// Deterministic browser stub that drives dockerfiles/hermes-webui-atlas-voice.js
// through complete hands-free turns with no microphone, audio device or GPU.
//
// The script under test is an IIFE with no exported seams, so the only honest
// way to assert what reaches POST /api/tts is to run it against a fake DOM and
// fake clock and record the requests it actually makes. Usage:
//
//     node atlas_voice_language_probe.js <path-to-atlas-voice.js>
//
// It prints one JSON object describing every scenario to stdout.
'use strict';

const fs = require('fs');
const vm = require('vm');

const SCRIPT_PATH = process.argv[2];
if (!SCRIPT_PATH) {
  throw new Error('usage: atlas_voice_language_probe.js <atlas-voice.js>');
}
const SOURCE = fs.readFileSync(SCRIPT_PATH, 'utf8');

function flush() {
  // Four macrotask hops drain the promise chains the script builds around
  // fetch()/json()/blob()/play() without ever waiting on wall-clock time.
  return new Promise((resolve) => {
    let hops = 0;
    (function hop() {
      hops += 1;
      if (hops > 12) {
        resolve();
        return;
      }
      setImmediate(hop);
    })();
  });
}

function makeElement(id) {
  return {
    id,
    style: {},
    dataset: {},
    value: '',
    textContent: '',
    className: '',
    classList: {
      entries: new Set(),
      add(name) { this.entries.add(name); },
      remove(name) { this.entries.delete(name); },
      contains(name) { return this.entries.has(name); },
    },
    listeners: [],
    addEventListener(type, handler) { this.listeners.push({ type, handler }); },
    removeEventListener(type, handler) {
      this.listeners = this.listeners.filter((entry) => entry.handler !== handler);
    },
    click() {
      const event = { preventDefault() {}, stopImmediatePropagation() {} };
      this.listeners
        .filter((entry) => entry.type === 'click')
        .forEach((entry) => entry.handler(event));
    },
    querySelector() { return null; },
    insertBefore() {},
    appendChild() {},
  };
}

function makeHarness() {
  const clock = { now: 1000000 };
  const timeouts = [];
  const intervals = new Map();
  let timerId = 1;

  const ttsRequests = [];
  const transcribeCalls = [];
  const toasts = [];
  const sends = [];

  let capability = { ok: true, available: true, provider: 'local_command' };
  let transcribeResponse = { ok: true, transcript: 'hello', language: 'en' };
  let transcribeStatus = 200;
  let assistantRows = [];
  let loud = false;
  let recorder = null;

  const storage = new Map();
  const elements = {};
  ['btnVoiceMode', 'voiceModeBar', 'voiceModeIndicator', 'voiceModeLabel', 'msg']
    .forEach((id) => { elements[id] = makeElement(id); });

  function MediaRecorder() {
    this.state = 'recording';
    this.ondataavailable = null;
    this.onstop = null;
    recorder = this;
  }
  MediaRecorder.prototype.start = function start() { this.state = 'recording'; };
  MediaRecorder.prototype.stop = function stop() {
    if (this.state === 'inactive') return;
    this.state = 'inactive';
    if (this.onstop) this.onstop();
  };
  MediaRecorder.isTypeSupported = function isTypeSupported() { return true; };

  function AudioContext() {
    this.createAnalyser = () => ({
      fftSize: 2048,
      getByteTimeDomainData(samples) {
        for (let i = 0; i < samples.length; i += 1) {
          samples[i] = loud ? (i % 2 ? 200 : 56) : 128;
        }
      },
    });
    this.createBiquadFilter = () => ({
      type: '', frequency: { value: 0 }, Q: { value: 0 }, connect() {},
    });
    this.createMediaStreamSource = () => ({ connect() {} });
    this.close = () => {};
  }

  function AudioElement() {
    this.currentTime = 0;
    this.onended = null;
    this.onerror = null;
    this.pause = () => {};
    this.play = () => {
      setImmediate(() => { if (this.onended) this.onended(); });
      return Promise.resolve();
    };
  }

  async function fetchStub(url, init) {
    if (url === '/api/transcribe/capability') {
      return { ok: true, status: 200, json: async () => capability };
    }
    if (url === '/api/transcribe') {
      transcribeCalls.push({ body: init && init.body });
      return {
        ok: transcribeStatus < 400,
        status: transcribeStatus,
        json: async () => transcribeResponse,
      };
    }
    if (url === '/api/tts') {
      ttsRequests.push(JSON.parse(init.body));
      return {
        ok: true,
        status: 200,
        blob: async () => ({ synthetic: true }),
        json: async () => ({}),
      };
    }
    throw new Error(`unexpected fetch: ${url}`);
  }

  const context = {
    console,
    Uint8Array,
    Promise,
    Math,
    JSON,
    String,
    Number,
    Error,
    parseInt,
    isNaN,
    Set,
    Map,
    Array,
    Object,
    Date: { now: () => clock.now },
    Blob: function Blob(parts, options) { this.parts = parts; this.type = (options || {}).type || ''; },
    File: function File(parts, name, options) {
      this.parts = parts; this.name = name; this.type = (options || {}).type || '';
    },
    FormData: function FormData() { this.entries = []; this.append = (k, v) => this.entries.push([k, v]); },
    URL: { createObjectURL: () => 'blob:atlas-test', revokeObjectURL() {} },
    Audio: AudioElement,
    MediaRecorder,
    AudioContext,
    fetch: fetchStub,
    localStorage: {
      getItem: (key) => (storage.has(key) ? storage.get(key) : null),
      setItem: (key, value) => { storage.set(key, String(value)); },
      removeItem: (key) => { storage.delete(key); },
    },
    navigator: {
      mediaDevices: {
        getUserMedia: async () => ({ getTracks: () => [{ stop() {} }] }),
        getSupportedConstraints: () => ({}),
      },
    },
    document: {
      getElementById: (id) => elements[id] || null,
      querySelectorAll: () => assistantRows,
      createElement: () => ({ value: '', textContent: '' }),
    },
    S: { session: { session_id: 'session-1' }, busy: false },
    setTimeout: (fn, delay) => {
      const id = timerId; timerId += 1;
      timeouts.push({ id, fn, at: clock.now + (delay || 0) });
      return id;
    },
    clearTimeout: (id) => {
      const index = timeouts.findIndex((entry) => entry.id === id);
      if (index >= 0) timeouts.splice(index, 1);
    },
    setInterval: (fn, delay) => {
      const id = timerId; timerId += 1;
      intervals.set(id, { fn, delay: delay || 0 });
      return id;
    },
    clearInterval: (id) => { intervals.delete(id); },
  };
  context.window = context;
  context.showToast = (message) => { toasts.push(message); };
  context.send = () => { sends.push(elements.msg.value); };
  context.autoResize = () => {};

  vm.createContext(context);
  vm.runInContext(SOURCE, context, { filename: 'atlas-voice.js' });

  function runDueTimeouts() {
    const due = timeouts.filter((entry) => entry.at <= clock.now);
    due.forEach((entry) => {
      const index = timeouts.indexOf(entry);
      if (index >= 0) timeouts.splice(index, 1);
      entry.fn();
    });
  }

  function tick(ms) {
    clock.now += ms;
    Array.from(intervals.values()).forEach((entry) => entry.fn());
    runDueTimeouts();
  }

  return {
    context,
    elements,
    ttsRequests,
    transcribeCalls,
    toasts,
    sends,
    clock,
    recorder: () => recorder,
    setLoud: (value) => { loud = value; },
    setCapability: (value) => { capability = value; },
    setTranscribeResponse: (value, status) => {
      transcribeResponse = value;
      transcribeStatus = status === undefined ? 200 : status;
    },
    setAssistantReply: (text) => { assistantRows = [{ dataset: { rawText: text } }]; },
    setSession: (id) => { context.S.session = { session_id: id }; },
    advance: (ms) => { clock.now += ms; },
    tick,
    runDueTimeouts,
    flush,
  };
}

// Walk one capture window: pre-roll audio, three loud frames so the VAD latches
// speech, then silence past the hangover so MediaRecorder.stop() fires.
async function captureSpeech(harness) {
  const active = harness.recorder();
  if (!active) throw new Error('voice mode never created a recorder');
  active.ondataavailable({ data: { size: 512 } });
  harness.setLoud(true);
  for (let i = 0; i < 4; i += 1) harness.tick(100);
  active.ondataavailable({ data: { size: 512 } });
  harness.setLoud(false);
  harness.advance(2500);
  harness.tick(100);
  await harness.flush();
}

async function startVoiceMode(harness) {
  await harness.flush();
  harness.elements.btnVoiceMode.click();
  await harness.flush();
}

// One complete turn: speak, transcribe, let the app "answer", read it back.
async function runTurn(harness, { transcript, language, reply }) {
  const payload = { ok: true, transcript };
  if (language !== undefined) payload.language = language;
  harness.setTranscribeResponse(payload);
  await captureSpeech(harness);
  harness.setAssistantReply(reply || 'An answer.');
  harness.context.autoReadLastAssistant();
  await harness.flush();
}

async function restartListening(harness) {
  harness.advance(1000);
  harness.runDueTimeouts();
  await harness.flush();
}

const scenarios = {};

scenarios.english_turn_speaks_english = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: 'What is the weather?', language: 'en' });
  return { tts: harness.ttsRequests };
};

scenarios.russian_turn_speaks_russian = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: 'Как дела?', language: 'ru', reply: 'Всё хорошо.' });
  return { tts: harness.ttsRequests };
};

scenarios.spanish_turn_speaks_spanish = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: '¿Qué tal?', language: 'es', reply: 'Muy bien.' });
  return { tts: harness.ttsRequests };
};

scenarios.missing_language_falls_back = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: 'Hello there.' });
  return { tts: harness.ttsRequests };
};

scenarios.unsupported_language_falls_back = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: 'Bonjour tout le monde.', language: 'fr' });
  return { tts: harness.ttsRequests };
};

scenarios.hostile_language_values_are_dropped = async () => {
  const results = [];
  const hostile = [
    'ru; rm -rf /',
    '../../ru_RU-irina-medium',
    'ru',
    'RUSSIAN',
    { language: 'ru' },
    ['ru'],
    42,
    null,
    'r',
    'ru ru',
    'x'.repeat(4096),
  ];
  for (const language of hostile) {
    const harness = makeHarness();
    // eslint-disable-next-line no-await-in-loop
    await startVoiceMode(harness);
    // eslint-disable-next-line no-await-in-loop
    await runTurn(harness, { transcript: 'Say something.', language });
    results.push({ sent: String(language), tts: harness.ttsRequests });
  }
  return { results };
};

scenarios.voice_field_is_never_sent = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: 'Как дела?', language: 'ru' });
  return { tts: harness.ttsRequests };
};

scenarios.language_does_not_leak_into_later_turn = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  await runTurn(harness, { transcript: 'Как дела?', language: 'ru', reply: 'Всё хорошо.' });
  await restartListening(harness);
  await runTurn(harness, { transcript: 'And in English?', language: undefined });
  await restartListening(harness);
  await runTurn(harness, { transcript: '¿Y ahora?', language: 'es' });
  return { tts: harness.ttsRequests };
};

scenarios.empty_transcript_does_not_arm_a_language = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  harness.setTranscribeResponse({ ok: true, transcript: '   ', language: 'ru' });
  await captureSpeech(harness);
  const sendsAfterBlank = harness.sends.slice();
  // A reply landing while the blank turn winds down must not inherit a
  // language that transcript never earned.
  harness.setAssistantReply('A stray answer.');
  harness.context.autoReadLastAssistant();
  await harness.flush();
  await restartListening(harness);
  await runTurn(harness, { transcript: 'Hello.', language: undefined });
  return { sendsAfterBlank, tts: harness.ttsRequests, sends: harness.sends };
};

scenarios.session_change_discards_language = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  harness.setTranscribeResponse({ ok: true, transcript: 'Как дела?', language: 'ru' });
  await captureSpeech(harness);
  harness.setSession('session-2');
  harness.setAssistantReply('Reply that belongs to another chat.');
  harness.context.autoReadLastAssistant();
  await harness.flush();
  const afterSwitch = harness.ttsRequests.slice();
  await restartListening(harness);
  await runTurn(harness, { transcript: 'Hello again.', language: undefined });
  return { afterSwitch, tts: harness.ttsRequests };
};

scenarios.deactivation_discards_language = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  harness.setTranscribeResponse({ ok: true, transcript: 'Как дела?', language: 'ru' });
  await captureSpeech(harness);
  harness.elements.btnVoiceMode.click();
  await harness.flush();
  harness.setAssistantReply('Late reply after the user left voice mode.');
  harness.context.autoReadLastAssistant();
  await harness.flush();
  const afterDeactivate = harness.ttsRequests.slice();
  harness.elements.btnVoiceMode.click();
  await harness.flush();
  await runTurn(harness, { transcript: 'Fresh start.', language: undefined });
  return { afterDeactivate, tts: harness.ttsRequests };
};

scenarios.transcribe_error_speaks_nothing = async () => {
  const harness = makeHarness();
  await startVoiceMode(harness);
  harness.setTranscribeResponse({ error: 'Whisper is down' }, 503);
  await captureSpeech(harness);
  harness.setAssistantReply('Some earlier answer.');
  harness.context.autoReadLastAssistant();
  await harness.flush();
  return { tts: harness.ttsRequests, toasts: harness.toasts };
};

(async () => {
  const output = {};
  const names = Object.keys(scenarios);
  for (const name of names) {
    // eslint-disable-next-line no-await-in-loop
    output[name] = await scenarios[name]();
  }
  process.stdout.write(JSON.stringify(output, null, 1));
})().catch((error) => {
  process.stderr.write(String((error && error.stack) || error));
  process.exit(1);
});