// static/js/12-calls.js
"use strict";
window.Glow = window.Glow || {};
Glow.calls = Glow.calls || {};

Glow.calls.DEBUG = false;

Glow.calls.debug = (...args) => {
  if (!Glow.calls.DEBUG) return;
  console.debug("[calls]", ...args);
};

Glow.calls.state = () => Glow.state.calls;

Glow.calls.ensureState = () => {
  const state = Glow.calls.state();
  state.activeCall ||= null;
  state.ws ||= null;
  state.session ||= null;
  state.localStream ||= null;
  state.muted ||= false;
  state.selfPeerId ||= null;
  state.peerConnections ||= new Map();
  state.remoteStreams ||= new Map();
  state.participantAudioEls ||= new Map();
  state.peers ||= [];
  state.reconnectTimer ||= null;
  state.invitePollTimer ||= null;
  state.participantPollTimer ||= null;
  state.heartbeatTimer ||= null;
  state.invites ||= [];
  state.reconnecting ||= false;
  state.joining ||= false;
  state.leaving ||= false;
  state.permissions ||= {
    can_manage: false,
    can_end: false,
    can_invite: false
  };
  state.backendParticipants ||= [];
  state.scope ||= null;
  state.statusText ||= "idle";
  state.makingOffer ||= new Map();
  state.ignoreOffer ||= new Map();
  state.isSettingRemoteAnswerPending ||= new Map();
  state.panelOpen ??= false;

  state.drag ||= {
    active: false,
    x: null,
    y: null,
    offsetX: 0,
    offsetY: 0
  };
};

Glow.calls.scopeLabel = invite => {
  if (!invite) return "call";
  if (invite.scope_kind === "channel") {
    return `channel ${invite.scope_slug}`;
  }
  return `room ${invite.scope_slug}`;
};

Glow.calls.getCurrentScope = () => {
  if (Glow.state.activeTeam && Glow.state.activeChannel) {
    return {
      scope_kind: "channel",
      team_slug: Glow.state.activeTeam.slug,
      channel_slug: Glow.state.activeChannel.slug,
      label: `# ${Glow.state.activeChannel.name}`
    };
  }
  if (Glow.state.activeRoom) {
    return {
      scope_kind: "room",
      room_slug: Glow.state.activeRoom.slug,
      label: Glow.state.activeRoom.name
    };
  }
  return null;
};

Glow.calls.isGroupCallContext = () => {
  return Boolean(Glow.calls.getCurrentScope());
};

Glow.calls.wsReady = () => {
  const ws = Glow.calls.state().ws;
  return Boolean(ws && ws.readyState === WebSocket.OPEN);
};

Glow.calls.sendSignal = payload => {
  const ws = Glow.calls.state().ws;
  if (!ws || ws.readyState !== WebSocket.OPEN) {
    Glow.calls.debug("sendSignal skipped, ws not open", payload);
    return false;
  }
  Glow.calls.debug("sendSignal", payload);
  ws.send(JSON.stringify(payload));
  return true;
};

Glow.calls.replaceHttpWs = url =>
  url.replace(/^https:/, "wss:").replace(/^http:/, "ws:");

Glow.calls.setStatusText = text => {
  Glow.calls.ensureState();
  Glow.calls.state().statusText = String(text || "");
  Glow.calls.debug("status:", text);
  Glow.renderCallUi();
};

Glow.calls.browserSupportError = () => {
  if (!window.isSecureContext) {
    return "Voice calls require a secure https connection.";
  }
  if (!navigator.mediaDevices || typeof navigator.mediaDevices.getUserMedia !== "function") {
    return "This browser does not provide microphone access support.";
  }
  if (typeof window.RTCPeerConnection !== "function") {
    return "This browser does not support WebRTC voice calls.";
  }
  return "";
};

Glow.calls.isPolitePeer = peerId => {
  const selfPeerId = String(Glow.calls.state().selfPeerId || "");
  const otherPeerId = String(peerId || "");
  if (!selfPeerId || !otherPeerId) return true;
  return selfPeerId.localeCompare(otherPeerId) > 0;
};

Glow.calls.ensureRemoteAudioElement = peerId => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  if (!Glow.els.remoteAudioContainer) return null;

  let audio = state.participantAudioEls.get(peerId);
  if (audio) return audio;

  audio = document.createElement("audio");
  audio.autoplay = true;
  audio.playsInline = true;
  audio.dataset.peerId = String(peerId);
  Glow.els.remoteAudioContainer.append(audio);
  state.participantAudioEls.set(peerId, audio);
  Glow.calls.debug("created remote audio element for peer", peerId);
  return audio;
};

Glow.calls.removeRemoteAudioElement = peerId => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  const audio = state.participantAudioEls.get(peerId);
  if (!audio) return;
  audio.srcObject = null;
  audio.remove();
  state.participantAudioEls.delete(peerId);
  Glow.calls.debug("removed remote audio element for peer", peerId);
};

Glow.calls.syncRemoteAudioElements = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  for (const [peerId, stream] of state.remoteStreams.entries()) {
    const audio = Glow.calls.ensureRemoteAudioElement(peerId);
    if (audio && audio.srcObject !== stream) {
      audio.srcObject = stream;
      Glow.calls.debug("bound remote stream to audio", peerId);
    }
  }

  for (const peerId of [...state.participantAudioEls.keys()]) {
    if (!state.remoteStreams.has(peerId)) {
      Glow.calls.removeRemoteAudioElement(peerId);
    }
  }
};

Glow.calls.upsertPeer = peer => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  const peers = state.peers || [];
  const participantId =
    peer.participantId || peer.peer_id || peer.peerId || peer.id;
  if (!participantId) return;

  const normalized = {
    participantId,
    roomId: peer.roomId || peer.room_id || state.session?.call_id || "",
    username: peer.username || participantId,
    connectionState: peer.connectionState || "connecting"
  };

  const index = peers.findIndex(item => item.participantId === participantId);
  if (index >= 0) {
    peers[index] = { ...peers[index], ...normalized };
  } else {
    peers.push(normalized);
  }
  state.peers = peers;
  Glow.calls.debug("upsertPeer", normalized);
};

Glow.calls.removePeerConnection = peerId => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  const pc = state.peerConnections.get(peerId);
  if (pc) {
    try {
      pc.close();
    } catch (_) {}
  }

  state.peerConnections.delete(peerId);
  state.remoteStreams.delete(peerId);
  state.makingOffer.delete(peerId);
  state.ignoreOffer.delete(peerId);
  state.isSettingRemoteAnswerPending.delete(peerId);
  Glow.calls.removeRemoteAudioElement(peerId);
  Glow.calls.syncRemoteAudioElements();
  Glow.calls.debug("removed peer connection", peerId);
};

Glow.calls.removePeer = peerId => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  state.peers = (state.peers || []).filter(peer => peer.participantId !== peerId);
  Glow.calls.removePeerConnection(peerId);
  Glow.calls.debug("removed peer", peerId);
};

Glow.calls.listOtherPeers = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  return (state.peers || []).filter(peer => peer.participantId !== state.selfPeerId);
};

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

  try {
    Glow.calls.debug("requesting local microphone");
    const stream = await navigator.mediaDevices.getUserMedia({
      audio: true,
      video: false
    });
    state.localStream = stream;
    Glow.calls.debug("microphone ready");
    return stream;
  } catch (error) {
    Glow.calls.debug("getUserMedia failed", error);
    if (error?.name === "NotAllowedError" || error?.name === "PermissionDeniedError") {
      const ua = navigator.userAgent || "";
      if (/librewolf/i.test(ua)) {
        throw new Error("Microphone permission was denied. In LibreWolf, click the lock icon in the address bar and allow microphone access for this site.");
      }
      throw new Error("Microphone permission was denied.");
    }
    if (error?.name === "NotFoundError" || error?.name === "DevicesNotFoundError") {
      throw new Error("No microphone was found on this device.");
    }
    if (error?.name === "NotReadableError" || error?.name === "TrackStartError") {
      throw new Error("The microphone is already in use by another application.");
    }
    if (error?.name === "SecurityError") {
      throw new Error("Microphone access is blocked by browser security settings.");
    }
    throw new Error("Could not access your microphone.");
  }
};

Glow.calls.ensurePeerConnection = async peerId => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  if (state.peerConnections.has(peerId)) {
    return state.peerConnections.get(peerId);
  }

  Glow.calls.debug("creating peer connection", peerId);

  const pc = new RTCPeerConnection({
    iceServers: state.session?.iceServers || []
  });

  pc.onicecandidate = event => {
    if (!event.candidate) return;
    Glow.calls.debug("ice candidate", peerId, event.candidate);
    Glow.calls.sendSignal({
      type: "ice",
      to: peerId,
      candidate: event.candidate.candidate,
      sdpMid: event.candidate.sdpMid,
      sdpMLineIndex: event.candidate.sdpMLineIndex
    });
  };

  pc.ontrack = event => {
    const stream = event.streams?.[0];
    if (!stream) return;
    Glow.calls.debug("received remote track", peerId, stream);
    state.remoteStreams.set(peerId, stream);
    Glow.calls.syncRemoteAudioElements();
  };

  pc.onconnectionstatechange = () => {
    const nextState = pc.connectionState || "connecting";
    Glow.calls.debug("pc connection state", peerId, nextState);

    const peer = state.peers.find(item => item.participantId === peerId);
    if (peer) {
      peer.connectionState = nextState;
    }

    const bad =
      nextState === "failed" ||
      nextState === "disconnected";
    if (bad) {
      Glow.showToast(`Connection issue with ${peerId}.`, "error");
    }

    Glow.calls.renderParticipants();
    Glow.calls.updateSummaryMetrics();
  };

  pc.onsignalingstatechange = () => {
    Glow.calls.debug("pc signaling state", peerId, pc.signalingState);
  };

  pc.oniceconnectionstatechange = () => {
    Glow.calls.debug("pc ice connection state", peerId, pc.iceConnectionState);
  };

  state.peerConnections.set(peerId, pc);
  state.makingOffer.set(peerId, false);
  state.ignoreOffer.set(peerId, false);
  state.isSettingRemoteAnswerPending.set(peerId, false);

  const stream = await Glow.calls.ensureLocalAudio();
  const existingTracks = pc.getSenders().map(sender => sender.track).filter(Boolean);

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

  return pc;
};

Glow.calls.makeOfferTo = async peerId => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  Glow.calls.debug("making offer to peer", peerId);
  const pc = await Glow.calls.ensurePeerConnection(peerId);

  if (pc.signalingState !== "stable") {
    Glow.calls.debug("skipping offer because pc not stable", {
      peerId,
      signalingState: pc.signalingState
    });
    return;
  }

  try {
    state.makingOffer.set(peerId, true);
    const offer = await pc.createOffer();
    if (pc.signalingState !== "stable") {
      Glow.calls.debug("skipping localDescription because signaling changed", {
        peerId,
        signalingState: pc.signalingState
      });
      return;
    }
    await pc.setLocalDescription(offer);
    Glow.calls.sendSignal({
      type: "offer",
      to: peerId,
      sdp: pc.localDescription?.sdp || offer.sdp
    });
  } finally {
    state.makingOffer.set(peerId, false);
  }
};

Glow.calls.callAllPeers = async () => {
  const peers = Glow.calls.listOtherPeers();
  if (!peers.length) {
    Glow.showToast("No peers available yet.", "error");
    return;
  }

  for (const peer of peers) {
    try {
      await Glow.calls.makeOfferTo(peer.participantId);
    } catch (error) {
      Glow.calls.debug("makeOfferTo failed", peer.participantId, error);
    }
  }
};

Glow.calls.fetchGroupCallSession = async scope => {
  Glow.calls.debug("fetchGroupCallSession", scope);

  const data = await Glow.apiRequest("/api/group-calls/token", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(scope)
  });

  let helperResp;
  try {
    helperResp = await fetch(`${data.calls_base}/api/call/session`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ token: data.token })
    });
  } catch (error) {
    Glow.calls.debug("helper fetch failed", error);
    throw new Error("Could not reach the call helper service.");
  }

  let helperData = {};
  try {
    helperData = await helperResp.json();
  } catch (error) {
    Glow.calls.debug("helper json parse failed", error);
  }

  if (!helperResp.ok || !helperData.ok) {
    Glow.calls.debug("helper returned error", helperResp.status, helperData);
    throw new Error(helperData.error || `Call helper failed (${helperResp.status})`);
  }

  helperData.calls_base = data.calls_base;
  helperData.group_session = data.session;
  helperData.participants = data.participants || [];
  helperData.permissions = data.permissions || {
    can_manage: false,
    can_end: false,
    can_invite: false
  };
  helperData.scope = data.scope || null;
  Glow.calls.debug("helper session ready", helperData);
  return helperData;
};

Glow.calls.renderPendingInvites = () => {
  const wrap = Glow.els.callPendingInvites;
  if (!wrap) return;

  wrap.replaceChildren();

  const activeCallId = Glow.state.calls.activeCall?.groupSession?.id;
  const relevant = (Glow.state.calls.invites || []).filter(
    invite => Number(invite.group_call_session_id) === Number(activeCallId)
  );

  if (!relevant.length) {
    wrap.classList.add("hidden");
    return;
  }

  const title = document.createElement("div");
  title.className = "call-pending-title";
  title.textContent = "Pending invites";
  wrap.append(title);

  for (const invite of relevant) {
    const row = document.createElement("div");
    row.className = "call-pending-row";

    const left = document.createElement("div");
    left.className = "call-pending-name";
    left.textContent = invite.inviter_username
      ? `from ${invite.inviter_username}`
      : "pending invite";

    const right = document.createElement("div");
    right.className = "call-pending-status";
    right.textContent = "pending";

    row.append(left, right);
    wrap.append(row);
  }

  wrap.classList.remove("hidden");
};

Glow.calls.getParticipantStateLabel = peer => {
  const state = String(peer?.connectionState || "").toLowerCase();
  if (state === "connected") return "active";
  if (state === "connecting" || state === "new") return "connecting";
  if (state === "disconnected") return "disconnected";
  if (state === "failed") return "reconnecting";
  return "joined";
};

Glow.calls.renderParticipants = () => {
  if (!Glow.els.callParticipants) return;

  Glow.calls.ensureState();
  const state = Glow.calls.state();
  const box = Glow.els.callParticipants;
  box.replaceChildren();

  const backendParticipants = Array.isArray(state.backendParticipants)
    ? state.backendParticipants
    : [];
  const peerMap = new Map(
    (state.peers || []).map(peer => [String(peer.participantId), peer])
  );

  const selfRow = document.createElement("div");
  selfRow.className = "call-participant self";

  const selfLeft = document.createElement("div");
  selfLeft.className = "call-participant-name";
  selfLeft.textContent =
    Glow.state.currentUser?.username
      ? `${Glow.state.currentUser.username} (you)`
      : "you";

  const selfRight = document.createElement("div");
  selfRight.className = "call-participant-status";
  selfRight.textContent = state.activeCall
    ? state.muted
      ? "connected · muted"
      : "connected"
    : "idle";

  selfRow.append(selfLeft, selfRight);
  box.append(selfRow);

  const renderedUserIds = new Set();
  if (Glow.state.currentUser?.id) {
    renderedUserIds.add(String(Glow.state.currentUser.id));
  }

  for (const participant of backendParticipants) {
    const userId = String(participant.user_id);
    if (renderedUserIds.has(userId)) continue;
    renderedUserIds.add(userId);

    const row = document.createElement("div");
    row.className = "call-participant";

    const left = document.createElement("button");
    left.className = "call-participant-name profile-link";
    left.type = "button";
    left.textContent =
      participant.display_name || participant.username || `user ${participant.user_id}`;
    Glow.applyUserColor(left, participant);
    if (participant.username) {
      left.addEventListener("click", () => {
        Glow.openProfile?.(participant.username);
      });
    }

    const right = document.createElement("div");
    right.className = "call-participant-status";

    const matchingPeer = [...peerMap.values()].find(peer => {
      return (
        String(peer.username || "").toLowerCase() ===
          String(participant.username || "").toLowerCase()
      );
    });

    const label = Glow.calls.getParticipantStateLabel(matchingPeer);
    right.textContent = label;
    right.dataset.state = label;

    row.append(left, right);
    box.append(row);
  }

  const extraPeers = Glow.calls.listOtherPeers().filter(peer => {
    return !backendParticipants.some(
      participant =>
        String(participant.username || "").toLowerCase() ===
        String(peer.username || "").toLowerCase()
    );
  });

  for (const peer of extraPeers) {
    const row = document.createElement("div");
    row.className = "call-participant";

    const left = document.createElement("button");
    left.className = "call-participant-name profile-link";
    left.type = "button";
    left.textContent = peer.username || peer.participantId;
    if (peer.username) {
      left.addEventListener("click", () => {
        Glow.openProfile?.(peer.username);
      });
    }

    const right = document.createElement("div");
    right.className = "call-participant-status";
    const label = Glow.calls.getParticipantStateLabel(peer);
    right.textContent = label;
    right.dataset.state = label;

    row.append(left, right);
    box.append(row);
  }

  if (box.children.length === 1 && state.activeCall) {
    const empty = document.createElement("div");
    empty.className = "call-participant";
    const label = document.createElement("div");
    label.className = "call-participant-name";
    label.textContent = "waiting for others to join";
    empty.append(label);
    box.append(empty);
  }
};

Glow.calls.updateSummaryMetrics = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  const createdAt =
    state.activeCall?.groupSession?.created_at ||
    state.session?.group_session?.created_at ||
    null;

  let elapsedSeconds = 0;
  if (createdAt) {
    const ms = new Date(createdAt).getTime();
    if (!Number.isNaN(ms)) {
      elapsedSeconds = Math.max(0, Math.floor((Date.now() - ms) / 1000));
    }
  }

  state.metrics.elapsedSeconds = elapsedSeconds;
  state.metrics.userCount =
    1 + Glow.calls.listOtherPeers().length;

  if (Glow.els.callUserCountStat) {
    Glow.els.callUserCountStat.textContent = String(state.metrics.userCount);
  }

  if (Glow.els.callElapsedStat) {
    const minutes = Math.floor(elapsedSeconds / 60);
    const seconds = elapsedSeconds % 60;
    Glow.els.callElapsedStat.textContent =
      minutes > 0 ? `${minutes}m ${seconds}s` : `${seconds}s`;
  }

  if (Glow.els.callLatencyStat) {
    Glow.els.callLatencyStat.textContent =
      state.metrics.latency == null ? "—" : `${state.metrics.latency} ms`;
  }

  if (Glow.els.callPacketLossStat) {
    Glow.els.callPacketLossStat.textContent =
      state.metrics.packetLoss == null ? "—" : `${state.metrics.packetLoss}%`;
  }

  if (Glow.els.callUptimeStat) {
    Glow.els.callUptimeStat.textContent =
      state.metrics.uptime == null ? "—" : `${state.metrics.uptime}%`;
  }
};

Glow.calls.connectWebSocket = async () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  if (!state.session?.ws_url) {
    throw new Error("Missing helper WebSocket URL.");
  }

  const wsUrl = Glow.calls.replaceHttpWs(state.session.ws_url);
  Glow.calls.debug("connecting websocket", wsUrl);

  return new Promise((resolve, reject) => {
    const ws = new WebSocket(wsUrl);
    state.ws = ws;
    let settled = false;

    ws.onopen = () => {
      Glow.calls.debug("websocket open");
      state.reconnecting = false;
      state.joining = false;
      Glow.calls.setStatusText("Connected");
      Glow.calls.updateSummaryMetrics();
      settled = true;
      resolve();
    };

    ws.onerror = error => {
      Glow.calls.debug("websocket error", error);
      if (!settled) {
        settled = true;
        reject(new Error("Could not connect to the call signaling service."));
      }
    };

    ws.onclose = event => {
      Glow.calls.debug("websocket close", event.code, event.reason);
      if (!settled) {
        settled = true;
        reject(new Error("Call signaling connection closed before it was ready."));
      }
      if (state.activeCall) {
        Glow.calls.scheduleReconnect();
      }
    };

    ws.onmessage = async event => {
      let signal;
      try {
        signal = JSON.parse(event.data);
      } catch (_) {
        Glow.calls.debug("ignoring non-json ws message");
        return;
      }

      Glow.calls.debug("ws message", signal);

      if (signal.type === "joined") {
        state.selfPeerId = signal.participantId;
        Glow.calls.setStatusText("Call connected");
        Glow.calls.updateSummaryMetrics();
        Glow.renderCallUi();
        Glow.calls.renderParticipants();
        return;
      }

      if (signal.type === "participant-joined") {
        state.ignoreOffer.set(signal.participantId, false);
        Glow.calls.upsertPeer({
          participantId: signal.participantId,
          roomId: signal.roomId,
          username: signal.username || signal.participantId,
          connectionState: "connecting"
        });
        Glow.calls.updateSummaryMetrics();
        Glow.renderCallUi();
        Glow.calls.renderParticipants();

        if (signal.participantId && signal.participantId !== state.selfPeerId) {
          try {
            await Glow.calls.makeOfferTo(signal.participantId);
          } catch (error) {
            Glow.calls.debug("offer on participant-joined failed", error);
          }
        }
        return;
      }

      if (signal.type === "participant-left") {
        Glow.calls.removePeer(signal.participantId);
        Glow.calls.updateSummaryMetrics();
        Glow.renderCallUi();
        Glow.calls.renderParticipants();
        Glow.showToast("Peer left call.");
        return;
      }

      if (signal.type === "peer-reconnected") {
        Glow.showToast("Peer reconnected.");
        return;
      }

      if (signal.type === "reoffer-needed") {
        if (signal.participantId) {
          try {
            await Glow.calls.makeOfferTo(signal.participantId);
          } catch (error) {
            Glow.calls.debug("reoffer-needed failed", error);
          }
        }
        return;
      }

      if (signal.type === "offer") {
        const from = signal.from;
        if (!from) return;

        Glow.calls.upsertPeer({
          participantId: from,
          roomId: signal.roomId,
          username: signal.username || from,
          connectionState: "connecting"
        });
        Glow.calls.renderParticipants();

        const pc = await Glow.calls.ensurePeerConnection(from);
        const polite = Glow.calls.isPolitePeer(from);
        const makingOffer = Boolean(state.makingOffer.get(from));
        const isSettingRemoteAnswerPending = Boolean(state.isSettingRemoteAnswerPending.get(from));
        const offerCollision =
          makingOffer ||
          (pc.signalingState !== "stable" && !isSettingRemoteAnswerPending);

        state.ignoreOffer.set(from, !polite && offerCollision);

        Glow.calls.debug("received offer", {
          from,
          polite,
          makingOffer,
          signalingState: pc.signalingState,
          isSettingRemoteAnswerPending,
          offerCollision,
          ignoreOffer: state.ignoreOffer.get(from)
        });

        if (state.ignoreOffer.get(from)) {
          Glow.calls.debug("ignoring incoming offer due to collision", { from });
          return;
        }

        try {
          if (offerCollision) {
            await Promise.all([
              pc.setLocalDescription({ type: "rollback" }),
              pc.setRemoteDescription({ type: "offer", sdp: signal.sdp })
            ]);
          } else {
            await pc.setRemoteDescription({ type: "offer", sdp: signal.sdp });
          }

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

          Glow.calls.sendSignal({
            type: "answer",
            to: from,
            sdp: pc.localDescription?.sdp || answer.sdp
          });
        } catch (error) {
          Glow.calls.debug("offer handling failed", {
            from,
            signalingState: pc.signalingState,
            error: error?.message || String(error)
          });
        }
        return;
      }

      if (signal.type === "answer") {
        const from = signal.from;
        if (!from) return;

        const pc = await Glow.calls.ensurePeerConnection(from);

        Glow.calls.debug("received answer", {
          from,
          signalingState: pc.signalingState,
          connectionState: pc.connectionState
        });

        if (pc.signalingState !== "have-local-offer") {
          Glow.calls.debug("ignoring unexpected answer", {
            from,
            signalingState: pc.signalingState
          });
          return;
        }

        try {
          state.isSettingRemoteAnswerPending.set(from, true);
          await pc.setRemoteDescription({ type: "answer", sdp: signal.sdp });
        } catch (error) {
          Glow.calls.debug("setRemoteDescription(answer) failed", {
            from,
            signalingState: pc.signalingState,
            error: error?.message || String(error)
          });
        } finally {
          state.isSettingRemoteAnswerPending.set(from, false);
        }
        return;
      }

      if (signal.type === "ice" || signal.type === "ice-candidate") {
        const from = signal.from;
        if (!from) return;

        const pc = await Glow.calls.ensurePeerConnection(from);

        try {
          await pc.addIceCandidate({
            candidate: signal.candidate,
            sdpMid: signal.sdpMid,
            sdpMLineIndex: signal.sdpMLineIndex
          });
        } catch (error) {
          const ignored = Boolean(state.ignoreOffer.get(from));
          if (!ignored) {
            Glow.calls.debug("addIceCandidate failed", {
              from,
              error: error?.message || String(error)
            });
          }
        }
      }
    };
  });
};

Glow.calls.resetTransportOnly = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  clearTimeout(state.reconnectTimer);

  try {
    if (state.ws) {
      state.ws.onopen = null;
      state.ws.onclose = null;
      state.ws.onerror = null;
      state.ws.onmessage = null;
      state.ws.close();
    }
  } catch (_) {}

  for (const [, pc] of state.peerConnections) {
    try {
      pc.onicecandidate = null;
      pc.ontrack = null;
      pc.onconnectionstatechange = null;
      pc.onsignalingstatechange = null;
      pc.oniceconnectionstatechange = null;
      pc.close();
    } catch (_) {}
  }

  for (const peerId of [...state.participantAudioEls.keys()]) {
    Glow.calls.removeRemoteAudioElement(peerId);
  }

  state.ws = null;
  state.peerConnections = new Map();
  state.remoteStreams = new Map();
  state.participantAudioEls = new Map();
  state.peers = [];
  state.selfPeerId = null;
  state.reconnectTimer = null;
  state.reconnecting = false;
  state.makingOffer = new Map();
  state.ignoreOffer = new Map();
  state.isSettingRemoteAnswerPending = new Map();

  Glow.calls.debug("resetTransportOnly complete");
};

Glow.calls.resetAll = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  clearTimeout(state.participantPollTimer);
  clearTimeout(state.heartbeatTimer);

  Glow.calls.resetTransportOnly();

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

  state.localStream = null;
  state.activeCall = null;
  state.session = null;
  state.muted = false;
  state.joining = false;
  state.leaving = false;
  state.backendParticipants = [];
  state.scope = null;
  state.statusText = "Idle";
  state.permissions = {
    can_manage: false,
    can_end: false,
    can_invite: false
  };
  state.panelOpen = false;
  state.metrics = {
    packetLoss: null,
    uptime: null,
    latency: null,
    elapsedSeconds: 0,
    userCount: 0
  };

  Glow.calls.debug("resetAll complete");
};

Glow.endLocalCallUi = async () => {
  Glow.calls.resetAll();
  Glow.state.calls.panelOpen = false;

  if (Glow.els.callParticipants) {
    Glow.els.callParticipants.replaceChildren();
    Glow.els.callParticipants.classList.add("hidden");
  }

  if (Glow.els.callPendingInvites) {
    Glow.els.callPendingInvites.replaceChildren();
    Glow.els.callPendingInvites.classList.add("hidden");
  }

  if (Glow.els.remoteAudioContainer) {
    Glow.els.remoteAudioContainer.replaceChildren();
  }

  Glow.els.callOverlay?.classList.add("hidden");

  Glow.renderCallUi();
  Glow.calls.renderHeaderCallChip();
};

Glow.calls.scheduleReconnect = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  clearTimeout(state.reconnectTimer);
  state.reconnecting = true;
  Glow.calls.setStatusText("Reconnecting...");
  Glow.renderCallUi();

  state.reconnectTimer = setTimeout(async () => {
    try {
      if (!state.activeCall) return;
      const scope = state.activeCall.scope || state.scope || Glow.calls.getCurrentScope();
      if (!scope) return;

      Glow.calls.debug("reconnect attempt", scope);
      Glow.calls.resetTransportOnly();
      Glow.calls.setStatusText("Reconnecting...");
      state.session = await Glow.calls.fetchGroupCallSession(scope);
      state.permissions = state.session.permissions || state.permissions;
      state.scope = state.session.scope || state.scope;
      if (state.session.group_session?.id) {
        await Glow.apiJoinGroupCall(state.session.group_session.id);
      }
      await Glow.calls.connectWebSocket();
      Glow.calls.startParticipantSync();
      Glow.calls.startHeartbeat();
      Glow.showToast("Call reconnected.");
      Glow.renderCallUi();
      Glow.calls.refreshBackendParticipants();
    } catch (error) {
      Glow.calls.debug("reconnect failed", error);
      Glow.calls.scheduleReconnect();
    }
  }, 2000);
};

Glow.calls.refreshBackendParticipants = async () => {
  Glow.calls.ensureState();
  const sessionId = Glow.state.calls.activeCall?.groupSession?.id;
  if (!sessionId) return;

  try {
    const data = await Glow.apiGetGroupCallParticipants(sessionId);
    Glow.state.calls.backendParticipants = data.participants || [];
    Glow.state.calls.permissions = data.permissions || Glow.state.calls.permissions;
    Glow.state.calls.scope = data.scope || Glow.state.calls.scope;
    Glow.calls.renderParticipants();
    Glow.calls.updateSummaryMetrics();
    Glow.renderCallUi();
    Glow.calls.debug("backend participants refreshed", data);
  } catch (error) {
    Glow.calls.debug("refreshBackendParticipants failed", error);
  }
};

Glow.calls.startParticipantSync = () => {
  Glow.calls.ensureState();
  clearTimeout(Glow.state.calls.participantPollTimer);

  const run = async () => {
    if (!Glow.state.calls.activeCall || document.hidden) {
      Glow.calls.startParticipantSync();
      return;
    }
    await Glow.calls.refreshBackendParticipants();
    Glow.calls.startParticipantSync();
  };

  Glow.state.calls.participantPollTimer = setTimeout(run, 5000);
};

Glow.calls.startHeartbeat = () => {
  Glow.calls.ensureState();
  clearTimeout(Glow.state.calls.heartbeatTimer);

  const run = async () => {
    const sessionId = Glow.state.calls.activeCall?.groupSession?.id;
    if (!sessionId) return;

    try {
      await Glow.apiHeartbeatGroupCall(sessionId);
      Glow.calls.debug("heartbeat ok", sessionId);
    } catch (error) {
      Glow.calls.debug("heartbeat failed", error);
    }

    Glow.calls.startHeartbeat();
  };

  Glow.state.calls.heartbeatTimer = setTimeout(run, 12000);
};

Glow.renderCallUi = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();

  const active = Boolean(state.activeCall);
  const busy = Boolean(state.activeCall || state.joining || state.reconnecting);
  const overlayVisible = Boolean(state.panelOpen || busy);
  const scope = state.activeCall?.scope || state.scope || Glow.calls.getCurrentScope();
  const peerCount = Glow.calls.listOtherPeers().length;

  if (!Glow.els.callStatus) return;

  Glow.els.callOverlay?.classList.toggle("hidden", !overlayVisible);

  Glow.els.callPeerLabel.textContent =
    scope?.label ||
    state.scope?.scope_label ||
    Glow.state.activeChannel?.name ||
    Glow.state.activeRoom?.name ||
    "No active call";

  let statusText = state.statusText || "Idle";

  if (!busy) {
    statusText = "Idle";
  } else if (state.joining) {
    statusText = "Joining call...";
  } else if (state.reconnecting) {
    statusText = "Reconnecting...";
  } else if (!Glow.calls.wsReady()) {
    statusText = "Connecting...";
  } else if (peerCount > 0) {
    statusText = `Group call active · ${peerCount} peer(s)`;
  } else {
    statusText = "Call open · waiting for others";
  }

  Glow.els.callStatus.textContent = statusText;

  Glow.els.startCallButton?.classList.toggle(
    "hidden",
    !Glow.calls.isGroupCallContext() || active || state.joining
  );

  Glow.els.retryCallButton?.classList.toggle(
    "hidden",
    !busy || !state.reconnecting
  );

  Glow.els.muteCallButton?.classList.toggle("hidden", !active);
  Glow.els.hangupCallButton?.classList.toggle("hidden", !active);

  Glow.els.addToCallButton?.classList.toggle(
    "hidden",
    !active || !state.permissions?.can_invite
  );

  Glow.els.endCallButton?.classList.toggle(
    "hidden",
    !active || !state.permissions?.can_end
  );

  if (Glow.els.muteCallButton) {
    Glow.els.muteCallButton.textContent = state.muted ? "Unmute" : "Mute";
  }

  if (Glow.els.callParticipants) {
    Glow.els.callParticipants.classList.toggle("hidden", !overlayVisible);
  }

  Glow.calls.updateSummaryMetrics();
  Glow.calls.renderParticipants();
  Glow.calls.renderPendingInvites();
  Glow.calls.renderHeaderCallChip();
};

Glow.calls.applyPanelPosition = () => {
  Glow.calls.ensureState();

  const overlay = Glow.els.callOverlay;
  const drag = Glow.state.calls?.drag;

  if (!overlay || !drag) return;
  if (!Number.isFinite(drag.x) || !Number.isFinite(drag.y)) return;

  overlay.style.left = `${drag.x}px`;
  overlay.style.top = `${drag.y}px`;
  overlay.style.right = "auto";
  overlay.style.bottom = "auto";
  overlay.style.alignItems = "flex-start";
  overlay.style.justifyContent = "flex-start";
};

Glow.calls.loadPanelPosition = () => {
  Glow.calls.ensureState();

  const drag = Glow.state.calls?.drag;
  if (!drag) return;

  const x = Number(localStorage.getItem("glow_call_panel_x"));
  const y = Number(localStorage.getItem("glow_call_panel_y"));

  if (!Number.isFinite(x) || !Number.isFinite(y)) return;

  drag.x = x;
  drag.y = y;

  Glow.calls.applyPanelPosition();
};

Glow.calls.savePanelPosition = () => {
  Glow.calls.ensureState();

  const drag = Glow.state.calls?.drag;
  if (!drag) return;
  if (!Number.isFinite(drag.x) || !Number.isFinite(drag.y)) return;

  localStorage.setItem("glow_call_panel_x", String(drag.x));
  localStorage.setItem("glow_call_panel_y", String(drag.y));
};

Glow.calls.beginDrag = event => {
  Glow.calls.ensureState();

  const overlay = Glow.els.callOverlay;
  const drag = Glow.state.calls?.drag;
  if (!overlay || !drag) return;

  const rect = overlay.getBoundingClientRect();
  drag.active = true;
  drag.x = rect.left;
  drag.y = rect.top;
  drag.offsetX = event.clientX - rect.left;
  drag.offsetY = event.clientY - rect.top;
};

Glow.calls.onDrag = event => {
  const drag = Glow.state.calls?.drag;
  const overlay = Glow.els.callOverlay;
  if (!drag?.active || !overlay) return;

  const maxX = Math.max(0, window.innerWidth - overlay.offsetWidth);
  const maxY = Math.max(0, window.innerHeight - overlay.offsetHeight);

  drag.x = Math.min(maxX, Math.max(0, event.clientX - drag.offsetX));
  drag.y = Math.min(maxY, Math.max(0, event.clientY - drag.offsetY));

  Glow.calls.applyPanelPosition();
};

Glow.calls.endDrag = () => {
  const drag = Glow.state.calls?.drag;
  if (!drag) return;
  if (!drag.active) return;

  drag.active = false;
  Glow.calls.savePanelPosition();
};

Glow.startCall = async () => {
  Glow.calls.ensureState();

  const scope = Glow.calls.getCurrentScope();
  if (!scope) {
    Glow.showToast("Open a room or channel to start a group call.", "error");
    return;
  }

  const supportError = Glow.calls.browserSupportError();
  if (supportError) {
    Glow.showToast(supportError, "error");
    return;
  }

  try {
    Glow.state.calls.joining = true;
    Glow.calls.setStatusText("Preparing call…");

    const session = await Glow.calls.fetchGroupCallSession(scope);
    Glow.state.calls.session = session;
    Glow.state.calls.activeCall = {
      id: session.call_id,
      active: true,
      scope,
      groupSession: session.group_session
    };
    Glow.state.calls.scope = session.scope || scope;
    Glow.state.calls.permissions = session.permissions || Glow.state.calls.permissions;
    Glow.state.calls.selfPeerId = session.peer_id || null;
    Glow.state.calls.peers = [];
    Glow.state.calls.peerConnections = new Map();
    Glow.state.calls.remoteStreams = new Map();
    Glow.state.calls.participantAudioEls = new Map();
    Glow.state.calls.backendParticipants = session.participants || [];
    Glow.state.calls.makingOffer = new Map();
    Glow.state.calls.ignoreOffer = new Map();
    Glow.state.calls.isSettingRemoteAnswerPending = new Map();
    Glow.state.calls.panelOpen = true;

    Glow.openCallPanel();
    Glow.calls.setStatusText("Connecting microphone…");
    await Glow.calls.ensureLocalAudio();
    Glow.calls.setStatusText("Joining call…");
    await Glow.apiJoinGroupCall(session.group_session.id);
    await Glow.calls.connectWebSocket();
    Glow.calls.startParticipantSync();
    Glow.calls.startHeartbeat();
    Glow.state.calls.joining = false;
    Glow.calls.updateSummaryMetrics();
    Glow.renderCallUi();
    Glow.showToast("Group call ready.");
  } catch (error) {
    Glow.calls.debug("startCall failed", error);
    Glow.state.calls.joining = false;
    Glow.showToast(error.message || "Could not start group call.", "error");
    await Glow.endLocalCallUi();
  }
};

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.calls.debug("mute toggled", Glow.state.calls.muted);
  Glow.renderCallUi();
};

Glow.leaveCall = async () => {
  Glow.calls.ensureState();
  const activeCall = Glow.state.calls.activeCall;
  if (!activeCall) return;

  Glow.state.calls.leaving = true;
  Glow.calls.setStatusText("Leaving call…");

  try {
    Glow.calls.sendSignal({ type: "hangup" });
  } catch (_) {}

  try {
    if (activeCall.groupSession?.id) {
      await Glow.apiLeaveGroupCall(activeCall.groupSession.id);
    }
  } catch (error) {
    Glow.calls.debug("leave call api failed", error);
  }

  Glow.showToast("Left call.");
  Glow.state.calls.leaving = false;
  await Glow.endLocalCallUi();
};

Glow.endCallForEveryone = async () => {
  Glow.calls.ensureState();
  const activeCall = Glow.state.calls.activeCall;
  if (!activeCall?.groupSession?.id) return;

  const values = await Glow.openDialog({
    title: "End call for everyone?",
    body: "This will end the active call session for all participants.",
    confirmText: "End call",
    cancelText: "Cancel",
    danger: true
  });

  if (!values) return;

  try {
    Glow.calls.setStatusText("Ending call…");
    await Glow.apiEndGroupCall(activeCall.groupSession.id);
    Glow.showToast("Call ended.");
    await Glow.endLocalCallUi();
  } catch (error) {
    Glow.calls.debug("endCallForEveryone failed", error);
    Glow.showToast(error.message || "Could not end call.", "error");
  }
};

Glow.hangupCall = async () => {
  await Glow.leaveCall();
};

Glow.calls.requestInvite = async username => {
  Glow.calls.ensureState();
  const activeCall = Glow.state.calls.activeCall;
  if (!activeCall?.groupSession?.id) {
    throw new Error("No active group call session.");
  }

  return Glow.apiInviteToGroupCall({
    group_call_session_id: activeCall.groupSession.id,
    username
  });
};

Glow.openAddToCallDialog = async () => {
  if (!Glow.state.calls.activeCall?.groupSession?.id) {
    Glow.showToast("Start a call first.", "error");
    return;
  }

  const values = await Glow.openDialog({
    title: "Add user to call",
    body: "Send a stored invite to another user for this room/channel call.",
    confirmText: "Send invite",
    fields: [
      {
        name: "username",
        label: "Username",
        placeholder: "username",
        maxLength: 30
      }
    ]
  });

  if (!values?.username) return;

  try {
    const result = await Glow.calls.requestInvite(values.username.trim().toLowerCase());
    Glow.showToast(`Invite sent to ${result.invite.invitee_username}.`);
  } catch (error) {
    Glow.calls.debug("requestInvite failed", error);
    Glow.showToast(error.message || "Could not send invite.", "error");
  }
};

Glow.calls.fetchInvites = async () => {
  Glow.calls.ensureState();
  if (!Glow.state.currentUser) return [];
  const data = await Glow.apiListGroupCallInvites();
  Glow.state.calls.invites = data.invites || [];
  Glow.calls.renderPendingInvites();
  return Glow.state.calls.invites;
};

Glow.calls.acceptInvite = async inviteId => {
  const data = await Glow.apiAcceptGroupCallInvite(inviteId);

  let helperResp;
  try {
    helperResp = await fetch(`${data.calls_base}/api/call/session`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ token: data.token })
    });
  } catch (error) {
    Glow.calls.debug("acceptInvite helper fetch failed", error);
    throw new Error("Could not reach the call helper service.");
  }

  let helperData = {};
  try {
    helperData = await helperResp.json();
  } catch (error) {
    Glow.calls.debug("acceptInvite helper json parse failed", error);
  }

  if (!helperResp.ok || !helperData.ok) {
    Glow.calls.debug("acceptInvite helper returned error", helperResp.status, helperData);
    throw new Error(helperData.error || `Call helper failed (${helperResp.status})`);
  }

  helperData.calls_base = data.calls_base;
  helperData.group_session = data.session;
  helperData.participants = data.participants || [];
  helperData.permissions = data.permissions || {
    can_manage: false,
    can_end: false,
    can_invite: false
  };
  helperData.scope = data.scope || null;
  return helperData;
};

Glow.calls.dismissInvite = async inviteId => {
  await Glow.apiDismissGroupCallInvite(inviteId);
};

Glow.calls.openIncomingInviteDialog = async invite => {
  const values = await Glow.openDialog({
    title: "Incoming group call invite",
    body: `${invite.inviter_username} invited you to join ${Glow.calls.scopeLabel(invite)}.`,
    confirmText: "Join call",
    cancelText: "Dismiss"
  });

  if (!values) {
    try {
      await Glow.calls.dismissInvite(invite.id);
    } catch (_) {}
    return;
  }

  try {
    const supportError = Glow.calls.browserSupportError();
    if (supportError) {
      throw new Error(supportError);
    }

    Glow.state.calls.joining = true;
    Glow.calls.setStatusText("Joining call…");

    const session = await Glow.calls.acceptInvite(invite.id);

    Glow.state.calls.session = session;
    Glow.state.calls.activeCall = {
      id: session.call_id,
      active: true,
      scope: null,
      groupSession: session.group_session
    };
    Glow.state.calls.scope = session.scope || null;
    Glow.state.calls.permissions = session.permissions || Glow.state.calls.permissions;
    Glow.state.calls.selfPeerId = session.peer_id || null;
    Glow.state.calls.peers = [];
    Glow.state.calls.peerConnections = new Map();
    Glow.state.calls.remoteStreams = new Map();
    Glow.state.calls.participantAudioEls = new Map();
    Glow.state.calls.backendParticipants = session.participants || [];
    Glow.state.calls.makingOffer = new Map();
    Glow.state.calls.ignoreOffer = new Map();
    Glow.state.calls.isSettingRemoteAnswerPending = new Map();
    Glow.state.calls.panelOpen = true;

    Glow.openCallPanel();
    Glow.calls.setStatusText("Connecting microphone…");
    await Glow.calls.ensureLocalAudio();
    if (session.group_session?.id) {
      Glow.calls.setStatusText("Joining call…");
      await Glow.apiJoinGroupCall(session.group_session.id);
    }
    await Glow.calls.connectWebSocket();
    Glow.calls.startParticipantSync();
    Glow.calls.startHeartbeat();
    Glow.state.calls.joining = false;
    Glow.calls.updateSummaryMetrics();
    Glow.renderCallUi();
    Glow.showToast("Joined group call.");
  } catch (error) {
    Glow.calls.debug("openIncomingInviteDialog failed", error);
    Glow.state.calls.joining = false;
    Glow.showToast(error.message || "Could not join group call.", "error");
  }
};

Glow.calls.pollInvites = async () => {
  Glow.calls.ensureState();
  if (!Glow.state.currentUser || document.hidden) return;

  try {
    const invites = await Glow.calls.fetchInvites();
    if (!invites.length) return;

    const invite = invites[0];
    await Glow.calls.openIncomingInviteDialog(invite);
  } catch (error) {
    Glow.calls.debug("pollInvites failed", error);
  }
};

Glow.calls.scheduleInvitePolling = () => {
  Glow.calls.ensureState();
  clearTimeout(Glow.state.calls.invitePollTimer);
  if (!Glow.state.currentUser) return;

  Glow.state.calls.invitePollTimer = setTimeout(async () => {
    await Glow.calls.pollInvites();
    Glow.calls.scheduleInvitePolling();
  }, document.hidden ? 12000 : 6000);
};

Glow.els.startCallButton?.addEventListener("click", async () => {
  if (!Glow.state.calls.activeCall) {
    await Glow.startCall();
    return;
  }
  await Glow.calls.callAllPeers();
});

Glow.els.retryCallButton?.addEventListener("click", async () => {
  clearTimeout(Glow.state.calls.reconnectTimer);
  Glow.calls.scheduleReconnect();
});

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

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

Glow.els.endCallButton?.addEventListener("click", () => {
  Glow.endCallForEveryone?.();
});

Glow.els.addToCallButton?.addEventListener("click", () => {
  Glow.openAddToCallDialog?.();
});

Glow.els.callDragHandle?.addEventListener("mousedown", event => {
  if (event.button !== 0) return;
  event.preventDefault();
  Glow.calls.beginDrag(event);
});

document.addEventListener("mousemove", event => {
  Glow.calls.onDrag?.(event);
});

document.addEventListener("mouseup", () => {
  Glow.calls.endDrag?.();
});

window.addEventListener("resize", () => {
  const drag = Glow.state.calls?.drag;
  const overlay = Glow.els.callOverlay;
  if (!overlay || !drag) return;
  if (!Number.isFinite(drag.x) || !Number.isFinite(drag.y)) return;

  const maxX = Math.max(0, window.innerWidth - overlay.offsetWidth);
  const maxY = Math.max(0, window.innerHeight - overlay.offsetHeight);

  drag.x = Math.min(maxX, Math.max(0, drag.x));
  drag.y = Math.min(maxY, Math.max(0, drag.y));

  Glow.calls.applyPanelPosition();
  Glow.calls.savePanelPosition();
});

//window.addEventListener("resize", () => {
//  if (Glow.state.calls?.panelOpen) {
//    Glow.calls.applyPanelPosition?.();
//  }
//});
//
// Glow.calls.loadPanelPosition?.();

Glow.calls.ensureState();
Glow.calls.loadPanelPosition();

setInterval(() => {
  if (Glow.state.calls?.activeCall) {
    Glow.calls.updateSummaryMetrics?.();
  }
}, 1000);