'use strict';

const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const vm = require('node:vm');

class StyleDeclaration {
  constructor() {
    this.values = new Map();
    this.display = '';
  }
  setProperty(name, value) { this.values.set(name, String(value)); }
  removeProperty(name) { this.values.delete(name); }
  getPropertyValue(name) { return this.values.get(name) || ''; }
}

class Element {
  constructor(id) {
    this.id = id;
    this.className = '';
    this.textContent = '';
    this.value = '';
    this.dataset = {};
    this.style = new StyleDeclaration();
    this.attributes = new Map();
    this.listeners = new Map();
    this.children = [];
    this.firstChild = null;
  }
  get classList() {
    const element = this;
    return {
      add(name) {
        const names = new Set(element.className.split(/\s+/).filter(Boolean));
        names.add(name);
        element.className = [...names].join(' ');
      },
      remove(name) {
        element.className = element.className.split(/\s+/).filter(value => value && value !== name).join(' ');
      },
      contains(name) { return element.className.split(/\s+/).includes(name); },
    };
  }
  addEventListener(type, callback) { this.listeners.set(type, callback); }
  removeEventListener(type, callback) {
    if (this.listeners.get(type) === callback) this.listeners.delete(type);
  }
  setAttribute(name, value) { this.attributes.set(name, String(value)); }
  getAttribute(name) { return this.attributes.get(name) || null; }
  insertBefore(child) {
    this.children.unshift(child);
    this.firstChild = this.children[0];
  }
  querySelector(selector) {
    if (selector === 'option[value="atlas"]') {
      return this.children.find(child => child.value === 'atlas') || null;
    }
    return null;
  }
  click() {
    const callback = this.listeners.get('click');
    if (callback) callback({preventDefault() {}, stopImmediatePropagation() {}});
  }
}

function flush() {
  return new Promise(resolve => setImmediate(resolve));
}

async function boot(scriptPath, reduced) {
  const elements = new Map();
  for (const id of ['btnVoiceMode', 'voiceModeBar', 'voiceModeIndicator', 'voiceModeLabel', 'msg', 'settingsTtsEngine', 'voiceInstrumentStyles']) {
    elements.set(id, new Element(id));
  }
  const modeButton = elements.get('btnVoiceMode');
  const bar = elements.get('voiceModeBar');
  const indicator = elements.get('voiceModeIndicator');
  const label = elements.get('voiceModeLabel');
  const styleLink = elements.get('voiceInstrumentStyles');
  styleLink.setAttribute('href', 'static/atlas-voice.css?v=test');
  bar.style.display = 'none';

  let now = 1000;
  let nextTimer = 1;
  const intervals = new Map();
  const timeouts = new Map();
  const captures = [];
  const recorders = [];
  const analysers = [];
  const assistantRows = [];
  const toasts = [];
  const reducedMotion = {matches: reduced, addEventListener() {}, removeEventListener() {}};
  let rejectNextCapture = false;
  let transcriptResolve;
  let uploadedFile = null;
  let sent = 0;
  let lastAudio = null;

  class FakeDate extends Date {
    static now() { return now; }
  }
  class FakeAnalyser {
    constructor() { this.fftSize = 0; this.level = 0; }
    getByteTimeDomainData(samples) {
      const sample = 128 + Math.round(this.level * 128);
      samples.fill(sample);
    }
  }
  class FakeAudioContext {
    createAnalyser() {
      const analyser = new FakeAnalyser();
      analysers.push(analyser);
      return analyser;
    }
    createBiquadFilter() { return {type: '', frequency: {value: 0}, Q: {value: 0}, connect() {}}; }
    createMediaStreamSource() { return {connect() {}}; }
    close() { return Promise.resolve(); }
  }
  class FakeMediaRecorder {
    static isTypeSupported() { return true; }
    constructor(stream, options) {
      this.stream = stream;
      this.state = 'inactive';
      this.mimeType = options?.mimeType || 'audio/webm;codecs=opus';
      this.ondataavailable = null;
      this.onstop = null;
      recorders.push(this);
    }
    start() { this.state = 'recording'; }
    stop() {
      if (this.state === 'inactive') return;
      this.state = 'inactive';
      if (this.onstop) queueMicrotask(() => this.onstop());
    }
  }
  class FakeAudio {
    constructor() {
      this.currentTime = 0;
      this.onended = null;
      this.onerror = null;
      this.paused = false;
      lastAudio = this;
    }
    play() { this.paused = false; return Promise.resolve(); }
    pause() { this.paused = true; }
    finish() { if (this.onended) this.onended(); }
  }

  const document = {
    getElementById(id) { return elements.get(id) || null; },
    createElement() { return new Element('created'); },
    querySelectorAll(selector) {
      assert.equal(selector, '.msg-row[data-role="assistant"], .assistant-segment[data-raw-text]');
      return assistantRows;
    },
  };
  const localValues = new Map();
  const localStorage = {
    getItem(key) { return localValues.has(key) ? localValues.get(key) : null; },
    setItem(key, value) { localValues.set(key, String(value)); },
  };
  const stream = {getTracks() { return [{stop() {}}]; }};
  const navigator = {
    mediaDevices: {
      getSupportedConstraints() { return {}; },
      async getUserMedia() {
        if (rejectNextCapture) {
          rejectNextCapture = false;
          throw new Error('Microphone unavailable');
        }
        captures.push(stream);
        return stream;
      },
    },
  };
  async function fetch(url, options) {
    if (url === '/api/transcribe/capability') {
      return {ok: true, json: async () => ({available: true, provider: 'local_command'})};
    }
    if (url === '/api/transcribe') {
      const file = options?.body?.get('file');
      assert.ok(file, 'transcription request did not carry a file');
      uploadedFile = {
        bytes: new Uint8Array(await file.arrayBuffer()),
        name: file.name,
        type: file.type,
      };
      return new Promise(resolve => { transcriptResolve = resolve; });
    }
    if (url === '/api/tts') {
      return {ok: true, blob: async () => new Blob(['wave'], {type: 'audio/wav'})};
    }
    throw new Error(`unexpected fetch: ${url}`);
  }
  const window = {
    MediaRecorder: FakeMediaRecorder,
    AudioContext: FakeAudioContext,
    setInterval(callback) {
      const id = nextTimer++;
      intervals.set(id, callback);
      return id;
    },
    clearInterval(id) { intervals.delete(id); },
    setTimeout(callback, delay) {
      const id = nextTimer++;
      timeouts.set(id, {callback, delay});
      return id;
    },
    clearTimeout(id) { timeouts.delete(id); },
    matchMedia(query) {
      assert.equal(query, '(prefers-reduced-motion: reduce)');
      return reducedMotion;
    },
    showToast(message) { toasts.push(message); },
    autoResize() {},
    send() { sent += 1; },
    stopTTS() {},
    _splitForTTS(text) { return [text]; },
    _stripForTTS(text) { return text; },
    URL: {createObjectURL() { return 'blob:voice'; }, revokeObjectURL() {}},
  };
  const context = {
    Audio: FakeAudio,
    Blob,
    Date: FakeDate,
    File,
    FormData,
    MediaRecorder: FakeMediaRecorder,
    URL: window.URL,
    Uint8Array,
    clearInterval: window.clearInterval,
    console,
    document,
    fetch,
    localStorage,
    navigator,
    queueMicrotask,
    S: {busy: false, session: {session_id: 'session-1'}},
    window,
  };
  window.window = window;
  window.document = document;
  window.fetch = fetch;
  window.localStorage = localStorage;
  window.navigator = navigator;
  Object.assign(window, {Blob, Date: FakeDate, File, FormData, URL: window.URL, Uint8Array});

  vm.runInNewContext(fs.readFileSync(scriptPath, 'utf8'), context, {filename: scriptPath});
  await flush();
  await flush();

  return {
    elements, modeButton, bar, indicator, label, styleLink, intervals, timeouts, window,
    captures, recorders, analysers, assistantRows, toasts, reducedMotion,
    get sent() { return sent; },
    get lastAudio() { return lastAudio; },
    get uploadedFile() { return uploadedFile; },
    set now(value) { now = value; },
    rejectCapture() { rejectNextCapture = true; },
    resolveTranscript(payload) {
      assert.ok(transcriptResolve, 'transcription request was not started');
      transcriptResolve({ok: true, json: async () => payload});
    },
    runIntervals() { for (const callback of [...intervals.values()]) callback(); },
    runTimeout(delay) {
      const match = [...timeouts].find(([, timer]) => timer.delay === delay);
      assert.ok(match, `timer ${delay}ms was not scheduled`);
      timeouts.delete(match[0]);
      match[1].callback();
    },
  };
}

async function normalMotionContract(scriptPath, mediaFixture) {
  const probe = await boot(scriptPath, false);
  const originalStyleLink = probe.styleLink;

  probe.modeButton.click();
  assert.match(probe.indicator.className, /\blistening\b/);
  assert.equal(probe.label.textContent, 'Listening');
  assert.equal(probe.bar.style.display, '');
  await flush();
  assert.equal(probe.captures.length, 1);

  const mediaChunks = mediaFixture.chunks;
  const preSpeechCount = mediaFixture.pre_speech_chunk_count;
  for (const chunk of mediaChunks.slice(0, preSpeechCount)) {
    probe.recorders[0].ondataavailable({
      data: new Blob([chunk], {type: mediaFixture.mime_type}),
    });
  }

  probe.analysers[0].level = 0.3;
  probe.runIntervals();
  probe.runIntervals();
  probe.runIntervals();
  for (const chunk of mediaChunks.slice(preSpeechCount)) {
    probe.recorders[0].ondataavailable({
      data: new Blob([chunk], {type: mediaFixture.mime_type}),
    });
  }
  probe.now = 4000;
  probe.analysers[0].level = 0;
  probe.runIntervals();
  await flush();
  await flush();
  assert.match(probe.indicator.className, /\btranscribing\b/);
  assert.equal(probe.label.textContent, 'Transcribing…');
  assert.ok(probe.uploadedFile, 'transcription upload was not captured');
  assert.equal(probe.uploadedFile.name, 'voice-input.webm');
  assert.equal(probe.uploadedFile.type, mediaFixture.mime_type);
  const expectedUpload = Buffer.concat(mediaChunks);
  assert.deepEqual(Buffer.from(probe.uploadedFile.bytes), expectedUpload);

  probe.resolveTranscript({transcript: 'Hello Hermes'});
  await flush();
  await flush();
  assert.match(probe.indicator.className, /\bthinking\b/);
  assert.equal(probe.label.textContent, 'Thinking…');
  assert.equal(probe.sent, 1);

  probe.assistantRows.push({dataset: {rawText: 'A calm answer.'}});
  const capturesBeforeSpeech = probe.captures.length;
  probe.window.autoReadLastAssistant();
  assert.match(probe.indicator.className, /\bspeaking\b/);
  assert.equal(probe.label.textContent, 'Speaking');
  assert.equal(probe.captures.length, capturesBeforeSpeech);
  await flush();
  await flush();
  assert.match(probe.indicator.className, /\bis-playing\b/);
  assert.equal(probe.captures.length, capturesBeforeSpeech);
  probe.lastAudio.finish();
  await flush();
  assert.doesNotMatch(probe.indicator.className, /\bis-playing\b/);

  return {probe, originalStyleLink, capturesBeforeSpeech};
}

async function main() {
  const scriptPath = process.argv[2];
  const fixturePath = process.argv[3];
  assert.ok(
    scriptPath && fixturePath,
    'usage: node hermes_voice_instrument_probe.js <atlas-voice.js> <media-fixture.json>',
  );
  const mediaFixture = JSON.parse(fs.readFileSync(fixturePath, 'utf8'));
  const payload = fs.readFileSync(path.join(path.dirname(fixturePath), mediaFixture.payload_file));
  let offset = 0;
  mediaFixture.chunks = mediaFixture.chunk_sizes.map(size => {
    const chunk = payload.subarray(offset, offset + size);
    offset += size;
    return chunk;
  });
  assert.equal(offset, payload.length, 'fixture chunk sizes do not cover the payload');
  const first = await normalMotionContract(scriptPath, mediaFixture);
  const {probe, originalStyleLink, capturesBeforeSpeech} = first;

  assert.equal(probe.captures.length, capturesBeforeSpeech);
  assert.strictEqual(probe.elements.get('voiceInstrumentStyles'), originalStyleLink);

  probe.modeButton.click();
  assert.equal(probe.bar.style.display, 'none');
  assert.match(probe.indicator.className, /\bidle\b/);
  probe.modeButton.click();
  await flush();
  probe.modeButton.click();
  assert.equal(probe.bar.style.display, 'none');
  assert.strictEqual(probe.elements.get('voiceInstrumentStyles'), originalStyleLink);

  const reduced = await boot(scriptPath, true);
  reduced.modeButton.click();
  await flush();
  const initialScale = reduced.indicator.style.getPropertyValue('--voice-ripple-scale');
  reduced.analysers[0].level = 0.5;
  reduced.runIntervals();
  assert.equal(reduced.indicator.style.getPropertyValue('--voice-ripple-scale'), initialScale);
  reduced.modeButton.click();

  const unavailable = await boot(scriptPath, false);
  unavailable.rejectCapture();
  unavailable.modeButton.click();
  await flush();
  await flush();
  assert.match(unavailable.indicator.className, /\berror\b/);
  assert.equal(unavailable.label.textContent, 'Microphone unavailable');
  assert.equal(unavailable.bar.style.display, '');
  unavailable.runTimeout(3200);
  assert.equal(unavailable.bar.style.display, 'none');
  assert.match(unavailable.indicator.className, /\bidle\b/);

  process.stdout.write('voice instrument DOM contract passed\n');
}

main().catch(error => {
  console.error(error.stack || error);
  process.exitCode = 1;
});