/**
 Someone has joined the meeting
 @param uid   user ID
 @param meetingID  meeting ID
 @return view for displaying the video of the joiner
 */
- (UIView *)onJoined:(NSString *)uid meeting:(NSString *)meetingID
{
}
/**
 Someone has left the meeting
 @param uid  the user ID who left the meeting room
 @param meetingID  meeting ID
 */
- (void)onLeft:(NSString *)uid meeting:(NSString *)meetingID
{
}
@optional

/**
 Some abnormal conditions may cause the meeting to go wrong. Please leave the meeting room after receiving the callback.
 @param error  error information
 @param meetingID  meeting ID
 */
- (void)onMeetingError:(NSError *)error meeting:(NSString *)meetingID
{
}

/**
 The number of members has changed
 
 @param membersNumber Number of members
 */
- (void)meetingMembersNumberUpdated:(NSInteger)membersNumber
{
}
/**
You are kicked
 */
- (void)meetingUserKicked
{
}
/**
 Receive a message
 
 @param message message
 @param fromID  message sender
 */
- (void)meetingMessageReceived:(NSString *)message fromID:(NSString *)fromID
{
}
/**
  Receive a private message
 
 @param message message
 @param fromID  message sender
 */
- (void)meetingPrivateMessageReceived:(NSString *)message fromID:(NSString *)fromID
{
}

/**
 Set video parameters
 
 @param config parameters
 */
- (void)setVideoConfig:(XHVideoConfig *)config;
/**
 *create a meeting
 * @param meetingItem Specify the Live name and type
 * @param completion callback
 */
- (void)createMeeting:(XHMeetingItem *)meetingItem completion:(void(^)(NSString *meetingID ,NSError *error))completion;

/**
 *join the meeting
 *@param completion callback
 */
- (void)joinMeeting:(NSString *)meetingID completion:(void(^)(NSError *error))completion;

/**
 Leave the meeting
 *@param completion callback
 */
- (void)leaveMeeting:(NSString *)meetingID completion:(void(^)(NSError *error))completion;

/**
 Switch camera direction
 
 @return Camera orientation after switching
 */
- (XHCameraDirection)switchCamera;

/**
 Switch to the big video preview
 */
- (void)changeToBigPreview:(UIView *)view;

/**
 Switch to the small video preview
 */
- (void)changeToSmall:(UIView *)view;


/**
 send a message
 
 @param message message
 @param completion callback
 */
- (void)sendMessage:(NSString *)message completion:(void(^)(NSError *error))completion;

/**
 send a private message
 
 @param message message
 @param toID receiver ID
 @param completion callback
 */
- (void)sendMessage:(NSString *)message toID:(NSString *)toID completion:(void(^)(NSError *error))completion;

/**
 mute somebody in the meeting room
 @param member the member who is  mute
 @param seconds mute time
 @param meetingId meeting id
 @param completion callback
 */
- (void)muteMember:(NSString*)member
        muteSeconds:(NSInteger)seconds
       frommeeting:(NSString *)meetingId
         completion:(void(^)(NSError *error))completion;

/**
 unmute somebody in the chatroom

 @param members the member who is  unmute
 @param meetingId meeting id
 @param completion callback
 */
- (void)unMuteMembers:(NSString *)member
         frommeeting:(NSString *)meetingId
           completion:(void(^)(NSError *error))completion;

/**
	kick a member
 @param member the member who is kicked
 @param meetingId meeting id
 @param completion callback
 */
- (void)kickMember:(NSString *)member
         frommeeting:(NSString *)meetingId
           completion:(void(^)(NSError *error))completion;