const jwt = require('jsonwebtoken');

/**
 * JWT 验证中间件
 * 验证通过后将 { userId, username } 挂载到 req.user
 */
function authMiddleware(req, res, next) {
  const authHeader = req.headers['authorization'];
  if (!authHeader || !authHeader.startsWith('Bearer ')) {
    return res.status(401).json({ code: 401, message: '未提供 Authorization Token' });
  }

  const token = authHeader.slice(7);
  try {
    const payload = jwt.verify(token, process.env.JWT_SECRET);
    req.user = {
      userId: payload.userId,
      username: payload.username,
      name: payload.name || '',
      sex: payload.sex || '',
      isDriver: payload.isDriver || false,
      deptId: payload.deptId || 0,
      deptName: payload.deptName || '',
      roleList: payload.roleList || [],
    };
    next();
  } catch (err) {
    return res.status(401).json({ code: 401, message: 'Token 无效或已过期' });
  }
}

module.exports = authMiddleware;