const { validationResult } = require('express-validator');

/**
 * 支付控制器
 * 处理支付相关的业务逻辑
 */
class PaymentController {
  /**
   * 创建支付订单
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async createPayment(req, res) {
    try {
      // 验证请求参数
      const errors = validationResult(req);
      if (!errors.isEmpty()) {
        return res.status(400).json({
          success: false,
          message: '参数验证失败',
          errors: errors.array()
        });
      }

      const { order_id, amount, payment_method } = req.body;
      const userId = req.user.id;

      // 模拟支付创建逻辑
      const payment = {
        id: Date.now(),
        order_id,
        user_id: userId,
        amount,
        payment_method,
        status: 'pending',
        created_at: new Date().toISOString()
      };

      res.status(201).json({
        success: true,
        message: '支付订单创建成功',
        data: payment
      });
    } catch (error) {
      console.error('创建支付订单失败:', error);
      res.status(500).json({
        success: false,
        message: '创建支付订单失败',
        error: error.message
      });
    }
  }

  /**
   * 获取支付订单详情
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async getPayment(req, res) {
    try {
      const { paymentId } = req.params;

      // 模拟获取支付详情
      const payment = {
        id: paymentId,
        order_id: 1,
        user_id: req.user.id,
        amount: 100.00,
        payment_method: 'wechat',
        status: 'completed',
        created_at: new Date().toISOString()
      };

      res.json({
        success: true,
        message: '获取成功',
        data: payment
      });
    } catch (error) {
      console.error('获取支付订单失败:', error);
      res.status(500).json({
        success: false,
        message: '获取支付订单失败',
        error: error.message
      });
    }
  }

  /**
   * 查询支付状态
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async queryPaymentStatus(req, res) {
    try {
      const { paymentId } = req.params;

      // 模拟查询支付状态
      const status = {
        payment_id: paymentId,
        status: 'completed',
        updated_at: new Date().toISOString()
      };

      res.json({
        success: true,
        message: '查询成功',
        data: status
      });
    } catch (error) {
      console.error('查询支付状态失败:', error);
      res.status(500).json({
        success: false,
        message: '查询支付状态失败',
        error: error.message
      });
    }
  }

  /**
   * 处理微信支付回调
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async handleWechatCallback(req, res) {
    try {
      console.log('微信支付回调:', req.body);
      
      res.status(200).json({
        success: true,
        message: '回调处理成功'
      });
    } catch (error) {
      console.error('处理微信支付回调失败:', error);
      res.status(500).json({
        success: false,
        message: '处理回调失败'
      });
    }
  }

  /**
   * 处理支付宝支付回调
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async handleAlipayCallback(req, res) {
    try {
      console.log('支付宝支付回调:', req.body);
      
      res.status(200).json({
        success: true,
        message: '回调处理成功'
      });
    } catch (error) {
      console.error('处理支付宝支付回调失败:', error);
      res.status(500).json({
        success: false,
        message: '处理回调失败'
      });
    }
  }

  /**
   * 创建退款
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async createRefund(req, res) {
    try {
      const errors = validationResult(req);
      if (!errors.isEmpty()) {
        return res.status(400).json({
          success: false,
          message: '参数验证失败',
          errors: errors.array()
        });
      }

      const { paymentId } = req.params;
      const { amount, reason } = req.body;

      // 模拟创建退款
      const refund = {
        id: Date.now(),
        payment_id: paymentId,
        amount,
        reason,
        status: 'pending',
        created_at: new Date().toISOString()
      };

      res.status(201).json({
        success: true,
        message: '退款申请创建成功',
        data: refund
      });
    } catch (error) {
      console.error('创建退款失败:', error);
      res.status(500).json({
        success: false,
        message: '创建退款失败',
        error: error.message
      });
    }
  }

  /**
   * 获取退款详情
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async getRefund(req, res) {
    try {
      const { refundId } = req.params;

      // 模拟获取退款详情
      const refund = {
        id: refundId,
        payment_id: 1,
        amount: 50.00,
        reason: '商品质量问题',
        status: 'completed',
        created_at: new Date().toISOString()
      };

      res.json({
        success: true,
        message: '获取成功',
        data: refund
      });
    } catch (error) {
      console.error('获取退款详情失败:', error);
      res.status(500).json({
        success: false,
        message: '获取退款详情失败',
        error: error.message
      });
    }
  }

  /**
   * 处理退款
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async processRefund(req, res) {
    try {
      const { refundId } = req.params;
      const { action } = req.body;

      // 模拟处理退款
      const result = {
        refund_id: refundId,
        action,
        status: action === 'approve' ? 'approved' : 'rejected',
        processed_at: new Date().toISOString()
      };

      res.json({
        success: true,
        message: '退款处理成功',
        data: result
      });
    } catch (error) {
      console.error('处理退款失败:', error);
      res.status(500).json({
        success: false,
        message: '处理退款失败',
        error: error.message
      });
    }
  }

  /**
   * 获取支付统计
   * @param {Object} req - 请求对象
   * @param {Object} res - 响应对象
   */
  static async getPaymentStatistics(req, res) {
    try {
      // 模拟支付统计数据
      const statistics = {
        total_payments: 1250,
        total_amount: 125000.00,
        successful_payments: 1200,
        failed_payments: 50,
        refund_count: 25,
        refund_amount: 2500.00,
        payment_methods: {
          wechat: 600,
          alipay: 500,
          balance: 100
        }
      };

      res.json({
        success: true,
        message: '获取成功',
        data: statistics
      });
    } catch (error) {
      console.error('获取支付统计失败:', error);
      res.status(500).json({
        success: false,
        message: '获取支付统计失败',
        error: error.message
      });
    }
  }
}

module.exports = PaymentController;