class ConnectionStatus {
  static const int idle = 0;
  static const int connected = 1;
  static const int disconnected = 2;
  static const int connecting = 3;
  static const int failure = 4;
}

class ConversationType {
  static const int unknown = 0;
  static const int private = 1;
  static const int group = 2;
  static const int chatroom = 3;
  static const int system = 4;
}

class PullDirection {
  static const int newer = 0;
  static const int older = 1;
}

class MessageDirection {
  static int send = 1;
  static int receive = 2;
}

class MessageState {
  static int unknown = 0;
  static int sending = 1;
  static int sent = 2;
  static int fail = 3;
  static int uploading = 4;
}

class CallStatus {
  static const int idle = 0;
  static const int incoming = 1;
  static const int outgoing = 2;
  static const int connecting = 3;
  static const int connected = 4;
}

class CallMediaType {
  static const int voice = 0;
  static const int video = 1;
}

class CallFinishReason {
  /// 未知原因
  static const int unknown = 0;
  /// 当前用户挂断已接通的来电
  static const int hangup = 1;
  /// 当前用户拒接来电
  static const int decline = 2;
  /// 当前用户忙线
  static const int busy = 3;
  /// 当前用户未接听
  static const int noResponse = 4;
  /// 当前用户取消呼叫
  static const int cancel = 5;
  /// 对端用户挂断已接通的来电
  static const int otherSideHangup = 6;
  /// 对端用户拒接来电
  static const int otherSideDecline = 7;
  /// 对端用户忙线
  static const int otherSideBusy = 8;
  /// 对端用户未接听
  static const int otherSideNoResponse = 9;
  /// 对端用户取消呼叫
  static const int otherSideCancel = 10;
  /// 房间被销毁
  static const int roomDestroy = 11;
  /// 网络出错
  static const int networkError = 12;
  /// 当前用户在其它端接听来电
  static const int acceptOnOtherClient = 13;
  /// 当前用户在其它端挂断来电
  static const int hangupOnOtherClient = 14;
}