const form = document.querySelector('#ticket-wizard');
const steps = [...document.querySelectorAll('[data-step]')];
const progress = [...document.querySelectorAll('[data-progress]')];
const unit = document.querySelector('#unit');
const category = document.querySelector('#category');
const subject = document.querySelector('#subject');
const body = document.querySelector('#body');
const province = document.querySelector('#province');
const city = document.querySelector('#city');
const files = [];
let current = 1;

const categories = {
  'فروش': ['مشاوره خرید', 'موجودی و قیمت', 'پیگیری سفارش'],
  'حسابداری': ['فیش واریزی', 'صورتحساب', 'پیگیری پرداخت'],
  'بارگیری انبار': ['هماهنگی بار', 'زمان ارسال', 'پیگیری تحویل'],
};
const cities = {
  'تهران': ['تهران', 'شهریار', 'اسلامشهر'],
  'اصفهان': ['اصفهان', 'کاشان', 'گلپایگان'],
  'مرکزی': ['اراک', 'ساوه', 'محلات'],
};

const recorderUi = {
  root: document.querySelector('#voice-recorder'), idle: document.querySelector('#voice-idle'),
  live: document.querySelector('#voice-live'), preview: document.querySelector('#voice-preview'),
  record: document.querySelector('#record'), pause: document.querySelector('#pause'),
  stop: document.querySelector('#stop'), cancel: document.querySelector('#cancel-recording'),
  rerecord: document.querySelector('#rerecord'), remove: document.querySelector('#delete-voice'),
  audio: document.querySelector('#audio'), reviewAudio: document.querySelector('#review-audio'),
  timer: document.querySelector('#voice-timer'), status: document.querySelector('#voice-status'),
  meta: document.querySelector('#voice-meta'), error: document.querySelector('#voice-error'),
};

let recorder = null;
let microphoneStream = null;
let audioChunks = [];
let voiceBlob = null;
let voiceUrl = '';
let recordingStartedAt = 0;
let pausedStartedAt = 0;
let totalPausedMs = 0;
let timerId = null;
let stopResolver = null;
let discardOnStop = false;

function toPersianDigits(value) {
  return String(value).replace(/\d/g, digit => '۰۱۲۳۴۵۶۷۸۹'[digit]);
}

function formatDuration(milliseconds) {
  const seconds = Math.max(0, Math.floor(milliseconds / 1000));
  return toPersianDigits(`${String(Math.floor(seconds / 60)).padStart(2, '0')}:${String(seconds % 60).padStart(2, '0')}`);
}

function elapsedRecordingTime() {
  if (!recordingStartedAt) return 0;
  const activePause = recorder?.state === 'paused' ? Date.now() - pausedStartedAt : 0;
  return Date.now() - recordingStartedAt - totalPausedMs - activePause;
}

function setSelect(select, items, placeholder) {
  select.replaceChildren(new Option(placeholder, ''), ...items.map(item => new Option(item, item)));
  select.disabled = !items.length;
}

function showStep(number) {
  current = number;
  steps.forEach(step => {
    const active = Number(step.dataset.step) === number;
    step.hidden = !active;
    step.classList.toggle('active', active);
  });
  progress.forEach(item => {
    const itemNumber = Number(item.dataset.progress);
    item.classList.toggle('active', itemNumber === number);
    item.classList.toggle('completed', itemNumber < number);
    item.querySelector('span').textContent = itemNumber < number ? '✓' : toPersianDigits(itemNumber);
  });
  window.scrollTo({ top: 0, behavior: 'smooth' });
}

function showValidationError(number, message, invalidFields = []) {
  const step = document.querySelector(`[data-step="${number}"]`);
  const error = document.querySelector(`[data-error="${number}"]`);
  step.querySelectorAll('[aria-invalid="true"]').forEach(field => field.removeAttribute('aria-invalid'));
  invalidFields.forEach(field => field?.setAttribute('aria-invalid', 'true'));
  error.textContent = message;
  error.tabIndex = -1;
  error.classList.add('visible');
  requestAnimationFrame(() => {
    error.focus({ preventScroll: true });
    error.scrollIntoView({ behavior: 'smooth', block: 'center', inline: 'nearest' });
  });
}

function clearValidationError(number) {
  const step = document.querySelector(`[data-step="${number}"]`);
  const error = document.querySelector(`[data-error="${number}"]`);
  step.querySelectorAll('[aria-invalid="true"]').forEach(field => field.removeAttribute('aria-invalid'));
  if (error) {
    error.textContent = '';
    error.classList.remove('visible');
    error.removeAttribute('tabindex');
  }
}

function validateStep(number) {
  const error = document.querySelector(`[data-error="${number}"]`);
  if (number === 1) {
    const missing = [];
    const invalidFields = [];
    if (!unit.value) { missing.push('واحد'); invalidFields.push(unit); }
    if (!category.value) { missing.push('دسته‌بندی'); invalidFields.push(category); }
    if (subject.value.trim().length < 5) { missing.push('موضوع حداقل پنج‌حرفی'); invalidFields.push(subject); }
    if (missing.length) {
      showValidationError(number, `برای ادامه، ${missing.join('، ')} را تکمیل کنید.`, invalidFields);
      return false;
    }
  }
  if (number === 4 && !body.value.trim() && !files.length && !voiceBlob) {
    showValidationError(number, 'برای ادامه، توضیح بنویسید یا یک فایل/پیام صوتی اضافه کنید.', [body]);
    return false;
  }
  if (error) clearValidationError(number);
  return true;
}

function stopMicrophoneTracks() {
  microphoneStream?.getTracks().forEach(track => track.stop());
  microphoneStream = null;
}

function clearTimer() { clearInterval(timerId); timerId = null; }

function updateRecorderView(mode, statusText) {
  recorderUi.idle.hidden = mode !== 'idle';
  recorderUi.live.hidden = mode !== 'live';
  recorderUi.preview.hidden = mode !== 'preview';
  recorderUi.root.dataset.state = mode;
  if (statusText) recorderUi.status.textContent = statusText;
}

function clearVoice() {
  clearTimer();
  stopMicrophoneTracks();
  if (voiceUrl) URL.revokeObjectURL(voiceUrl);
  voiceBlob = null;
  voiceUrl = '';
  recorderUi.audio.removeAttribute('src');
  recorderUi.reviewAudio.removeAttribute('src');
  recorderUi.reviewAudio.hidden = true;
  recorderUi.timer.textContent = '۰۰:۰۰';
  recorderUi.pause.textContent = 'مکث';
  recorderUi.error.hidden = true;
  updateRecorderView('idle', 'برای توضیح سریع‌تر، صدای خود را ضبط کنید.');
}

function completeRecording(blob, duration, automatic) {
  if (!blob.size) {
    clearVoice();
    recorderUi.error.textContent = 'صدایی ثبت نشد؛ لطفاً دوباره تلاش کنید.';
    recorderUi.error.hidden = false;
    return;
  }
  if (voiceUrl) URL.revokeObjectURL(voiceUrl);
  voiceBlob = blob;
  voiceUrl = URL.createObjectURL(blob);
  recorderUi.audio.src = voiceUrl;
  recorderUi.reviewAudio.src = voiceUrl;
  recorderUi.timer.textContent = formatDuration(duration);
  recorderUi.meta.textContent = `${formatDuration(duration)} · آماده پخش و ارسال`;
  updateRecorderView('preview', automatic ? 'ضبط هنگام ادامه‌دادن متوقف و ذخیره شد.' : 'ضبط با موفقیت ذخیره شد؛ آن را بررسی کنید.');
}

async function startRecording() {
  recorderUi.error.hidden = true;
  if (!window.isSecureContext || !navigator.mediaDevices?.getUserMedia || !window.MediaRecorder) {
    recorderUi.error.textContent = 'مرورگر یا اتصال فعلی امکان ضبط امن صدا را ندارد.';
    recorderUi.error.hidden = false;
    return;
  }
  try {
    if (voiceBlob) clearVoice();
    microphoneStream = await navigator.mediaDevices.getUserMedia({ audio: { echoCancellation: true, noiseSuppression: true, autoGainControl: true } });
    const mimeType = ['audio/webm;codecs=opus', 'audio/mp4', 'audio/ogg;codecs=opus', 'audio/webm']
      .find(type => MediaRecorder.isTypeSupported?.(type));
    recorder = new MediaRecorder(microphoneStream, mimeType ? { mimeType } : undefined);
    audioChunks = [];
    totalPausedMs = 0;
    discardOnStop = false;
    recorder.ondataavailable = event => { if (event.data.size) audioChunks.push(event.data); };
    recorder.onerror = () => {
      recorderUi.error.textContent = 'ضبط صدا متوقف شد. دوباره تلاش کنید.';
      recorderUi.error.hidden = false;
      clearVoice();
    };
    recorder.onstop = () => {
      const duration = elapsedRecordingTime();
      clearTimer();
      stopMicrophoneTracks();
      if (discardOnStop) clearVoice();
      else completeRecording(new Blob(audioChunks, { type: recorder.mimeType?.split(';')[0] || 'audio/webm' }), duration, recorderUi.root.dataset.autoStop === 'true');
      recorderUi.root.dataset.autoStop = 'false';
      recorder = null;
      stopResolver?.();
      stopResolver = null;
    };
    recorder.start(500);
    recordingStartedAt = Date.now();
    recorderUi.timer.textContent = '۰۰:۰۰';
    updateRecorderView('live', 'در حال ضبط؛ واضح و نزدیک به میکروفن صحبت کنید.');
    timerId = setInterval(() => { recorderUi.timer.textContent = formatDuration(elapsedRecordingTime()); }, 250);
  } catch (error) {
    stopMicrophoneTracks();
    recorderUi.error.textContent = error.name === 'NotAllowedError'
      ? 'دسترسی میکروفن رد شد؛ آن را از تنظیمات مرورگر فعال کنید.'
      : 'میکروفن در دسترس نیست یا برنامه دیگری از آن استفاده می‌کند.';
    recorderUi.error.hidden = false;
  }
}

function stopRecording({ discard = false, automatic = false } = {}) {
  if (!recorder || recorder.state === 'inactive') return Promise.resolve();
  discardOnStop = discard;
  recorderUi.root.dataset.autoStop = String(automatic);
  if (recorder.state === 'paused') {
    totalPausedMs += Date.now() - pausedStartedAt;
    recorder.resume();
  }
  return new Promise(resolve => { stopResolver = resolve; recorder.stop(); });
}

function togglePause() {
  if (!recorder) return;
  if (recorder.state === 'recording') {
    recorder.pause();
    pausedStartedAt = Date.now();
    recorderUi.pause.textContent = 'ادامه ضبط';
    recorderUi.status.textContent = 'ضبط موقتاً متوقف شده است.';
    recorderUi.root.dataset.state = 'paused';
  } else if (recorder.state === 'paused') {
    totalPausedMs += Date.now() - pausedStartedAt;
    recorder.resume();
    recorderUi.pause.textContent = 'مکث';
    recorderUi.status.textContent = 'در حال ضبط؛ واضح و نزدیک به میکروفن صحبت کنید.';
    recorderUi.root.dataset.state = 'live';
  }
}

function buildReview() {
  document.querySelector('#review-subject').textContent = subject.value;
  document.querySelector('#review-unit').textContent = unit.value;
  document.querySelector('#review-category').textContent = category.value;
  document.querySelector('#review-location').textContent = province.value ? [province.value, city.value].filter(Boolean).join('، ') : 'ثبت نشده';
  document.querySelector('#review-expert').textContent = document.querySelector('input[name="expert"]:checked').value;
  document.querySelector('#review-body').textContent = body.value.trim() || 'شرح متنی ثبت نشده است.';
  const list = document.querySelector('#review-files');
  list.replaceChildren();
  files.forEach(file => {
    const chip = document.createElement('span');
    chip.textContent = file.name;
    list.appendChild(chip);
  });
  if (!files.length && !voiceBlob) {
    const chip = document.createElement('span');
    chip.textContent = 'بدون پیوست';
    list.appendChild(chip);
  }
  recorderUi.reviewAudio.hidden = !voiceBlob;
}

document.querySelectorAll('[data-next]').forEach(button => button.addEventListener('click', async () => {
  button.disabled = true;
  if (current === 4 && recorder && recorder.state !== 'inactive') await stopRecording({ automatic: true });
  button.disabled = false;
  if (!validateStep(current)) return;
  if (current === 4) buildReview();
  showStep(Math.min(5, current + 1));
}));
document.querySelectorAll('[data-prev]').forEach(button => button.addEventListener('click', async () => {
  if (current === 4 && recorder && recorder.state !== 'inactive') await stopRecording({ automatic: true });
  showStep(Math.max(1, current - 1));
}));
document.querySelectorAll('[data-edit]').forEach(button => button.addEventListener('click', () => showStep(Number(button.dataset.edit))));
document.querySelector('#manual-toggle').addEventListener('click', event => {
  const target = document.querySelector('#manual-fields');
  target.hidden = !target.hidden;
  event.currentTarget.setAttribute('aria-expanded', String(!target.hidden));
  event.currentTarget.querySelector('span').textContent = target.hidden ? '⌄' : '⌃';
});
unit.addEventListener('change', () => setSelect(category, categories[unit.value] || [], 'انتخاب دسته‌بندی'));
province.addEventListener('change', () => setSelect(city, cities[province.value] || [], 'انتخاب شهر'));
document.querySelectorAll('[data-suggest-unit]').forEach(button => button.addEventListener('click', () => {
  unit.value = button.dataset.suggestUnit;
  setSelect(category, categories[unit.value] || [], 'انتخاب دسته‌بندی');
  category.value = button.dataset.suggestCategory;
  document.querySelector('#manual-fields').hidden = false;
  document.querySelector('#manual-toggle').setAttribute('aria-expanded', 'true');
  document.querySelectorAll('[data-suggest-unit]').forEach(item => item.classList.toggle('chosen', item === button));
}));
document.querySelector('#intent').addEventListener('input', event => {
  const query = event.target.value.trim();
  const suggestions = document.querySelector('#suggestions');
  const suggestionButtons = [...suggestions.querySelectorAll('[data-suggest-unit]')];
  suggestions.hidden = !query;
  if (!query) {
    suggestionButtons.forEach(button => { button.hidden = false; });
    document.querySelector('#suggestion-empty').hidden = true;
    return;
  }
  const normalizedQuery = query.toLocaleLowerCase('fa');
  let visibleCount = 0;
  suggestionButtons.forEach(button => {
    const matches = button.textContent.toLocaleLowerCase('fa').includes(normalizedQuery);
    button.hidden = !matches;
    if (matches) visibleCount += 1;
  });
  document.querySelector('#suggestion-empty').hidden = visibleCount > 0;
});
document.querySelectorAll('.expert input').forEach(input => input.addEventListener('change', () => {
  document.querySelectorAll('.expert').forEach(card => card.classList.toggle('selected', card.querySelector('input').checked));
}));
body.addEventListener('input', () => { document.querySelector('#body-count').textContent = toPersianDigits(body.value.length); });

function renderFiles() {
  const preview = document.querySelector('#file-preview');
  preview.replaceChildren();
  files.forEach((file, index) => {
    const card = document.createElement('div');
    card.className = 'file-card';
    if (file.type.startsWith('image/')) {
      const image = document.createElement('img');
      image.src = URL.createObjectURL(file);
      image.onload = () => URL.revokeObjectURL(image.src);
      image.alt = `پیش‌نمایش ${file.name}`;
      card.appendChild(image);
    } else {
      const icon = document.createElement('div');
      icon.className = 'file-icon';
      icon.textContent = (file.name.split('.').pop() || 'FILE').toUpperCase();
      card.appendChild(icon);
    }
    const label = document.createElement('small');
    label.textContent = file.name;
    card.appendChild(label);
    const remove = document.createElement('button');
    remove.type = 'button';
    remove.textContent = '×';
    remove.setAttribute('aria-label', `حذف ${file.name}`);
    remove.addEventListener('click', () => { files.splice(index, 1); renderFiles(); });
    card.appendChild(remove);
    preview.appendChild(card);
  });
}

document.querySelectorAll('#gallery,#documents').forEach(input => input.addEventListener('change', () => {
  files.push(...input.files);
  input.value = '';
  renderFiles();
}));
recorderUi.record.addEventListener('click', startRecording);
recorderUi.pause.addEventListener('click', togglePause);
recorderUi.stop.addEventListener('click', () => stopRecording());
recorderUi.cancel.addEventListener('click', () => stopRecording({ discard: true }));
recorderUi.remove.addEventListener('click', clearVoice);
recorderUi.rerecord.addEventListener('click', startRecording);
window.addEventListener('pagehide', () => { stopMicrophoneTracks(); clearTimer(); });
form.addEventListener('submit', event => {
  event.preventDefault();
  steps.forEach(step => { step.hidden = true; });
  document.querySelector('#success-page').hidden = false;
  progress.forEach(item => item.classList.add('completed'));
  window.scrollTo({ top: 0, behavior: 'smooth' });
});
document.querySelector('#restart').addEventListener('click', () => {
  document.querySelector('#success-page').hidden = true;
  showStep(1);
});