public function addTopicParticipants( $topicID, $invitedUsers, $readingMemberID )

	{

		//-----------------------------------------

		// INIT

		//-----------------------------------------



		$topicData           = $this->fetchTopicData( $topicID );

		$memberData          = IPSMember::load( intval( $readingMemberID ), 'extendedProfile,groups' );

		$currentParticipants = $this->fetchTopicParticipants( $topicID );



		//-----------------------------------------

		// Can access this topic?

		//-----------------------------------------



		if ( $this->canAccessTopic( $memberData['member_id'], $topicData, $currentParticipants ) !== TRUE )

		{

			throw new Exception( 'NO_PERMISSION' );

		}



		//-----------------------------------------

		// Build invited users

		//-----------------------------------------



		$invitedUsersData = $this->checkAndReturnInvitedUsers( $invitedUsers, $memberData, count($currentParticipants) );



		if ( isset($invitedUsersData[ $topicData['mt_starter_id'] ]) )

		{

			if ( $memberData['member_id'] == $topicData['mt_starter_id'] )

			{

				throw new Exception( 'CANT_INVITE_SELF' );

			}

		}



		if ( isset($invitedUsersData[ $topicData['mt_to_member_id'] ]) OR isset($invitedUsersData[ $topicData['mt_starter_id'] ]) )

		{

			throw new Exception( 'CANT_INVITE_RECIPIENT_EXIST' );

		}



		//-----------------------------------------

		// Knock out ones that are already participated

		// At this point $currentParticipants contains non-active

		// participants. This is OK as we don't want the ability

		// to keep re-inviting those who choose to leave.

		//-----------------------------------------



		$existInBoth = array_intersect( array_keys( $currentParticipants ), array_keys( $invitedUsersData ) );



		if ( count( $existInBoth ) )

		{

			foreach( $existInBoth as $id )

			{

				unset( $invitedUsersData[ $id ] );

			}

		}



		//-----------------------------------------

		// Anything left?

		//-----------------------------------------



		if ( ! count( $invitedUsersData ) )

		{

			throw new Exception( 'NO_ONE_TO_INVITE' );

		}



		//-----------------------------------------

		// Update the topic

		// Now we can strip non-active participants

		//-----------------------------------------



		$__topicParticipants = array_merge( array_keys( $this->_stripNonActiveParticipants( $currentParticipants ) ), array_keys( $invitedUsersData ) );



		/* Fix up so they're unique and indexed by member ID */

		if ( is_array( $__topicParticipants ) AND count ( $__topicParticipants ) )

		{

			foreach( $__topicParticipants as $_mid )

			{

				$_topicParticipants[ $_mid ] = $_mid;

			}

		}



		/* Remove topic starter */

		unset( $_topicParticipants[ $topicData['mt_starter_id'] ] );



		/* Remove recipient */

		unset( $_topicParticipants[ $topicData['mt_to_member_id'] ] );



		$this->DB->update( 'message_topics', array( 'mt_invited_members' => serialize( $_topicParticipants ),

												    'mt_to_count'        => count( $_topicParticipants ) + 1 ), 'mt_id=' . $topicID );



		//-----------------------------------------

		// Add the users to the invite tree

		//-----------------------------------------



		foreach( $invitedUsersData as $id => $toMember )

		{

			$this->DB->insert( 'message_topic_user_map', array( 'map_user_id'          => $id,

																'map_topic_id'         => $topicID,

																'map_folder_id'        => 'myconvo',

																'map_user_active'      => 1,

																'map_has_unread'       => 1,

																'map_user_banned'	   => 0,

																'map_read_time'        => 0,

																'map_left_time'		   => 0,

																'map_ignore_notification' => 0,

																'map_last_topic_reply' => $topicData['mt_last_post_time'] ) );





			$new_vdir = $this->rebuildFolderCount( $toMember['member_id'], array( 'myconvo' => 'plus:1', 'new' => 'plus:1' ), TRUE, array( 'core' => array( 'msg_count_total'       => 'plus:1',

																															 						   		'msg_count_new'         => 'plus:1' ) ) );



			//-----------------------------------------

			// Notifications library

			//-----------------------------------------



			$classToLoad		= IPSLib::loadLibrary( IPS_ROOT_PATH . '/sources/classes/member/notifications.php', 'notifications' );

			$notifyLibrary		= new $classToLoad( $this->registry );



			$toMember['language'] = $toMember['language'] == "" ? IPSLib::getDefaultLanguage() : $toMember['language'];



			IPSText::getTextClass('email')->getTemplate( "personal_convo_invite", $toMember['language'] );



			IPSText::getTextClass('email')->buildMessage( array(

																'NAME'		=> $toMember['members_display_name'],

																'POSTER'	=> $memberData['members_display_name'],

																'TITLE'		=> $topicData['mt_title'],

																'LINK'		=> "?app=members&module=messaging&section=view&do=showConversation&topicID={$topicID}" ) );



			IPSText::getTextClass('email')->subject	= sprintf(

																IPSText::getTextClass('email')->subject,

																$this->registry->output->buildSEOUrl( 'showuser=' . $memberData['member_id'], 'public', $memberData['members_seo_name'], 'showuser' ),

																$memberData['members_display_name'],

																$this->registry->output->buildUrl( "app=members&module=messaging&section=view&do=showConversation&topicID={$topicID}", 'public' )

															);



			$notifyLibrary->setMember( $toMember );

			$notifyLibrary->setFrom( $memberData );

			$notifyLibrary->setNotificationKey( 'invite_private_message' );

			$notifyLibrary->setNotificationUrl( $this->registry->output->buildUrl( "app=members&module=messaging&section=view&do=showConversation&topicID={$topicID}", 'public' ) );

			$notifyLibrary->setNotificationText( IPSText::getTextClass('email')->message );

			$notifyLibrary->setNotificationTitle( IPSText::getTextClass('email')->subject );



			try

			{

				$notifyLibrary->sendNotification();

			}

			catch( Exception $e ){}

		}



		return TRUE;

	}

	/**

	 * Delete personal topics

	 *

	 * @param	int				Owner Member dID

	 * @param	array 			Array of IDs to delete

	 * @param	string			[ Raw SQL to query on when selecting messages to delete, optional ]

	 * @param	bool			Force hard delete

	 * @return	mixed			bool or exception

	 *

	 * <code>

	 * Exception Codes:

	 * NO_SUCH_MEMBER:			The member ID does not exist

	 * NO_IDS_TO_DELETE:		No IDs to delete (empty id array)

	 * </code>

	 */

	public function deleteTopics( $memberID, $ids, $rawSQL=NULL, $hardDelete=false )

	{

		//-----------------------------------------

		// Grab data