// ─── Config ────────────────────────────────────────────────────────────────

let TTS_CONFIG = null;

async function loadTtsConfig() {
  try {
    const r = await fetch('/tts/config');
    TTS_CONFIG = await r.json();
  } catch (e) {
    TTS_CONFIG = {
      default_backend: 'xtts',
      default_language: 'ko',
      backends: { xtts: { languages: ['ko', 'en'] } },
    };
  }
  populateTtsBackends();
}

const ttsBackendSel = document.getElementById('tts-backend');
const ttsLanguageSel = document.getElementById('tts-language');
const ttsVoiceSel = document.getElementById('tts-voice-select');

function populateTtsBackends() {
  if (!TTS_CONFIG) return;
  ttsBackendSel.innerHTML = '';
  for (const name of Object.keys(TTS_CONFIG.backends)) {
    const opt = document.createElement('option');
    opt.value = name;
    opt.textContent = name;
    if (name === TTS_CONFIG.default_backend) opt.selected = true;
    ttsBackendSel.appendChild(opt);
  }
  if (!ttsBackendSel.value && ttsBackendSel.options.length) {
    ttsBackendSel.selectedIndex = 0;
  }
  populateTtsLanguages();
}

function populateTtsLanguages() {
  if (!TTS_CONFIG) return;
  const backend = TTS_CONFIG.backends[ttsBackendSel.value];
  const languages = backend?.languages || [];
  ttsLanguageSel.innerHTML = '';
  for (const lang of languages) {
    const opt = document.createElement('option');
    opt.value = lang;
    opt.textContent = lang;
    if (lang === TTS_CONFIG.default_language) opt.selected = true;
    ttsLanguageSel.appendChild(opt);
  }
  if (!ttsLanguageSel.value && languages.length) ttsLanguageSel.value = languages[0];
}

ttsBackendSel.addEventListener('change', populateTtsLanguages);

// ─── Voices ────────────────────────────────────────────────────────────────

const ttsVoiceList = document.getElementById('tts-voice-list');

async function loadTtsVoices() {
  let voices = [];
  try {
    const r = await fetch('/tts/voices');
    voices = await r.json();
  } catch (e) {
    ttsVoiceList.innerHTML = `<div class="muted small">불러오기 실패: ${esc(e.message)}</div>`;
    return;
  }
  renderTtsVoiceList(voices);
  renderTtsVoiceSelect(voices);
}

function renderTtsVoiceList(voices) {
  if (!voices.length) {
    ttsVoiceList.innerHTML = '<div class="muted small">등록된 보이스가 없습니다. 먼저 참조 음성을 업로드하세요.</div>';
    return;
  }
  ttsVoiceList.innerHTML = '';
  for (const v of voices) {
    const row = document.createElement('div');
    row.className = 'voice-row';
    row.innerHTML = `
      <span class="voice-name">${esc(v.name)}</span>
      <audio controls src="/tts/voices/${encodeURIComponent(v.name)}/audio"></audio>
      <button type="button" class="btn-danger voice-delete-btn" data-name="${esc(v.name)}">삭제</button>
    `;
    ttsVoiceList.appendChild(row);
  }
  ttsVoiceList.querySelectorAll('.voice-delete-btn').forEach(btn => {
    btn.addEventListener('click', () => deleteTtsVoice(btn.dataset.name));
  });
}

function renderTtsVoiceSelect(voices) {
  const prev = ttsVoiceSel.value;
  ttsVoiceSel.innerHTML = '';
  for (const v of voices) {
    const opt = document.createElement('option');
    opt.value = v.name;
    opt.textContent = v.name;
    ttsVoiceSel.appendChild(opt);
  }
  if (voices.some(v => v.name === prev)) ttsVoiceSel.value = prev;
}

async function deleteTtsVoice(name) {
  if (!confirm(`보이스 '${name}'을 삭제하시겠습니까?`)) return;
  try {
    const r = await fetch(`/tts/voices/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (!r.ok) throw new Error(await r.text());
    await loadTtsVoices();
  } catch (e) {
    alert(`삭제 실패: ${e.message}`);
  }
}

document.getElementById('tts-voice-upload-btn').addEventListener('click', async () => {
  const nameInput = document.getElementById('tts-voice-name');
  const fileInput = document.getElementById('tts-voice-file');
  const name = nameInput.value.trim();
  if (!name) { alert('보이스 이름을 입력하세요.'); return; }
  if (!fileInput.files.length) { alert('참조 음성 파일을 선택하세요.'); return; }

  const fd = new FormData();
  fd.set('name', name);
  fd.set('file', fileInput.files[0]);

  try {
    const r = await fetch('/tts/voices', { method: 'POST', body: fd });
    if (!r.ok) throw new Error(await r.text());
    nameInput.value = '';
    fileInput.value = '';
    await loadTtsVoices();
  } catch (e) {
    alert(`업로드 실패: ${e.message}`);
  }
});

// ─── Synthesize ──────────────────────────────────────────────────────────────

const ttsStatus = document.getElementById('tts-status');
const ttsResultSection = document.getElementById('tts-result-section');
const ttsResultAudio = document.getElementById('tts-result-audio');
let ttsLastAudioUrl = null;

document.getElementById('tts-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  const text = document.getElementById('tts-text').value.trim();
  if (!text) { ttsStatus.textContent = '텍스트를 입력하세요.'; return; }
  if (!ttsVoiceSel.value) { ttsStatus.textContent = '보이스를 먼저 등록하세요.'; return; }

  const fd = new FormData();
  fd.set('text', text);
  fd.set('backend', ttsBackendSel.value);
  fd.set('language', ttsLanguageSel.value);
  fd.set('voice', ttsVoiceSel.value);

  ttsStatus.textContent = '합성 요청 중... (첫 호출은 모델 로딩 때문에 오래 걸릴 수 있습니다)';
  document.getElementById('tts-submit-btn').disabled = true;
  ttsResultSection.style.display = 'none';

  try {
    const resp = await fetch('/tts/synthesize', { method: 'POST', body: fd });
    const payload = await resp.json();
    if (!resp.ok) throw new Error(payload.detail || JSON.stringify(payload));
    ttsLastAudioUrl = payload.audio_url;
    ttsResultAudio.src = payload.audio_url;
    ttsResultSection.style.display = '';
    const dur = payload.duration ? ` ${payload.duration.toFixed(1)}s` : '';
    ttsStatus.textContent = `완료${dur}`;
  } catch (err) {
    ttsStatus.textContent = `실패: ${err.message}`;
  } finally {
    document.getElementById('tts-submit-btn').disabled = false;
  }
});

document.getElementById('tts-dl-btn').addEventListener('click', () => {
  if (!ttsLastAudioUrl) return;
  const a = document.createElement('a');
  a.href = ttsLastAudioUrl;
  a.download = 'speech.wav';
  document.body.appendChild(a); a.click(); a.remove();
});

// ─── History ─────────────────────────────────────────────────────────────────

const ttsHistoryList = document.getElementById('tts-history-list');
const ttsHistoryDetail = document.getElementById('tts-history-detail');
let ttsCurrentRecord = null;

async function loadTtsHistory() {
  ttsHistoryList.innerHTML = '<div class="muted" style="padding:16px">불러오는 중...</div>';
  ttsHistoryDetail.style.display = 'none';
  ttsHistoryList.style.display = '';
  try {
    const r = await fetch('/tts/history');
    const records = await r.json();
    renderTtsHistoryList(records);
  } catch (e) {
    ttsHistoryList.innerHTML = `<div class="muted" style="padding:16px">오류: ${esc(e.message)}</div>`;
  }
}

function renderTtsHistoryList(records) {
  if (!records.length) {
    ttsHistoryList.innerHTML = '<div class="muted" style="padding:16px">처리 내역이 없습니다.</div>';
    return;
  }
  let html = '<div class="history-table-wrap"><table class="history-table"><thead><tr>'
    + '<th>시각</th><th>백엔드</th><th>언어</th><th>보이스</th><th>길이</th><th>미리보기</th><th></th>'
    + '</tr></thead><tbody>';
  for (const rec of records) {
    const dur = rec.duration != null ? `${rec.duration.toFixed(1)}s` : '-';
    html += `<tr class="history-row" data-id="${esc(rec.id)}">
      <td class="mono">${esc(fmtTimestamp(rec.id))}</td>
      <td><span class="badge-backend">${esc(rec.backend || '-')}</span></td>
      <td>${esc(rec.language || '-')}</td>
      <td>${esc(rec.voice || '-')}</td>
      <td>${dur}</td>
      <td class="preview-cell">${esc(rec.text_preview || '')}</td>
      <td><button class="btn-view" data-id="${esc(rec.id)}">보기</button></td>
    </tr>`;
  }
  html += '</tbody></table></div>';
  ttsHistoryList.innerHTML = html;
  ttsHistoryList.querySelectorAll('.btn-view').forEach(btn => {
    btn.addEventListener('click', () => openTtsHistoryDetail(btn.dataset.id));
  });
}

async function openTtsHistoryDetail(id) {
  try {
    const r = await fetch(`/tts/history/${id}`);
    if (!r.ok) throw new Error(await r.text());
    ttsCurrentRecord = await r.json();
    ttsCurrentRecord._id = id;
    renderTtsDetail(ttsCurrentRecord);
    ttsHistoryList.style.display = 'none';
    ttsHistoryDetail.style.display = '';
  } catch (e) {
    alert(`불러오기 실패: ${e.message}`);
  }
}

function renderTtsDetail(data) {
  document.getElementById('tts-detail-title').textContent = fmtTimestamp(data._id || '');

  const meta = document.getElementById('tts-detail-meta');
  const fields = [
    ['백엔드', data.backend || '-'],
    ['언어', data.language || '-'],
    ['보이스', data.voice || '-'],
    ['길이', data.duration != null ? `${data.duration.toFixed(1)}s` : '-'],
    ['처리시각', fmtTimestamp(data._timestamp || data._id || '')],
  ];
  meta.innerHTML = fields.map(([k, v]) =>
    `<div class="meta-item"><span class="meta-key">${esc(k)}</span><span class="meta-val">${esc(v)}</span></div>`
  ).join('');

  const audioName = (data.audio_file || '').split('/').pop();
  document.getElementById('tts-detail-audio').src = audioName ? `/tts/audio/${encodeURIComponent(audioName)}` : '';
  document.getElementById('tts-detail-text').value = data.text || '';
}

document.getElementById('tts-history-back-btn').addEventListener('click', () => {
  ttsHistoryDetail.style.display = 'none';
  ttsHistoryList.style.display = '';
});

document.getElementById('tts-history-refresh-btn').addEventListener('click', loadTtsHistory);

document.getElementById('tts-detail-delete-btn').addEventListener('click', async () => {
  if (!ttsCurrentRecord || !ttsCurrentRecord._id) return;
  if (!confirm('이 내역을 삭제하시겠습니까? 생성된 오디오도 함께 삭제됩니다.')) return;
  try {
    const r = await fetch(`/tts/history/${ttsCurrentRecord._id}`, { method: 'DELETE' });
    if (!r.ok) throw new Error(await r.text());
    ttsHistoryDetail.style.display = 'none';
    ttsHistoryList.style.display = '';
    await loadTtsHistory();
  } catch (e) {
    alert(`삭제 실패: ${e.message}`);
  }
});

// Refresh history whenever its tab is opened
document.querySelector('[data-target="tab-tts-history"]').addEventListener('click', loadTtsHistory);

// ─── Init ─────────────────────────────────────────────────────────────────────

loadTtsConfig();
loadTtsVoices();