/**
 * 云函数：douyinInsightManager（二阶段：爆款分析、选题池、日报）
 * 支持 action：
 *   analysisCreate | analysisList | analysisGet | analysisUpdate
 *   topicCreate | topicList | topicUpdate | topicArchive
 *   dailyReportCreate | dailyReportList | dailyReportGet
 *   transcriptStart | transcriptGet
 *
 * 说明：本函数只负责业务资产的持久化和账号隔离。抖音原始数据抓取仍由 12-douyinManager 负责。
 */
const PARSE_API_HOST = readEnv('PARSE_API_HOST') || 'https://server.fmode.cn';
const PARSE_APP_ID = readEnv('PARSE_APP_ID') || 'ncloudmaster';
const DOUYIN_API_BASE_URL = (readEnv('DOUYIN_API_BASE_URL') || readEnv('VOC_SOCIAL_BASE_URL') || 'https://server.fmode.cn/api/voc-social').replace(/\/+$/, '');
const IS_TIKHUB_DIRECT = /api\.tikhub\.io/i.test(DOUYIN_API_BASE_URL);
const LOCAL_VOC_TOKEN_FALLBACK = 'r:33c57d404c8fffc9b19199a4da0bb663';
const VOC_SOCIAL_TOKEN = readEnv('DOUYIN_API_TOKEN') || readEnv('VOC_TOKEN') || readEnv('TRANSCRIPTION_VOC_TOKEN') || readEnv('VOICE_TOKEN') || readEnv('OPENCLAW_VOC_TOKEN') || readEnv('VOC_SOCIAL_TOKEN') || LOCAL_VOC_TOKEN_FALLBACK;
const TIKHUB_TOKEN = readEnv('TIKHUB_TOKEN') || 'gqsZHfMWgAiMwV+ITbmZy0qALADWBZVS7QnV7kKJe9CwzgWgJG+7bwK+GQ==';
const DOUYIN_API_TOKEN = IS_TIKHUB_DIRECT ? (readEnv('DOUYIN_API_TOKEN') || TIKHUB_TOKEN) : VOC_SOCIAL_TOKEN;
const TRANSCRIPTION_GATEWAY = (readEnv('IFLYTEK_GATEWAY_BASE_URL') || 'https://server.fmode.cn/api/apig/transcription').replace(/\/+$/, '');
const TRANSCRIPTION_GATEWAY_TOKEN = readEnv('TRANSCRIPTION_VOC_TOKEN') || readEnv('VOICE_TOKEN') || readEnv('OPENCLAW_VOC_TOKEN') || readEnv('VOC_TOKEN') || readEnv('VOC_SOCIAL_TOKEN');
const {
  requireSession: requireParseSession,
  optionalSession,
  assertRequestedUserMatchesSession,
} = require('./_session');

async function handler(request, response) {
  try {
    const action = pickParam(request, 'action') || '';
    if (action === 'diagnose') {
      return diagnose(request, response);
    }

    await ensureTables();

    const session = await requireParseSession(request, Psql);
    assertRequestedUserMatchesSession(request, session);
    const requestedUserId = pickParam(request, 'userId') || '';
    if (requestedUserId && requestedUserId !== session.userId) {
      return response.json({ code: 403, success: false, error: '没有访问该账号数据的权限' });
    }
    const userId = session.userId;

    if (action === 'analysisCreate') return createRow(response, 'VideoflowViralAnalysis', userId, pickParam(request, 'analysis', 'data') || {});
    if (action === 'analysisList') return listRows(response, 'VideoflowViralAnalysis', userId, pickParam(request, 'limit') || 100);
    if (action === 'analysisGet') return getRow(response, 'VideoflowViralAnalysis', userId, pickParam(request, 'recordId', 'analysisId', 'id'));
    if (action === 'analysisUpdate') return updateRow(response, 'VideoflowViralAnalysis', userId, pickParam(request, 'recordId', 'analysisId', 'id'), pickParam(request, 'patch', 'analysis', 'data') || {});

    if (action === 'topicCreate') return createRow(response, 'VideoflowTopicIdea', userId, pickParam(request, 'topic', 'data') || {});
    if (action === 'topicList') return listRows(response, 'VideoflowTopicIdea', userId, pickParam(request, 'limit') || 500);
    if (action === 'topicUpdate') return updateRow(response, 'VideoflowTopicIdea', userId, pickParam(request, 'topicId', 'recordId', 'id'), pickParam(request, 'patch', 'topic', 'data') || {});
    if (action === 'topicArchive') return updateRow(response, 'VideoflowTopicIdea', userId, pickParam(request, 'topicId', 'recordId', 'id'), { status: 'archived' });

    if (action === 'dailyReportCreate') return createRow(response, 'VideoflowDailyReport', userId, pickParam(request, 'report', 'data') || {});
    if (action === 'dailyReportList') return listRows(response, 'VideoflowDailyReport', userId, pickParam(request, 'limit') || 100);
    if (action === 'dailyReportGet') return getRow(response, 'VideoflowDailyReport', userId, pickParam(request, 'reportId', 'recordId', 'id'));

    if (action === 'transcriptStart') return startTranscript(request, response, session);
    if (action === 'transcriptGet') return getTranscript(request, response, session);

    response.json({ code: 400, success: false, error: `未知 action: ${action}` });
  } catch (error) {
    console.error('douyinInsightManager failed:', error.message);
    response.json({ code: 500, success: false, error: error.message });
  }
}

async function ensureTables() {
  for (const table of ['VideoflowViralAnalysis', 'VideoflowTopicIdea', 'VideoflowDailyReport', 'VideoflowTranscriptJob']) {
    await Psql.query(`
      CREATE TABLE IF NOT EXISTS "${table}" (
        "objectId"  VARCHAR(50) PRIMARY KEY,
        "bizId"     VARCHAR(255) NOT NULL,
        "userId"    VARCHAR(255) NOT NULL,
        "data"      JSONB NOT NULL DEFAULT '{}',
        "status"    VARCHAR(50) DEFAULT '',
        "createdAt" TIMESTAMPTZ DEFAULT NOW(),
        "updatedAt" TIMESTAMPTZ DEFAULT NOW()
      )
    `);
    await Psql.query(`DROP INDEX IF EXISTS idx_${table.toLowerCase()}_biz`);
    await Psql.query(`CREATE UNIQUE INDEX IF NOT EXISTS idx_${table.toLowerCase()}_user_biz ON "${table}" ("userId", "bizId")`);
    await Psql.query(`CREATE INDEX IF NOT EXISTS idx_${table.toLowerCase()}_user ON "${table}" ("userId")`);
  }
}

async function createRow(response, table, userId, data) {
  const now = new Date().toISOString();
  const bizId = data.id || data.bizId || generateId();
  const merged = { ...data, id: bizId, userId, createdAt: data.createdAt || now, updatedAt: now };
  const existing = await Psql.query(
    `SELECT * FROM "${table}" WHERE "bizId"=$1 AND "userId"=$2 LIMIT 1`,
    [bizId, userId]
  );
  if (existing.length) {
    await Psql.query(
      `UPDATE "${table}" SET "data"=$1, "status"=$2, "updatedAt"=NOW() WHERE "bizId"=$3 AND "userId"=$4`,
      [JSON.stringify(merged), merged.status || '', bizId, userId]
    );
    return response.json({ code: 200, success: true, data: merged });
  }

  await Psql.query(
    `INSERT INTO "${table}" ("objectId","bizId","userId","data","status")
     VALUES ($1,$2,$3,$4,$5)`,
    [generateId(), bizId, userId, JSON.stringify(merged), merged.status || '']
  );
  response.json({ code: 200, success: true, data: merged });
}

async function listRows(response, table, userId, limit) {
  const parsedLimit = parseInt(limit || '100', 10);
  const safeLimit = Number.isFinite(parsedLimit) ? Math.min(Math.max(parsedLimit, 1), 1000) : 100;
  const rows = await Psql.query(
    `SELECT * FROM "${table}" WHERE "userId"=$1 ORDER BY "updatedAt" DESC LIMIT $2`,
    [userId, safeLimit]
  );
  response.json({ code: 200, success: true, data: rows.map(rowToObj) });
}

async function getRow(response, table, userId, id) {
  if (!id) return response.json({ code: 400, success: false, error: '缺少 id' });
  const rows = await Psql.query(
    `SELECT * FROM "${table}" WHERE "bizId"=$1 AND "userId"=$2 LIMIT 1`,
    [id, userId]
  );
  if (!rows.length) return response.json({ code: 404, success: false, error: '未找到记录' });
  response.json({ code: 200, success: true, data: rowToObj(rows[0]) });
}

async function updateRow(response, table, userId, id, patch) {
  if (!id) return response.json({ code: 400, success: false, error: '缺少 id' });
  const rows = await Psql.query(
    `SELECT * FROM "${table}" WHERE "bizId"=$1 AND "userId"=$2 LIMIT 1`,
    [id, userId]
  );
  if (!rows.length) return response.json({ code: 404, success: false, error: '未找到记录' });
  const merged = { ...rowToObj(rows[0]), ...patch, id, userId, updatedAt: new Date().toISOString() };
  await Psql.query(
    `UPDATE "${table}" SET "data"=$1, "status"=$2, "updatedAt"=NOW() WHERE "bizId"=$3 AND "userId"=$4`,
    [JSON.stringify(merged), merged.status || '', id, userId]
  );
  response.json({ code: 200, success: true, data: merged });
}

async function startTranscript(request, response, session) {
  const userId = session.userId;
  const transcriptionToken = transcriptionGatewayToken(session);
  const awemeId = clean(pickParam(request, 'awemeId'));
  const analysisId = clean(pickParam(request, 'analysisId'));
  if (!awemeId) return response.json({ code: 400, success: false, error: '缺少 awemeId' });

  const now = new Date().toISOString();
  const job = {
    id: `transcript_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`,
    awemeId,
    analysisId,
    provider: 'iflytek-gateway',
    status: 'pending',
    warnings: [],
    createdAt: now,
    updatedAt: now,
  };

  if (!transcriptionToken) {
    job.status = 'needs_provider_config';
    job.warnings.push('当前请求缺少可用于转写网关的登录态 token，请重新登录后再试。');
    await upsertTranscriptJob(userId, job);
    return response.json({ code: 200, success: true, data: job });
  }

  try {
    const detailResponse = await fetchDouyinDetail(awemeId);
    const detail = findAwemeDetail(detailResponse) || detailResponse;
    const media = selectMediaCandidate(detail, 'audio');
    if (!media.url) {
      job.status = 'needs_media';
      job.warnings.push('视频详情中未找到可直接提交转写的音频地址。');
      await upsertTranscriptJob(userId, job);
      return response.json({ code: 200, success: true, data: job });
    }

    const durationMs = media.durationMs || durationFromDetail(detail) || extractDurationMs(detail);
    if (!durationMs) {
      job.status = 'needs_media';
      job.warnings.push('未能确认音频时长，转写网关需要 durationMs。');
      await upsertTranscriptJob(userId, job);
      return response.json({ code: 200, success: true, data: job });
    }

    const uploaded = await uploadGatewayAudio(media.url, durationMs, transcriptionToken, {
      sourceKind: media.kind,
      keyPath: media.keyPath,
    });
    job.orderId = uploaded.orderId;
    job.estimateTime = uploaded.estimateTime || 0;
    job.mediaUrl = media.url;
    job.sourceKind = media.kind === 'audio' ? 'douyin_audio' : 'douyin_video';
    job.mediaKeyPath = media.keyPath;
    job.durationMs = durationMs;
    job.warnings.push(`已提交转写任务：${uploaded.orderId}`);
    if (media.keyPath) job.warnings.push(`媒体来源：${media.kind || 'media'} ${media.keyPath}`);
    await upsertTranscriptJob(userId, job);
    response.json({ code: 200, success: true, data: job });
  } catch (error) {
    job.status = 'failed';
    job.errorMessage = error.message || '提交逐字稿任务失败';
    job.warnings.push(job.errorMessage);
    await upsertTranscriptJob(userId, job);
    response.json({ code: 200, success: true, data: job });
  }
}

async function getTranscript(request, response, session) {
  const userId = session.userId;
  const transcriptionToken = transcriptionGatewayToken(session);
  const id = clean(pickParam(request, 'jobId', 'recordId', 'id'));
  if (!id) return response.json({ code: 400, success: false, error: '缺少 id' });
  const rows = await Psql.query(
    `SELECT * FROM "VideoflowTranscriptJob" WHERE "bizId"=$1 AND "userId"=$2 LIMIT 1`,
    [id, userId]
  );
  if (!rows.length) return response.json({ code: 404, success: false, error: '未找到逐字稿任务' });

  const job = rowToObj(rows[0]);
  if (!job.orderId || job.status === 'completed' || job.status === 'failed') {
    return response.json({ code: 200, success: true, data: job });
  }

  if (!transcriptionToken) {
    job.status = 'needs_provider_config';
    job.warnings = [...(job.warnings || []), '当前请求缺少可用于转写网关的登录态 token，请重新登录后再试。'];
    await upsertTranscriptJob(userId, job);
    return response.json({ code: 200, success: true, data: job });
  }

  try {
    const data = await queryGateway(job.orderId, transcriptionToken);
    const status = String(gatewayValue(data, 'status') || '').toLowerCase();
    const text = clean(gatewayValue(data, 'text'));
    const segments = normalizeGatewaySegments(gatewayValue(data, 'segments'));
    if (status === 'completed' || text) {
      job.status = 'completed';
      job.text = text || segments.map(s => s.text).join('\n');
      job.segments = segments;
    } else if (status === 'failed' || status === 'error') {
      job.status = 'failed';
      job.errorMessage = readGatewayError(data) || '转写失败';
      job.warnings = [...(job.warnings || []), job.errorMessage];
    } else {
      job.status = 'pending';
      job.warnings = [...new Set([...(job.warnings || []), '转写任务仍在处理中。'])];
    }
    job.updatedAt = new Date().toISOString();
    await upsertTranscriptJob(userId, job);
    response.json({ code: 200, success: true, data: job });
  } catch (error) {
    job.status = 'failed';
    job.errorMessage = error.message || '查询逐字稿任务失败';
    job.warnings = [...(job.warnings || []), job.errorMessage];
    job.updatedAt = new Date().toISOString();
    await upsertTranscriptJob(userId, job);
    response.json({ code: 200, success: true, data: job });
  }
}

async function upsertTranscriptJob(userId, job) {
  const existing = await Psql.query(
    `SELECT * FROM "VideoflowTranscriptJob" WHERE "bizId"=$1 AND "userId"=$2 LIMIT 1`,
    [job.id, userId]
  );
  if (existing.length) {
    await Psql.query(
      `UPDATE "VideoflowTranscriptJob" SET "data"=$1, "status"=$2, "updatedAt"=NOW() WHERE "bizId"=$3 AND "userId"=$4`,
      [JSON.stringify(job), job.status || '', job.id, userId]
    );
    return;
  }
  await Psql.query(
    `INSERT INTO "VideoflowTranscriptJob" ("objectId","bizId","userId","data","status")
     VALUES ($1,$2,$3,$4,$5)`,
    [generateId(), job.id, userId, JSON.stringify(job), job.status || '']
  );
}

function rowToObj(row) {
  const data = typeof row.data === 'string' ? JSON.parse(row.data) : (row.data || {});
  return { ...data, objectId: row.objectId, createdAt: row.createdAt, updatedAt: row.updatedAt };
}

async function fetchDouyinDetail(awemeId) {
  if (!DOUYIN_API_TOKEN) {
    throw new Error('抖音数据网关未配置有效 token：FMode voc-social 请配置 DOUYIN_API_TOKEN、VOC_TOKEN 或 VOC_SOCIAL_TOKEN；TikHub 直连才使用 TIKHUB_TOKEN。');
  }

  const url = new URL(`${DOUYIN_API_BASE_URL}${normalizeDouyinPath('/douyin/app/v3/fetch_one_video_v3')}`);
  url.searchParams.set('aweme_id', awemeId);
  let resp;
  try {
    resp = await fetch(url.toString(), {
      method: 'GET',
      headers: {
        'Accept': 'application/json',
        'Authorization': bearerAuth(DOUYIN_API_TOKEN),
      },
    });
  } catch (error) {
    throw new Error(`抖音数据网关网络请求失败：${formatFetchError(error)}。base=${maskBaseUrl(DOUYIN_API_BASE_URL)} route=/douyin/app/v3/fetch_one_video_v3`);
  }
  const data = await resp.json().catch(() => ({}));
  if (!resp.ok || data.success === false) throw new Error(readGatewayError(data) || `抖音详情获取失败 HTTP ${resp.status}`);
  return data;
}

async function diagnose(request, response) {
  const awemeId = String(pickParam(request, 'awemeId') || '7592116912205630761').trim();
  const result = {
    code: 200,
    success: true,
    data: {
      parseApiHost: PARSE_API_HOST,
      douyinBaseUrl: maskBaseUrl(DOUYIN_API_BASE_URL),
      isTikhubDirect: IS_TIKHUB_DIRECT,
      douyinTokenConfigured: !!DOUYIN_API_TOKEN,
      douyinTokenSource: douyinTokenSource(),
      transcriptTokenConfigured: !!TRANSCRIPTION_GATEWAY_TOKEN,
      transcriptTokenSource: transcriptTokenSource(TRANSCRIPTION_GATEWAY_TOKEN),
      transcriptUsesCurrentSession: true,
      transcriptionGateway: maskBaseUrl(TRANSCRIPTION_GATEWAY),
      probe: null,
    }
  };

  if (String(pickParam(request, 'probe') || '') === '1') {
    try {
      const detail = await fetchDouyinDetail(awemeId);
      result.data.probe = {
        code: detail?.code,
        success: detail?.success !== false,
        hasData: !!detail?.data,
        keys: detail && typeof detail === 'object' ? Object.keys(detail).slice(0, 10) : [],
      };
    } catch (error) {
      result.data.probe = {
        code: 502,
        success: false,
        error: error && error.message ? error.message : String(error || 'probe failed'),
      };
    }
  }

  if (String(pickParam(request, 'probeDb') || '') === '1') {
    try {
      await ensureTables();
      result.data.database = { success: true };
    } catch (error) {
      result.data.database = {
        success: false,
        error: error && error.message ? error.message : String(error || 'database probe failed'),
      };
    }
  }

  const sessionToken = clean(pickParam(request, 'sessionToken'));
  if (sessionToken) {
    try {
      const session = await optionalSession({ body: { sessionToken } }, Psql);
      result.data.session = {
        success: !!session?.userId,
        userId: session?.userId || '',
        source: 'parse-helper',
      };
    } catch (error) {
      result.data.session = {
        success: false,
        error: error && error.message ? error.message : String(error || 'session probe failed'),
      };
    }
  }

  return response.json(result);
}

function normalizeDouyinPath(path) {
  if (IS_TIKHUB_DIRECT && !path.startsWith('/api/v1/')) {
    return `/api/v1${path}`;
  }
  return path;
}

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_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;
  if (node.aweme_id && node.video) return node;
  for (const value of Object.values(node)) {
    const found = findAwemeDetail(value, depth + 1);
    if (found) return found;
  }
  return null;
}

function inferUrlKind(pathParts, url) {
  const joined = pathParts.join('.').toLowerCase();
  if (/cover|poster|image|thumb|avatar|sticker/.test(joined)) return 'image';
  if (/audio|mp4a|music|sound/.test(joined) || /media-audio|audio/.test(url)) return 'audio';
  if (/play_addr|download_addr|bit_rate|video|media-video/.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;

  Object.entries(node).forEach(([key, value]) => {
    const nextPath = [...pathParts, key];
    if (key === 'url_list' && Array.isArray(value)) {
      value.forEach((item, index) => {
        const url = decodeMaybeBase64Url(item);
        const kind = inferUrlKind(nextPath, url);
        if (url && kind !== 'image') {
          out.push({
            url,
            kind,
            keyPath: nextPath.join('.'),
            index,
            durationMs: durationFromDetail(node),
            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 = inferUrlKind(nextPath, url);
      if (url && kind !== 'image') {
        out.push({
          url,
          kind,
          keyPath: nextPath.join('.'),
          durationMs: durationFromDetail(node),
          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, preferred = 'audio') {
  const candidates = collectMediaCandidates(detail)
    .filter(item => ['audio', 'video'].includes(item.kind))
    .filter(item => isLikelyMediaUrl(item.url));
  const seen = new Set();
  const unique = candidates.filter(item => {
    if (seen.has(item.url)) return false;
    seen.add(item.url);
    return true;
  });
  unique.sort((a, b) => {
    const aPreferred = a.kind === preferred ? 0 : 1;
    const bPreferred = b.kind === preferred ? 0 : 1;
    if (aPreferred !== bPreferred) return aPreferred - bPreferred;
    const rank = item => {
      const keyPath = String(item.keyPath || '').toLowerCase();
      if (preferred === 'audio' && item.kind === 'audio') {
        if (keyPath.includes('video.dynamic_audio_list') || keyPath.includes('video.bit_rate_audio')) return 0;
        if (keyPath.includes('video.')) return 1;
        if (keyPath.includes('music.')) return 2;
      }
      if (item.kind === preferred) return 3;
      return 4;
    };
    const aRank = rank(a);
    const bRank = rank(b);
    if (aRank !== bRank) return aRank - bRank;
    const aSize = a.dataSize || Number.MAX_SAFE_INTEGER;
    const bSize = b.dataSize || Number.MAX_SAFE_INTEGER;
    if (aSize !== bSize) return aSize - bSize;
    return (a.bitRate || 0) - (b.bitRate || 0);
  });
  return unique[0] || { url: '', kind: '', keyPath: '', durationMs: durationFromDetail(detail) };
}

function isLikelyMediaUrl(value) {
  if (!/^https?:\/\//i.test(String(value || ''))) return false;
  try {
    const parsed = new URL(String(value));
    const pathName = parsed.pathname.toLowerCase();
    const host = parsed.hostname.toLowerCase();
    if (/\.(wav|mp3|m4a|aac|flac|ogg|oga|opus|pcm|mp4|mov|m4v|webm|mkv)$/i.test(pathName)) return true;
    if (host.includes('douyinvod.com')) return true;
    if (host.includes('amemv.com') && pathName.includes('/aweme/v1/play')) return true;
    const mime = parsed.searchParams.get('mime_type') || '';
    return /audio|video_mp4|video/.test(mime);
  } catch {
    return false;
  }
}

function decodeMaybeBase64Url(value) {
  const text = clean(value);
  if (!text) return '';
  if (/^https?:\/\//i.test(text)) return text;
  if (!/^[A-Za-z0-9+/=_-]+$/.test(text) || text.length < 24) return '';
  try {
    const decoded = atobCompatible(text.replace(/-/g, '+').replace(/_/g, '/'));
    return /^https?:\/\//i.test(decoded) ? decoded : '';
  } catch {
    return '';
  }
}

function atobCompatible(value) {
  if (typeof atob === 'function') return atob(value);
  if (typeof Buffer !== 'undefined') return Buffer.from(value, 'base64').toString('utf8');
  return '';
}

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 extractDurationMs(value) {
  const found = findFirstNumber(value, ['duration', 'duration_ms', 'durationMs', 'video_duration']);
  if (!found) return 0;
  return found > 1000 ? Math.round(found) : Math.round(found * 1000);
}

function findFirstNumber(value, keys, depth = 0) {
  if (!value || depth > 5) return 0;
  if (Array.isArray(value)) {
    for (const item of value) {
      const hit = findFirstNumber(item, keys, depth + 1);
      if (hit) return hit;
    }
    return 0;
  }
  if (typeof value !== 'object') return 0;
  for (const [key, raw] of Object.entries(value)) {
    if (keys.includes(key)) {
      const number = Number(raw);
      if (Number.isFinite(number) && number > 0) return number;
    }
    const hit = findFirstNumber(raw, keys, depth + 1);
    if (hit) return hit;
  }
  return 0;
}

async function uploadGatewayAudio(mediaUrl, durationMs, token, context = {}) {
  let mediaResp;
  try {
    mediaResp = await fetchWithTimeout(mediaUrl, {
      method: 'GET',
      headers: {
        Accept: '*/*',
        'User-Agent': 'Mozilla/5.0',
        Referer: 'https://www.douyin.com/',
        Origin: 'https://www.douyin.com',
      },
    }, 60000, '下载音频');
  } catch (error) {
    throw new Error(`音频下载网络失败：${formatFetchError(error)}`);
  }
  if (!mediaResp.ok) throw new Error(`音频下载失败 HTTP ${mediaResp.status}`);
  const contentType = mediaResp.headers?.get?.('content-type') || '';
  const arrayBuffer = await mediaResp.arrayBuffer();
  const mimeType = normalizeAudioMime(contentType, mediaUrl);
  const filename = `douyin-audio-${Date.now()}${extensionFromUrl(mediaUrl, mimeType)}`;
  const blob = new Blob([arrayBuffer], { type: mimeType });
  const form = new FormData();
  form.append('audio', blob, filename);
  form.append('durationMs', String(durationMs));
  form.append('roleType', readEnv('IFLYTEK_IST_ROLE_TYPE') || '1');
  form.append('roleNum', readEnv('IFLYTEK_IST_ROLE_NUM') || '0');
  if (readEnv('IFLYTEK_IST_LANGUAGE')) form.append('language', readEnv('IFLYTEK_IST_LANGUAGE'));
  if (readEnv('IFLYTEK_IST_PD')) form.append('pd', readEnv('IFLYTEK_IST_PD'));
  let resp;
  try {
    resp = await fetchWithTimeout(`${TRANSCRIPTION_GATEWAY}/upload`, {
      method: 'POST',
      headers: {
        Authorization: bearerAuth(token),
        Accept: 'application/json',
      },
      body: form,
    }, 300000, '转写网关上传');
  } catch (error) {
    const mediaSource = context.keyPath ? `，media=${context.sourceKind || 'media'}:${context.keyPath}` : '';
    throw new Error(`转写网关上传网络失败：${formatFetchError(error)}。gateway=${maskBaseUrl(TRANSCRIPTION_GATEWAY)}，tokenSource=${transcriptTokenSource(token)}，file=${filename}，size=${arrayBuffer.byteLength}${mediaSource}`);
  }
  const text = await resp.text();
  const data = parseJson(text) || { rawText: text };
  if (!resp.ok || data.success === false) throw new Error(readGatewayError(data) || `转写上传失败 HTTP ${resp.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 queryGateway(orderId, token) {
  let resp;
  try {
    resp = await fetchWithTimeout(`${TRANSCRIPTION_GATEWAY}/result`, {
      method: 'POST',
      headers: {
        Authorization: bearerAuth(token),
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ orderId }),
    }, 120000, '转写网关查询');
  } catch (error) {
    throw new Error(`转写网关查询网络失败：${formatFetchError(error)}。gateway=${maskBaseUrl(TRANSCRIPTION_GATEWAY)}，tokenSource=${transcriptTokenSource(token)}`);
  }
  const text = await resp.text();
  const data = parseJson(text) || { rawText: text };
  if (!resp.ok) throw new Error(readGatewayError(data) || `转写查询失败 HTTP ${resp.status}`);
  return data;
}

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

function readGatewayError(data) {
  const detail = data?.detail;
  if (detail === 'Not Found') return '抖音数据接口地址未找到，请检查 DOUYIN_API_BASE_URL 是否配置为 https://server.fmode.cn/api/voc-social';
  const type = clean(data?.type || data?.error?.type);
  const raw = data?.mess || data?.message || data?.msg || data?.error?.message || data?.error || detail || data?.rawText || '';
  const message = typeof raw === 'string'
    ? raw
    : raw && typeof raw === 'object'
      ? JSON.stringify(raw)
      : String(raw || '');
  if (/unauthorized/i.test(type) || /unauthorized/i.test(message)) {
    return '转写网关鉴权失败：请确认当前登录用户的 VOC/APIG 权限、余额和 session token 是否有效。';
  }
  if (/company或用户信息不存在/.test(String(message))) {
    return '当前抖音数据网关 token 未绑定有效用户或公司，请在云函数配置 DOUYIN_API_TOKEN/VOC_TOKEN/VOC_SOCIAL_TOKEN，不能使用 TikHub token。';
  }
  return message;
}

function normalizeGatewaySegments(segments) {
  const arr = Array.isArray(segments) ? segments : [];
  return arr.map(segment => ({
    start: normalizeTime(segment.start ?? segment.begin ?? segment.bg),
    end: normalizeTime(segment.end ?? segment.ed),
    text: clean(segment.text || segment.onebest || segment.content),
  })).filter(segment => segment.text);
}

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

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

async function fetchWithTimeout(url, init, timeoutMs, label) {
  const controller = typeof AbortController !== 'undefined' ? new AbortController() : null;
  const timer = controller ? setTimeout(() => controller.abort(), timeoutMs) : null;
  try {
    return await fetch(url, {
      ...init,
      signal: controller ? controller.signal : init?.signal,
    });
  } catch (error) {
    if (error && error.name === 'AbortError') {
      throw new Error(`${label || '请求'}超时（${timeoutMs}ms）`);
    }
    throw error;
  } finally {
    if (timer) clearTimeout(timer);
  }
}

function normalizeAudioMime(contentType, url) {
  const value = clean(contentType).split(';')[0].toLowerCase();
  if (/^audio\//.test(value) || value === 'video/mp4') return value;
  const pathname = (() => {
    try { return new URL(url).pathname.toLowerCase(); } catch { return String(url || '').toLowerCase(); }
  })();
  if (pathname.endsWith('.mp3')) return 'audio/mpeg';
  if (pathname.endsWith('.wav')) return 'audio/wav';
  if (pathname.endsWith('.aac')) return 'audio/aac';
  if (pathname.endsWith('.m4a')) return 'audio/mp4';
  return 'audio/mp4';
}

function extensionFromUrl(url, mimeType) {
  try {
    const ext = new URL(url).pathname.match(/\.(mp3|m4a|aac|wav|mp4|mov|webm)$/i)?.[0];
    if (ext) return ext.toLowerCase();
  } catch {}
  const mime = clean(mimeType).toLowerCase();
  if (mime.includes('mpeg')) return '.mp3';
  if (mime.includes('wav')) return '.wav';
  if (mime.includes('aac')) return '.aac';
  return '.m4a';
}

function douyinTokenSource() {
  if (readEnv('DOUYIN_API_TOKEN')) return 'DOUYIN_API_TOKEN';
  if (readEnv('VOC_TOKEN')) return 'VOC_TOKEN';
  if (readEnv('TRANSCRIPTION_VOC_TOKEN')) return 'TRANSCRIPTION_VOC_TOKEN';
  if (readEnv('VOICE_TOKEN')) return 'VOICE_TOKEN';
  if (readEnv('OPENCLAW_VOC_TOKEN')) return 'OPENCLAW_VOC_TOKEN';
  if (readEnv('VOC_SOCIAL_TOKEN')) return 'VOC_SOCIAL_TOKEN';
  if (IS_TIKHUB_DIRECT && readEnv('TIKHUB_TOKEN')) return 'TIKHUB_TOKEN';
  if (!IS_TIKHUB_DIRECT && LOCAL_VOC_TOKEN_FALLBACK) return 'LOCAL_VOC_TOKEN_FALLBACK';
  return IS_TIKHUB_DIRECT ? 'TIKHUB_TOKEN_FALLBACK' : '';
}

function transcriptionGatewayToken(session) {
  return clean(session?.sessionToken) || clean(TRANSCRIPTION_GATEWAY_TOKEN);
}

function transcriptTokenSource(token) {
  if (token && clean(token).startsWith('r:')) return 'current_user_sessionToken';
  if (readEnv('TRANSCRIPTION_VOC_TOKEN')) return 'TRANSCRIPTION_VOC_TOKEN';
  if (readEnv('VOICE_TOKEN')) return 'VOICE_TOKEN';
  if (readEnv('OPENCLAW_VOC_TOKEN')) return 'OPENCLAW_VOC_TOKEN';
  if (readEnv('VOC_TOKEN')) return 'VOC_TOKEN';
  if (readEnv('VOC_SOCIAL_TOKEN')) return 'VOC_SOCIAL_TOKEN';
  if (clean(token)) return 'TRANSCRIPTION_GATEWAY_TOKEN';
  return '';
}

function parseJson(text) {
  try {
    return text ? JSON.parse(text) : null;
  } catch {
    return null;
  }
}

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

function maskBaseUrl(value) {
  return String(value || '').replace(/(token=)[^&]+/ig, '$1***');
}

function pickParam(request, ...names) {
  const sources = [request.params, request.body, request];
  for (const src of sources) {
    if (!src || typeof src !== 'object') continue;
    for (const name of names) {
      const value = src[name];
      if (value !== undefined && value !== null && value !== '') return value;
    }
  }
  return null;
}

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

function generateId() {
  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  let s = '';
  for (let i = 0; i < 10; i++) s += chars.charAt(Math.floor(Math.random() * chars.length));
  return s;
}

function readEnv(name) {
  if (typeof process !== 'undefined' && process.env && process.env[name]) {
    return process.env[name];
  }
  return '';
}

if (typeof module !== 'undefined' && module.exports && readEnv('NODE_ENV') === 'test') {
  module.exports = {
    __test: {
      findAwemeDetail,
      selectMediaCandidate,
      decodeMaybeBase64Url,
      durationFromDetail,
      transcriptionGatewayToken,
      transcriptTokenSource,
      readGatewayError,
    },
  };
}