function bp_nouveau_ajax_readunread_thread_messages() {
	if ( empty( $_POST['action'] ) ) {
		wp_send_json_error();
	}

	$action = str_replace( 'messages_', '', $_POST['action'] );

	$response = array(
		'feedback' => __( 'There was a problem marking your messages as read. Please try again.', 'buddypress' ),
		'type'     => 'error',
	);

	if ( 'unread' === $action ) {
		$response = array(
			'feedback' => __( 'There was a problem marking your messages as unread. Please try again.', 'buddypress' ),
			'type'     => 'error',
		);
	}

	if ( empty( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], 'bp_nouveau_messages' ) ) {
		wp_send_json_error( $response );
	}

	if ( empty( $_POST['id'] ) ) {
		wp_send_json_error( $response );
	}

	$thread_ids = wp_parse_id_list( $_POST['id'] );

	$response['messages'] = array();

	if ( 'unread' === $action ) {
		$response['feedback'] = __( 'Messages marked as unread.', 'buddypress' );
	} else {
		$response['feedback'] = __( 'Messages marked as read.', 'buddypress' );
	}

	foreach ( $thread_ids as $thread_id ) {
		if ( ! messages_check_thread_access( $thread_id ) && ! bp_current_user_can( 'bp_moderate' ) ) {
			wp_send_json_error( $response );
		}

		if ( 'unread' === $action ) {
			// Mark unread
			messages_mark_thread_unread( $thread_id );
		} else {
			// Mark read
			messages_mark_thread_read( $thread_id );
		}

		$response['messages'][ $thread_id ] = array(
			'unread' => 'unread' === $action,
		);
	}

	$response['type'] = 'success';

	wp_send_json_success( $response );
}