/**
 * GMIIE Analyst Voice — server TTS (institutional voice synthesis) with browser fallback.
 * POST /api/tts with { text, voice_id?, language?, provider?, smart?, context? } → audio/mpeg
 */
(function (global) {
  const DEFAULT_VOICE = 'daniel';
  const DEFAULT_LANGUAGE = 'en';
  const VOICE_PERSONA = 'GMIIE Analyst Voice';
  let currentAudio = null;
  let currentBtn = null;
  let statusEl = null;

  function ensureStatusEl() {
    if (statusEl && document.body.contains(statusEl)) return statusEl;
    statusEl = document.getElementById('gmiie-voice-status');
    if (statusEl) return statusEl;
    statusEl = document.createElement('div');
    statusEl.id = 'gmiie-voice-status';
    statusEl.setAttribute('role', 'status');
    statusEl.setAttribute('aria-live', 'polite');
    statusEl.style.cssText =
      'position:fixed;bottom:64px;left:50%;transform:translateX(-50%);z-index:9997;max-width:min(420px,calc(100vw - 32px));padding:8px 14px;font-family:var(--mono,Consolas,monospace);font-size:10px;letter-spacing:.06em;text-transform:uppercase;background:rgba(26,26,26,.92);color:rgba(255,255,255,.88);border:1px solid rgba(184,149,58,.45);box-shadow:0 8px 24px rgba(0,0,0,.25);display:none;pointer-events:none;';
    document.body.appendChild(statusEl);
    return statusEl;
  }

  function showStatus(msg, ms) {
    const el = ensureStatusEl();
    el.textContent = msg;
    el.style.display = msg ? 'block' : 'none';
    if (ms) setTimeout(() => { if (el.textContent === msg) el.style.display = 'none'; }, ms);
  }

  function pickFallbackVoice(utterance) {
    const voices = global.speechSynthesis?.getVoices?.() || [];
    const pref =
      voices.find((v) => v.name === 'Daniel') ||
      voices.find((v) => v.name.includes('Google UK English Male')) ||
      voices.find((v) => v.lang === 'en-GB' && !v.name.toLowerCase().includes('female'));
    if (pref) utterance.voice = pref;
  }

  function resetBtn(btn) {
    if (!btn) return;
    btn.classList.remove('on', 'speaking', 'playing', 'loading');
    btn.removeAttribute('aria-busy');
    const orig = btn.getAttribute('data-orig');
    if (orig) btn.textContent = orig;
  }

  function setLoading(btn) {
    if (!btn) return;
    if (!btn.getAttribute('data-orig')) btn.setAttribute('data-orig', btn.textContent);
    btn.classList.add('loading');
    btn.setAttribute('aria-busy', 'true');
    btn.textContent = 'Loading voice…';
  }

  function stop() {
    if (currentAudio) {
      currentAudio.pause();
      currentAudio = null;
    }
    if (global.speechSynthesis?.speaking) global.speechSynthesis.cancel();
    if (currentBtn) resetBtn(currentBtn);
    currentBtn = null;
    showStatus('');
  }

  function playBlob(blob, btn, provider, onStatus) {
    const url = URL.createObjectURL(blob);
    const audio = new Audio();
    audio.preload = 'auto';
    currentAudio = audio;

    const cleanup = () => {
      URL.revokeObjectURL(url);
      currentAudio = null;
      resetBtn(btn);
      currentBtn = null;
      showStatus('');
    };

    audio.onended = cleanup;
    audio.onerror = cleanup;
    audio.src = url;

    return new Promise((resolve, reject) => {
      const onReady = () => {
        audio.removeEventListener('canplaythrough', onReady);
        audio.removeEventListener('error', onErr);
        audio
          .play()
          .then(() => {
            if (provider) showStatus(VOICE_PERSONA + ' · ' + provider, 4000);
            onStatus?.({ provider });
            resolve();
          })
          .catch(reject);
      };
      const onErr = () => {
        audio.removeEventListener('canplaythrough', onReady);
        audio.removeEventListener('error', onErr);
        cleanup();
        reject(new Error('Audio playback failed'));
      };
      audio.addEventListener('canplaythrough', onReady, { once: true });
      audio.addEventListener('error', onErr, { once: true });
      audio.load();
    });
  }

  async function speak(text, btn, opts) {
    opts = opts || {};
    if (!text) return;

    btn = btn || (typeof global.event !== 'undefined' ? global.event.currentTarget : null);

    if (
      (currentAudio && !currentAudio.paused && currentBtn === btn) ||
      (global.speechSynthesis?.speaking && currentBtn === btn)
    ) {
      stop();
      return;
    }

    stop();

    if (btn) {
      if (!btn.getAttribute('data-orig')) btn.setAttribute('data-orig', btn.textContent);
      btn.classList.add('on', 'speaking', 'playing');
      currentBtn = btn;
      setLoading(btn);
    }

    showStatus('Preparing ' + VOICE_PERSONA + '…');

    const payload = {
      text: String(text).slice(0, 15000),
      voice_id: opts.voice_id || DEFAULT_VOICE,
      language: opts.language || DEFAULT_LANGUAGE,
      provider: opts.provider || 'auto',
      smart: opts.smart !== false,
      context: opts.context && typeof opts.context === 'object' ? opts.context : {},
    };

    try {
      const r = await fetch(opts.endpoint || '/api/tts', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', Accept: 'audio/mpeg' },
        body: JSON.stringify(payload),
        signal: AbortSignal.timeout(opts.timeout || 30000),
      });

      const contentType = r.headers.get('content-type') || '';
      if (!r.ok || !contentType.includes('audio')) {
        const detail = contentType.includes('json') ? await r.text() : 'HTTP ' + r.status;
        throw new Error('TTS ' + r.status + ': ' + detail.slice(0, 120));
      }

      const provider = r.headers.get('X-TTS-Provider') || 'server';
      const blob = await r.blob();
      if (btn) {
        btn.classList.remove('loading');
        btn.textContent = btn.getAttribute('data-orig') || 'Listen';
        btn.classList.add('on', 'speaking', 'playing');
      }
      await playBlob(blob, btn, provider, opts.onStatus);
    } catch (_) {
      showStatus('Enhanced voice unavailable — using browser voice', 6000);
      if (btn) resetBtn(btn);
      if (btn) {
        btn.classList.add('on', 'speaking');
        currentBtn = btn;
      }

      const u = new SpeechSynthesisUtterance(String(text).slice(0, 5000));
      u.rate = opts.rate ?? 0.87;
      u.pitch = opts.pitch ?? 0.95;
      pickFallbackVoice(u);
      u.onend = () => {
        resetBtn(btn);
        currentBtn = null;
        showStatus('');
      };
      u.onerror = () => {
        resetBtn(btn);
        currentBtn = null;
        showStatus('');
      };
      global.speechSynthesis.speak(u);
    }
  }

  global.GrokVoice = {
    speak,
    stop,
    DEFAULT_VOICE,
    VOICE_PERSONA,
    showStatus,
  };
  if (global.speechSynthesis) {
    global.speechSynthesis.onvoiceschanged = () => {};
  }
})(typeof window !== 'undefined' ? window : globalThis);