class Session
  {
    /// <summary>
    /// 缓存hashtable
    /// </summary>
    private static Hashtable mDic = new Hashtable();
    /// <summary>
    /// 添加
    /// </summary>
    /// <param name="key">key</param>
    /// <param name="value">value</param>
    public static void Add(string key, object value)
    {
      mDic[key] = value;
    }
    /// <summary>
    /// 移除
    /// </summary>
    /// <param name="key">key</param>
    public static void Remove(string key)
    {
      if (Contains(key))
      {
        mDic.Remove(key);
      }
    }
    /// <summary>
    /// 设置值
    /// </summary>
    /// <param name="key"></param>
    /// <param name="value"></param>
    public static void Set(string key, object value)
    {
      mDic[key] = value;
    }
    /// <summary>
    /// 获取值
    /// </summary>
    /// <param name="key"></param>
    /// <returns></returns>
    public static object Get(string key)
    {
      return mDic[key];
    }
    /// <summary>
    /// 是否含有
    /// </summary>
    /// <param name="key">key</param>
    /// <returns>bool</returns>
    public static bool Contains(string key)
    {
      return mDic.ContainsKey(key);
    }
    /// <summary>
    /// 清空所有项
    /// </summary>
    public static void Clear()
    {
      mDic.Clear();
    }
  }

/// <summary>
  /// 操作类型
  /// </summary>
  enum Operation
  {
    /// <summary>
    /// 认证
    /// </summary>
    Auth,
    /// <summary>
    /// 添加用户
    /// </summary>
    CreateUser
  }

/// <summary>
  /// 操作过程
  /// </summary>
  enum OperationStage
  {
    /// <summary>
    /// 默认
    /// </summary>
    Default,
    /// <summary>
    /// 第一步
    /// </summary>
    First,
    /// <summary>
    /// 第二步
    /// </summary>
    Second,
    /// <summary>
    /// 第三步
    /// </summary>
    Third
  }

class SessionItem
  {
    /// <summary>
    /// 操作类型
    /// </summary>
    public Operation Oper { get; set; }
    /// <summary>
    /// 当前步骤
    /// </summary>
    public OperationStage Stage { get; set; }
    /// <summary>
    /// 数据对象
    /// </summary>
    public object Data { get; set; }
    /// <summary>
    /// 是否自动删除
    /// </summary>
    public bool AutoRemove
    {
      get;
      set;
    }
    /// <summary>
    /// 最后更新时间
    /// </summary>
    public DateTime UpdateTime { get; set; }
  }

class AuthSessionItem
  {
    /// <summary>
    /// 用户名
    /// </summary>
    public string FromUserName { get; set; }
    /// <summary>
    /// 账号
    /// </summary>
    public string Code { get; set; }
    /// <summary>
    /// 唯一标识
    /// </summary>
    public string ID { get; set; }
  }

/// <summary>
    /// 认证用户信息
    /// </summary>
    /// <param name="tm"></param>
    /// <returns></returns>
    private bool Auth(TextMessage tm, ref string response)
    {
      SessionItem sessionItem = null;
      if (string.Equals(tm.Content, "Auth", StringComparison.OrdinalIgnoreCase))
      {
        //检查是否已经认证,业务组件验证
        if (UserManager.IsAuth(tm.FromUserName))
        {
          //如果已经认证，提示
          tm.Content = "您已经认证过了，无需再次认证！";          
        }
        else
        {
          AuthSessionItem authSessionItem = new AuthSessionItem();
          authSessionItem.FromUserName = tm.FromUserName;

          sessionItem.Oper = Operation.Auth;
          sessionItem.Stage = OperationStage.First;
          sessionItem.Data = authSessionItem;
          Session.Set(tm.FromUserName, sessionItem);

          //输入账号，并将数据和步骤，写入缓存
          tm.Content = "请输入您的个人账号";
        }

        response = ResponseText(tm);
        return false;
      }

      //从Session获取用户信息
      sessionItem = Session.Get(tm.FromUserName) as SessionItem;
      //如果会话存在，且当前操作为用户认证
      if (sessionItem != null && sessionItem.Oper == Operation.Auth)
      {
        if (sessionItem.Stage == OperationStage.First)
        {
          tm.Content = tm.Content.Trim();
          if (string.IsNullOrEmpty(tm.Content) || tm.Content.Length > 20)
          {
            tm.Content = "输入的个人账号不合法，请重新输入。";
            response = ResponseText(tm);
            return false;
          }
          AuthSessionItem authSessionItem = sessionItem.Data as AuthSessionItem;
          if (authSessionItem != null)
          {
            authSessionItem.Code = tm.Content;
          }

          //更新缓存
          sessionItem.Stage = OperationStage.Second;
          Session.Set(tm.FromUserName, sessionItem);
          tm.Content = "请输入您的员工卡号！n退出认证请输入Exit。";
          response = ResponseText(tm); 
        }
        else if (sessionItem.Stage == OperationStage.Second)
        {
          string cardNum = null;
          if (!Common.TryConvertToCardNum(tm.Content, out cardNum))
          {            
            tm.Content = "员工卡号不合法,请重新输入。n退出认证请输入Exit。";
            response = ResponseText(tm);
            return false;
          }
          AuthSessionItem authSessionItem = sessionItem.Data as AuthSessionItem;
          if (authSessionItem != null)
          {
            authSessionItem.ID = cardNum;
          }
          //认证
          string message;
          if (UserManager.Authenticate(authSessionItem, out message))
          {
            tm.Content = "祝贺您，已经认证成功，可以使用通讯录的查询功能呢。";
            //清理缓存
            Session.Remove(tm.FromUserName);
            response = ResponseText(tm);
            return true;
          }
          else if (!string.IsNullOrEmpty(message))
          {
            tm.Content = message;
          }
          else
          {
            tm.Content = "您输入的信息有误。n重新认证请输入：Auth!";
          }
          //过程结束：清理Session
          Session.Remove(tm.FromUserName);
          response = ResponseText(tm);
          return false;
        }
      }

      return false;
    }

/// <summary>
    /// 退出，并清理Session
    /// </summary>
    /// <param name="tm"></param>
    /// <param name="response"></param>
    /// <returns></returns>
    private bool Exit(TextMessage tm, ref string response)
    {
      //退出
      if (string.Equals(tm.Content, "Exit", StringComparison.OrdinalIgnoreCase))
      {
        //清除Session
        Session.Remove(tm.FromUserName);
        tm.Content = "您已退出当前操作，请执行其他操作。";
        response = ResponseText(tm);
        return true;
      }

      return false;
    }