection = null;
  Glow.state.calls.localStream = null;
  Glow.state.calls.activeCall = null;
  Glow.state.calls.incomingCall = null;
  Glow.state.calls.pendingOffer = null;
  Glow.state.calls.signalLastSeenId = 0;
  Glow.state.calls.muted = false;

  clearTimeout(Glow.state.calls.pollTimer);

  if (Glow.els.remoteAudio) {
    Glow.els.remoteAudio.srcObject = null;
  }

  Glow.renderCallUi();
};

Glow.ensurePeerConnection = async () => {
  if (Glow.state.calls.peerConnection) {
    return Glow.state.calls.peerConnection;
  }

  const pc = new RTCPeerConnection({
    iceServers: Glow.calls.iceServers
  });

  pc.onicecandidate = async event => {
    if (!event.candidate || !Glow.state.calls.activeCall) return;

    try {
      await Glow.apiPostCallSignal(Glow.state.calls.activeCall.id, {
        signal_type: "ice",
        payload: { candidate: event.candidate }
      });
    } catch (_) {}
  };

  pc.ontrack = event => {
    const stream = event.streams?.[0];
    if (stream && Glow.els.remoteAudio) {
      Glow.els.remoteAudio.srcObject = stream;
    }
  };

  Glow.state.calls.peerConnection = pc;
  return pc;
};

Glow.ensureLocalAudio = async () => {
  if (Glow.state.calls.localStream) {
    return Glow.state.calls.localStream;
  }

  const stream = await navigator.mediaDevices.getUserMedia({
    audio: true,
    video: false
  });

  Glow.state.calls.localStream = stream;
  return stream;
};

Glow.attachLocalTracks = async () => {
  const pc = await Glow.ensurePeerConnection();
  const stream = await Glow.ensureLocalAudio();

  const existingSenders = pc.getSenders().map(sender => sender.track).filter(Boolean);

  for (const track of stream.getTracks()) {
    if (!existingSenders.includes(track)) {
      pc.addTrack(track, stream);
    }
  }
};

Glow.startCall = async () => {
  if (!Glow.state.activeDm) {
    Glow.showToast("Open a DM to start a call.", "error");
    return;
  }

  if (!navigator.mediaDevices?.getUserMedia || !window.RTCPeerConnection) {
    Glow.showToast("Voice calls are not supported in this browser.", "error");
    return;
  }

  try {
    const data = await Glow.apiCreateCall(Glow.state.activeDm.id);
    Glow.state.calls.activeCall = data.call;
    Glow.state.calls.incomingCall = null;
    Glow.state.calls.pendingOffer = null;
    Glow.state.calls.signalLastSeenId = 0;

    Glow.openCallPanel();
    await Glow.attachLocalTracks();

    const pc = await Glow.ensurePeerConnection();
    const offer = await pc.createOffer();
    await pc.setLocalDescription(offer);

    await Glow.apiPostCallSignal(data.call.id, {
      signal_type: "offer",
      payload: { sdp: offer }
    });

    await Glow.apiPostCallSignal(data.call.id, {
      signal_type: "ring",
      payload: {}
    });

    Glow.renderCallUi();
    Glow.scheduleCallPolling();
  } catch (error) {
    Glow.showToast(error.message || "Could not start call.", "error");
    await Glow.endLocalCallUi();
  }
};

Glow.answerIncomingCall = async () => {
  const incoming = Glow.state.calls.incomingCall;
  const pendingOffer = Glow.state.calls.pendingOffer;

  if (!incoming || !pendingOffer) return;

  try {
    Glow.state.calls.activeCall = incoming;
    Glow.state.calls.incomingCall = null;
    Glow.openCallPanel();

    await Glow.attachLocalTracks();

    const pc = await Glow.ensurePeerConnection();
    await pc.setRemoteDescription(new RTCSessionDescription(pendingOffer));

    const answer = await pc.createAnswer();
    await pc.setLocalDescription(answer);

    await Glow.apiPostCallSignal(incoming.id, {
      signal_type: "answer",
      payload: { sdp: answer }
    });

    Glow.state.calls.pendingOffer = null;
    Glow.renderCallUi();
    Glow.scheduleCallPolling();
  } catch (error) {
    Glow.showToast(error.message || "Could not answer call.", "error");
    await Glow.endLocalCallUi();
  }
};

Glow.handleCallSignal = async signal => {
  const activeCall = Glow.state.calls.activeCall;
  const incomingCall = Glow.state.calls.incomingCall;

  if (signal.signal_type === "ring") {
    if (!activeCall && !incomingCall) {
      try {
        const data = await Glow.apiGetCall(signal.call_session_id);
        Glow.state.calls.incomingCall = data.call;
        Glow.openCallPanel();
        Glow.renderCallUi();
      } catch (_) {}
    }
    return;
  }

  if (signal.signal_type === "offer") {
    try {
      const data = await Glow.apiGetCall(signal.call_session_id);
      Glow.state.calls.incomingCall = data.call;
      Glow.state.calls.pendingOffer = signal.payload?.sdp || signal.payload;
      Glow.openCallPanel();
      Glow.renderCallUi();
    } catch (_) {}
    return;
  }

  if (!Glow.state.calls.activeCall || Number(Glow.state.calls.activeCall.id) !== Number(signal.call_session_id)) {
    return;
  }

  const pc = await Glow.ensurePeerConnection();

  if (signal.signal_type === "answer") {
    const sdp = signal.payload?.sdp || signal.payload;
    if (sdp) {
      await pc.setRemoteDescription(new RTCSessionDescription(sdp));
    }
    return;
  }

  if (signal.signal_type === "ice") {
    const candidate = signal.payload?.candidate || signal.payload;
    if (candidate) {
      try {
        await pc.addIceCandidate(new RTCIceCandidate(candidate));
      } catch (_) {}
    }
    return;
  }

  if (signal.signal_type === "hangup") {
    Glow.showToast("Call ended.");
    await Glow.endLocalCallUi();
    return;
  }
};

Glow.pollCallSignals = async () => {
  const activeCall = Glow.state.calls.activeCall;
  const incomingCall = Glow.state.calls.incomingCall;
  const call = activeCall || incomingCall;

  if (!call || document.hidden) return;

  try {
    const data = await Glow.apiGetCallSignals(
      call.id,
      Glow.state.calls.signalLastSeenId || 0
    );

    const signals = data.signals || [];

    for (const signal of signals) {
      Glow.state.calls.signalLastSeenId = Math.max(
        Glow.state.calls.signalLastSeenId || 0,
        Number(signal.id) || 0
      );

      if (
        Glow.state.currentUser &&
        Number(signal.user_id) === Number(Glow.state.currentUser.id)
      ) {
        continue;
      }

      await Glow.handleCallSignal(signal);
    }
  } catch (_) {}
};

Glow.scheduleCallPolling = () => {
  clearTimeout(Glow.state.calls.pollTimer);

  if (!Glow.state.calls.activeCall && !Glow.state.calls.incomingCall) {
    return;
  }

  Glow.state.calls.pollTimer = setTimeout(async () => {
    await Glow.pollCallSignals();
    Glow.scheduleCallPolling();
  }, document.hidden ? 5000 : 2000);
};

Glow.toggleMuteCall = () => {
  const stream = Glow.state.calls.localStream;
  if (!stream) return;

  Glow.state.calls.muted = !Glow.state.calls.muted;

  for (const track of stream.getAudioTracks()) {
    track.enabled = !Glow.state.calls.muted;
  }

  Glow.renderCallUi();
};

Glow.hangupCall = async () => {
  const call = Glow.state.calls.activeCall || Glow.state.calls.incomingCall;
  if (!call) return;

  try {
    await Glow.apiEndCall(call.id);
  } catch (_) {
    // ignore
  }

  Glow.showToast("Call ended.");
  await Glow.endLocalCallUi();
};

Glow.syncActiveCallForDm = async () => {
  if (!Glow.state.activeDm) return;

  try {
    const createResult = await Glow.apiCreateCall(Glow.state.activeDm.id);
    const call = createResult.call;

    if (call?.active) {
      Glow.state.calls.activeCall = call;
      Glow.renderCallUi();
      Glow.scheduleCallPolling();
    }
  } catch (_) {
    // ignore if no active call semantics vary
  }
};

Glow.els.startCallButton?.addEventListener("click", () => {
  Glow.startCall?.();
});

Glow.els.answerCallButton?.addEventListener("click", () => {
  Glow.answerIncomingCall?.();
});

Glow.els.muteCallButton?.addEventListener("click", () => {
  Glow.toggleMuteCall?.();
});

Glow.els.hangupCallButton?.addEventListener("click", () => {
  Glow.hangupCall?.();
});