const jwt = require('jsonwebtoken');

const auth = (req, res, next) => {
  try {
    const token = req.header('Authorization')?.replace('Bearer ', '');
    
    if (!token) {
      return res.status(401).json({
        success: false,
        message: '未提供访问令牌'
      });
    }

    const decoded = jwt.verify(token, process.env.JWT_SECRET);
    req.user = decoded;
    next();
  } catch (error) {
    res.status(401).json({
      success: false,
      message: '无效的访问令牌'
    });
  }
};

// 可选身份验证中间件
const optionalAuth = (req, res, next) => {
  try {
    const token = req.header('Authorization')?.replace('Bearer ', '');
    
    if (token) {
      const decoded = jwt.verify(token, process.env.JWT_SECRET);
      req.user = decoded;
    }
    
    next();
  } catch (error) {
    // 忽略错误，继续执行
    next();
  }
};

module.exports = { auth, optionalAuth };