function bbp_move_reply_handler( $action = '' ) {

	// Bail if action is not 'bbp-move-reply'
	if ( 'bbp-move-reply' !== $action ) {
		return;
	}

	// Prevent debug notices
	$move_reply_id = $destination_topic_id = 0;
	$destination_topic_title = '';
	$destination_topic = $move_reply = $source_topic = '';

	/** Move Reply ***********************************************************/

	if ( empty( $_POST['bbp_reply_id'] ) ) {
		bbp_add_error( 'bbp_move_reply_reply_id', __( '<strong>ERROR</strong>: A reply ID is required', 'bbpress' ) );
	} else {
		$move_reply_id = (int) $_POST['bbp_reply_id'];
	}

	$move_reply = bbp_get_reply( $move_reply_id );

	// Reply exists
	if ( empty( $move_reply ) ) {
		bbp_add_error( 'bbp_mover_reply_r_not_found', __( '<strong>ERROR</strong>: The reply you want to move was not found.', 'bbpress' ) );
	}

	/** Topic to Move From ***************************************************/

	// Get the current topic a reply is in
	$source_topic = bbp_get_topic( $move_reply->post_parent );

	// No topic
	if ( empty( $source_topic ) ) {
		bbp_add_error( 'bbp_move_reply_source_not_found', __( '<strong>ERROR</strong>: The topic you want to move from was not found.', 'bbpress' ) );
	}

	// Nonce check failed
	if ( ! bbp_verify_nonce_request( 'bbp-move-reply_' . $move_reply->ID ) ) {
		bbp_add_error( 'bbp_move_reply_nonce', __( '<strong>ERROR</strong>: Are you sure you wanted to do that?', 'bbpress' ) );
		return;
	}

	// Use cannot edit topic
	if ( ! current_user_can( 'edit_topic', $source_topic->ID ) ) {
		bbp_add_error( 'bbp_move_reply_source_permission', __( '<strong>ERROR</strong>: You do not have permission to edit the source topic.', 'bbpress' ) );
	}

	// How to move
	if ( ! empty( $_POST['bbp_reply_move_option'] ) ) {
		$move_option = (string) trim( $_POST['bbp_reply_move_option'] );
	}

	// Invalid move option
	if ( empty( $move_option ) || ! in_array( $move_option, array( 'existing', 'topic' ), true ) ) {
		bbp_add_error( 'bbp_move_reply_option', __( '<strong>ERROR</strong>: You need to choose a valid move option.', 'bbpress' ) );

	// Valid move option
	} else {

		// What kind of move
		switch ( $move_option ) {

			// Into an existing topic
			case 'existing' :

				// Get destination topic id
				if ( empty( $_POST['bbp_destination_topic'] ) ) {
					bbp_add_error( 'bbp_move_reply_destination_id', __( '<strong>ERROR</strong>: A topic ID is required.', 'bbpress' ) );
				} else {
					$destination_topic_id = (int) $_POST['bbp_destination_topic'];
				}

				// Get the destination topic
				$destination_topic = bbp_get_topic( $destination_topic_id );

				// No destination topic
				if ( empty( $destination_topic ) ) {
					bbp_add_error( 'bbp_move_reply_destination_not_found', __( '<strong>ERROR</strong>: The topic you want to move to was not found.', 'bbpress' ) );
				}

				// User cannot edit the destination topic
				if ( ! current_user_can( 'edit_topic', $destination_topic->ID ) ) {
					bbp_add_error( 'bbp_move_reply_destination_permission', __( '<strong>ERROR</strong>: You do not have permission to edit the destination topic.', 'bbpress' ) );
				}

				// Bump the reply position
				$reply_position = bbp_get_topic_reply_count( $destination_topic->ID, true ) + 1;

				// Update the reply
				wp_update_post( array(
					'ID'          => $move_reply->ID,
					'post_title'  => '',
					'post_name'   => false, // will be automatically generated
					'post_parent' => $destination_topic->ID,
					'menu_order'  => $reply_position,
					'guid'        => ''
				) );

				// Adjust reply meta values
				bbp_update_reply_topic_id( $move_reply->ID, $destination_topic->ID );
				bbp_update_reply_forum_id( $move_reply->ID, bbp_get_topic_forum_id( $destination_topic->ID ) );

				break;

			// Move reply to a new topic
			case 'topic' :
			default :

				// User needs to be able to publish topics
				if ( current_user_can( 'publish_topics' ) ) {

					// Use the new title that was passed
					if ( ! empty( $_POST['bbp_reply_move_destination_title'] ) ) {
						$destination_topic_title = sanitize_text_field( $_POST['bbp_reply_move_destination_title'] );

					// Use the source topic title
					} else {
						$destination_topic_title = $source_topic->post_title;
					}

					// Update the topic
					$destination_topic_id = wp_update_post( array(
						'ID'          => $move_reply->ID,
						'post_title'  => $destination_topic_title,
						'post_name'   => false,
						'post_type'   => bbp_get_topic_post_type(),
						'post_parent' => $source_topic->post_parent,
						'guid'        => ''
					) );
					$destination_topic = bbp_get_topic( $destination_topic_id );

					// Make sure the new topic knows its a topic
					bbp_update_topic_topic_id( $move_reply->ID );

					// Shouldn't happen
					if ( false === $destination_topic_id || is_wp_error( $destination_topic_id ) || empty( $destination_topic ) ) {
						bbp_add_error( 'bbp_move_reply_destination_reply', __( '<strong>ERROR</strong>: There was a problem converting the reply into the topic. Please try again.', 'bbpress' ) );
					}

				// User cannot publish posts
				} else {
					bbp_add_error( 'bbp_move_reply_destination_permission', __( '<strong>ERROR</strong>: You do not have permission to create new topics. The reply could not be converted into a topic.', 'bbpress' ) );
				}

				break;
		}
	}

	// Bail if there are errors
	if ( bbp_has_errors() ) {
		return;
	}

	/** No Errors - Clean Up **************************************************/

	// Update counts, etc...
	do_action( 'bbp_pre_move_reply', $move_reply->ID, $source_topic->ID, $destination_topic->ID );

	/** Date Check ************************************************************/

	// Check if the destination topic is older than the move reply
	if ( strtotime( $move_reply->post_date ) < strtotime( $destination_topic->post_date ) ) {

		// Set destination topic post_date to 1 second before from reply
		$destination_post_date = date( 'Y-m-d H:i:s', strtotime( $move_reply->post_date ) - 1 );

		// Update destination topic
		wp_update_post( array(
			'ID'            => $destination_topic_id,
			'post_date'     => $destination_post_date,
			'post_date_gmt' => get_gmt_from_date( $destination_post_date )
		) );
	}

	// Set the last reply ID and freshness to the move_reply
	$last_reply_id = $move_reply->ID;
	$freshness     = $move_reply->post_date;

	// Get the reply to
	$parent = bbp_get_reply_to( $move_reply->ID );

	// Fix orphaned children
	$children = get_posts( array(
		'post_type'  => bbp_get_reply_post_type(),
		'meta_key'   => '_bbp_reply_to',
		'meta_type'  => 'NUMERIC',
		'meta_value' => $move_reply->ID,
	) );
	foreach ( $children as $child ) {
		bbp_update_reply_to( $child->ID, $parent );
	}

	// Remove reply_to from moved reply
	delete_post_meta( $move_reply->ID, '_bbp_reply_to' );

	// It is a new topic and we need to set some default metas to make
	// the topic display in bbp_has_topics() list
	if ( 'topic' === $move_option ) {
		bbp_update_topic_last_reply_id   ( $destination_topic->ID, $last_reply_id );
		bbp_update_topic_last_active_id  ( $destination_topic->ID, $last_reply_id );
		bbp_update_topic_last_active_time( $destination_topic->ID, $freshness     );

	// Otherwise update the existing destination topic
	} else {
		bbp_update_topic_last_reply_id   ( $destination_topic->ID );
		bbp_update_topic_last_active_id  ( $destination_topic->ID );
		bbp_update_topic_last_active_time( $destination_topic->ID );
	}

	// Update source topic ID last active
	bbp_update_topic_last_reply_id   ( $source_topic->ID );
	bbp_update_topic_last_active_id  ( $source_topic->ID );
	bbp_update_topic_last_active_time( $source_topic->ID );

	/** Successful Move ******************************************************/

	// Update counts, etc...
	do_action( 'bbp_post_move_reply', $move_reply->ID, $source_topic->ID, $destination_topic->ID );

	// Redirect back to the topic
	bbp_redirect( bbp_get_topic_permalink( $destination_topic->ID ) );
}