const express = require('express');
const transferService = require('../services/transferService');
const { auth: authenticateToken } = require('../middleware/auth');
const { validate, validateQuery, transferSchemas, commonSchemas } = require('../middleware/validation');
const { logger } = require('../config/logger');
const { HTTP_STATUS } = require('../config/constants');
const { getDB } = require('../database');
const multer = require('multer');
const path = require('path');
const dayjs = require('dayjs');

const router = express.Router();

// 配置文件上传
const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/')
  },
  filename: function (req, file, cb) {
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9)
    cb(null, 'voucher-' + uniqueSuffix + path.extname(file.originalname))
  }
});

const upload = multer({
  storage: storage,
  fileFilter: (req, file, cb) => {
    if (file.mimetype.startsWith('image/')) {
      cb(null, true);
    } else {
      cb(new Error('只允许上传图片文件'));
    }
  },
  limits: {
    fileSize: 5 * 1024 * 1024 // 5MB
  }
});

/**
 * 获取转账列表
 * @param {string} status - 转账状态过滤
 * @param {string} transfer_type - 转账类型过滤
 * @param {string} start_date - 开始日期过滤
 * @param {string} end_date - 结束日期过滤
 * @param {string} search - 搜索关键词（用户名或真实姓名）
 * @param {number} page - 页码
 * @param {number} limit - 每页数量
 * @param {string} sort - 排序字段
 * @param {string} order - 排序方向（asc/desc）
 */
router.get('/', 
  authenticateToken, 
  validateQuery(transferSchemas.query), 
  async (req, res, next) => {
    try {
      const { page, limit, status, transfer_type, start_date, end_date, search, sort, order } = req.query;
      
      const filters = {
        status,
        transfer_type,
        start_date,
        end_date,
        search
      };
      
      // 非管理员只能查看自己相关的转账
      if (req.user.role !== 'admin') {
        filters.user_id = req.user.id;
      }
      
      const result = await transferService.getTransfers(filters, { page, limit, sort, order });
      
      logger.info('Transfer list requested', {
        userId: req.user.id,
        filters,
        resultCount: result.transfers.length
      });
      
      res.json({
        success: true,
        data: result
      });
    } catch (error) {
      next(error);
    }
  }
);

// 获取转账记录列表
router.get('/list', 
  authenticateToken, 
  validateQuery(transferSchemas.query), 
  async (req, res, next) => {
    try {
      const { page, limit, status, transfer_type, start_date, end_date, sort, order } = req.query;
      
      const filters = {
        status,
        transfer_type,
        start_date,
        end_date
      };
      
      // 非管理员只能查看自己相关的转账
      if (req.user.role !== 'admin') {
        filters.user_id = req.user.id;
      }
      
      const result = await transferService.getTransfers(filters, { page, limit, sort, order });
      
      logger.info('Transfer list requested', {
        userId: req.user.id,
        filters,
        resultCount: result.transfers.length
      });
      
      res.json({
        success: true,
        data: result
      });
    } catch (error) {
      next(error);
    }
  }
);

// 获取公户信息
router.get('/public-account', authenticateToken, async (req, res) => {
  try {
    const db = getDB();
    const [publicUser] = await db.execute(`
      SELECT id, username, real_name, balance 
      FROM users 
      WHERE username = 'public_account' AND is_system_account = TRUE
    `);

    if (publicUser.length === 0) {
      return res.status(404).json({ success: false, message: '公户不存在' });
    }

    res.json({ success: true, data: publicUser[0] });
  } catch (error) {
    console.error('获取公户信息失败:', error);
    res.status(500).json({ success: false, message: '服务器错误' });
  }
});

// 创建转账记录
router.post('/create', 
  authenticateToken, 
  validate(transferSchemas.create), 
  async (req, res, next) => {
    try {
      const result = await transferService.createTransfer(req.user.id, req.body);
      
      logger.info('Transfer creation requested', {
        userId: req.user.id,
        transferId: result.transfer_id,
        amount: req.body.amount
      });
      
      res.status(HTTP_STATUS.CREATED).json({
        success: true,
        message: '转账记录创建成功，等待确认',
        data: result
      });
    } catch (error) {
      next(error);
    }
  }
);

// 管理员创建转账记录
router.post('/admin/create', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      // 检查管理员权限
      if (req.user.role !== 'admin') {
        return res.status(403).json({ success: false, message: '权限不足' });
      }
      
      const { from_user_id, to_user_id, amount, transfer_type, description } = req.body;
      
      // 验证必填字段
      if (!from_user_id || !to_user_id || !amount || !transfer_type) {
        return res.status(400).json({ success: false, message: '缺少必填字段' });
      }
      
      const result = await transferService.createTransfer(from_user_id, {
        to_user_id,
        amount,
        transfer_type,
        description: description || '管理员分配转账'
      });
      
      logger.info('Admin transfer creation requested', {
        adminId: req.user.id,
        fromUserId: from_user_id,
        toUserId: to_user_id,
        transferId: result.transfer_id,
        amount: amount
      });
      
      res.status(HTTP_STATUS.CREATED).json({
        success: true,
        message: '转账分配成功',
        data: result
      });
    } catch (error) {
      next(error);
    }
  }
);

// 确认转账
router.post('/confirm', 
  authenticateToken, 
  validate(transferSchemas.confirm), 
  async (req, res, next) => {
    try {
      const { transfer_id, note } = req.body;
      
      await transferService.confirmTransfer(transfer_id, note, req.user.id);
      
      logger.info('Transfer confirmed', {
        transferId: transfer_id,
        operatorId: req.user.id
      });
      
      res.json({
        success: true,
        message: '转账确认成功'
      });
    } catch (error) {
      next(error);
    }
  }
);

// 确认转账（路径参数形式）
router.post('/confirm/:id', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      const transfer_id = req.params.id;
      const { action, note } = req.body;
      
      // 验证action参数
      if (action !== 'confirm') {
        return res.status(400).json({ 
          success: false, 
          message: 'action参数必须为confirm' 
        });
      }
      
      await transferService.confirmTransfer(transfer_id, note, req.user.id);
      
      logger.info('Transfer confirmed via path param', {
        transferId: transfer_id,
        operatorId: req.user.id
      });
      
      res.json({
        success: true,
        message: '转账确认成功'
      });
    } catch (error) {
      next(error);
    }
  }
);

// 拒绝转账
router.post('/reject', 
  authenticateToken, 
  validate(transferSchemas.reject), 
  async (req, res, next) => {
    try {
      const { transfer_id, note='' } = req.body;
      
      await transferService.rejectTransfer(transfer_id, note, req.user.id);
      
      logger.info('Transfer rejected', {
        transferId: transfer_id,
        operatorId: req.user.id
      });
      
      res.json({
        success: true,
        message: '转账已拒绝'
      });
    } catch (error) {
      next(error);
    }
  }
);

// 用户确认收到转账
router.post('/confirm-received', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      const { transfer_id } = req.body;
      
      if (!transfer_id) {
        return res.status(400).json({ success: false, message: '缺少转账ID' });
      }
      
      await transferService.confirmReceived(transfer_id, req.user.id);
      
      logger.info('Transfer received confirmed by user', {
        transferId: transfer_id,
        userId: req.user.id
      });
      
      res.json({
        success: true,
        message: '已确认收到转账，余额已更新'
      });
    } catch (error) {
      next(error);
    }
  }
);

// 用户确认未收到转账
router.post('/confirm-not-received', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      const { transfer_id } = req.body;
      
      if (!transfer_id) {
        return res.status(400).json({ success: false, message: '缺少转账ID' });
      }
      
      await transferService.confirmNotReceived(transfer_id, req.user.id);
      
      logger.info('Transfer not received confirmed by user', {
        transferId: transfer_id,
        userId: req.user.id
      });
      
      res.json({
        success: true,
        message: '已确认未收到转账'
      });
    } catch (error) {
      next(error);
    }
  }
);

// 触发返还转账逻辑
async function triggerReturnTransfers(db, user_id, total_amount) {
  // 将总金额分成3笔随机金额
  const amounts = generateRandomAmounts(total_amount, 3);
  const batch_id = `return_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;

  // 获取公户ID
  const [publicAccount] = await db.execute(`
    SELECT u.id FROM users u WHERE u.username = 'public_account'
  `);

  if (publicAccount.length === 0) {
    throw new Error('公户不存在');
  }

  const public_user_id = publicAccount[0].id;

  // 创建3笔返还转账记录
  for (let i = 0; i < amounts.length; i++) {
    await db.execute(`
      INSERT INTO transfers (from_user_id, to_user_id, amount, transfer_type, description, batch_id, status)
      VALUES (?, ?, ?, 'return', ?, ?, 'pending')
    `, [
      public_user_id,
      user_id,
      amounts[i],
      `返还转账 ${i + 1}/3`,
      batch_id
    ]);
  }
}

// 生成随机金额分配
function generateRandomAmounts(total, count) {
  const amounts = [];
  let remaining = parseFloat(total);

  for (let i = 0; i < count - 1; i++) {
    // 确保每笔至少1元，最多不超过剩余金额的80%
    const min = 1;
    const max = Math.max(min, remaining * 0.8);
    const amount = Math.round((Math.random() * (max - min) + min) * 100) / 100;
    amounts.push(amount);
    remaining -= amount;
  }

  // 最后一笔是剩余金额
  amounts.push(Math.round(remaining * 100) / 100);

  return amounts;
}

// 获取用户转账记录
router.get('/user/:userId', authenticateToken, async (req, res) => {
  try {
    const userId = req.params.userId;
    const { page = 1, limit = 10, status } = req.query;

    // 检查权限（只能查看自己的记录或管理员查看所有）
    // if (req.user.id != userId && req.user.role !== 'admin') {
    //   return res.status(403).json({ success: false, message: '权限不足' });
    // }

    const db = getDB();

    // 确保参数为有效数字
    const pageNum = Math.max(1, parseInt(page) || 1);
    const limitNum = Math.max(1, Math.min(100, parseInt(limit) || 10));
    const offset = Math.max(0, (pageNum - 1) * limitNum);

    let whereClause = 'WHERE (t.from_user_id = ? OR t.to_user_id = ?)';
    const userIdInt = parseInt(userId);
    let listParams = [userIdInt, userIdInt];
    let countParams = [userIdInt, userIdInt];

    if (status) {
      whereClause += ' AND t.status = ?';
      listParams.push(status);
      countParams.push(status);
    }

    // 添加分页参数
    listParams.push(limitNum.toString(), offset.toString());

    const [transfers] = await db.execute(`
      SELECT 
        t.*,
        from_user.username as from_username,
        from_user.real_name as from_real_name,
        to_user.username as to_username,
        to_user.real_name as to_real_name
      FROM transfers t
      LEFT JOIN users from_user ON t.from_user_id = from_user.id
      LEFT JOIN users to_user ON t.to_user_id = to_user.id
      ${whereClause}
      ORDER BY t.created_at DESC
      LIMIT ? OFFSET ?
    `, listParams);

    const [countResult] = await db.execute(`
      SELECT COUNT(*) as total FROM transfers t ${whereClause}
    `, countParams);

    res.json({
      success: true,
      data: {
        transfers,
        pagination: {
          page: pageNum,
          limit: limitNum,
          total: countResult[0].total,
          pages: Math.ceil(countResult[0].total / limitNum)
        }
      }
    });
  } catch (error) {
    console.error('获取转账记录失败:', error);
    res.status(500).json({ success: false, message: '服务器错误' });
  }
});

// 获取转账统计信息
router.get('/stats', authenticateToken, async (req, res) => {
  try {
    const userId = req.user.id;
    const isAdmin = req.user.role === 'admin';
    const db = getDB();
    
    let stats = {};
    
    if (isAdmin) {
      // 管理员可以查看全局统计
      const [totalStats] = await db.execute(`
        SELECT 
          COUNT(*) as total_transfers,
          SUM(amount) as total_flow_amount,
          SUM(CASE WHEN status = 'pending' THEN 1 ELSE 0 END) as pending_count,
          SUM(CASE WHEN status = 'confirmed' THEN 1 ELSE 0 END) as confirmed_count,
          SUM(CASE WHEN status = 'received' THEN 1 ELSE 0 END) as received_count,
          SUM(CASE WHEN status = 'rejected' THEN 1 ELSE 0 END) as rejected_count,
          SUM(CASE WHEN status = 'cancelled' THEN 1 ELSE 0 END) as cancelled_count,
          SUM(CASE WHEN status = 'not_received' THEN 1 ELSE 0 END) as not_received_count,
          SUM(CASE WHEN is_overdue = 1 THEN 1 ELSE 0 END) as overdue_count,
          SUM(CASE WHEN is_bad_debt = 1 THEN 1 ELSE 0 END) as bad_debt_count,
          SUM(CASE WHEN status = 'confirmed' THEN amount ELSE 0 END) as total_amount,
          SUM(CASE WHEN is_bad_debt = 1 THEN amount ELSE 0 END) as bad_debt_amount,
          SUM(CASE WHEN transfer_type = 'initial' AND status = 'confirmed' THEN amount ELSE 0 END) as initial_amount,
          SUM(CASE WHEN transfer_type = 'return' AND status = 'confirmed' THEN amount ELSE 0 END) as return_amount,
          SUM(CASE WHEN transfer_type = 'user_to_user' AND status = 'confirmed' THEN amount ELSE 0 END) as user_to_user_amount,
          (SELECT SUM(balance) FROM users WHERE role = 'user' AND is_system_account = 1) as total_merchant_balance,
          COUNT(CASE WHEN status IN ('confirmed', 'received') THEN 1 END) as participated_transfers
        FROM transfers
      `);
      
      const todayStr = dayjs().format('YYYY-MM-DD');
      const currentYear = dayjs().year();
      const currentMonth = dayjs().month() + 1;
      console.log(todayStr,'todayStr');
      
      const [todayStats] = await db.execute(`
        SELECT 
          COUNT(*) as today_transfers,
          (
            COALESCE((SELECT SUM(amount) FROM transfers WHERE DATE(created_at) = ? AND to_user_id IN (SELECT id FROM users WHERE is_system_account = 1) AND status = 'received'), 0) -
            COALESCE((SELECT SUM(amount) FROM transfers WHERE DATE(created_at) = ? AND from_user_id IN (SELECT id FROM users WHERE is_system_account = 1) AND status = 'received'), 0)
          ) as today_amount
        FROM transfers 
        WHERE DATE(created_at) = ?
      `, [todayStr, todayStr, todayStr]);
      
      const [monthlyStats] = await db.execute(`
        SELECT 
          COUNT(*) as monthly_transfers,
          SUM(CASE WHEN status = 'received' THEN amount ELSE 0 END) as monthly_amount,
          COUNT(CASE WHEN status IN ('confirmed', 'received') THEN 1 END) as monthly_participated_transfers
        FROM transfers 
        WHERE YEAR(created_at) = ? AND MONTH(created_at) = ?
      `, [currentYear, currentMonth]);
      
      // 获取上月统计数据用于对比
      const lastMonth = currentMonth === 1 ? 12 : currentMonth - 1;
      const lastMonthYear = currentMonth === 1 ? currentYear - 1 : currentYear;
      
      const [lastMonthStats] = await db.execute(`
        SELECT 
          COUNT(*) as last_monthly_transfers,
          SUM(CASE WHEN status = 'confirmed' THEN amount ELSE 0 END) as last_monthly_amount,
          COUNT(CASE WHEN status IN ('confirmed', 'received') THEN 1 END) as last_monthly_participated_transfers
        FROM transfers 
        WHERE YEAR(created_at) = ? AND MONTH(created_at) = ?
      `, [lastMonthYear, lastMonth]);
      
      stats = {
        total: {
          transfers: totalStats[0].total_transfers || 0,
          pending: parseFloat(totalStats[0].total_flow_amount || 0),
          pending_count: totalStats[0].pending_count || 0,
          confirmed: totalStats[0].confirmed_count || 0,
          received_count: totalStats[0].received_count || 0,
          rejected: totalStats[0].rejected_count || 0,
          cancelled_count: totalStats[0].cancelled_count || 0,
          not_received_count: totalStats[0].not_received_count || 0,
          overdue: totalStats[0].overdue_count || 0,
          bad_debt: totalStats[0].bad_debt_count || 0,
          amount: parseFloat(totalStats[0].total_amount || 0),
          bad_debt_amount: parseFloat(totalStats[0].bad_debt_amount || 0),
          total_merchant_balance: parseFloat(totalStats[0].total_merchant_balance || 0),
          initial_amount: parseFloat(totalStats[0].initial_amount || 0),
          return_amount: parseFloat(totalStats[0].return_amount || 0),
          user_to_user_amount: parseFloat(totalStats[0].user_to_user_amount || 0),
          participated_transfers: totalStats[0].participated_transfers || 0
        },
        today: {
          transfers: todayStats[0].today_transfers || 0,
          amount: parseFloat(todayStats[0].today_amount || 0)
        },
        monthly: {
          transfers: monthlyStats[0].monthly_transfers || 0,
          amount: parseFloat(monthlyStats[0].monthly_amount || 0),
          participated_transfers: monthlyStats[0].monthly_participated_transfers || 0
        },
        lastMonth: {
          transfers: lastMonthStats[0].last_monthly_transfers || 0,
          amount: parseFloat(lastMonthStats[0].last_monthly_amount || 0),
          participated_transfers: lastMonthStats[0].last_monthly_participated_transfers || 0
        }
      };
    } else {
      // 普通用户只能查看自己的统计
      const [userStats] = await db.execute(`
        SELECT 
          COUNT(*) as total_transfers,
          SUM(CASE WHEN status = 'pending' THEN 1 ELSE 0 END) as pending_count,
          SUM(CASE WHEN status = 'confirmed' THEN 1 ELSE 0 END) as confirmed_count,
          SUM(CASE WHEN status = 'rejected' THEN 1 ELSE 0 END) as rejected_count,
          SUM(CASE WHEN status = 'confirmed' AND from_user_id = ? THEN amount ELSE 0 END) as sent_amount,
          SUM(CASE WHEN status = 'confirmed' AND to_user_id = ? THEN amount ELSE 0 END) as received_amount
        FROM transfers 
        WHERE from_user_id = ? OR to_user_id = ?
      `, [userId, userId, userId, userId]);
      
      const todayStr = dayjs().format('YYYY-MM-DD');
      
      const [todayStats] = await db.execute(`
        SELECT 
          COUNT(*) as today_transfers,
          SUM(CASE WHEN status = 'confirmed' AND from_user_id = ? THEN amount ELSE 0 END) as today_sent,
          SUM(CASE WHEN status = 'confirmed' AND to_user_id = ? THEN amount ELSE 0 END) as today_received
        FROM transfers 
        WHERE (from_user_id = ? OR to_user_id = ?) AND DATE(created_at) = ?
      `, [userId, userId, userId, userId, todayStr]);
      
      stats = {
        total: {
          transfers: userStats[0].total_transfers || 0,
          pending: userStats[0].pending_count || 0,
          confirmed: userStats[0].confirmed_count || 0,
          rejected: userStats[0].rejected_count || 0,
          sent_amount: parseFloat(userStats[0].sent_amount || 0),
          received_amount: parseFloat(userStats[0].received_amount || 0)
        },
        today: {
          transfers: todayStats[0].today_transfers || 0,
          sent_amount: parseFloat(todayStats[0].today_sent || 0),
          received_amount: parseFloat(todayStats[0].today_received || 0)
        }
      };
    }
    
    res.json({ success: true, data: stats });
  } catch (error) {
    console.error('获取转账统计失败:', error);
    res.status(500).json({ success: false, message: '获取转账统计失败' });
  }
});

// 获取待确认的转账
router.get('/pending', authenticateToken, async (req, res) => {
  try {
    const userId = parseInt(req.user.id);
    const db = getDB();

    const [transfers] = await db.execute(`
      SELECT 
        t.*,
        from_user.username as from_username,
        from_user.real_name as from_real_name
      FROM transfers t
      LEFT JOIN users from_user ON t.from_user_id = from_user.id
      WHERE t.to_user_id = ? AND t.status = 'pending'
      ORDER BY t.created_at DESC
    `, [userId]);

    res.json({ success: true, data: transfers });
  } catch (error) {
    console.error('获取待确认转账失败:', error);
    res.status(500).json({ success: false, message: '服务器错误' });
  }
});

// 获取当前用户账户信息（不需要传递用户ID）
router.get('/account', authenticateToken, async (req, res) => {
  try {
    const userId = req.user.id;

    const db = getDB();
    const [user] = await db.execute(`
      SELECT id, username, real_name, balance, created_at, updated_at, points
      FROM users
      WHERE id = ?
    `, [userId]);

    if (user.length === 0) {
      return res.status(404).json({ success: false, message: '用户不存在' });
    }

    // 返回用户账户信息，格式与原来的 accounts 表保持一致
    const accountData = {
      id: user[0].id,
      user_id: user[0].id,
      account_type: 'user',
      balance: user[0].balance,
      username: user[0].username,
      real_name: user[0].real_name,
      created_at: user[0].created_at,
      updated_at: user[0].updated_at,
      points: user[0].points
    };

    res.json({ success: true, data: accountData });
  } catch (error) {
    console.error('获取账户信息失败:', error);
    res.status(500).json({ success: false, message: '服务器错误' });
  }
});

// 获取指定用户账户信息（管理员权限或用户本人）
router.get('/account/:userId', authenticateToken, async (req, res) => {
  try {
    const userId = req.params.userId;

    // 检查权限
    if (req.user.id != userId && req.user.role !== 'admin') {
      return res.status(403).json({ success: false, message: '权限不足' });
    }

    const db = getDB();
    const [user] = await db.execute(`
      SELECT id, username, real_name, balance, created_at, updated_at
      FROM users
      WHERE id = ?
    `, [userId]);

    if (user.length === 0) {
      return res.status(404).json({ success: false, message: '用户不存在' });
    }

    // 返回用户账户信息，格式与原来的 accounts 表保持一致
    const accountData = {
      id: user[0].id,
      user_id: user[0].id,
      account_type: 'user',
      balance: user[0].balance,
      username: user[0].username,
      real_name: user[0].real_name,
      created_at: user[0].created_at,
      updated_at: user[0].updated_at
    };

    res.json({ success: true, data: accountData });
  } catch (error) {
    console.error('获取账户信息失败:', error);
    res.status(500).json({ success: false, message: '服务器错误' });
  }
});

// 获取转账趋势数据（管理员权限）
router.get('/trend', authenticateToken, async (req, res) => {
  try {
    // 检查管理员权限
    if (req.user.role !== 'admin') {
      return res.status(403).json({ success: false, message: '权限不足' });
    }
    
    const db = getDB();
    const { days = 7 } = req.query;
    const daysNum = Math.min(30, Math.max(1, parseInt(days) || 7));
    
    // 首先获取数据库中最早和最晚的转账日期
    const [dateRange] = await db.execute(`
      SELECT 
        MIN(DATE(created_at)) as min_date,
        MAX(DATE(created_at)) as max_date,
        COUNT(*) as total_count
      FROM transfers
    `);
    
    if (dateRange[0].total_count === 0) {
      // 如果没有转账记录，返回空数据
      const result = [];
      const now = new Date();
      
      for (let i = daysNum - 1; i >= 0; i--) {
      const date = dayjs().subtract(i, 'day');
      result.push({
        date: date.format('MM-DD'),
        count: 0,
        amount: 0
      });
    }
      
      return res.json({
        success: true,
        data: result
      });
    }
    
    // 获取最近的转账数据（基于实际数据的最大日期）
    const maxDate = dayjs(dateRange[0].max_date);
    
    // 获取指定天数内的转账趋势（从最大日期往前推）
    const [trendData] = await db.execute(`
      SELECT 
        DATE(created_at) as date,
        COUNT(*) as count,
        SUM(amount) as amount
      FROM transfers 
      WHERE DATE(created_at) >= DATE_SUB(?, INTERVAL ? DAY)
        AND status IN ('confirmed', 'received')
      GROUP BY DATE(created_at)
      ORDER BY date ASC
    `, [dateRange[0].max_date, daysNum - 1]);
    
    // 填充缺失的日期（转账数为0）
    const result = [];
    
    for (let i = daysNum - 1; i >= 0; i--) {
      const date = maxDate.subtract(i, 'day');
      const dateStr = date.format('YYYY-MM-DD');
      
      // 修复日期比较：将数据库返回的Date对象转换为字符串进行比较
      const existingData = trendData.find(item => {
        const itemDateStr = dayjs(item.date).format('YYYY-MM-DD');
        return itemDateStr === dateStr;
      });
      
      result.push({
        date: date.format('MM-DD'),
        count: existingData ? existingData.count : 0,
        amount: existingData ? parseFloat(existingData.amount) : 0
      });
    }
    
    res.json({
      success: true,
      data: result
    });
  } catch (error) {
    console.error('获取转账趋势错误:', error);
    res.status(500).json({ success: false, message: '获取转账趋势失败' });
  }
});

// 管理员解除坏账（管理员权限）
router.post('/remove-bad-debt/:transferId', authenticateToken, async (req, res) => {
  try {
    // 检查管理员权限
    if (req.user.role !== 'admin') {
      return res.status(403).json({ success: false, message: '权限不足' });
    }
    
    const { transferId } = req.params;
    const { reason } = req.body;
    const adminId = req.user.id;
    
    // 验证转账ID
    if (!transferId || isNaN(transferId)) {
      return res.status(400).json({ success: false, message: '无效的转账ID' });
    }
    
    const result = await transferService.removeBadDebt(transferId, adminId, reason);
    
    res.json({
      success: true,
      message: '坏账标记已解除',
      data: result
    });
  } catch (error) {
    console.error('解除坏账失败:', error);
    if (error.statusCode) {
      return res.status(error.statusCode).json({ 
        success: false, 
        message: error.message 
      });
    }
    res.status(500).json({ success: false, message: '解除坏账失败' });
  }
});

// 强制变更转账状态（管理员权限）
router.post('/force-change-status/:transferId', authenticateToken, async (req, res) => {
  try {
    // 检查管理员权限
    if (req.user.role !== 'admin') {
      return res.status(403).json({ success: false, message: '权限不足' });
    }
    
    const { transferId } = req.params;
    const { newStatus, status, reason, adjust_balance = false } = req.body;
    // 兼容两种参数名：newStatus 和 status
    const actualNewStatus = newStatus || status;
    const adminId = req.user.id;
    
    // 验证转账ID
    if (!transferId || isNaN(transferId)) {
      return res.status(400).json({ success: false, message: '无效的转账ID' });
    }
    
    // 验证必填参数
    if (!actualNewStatus) {
      return res.status(400).json({ success: false, message: '新状态不能为空' });
    }
    
    if (!reason) {
      return res.status(400).json({ success: false, message: '变更原因不能为空' });
    }
    
    const result = await transferService.forceChangeTransferStatus(
      transferId, 
      actualNewStatus, 
      reason, 
      adminId, 
      adjust_balance
    );
    
    res.json({
      success: true,
      message: `转账状态已从 ${result.oldStatus} 变更为 ${result.newStatus}`,
      data: result
    });
  } catch (error) {
    console.error('强制变更转账状态失败:', error);
    if (error.statusCode) {
      return res.status(error.statusCode).json({ 
        success: false, 
        message: error.message 
      });
    }
    res.status(500).json({ success: false, message: '变更转账状态失败' });
  }
});

// 管理员查看数据库连接状态
router.get('/admin/database/status', authenticateToken, async (req, res) => {
  try {
    // 检查管理员权限
    if (req.user.role !== 'admin') {
      return res.status(403).json({ success: false, message: '权限不足' });
    }
    
    const dbMonitor = require('../db-monitor');
    const diagnosis = await dbMonitor.diagnose();
    
    res.json({
      success: true,
      data: diagnosis
    });
  } catch (error) {
    logger.error('Get database status failed', {
      adminId: req.user.id,
      error: error.message
    });
    res.status(500).json({
      success: false,
      message: '获取数据库状态失败: ' + error.message
    });
  }
});

// 管理员获取数据库监控报告
router.get('/admin/database/report', authenticateToken, async (req, res) => {
  try {
    // 检查管理员权限
    if (req.user.role !== 'admin') {
      return res.status(403).json({ success: false, message: '权限不足' });
    }
    
    const dbMonitor = require('../db-monitor');
    const report = await dbMonitor.generateReport();
    
    res.json({
      success: true,
      data: {
        report,
        timestamp: new Date().toISOString()
      }
    });
  } catch (error) {
    logger.error('Get database report failed', {
      adminId: req.user.id,
      error: error.message
    });
    res.status(500).json({
      success: false,
      message: '获取数据库报告失败: ' + error.message
    });
  }
});

/**
 * 获取待处理的匹配转账订单
 * @param {number} page - 页码
 * @param {number} limit - 每页数量
 * @param {string} status - 状态过滤
 * @param {string} search - 搜索关键词（用户名或真实姓名）
 * @param {string} sort - 排序字段
 * @param {string} order - 排序方向（asc/desc）
 */
router.get('/pending-allocations', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      // 检查管理员权限
      if (req.user.role !== 'admin') {
        return res.status(403).json({ success: false, message: '权限不足' });
      }

      const { 
        page = 1, 
        limit = 20, 
        status = '', 
        search = '', 
        sort = 'created_at', 
        order = 'desc' 
      } = req.query;

      const db = getDB();
      const offset = (parseInt(page) - 1) * parseInt(limit);
      
      // 构建查询条件
      let whereConditions = [];
      let queryParams = [];
      
      // 状态过滤
      if (status) {
        whereConditions.push('oa.status = ?');
        queryParams.push(status);
      }
      
      // 搜索过滤（用户名或真实姓名）
      if (search) {
        whereConditions.push('(uf.username LIKE ? OR uf.real_name LIKE ? OR ut.username LIKE ? OR ut.real_name LIKE ?)');
        const searchPattern = `%${search}%`;
        queryParams.push(searchPattern, searchPattern, searchPattern, searchPattern);
      }
      
      const whereClause = whereConditions.length > 0 ? 'WHERE ' + whereConditions.join(' AND ') : '';
      
      // 验证排序字段
      const allowedSortFields = ['created_at', 'amount', 'status', 'cycle_number'];
      const sortField = allowedSortFields.includes(sort) ? sort : 'created_at';
      const sortOrder = order.toLowerCase() === 'asc' ? 'ASC' : 'DESC';
      
      // 获取总数
      const countQuery = `
        SELECT COUNT(*) as total
        FROM transfers oa
        JOIN users uf ON oa.from_user_id = uf.id
        JOIN users ut ON oa.to_user_id = ut.id
        JOIN matching_orders mo ON oa.id = mo.id
        ${whereClause}
      `;
      
      const [countResult] = await db.execute(countQuery, queryParams);
      const total = countResult[0].total;
      
      // 使用 query 方法避免 LIMIT/OFFSET 参数问题
      const dataQuery = `
        SELECT 
          oa.id,
          oa.from_user_id,
          oa.to_user_id,
          oa.amount,
          oa.cycle_number,
          oa.status,
          oa.outbound_date,
          oa.return_date,
          oa.can_return_after,
          oa.confirmed_at,
          oa.created_at,
          oa.updated_at,
          uf.username as from_username,
          uf.real_name as from_real_name,
          ut.username as to_username,
          ut.real_name as to_real_name,
          mo.amount as order_total_amount,
          mo.status as order_status,
          mo.matching_type,
          t.status as transfer_status,
          t.voucher_url
        FROM transfers oa
        JOIN users uf ON oa.from_user_id = uf.id
        JOIN users ut ON oa.to_user_id = ut.id
        JOIN matching_orders mo ON oa.id = mo.id
        ${whereClause}
        ORDER BY oa.${sortField} ${sortOrder}
        LIMIT ${parseInt(limit)} OFFSET ${parseInt(offset)}
      `;
      
      const [allocations] = queryParams.length > 0 
        ? await db.execute(dataQuery, queryParams)
        : await db.query(dataQuery);
      
      // 计算分页信息
      const totalPages = Math.ceil(total / parseInt(limit));
      
      logger.info('Pending allocations list requested', {
        userId: req.user.id,
        page: parseInt(page),
        limit: parseInt(limit),
        total,
        resultCount: allocations.length
      });
      
      res.json({
        success: true,
        data: {
          allocations,
          pagination: {
            page: parseInt(page),
            limit: parseInt(limit),
            total,
            totalPages
          }
        }
      });
    } catch (error) {
      logger.error('Get pending allocations failed', {
        userId: req.user.id,
        error: error.message
      });
      next(error);
    }
  }
);

/**
 * 获取待处理匹配订单的统计信息
 */
router.get('/pending-allocations/stats', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      // 检查管理员权限
      if (req.user.role !== 'admin') {
        return res.status(403).json({ success: false, message: '权限不足' });
      }

      const db = getDB();
      
      // 获取统计数据
      const [stats] = await db.execute(`
        SELECT 
          COUNT(*) as total_allocations,
          COUNT(CASE WHEN oa.status = 'pending' THEN 1 END) as pending_count,
          COUNT(CASE WHEN oa.status = 'confirmed' THEN 1 END) as confirmed_count,
          COUNT(CASE WHEN oa.status = 'completed' THEN 1 END) as completed_count,
          SUM(oa.amount) as total_amount,
          SUM(CASE WHEN oa.status = 'pending' THEN oa.amount ELSE 0 END) as pending_amount
        FROM transfers oa
        JOIN matching_orders mo ON oa.id = mo.id
        WHERE mo.status != 'cancelled'
      `);
      
      res.json({
        success: true,
        data: stats[0]
      });
    } catch (error) {
      logger.error('Get pending allocations stats failed', {
        userId: req.user.id,
        error: error.message
      });
      next(error);
    }
  }
);

/**
 * 获取昨日用户转账统计列表
 */
router.get('/daily-stats', 
  authenticateToken, 
  async (req, res, next) => {
    try {
      // 检查管理员权限
      if (req.user.role !== 'admin') {
        return res.status(403).json({ success: false, message: '权限不足' });
      }

      const db = getDB();
      
      // 获取昨日和今日的日期范围（从0点开始计算）
      // 今日0点到23:59:59
      const todayStart = dayjs().startOf('day');
      const todayEnd = dayjs().endOf('day');
      
      // 昨日0点到23:59:59
      const yesterdayStart = dayjs().subtract(1, 'day').startOf('day');
      const yesterdayEnd = dayjs().subtract(1, 'day').endOf('day');
      
      // 转换为MySQL兼容的字符串格式
      const todayStartStr = todayStart.format('YYYY-MM-DD HH:mm:ss');
      const todayEndStr = todayEnd.format('YYYY-MM-DD HH:mm:ss');
      const yesterdayStartStr = yesterdayStart.format('YYYY-MM-DD HH:mm:ss');
      const yesterdayEndStr = yesterdayEnd.format('YYYY-MM-DD HH:mm:ss');
      
      // 使用dayjs格式化日期字符串用于返回
      const todayStr = todayStart.format('YYYY-MM-DD');
      const yesterdayStr = yesterdayStart.format('YYYY-MM-DD');
      
      // 获取所有用户的昨日转出和今日入账统计
      let [userStats] = await db.execute(`
        SELECT 
          u.id as user_id,
          u.username,
          u.real_name,
          u.phone,
          u.balance,
          COALESCE(yesterday_out.amount, 0) as yesterday_out_amount,
          COALESCE(today_in.amount, 0) as today_in_amount,
          CASE 
            WHEN (COALESCE(yesterday_out.amount, 0) - COALESCE(today_in.amount, 0)) > ABS(u.balance) 
            THEN ABS(u.balance)
            ELSE (COALESCE(yesterday_out.amount, 0) - COALESCE(today_in.amount, 0))
          END as balance_needed
        FROM users u
        LEFT JOIN (
          SELECT 
            from_user_id,
            SUM(amount) as amount
          FROM transfers 
          WHERE created_at >= ? AND created_at <= ?
            AND status IN ('confirmed', 'received')
          GROUP BY from_user_id
        ) yesterday_out ON u.id = yesterday_out.from_user_id
        LEFT JOIN (
          SELECT 
            to_user_id,
            SUM(amount) as amount
          FROM transfers 
          WHERE created_at >= ? AND created_at <= ?
            AND status IN ('confirmed', 'received')
          GROUP BY to_user_id
        ) today_in ON u.id = today_in.to_user_id
        WHERE u.role != 'admin' 
          AND u.is_system_account != 1
          AND yesterday_out.amount > 0
          AND u.balance < 0
        ORDER BY balance_needed DESC, yesterday_out_amount DESC
      `, [yesterdayStartStr, yesterdayEndStr, todayStartStr, todayEndStr]);
      userStats = userStats.filter(item=>item.balance_needed >= 100)
      res.json({
        success: true,
        data: {
          date: {
            yesterday: yesterdayStr,
            today: todayStr
          },
          users: userStats
        }
      });
    } catch (error) {
      logger.error('Get daily transfer stats failed', {
        userId: req.user.id,
        error: error.message
      });
      next(error);
    }
  }
);

module.exports = router;