const fs = require('fs');
const path = require('path');
const { okResult, errorResult } = require('../core/result-envelope');
const { createRunDir, latestPath, outputsRoot, writeRunManifest } = require('../core/output-paths');
const { recordGroupSync, recordCustomersFromGroups } = require('../core/dashboard-state');
const {
  buildContext,
  gatewayCall,
  requireGuid,
  assertMethodsInCatalog,
  safeResult
} = require('../core/shared-gateway');

const REQUIRED_METHODS = {
  getRoomList: '/room/getRoomList',
  batchGetRoomDetail: '/room/batchGetRoomDetail',
  syncMsg: '/msg/syncMsg',
  getSessionPage: '/session/getSessionPage'
};

const DEFAULT_KEYWORD_CONFIG = {
  matchMode: 'threshold',
  threshold: 2,
  highConfidenceTerms: ['客户群', '服务群'],
  keywords: [
    '客户群', '服务群', '售后群', '咨询群', 'VIP群', '专属群',
    '业主群', '项目群', '订单群', '用户群', '粉丝群', '会员群',
    '客户', '服务', '售后', '咨询'
  ]
};

function decodeRoomName(raw) {
  if (!raw) return '';
  try {
    const decoded = Buffer.from(raw, 'base64').toString('utf8');
    if (decoded && /[一-龥]/.test(decoded)) return decoded;
  } catch {
    // ignore
  }
  return raw;
}

function groupsDir() {
  return path.join(outputsRoot(), 'groups');
}

function messagesDir() {
  return path.join(outputsRoot(), 'messages');
}

function roomMessagesDir(roomId) {
  return path.join(messagesDir(), roomId);
}

function ensureGroupsDir() {
  fs.mkdirSync(groupsDir(), { recursive: true });
}

function ensureMessagesDir() {
  fs.mkdirSync(messagesDir(), { recursive: true });
}

function ensureRoomMessagesDir(roomId) {
  return fs.mkdirSync(roomMessagesDir(roomId), { recursive: true });
}

function messageFilePath(roomId, seq, msgUniqueId) {
  ensureRoomMessagesDir(roomId);
  const safeUniqueId = String(msgUniqueId || '').replace(/[^a-zA-Z0-9_-]/g, '_').slice(0, 80);
  return path.join(roomMessagesDir(roomId), `${seq}-${safeUniqueId}.json`);
}

let gbkEncodeMap = null;

function getGbkEncodeMap() {
  if (gbkEncodeMap) return gbkEncodeMap;
  gbkEncodeMap = new Map();
  const decoder = new TextDecoder('gbk');
  for (let first = 0x81; first <= 0xfe; first++) {
    for (let second = 0x40; second <= 0xfe; second++) {
      if (second === 0x7f) continue;
      const bytes = Buffer.from([first, second]);
      const char = decoder.decode(bytes);
      if (!char || char === '\uFFFD' || char.length !== 1) continue;
      if (!gbkEncodeMap.has(char)) gbkEncodeMap.set(char, bytes);
    }
  }
  return gbkEncodeMap;
}

function repairUtf8DecodedAsGbk(value) {
  const text = String(value || '');
  if (!/[\u4e00-\u9fa5]/.test(text)) return text;
  const map = getGbkEncodeMap();
  const chunks = [];
  for (const char of text) {
    const code = char.codePointAt(0);
    if (code <= 0x7f) {
      chunks.push(Buffer.from([code]));
      continue;
    }
    const bytes = map.get(char);
    if (!bytes) return text;
    chunks.push(bytes);
  }
  const repaired = Buffer.concat(chunks).toString('utf8');
  if (repaired.includes('\uFFFD')) return text;
  return /[\u4e00-\u9fa5]/.test(repaired) ? repaired : text;
}

function cleanExtractedText(value) {
  const cleaned = String(value || '').replace(/[\u0000-\u001f\u007f]/g, '').trim();
  return repairUtf8DecodedAsGbk(cleaned);
}

function extractUtf8TextFromBase64(value) {
  if (!value) return '';
  let buffer;
  try {
    buffer = Buffer.from(String(value), 'base64');
  } catch {
    return '';
  }
  const candidates = [];
  for (let i = 0; i < buffer.length - 1; i++) {
    const len = buffer[i];
    if (!len || len > 240 || i + 1 + len > buffer.length) continue;
    const text = cleanExtractedText(buffer.slice(i + 1, i + 1 + len).toString('utf8'));
    if (!text || text.includes('\uFFFD')) continue;
    if (/[\u4e00-\u9fa5]/.test(text)) candidates.push(text);
  }
  return candidates.sort((a, b) => b.length - a.length)[0] || '';
}

function extractMessageContent(msg = {}) {
  const rawText = extractUtf8TextFromBase64(msg.base64RawData || msg.msgData?.extras?.base64RawData);
  if (rawText) return rawText;
  if (typeof msg.content === 'string' && msg.content) return cleanExtractedText(msg.content);
  if (typeof msg.msgContent === 'string' && msg.msgContent) return cleanExtractedText(msg.msgContent);
  if (msg.msgData) {
    if (typeof msg.msgData.content === 'string' && msg.msgData.content) return cleanExtractedText(msg.msgData.content);
    if (typeof msg.msgData.text === 'string' && msg.msgData.text) return cleanExtractedText(msg.msgData.text);
    if (Array.isArray(msg.msgData.moreDetail)) {
      return cleanExtractedText(msg.msgData.moreDetail.map(item => item && item.text).filter(Boolean).join(''));
    }
    if (typeof msg.msgData.notifyTitle === 'string' && msg.msgData.notifyTitle) return cleanExtractedText(msg.msgData.notifyTitle);
  }
  return '';
}

function appendWebhookMessage(roomId, message) {
  if (!roomId || !message) return null;
  const seq = Number(message.seq) || 0;
  const msgUniqueId = message.msgUniqueIdentifier || message.msgId || `${seq}`;
  const filePath = messageFilePath(roomId, seq, msgUniqueId);
  if (fs.existsSync(filePath)) {
    const existing = safeReadJson(filePath, null);
    if (!existing) return null;
    const merged = {
      ...existing,
      content: existing.content || message.content || '',
      rawData: existing.rawData || message.rawData,
      fromRoomId: existing.fromRoomId || message.fromRoomId,
      receiverId: existing.receiverId || message.receiverId || ''
    };
    const improved = (!existing.content && merged.content) || (!existing.rawData && merged.rawData);
    if (!improved) return null;
    fs.writeFileSync(filePath, JSON.stringify(merged, null, 2), 'utf8');
    return filePath;
  }
  fs.writeFileSync(filePath, JSON.stringify(message, null, 2), 'utf8');
  return filePath;
}

function messageExists(roomId, msgUniqueId) {
  if (!roomId || !msgUniqueId) return false;
  const dir = roomMessagesDir(roomId);
  if (!fs.existsSync(dir)) return false;
  const safeUniqueId = String(msgUniqueId).replace(/[^a-zA-Z0-9_-]/g, '_').slice(0, 80);
  const files = fs.readdirSync(dir);
  return files.some(f => f.endsWith(`-${safeUniqueId}.json`));
}

function listRoomMessageFiles(roomId) {
  const dir = roomMessagesDir(roomId);
  if (!fs.existsSync(dir)) return [];
  return fs.readdirSync(dir)
    .filter(f => f.endsWith('.json'))
    .map(f => ({ name: f, path: path.join(dir, f), mtime: fs.statSync(path.join(dir, f)).mtime }))
    .sort((a, b) => a.name.localeCompare(b.name));
}

function readRoomMessages(roomId) {
  const files = listRoomMessageFiles(roomId);
  const messages = [];
  for (const file of files) {
    try {
      const msg = JSON.parse(fs.readFileSync(file.path, 'utf8'));
      messages.push(msg);
    } catch {
      // ignore
    }
  }
  return messages;
}

function safeReadJson(filePath, fallback) {
  if (!filePath || !fs.existsSync(filePath)) return fallback;
  try {
    return JSON.parse(fs.readFileSync(filePath, 'utf8'));
  } catch {
    return fallback;
  }
}

function customerKeywordsPath() {
  return path.join(groupsDir(), 'customer-keywords.json');
}

function loadCustomerKeywords() {
  const stored = safeReadJson(customerKeywordsPath(), null);
  if (!stored || !stored.config) return { ...DEFAULT_KEYWORD_CONFIG };
  return {
    matchMode: stored.config.matchMode === 'any' ? 'any' : 'threshold',
    threshold: Math.max(1, Number(stored.config.threshold) || DEFAULT_KEYWORD_CONFIG.threshold),
    highConfidenceTerms: Array.isArray(stored.config.highConfidenceTerms)
      ? stored.config.highConfidenceTerms
      : DEFAULT_KEYWORD_CONFIG.highConfidenceTerms,
    keywords: Array.isArray(stored.config.keywords)
      ? stored.config.keywords
      : DEFAULT_KEYWORD_CONFIG.keywords
  };
}

function saveCustomerKeywords(config) {
  ensureGroupsDir();
  const payload = {
    version: '1.0',
    updatedAt: new Date().toISOString(),
    config: {
      matchMode: config.matchMode === 'any' ? 'any' : 'threshold',
      threshold: Math.max(1, Number(config.threshold) || DEFAULT_KEYWORD_CONFIG.threshold),
      highConfidenceTerms: Array.isArray(config.highConfidenceTerms)
        ? config.highConfidenceTerms
        : DEFAULT_KEYWORD_CONFIG.highConfidenceTerms,
      keywords: Array.isArray(config.keywords)
        ? config.keywords
        : DEFAULT_KEYWORD_CONFIG.keywords
    }
  };
  fs.writeFileSync(customerKeywordsPath(), JSON.stringify(payload, null, 2), 'utf8');
  return payload.config;
}

function buildClassifierConfig(input = {}) {
  const persisted = loadCustomerKeywords();
  const matchMode = input.matchMode === 'any' || input.matchMode === 'threshold'
    ? input.matchMode
    : persisted.matchMode;
  const threshold = Math.max(1, Number(input.threshold || persisted.threshold) || 1);

  return {
    keywords: Array.isArray(input.customerKeywords) && input.customerKeywords.length
      ? input.customerKeywords
      : persisted.keywords,
    highConfidenceTerms: Array.isArray(input.highConfidenceTerms) && input.highConfidenceTerms.length
      ? input.highConfidenceTerms
      : persisted.highConfidenceTerms,
    matchMode,
    threshold
  };
}

function normalizeMatchResult(classification) {
  return {
    isCustomerGroup: Boolean(classification.isCustomerGroup),
    reviewStatus: classification.reviewStatus || 'IMPORTED',
    confidence: typeof classification.confidence === 'number' ? classification.confidence : 0,
    reason: classification.reason || '',
    matchedKeywords: Array.isArray(classification.matchedKeywords) ? classification.matchedKeywords : []
  };
}

function classifyGroupByName(roomName, classifierConfig = buildClassifierConfig()) {
  const text = String(roomName || '');
  const { keywords, highConfidenceTerms, matchMode, threshold } = classifierConfig;

  const highMatched = [...new Set((highConfidenceTerms || []).filter(kw => text.includes(kw)))];
  if (highMatched.length > 0) {
    return normalizeMatchResult({
      isCustomerGroup: true,
      reviewStatus: 'AUTO_CONFIRMED',
      confidence: 1.0,
      reason: `高置信命中：${highMatched.slice(0, 5).join('、')}`,
      matchedKeywords: highMatched
    });
  }

  const matched = [...new Set((keywords || []).filter(kw => text.includes(kw)))];
  const hitCount = matched.length;

  if (matchMode === 'any') {
    if (hitCount > 0) {
      return normalizeMatchResult({
        isCustomerGroup: true,
        reviewStatus: 'AUTO_CONFIRMED',
        confidence: 0.8,
        reason: `命中关键词：${matched.slice(0, 5).join('、')}`,
        matchedKeywords: matched
      });
    }
  } else if (hitCount >= threshold) {
    return normalizeMatchResult({
      isCustomerGroup: true,
      reviewStatus: 'AUTO_CONFIRMED',
      confidence: Math.min(0.95, 0.5 + 0.12 * hitCount),
      reason: `命中 ${hitCount} 个关键词（阈值 ${threshold}）`,
      matchedKeywords: matched
    });
  } else if (hitCount > 0) {
    return normalizeMatchResult({
      isCustomerGroup: true,
      reviewStatus: 'SUGGESTED',
      confidence: 0.35,
      reason: `仅命中 ${hitCount} 个弱关键词，建议人工确认`,
      matchedKeywords: matched
    });
  }

  return normalizeMatchResult({
    isCustomerGroup: false,
    reviewStatus: 'IMPORTED',
    confidence: 0,
    reason: '未命中客户群关键词',
    matchedKeywords: []
  });
}

function createRoomRecord(raw, source) {
  const members = Array.isArray(raw.roomMemberList)
    ? raw.roomMemberList
    : Array.isArray(raw.memberList)
      ? raw.memberList
      : Array.isArray(raw.members)
        ? raw.members
        : [];
  return {
    roomId: String(raw.roomId || ''),
    roomName: decodeRoomName(raw.roomName || raw.sessionName || ''),
    memberCount: Number(raw.roomMemberCount) || 0,
    roomHeadimgUrl: raw.roomHeadimgUrl || raw.roomAvatarUrl || undefined,
    roomExtType: raw.roomExtType !== undefined ? Number(raw.roomExtType) : undefined,
    members: members.map(m => ({
      userId: String(m.userId || m.wxId || m.id || ''),
      userName: String(m.userName || m.nickname || m.name || ''),
      type: Number(m.userType || m.type || m.memberType || 0)
    })),
    source,
    sources: [source],
    seenAt: new Date().toISOString()
  };
}

function dedupRooms(rooms) {
  const map = new Map();
  for (const room of rooms) {
    if (!room.roomId) continue;
    const existing = map.get(room.roomId);
    if (!existing) {
      map.set(room.roomId, room);
    } else {
      existing.sources = [...new Set([...existing.sources, ...room.sources])];
      existing.source = existing.sources.join(',');
      if (room.roomName && room.roomName !== existing.roomName) {
        existing.roomName = room.roomName;
      }
      if (room.memberCount && room.memberCount > existing.memberCount) {
        existing.memberCount = room.memberCount;
      }
      if (room.roomHeadimgUrl && !existing.roomHeadimgUrl) {
        existing.roomHeadimgUrl = room.roomHeadimgUrl;
      }
      if (room.roomExtType !== undefined && existing.roomExtType === undefined) {
        existing.roomExtType = room.roomExtType;
      }
      if (room.seenAt && (!existing.seenAt || room.seenAt > existing.seenAt)) {
        existing.seenAt = room.seenAt;
      }
      if (Array.isArray(room.members) && room.members.length > (existing.members?.length || 0)) {
        existing.members = room.members;
      }
    }
  }
  return Array.from(map.values());
}

function isExternalRoom(room, includeInternalGroups = false) {
  if (includeInternalGroups) return true;
  return room.roomExtType === undefined || room.roomExtType === 2;
}

async function scanRoomsFromRoomList(ctx, maxPages = 100) {
  assertMethodsInCatalog({ getRoomList: REQUIRED_METHODS.getRoomList });
  const rooms = [];
  let nextStartIndex = 0;
  let hasMore = true;
  let pages = 0;

  while (hasMore && pages < maxPages) {
    pages++;
    const data = await gatewayCall(ctx, REQUIRED_METHODS.getRoomList, {
      guid: ctx.guid,
      nextStartIndex
    });
    const roomList = Array.isArray(data && data.roomList) ? data.roomList : [];
    for (const room of roomList) {
      rooms.push(createRoomRecord(room, 'roomList'));
    }
    hasMore = data.hasMore === 1 || data.hasMore === true;
    nextStartIndex = data.nextStartIndex ?? -1;
    if (!roomList.length || nextStartIndex < 0) break;
  }

  return { rooms, pages };
}

function extractRoomIdFromSession(session) {
  if (!session) return '';
  return String(session.roomId || session.sessionId || session.fromRoomId || session.id || '');
}

function isGroupSession(session) {
  if (!session) return false;
  if (session.sessionType === 1 || session.chatType === 2 || session.isGroup === true) return true;
  return false;
}

async function scanRoomsFromSessions(ctx, maxPages = 100) {
  assertMethodsInCatalog({ getSessionPage: REQUIRED_METHODS.getSessionPage });
  const rooms = [];
  let currentSeq = 0;
  let hasMore = true;
  let pages = 0;

  while (hasMore && pages < maxPages) {
    pages++;
    const data = await gatewayCall(ctx, REQUIRED_METHODS.getSessionPage, {
      guid: ctx.guid,
      sessionType: 1,
      currentSeq
    });
    const sessionList = Array.isArray(data && data.sessionList)
      ? data.sessionList
      : Array.isArray(data && data.list)
        ? data.list
        : [];

    for (const session of sessionList) {
      const roomId = extractRoomIdFromSession(session);
      if (!roomId || !isGroupSession(session)) continue;
      const roomName = decodeRoomName(session.sessionName || session.roomName || '');
      if (!roomName) continue; // 跳过无名称的会话（通常是单聊或系统通知）
      rooms.push({
        roomId,
        roomName,
        memberCount: Number(session.roomMemberCount || session.memberCount) || 0,
        roomHeadimgUrl: session.roomHeadimgUrl || session.sessionAvatar || undefined,
        roomExtType: session.roomExtType !== undefined ? Number(session.roomExtType) : undefined,
        source: 'session',
        sources: ['session'],
        seenAt: new Date().toISOString()
      });
    }

    hasMore = data.hasMore === 1 || data.hasMore === true;
    currentSeq = data.currentSeq ?? -1;
    if (!sessionList.length || currentSeq < 0) break;
  }

  return { rooms, pages };
}

async function enrichRoomsWithDetails(ctx, roomIds, chunkSize = 50) {
  if (!roomIds.length) return [];
  assertMethodsInCatalog({ batchGetRoomDetail: REQUIRED_METHODS.batchGetRoomDetail });
  const rooms = [];
  for (let i = 0; i < roomIds.length; i += chunkSize) {
    const chunk = roomIds.slice(i, i + chunkSize);
    const data = await gatewayCall(ctx, REQUIRED_METHODS.batchGetRoomDetail, {
      guid: ctx.guid,
      roomIdList: chunk
    });
    const roomList = Array.isArray(data && data.roomList) ? data.roomList : [];
    for (const room of roomList) {
      rooms.push(createRoomRecord(room, 'messages'));
    }
  }
  return rooms;
}

async function scanRoomsFromMessages(ctx, maxPages = 300, maxTotalMessages = 20000) {
  assertMethodsInCatalog({ syncMsg: REQUIRED_METHODS.syncMsg });
  const roomIds = new Set();
  let msgSeq = 0;
  let hasMore = true;
  let pages = 0;
  let totalMessages = 0;

  while (hasMore && pages < maxPages && totalMessages < maxTotalMessages) {
    pages++;
    const data = await gatewayCall(ctx, REQUIRED_METHODS.syncMsg, {
      guid: ctx.guid,
      msgSeq,
      limit: 500
    });
    const msgList = Array.isArray(data && data.syncMsgList) ? data.syncMsgList : [];
    hasMore = Boolean(data.hasMore);
    msgSeq = data.travelSyncKey ?? msgSeq + 1;
    totalMessages += msgList.length;

    for (const msg of msgList) {
      const roomId = String(msg.fromRoomId || '');
      if (roomId) roomIds.add(roomId);
    }

    if (!msgList.length) break;
  }

  const roomIdList = Array.from(roomIds);
  const details = await enrichRoomsWithDetails(ctx, roomIdList, 50);
  return { rooms: details, pages, rawRoomIds: roomIdList, totalMessages };
}

function listGroupFiles() {
  ensureGroupsDir();
  const files = fs.readdirSync(groupsDir())
    .filter(f => /^rooms-\d{4}-\d{2}-\d{2}T\d{2}-\d{2}-\d{2}\.json$/.test(f))
    .map(f => ({ name: f, path: path.join(groupsDir(), f), mtime: fs.statSync(path.join(groupsDir(), f)).mtime }))
    .sort((a, b) => b.mtime - a.mtime);
  return files;
}

function readLatestRooms() {
  return safeReadJson(latestPath('groups', 'rooms-latest.json'), []);
}

function confirmedMappingPath() {
  ensureGroupsDir();
  return path.join(groupsDir(), 'confirmed-mapping.json');
}

function readConfirmedMapping() {
  return safeReadJson(confirmedMappingPath(), {});
}

function writeConfirmedMapping(mapping) {
  ensureGroupsDir();
  fs.writeFileSync(confirmedMappingPath(), JSON.stringify(mapping, null, 2), 'utf8');
}

function rejectedMappingPath() {
  ensureGroupsDir();
  return path.join(groupsDir(), 'rejected-mapping.json');
}

function readRejectedMapping() {
  return safeReadJson(rejectedMappingPath(), {});
}

function writeRejectedMapping(mapping) {
  ensureGroupsDir();
  fs.writeFileSync(rejectedMappingPath(), JSON.stringify(mapping, null, 2), 'utf8');
}

function resolveScope(input) {
  const validScopes = ['self', 'session', 'messages', 'all'];
  if (input.scope && validScopes.includes(input.scope)) return input.scope;
  if (input.fromMessages === true) return 'messages';
  return 'all';
}

function timestampFileName() {
  return `rooms-${new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19)}.json`;
}

function countBySource(rooms) {
  return rooms.reduce((acc, room) => {
    for (const s of room.sources || [room.source]) {
      acc[s] = (acc[s] || 0) + 1;
    }
    return acc;
  }, {});
}

const qiweiSyncExternalGroups = safeResult(async function qiweiSyncExternalGroups(input = {}) {
  assertMethodsInCatalog({
    getRoomList: REQUIRED_METHODS.getRoomList,
    batchGetRoomDetail: REQUIRED_METHODS.batchGetRoomDetail,
    getSessionPage: REQUIRED_METHODS.getSessionPage,
    syncMsg: REQUIRED_METHODS.syncMsg
  });
  const ctx = buildContext(input);
  requireGuid(ctx);

  const scope = resolveScope(input);
  const maxPages = Math.max(1, Math.min(300, Number(input.maxPages || 100)));
  const includeInternalGroups = input.includeInternalGroups === true;
  const autoClassify = input.autoClassify !== false;
  const scanFromMessages = input.scanFromMessages === true;
  const previewMessages = Math.max(0, Math.min(100, Number(input.previewMessages || 0)));
  const previewOnlyForUnsure = input.previewOnlyForUnsure !== false;
  const classifier = buildClassifierConfig(input);

  const collected = [];
  const perSource = { roomList: { rooms: [], pages: 0 }, session: { rooms: [], pages: 0 }, messages: { rooms: [], pages: 0, totalMessages: 0 } };

  if (scope === 'self' || scope === 'all') {
    try {
      const result = await scanRoomsFromRoomList(ctx, maxPages);
      perSource.roomList = result;
      collected.push(...result.rooms);
    } catch (err) {
      // 继续其他来源
    }
  }

  if (scope === 'session' || scope === 'all') {
    try {
      const result = await scanRoomsFromSessions(ctx, maxPages);
      perSource.session = result;
      collected.push(...result.rooms);
    } catch (err) {
      // 继续其他来源
    }
  }

  if (scope === 'messages' || (scope === 'all' && scanFromMessages)) {
    try {
      const result = await scanRoomsFromMessages(ctx, maxPages);
      perSource.messages = result;
      collected.push(...result.rooms);
    } catch (err) {
      // 继续其他来源
    }
  }

  const deduped = dedupRooms(collected);
  const roomsNeedingDetails = deduped
    .filter(r => Number(r.memberCount || 0) > 0 && (!Array.isArray(r.members) || !r.members.length))
    .map(r => r.roomId)
    .filter(Boolean);

  if (roomsNeedingDetails.length) {
    try {
      const detailRooms = await enrichRoomsWithDetails(ctx, roomsNeedingDetails, 20);
      const detailMap = new Map(detailRooms.map(r => [r.roomId, r]));
      for (let i = 0; i < deduped.length; i++) {
        const detail = detailMap.get(deduped[i].roomId);
        if (!detail) continue;
        deduped[i] = {
          ...deduped[i],
          ...detail,
          roomName: deduped[i].roomName || detail.roomName,
          source: deduped[i].source,
          sources: [...new Set([...(deduped[i].sources || []), ...(detail.sources || [])])],
          seenAt: deduped[i].seenAt || detail.seenAt
        };
      }
    } catch {
      // 群详情不是同步列表的硬依赖；拿不到成员明细时仍保留群列表结果。
    }
  }

  const filtered = deduped.filter(r => isExternalRoom(r, includeInternalGroups));

  const classifiedRooms = [];
  for (const room of filtered) {
    if (!autoClassify) {
      classifiedRooms.push({
        ...room,
        reviewStatus: 'IMPORTED',
        confidence: 0,
        reason: '自动分类已关闭',
        matchedKeywords: []
      });
      continue;
    }

    let text = room.roomName || '';
    let classification = classifyGroupByName(text, classifier);

    if (previewMessages > 0 && previewOnlyForUnsure && classification.reviewStatus !== 'AUTO_CONFIRMED') {
      try {
        const previews = await fetchPreviewMessages(ctx, room.roomId, previewMessages);
        if (previews.length) {
          text += ' ' + previews.join(' ');
          classification = classifyGroupByName(text, classifier);
        }
      } catch {
        // 忽略消息拉取失败，保留初次分类结果
      }
    }

    classifiedRooms.push({ ...room, ...classification });
  }

  const runDir = createRunDir('groups', 'sync-external-groups');
  const fileName = timestampFileName();
  const filePath = path.join(runDir, fileName);

  const manifest = {
    scope,
    maxPages,
    includeInternalGroups,
    autoClassify,
    previewMessages,
    previewOnlyForUnsure,
    matchMode: classifier.matchMode,
    threshold: classifier.threshold,
    total: classifiedRooms.length,
    sources: countBySource(classifiedRooms),
    files: [fileName]
  };

  fs.writeFileSync(filePath, JSON.stringify(classifiedRooms, null, 2), 'utf8');
  const manifestPath = writeRunManifest(runDir, manifest);

  const latestFile = latestPath('groups', 'rooms-latest.json');
  fs.writeFileSync(latestFile, JSON.stringify(classifiedRooms, null, 2), 'utf8');

  const scanManifestPath = path.join(groupsDir(), 'group-scan-manifest.json');
  fs.writeFileSync(scanManifestPath, JSON.stringify({
    lastRunAt: new Date().toISOString(),
    lastRunDir: path.relative(outputsRoot(), runDir),
    scope,
    total: classifiedRooms.length,
    autoConfirmed: classifiedRooms.filter(r => r.reviewStatus === 'AUTO_CONFIRMED').length,
    suggested: classifiedRooms.filter(r => r.reviewStatus === 'SUGGESTED').length,
    imported: classifiedRooms.filter(r => r.reviewStatus === 'IMPORTED').length
  }, null, 2), 'utf8');

  const discoveredCustomers = recordCustomersFromGroups(classifiedRooms, { source: 'group-sync' });

  return okResult({
    assistantMessage: `外部群同步完成：扫描到 ${classifiedRooms.length} 个群（scope=${scope}）。`,
    summary: {
      scanned: classifiedRooms.length,
      selfCount: perSource.roomList.rooms.length,
      sessionCount: perSource.session.rooms.length,
      messageCount: perSource.messages.rooms.length,
      mergedCount: deduped.length,
      externalCount: filtered.length,
      autoConfirmed: classifiedRooms.filter(r => r.reviewStatus === 'AUTO_CONFIRMED').length,
      suggested: classifiedRooms.filter(r => r.reviewStatus === 'SUGGESTED').length,
      imported: classifiedRooms.filter(r => r.reviewStatus === 'IMPORTED').length,
      discoveredCustomers: discoveredCustomers.discovered,
      previewMessages,
      previewOnlyForUnsure,
      pages: perSource.roomList.pages + perSource.session.pages + perSource.messages.pages
    },
    data: {
      rooms: classifiedRooms.slice(0, 20),
      filePath: path.relative(outputsRoot(), filePath),
      manifestPath: path.relative(outputsRoot(), manifestPath)
    },
    files: [filePath, manifestPath]
  });
});

const qiweiListExternalGroups = safeResult(async function qiweiListExternalGroups(input = {}) {
  const rooms = readLatestRooms();
  const confirmed = readConfirmedMapping();
  const rejected = readRejectedMapping();
  const classifier = buildClassifierConfig(input);

  let result = rooms.map(room => {
    const mapped = confirmed[room.roomId];
    const rejectedRecord = rejected[room.roomId];

    if (rejectedRecord) {
      return {
        ...room,
        reviewStatus: 'REJECTED',
        confidence: 0,
        reason: rejectedRecord.reason || '经纪人手动拒绝',
        matchedKeywords: [],
        customerId: undefined,
        externalUserId: undefined
      };
    }

    if (mapped) {
      return {
        ...room,
        reviewStatus: 'CONFIRMED',
        confidence: 1.0,
        reason: '经纪人手动确认',
        matchedKeywords: [],
        customerId: mapped.customerId,
        externalUserId: mapped.externalUserId,
        customerName: mapped.customerName
      };
    }

    const classification = classifyGroupByName(room.roomName, classifier);
    return { ...room, ...classification };
  });

  const keyword = String(input.keyword || '').trim();
  if (keyword) {
    result = result.filter(r => (r.roomName || '').includes(keyword) || (r.roomId || '').includes(keyword));
  }

  const statusFilter = String(input.status || '').trim();
  if (statusFilter) {
    result = result.filter(r => r.reviewStatus === statusFilter);
  }

  const sourceFilter = String(input.source || '').trim();
  if (sourceFilter) {
    result = result.filter(r => r.sources && r.sources.includes(sourceFilter));
  }

  if (input.includeRejected !== true) {
    result = result.filter(r => r.reviewStatus !== 'REJECTED');
  }

  return okResult({
    assistantMessage: `共 ${result.length} 个外部群（已同步 ${rooms.length}）。`,
    summary: {
      total: result.length,
      imported: result.filter(r => r.reviewStatus === 'IMPORTED').length,
      suggested: result.filter(r => r.reviewStatus === 'SUGGESTED').length,
      autoConfirmed: result.filter(r => r.reviewStatus === 'AUTO_CONFIRMED').length,
      confirmed: result.filter(r => r.reviewStatus === 'CONFIRMED').length,
      rejected: result.filter(r => r.reviewStatus === 'REJECTED').length
    },
    data: { groups: result }
  });
});

async function fetchPreviewMessages(ctx, roomId, previewMessages) {
  const texts = [];
  let msgSeq = 0;
  let hasMore = true;
  let pages = 0;
  const maxPages = Math.min(10, Math.ceil(previewMessages / 100));

  while (hasMore && pages < maxPages && texts.length < previewMessages) {
    pages++;
    const data = await gatewayCall(ctx, REQUIRED_METHODS.syncMsg, {
      guid: ctx.guid,
      msgSeq,
      limit: 100
    });
    const msgList = Array.isArray(data && data.syncMsgList) ? data.syncMsgList : [];
    hasMore = Boolean(data.hasMore);
    msgSeq = data.travelSyncKey ?? msgSeq + 1;

    for (const msg of msgList) {
      if (String(msg.fromRoomId || '') !== roomId) continue;
      const content = String(msg.content || msg.msgContent || '').trim();
      if (content) texts.push(content);
      if (texts.length >= previewMessages) break;
    }

    if (!msgList.length) break;
  }

  return texts;
}

const qiweiAnalyzeGroupMembers = safeResult(async function qiweiAnalyzeGroupMembers(input = {}) {
  assertMethodsInCatalog({ batchGetRoomDetail: REQUIRED_METHODS.batchGetRoomDetail });
  const ctx = buildContext(input);
  requireGuid(ctx);

  const roomIds = Array.isArray(input.roomIds) ? input.roomIds.map(String).filter(Boolean) : [];
  if (!roomIds.length) return errorResult('缺少 roomIds');

  const classifier = buildClassifierConfig(input);
  const autoClassify = input.autoClassify !== false;
  const previewMessages = Math.max(0, Math.min(100, Number(input.previewMessages || 0)));
  const updateSnapshot = input.updateSnapshot === true;

  const details = await enrichRoomsWithDetails(ctx, roomIds, 20);

  const classified = [];
  for (const room of details) {
    let text = room.roomName || '';
    if (previewMessages > 0) {
      try {
        const previews = await fetchPreviewMessages(ctx, room.roomId, previewMessages);
        if (previews.length) text += ' ' + previews.join(' ');
      } catch {
        // 忽略消息拉取失败
      }
    }

    if (!autoClassify) {
      classified.push({ ...room, reviewStatus: 'IMPORTED', confidence: 0, reason: '自动分类已关闭', matchedKeywords: [] });
      continue;
    }

    const classification = classifyGroupByName(text, classifier);
    classified.push({ ...room, ...classification });
  }

  if (updateSnapshot) {
    const snapshot = readLatestRooms();
    const snapshotMap = new Map(snapshot.map(r => [r.roomId, r]));
    for (const room of classified) {
      snapshotMap.set(room.roomId, room);
    }
    fs.writeFileSync(latestPath('groups', 'rooms-latest.json'), JSON.stringify(Array.from(snapshotMap.values()), null, 2), 'utf8');
  }

  const discoveredCustomers = recordCustomersFromGroups(classified, { source: 'group-analysis' });

  return okResult({
    assistantMessage: `群成员分析完成：分析 ${classified.length} 个群。`,
    summary: {
      analyzed: classified.length,
      autoConfirmed: classified.filter(d => d.reviewStatus === 'AUTO_CONFIRMED').length,
      suggested: classified.filter(d => d.reviewStatus === 'SUGGESTED').length,
      imported: classified.filter(d => d.reviewStatus === 'IMPORTED').length,
      discoveredCustomers: discoveredCustomers.discovered
    },
    data: { details: classified }
  });
});

function updateConfirmedMapping(roomId, fields) {
  const mapping = readConfirmedMapping();
  mapping[roomId] = { ...(mapping[roomId] || {}), ...fields, confirmedAt: new Date().toISOString() };
  writeConfirmedMapping(mapping);
  return mapping[roomId];
}

function importedMappingPath() {
  ensureGroupsDir();
  return path.join(groupsDir(), 'imported-mapping.json');
}

function readImportedMapping() {
  return safeReadJson(importedMappingPath(), {});
}

function writeImportedMapping(mapping) {
  ensureGroupsDir();
  fs.writeFileSync(importedMappingPath(), JSON.stringify(mapping, null, 2), 'utf8');
}

function updateConfirmedMapping(roomId, fields) {
  const mapping = readConfirmedMapping();
  mapping[roomId] = { ...(mapping[roomId] || {}), ...fields, confirmedAt: new Date().toISOString() };
  writeConfirmedMapping(mapping);
  return mapping[roomId];
}

function updateImportedMapping(roomId, fields) {
  const mapping = readImportedMapping();
  mapping[roomId] = { ...(mapping[roomId] || {}), ...fields, importedAt: new Date().toISOString() };
  writeImportedMapping(mapping);
  return mapping[roomId];
}

const qiweiConfirmExternalGroup = safeResult(async function qiweiConfirmExternalGroup(input = {}) {
  const roomId = String(input.roomId || '').trim();
  if (!roomId) return errorResult('缺少 roomId');

  const customerId = String(input.customerId || '').trim() || undefined;
  const externalUserId = String(input.externalUserId || '').trim() || undefined;
  const customerName = String(input.customerName || '').trim() || undefined;

  const rooms = readLatestRooms();
  const room = rooms.find(r => r.roomId === roomId);
  if (!room) return errorResult(`roomId ${roomId} 不在最近一次同步的群列表中，请先调用 qiwei_sync_external_groups 或改用 qiwei_add_external_group`);

  const record = updateConfirmedMapping(roomId, { customerId, externalUserId, customerName, roomName: room.roomName });
  const roomsForDiscovery = rooms.map(item => item.roomId === roomId
    ? {
        ...item,
        reviewStatus: 'CONFIRMED',
        customerId,
        externalUserId,
        customerName,
        roomName: item.roomName || room.roomName
      }
    : item);
  const discoveredCustomers = recordCustomersFromGroups(roomsForDiscovery, { source: 'group-confirm' });

  return okResult({
    assistantMessage: `已确认外部群为客户群：${room.roomName || roomId}。`,
    summary: { roomId, roomName: room.roomName, reviewStatus: 'CONFIRMED', discoveredCustomers: discoveredCustomers.discovered },
    data: record
  });
});

const qiweiAddExternalGroup = safeResult(async function qiweiAddExternalGroup(input = {}) {
  const roomId = String(input.roomId || '').trim();
  if (!roomId) return errorResult('缺少 roomId');

  const customerId = String(input.customerId || '').trim() || undefined;
  const externalUserId = String(input.externalUserId || '').trim() || undefined;
  const customerName = String(input.customerName || '').trim() || undefined;
  const roomName = String(input.roomName || '').trim() || undefined;

  const record = updateConfirmedMapping(roomId, { customerId, externalUserId, customerName, roomName });

  return okResult({
    assistantMessage: `已手动添加外部群：${roomName || roomId}。`,
    summary: { roomId, reviewStatus: 'CONFIRMED' },
    data: record
  });
});

const qiweiConfigureGroupKeywords = safeResult(async function qiweiConfigureGroupKeywords(input = {}) {
  if (input.reset === true) {
    saveCustomerKeywords(DEFAULT_KEYWORD_CONFIG);
    return okResult({
      assistantMessage: '已重置为客户群关键词默认配置。',
      summary: { ...DEFAULT_KEYWORD_CONFIG, keywordCount: DEFAULT_KEYWORD_CONFIG.keywords.length },
      data: { config: DEFAULT_KEYWORD_CONFIG }
    });
  }

  const current = loadCustomerKeywords();
  const next = {
    matchMode: input.matchMode === 'any' || input.matchMode === 'threshold'
      ? input.matchMode
      : current.matchMode,
    threshold: Math.max(1, Number(input.threshold || current.threshold) || 1),
    highConfidenceTerms: Array.isArray(input.highConfidenceTerms)
      ? input.highConfidenceTerms
      : current.highConfidenceTerms,
    keywords: Array.isArray(input.keywords)
      ? input.keywords
      : current.keywords
  };

  saveCustomerKeywords(next);

  return okResult({
    assistantMessage: `已更新客户群关键词配置：模式 ${next.matchMode}，关键词 ${next.keywords.length} 个，高置信度 ${next.highConfidenceTerms.length} 个。`,
    summary: {
      matchMode: next.matchMode,
      threshold: next.threshold,
      keywordCount: next.keywords.length,
      highConfidenceCount: next.highConfidenceTerms.length
    },
    data: { config: next }
  });
});

const qiweiRejectExternalGroup = safeResult(async function qiweiRejectExternalGroup(input = {}) {
  const roomId = String(input.roomId || '').trim();
  if (!roomId) return errorResult('缺少 roomId');

  const rooms = readLatestRooms();
  const room = rooms.find(r => r.roomId === roomId);
  if (!room) return errorResult(`roomId ${roomId} 不在最近一次同步的群列表中`);

  const mapping = readRejectedMapping();
  mapping[roomId] = {
    roomId,
    roomName: room.roomName,
    rejectedAt: new Date().toISOString(),
    reason: String(input.reason || '经纪人手动拒绝')
  };
  writeRejectedMapping(mapping);

  return okResult({
    assistantMessage: `已拒绝外部群：${room.roomName || roomId}。`,
    summary: { roomId, roomName: room.roomName, reviewStatus: 'REJECTED' },
    data: mapping[roomId]
  });
});

const qiweiSyncGroupMessages = safeResult(async function qiweiSyncGroupMessages(input = {}) {
  assertMethodsInCatalog({ syncMsg: REQUIRED_METHODS.syncMsg });
  const ctx = buildContext(input);
  requireGuid(ctx);

  const roomIds = Array.isArray(input.roomIds) ? input.roomIds.map(String).filter(Boolean) : null;
  const maxPages = Math.max(1, Math.min(300, Number(input.maxPages || 100)));
  const maxMessagesPerRoom = Math.max(1, Math.min(5000, Number(input.maxMessagesPerRoom || 1000)));

  let targetRoomIds = roomIds;
  if (!targetRoomIds) {
    const mapping = readConfirmedMapping();
    targetRoomIds = Object.keys(mapping);
    if (!targetRoomIds.length) return errorResult('未指定 roomIds 且没有已确认的客户群映射，请先调用 qiwei_confirm_external_group');
  }

  const results = [];
  for (const roomId of targetRoomIds) {
    let hasMore = true;
    let msgSeq = 0;
    let pages = 0;
    let newCount = 0;
    const messages = [];

    while (hasMore && pages < maxPages && newCount < maxMessagesPerRoom) {
      pages++;
      const data = await gatewayCall(ctx, REQUIRED_METHODS.syncMsg, {
        guid: ctx.guid,
        msgSeq,
        limit: 200
      });
      const msgList = Array.isArray(data && data.syncMsgList) ? data.syncMsgList : [];
      hasMore = Boolean(data.hasMore);
      msgSeq = data.travelSyncKey ?? msgSeq + 1;

      for (const msg of msgList) {
        const msgRoomId = String(msg.fromRoomId || '');
        if (msgRoomId !== roomId) continue;
        messages.push({
          msgId: msg.msgUniqueIdentifier || msg.msgServerId || `${roomId}_${msg.seq}`,
          seq: msg.seq,
          senderId: msg.senderId || '',
          senderName: msg.senderName || '',
          receiverId: msg.receiverId || '',
          fromRoomId: msg.fromRoomId || roomId,
          msgType: String(msg.msgType),
          content: extractMessageContent(msg),
          timestamp: msg.timestamp ? new Date(msg.timestamp * 1000).toISOString() : new Date().toISOString(),
          rawData: msg
        });
        newCount++;
      }

      if (!msgList.length) break;
    }

    if (messages.length) {
      ensureMessagesDir();
      let writtenCount = 0;
      for (const message of messages) {
        if (appendWebhookMessage(roomId, message)) writtenCount++;
      }

      // 更新 confirmed-mapping 的 lastMsgAt / lastSyncSeq
      const mapping = readConfirmedMapping();
      if (mapping[roomId]) {
        const maxSeq = Math.max(...messages.map(m => Number(m.seq) || 0));
        const lastMsg = messages[messages.length - 1];
        mapping[roomId].lastMsgAt = lastMsg.timestamp || new Date().toISOString();
        mapping[roomId].lastSyncSeq = Math.max(mapping[roomId].lastSyncSeq || 0, maxSeq);
        writeConfirmedMapping(mapping);
        recordGroupSync(roomId, {
          messageCount: writtenCount,
          lastMsgAt: lastMsg.timestamp || new Date().toISOString(),
          lastSyncSeq: mapping[roomId].lastSyncSeq
        });
      }

      results.push({ roomId, newCount: writtenCount, fileCount: messages.length });
    } else {
      results.push({ roomId, newCount: 0, fileCount: 0 });
    }
  }

  const totalNew = results.reduce((sum, r) => sum + r.newCount, 0);
  return okResult({
    assistantMessage: `群消息同步完成：${targetRoomIds.length} 个群，共 ${totalNew} 条新消息。`,
    summary: { rooms: targetRoomIds.length, totalNew, syncedRooms: results.filter(r => r.newCount > 0).length },
    data: { results },
    files: results.filter(r => r.filePath).map(r => path.join(outputsRoot(), r.filePath))
  });
});

module.exports = {
  qiweiSyncExternalGroups,
  qiweiListExternalGroups,
  qiweiAnalyzeGroupMembers,
  qiweiConfirmExternalGroup,
  qiweiAddExternalGroup,
  qiweiConfigureGroupKeywords,
  qiweiRejectExternalGroup,
  qiweiSyncGroupMessages,
  readConfirmedMapping,
  writeConfirmedMapping,
  updateConfirmedMapping,
  readImportedMapping,
  writeImportedMapping,
  updateImportedMapping
};