const express = require('express');
const router = express.Router();
const { getDB } = require('../../database');
const bcrypt = require('bcryptjs');
const { auth, adminAuth } = require('../../middleware/auth');

// 创建管理员认证中间件组合
const authenticateAdmin = [auth, adminAuth];

// 获取数据库连接
const db = {
  query: async (sql, params = []) => {
    const connection = getDB();
    const [rows] = await connection.execute(sql, params);
    return rows;
  }
};

// 获取代理列表和统计信息
router.get('/', authenticateAdmin, async (req, res) => {
  try {
    const { page = 1, limit = 20, status, city, search } = req.query;
    const pageNum = parseInt(page) || 1;
    const limitNum = parseInt(limit) || 20;
    const offset = (pageNum - 1) * limitNum;
    
    // 构建查询条件
    let whereConditions = [];
    let queryParams = [];
    
    if (status) {
      whereConditions.push('ra.status = ?');
      queryParams.push(status);
    }
    
    if (city) {
      whereConditions.push('zr.city_name = ?');
      queryParams.push(city);
    }
    
    if (search) {
      whereConditions.push('(ra.real_name LIKE ? OR ra.phone LIKE ?)');
      queryParams.push(`%${search}%`, `%${search}%`);
    }
    
    const whereClause = whereConditions.length > 0 ? `WHERE ${whereConditions.join(' AND ')}` : '';
    
    // 查询代理列表
    const agentsQuery = `
      SELECT 
        ra.*,
        u.real_name,
        u.phone,
        u.id_card,
        zr.city_name,
        zr.district_name,
        (
          SELECT COUNT(DISTINCT merchant_id) 
          FROM agent_merchants 
          WHERE agent_id = ra.id
        ) as merchant_count,
        (
          SELECT CAST(COALESCE(SUM(commission_amount), 0) AS DECIMAL(10,2)) 
          FROM agent_commission_records 
          WHERE agent_id = ra.id
        ) as total_commission,
        0 as paid_commission,
        (
          SELECT CAST(COALESCE(SUM(commission_amount), 0) AS DECIMAL(10,2)) 
          FROM agent_commission_records 
          WHERE agent_id = ra.id
        ) as pending_commission
      FROM regional_agents ra
      LEFT JOIN users u ON ra.user_id = u.id
      LEFT JOIN zhejiang_regions zr ON ra.region_id = zr.id
      ${whereClause}
      ORDER BY ra.created_at DESC
      LIMIT ${limitNum} OFFSET ${offset}
    `;

    const agents = await db.query(agentsQuery, queryParams);
    
    // 查询总数
    const countQuery = `
      SELECT COUNT(DISTINCT ra.id) as total
      FROM regional_agents ra
      LEFT JOIN users u ON ra.user_id = u.id
      LEFT JOIN zhejiang_regions zr ON ra.region_id = zr.id
      ${whereClause}
    `;
    
    const totalResult = await db.query(countQuery, queryParams);
    const total = totalResult && totalResult.length > 0 ? totalResult[0].total : 0;
    
    // 查询统计信息
    const statsQuery = `
      SELECT 
        COUNT(*) as total_agents,
        COUNT(CASE WHEN status = 'pending' THEN 1 END) as pending_agents,
        COUNT(CASE WHEN status = 'active' THEN 1 END) as active_agents,
        CAST(COALESCE(SUM(commission_stats.total_commission), 0) AS DECIMAL(10,2)) as total_commission
      FROM regional_agents ra
      LEFT JOIN (
        SELECT 
          agent_id,
          SUM(commission_amount) as total_commission
        FROM agent_commission_records
        GROUP BY agent_id
      ) commission_stats ON ra.id = commission_stats.agent_id
    `;
    
    const statsResult = await db.query(statsQuery);
    const stats = statsResult && statsResult.length > 0 ? statsResult[0] : {
      total_agents: 0,
      pending_agents: 0,
      active_agents: 0,
      total_commission: 0
    };
    
    res.json({
      success: true,
      data: {
        agents,
        total: parseInt(total),
        stats
      }
    });
  } catch (error) {
    console.error('获取代理列表失败:', error);
    res.status(500).json({ success: false, message: '获取代理列表失败' });
  }
});

// 获取代理详情
router.get('/:id', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    
    const agentQuery = `
      SELECT 
        ra.*,
        u.real_name as name,
        u.phone,
        u.id_card,
        CONCAT(u.city, ' ', zr.district_name) as address,
        zr.city_name,
        zr.district_name,
        (
          SELECT COUNT(DISTINCT merchant_id) 
          FROM agent_merchants 
          WHERE agent_id = ra.id
        ) as merchant_count,
        (
          SELECT COALESCE(SUM(commission_amount), 0) 
          FROM agent_commission_records 
          WHERE agent_id = ra.id
        ) as total_commission,
        0 as paid_commission,
        (
          SELECT COALESCE(SUM(commission_amount), 0) 
          FROM agent_commission_records 
          WHERE agent_id = ra.id
        ) as pending_commission
      FROM regional_agents ra
      LEFT JOIN users u ON ra.user_id = u.id
      LEFT JOIN zhejiang_regions zr ON ra.region_id = zr.id
      WHERE ra.id = ?
    `;
    
    const agentResult = await db.query(agentQuery, [id]);
    
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在' });
    }
    
    const agent = agentResult[0];
    
    res.json({
      success: true,
      data: agent
    });
  } catch (error) {
    console.error('获取代理详情失败:', error);
    res.status(500).json({ success: false, message: '获取代理详情失败' });
  }
});

// 审核通过代理申请
router.put('/:id/approve', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { password } = req.body;
    
    if (!password || password.length < 6) {
      return res.status(400).json({ success: false, message: '密码长度不能少于6位' });
    }
    
    // 检查代理是否存在且状态为待审核
    const agents = await db.query(
      'SELECT * FROM regional_agents WHERE id = ? AND status = "pending"',
      [id]
    );
    
    if (!agents || agents.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在或状态不正确' });
    }
    
    const agent = agents[0];
    
    // 检查该区域是否已有其他激活的代理
    const existingActiveAgents = await db.query(
      'SELECT id FROM regional_agents WHERE region_id = ? AND status = "active" AND id != ?',
      [agent.region_id, id]
    );
    
    if (existingActiveAgents && existingActiveAgents.length > 0) {
      return res.status(400).json({ success: false, message: '该区域已有激活的代理，每个区域只能有一个代理账号' });
    }
    
    // 加密密码并更新用户表
    const hashedPassword = await bcrypt.hash(password, 10);
    
    // 更新用户密码
    await db.query(
      `UPDATE users SET password = ? WHERE id = (
        SELECT user_id FROM regional_agents WHERE id = ?
      )`,
      [hashedPassword, id]
    );
    
    // 更新代理状态
    await db.query(
      `UPDATE regional_agents 
       SET status = 'active', approved_at = NOW(), approved_by_admin_id = ?
       WHERE id = ?`,
      [req.user.id, id]
    );
    
    res.json({
      success: true,
      message: '代理申请已通过'
    });
  } catch (error) {
    console.error('审核代理申请失败:', error);
    res.status(500).json({ success: false, message: '审核代理申请失败' });
  }
});

// 拒绝代理申请
router.put('/:id/reject', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { reason } = req.body;
    
    if (!reason || reason.trim() === '') {
      return res.status(400).json({ success: false, message: '请输入拒绝原因' });
    }
    
    // 检查代理是否存在且状态为待审核
    const agentResult = await db.query(
      'SELECT * FROM regional_agents WHERE id = ? AND status = "pending"',
      [id]
    );
    
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在或状态不正确' });
    }
    
    const agent = agentResult[0];
    
    // 更新代理状态
    await db.query(
      `UPDATE regional_agents 
       SET status = 'rejected', reject_reason = ?, rejected_at = NOW(), rejected_by_admin_id = ?
       WHERE id = ?`,
      [reason.trim(), req.user.id, id]
    );
    
    res.json({
      success: true,
      message: '代理申请已拒绝'
    });
  } catch (error) {
    console.error('拒绝代理申请失败:', error);
    res.status(500).json({ success: false, message: '拒绝代理申请失败' });
  }
});

// 禁用代理
router.put('/:id/disable', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    
    // 检查代理是否存在且状态为激活
    const agentResult = await db.query(
      'SELECT * FROM regional_agents WHERE id = ? AND status = "active"',
      [id]
    );
    
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在或状态不正确' });
    }
    
    const agent = agentResult[0];
    
    // 更新代理状态
    await db.query(
      'UPDATE regional_agents SET status = "disabled", disabled_at = NOW() WHERE id = ?',
      [id]
    );
    
    res.json({
      success: true,
      message: '代理已禁用'
    });
  } catch (error) {
    console.error('禁用代理失败:', error);
    res.status(500).json({ success: false, message: '禁用代理失败' });
  }
});

// 启用代理
router.put('/:id/enable', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    
    // 检查代理是否存在且状态为禁用
    const agentResult = await db.query(
      'SELECT * FROM regional_agents WHERE id = ? AND status = "disabled"',
      [id]
    );
    
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在或状态不正确' });
    }
    
    const agent = agentResult[0];
    
    // 检查该区域是否已有其他激活的代理
    const existingActiveAgentResult = await db.query(
      'SELECT id FROM regional_agents WHERE region_id = ? AND status = "active" AND id != ?',
      [agent.region_id, id]
    );
    
    if (existingActiveAgentResult && existingActiveAgentResult.length > 0) {
      return res.status(400).json({ success: false, message: '该区域已有激活的代理，每个区域只能有一个代理账号' });
    }
    
    // 更新代理状态
    await db.query(
      'UPDATE regional_agents SET status = "active", disabled_at = NULL WHERE id = ?',
      [id]
    );
    
    res.json({
      success: true,
      message: '代理已启用'
    });
  } catch (error) {
    console.error('启用代理失败:', error);
    res.status(500).json({ success: false, message: '启用代理失败' });
  }
});

// 获取代理商户列表
router.get('/:id/merchants', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { page = 1, limit = 20 } = req.query;
    const pageNum = parseInt(page) || 1;
    const limitNum = parseInt(limit) || 20;
    const offset = (pageNum - 1) * limitNum;
    
    // 检查代理是否存在
    const agentResult = await db.query('SELECT * FROM regional_agents WHERE id = ?', [id]);
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在' });
    }
    const agent = agentResult[0];
    
    // 查询代理的商户列表
    const merchantsQuery = `
      SELECT 
        u.id,
        u.real_name,
        u.phone,
        u.created_at,
        am.created_at as joined_at,
        COUNT(mo.id) as match_count,
        COUNT(CASE WHEN mo.status = 'completed' THEN 1 END) as completed_matches
      FROM agent_merchants am
      JOIN users u ON am.merchant_id = u.id
      LEFT JOIN matching_orders mo ON u.id = mo.initiator_id
      WHERE am.agent_id = ?
      GROUP BY u.id, am.created_at
      ORDER BY am.created_at DESC
      LIMIT ${limitNum} OFFSET ${offset}
    `;

    const merchants = await db.query(merchantsQuery, [id]);
    
    // 查询总数
    const totalResult = await db.query(
      'SELECT COUNT(*) as total FROM agent_merchants WHERE agent_id = ?',
      [id]
    );
    const total = totalResult && totalResult.length > 0 ? totalResult[0].total : 0;
    
    res.json({
      success: true,
      data: {
        merchants,
        total: parseInt(total)
      }
    });
  } catch (error) {
    console.error('获取代理商户列表失败:', error);
    res.status(500).json({ success: false, message: '获取代理商户列表失败' });
  }
});

// 获取代理佣金记录
router.get('/:id/commissions', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { page = 1, limit = 20 } = req.query;
    const pageNum = parseInt(page) || 1;
    const limitNum = parseInt(limit) || 20;
    const offset = (pageNum - 1) * limitNum;
    
    // 检查代理是否存在
    const agentResult = await db.query('SELECT * FROM regional_agents WHERE id = ?', [id]);
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在' });
    }
    const agent = agentResult[0];
    
    // 查询佣金记录
    const commissionsQuery = `
      SELECT 
        acr.*,
        u.phone as merchant_phone
      FROM agent_commission_records acr
      JOIN users u ON acr.merchant_id = u.id
      WHERE acr.agent_id = ?
      ORDER BY acr.created_at DESC
      LIMIT ${limitNum} OFFSET ${offset}
    `;

    const commissions = await db.query(commissionsQuery, [id]);
    
    // 查询总数
    const totalResult = await db.query(
      'SELECT COUNT(*) as total FROM agent_commission_records WHERE agent_id = ?',
      [id]
    );
    const total = totalResult && totalResult.length > 0 ? totalResult[0].total : 0;
    
    res.json({
      success: true,
      data: {
        commissions,
        total: parseInt(total)
      }
    });
  } catch (error) {
    console.error('获取代理佣金记录失败:', error);
    res.status(500).json({ success: false, message: '获取代理佣金记录失败' });
  }
});

// 获取代理商户的转账记录
router.get('/:id/merchant-transfers', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { page = 1, limit = 20, merchant_id } = req.query;
    const pageNum = parseInt(page) || 1;
    const limitNum = parseInt(limit) || 20;
    const offset = (pageNum - 1) * limitNum;
    
    // 检查代理是否存在
    const agentResult = await db.query('SELECT * FROM regional_agents WHERE id = ?', [id]);
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在' });
    }
    
    // 构建查询条件
    let whereConditions = ['am.agent_id = ?'];
    let queryParams = [id];
    
    if (merchant_id) {
      whereConditions.push('t.from_user_id = ?');
      queryParams.push(merchant_id);
    }
    
    const whereClause = whereConditions.join(' AND ');
    
    // 查询商户转账记录
    const transfersQuery = `
      SELECT 
        t.id,
        t.from_user_id,
        t.to_user_id,
        t.amount,
        t.status,
        t.transfer_type,
        t.description,
        t.created_at,
        t.confirmed_at,
        from_user.real_name as from_real_name,
        CONCAT(SUBSTRING(from_user.phone, 1, 3), '****', SUBSTRING(from_user.phone, -4)) as from_phone_masked,
        to_user.real_name as to_real_name,
        CONCAT(SUBSTRING(to_user.phone, 1, 3), '****', SUBSTRING(to_user.phone, -4)) as to_phone_masked
      FROM agent_merchants am
      JOIN transfers t ON am.merchant_id = t.from_user_id
      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
      WHERE ${whereClause}
      ORDER BY t.created_at DESC
      LIMIT ${limitNum} OFFSET ${offset}
    `;
    
    const transfers = await db.query(transfersQuery, queryParams);
    
    // 查询总数
    const totalQuery = `
      SELECT COUNT(*) as total 
      FROM agent_merchants am
      JOIN transfers t ON am.merchant_id = t.from_user_id
      WHERE ${whereClause}
    `;
    const totalResult = await db.query(totalQuery, queryParams);
    const total = totalResult && totalResult.length > 0 ? totalResult[0].total : 0;
    
    res.json({
      success: true,
      data: {
        transfers,
        total: parseInt(total)
      }
    });
  } catch (error) {
    console.error('1:', error);
    res.status(500).json({ success: false, message: '1获取代理商户转账记录失败' });
  }
});

/**
 * 修改代理密码
 */
router.put('/:id/password', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { password } = req.body;
    
    if (!password || password.length < 6) {
      return res.status(400).json({ success: false, message: '密码长度不能少于6位' });
    }
    
    // 检查代理是否存在且状态为激活
    const agentResult = await db.query(
      'SELECT * FROM regional_agents WHERE id = ? AND status = "active"',
      [id]
    );
    
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在或状态不正确' });
    }
    
    // 加密新密码
    const hashedPassword = await bcrypt.hash(password, 10);
    
    // 更新用户表中的密码（与审核通过时的逻辑一致）
    await db.query(
      `UPDATE users SET password = ? WHERE id = (
        SELECT user_id FROM regional_agents WHERE id = ?
      )`,
      [hashedPassword, id]
    );
    
    res.json({
      success: true,
      message: '代理密码修改成功'
    });
  } catch (error) {
    console.error('修改代理密码失败:', error);
    res.status(500).json({ success: false, message: '修改代理密码失败' });
  }
});

/**
 * 删除代理
 */
router.delete('/:id', authenticateAdmin, async (req, res) => {
  try {
    const { id } = req.params;
    const { force = 'false' } = req.query; // 是否强制删除
    const forceDelete = force === 'true'
    
    // 检查代理是否存在
    const agentResult = await db.query(
      'SELECT * FROM regional_agents WHERE id = ?',
      [id]
    );
    
    if (!agentResult || agentResult.length === 0) {
      return res.status(404).json({ success: false, message: '代理不存在' });
    }
    
    const agent = agentResult[0];
    
    // 检查代理是否有关联的商户
    const merchantCount = await db.query(
      'SELECT COUNT(*) as count FROM agent_merchants WHERE agent_id = ?',
      [id]
    );
    
    const hasMerchants = merchantCount && merchantCount.length > 0 && merchantCount[0].count > 0;
    
    // 检查代理是否有佣金记录
    const commissionCount = await db.query(
      'SELECT COUNT(*) as count FROM agent_commission_records WHERE agent_id = ?',
      [id]
    );
    
    const hasCommissions = commissionCount && commissionCount.length > 0 && commissionCount[0].count > 0;
    
    // 如果有关联数据且不是强制删除，则提示用户
    // if ((hasMerchants || hasCommissions) && !forceDelete) {
    //   return res.status(400).json({
    //     success: false,
    //     message: '该代理存在关联数据（商户或佣金记录），请确认是否强制删除',
    //     data: {
    //       has_merchants: hasMerchants,
    //       has_commissions: hasCommissions,
    //       merchant_count: hasMerchants ? merchantCount[0].count : 0,
    //       commission_count: hasCommissions ? commissionCount[0].count : 0
    //     },
    //     require_force: true
    //   });
    // }
    
    // 开始事务删除
    const pool = getDB();
    const connection = await pool.getConnection();
    await connection.beginTransaction();
    
    try {
      // 删除代理商户关系
      if (hasMerchants) {
        await connection.execute('DELETE FROM agent_merchants WHERE agent_id = ?', [id]);
      }
      
      // 删除佣金记录（根据业务需求，可能需要保留历史记录）
      if (hasCommissions && forceDelete) {
        await connection.execute('DELETE FROM agent_commission_records WHERE agent_id = ?', [id]);
      }
      
      // 删除代理记录
      await connection.execute('DELETE FROM regional_agents WHERE id = ?', [id]);
      
      // 获取区域信息用于日志
      const [regionResult] = await connection.execute(
        'SELECT * FROM zhejiang_regions WHERE id = ?',
        [agent.region_id]
      );
      const region = regionResult && regionResult.length > 0 ? regionResult[0] : null;
      
      await connection.commit();
      
      // 记录操作日志
      const logMessage = `删除代理: ${agent.user_id} (区域: ${region ? `${region.city_name} ${region.district_name}` : '未知区域'})`;
      console.log(`管理员 ${req.user.id} 执行操作: ${logMessage}`);
      
      res.json({
        success: true,
        message: '代理删除成功',
        data: {
          deleted_agent_id: id,
          deleted_merchants: hasMerchants ? merchantCount[0].count : 0,
          deleted_commissions: (hasCommissions && forceDelete) ? commissionCount[0].count : 0
        }
      });
    } catch (error) {
      await connection.rollback();
      throw error;
    } finally {
      connection.release();
    }
  } catch (error) {
    console.error('删除代理失败:', error);
    res.status(500).json({ success: false, message: '删除代理失败' });
  }
});

/**
 * 获取可用的城市区域列表（用于代理城市更换）
 */
router.get('/available-regions', authenticateAdmin, async (req, res) => {
  try {
    // 查询所有区域，并标记是否已有激活代理
    const regionsQuery = `
      SELECT 
        zr.id,
        zr.city_name,
        zr.district_name,
        CASE 
          WHEN ra.id IS NOT NULL THEN 1 
          ELSE 0 
        END as has_active_agent,
        ra.id as agent_id,
        u.real_name as agent_name
      FROM zhejiang_regions zr
      LEFT JOIN regional_agents ra ON zr.id = ra.region_id AND ra.status = 'active'
      LEFT JOIN users u ON ra.user_id = u.id
      ORDER BY zr.city_name, zr.district_name
    `;
    
    const regions = await db.query(regionsQuery);
    
    res.json({
      success: true,
      data: regions
    });
  } catch (error) {
    console.error('获取可用区域列表失败:', error);
    res.status(500).json({ success: false, message: '获取可用区域列表失败' });
  }
});

module.exports = router;