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

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.peers ||= [];
  state.reconnectTimer ||= null;
  state.invites ||= [];
  state.invitePollTimer ||= null;
};

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) return false;
  ws.send(JSON.stringify(payload));
  return true;
};

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

Glow.calls.setRemoteAudioFromAnyPeer = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  const firstStream = [...state.remoteStreams.values()][0] || null;
  if (Glow.els.remoteAudio) {
    Glow.els.remoteAudio.srcObject = firstStream;
  }
};

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
  };

  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.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);
  Glow.calls.setRemoteAudioFromAnyPeer();
};

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.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;

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

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

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

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

  pc.onicecandidate = event => {
    if (!event.candidate) return;
    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;
    state.remoteStreams.set(peerId, stream);
    Glow.calls.setRemoteAudioFromAnyPeer();
  };

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

  state.peerConnections.set(peerId, pc);

  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 => {
  const pc = await Glow.calls.ensurePeerConnection(peerId);
  const offer = await pc.createOffer();
  await pc.setLocalDescription(offer);
  Glow.calls.sendSignal({
    type: "offer",
    to: peerId,
    sdp: offer.sdp
  });
};

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 (_) {}
  }
};

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

  const helperResp = await fetch(`${data.calls_base}/api/call/session`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ token: data.token })
  });

  let helperData = {};
  try {
    helperData = await helperResp.json();
  } catch (_) {}

  if (!helperResp.ok || !helperData.ok) {
    throw new Error(helperData.error || `Call helper failed (${helperResp.status})`);
  }

  helperData.calls_base = data.calls_base;
  helperData.group_session = data.session;
  return helperData;
};

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

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

  return new Promise((resolve, reject) => {
    const ws = new WebSocket(Glow.calls.replaceHttpWs(state.session.ws_url));
    state.ws = ws;

    ws.onopen = () => {
      resolve();
    };

    ws.onerror = error => {
      reject(error);
    };

    ws.onclose = () => {
      if (state.activeCall) {
        Glow.calls.scheduleReconnect();
      }
    };

    ws.onmessage = async event => {
      let signal;
      try {
        signal = JSON.parse(event.data);
      } catch (_) {
        return;
      }

      if (signal.type === "joined") {
        state.selfPeerId = signal.participantId;
        Glow.renderCallUi();
        return;
      }

      if (signal.type === "participant-joined") {
        Glow.calls.upsertPeer({
          participantId: signal.participantId,
          roomId: signal.roomId
        });
        Glow.renderCallUi();

        if (signal.participantId && signal.participantId !== state.selfPeerId) {
          try {
            await Glow.calls.makeOfferTo(signal.participantId);
          } catch (_) {}
        }
        return;
      }

      if (signal.type === "participant-left") {
        Glow.calls.removePeer(signal.participantId);
        Glow.renderCallUi();
        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 (_) {}
        }
        return;
      }

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

        const pc = await Glow.calls.ensurePeerConnection(from);
        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: answer.sdp
        });
        return;
      }

      if (signal.type === "answer") {
        const from = signal.from;
        if (!from) return;
        const pc = await Glow.calls.ensurePeerConnection(from);
        await pc.setRemoteDescription({ type: "answer", sdp: signal.sdp });
        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 (_) {}
      }
    };
  });
};

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.close();
    } catch (_) {}
  }

  state.ws = null;
  state.peerConnections = new Map();
  state.remoteStreams = new Map();
  state.peers = [];
  state.selfPeerId = null;
  state.reconnectTimer = null;
};

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

  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;
};

Glow.endLocalCallUi = async () => {
  Glow.calls.resetAll();
  if (Glow.els.remoteAudio) {
    Glow.els.remoteAudio.srcObject = null;
  }
  Glow.renderCallUi();
};

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

  clearTimeout(state.reconnectTimer);
  state.reconnectTimer = setTimeout(async () => {
    try {
      if (!state.activeCall) return;
      const scope = state.activeCall.scope;
      if (!scope) return;

      Glow.calls.resetTransportOnly();
      state.session = await Glow.calls.fetchGroupCallSession(scope);
      await Glow.calls.connectWebSocket();
      Glow.showToast("Call reconnected.");
      Glow.renderCallUi();
    } catch (_) {
      Glow.calls.scheduleReconnect();
    }
  }, 2000);
};

Glow.renderCallUi = () => {
  Glow.calls.ensureState();
  const state = Glow.calls.state();
  const active = Boolean(state.activeCall);
  const scope = state.activeCall?.scope || Glow.calls.getCurrentScope();
  const peerCount = Glow.calls.listOtherPeers().length;

  if (!Glow.els.callStatus) return;

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

  Glow.els.callStatus.textContent = active
    ? peerCount > 0
      ? `Group call active · ${peerCount} peer(s)`
      : "Call open"
    : "Idle";

  Glow.els.startCallButton?.classList.toggle("hidden", !Glow.calls.isGroupCallContext());
  Glow.els.answerCallButton?.classList.add("hidden");
  Glow.els.muteCallButton?.classList.toggle("hidden", !active);
  Glow.els.hangupCallButton?.classList.toggle("hidden", !active);
  if (Glow.els.addToCallButton) {
    Glow.els.addToCallButton.classList.toggle("hidden", !active);
  }

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

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

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;
  }

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

  try {
    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.selfPeerId = session.peer_id;
    Glow.state.calls.peers = [];
    Glow.state.calls.peerConnections = new Map();
    Glow.state.calls.remoteStreams = new Map();

    Glow.openCallPanel();
    await Glow.calls.ensureLocalAudio();
    await Glow.calls.connectWebSocket();
    Glow.renderCallUi();
    Glow.showToast("Group call ready.");
  } catch (error) {
    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.renderCallUi();
};

Glow.hangupCall = async () => {
  try {
    Glow.calls.sendSignal({ type: "hangup" });
  } catch (_) {}
  Glow.showToast("Call ended.");
  await Glow.endLocalCallUi();
};

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.apiRequest("/api/group-calls/invite", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      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.showToast(error.message || "Could not send invite.", "error");
  }
};

Glow.calls.fetchInvites = async () => {
  Glow.calls.ensureState();
  if (!Glow.state.currentUser) return [];
  const data = await Glow.apiRequest("/api/group-calls/invites");
  Glow.state.calls.invites = data.invites || [];
  return Glow.state.calls.invites;
};

Glow.calls.acceptInvite = async inviteId => {
  const data = await Glow.apiRequest(`/api/group-calls/invites/${encodeURIComponent(inviteId)}/accept`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({})
  });

  const helperResp = await fetch(`${data.calls_base}/api/call/session`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ token: data.token })
  });

  let helperData = {};
  try {
    helperData = await helperResp.json();
  } catch (_) {}

  if (!helperResp.ok || !helperData.ok) {
    throw new Error(helperData.error || `Call helper failed (${helperResp.status})`);
  }

  helperData.calls_base = data.calls_base;
  helperData.group_session = {
    helper_call_id: data.call_id
  };
  return helperData;
};

Glow.calls.dismissInvite = async inviteId => {
  await Glow.apiRequest(`/api/group-calls/invites/${encodeURIComponent(inviteId)}/dismiss`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({})
  });
};

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 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.selfPeerId = session.peer_id;
    Glow.state.calls.peers = [];
    Glow.state.calls.peerConnections = new Map();
    Glow.state.calls.remoteStreams = new Map();

    Glow.openCallPanel();
    await Glow.calls.ensureLocalAudio();
    await Glow.calls.connectWebSocket();
    Glow.renderCallUi();
    Glow.showToast("Joined group call.");
  } catch (error) {
    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 (_) {}
};

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.syncActiveCallForDm = async () => {
  Glow.renderCallUi();
};

Glow.pollCallSignals = async () => {
};

Glow.scheduleCallPolling = () => {
};

Glow.answerIncomingCall = async () => {
};

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

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

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

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

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