const express = require('express');
const { spawn, exec } = require('child_process');
const path = require('path');
const fs = require('fs');
const cors = require('cors');
const crypto = require('crypto');
const multer = require('multer');
const { Readable, Transform } = require('stream');
const { pipeline } = require('stream/promises');

const LOCAL_ENV_PATH = path.join(__dirname, '.env');
if (fs.existsSync(LOCAL_ENV_PATH)) {
  const envText = fs.readFileSync(LOCAL_ENV_PATH, 'utf-8');
  for (const rawLine of envText.split(/\r?\n/)) {
    const line = rawLine.trim();
    if (!line || line.startsWith('#')) {
      continue;
    }

    const separatorIndex = line.indexOf('=');
    if (separatorIndex <= 0) {
      continue;
    }

    const key = line.slice(0, separatorIndex).trim();
    let value = line.slice(separatorIndex + 1).trim();
    if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
      value = value.slice(1, -1);
    }

    if (key && process.env[key] === undefined) {
      process.env[key] = value;
    }
  }
}

const runtimeConfig = require('./server/config/runtime-config');
const { registerHealthRoutes } = require('./server/routes/health');
const { registerFileRoutes } = require('./server/routes/files');
const { registerVideoProxyRoutes } = require('./server/routes/video-proxy');
const { registerLlmRoutes } = require('./server/routes/llm');
const { registerQuicklyRoutes } = require('./server/routes/quickly');
const { registerUploadRoutes } = require('./server/routes/upload');
const { registerAudioExtractionRoutes } = require('./server/routes/audio-extraction');
const { registerVideoDownloadRoutes } = require('./server/routes/video-download');
const { registerVideoCompositeRoutes } = require('./server/routes/video-composite');
const { registerWhisperRoutes } = require('./server/routes/whisper');
const { registerRemixAssetUploadRoutes } = require('./server/routes/remix-asset-upload');
const { printStartupLog } = require('./server/startup-log');

const app = express();
const PORT = runtimeConfig.port;
const PROJECT_ROOT = __dirname;
const DATA_DIR = path.join(PROJECT_ROOT, 'data');
const DATA_VIDEO_DIR = path.join(DATA_DIR, 'videos');
const DATA_REMIX_ASSET_DIR = path.join(DATA_DIR, 'remix-assets');
const LEGACY_VIDEO_DIR = path.join(PROJECT_ROOT, 'src', 'video');
const VOICE_SPEAKER_ID_DOC_PATH = path.join(PROJECT_ROOT, 'docs', '音色创建', 'speaker_id.md');
const MANIFEST_PATH = path.join(DATA_DIR, 'manifest.json');
const LEGACY_MANIFEST_PATH = path.join(LEGACY_VIDEO_DIR, 'manifest.json');
const WHISPER_DIR = path.join(PROJECT_ROOT, 'Whisper');
const downloadTasks = new Map();
const transcriptTasks = new Map();
const TRANSCRIPT_TEMP_DIR = path.join(DATA_DIR, 'douyin-transcripts');
const DOUYIN_API_BASE_URL = runtimeConfig.douyinApiBaseUrl;
const TRANSCRIPTION_GATEWAY_BASE_URL = runtimeConfig.transcriptionGatewayBaseUrl;
const DOUYIN_GATEWAY_MAX_ATTEMPTS = runtimeConfig.douyinGatewayMaxAttempts;
const DOUYIN_API_ROUTES = {
  searchVideos: { method: 'POST', path: '/douyin/search/fetch_general_search_v2' },
  challengeSearch: { method: 'POST', path: '/douyin/search/fetch_challenge_search_v2' },
  videoDetail: { method: 'GET', path: '/douyin/app/v3/fetch_one_video_v3' },
  videoByShareUrl: { method: 'GET', path: '/douyin/app/v3/fetch_one_video_by_share_url' },
  userProfileWeb: { method: 'GET', path: '/douyin/web/handler_user_profile_v2' },
  userProfileApp: { method: 'GET', path: '/douyin/app/v3/handler_user_profile' },
  userPosts: { method: 'GET', path: '/douyin/app/v3/fetch_user_post_videos' },
  comments: { method: 'GET', path: '/douyin/app/v3/fetch_video_comments' },
  replies: { method: 'GET', path: '/douyin/app/v3/fetch_video_comment_replies' },
};
const QINIU_ACCESS_KEY = runtimeConfig.qiniu.accessKey;
const QINIU_SECRET_KEY = runtimeConfig.qiniu.secretKey;
const QINIU_BUCKET = runtimeConfig.qiniu.bucket;
const QINIU_CDN_DOMAIN = runtimeConfig.qiniu.cdnDomain;
const QINIU_CDN_PREFIX = runtimeConfig.qiniu.cdnPrefix;
const QINIU_UPLOAD_URL = runtimeConfig.qiniu.uploadUrl;
const VOLC_SPEECH_BASE_URL = runtimeConfig.volc.speechBaseUrl;
const VOLC_TTS_PROXY_BASE_URL = runtimeConfig.volc.ttsProxyBaseUrl;
const VOLC_SPEECH_API_KEY = runtimeConfig.volc.speechApiKey;
const VOLC_TTS_RESOURCE_ID = runtimeConfig.volc.ttsResourceId;
const VOLC_SPEECH_APP_KEY = runtimeConfig.volc.speechAppKey;
const VOLC_SPEECH_ACCESS_KEY = runtimeConfig.volc.speechAccessKey;

app.use(cors());
app.use(express.json({ limit: '50mb' }));

// 静态文件：提供视频文件的访问
const staticVideoOptions = {
  setHeaders: (res, filePath) => {
    if (filePath.match(/\.(mp4|mov|webm|mkv|avi)$/i)) {
      res.setHeader('Content-Type', 'video/mp4');
      res.setHeader('Accept-Ranges', 'bytes');
    }
  }
};
app.use('/api/video', express.static(DATA_VIDEO_DIR, staticVideoOptions));
app.use('/api/video', express.static(LEGACY_VIDEO_DIR, staticVideoOptions));

// ==================== 文件上传配置 ====================

const uploadStorage = multer.diskStorage({
  destination: (req, file, cb) => {
    const uploadDir = DATA_VIDEO_DIR;
    if (!fs.existsSync(uploadDir)) fs.mkdirSync(uploadDir, { recursive: true });
    cb(null, uploadDir);
  },
  filename: (req, file, cb) => {
    // 保留原始文件名，如有冲突则加时间戳
    const originalName = Buffer.from(file.originalname, 'latin1').toString('utf8');
    const ext = path.extname(originalName);
    const baseName = path.basename(originalName, ext);
    const targetPath = path.join(DATA_VIDEO_DIR, originalName);
    if (fs.existsSync(targetPath)) {
      cb(null, `${baseName}-${Date.now()}${ext}`);
    } else {
      cb(null, originalName);
    }
  }
});

const assetUpload = multer({
  storage: multer.memoryStorage(),
  // 200MB 以支持动作迁移 / 素材拼接场景的参考视频上传
  limits: { fileSize: 200 * 1024 * 1024 }
});

const upload = multer({
  storage: uploadStorage,
  limits: { fileSize: 500 * 1024 * 1024 }, // 500MB
  fileFilter: (req, file, cb) => {
    const allowedTypes = ['video/mp4', 'video/quicktime', 'video/x-msvideo', 'video/webm', 'video/x-matroska'];
    if (allowedTypes.includes(file.mimetype) || file.originalname.match(/\.(mp4|mov|avi|webm|mkv)$/i)) {
      cb(null, true);
    } else {
      cb(new Error('仅支持视频文件（mp4, mov, avi, webm, mkv）'));
    }
  }
});

// ==================== 工具函数 ====================

// 确保 data 目录存在
if (!fs.existsSync(DATA_DIR)) fs.mkdirSync(DATA_DIR, { recursive: true });
if (!fs.existsSync(DATA_VIDEO_DIR)) fs.mkdirSync(DATA_VIDEO_DIR, { recursive: true });
if (!fs.existsSync(DATA_REMIX_ASSET_DIR)) fs.mkdirSync(DATA_REMIX_ASSET_DIR, { recursive: true });

function ensureManifestFile() {
  if (fs.existsSync(MANIFEST_PATH)) return;
  if (fs.existsSync(LEGACY_MANIFEST_PATH)) {
    fs.copyFileSync(LEGACY_MANIFEST_PATH, MANIFEST_PATH);
    return;
  }
  fs.writeFileSync(MANIFEST_PATH, '[]', 'utf-8');
}

function readManifest() {
  ensureManifestFile();
  const raw = fs.readFileSync(MANIFEST_PATH, 'utf-8');
  return JSON.parse(raw);
}

function writeManifest(data) {
  ensureManifestFile();
  fs.writeFileSync(MANIFEST_PATH, JSON.stringify(data, null, 2), 'utf-8');
}

function resolveVideoPath(filename) {
  const runtimePath = path.join(DATA_VIDEO_DIR, filename);
  if (fs.existsSync(runtimePath)) return runtimePath;

  const legacyPath = path.join(LEGACY_VIDEO_DIR, filename);
  if (fs.existsSync(legacyPath)) return legacyPath;

  return runtimePath;
}

function removeFileIfExists(filePath) {
  try {
    if (filePath && fs.existsSync(filePath)) {
      fs.unlinkSync(filePath);
    }
  } catch (err) {
    // 忽略竞态条件 / 权限问题导致的删除失败，避免 ENOENT 等异常中断主流程
    if (err && err.code !== 'ENOENT') {
      console.warn(`⚠️ 删除文件失败 ${filePath}: ${err.message}`);
    }
  }
}

function removeDirectoryIfExists(dirPath) {
  if (fs.existsSync(dirPath)) {
    fs.rmSync(dirPath, { recursive: true, force: true });
  }
}

function toBase64Url(input) {
  return Buffer.from(input)
    .toString('base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_');
}

function buildQiniuUploadToken(key) {
  const deadline = Math.floor(Date.now() / 1000) + 3600;
  const putPolicy = {
    scope: `${QINIU_BUCKET}:${key}`,
    deadline
  };
  const encodedPutPolicy = toBase64Url(JSON.stringify(putPolicy));
  const sign = crypto
    .createHmac('sha1', QINIU_SECRET_KEY)
    .update(encodedPutPolicy)
    .digest('base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_');

  return `${QINIU_ACCESS_KEY}:${sign}:${encodedPutPolicy}`;
}

function buildDigitalHumanAssetKey(fileName, kind) {
  const rawName = Buffer.from(fileName || `asset-${Date.now()}`, 'latin1').toString('utf8');
  const ext = path.extname(rawName).toLowerCase();
  const safeExt = ext && /^[.a-z0-9]+$/i.test(ext) ? ext : '';
  const baseName = path.basename(rawName, ext).replace(/[^a-zA-Z0-9_-]/g, '_') || `asset-${Date.now()}`;
  const date = new Date();
  const yyyy = date.getFullYear();
  const mm = String(date.getMonth() + 1).padStart(2, '0');
  const dd = String(date.getDate()).padStart(2, '0');
  const timestamp = `${yyyy}${mm}${dd}-${Date.now()}`;
  return `${QINIU_CDN_PREFIX}/digital-human/${kind}/${yyyy}${mm}${dd}/${timestamp}-${baseName}${safeExt}`;
}

function createRequestId() {
  return typeof crypto.randomUUID === 'function'
    ? crypto.randomUUID()
    : `${Date.now()}-${crypto.randomBytes(8).toString('hex')}`;
}

function buildSpeechHeaders(contentType = 'application/json') {
  const headers = {
    'Content-Type': contentType,
    'X-Api-Request-Id': createRequestId()
  };

  if (VOLC_SPEECH_API_KEY) {
    headers['X-Api-Key'] = VOLC_SPEECH_API_KEY;
    return headers;
  }

  if (VOLC_SPEECH_APP_KEY && VOLC_SPEECH_ACCESS_KEY) {
    headers['X-Api-App-Key'] = VOLC_SPEECH_APP_KEY;
    headers['X-Api-Access-Key'] = VOLC_SPEECH_ACCESS_KEY;
    return headers;
  }

  throw new Error('未配置火山语音鉴权，请设置 VOLC_SPEECH_API_KEY 或 VOLC_SPEECH_APP_KEY + VOLC_SPEECH_ACCESS_KEY');
}

function normalizeOfficialSpeechResourceId(value) {
  const resourceId = String(value || '').trim();
  return /^seed-(tts|icl)-/i.test(resourceId) ? resourceId : '';
}

function inferOfficialSpeechResourceId(speaker, requestedResourceId = '') {
  const explicitResourceId = normalizeOfficialSpeechResourceId(requestedResourceId);
  if (explicitResourceId) {
    return explicitResourceId;
  }

  const configuredResourceId = normalizeOfficialSpeechResourceId(VOLC_TTS_RESOURCE_ID);
  if (configuredResourceId) {
    return configuredResourceId;
  }

  const normalizedSpeaker = String(speaker || '').trim();
  if (/^(S_|icl_|saturn_|dit_)/i.test(normalizedSpeaker)) {
    return 'seed-icl-2.0';
  }

  return 'seed-tts-2.0';
}

function clampNumber(value, fallback, min, max) {
  const numericValue = Number(value);
  if (!Number.isFinite(numericValue)) {
    return fallback;
  }

  return Math.min(max, Math.max(min, numericValue));
}

function clampOptionalNumber(value, min, max) {
  if (value === null || value === undefined || String(value).trim() === '') {
    return null;
  }

  const numericValue = Number(value);
  if (!Number.isFinite(numericValue)) {
    return null;
  }

  return Math.min(max, Math.max(min, numericValue));
}

function parseOptionalBoolean(value, fallback = false) {
  if (value === null || value === undefined || value === '') {
    return fallback;
  }

  if (typeof value === 'boolean') {
    return value;
  }

  if (typeof value === 'number') {
    return value !== 0;
  }

  const normalizedValue = String(value).trim().toLowerCase();
  if (['true', '1', 'yes', 'on'].includes(normalizedValue)) {
    return true;
  }

  if (['false', '0', 'no', 'off'].includes(normalizedValue)) {
    return false;
  }

  return fallback;
}

function normalizeVoiceSynthesisErrorMessage(message) {
  const rawMessage = String(message || '').trim();
  if (/resource ID is mismatched with speaker related resource/i.test(rawMessage)) {
    return '当前本地 X-Api-Key 与所选 speaker_id 不属于同一语音资源，无法直接使用 speaker_id 合成。请先通过音色复刻获取 timbreId 后再合成，或更换与该 speaker_id 匹配的 X-Api-Key。';
  }

  return rawMessage || '语音合成失败';
}

function mapVoiceDesignStatus(status) {
  switch (Number(status)) {
    case 0:
      return '未找到';
    case 1:
      return '训练中';
    case 2:
      return '可用';
    case 3:
      return '失败';
    case 4:
      return '已激活';
    default:
      return '未知';
  }
}

function mapVoiceCloneStatus(status) {
  switch (String(status ?? '')) {
    case '0':
      return '未占用';
    case '1':
      return '可用';
    case '2':
      return '训练中';
    case '3':
      return '失败';
    case '404':
      return '已删除';
    default:
      return '未知';
  }
}

function normalizeBearerToken(token) {
  const rawToken = String(token || '').trim();
  if (!rawToken) {
    return '';
  }

  return /^Bearer\s+/i.test(rawToken) ? rawToken : `Bearer ${rawToken}`;
}

function inferAudioFormat(file) {
  const mimeType = String(file?.mimetype || '').toLowerCase();
  if (mimeType.includes('mpeg') || mimeType.includes('mp3')) {
    return 'mp3';
  }
  if (mimeType.includes('wav')) {
    return 'wav';
  }
  if (mimeType.includes('m4a') || mimeType.includes('mp4')) {
    return 'm4a';
  }
  if (mimeType.includes('aac')) {
    return 'aac';
  }
  if (mimeType.includes('flac')) {
    return 'flac';
  }
  if (mimeType.includes('ogg') || mimeType.includes('opus')) {
    return 'ogg_opus';
  }
  if (mimeType.includes('pcm')) {
    return 'pcm';
  }

  const ext = path.extname(file?.originalname || '').toLowerCase();
  switch (ext) {
    case '.wav':
      return 'wav';
    case '.m4a':
      return 'm4a';
    case '.aac':
      return 'aac';
    case '.flac':
      return 'flac';
    case '.ogg':
    case '.opus':
      return 'ogg_opus';
    case '.pcm':
      return 'pcm';
    case '.mp3':
    default:
      return 'mp3';
  }
}

async function readFetchResponse(response) {
  const rawText = await response.text();
  let payload = null;
  try {
    payload = rawText ? JSON.parse(rawText) : null;
  } catch {
    payload = null;
  }

  return {
    rawText,
    payload
  };
}

function extractPrimaryVoiceModel(timbre) {
  if (!Array.isArray(timbre?.models) || timbre.models.length === 0) {
    return {};
  }

  return timbre.models[0] || {};
}

function readVoiceSpeakerIdOptions() {
  if (!fs.existsSync(VOICE_SPEAKER_ID_DOC_PATH)) {
    return [];
  }

  const rawText = fs.readFileSync(VOICE_SPEAKER_ID_DOC_PATH, 'utf-8');
  const seen = new Set();
  const options = [];

  for (const rawLine of rawText.split(/\r?\n/)) {
    const speakerId = rawLine.trim().match(/^S_[A-Za-z0-9]+$/)?.[0] || '';
    if (!speakerId || seen.has(speakerId)) {
      continue;
    }
    seen.add(speakerId);
    options.push(speakerId);
  }

  return options;
}

function upsertVoiceProfile(profile) {
  const profiles = readDataFile('voice-profiles');
  const existingIndex = profiles.findIndex((item) => (
    (!!profile.timbre_id && item.timbre_id === profile.timbre_id)
    || (!!profile.id && item.id === profile.id)
  ));

  if (existingIndex >= 0) {
    const existingProfile = profiles[existingIndex];
    const nextProfile = {
      ...existingProfile,
      ...profile,
      id: existingProfile.id || profile.id,
      created_at: existingProfile.created_at || profile.created_at,
      updated_at: profile.updated_at || new Date().toISOString()
    };
    profiles[existingIndex] = nextProfile;
    writeDataFile('voice-profiles', profiles);
    return nextProfile;
  }

  profiles.unshift(profile);
  writeDataFile('voice-profiles', profiles);
  return profile;
}

async function requestVolcTtsJson(endpoint, requestBody) {
  const response = await fetch(`${VOLC_TTS_PROXY_BASE_URL}/${endpoint}`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify(requestBody)
  });

  const { rawText, payload } = await readFetchResponse(response);
  if (!response.ok) {
    const error = new Error(payload?.error?.message || payload?.message || payload?.error || rawText || 'TTS 请求失败');
    error.status = response.status;
    error.detail = payload || rawText || '';
    throw error;
  }

  return payload;
}

async function proxyVolcTtsStream(endpoint, requestBody, res) {
  const response = await fetch(`${VOLC_TTS_PROXY_BASE_URL}/${endpoint}`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify(requestBody)
  });

  if (!response.ok) {
    const { rawText, payload } = await readFetchResponse(response);
    const error = new Error(payload?.error?.message || payload?.message || payload?.error || rawText || 'TTS 流式请求失败');
    error.status = response.status;
    error.detail = payload || rawText || '';
    throw error;
  }

  res.status(response.status);
  res.setHeader('Content-Type', response.headers.get('content-type') || 'application/x-ndjson; charset=utf-8');
  res.setHeader('Cache-Control', 'no-cache, no-transform');

  if (!response.body) {
    res.end();
    return;
  }

  await pipeline(Readable.fromWeb(response.body), res);
}

async function synthesizeVoiceAudio({ token, speaker, timbreId, text, ssml, xApiResourceId, model, isStream = false, audioParams = {}, additions = {} }) {
  const normalizedSpeaker = String(speaker || '').trim();
  const fallbackSpeaker = String(timbreId || '').trim();
  const resolvedSpeaker = normalizedSpeaker || fallbackSpeaker;
  const requestedResourceId = String(xApiResourceId || '').trim();
  const headerResourceId = inferOfficialSpeechResourceId(resolvedSpeaker, requestedResourceId);
  const resolvedModel = String(model || '').trim();
  const serializedAdditions = Object.keys(additions).length > 0 ? JSON.stringify(additions) : '';
  const requestBody = {
    req_params: {
      ...(ssml ? { ssml } : { text }),
      speaker: resolvedSpeaker,
      audio_params: {
        format: audioParams.format || 'mp3',
        sample_rate: audioParams.sampleRate ?? 24000,
        ...(audioParams.speechRate === null || audioParams.speechRate === undefined ? {} : { speech_rate: audioParams.speechRate }),
        ...(audioParams.loudnessRate === null || audioParams.loudnessRate === undefined ? {} : { loudness_rate: audioParams.loudnessRate }),
        ...(audioParams.emotion ? { emotion: audioParams.emotion } : {}),
        ...(audioParams.emotionScale === null || audioParams.emotionScale === undefined ? {} : { emotion_scale: audioParams.emotionScale }),
        ...(audioParams.enableSubtitle ? { enable_subtitle: true } : {})
      },
      ...(serializedAdditions ? { additions: serializedAdditions } : {}),
      ...(resolvedModel ? { model: resolvedModel } : {})
    }
  };

  const headers = buildSpeechHeaders();
  headers['X-Api-Resource-Id'] = headerResourceId;
  headers['Connection'] = 'keep-alive';

  const response = await fetch(`${VOLC_SPEECH_BASE_URL}/api/v3/tts/unidirectional`, {
    method: 'POST',
    headers,
    body: JSON.stringify(requestBody)
  });

  const { rawText, payload } = await readFetchResponse(response);
  if (!response.ok) {
    const error = new Error(normalizeVoiceSynthesisErrorMessage(payload?.error?.message || payload?.message || payload?.error || rawText || 'TTS 请求失败'));
    error.status = response.status;
    error.detail = payload || rawText || '';
    throw error;
  }

  if (Number(payload?.code) !== 200 || !payload?.data?.audioUrl) {
    const error = new Error(normalizeVoiceSynthesisErrorMessage(payload?.error?.message || payload?.message || '语音合成失败'));
    error.status = 502;
    error.detail = payload || '';
    throw error;
  }

  return {
    audioUrl: payload.data.audioUrl,
    workId: payload.data.workId || '',
    payload
  };
}

function createHttpError(message, status = 500, detail = '') {
  const error = new Error(message || '请求失败');
  error.status = status;
  error.detail = detail;
  return error;
}

function inferAudioFormatFromUrl(url) {
  try {
    const parsed = new URL(String(url || '').trim());
    return inferAudioFormat({ originalname: parsed.pathname || '', mimetype: '' });
  } catch {
    return inferAudioFormat({ originalname: String(url || '').trim(), mimetype: '' });
  }
}

function normalizeVoiceClonePayload(body) {
  const audioData = body?.audioData && typeof body.audioData === 'object' ? body.audioData : {};
  const extraParams = body?.extra_params && typeof body.extra_params === 'object' ? body.extra_params : {};
  return {
    token: normalizeBearerToken(body?.token) || runtimeConfig.voice.defaultToken,
    name: String(body?.name || body?.displayName || '').trim(),
    timbreId: String(body?.timbreId || '').trim(),
    speakerId: String(body?.speaker_id || body?.speakerId || '').trim(),
    audioData: {
      url: String(audioData?.url || '').trim(),
      base64: String(audioData?.base64 || '').trim(),
      format: String(audioData?.format || '').trim().toLowerCase(),
      text: String(audioData?.text || body?.audioText || '').trim()
    },
    language: Number(body?.language ?? 0) === 1 ? 1 : 0,
    demoText: String(extraParams?.demo_text || body?.sampleText || '').trim(),
    sourceAudioName: String(body?.sourceAudioName || body?.source_audio_name || '').trim(),
    sourceAudioFormat: String(body?.sourceAudioFormat || body?.source_audio_format || '').trim().toLowerCase()
  };
}

function normalizeVoiceSynthesisPayload(body) {
  const rawAudioParams = body?.audio_params && typeof body.audio_params === 'object'
    ? body.audio_params
    : (body?.audioParams && typeof body.audioParams === 'object' ? body.audioParams : {});
  const rawAdditions = body?.additions && typeof body.additions === 'object' ? body.additions : {};
  const formatCandidate = String(rawAudioParams?.format || '').trim().toLowerCase();
  const format = ['mp3', 'ogg_opus', 'pcm'].includes(formatCandidate) ? formatCandidate : 'mp3';
  const sampleRateCandidate = Number(rawAudioParams?.sampleRate ?? rawAudioParams?.sample_rate);
  const sampleRate = [8000, 16000, 22050, 24000, 32000, 44100, 48000].includes(sampleRateCandidate) ? sampleRateCandidate : 24000;
  const speechRate = clampNumber(rawAudioParams?.speechRate ?? rawAudioParams?.speech_rate, 0, -50, 100);
  const loudnessRate = clampNumber(rawAudioParams?.loudnessRate ?? rawAudioParams?.loudness_rate, 0, -50, 100);
  const emotion = String(rawAudioParams?.emotion || '').trim();
  const emotionScale = clampOptionalNumber(rawAudioParams?.emotionScale ?? rawAudioParams?.emotion_scale, 1, 5);
  const enableSubtitle = parseOptionalBoolean(rawAudioParams?.enableSubtitle ?? rawAudioParams?.enable_subtitle, false);
  const silenceDuration = clampOptionalNumber(rawAdditions?.silenceDuration ?? rawAdditions?.silence_duration, 0, 30000);
  const enableLanguageDetector = parseOptionalBoolean(rawAdditions?.enableLanguageDetector ?? rawAdditions?.enable_language_detector, false);
  const disableMarkdownFilter = parseOptionalBoolean(rawAdditions?.disableMarkdownFilter ?? rawAdditions?.disable_markdown_filter, false);
  const disableEmojiFilter = parseOptionalBoolean(rawAdditions?.disableEmojiFilter ?? rawAdditions?.disable_emoji_filter, false);
  const explicitLanguage = String((rawAdditions?.explicitLanguage ?? rawAdditions?.explicit_language) || '').trim();
  return {
    token: normalizeBearerToken(body?.token) || runtimeConfig.voice.defaultToken,
    text: String(body?.text || '').trim(),
    ssml: String(body?.ssml || '').trim(),
    timbreId: String(body?.timbreId || body?.timbre_id || '').trim(),
    speakerId: String(body?.speaker_id || body?.speakerId || body?.speaker || body?.volcengine_voice_type || body?.voiceType || body?.voice_type || '').trim(),
    isStream: parseOptionalBoolean(body?.isStream ?? body?.is_stream, true),
    xApiResourceId: String(body?.x_api_resource_id || body?.xApiResourceId || '').trim(),
    model: String(body?.model || '').trim(),
    audioParams: {
      format,
      sampleRate,
      speechRate,
      loudnessRate,
      emotion,
      emotionScale,
      enableSubtitle
    },
    additions: {
      ...(silenceDuration === null ? {} : { silence_duration: silenceDuration }),
      ...(enableLanguageDetector ? { enable_language_detector: true } : {}),
      ...(disableMarkdownFilter ? { disable_markdown_filter: true } : {}),
      ...(disableEmojiFilter ? { disable_emoji_filter: true } : {}),
      ...(explicitLanguage ? { explicit_language: explicitLanguage } : {})
    }
  };
}

function buildProxySynthesisPayload(payload) {
  return {
    token: payload.token,
    ...(payload.text ? { text: payload.text } : {}),
    ...(payload.ssml ? { ssml: payload.ssml } : {}),
    ...(payload.timbreId ? { timbreId: payload.timbreId } : {}),
    ...(payload.speakerId ? { speaker_id: payload.speakerId } : {}),
    isStream: !!payload.isStream,
    ...(payload.xApiResourceId ? { x_api_resource_id: payload.xApiResourceId } : {}),
    ...(payload.model ? { model: payload.model } : {}),
    audio_params: {
      format: payload.audioParams.format,
      sample_rate: payload.audioParams.sampleRate,
      speech_rate: payload.audioParams.speechRate,
      loudness_rate: payload.audioParams.loudnessRate,
      ...(payload.audioParams.emotion ? { emotion: payload.audioParams.emotion } : {}),
      ...(payload.audioParams.emotionScale === null || payload.audioParams.emotionScale === undefined ? {} : { emotion_scale: payload.audioParams.emotionScale }),
      ...(payload.audioParams.enableSubtitle ? { enable_subtitle: true } : {})
    },
    ...(Object.keys(payload.additions).length > 0 ? { additions: payload.additions } : {})
  };
}

async function executeVoiceCloneRequest(payload) {
  if (!payload.token) {
    throw createHttpError('缺少 token 参数', 400);
  }
  if (!payload.name) {
    throw createHttpError('缺少音色名称 name', 400);
  }
  if (!payload.timbreId && !payload.speakerId) {
    throw createHttpError('timbreId与speaker_id不能同时为空', 400);
  }
  if (!payload.audioData.url && !payload.audioData.base64) {
    throw createHttpError('音频url或base64至少提供一个', 400);
  }
  if (payload.demoText && (payload.demoText.length < 4 || payload.demoText.length > 80)) {
    throw createHttpError('试听文本长度需在 4-80 字之间', 400);
  }

  const clonePayload = await requestVolcTtsJson('voice_clone', {
    token: payload.token,
    name: payload.name,
    ...(payload.timbreId ? { timbreId: payload.timbreId } : {}),
    ...(payload.speakerId ? { speaker_id: payload.speakerId } : {}),
    audioData: {
      ...(payload.audioData.url ? { url: payload.audioData.url } : {}),
      ...(payload.audioData.base64 ? { base64: payload.audioData.base64 } : {}),
      ...(payload.audioData.format ? { format: payload.audioData.format } : {}),
      ...(payload.audioData.text ? { text: payload.audioData.text } : {})
    },
    language: payload.language,
    ...(payload.demoText ? { extra_params: { demo_text: payload.demoText } } : {})
  });

  if (Number(clonePayload?.code) !== 200 || !clonePayload?.data?.timbre?.objectId) {
    throw createHttpError(clonePayload?.error?.message || clonePayload?.message || '音色复刻失败', 502, clonePayload || '');
  }

  const timbre = clonePayload.data.timbre;
  const primaryModel = extractPrimaryVoiceModel(timbre);
  const now = new Date().toISOString();
  const profile = upsertVoiceProfile({
    id: `VOICE-${Date.now()}`,
    name: payload.name,
    creation_mode: 'clone',
    speaker_id: timbre?.speaker_id || payload.speakerId,
    timbre_id: timbre?.objectId || payload.timbreId || '',
    sample_text: payload.demoText,
    source_audio_text: payload.audioData.text,
    source_audio_name: payload.sourceAudioName,
    source_audio_format: payload.sourceAudioFormat || payload.audioData.format || inferAudioFormatFromUrl(payload.audioData.url),
    text_prompt: '',
    language: payload.language,
    status: Number.isFinite(Number(timbre?.status)) ? Number(timbre.status) : null,
    status_label: mapVoiceCloneStatus(timbre?.status),
    demo_audio: primaryModel?.demo_audio || '',
    available_training_times: null,
    image_prompt_name: '',
    x_api_resource_id: Array.isArray(primaryModel?.x_api_resource_id) ? String(primaryModel.x_api_resource_id[0] || '') : '',
    model_version: String(primaryModel?.version || ''),
    icl_speaker_id: String(primaryModel?.icl_speaker_id || ''),
    occupied: !!timbre?.occupied,
    synthesized_audio_url: '',
    synthesized_work_id: '',
    last_synthesis_text: '',
    latest_audio_url: primaryModel?.demo_audio || '',
    message: clonePayload?.data?.tip || '音色复刻成功',
    request_id: clonePayload?.request_id || '',
    created_at: now,
    updated_at: now
  });

  return {
    clonePayload,
    profile
  };
}

function findVoiceProfileForSynthesis(payload) {
  const profiles = readDataFile('voice-profiles');
  if (payload.timbreId) {
    const byTimbreId = profiles.find((item) => item.timbre_id === payload.timbreId);
    if (byTimbreId) {
      return byTimbreId;
    }
  }

  if (payload.speakerId) {
    return profiles.find((item) => (
      String(item.icl_speaker_id || '').trim() === payload.speakerId
      || String(item.speaker_id || '').trim() === payload.speakerId
    )) || null;
  }

  return null;
}

function persistSynthesisProfile(profile, payload, synthesis) {
  if (!profile) {
    return null;
  }

  return upsertVoiceProfile({
    ...profile,
    synthesized_audio_url: synthesis.audioUrl,
    synthesized_work_id: synthesis.workId,
    last_synthesis_text: payload.text,
    last_synthesis_ssml: payload.ssml,
    last_synthesis_x_api_resource_id: payload.xApiResourceId || profile.x_api_resource_id || '',
    last_synthesis_model: payload.model,
    last_synthesis_format: payload.audioParams.format,
    last_synthesis_sample_rate: payload.audioParams.sampleRate,
    last_synthesis_speech_rate: payload.audioParams.speechRate,
    last_synthesis_loudness_rate: payload.audioParams.loudnessRate,
    last_synthesis_emotion: payload.audioParams.emotion,
    last_synthesis_emotion_scale: payload.audioParams.emotionScale,
    last_synthesis_enable_subtitle: !!payload.audioParams.enableSubtitle,
    last_synthesis_silence_duration: payload.additions?.silence_duration ?? null,
    last_synthesis_enable_language_detector: !!payload.additions?.enable_language_detector,
    last_synthesis_disable_markdown_filter: !!payload.additions?.disable_markdown_filter,
    last_synthesis_disable_emoji_filter: !!payload.additions?.disable_emoji_filter,
    last_synthesis_explicit_language: String(payload.additions?.explicit_language || '').trim(),
    latest_audio_url: synthesis.audioUrl || profile.latest_audio_url || profile.demo_audio || '',
    updated_at: new Date().toISOString()
  });
}

async function executeVoiceSynthesisRequest(payload) {
  if (!payload.token) {
    throw createHttpError('缺少 token 参数', 400);
  }
  if (!payload.text && !payload.ssml) {
    throw createHttpError('文本内容不能为空，text与ssml不能同时为空', 400);
  }

  const matchedProfile = findVoiceProfileForSynthesis(payload);

  if (payload.timbreId) {
    const proxyPayload = await requestVolcTtsJson('unidirectional', buildProxySynthesisPayload({
      ...payload,
      isStream: false
    }));

    if (Number(proxyPayload?.code) !== 200 || !proxyPayload?.data?.audioUrl) {
      throw createHttpError(proxyPayload?.error?.message || proxyPayload?.message || '语音合成失败', 502, proxyPayload || '');
    }

    const profile = persistSynthesisProfile(matchedProfile, payload, {
      audioUrl: proxyPayload.data.audioUrl,
      workId: proxyPayload.data.workId || ''
    });

    return {
      response: {
        ...proxyPayload,
        ...(profile ? { profile } : {})
      },
      profile
    };
  }

  if (!payload.speakerId) {
    throw createHttpError('音色id不能为空', 400);
  }

  const synthesis = await synthesizeVoiceAudio({
    token: payload.token,
    speaker: payload.speakerId,
    timbreId: matchedProfile?.timbre_id || '',
    text: payload.text,
    ssml: payload.ssml,
    xApiResourceId: payload.xApiResourceId || matchedProfile?.x_api_resource_id || '',
    model: payload.model,
    isStream: false,
    audioParams: payload.audioParams,
    additions: payload.additions
  });

  const profile = persistSynthesisProfile(matchedProfile, payload, synthesis);

  return {
    response: {
      code: 200,
      data: {
        workId: synthesis.workId,
        audioUrl: synthesis.audioUrl
      },
      ...(profile ? { profile } : {})
    },
    profile
  };
}

// 通用 JSON 数据文件读写
app.post('/api/volcengine/tts/unidirectional', async (req, res) => {
  try {
    const payload = normalizeVoiceSynthesisPayload(req.body || {});
    const { response } = await executeVoiceSynthesisRequest(payload);
    res.json(response);
  } catch (error) {
    res.status(error.status || error.statusCode || 500).json({
      code: error.status || error.statusCode || 500,
      success: false,
      error: error.message || 'TTS 请求失败',
      detail: error.detail || '',
    });
  }
});

app.post('/api/volcengine/tts/voice_clone', async (req, res) => {
  try {
    const payload = normalizeVoiceClonePayload(req.body || {});
    const { response } = await executeVoiceCloneRequest(payload);
    res.json(response);
  } catch (error) {
    res.status(error.status || error.statusCode || 500).json({
      code: error.status || error.statusCode || 500,
      success: false,
      error: error.message || '音色复刻请求失败',
      detail: error.detail || '',
    });
  }
});

const LOCAL_JIMENG_ALLOWED_ENDPOINTS = new Set([
  'getClothesV2',
  'getImgByImg',
  'getImgV4',
  'getText2ImgV3',
  'getText2ImgV31',
  'getImg2ImgV3',
  'getImgV4_pod',
  'getImgV4_goods',
  'getInpaint',
  'getSuperResolution',
  'getVideoV3_720p',
  'getVideoV3_1080p',
  'getVideoV3_Pro',
  'getActor',
  'getActorV2',
  'getDataByTask02',
  'getOhIdentifyMain',
  'getOhDateByTask',
  'getOhDetectMain',
  'getOmniHuman',
]);

const LOCAL_JIMENG_CHARGEABLE_ENDPOINTS = new Set([
  'getImgV4',
  'getText2ImgV3',
  'getText2ImgV31',
  'getImg2ImgV3',
  'getImgV4_pod',
  'getImgV4_goods',
  'getInpaint',
  'getSuperResolution',
  'getVideoV3_720p',
  'getVideoV3_1080p',
  'getVideoV3_Pro',
  'getActor',
  'getActorV2',
  'getOmniHuman',
]);

app.post('/api/volcengine/jimeng/:endpoint', async (req, res) => {
  const endpoint = String(req.params.endpoint || '').trim();
  if (!LOCAL_JIMENG_ALLOWED_ENDPOINTS.has(endpoint)) {
    return res.status(400).json({ code: 400, success: false, error: '不支持的即梦接口' });
  }

  if (LOCAL_JIMENG_CHARGEABLE_ENDPOINTS.has(endpoint)) {
    const sessionToken = String(req.headers['x-parse-session-token'] || req.body?.sessionToken || '').trim();
    if (!sessionToken) {
      return res.status(401).json({
        code: 401,
        success: false,
        error: 'Jimeng generation requires a logged-in Parse session for APIG billing.',
      });
    }
    return res.status(409).json({
      code: 409,
      success: false,
      error: 'Chargeable Jimeng generation must go through cloud-functions/11-jimengManager.js for APIG billing.',
    });
  }

  try {
    const token = runtimeConfig.normalizeBearerToken(
      req.body?.token
      || process.env.JIMENG_TOKEN
      || process.env.VOLC_JIMENG_TOKEN
      || process.env.VOICE_TOKEN
    );
    if (!token) {
      return res.status(400).json({ code: 400, success: false, error: '未配置 JIMENG_TOKEN、VOLC_JIMENG_TOKEN 或 VOICE_TOKEN' });
    }

    const baseUrl = String(process.env.JIMENG_BASE_URL || 'https://server.fmode.cn/api/volcengine/jimeng').replace(/\/+$/, '');
    const payload = stripEmpty({ ...(req.body || {}), token });
    const data = await requestJimengGatewayWithRetry(`${baseUrl}/${endpoint}`, payload, endpoint);
    res.json(data);
  } catch (error) {
    res.status(error.status || 500).json({
      code: error.status || 500,
      success: false,
      error: error.message || '即梦请求失败',
      detail: error.detail || '',
    });
  }
});

app.get('/api/volcengine/jimeng/work/:workId', async (req, res) => {
  try {
    const workId = String(req.params.workId || '').trim();
    if (!workId) return res.status(400).json({ code: 400, success: false, error: '缺少作品 ID' });
    const response = await fetch(`${runtimeConfig.parseApiHost}/parse/classes/ImagineWork/${encodeURIComponent(workId)}`, {
      headers: { 'X-Parse-Application-Id': runtimeConfig.parseAppId },
    });
    const { rawText, payload } = await readFetchResponse(response);
    if (!response.ok) {
      return res.status(response.status).json({
        code: response.status,
        success: false,
        error: payload?.error || rawText || '查询作品结果失败',
      });
    }
    res.json({ code: 200, success: true, data: payload });
  } catch (error) {
    res.status(500).json({ code: 500, success: false, error: error.message || '查询作品结果失败' });
  }
});

async function requestJimengGatewayWithRetry(url, body, endpoint) {
  let lastError = null;
  const maxAttempts = Math.max(1, Number(process.env.JIMENG_LOCAL_MAX_ATTEMPTS || 3));
  for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
    try {
      const response = await fetch(url, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(body),
      });
      const { rawText, payload } = await readFetchResponse(response);
      const status = Number(payload?.code || response.status || 0);
      const retryable = !response.ok || status === 408 || status === 429 || status >= 500;
      if (!retryable || attempt >= maxAttempts) {
        if (!response.ok) {
          const error = new Error(payload?.error?.message || payload?.message || payload?.error || rawText || `HTTP ${response.status}`);
          error.status = response.status;
          error.detail = payload || rawText || '';
          throw error;
        }
        return payload || { code: 500, success: false, error: '即梦返回异常' };
      }
      await sleep(Math.min(12000, 1200 * attempt * attempt));
    } catch (error) {
      lastError = error;
      if (attempt >= maxAttempts) break;
      await sleep(Math.min(12000, 1200 * attempt * attempt));
    }
  }

  const message = formatNetworkError(lastError);
  const error = new Error(`即梦数据上游请求失败：${message}；endpoint=${endpoint}`);
  error.status = lastError?.status || 500;
  error.detail = lastError?.detail || '';
  throw error;
}

function readDataFile(name) {
  const p = path.join(DATA_DIR, `${name}.json`);
  if (!fs.existsSync(p)) { fs.writeFileSync(p, '[]', 'utf-8'); return []; }
  return JSON.parse(fs.readFileSync(p, 'utf-8'));
}

function writeDataFile(name, data) {
  fs.writeFileSync(path.join(DATA_DIR, `${name}.json`), JSON.stringify(data, null, 2), 'utf-8');
}

function isSafeRemoteUrl(url) {
  try {
    const parsed = new URL(url);
    return ['http:', 'https:'].includes(parsed.protocol);
  } catch {
    return false;
  }
}

function sanitizeFilename(filename) {
  const safeName = String(filename || '')
    .replace(/[<>:"/\\|?*\x00-\x1F]/g, '_')
    .trim();

  return safeName || `video-${Date.now()}.mp4`;
}

function ensureVideoFilename(filename, sourceUrl = '') {
  const safeName = sanitizeFilename(filename);
  if (path.extname(safeName)) {
    return safeName;
  }

  try {
    const parsed = new URL(sourceUrl);
    const sourceExt = path.extname(parsed.pathname || '').toLowerCase();
    if (sourceExt) {
      return `${safeName}${sourceExt}`;
    }
  } catch {}

  return `${safeName}.mp4`;
}

function ensureUniqueVideoFilename(filename) {
  const ext = path.extname(filename) || '.mp4';
  const baseName = path.basename(filename, ext);
  let candidate = filename;
  let counter = 1;

  while (fs.existsSync(path.join(DATA_VIDEO_DIR, candidate)) || fs.existsSync(path.join(LEGACY_VIDEO_DIR, candidate))) {
    candidate = `${baseName}-${Date.now()}-${counter}${ext}`;
    counter += 1;
  }

  return candidate;
}

function createManagedVideoEntry({ filename, title, description, tags, thumbnail, duration, resolution, awemeId, authorName, size }) {
  const ext = path.extname(filename).replace('.', '').toLowerCase() || 'mp4';
  const now = new Date().toISOString();

  return {
    id: `VID-${Date.now()}`,
    title: title || path.basename(filename, path.extname(filename)),
    filename,
    size: size || 0,
    duration: Number(duration) || 0,
    created_at: now,
    modified_at: now,
    category: 'downloaded',
    tags: Array.isArray(tags) ? tags : [],
    description: description || '',
    thumbnail: thumbnail || '',
    source: 'downloaded',
    aweme_id: awemeId || '',
    metadata: {
      resolution: resolution || '未知',
      format: ext,
      authorName: authorName || ''
    }
  };
}

function normalizeRemoteUrls(primaryUrl, urls = []) {
  return [primaryUrl, ...(Array.isArray(urls) ? urls : [])].filter((url, index, list) => (
    typeof url === 'string'
    && isSafeRemoteUrl(url)
    && list.indexOf(url) === index
  ));
}

async function fetchRemoteVideoResponse(urls, requestHeaders = {}) {
  let lastError = null;

  for (const currentUrl of urls) {
    try {
      const response = await fetch(currentUrl, {
        method: 'GET',
        headers: requestHeaders,
        redirect: 'follow'
      });

      if (!response.ok) {
        const detail = await response.text().catch(() => '');
        lastError = new Error(`远程下载失败: ${response.status} ${response.statusText}${detail ? ` ${detail.slice(0, 200)}` : ''}`);
        continue;
      }

      if (!response.body) {
        lastError = new Error('远程响应缺少视频流');
        continue;
      }

      return { url: currentUrl, response };
    } catch (error) {
      lastError = error;
    }
  }

  throw lastError || new Error('没有可用的远程视频地址');
}

// ==================== Whisper 转录 ====================

registerWhisperRoutes(app, {
  exec,
  fs,
  path,
  projectRoot: PROJECT_ROOT,
  whisperDir: WHISPER_DIR,
  readManifest,
  writeManifest,
  resolveVideoPath
});
// ==================== Manifest 管理 ====================
// 已迁移至云函数 manifestManager（cloud-functions/01-manifestManager.js）；历史本地参考见 server/routes/manifest-legacy-reference.js。

// ==================== 视频上传 ====================

registerUploadRoutes(app, { upload, readManifest, writeManifest });

// 上传错误处理
app.use((err, req, res, next) => {
  if (err instanceof multer.MulterError) {
    if (err.code === 'LIMIT_FILE_SIZE') {
      return res.status(413).json({ error: '文件大小超过限制（最大 500MB）' });
    }
    return res.status(400).json({ error: `上传错误: ${err.message}` });
  }
  if (err) {
    return res.status(400).json({ error: err.message });
  }
  next();
});

registerAudioExtractionRoutes(app, {
  readManifest,
  resolveVideoPath,
  removeFileIfExists,
  dataRemixAssetDir: DATA_REMIX_ASSET_DIR,
  projectRoot: PROJECT_ROOT
});

registerRemixAssetUploadRoutes(app, {
  path,
  assetUpload,
  qiniuUploadUrl: QINIU_UPLOAD_URL,
  qiniuCdnDomain: QINIU_CDN_DOMAIN,
  buildDigitalHumanAssetKey,
  buildQiniuUploadToken
});
// ==================== 文件操作 ====================

registerFileRoutes(app, {
  fs,
  path,
  projectRoot: PROJECT_ROOT,
  whisperDir: WHISPER_DIR,
  readManifest
});

registerVideoDownloadRoutes(app, {
  path,
  fs,
  crypto,
  Readable,
  Transform,
  pipeline,
  dataVideoDir: DATA_VIDEO_DIR,
  downloadTasks,
  normalizeRemoteUrls,
  ensureVideoFilename,
  ensureUniqueVideoFilename,
  fetchRemoteVideoResponse,
  createManagedVideoEntry,
  readManifest,
  writeManifest,
  removeFileIfExists
});

// ==================== 视频流代理 ====================

registerVideoProxyRoutes(app, { isSafeRemoteUrl });

// ==================== AI 重塑记录 ====================

// ==================== AI 重塑记录 ====================
// 已迁移至云函数 remixManager（cloud-functions/05-remixManager.js）；历史本地参考见 server/routes/cloud-managed-legacy-reference.js。

// ==================== 一键成片（Quickly 代理） ====================

registerQuicklyRoutes(app, runtimeConfig.quickly);

// ==================== 视频合成（图片+音频 → 视频）====================

registerVideoCompositeRoutes(app, {
  fs,
  path,
  spawn,
  dataDir: DATA_DIR,
  removeFileIfExists
});
// ==================== 语音管理 ====================
// 已迁移至云函数 voiceManager（cloud-functions/06-voiceManager.js）；历史本地参考见 server/routes/cloud-managed-legacy-reference.js。

// ==================== 任务/历史/结果 ====================
// 已迁移至云函数 taskManager/historyManager/resultManager；历史本地参考见 server/routes/cloud-managed-legacy-reference.js。

// ==================== LLM 大模型代理 ====================

registerLlmRoutes(app, {
  llmBaseUrl: runtimeConfig.llm.baseUrl,
  llmApiKey: runtimeConfig.llm.apiKey
});

// ==================== Douyin transcript worker ====================

function cleanText(value) {
  return String(value || '').trim();
}

function getVocToken() {
  return cleanText(
    process.env.DOUYIN_API_TOKEN
    || process.env.VOC_TOKEN
    || process.env.TRANSCRIPTION_VOC_TOKEN
    || process.env.VOICE_TOKEN
    || process.env.OPENCLAW_VOC_TOKEN
    || process.env.VOC_SOCIAL_TOKEN
  );
}

function bearerAuth(token) {
  const value = cleanText(token);
  return /^Bearer\s+/i.test(value) ? value : `Bearer ${value}`;
}

function stripEmpty(value) {
  if (!value || typeof value !== 'object') return value;
  const out = Array.isArray(value) ? [] : {};
  for (const [key, val] of Object.entries(value)) {
    if (val === undefined || val === null || val === '') continue;
    if (val && typeof val === 'object' && !Array.isArray(val)) {
      const nested = stripEmpty(val);
      if (Object.keys(nested).length) out[key] = nested;
    } else {
      out[key] = val;
    }
  }
  return out;
}

function readGatewayError(data, fallback) {
  return data?.error?.message || data?.error || data?.mess || data?.message || data?.msg || data?.detail || fallback || '';
}

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function formatNetworkError(error) {
  const cause = error?.cause?.code || error?.cause?.message || '';
  return `${error?.message || 'fetch failed'}${cause ? `；cause=${cause}` : ''}`;
}

async function fetchDouyinGatewayWithRetry(url, init, routePath) {
  let lastError = null;
  const attemptLimit = /fetch_video_comments|fetch_video_comment_replies/.test(routePath)
    ? Math.max(DOUYIN_GATEWAY_MAX_ATTEMPTS, 6)
    : DOUYIN_GATEWAY_MAX_ATTEMPTS;
  for (let attempt = 1; attempt <= attemptLimit; attempt += 1) {
    try {
      const response = await fetch(url, init);
      if (response.ok || response.status < 500 || attempt >= attemptLimit) {
        return response;
      }
      console.warn(`[douyin-gateway] ${routePath} attempt ${attempt}/${attemptLimit} returned HTTP ${response.status}`);
      await response.body?.cancel().catch(() => {});
    } catch (error) {
      lastError = error;
      const reason = formatNetworkError(error);
      console.warn(`[douyin-gateway] ${routePath} attempt ${attempt}/${attemptLimit} failed: ${reason}`);
    }
    if (attempt < attemptLimit) {
      const delayMs = /fetch_video_comments|fetch_video_comment_replies/.test(routePath)
        ? Math.min(700 * attempt, 3000)
        : Math.min(300 * attempt, 1200);
      await sleep(delayMs);
    }
  }
  throw lastError || new Error('fetch failed');
}

async function requestDouyinGateway(routeName, params = {}, payload = {}) {
  const route = DOUYIN_API_ROUTES[routeName];
  if (!route) {
    throw Object.assign(new Error('不支持的抖音接口'), { statusCode: 400 });
  }

  const token = getVocToken();
  if (!token) {
    throw Object.assign(new Error('本地抖音数据网关未配置 DOUYIN_API_TOKEN、VOC_TOKEN 或 VOC_SOCIAL_TOKEN。'), { statusCode: 400 });
  }

  const url = new URL(`${DOUYIN_API_BASE_URL}${route.path}`);
  const init = {
    method: route.method,
    headers: {
      'Content-Type': 'application/json',
      Accept: 'application/json',
      Authorization: bearerAuth(token),
    },
  };

  if (route.method === 'GET') {
    const query = { ...(payload || {}), ...(params || {}) };
    if (routeName === 'comments' || routeName === 'replies') {
      query.count = Math.min(Math.max(Number(query.count) || 20, 1), 20);
    }
    for (const [key, value] of Object.entries(query)) {
      if (value !== undefined && value !== null && value !== '') {
        url.searchParams.set(key, String(value));
      }
    }
  } else {
    init.body = JSON.stringify(stripEmpty(payload || {}));
  }

  let response;
  try {
    response = await fetchDouyinGatewayWithRetry(url.toString(), init, route.path);
  } catch (error) {
    throw Object.assign(new Error(`本地抖音数据网关网络请求失败：${formatNetworkError(error)}；attempts=${DOUYIN_GATEWAY_MAX_ATTEMPTS}；base=${DOUYIN_API_BASE_URL} route=${route.path}`), {
      statusCode: 502,
    });
  }

  const text = await response.text();
  let data = null;
  try { data = text ? JSON.parse(text) : null; } catch {}
  if (!response.ok || data?.success === false) {
    const upstreamError = readGatewayError(data, text) || '上游未返回错误详情';
    throw Object.assign(new Error(`抖音数据接口请求失败：${upstreamError}；HTTP ${response.status}；base=${DOUYIN_API_BASE_URL} route=${route.path}`), {
      statusCode: response.status || 500,
    });
  }

  return data || { code: 500, success: false, error: '服务返回异常' };
}

app.post('/api/douyin/call', async (req, res) => {
  try {
    const { route, params = {}, payload = {}, optional = false } = req.body || {};
    const data = await requestDouyinGateway(route, params, payload);
    res.json({ success: true, data });
  } catch (error) {
    if (req.body?.optional) {
      return res.json({
        success: false,
        optional: true,
        error: error.message || '本地抖音数据网关调用失败',
      });
    }
    res.status(error.statusCode || 500).json({
      success: false,
      error: error.message || '本地抖音数据网关调用失败',
    });
  }
});

app.get('/api/douyin/diagnose', async (req, res) => {
  const routeName = cleanText(req.query.route || 'videoDetail');
  const route = DOUYIN_API_ROUTES[routeName] || DOUYIN_API_ROUTES.videoDetail;
  const result = {
    success: true,
    data: {
      baseUrl: DOUYIN_API_BASE_URL,
      routeName,
      routePath: route.path,
      tokenConfigured: !!getVocToken(),
      probe: null,
    },
  };
  if (String(req.query.probe || '') === '1') {
    try {
      result.data.probe = await requestDouyinGateway(routeName, { aweme_id: cleanText(req.query.awemeId) || '7592116912205630761' });
    } catch (error) {
      result.data.probe = { success: false, error: error.message || '探测失败' };
    }
  }
  res.json(result);
});

function createTranscriptJob(input) {
  const now = new Date().toISOString();
  return {
    id: `transcript_${Date.now()}_${crypto.randomBytes(4).toString('hex')}`,
    awemeId: cleanText(input.awemeId),
    analysisId: cleanText(input.analysisId),
    provider: cleanText(input.provider) || 'iflytek-gateway',
    status: 'queued',
    stageLabel: '已创建转写任务',
    progress: 0,
    warnings: [],
    createdAt: now,
    updatedAt: now
  };
}

function updateTranscriptJob(job, patch) {
  Object.assign(job, patch, { updatedAt: new Date().toISOString() });
  transcriptTasks.set(job.id, job);
  return job;
}

function findAwemeDetail(node, depth = 0) {
  if (!node || depth > 8) return null;
  if (Array.isArray(node)) {
    for (const item of node) {
      const found = findAwemeDetail(item, depth + 1);
      if (found) return found;
    }
    return null;
  }
  if (typeof node !== 'object') return null;
  if (node.aweme_id && node.video) return node;
  if (node.aweme_detail) return findAwemeDetail(node.aweme_detail, depth + 1) || node.aweme_detail;
  if (node.aweme_info) return findAwemeDetail(node.aweme_info, depth + 1) || node.aweme_info;
  for (const value of Object.values(node)) {
    const found = findAwemeDetail(value, depth + 1);
    if (found) return found;
  }
  return null;
}

function extractAwemeId(value) {
  const text = cleanText(value);
  const patterns = [/aweme_id=(\d+)/, /modal_id=(\d+)/, /douyin\.com\/video\/(\d+)/, /douyin\.com\/share\/video\/(\d+)/, /\b(\d{15,25})\b/];
  for (const pattern of patterns) {
    const match = text.match(pattern);
    if (match?.[1]) return match[1];
  }
  return /^\d{15,25}$/.test(text) ? text : '';
}

function decodeMaybeBase64Url(value) {
  const text = cleanText(value);
  if (/^https?:\/\//i.test(text)) return text;
  if (!/^[A-Za-z0-9+/=_-]{20,}$/.test(text)) return '';
  try {
    const decoded = Buffer.from(text, 'base64').toString('utf8');
    return /^https?:\/\//i.test(decoded) ? decoded : '';
  } catch {
    return '';
  }
}

function isLikelyMediaUrl(url) {
  return /^https?:\/\//i.test(url) && !/\.(?:jpg|jpeg|png|webp|gif)(?:\?|$)/i.test(url);
}

function inferMediaKind(pathParts, url) {
  const joined = pathParts.join('.').toLowerCase();
  if (/audio|mp4a|music|sound/.test(joined) || /audio|mp4a/i.test(url)) return 'audio';
  if (/play_addr|download_addr|bit_rate|video|media/.test(joined) || isLikelyMediaUrl(url)) return 'video';
  return 'unknown';
}

function collectMediaCandidates(node, pathParts = [], out = []) {
  if (!node) return out;
  if (Array.isArray(node)) {
    node.forEach((item, index) => collectMediaCandidates(item, [...pathParts, String(index)], out));
    return out;
  }
  if (typeof node !== 'object') return out;

  for (const [key, value] of Object.entries(node)) {
    const nextPath = [...pathParts, key];
    if (key === 'url_list' && Array.isArray(value)) {
      value.forEach((item, index) => {
        const url = decodeMaybeBase64Url(item);
        const kind = inferMediaKind(nextPath, url);
        if (url && ['audio', 'video'].includes(kind)) {
          out.push({
            url,
            kind,
            keyPath: nextPath.join('.'),
            index,
            dataSize: Number(node.data_size || node.size || 0),
            bitRate: Number(node.bit_rate || node.bitrate || node.real_bitrate || node.avg_bitrate || 0)
          });
        }
      });
    } else if (['main_url', 'backup_url', 'backup_url_1', 'url'].includes(key) && typeof value === 'string') {
      const url = decodeMaybeBase64Url(value);
      const kind = inferMediaKind(nextPath, url);
      if (url && ['audio', 'video'].includes(kind)) {
        out.push({
          url,
          kind,
          keyPath: nextPath.join('.'),
          dataSize: Number(node.data_size || node.size || 0),
          bitRate: Number(node.bit_rate || node.bitrate || node.real_bitrate || node.avg_bitrate || 0)
        });
      }
    }
    collectMediaCandidates(value, nextPath, out);
  }
  return out;
}

function selectMediaCandidate(detail) {
  const seen = new Set();
  const candidates = collectMediaCandidates(detail)
    .filter(item => isLikelyMediaUrl(item.url))
    .filter(item => {
      if (seen.has(item.url)) return false;
      seen.add(item.url);
      return true;
    });

  candidates.sort((a, b) => {
    const aPreferred = a.kind === 'audio' ? 0 : 1;
    const bPreferred = b.kind === 'audio' ? 0 : 1;
    if (aPreferred !== bPreferred) return aPreferred - bPreferred;
    const rank = item => {
      const keyPath = String(item.keyPath || '').toLowerCase();
      const url = String(item.url || '').toLowerCase();
      if (/strong_beat|beats_tr|music\./.test(`${keyPath} ${url}`)) return 5;
      if (item.kind === 'audio' && keyPath.includes('video.dynamic_audio_list')) return 0;
      if (item.kind === 'audio' && keyPath.includes('video.bit_rate_audio')) return 1;
      if (item.kind === 'audio' && keyPath.includes('music.')) return 4;
      return 2;
    };
    const aRank = rank(a);
    const bRank = rank(b);
    if (aRank !== bRank) return aRank - bRank;
    return Number(b.dataSize || 0) - Number(a.dataSize || 0);
  });

  return candidates[0] || null;
}

function durationFromDetail(detail) {
  const raw = detail?.video?.duration || detail?.duration || detail?.video_duration || detail?.durationMs;
  const numeric = Number(raw || 0);
  if (!Number.isFinite(numeric) || numeric <= 0) return 0;
  return numeric > 10000 ? Math.round(numeric) : Math.round(numeric * 1000);
}

function extensionFromUrl(url, fallback) {
  try {
    const parsed = new URL(url);
    const ext = path.extname(parsed.pathname).toLowerCase();
    if (/^\.(mp4|m4a|mp3|wav|aac|mov|webm)$/i.test(ext)) return ext;
  } catch {}
  return fallback;
}

async function fetchTranscriptUpstream(url, init, timeoutMs, label) {
  try {
    return await fetch(url, {
      ...init,
      signal: AbortSignal.timeout(timeoutMs)
    });
  } catch (error) {
    throw new Error(`${label}失败：${formatNetworkError(error)}`);
  }
}

async function fetchDouyinDetailForTranscript(input) {
  const supplied = findAwemeDetail(input.detail);
  if (supplied?.aweme_id && supplied.video) return supplied;

  const token = getVocToken();
  if (!token) {
    throw Object.assign(new Error('未配置 DOUYIN_API_TOKEN、VOC_TOKEN 或 VOC_SOCIAL_TOKEN，无法获取抖音视频详情。'), {
      status: 'needs_provider_config'
    });
  }

  const awemeId = cleanText(input.awemeId) || extractAwemeId(input.sourceUrl || input.url);
  if (!awemeId) {
    throw Object.assign(new Error('缺少 awemeId，无法获取视频详情。'), { status: 'needs_media' });
  }

  const url = new URL(`${DOUYIN_API_BASE_URL}/douyin/app/v3/fetch_one_video_v3`);
  url.searchParams.set('aweme_id', awemeId);
  const response = await fetchTranscriptUpstream(url.toString(), {
    method: 'GET',
    headers: {
      Accept: 'application/json',
      Authorization: bearerAuth(token)
    }
  }, 45000, '获取抖音视频详情');
  const data = await response.json().catch(() => ({}));
  if (!response.ok || data.success === false) {
    throw new Error(data.error?.message || data.error || data.message || data.mess || `抖音详情获取失败 HTTP ${response.status}`);
  }
  const detail = findAwemeDetail(data);
  if (!detail?.aweme_id) {
    throw Object.assign(new Error('抖音详情响应中未找到 aweme_detail。'), { status: 'needs_media' });
  }
  return detail;
}

async function downloadTranscriptMedia(candidate, job) {
  fs.mkdirSync(TRANSCRIPT_TEMP_DIR, { recursive: true });
  const ext = extensionFromUrl(candidate.url, candidate.kind === 'audio' ? '.m4a' : '.mp4');
  const filePath = path.join(TRANSCRIPT_TEMP_DIR, `${job.id}-source${ext}`);
  const { response } = await fetchRemoteVideoResponse([candidate.url], {
    Accept: '*/*',
    'User-Agent': 'Mozilla/5.0',
    Referer: 'https://www.douyin.com/',
    Origin: 'https://www.douyin.com'
  });
  await pipeline(Readable.fromWeb(response.body), fs.createWriteStream(filePath));
  return filePath;
}

function extractAudioForTranscript(inputPath, job) {
  return new Promise((resolve, reject) => {
    fs.mkdirSync(TRANSCRIPT_TEMP_DIR, { recursive: true });
    const outputPath = path.join(TRANSCRIPT_TEMP_DIR, `${job.id}.m4a`);
    const args = ['-y', '-i', inputPath, '-vn', '-c:a', 'aac', '-b:a', '64k', '-ar', '16000', '-ac', '1', outputPath];
    const proc = spawn('ffmpeg', args, { cwd: PROJECT_ROOT });
    let stderr = '';
    proc.stderr.on('data', data => { stderr += data.toString(); });
    proc.on('error', err => {
      reject(Object.assign(new Error(/ENOENT/i.test(err.message) ? '未检测到 ffmpeg，请先安装 ffmpeg 并加入 PATH。' : err.message), {
        status: 'needs_media_processing'
      }));
    });
    proc.on('close', code => {
      if (code !== 0 || !fs.existsSync(outputPath)) {
        const lastLine = stderr.split('\n').filter(Boolean).slice(-1)[0] || '';
        reject(Object.assign(new Error(`音频提取失败${lastLine ? `：${lastLine}` : ''}`), {
          status: 'needs_media_processing'
        }));
        return;
      }
      resolve(outputPath);
    });
  });
}

async function uploadTranscriptGateway(filePath, durationMs) {
  const token = getVocToken();
  if (!token) {
    throw Object.assign(new Error('未配置 VOC_TOKEN、TRANSCRIPTION_VOC_TOKEN 或 VOICE_TOKEN，无法调用转写网关。'), {
      status: 'needs_provider_config'
    });
  }
  if (!durationMs) {
    throw Object.assign(new Error('缺少音频时长 durationMs，无法提交转写网关。'), { status: 'needs_media' });
  }

  const buffer = fs.readFileSync(filePath);
  const form = new FormData();
  form.append('audio', new Blob([buffer], { type: 'audio/mp4' }), path.basename(filePath));
  form.append('durationMs', String(durationMs));
  form.append('roleType', '1');
  form.append('roleNum', '0');

  const response = await fetchTranscriptUpstream(`${TRANSCRIPTION_GATEWAY_BASE_URL}/upload`, {
    method: 'POST',
    headers: {
      Authorization: bearerAuth(token),
      Accept: 'application/json'
    },
    body: form
  }, 120000, '提交转写任务');
  const data = await response.json().catch(() => ({}));
  if (!response.ok || data.success === false) {
    throw new Error(data.error?.message || data.error || data.message || `转写上传失败 HTTP ${response.status}`);
  }
  const orderId = data.orderId || data.content?.orderId || data.data?.orderId || data.result?.orderId;
  if (!orderId) throw new Error('转写网关未返回 orderId。');
  return {
    orderId,
    estimateTime: Number(data.estimateTime || data.content?.estimateTime || data.data?.estimateTime || 0)
  };
}

async function queryTranscriptGateway(orderId) {
  const token = getVocToken();
  if (!token) {
    throw Object.assign(new Error('未配置 VOC_TOKEN、TRANSCRIPTION_VOC_TOKEN 或 VOICE_TOKEN，无法查询转写网关。'), {
      status: 'needs_provider_config'
    });
  }
  const response = await fetchTranscriptUpstream(`${TRANSCRIPTION_GATEWAY_BASE_URL}/result`, {
    method: 'POST',
    headers: {
      Authorization: bearerAuth(token),
      Accept: 'application/json',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ orderId })
  }, 45000, '查询转写结果');
  const data = await response.json().catch(() => ({}));
  if (!response.ok) {
    throw new Error(data.error?.message || data.error || data.message || `转写查询失败 HTTP ${response.status}`);
  }
  return data;
}

function gatewayValue(data, key) {
  return data?.[key] ?? data?.data?.[key] ?? data?.result?.[key] ?? data?.content?.[key];
}

function normalizeSegmentTime(value) {
  const number = Number(value);
  if (!Number.isFinite(number)) return null;
  return number > 1000 ? number / 1000 : number;
}

function normalizeTranscriptSegments(segments) {
  return (Array.isArray(segments) ? segments : []).map(segment => ({
    start: normalizeSegmentTime(segment.start ?? segment.begin ?? segment.bg),
    end: normalizeSegmentTime(segment.end ?? segment.ed),
    text: cleanText(segment.text || segment.onebest || segment.content)
  })).filter(segment => segment.text);
}

async function pollTranscriptJob(job) {
  if (!job.orderId || job.status === 'completed' || job.status === 'failed') return job;
  const data = await queryTranscriptGateway(job.orderId);
  const status = cleanText(gatewayValue(data, 'status')).toLowerCase();
  const text = cleanText(gatewayValue(data, 'text'));
  const segments = normalizeTranscriptSegments(gatewayValue(data, 'segments'));
  if (status === 'completed' || text || segments.length) {
    return updateTranscriptJob(job, {
      status: 'completed',
      stageLabel: '转写完成',
      progress: 100,
      text: text || segments.map(segment => segment.text).join('\n'),
      segments
    });
  }
  if (status === 'failed' || status === 'error') {
    return updateTranscriptJob(job, {
      status: 'failed',
      stageLabel: '转写失败',
      errorMessage: gatewayValue(data, 'error') || gatewayValue(data, 'message') || '转写网关返回失败'
    });
  }
  return updateTranscriptJob(job, {
    status: 'polling_provider',
    stageLabel: '转写处理中',
    progress: Math.max(Number(job.progress || 0), 85),
    warnings: [...new Set([...(job.warnings || []), '转写任务仍在处理中。'])]
  });
}

async function runTranscriptJob(job, input) {
  try {
    updateTranscriptJob(job, { status: 'resolving_detail', stageLabel: '正在获取视频详情', progress: 10 });
    const detail = await fetchDouyinDetailForTranscript(input);
    const awemeId = cleanText(detail.aweme_id || job.awemeId);
    if (awemeId && awemeId !== job.awemeId) updateTranscriptJob(job, { awemeId });

    updateTranscriptJob(job, { status: 'selecting_media', stageLabel: '正在选择可转写媒体', progress: 25 });
    const suppliedMediaUrl = cleanText(input.mediaUrl);
    const candidate = suppliedMediaUrl
      ? { url: suppliedMediaUrl, kind: /audio|m4a|mp3|aac/i.test(suppliedMediaUrl) ? 'audio' : 'video', keyPath: 'input.mediaUrl' }
      : selectMediaCandidate(detail);
    if (!candidate?.url) {
      updateTranscriptJob(job, {
        status: 'needs_media',
        stageLabel: '未找到可转写媒体',
        progress: 25,
        warnings: [...(job.warnings || []), '视频详情中未找到音频或视频下载地址。']
      });
      return;
    }

    updateTranscriptJob(job, {
      status: 'downloading_media',
      stageLabel: '正在下载媒体',
      progress: 45,
      mediaUrl: candidate.url,
      sourceKind: candidate.kind === 'audio' ? 'douyin_audio' : 'douyin_video'
    });
    const sourcePath = await downloadTranscriptMedia(candidate, job);
    updateTranscriptJob(job, { localVideoPath: sourcePath });

    const durationMs = Number(input.durationMs || durationFromDetail(detail) || 0);
    let audioPath = sourcePath;
    if (candidate.kind !== 'audio') {
      updateTranscriptJob(job, { status: 'extracting_audio', stageLabel: '正在提取音频', progress: 65 });
      audioPath = await extractAudioForTranscript(sourcePath, job);
    }

    updateTranscriptJob(job, {
      status: 'submitting_provider',
      stageLabel: '正在提交转写网关',
      progress: 80,
      localAudioPath: audioPath,
      durationMs
    });
    const uploaded = await uploadTranscriptGateway(audioPath, durationMs);
    updateTranscriptJob(job, {
      status: 'polling_provider',
      stageLabel: '转写任务已提交',
      progress: 85,
      orderId: uploaded.orderId,
      estimateTime: uploaded.estimateTime,
      warnings: [...(job.warnings || []), `已提交转写任务：${uploaded.orderId}`]
    });
  } catch (error) {
    updateTranscriptJob(job, {
      status: error.status || 'failed',
      stageLabel: '转写任务失败',
      errorMessage: error.message || '转写任务失败',
      warnings: [...(job.warnings || []), error.message || '转写任务失败']
    });
  }
}

app.post('/api/douyin/transcript/start', (req, res) => {
  const input = req.body || {};
  if (!cleanText(input.awemeId) && !cleanText(input.sourceUrl) && !cleanText(input.mediaUrl)) {
    return res.status(400).json({ success: false, error: '缺少 awemeId、sourceUrl 或 mediaUrl，无法创建转写任务。' });
  }
  const job = createTranscriptJob(input);
  updateTranscriptJob(job, {
    status: 'resolving_detail',
    stageLabel: '正在获取视频详情',
    progress: 5
  });
  res.json({ success: true, job: { ...job } });
  setImmediate(() => { void runTranscriptJob(job, input); });
});

app.get('/api/douyin/transcript/:jobId', async (req, res) => {
  const job = transcriptTasks.get(req.params.jobId);
  if (!job) {
    return res.status(404).json({ success: false, error: '未找到逐字稿任务。' });
  }
  try {
    if (job.status === 'polling_provider' && job.orderId) {
      await pollTranscriptJob(job);
    }
    res.json({ success: true, job: { ...job } });
  } catch (error) {
    updateTranscriptJob(job, {
      status: error.status || 'failed',
      stageLabel: '查询转写结果失败',
      errorMessage: error.message || '查询转写结果失败',
      warnings: [...(job.warnings || []), error.message || '查询转写结果失败']
    });
    res.json({ success: true, job: { ...job } });
  }
});

app.post('/api/douyin/transcript/:jobId/retry', (req, res) => {
  const previous = transcriptTasks.get(req.params.jobId);
  if (!previous) {
    return res.status(404).json({ success: false, error: '未找到逐字稿任务。' });
  }
  const body = req.body || {};
  const input = {
    ...body,
    awemeId: body.awemeId || previous.awemeId,
    analysisId: body.analysisId || previous.analysisId,
    mediaUrl: body.mediaUrl || previous.mediaUrl
  };
  const job = createTranscriptJob(input);
  updateTranscriptJob(job, {
    status: 'resolving_detail',
    stageLabel: '正在获取视频详情',
    progress: 5
  });
  res.json({ success: true, job: { ...job } });
  setImmediate(() => { void runTranscriptJob(job, input); });
});

// ==================== 健康检查 ====================

registerHealthRoutes(app, {
  fs,
  projectRoot: PROJECT_ROOT,
  manifestPath: MANIFEST_PATH,
  whisperDir: WHISPER_DIR,
  dataVideoDir: DATA_VIDEO_DIR,
  legacyVideoDir: LEGACY_VIDEO_DIR,
  transcriptTempDir: TRANSCRIPT_TEMP_DIR,
  transcriptTasks,
  douyinApiBaseUrl: DOUYIN_API_BASE_URL,
  transcriptionGatewayBaseUrl: TRANSCRIPTION_GATEWAY_BASE_URL,
  douyinGatewayMaxAttempts: DOUYIN_GATEWAY_MAX_ATTEMPTS,
  getVocToken
});

// ==================== 启动 ====================

app.listen(PORT, () => {
  printStartupLog({ port: PORT, projectRoot: PROJECT_ROOT });
});