const express = require('express');
const router = express.Router();
const dbConnector = require('../utils/dbConnector');

// 获取用户推广信息
router.get('/info', async (req, res) => {
  try {
    const userId = req.user.id;
    
    // 获取或创建推广信息
    let promotion = await dbConnector.query(
      'SELECT * FROM promotions WHERE user_id = ?',
      [userId]
    );
    
    if (promotion.length === 0) {
      // 创建新的推广信息
      const promotionCode = generatePromotionCode(userId);
      await dbConnector.query(
        `INSERT INTO promotions 
         (user_id, promotion_code, total_invites, successful_orders, total_earnings, available_balance, withdrawn_amount, created_at, updated_at) 
         VALUES (?, ?, 0, 0, 0, 0, 0, NOW(), NOW())`,
        [userId, promotionCode]
      );
      
      promotion = await dbConnector.query(
        'SELECT * FROM promotions WHERE user_id = ?',
        [userId]
      );
    }
    
    // 生成推广链接和二维码（这里简化处理，实际项目中需要生成真实二维码）
    const promotionInfo = {
      promotion_code: promotion[0].promotion_code,
      qr_code_url: `/uploads/qrcodes/promo_${promotion[0].promotion_code}.png`,
      promotion_url: `https://aijianhua.com/promo/${promotion[0].promotion_code}`,
      total_invites: promotion[0].total_invites,
      successful_orders: promotion[0].successful_orders,
      total_earnings: promotion[0].total_earnings,
      available_balance: promotion[0].available_balance,
      withdrawn_amount: promotion[0].withdrawn_amount
    };
    
    res.json({
      code: 200,
      message: '获取成功',
      data: promotionInfo
    });
  } catch (error) {
    console.error('获取推广信息失败:', error);
    res.status(500).json({
      code: 500,
      message: '服务器内部错误',
      error: error.message
    });
  }
});

// 获取推广记录
router.get('/records', async (req, res) => {
  try {
    const userId = req.user.id;
    const { page = 1, limit = 10, type } = req.query;
    const offset = (page - 1) * limit;
    
    let query = `
      SELECT 'invite' as type, u.username as user_name, u.phone, 
             NULL as order_amount, 10.0 as amount, 'completed' as status, u.created_at
      FROM users u
      WHERE u.invited_by = ?
    `;
    
    let countQuery = 'SELECT COUNT(*) as count FROM users WHERE invited_by = ?';
    let queryParams = [userId];
    
    if (type === 'order_commission') {
      query = `
        SELECT 'order_commission' as type, u.username as user_name, u.phone,
               o.total_amount as order_amount, o.total_amount * 0.1 as amount,
               'pending' as status, o.created_at
        FROM orders o
        JOIN users u ON o.user_id = u.id
        WHERE u.invited_by = ? AND o.payment_status = 1
      `;
      countQuery = `
        SELECT COUNT(*) as count 
        FROM orders o 
        JOIN users u ON o.user_id = u.id 
        WHERE u.invited_by = ? AND o.payment_status = 1
      `;
    }
    
    query += ' ORDER BY created_at DESC LIMIT ? OFFSET ?';
    queryParams.push(parseInt(limit), parseInt(offset));
    
    const records = await dbConnector.query(query, queryParams);
    const countResult = await dbConnector.query(countQuery, [userId]);
    const total = countResult[0].count;
    
    res.json({
      code: 200,
      message: '获取成功',
      data: {
        records: records,
        pagination: {
          page: parseInt(page),
          limit: parseInt(limit),
          total: total,
          pages: Math.ceil(total / limit)
        }
      }
    });
  } catch (error) {
    console.error('获取推广记录失败:', error);
    res.status(500).json({
      code: 500,
      message: '服务器内部错误',
      error: error.message
    });
  }
});

// 申请提现
router.post('/withdraw', async (req, res) => {
  try {
    const { amount, payment_method, account_info } = req.body;
    const userId = req.user.id;
    
    // 检查可用余额
    const promotion = await dbConnector.query(
      'SELECT available_balance FROM promotions WHERE user_id = ?',
      [userId]
    );
    
    if (promotion.length === 0 || promotion[0].available_balance < amount) {
      return res.status(400).json({
        code: 2001,
        message: '可提现余额不足'
      });
    }
    
    // 检查最小提现金额
    if (amount < 50) {
      return res.status(400).json({
        code: 2001,
        message: '提现金额不能少于50元'
      });
    }
    
    // 创建提现记录
    const result = await dbConnector.query(
      `INSERT INTO withdrawals 
       (user_id, amount, payment_method, account_info, status, created_at, updated_at) 
       VALUES (?, ?, ?, ?, 'pending', NOW(), NOW())`,
      [userId, amount, payment_method, account_info]
    );
    
    // 更新可用余额
    await dbConnector.query(
      'UPDATE promotions SET available_balance = available_balance - ?, updated_at = NOW() WHERE user_id = ?',
      [amount, userId]
    );
    
    res.json({
      code: 200,
      message: '提现申请已提交',
      data: {
        withdraw_id: result.insertId,
        amount: amount,
        status: 'processing',
        estimated_arrival: new Date(Date.now() + 2 * 24 * 60 * 60 * 1000).toISOString() // 2天后
      }
    });
  } catch (error) {
    console.error('申请提现失败:', error);
    res.status(500).json({
      code: 500,
      message: '服务器内部错误',
      error: error.message
    });
  }
});

// 获取提现记录
router.get('/withdrawals', async (req, res) => {
  try {
    const userId = req.user.id;
    const { page = 1, limit = 10 } = req.query;
    const offset = (page - 1) * limit;
    
    const withdrawals = await dbConnector.query(
      `SELECT id, amount, payment_method, account_info, status, transaction_id, completed_at, created_at
       FROM withdrawals 
       WHERE user_id = ? 
       ORDER BY created_at DESC 
       LIMIT ? OFFSET ?`,
      [userId, parseInt(limit), parseInt(offset)]
    );
    
    const countResult = await dbConnector.query(
      'SELECT COUNT(*) as count FROM withdrawals WHERE user_id = ?',
      [userId]
    );
    const total = countResult[0].count;
    
    res.json({
      code: 200,
      message: '获取成功',
      data: {
        withdrawals: withdrawals,
        pagination: {
          page: parseInt(page),
          limit: parseInt(limit),
          total: total,
          pages: Math.ceil(total / limit)
        }
      }
    });
  } catch (error) {
    console.error('获取提现记录失败:', error);
    res.status(500).json({
      code: 500,
      message: '服务器内部错误',
      error: error.message
    });
  }
});

// 生成推广码
function generatePromotionCode(userId) {
  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  let code = 'PROMO';
  for (let i = 0; i < 6; i++) {
    code += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return code + userId.toString().padStart(4, '0');
}

module.exports = router;