const IFACE = 'io.qvac.Jarvis.Session';
const OBJECT = '/io/qvac/Jarvis';
const BUS_NAME = 'io.qvac.Jarvis';

export async function serveOnSessionBus(daemon) {
  // dbus-next is CommonJS. Load it through Bare's Node compatibility map so
  // its builtin imports use bare-* implementations where supported.
  const { createRequire } = await import('node:module');
  const require = createRequire(import.meta.url);
  // dbus-next enables TCP_NODELAY on every transport. Bare's Unix-pipe
  // transport exposes the Node-compatible method on the wrapper, but its
  // underlying pipe does not implement the native socket operation. D-Bus is
  // request/response traffic, so disabling this optional optimization keeps
  // the transport functional without changing message semantics.
  const net = require('node:net', { with: { imports: 'bare-node-runtime/imports' } });
  if (net.Socket?.prototype) net.Socket.prototype.setNoDelay = function setNoDelay() { return this; };
  const dbus = require('dbus-next', { with: { imports: 'bare-node-runtime/imports' } });
  const { Interface } = dbus.interface;
  class Session extends Interface {
    constructor() { super(IFACE); }
    Arm() { daemon.arm(); }
    Sleep() { daemon.sleep(); }
    Shutdown() { daemon.close(); }
    PushToTalk(pressed) { daemon.setPushToTalk?.(Boolean(pressed)); }
    Say(text) { return daemon.say?.(text); }
    Ask(text) { return daemon.ask(text); }
    Cancel() { daemon.cancel(); }
    SetMode(mode) { daemon.mode = mode; daemon.emit('ModeChanged', mode); }
    GetState() { return daemon.state; }
    EnrollWake(phrase) { daemon.emit('EnrollWake', String(phrase)); }
    IngestPath(filePath) { daemon.emit('IngestPath', String(filePath)); }
    ComputerGrant(persist) { daemon.computerGrant(persist); }
    ComputerRevoke() { daemon.computerRevoke(); }
    ComputerStatus() { return JSON.stringify(daemon.computer.status()); }
    GetRuntimeStatus() { return daemon.runtimeStatus(); }
    AssessModelFit(model) { return daemon.assessModelFit(model); }
    DownloadModel(model) { return daemon.downloadModel(model); }
    CancelModel(model) { return daemon.cancelModel(model); }
    WipeComputerTraces() { return daemon.wipeComputerTraces(); }
    ConfirmationRequired(tool, args, pattern) { this.emit('ConfirmationRequired', String(tool), String(args), String(pattern)); }
    StateChanged(state) { this.emit('StateChanged', state); }
    Reply(text) { this.emit('Reply', String(text)); }
    Token(text) { this.emit('Token', String(text)); }
    Error(code, message) { this.emit('Error', String(code), String(message)); }
    WakeHeard(phrase) { this.emit('WakeHeard', String(phrase)); }
    PartialTranscript(text) { this.emit('PartialTranscript', String(text)); }
    FinalTranscript(text) { this.emit('FinalTranscript', String(text)); }
    SpeakingLevel(rms) { this.emit('SpeakingLevel', Number(rms)); }
    ListeningLevel(rms) { this.emit('ListeningLevel', Number(rms)); }
    ChipOffered(id, label, payload) { this.emit('ChipOffered', String(id), String(label), String(payload)); }
    JobProgress(id, pct, label) { this.emit('JobProgress', String(id), Number(pct), String(label)); }
    ComputerStep(json) { this.emit('ComputerStep', String(json)); }
    ComputerHighlight(json) { this.emit('ComputerHighlight', String(json)); }
  }
  Session.configureMembers({
    methods: {
      Arm: { inSignature: '', outSignature: '' },
    Sleep: { inSignature: '', outSignature: '', method: 'Sleep' },
    Shutdown: { inSignature: '', outSignature: '', method: 'Shutdown' },
    PushToTalk: { inSignature: 'b', outSignature: '', method: 'PushToTalk' },
    Say: { inSignature: 's', outSignature: '', method: 'Say' },
    Ask: { inSignature: 's', outSignature: '', method: 'Ask' },
    Cancel: { inSignature: '', outSignature: '', method: 'Cancel' },
    SetMode: { inSignature: 's', outSignature: '', method: 'SetMode' },
    GetState: { inSignature: '', outSignature: 's', method: 'GetState' },
    EnrollWake: { inSignature: 's', outSignature: '', method: 'EnrollWake' },
    IngestPath: { inSignature: 's', outSignature: '', method: 'IngestPath' },
    ComputerGrant: { inSignature: 'b', outSignature: '', method: 'ComputerGrant' },
    ComputerRevoke: { inSignature: '', outSignature: '', method: 'ComputerRevoke' },
    ComputerStatus: { inSignature: '', outSignature: 's', method: 'ComputerStatus' },
    GetRuntimeStatus: { inSignature: '', outSignature: 's', method: 'GetRuntimeStatus' },
    AssessModelFit: { inSignature: 's', outSignature: 's', method: 'AssessModelFit' },
    DownloadModel: { inSignature: 's', outSignature: 's', method: 'DownloadModel' },
    CancelModel: { inSignature: 's', outSignature: 's', method: 'CancelModel' },
    WipeComputerTraces: { inSignature: '', outSignature: 'b' },
    },
    signals: {
    StateChanged: { signature: 's', signal: true },
    Reply: { signature: 's', signal: true },
    Token: { signature: 's', signal: true },
    Error: { signature: 'ss', signal: true },
    WakeHeard: { signature: 's', signal: true },
    PartialTranscript: { signature: 's', signal: true },
    FinalTranscript: { signature: 's', signal: true },
    SpeakingLevel: { signature: 'd', signal: true },
    ListeningLevel: { signature: 'd', signal: true },
    ChipOffered: { signature: 'sss', signal: true },
    JobProgress: { signature: 'sds', signal: true },
    ComputerStep: { signature: 's', signal: true },
    ComputerHighlight: { signature: 's', signal: true },
    ConfirmationRequired: { signature: 'sss', signal: true },
    },
  });
  const bus = dbus.sessionBus();
  // Bare streams emit `data` but do not keep a Node-style readable buffer.
  // dbus-next's authentication and message parser use read()/readable, so
  // provide that small compatibility layer for this one D-Bus connection.
  const stream = bus._connection?.stream;
  if (globalThis.Bare && stream && !stream.__jarvisReadableBuffer) {
    let pending = Buffer.alloc(0);
    let readableScheduled = false;
    stream.__jarvisReadableBuffer = true;
    stream.on('data', (chunk) => {
      pending = Buffer.concat([pending, Buffer.from(chunk)]);
      if (!readableScheduled) {
        readableScheduled = true;
        setTimeout(() => {
          readableScheduled = false;
          stream.emit('readable');
        }, 0);
      }
    });
    stream.read = (size) => {
      if (pending.length === 0) return null;
      if (size == null || size >= pending.length) {
        const result = pending;
        pending = Buffer.alloc(0);
        return result;
      }
      const result = pending.subarray(0, size);
      pending = pending.subarray(size);
      return result;
    };
  }
  await bus.requestName(BUS_NAME);
  const iface = new Session();
  bus.export(OBJECT, iface);
  daemon.on('StateChanged', (state) => iface.StateChanged(state));
  daemon.on('Reply', (reply) => iface.Reply(reply));
  daemon.on('Token', (token) => iface.Token(token));
  daemon.on('Error', (code, message) => iface.Error(code, message));
  daemon.on('ConfirmationRequired', (event) => iface.ConfirmationRequired(event?.tool || 'action', JSON.stringify(event?.args || {}), event?.pattern || 'explicit confirmation required'));
  for (const signal of ['WakeHeard', 'PartialTranscript', 'FinalTranscript', 'SpeakingLevel', 'ListeningLevel', 'ChipOffered', 'JobProgress', 'ComputerStep', 'ComputerHighlight']) {
    daemon.on(signal, (...args) => iface[signal](...args));
  }
  return bus;
}

export { BUS_NAME, OBJECT, IFACE };