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

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

	if ( 'star' === $action ) {
		$error_message = __( 'There was a problem starring your messages. Please try again.', 'buddypress' );
	} else {
		$error_message = __( 'There was a problem unstarring your messages. Please try again.', 'buddypress' );
	}

	$response = array(
		'feedback' => esc_html( $error_message ),
		'type'     => 'error',
	);

	if ( false === bp_is_active( 'messages', 'star' ) || empty( $_POST['id'] ) ) {
		wp_send_json_error( $response );
	}

	// Check capability.
	if ( ! is_user_logged_in() || ! bp_core_can_edit_settings() ) {
		wp_send_json_error( $response );
	}

	$ids      = wp_parse_id_list( $_POST['id'] );
	$messages = array();

	// Use global nonce for bulk actions involving more than one id
	if ( 1 !== count( $ids ) ) {
		if ( empty( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], 'bp_nouveau_messages' ) ) {
			wp_send_json_error( $response );
		}

		foreach ( $ids as $mid ) {
			if ( 'star' === $action ) {
				bp_messages_star_set_action( array(
					'action'     => 'star',
					'message_id' => $mid,
				) );
			} else {
				$thread_id = messages_get_message_thread_id( $mid );

				bp_messages_star_set_action( array(
					'action'    => 'unstar',
					'thread_id' => $thread_id,
					'bulk'      => true
				) );
			}

			$messages[ $mid ] = array(
				'star_link' => bp_get_the_message_star_action_link( array(
					'message_id' => $mid,
					'url_only'  => true,
				) ),
				'is_starred' => 'star' === $action,
			);
		}

	// Use global star nonce for bulk actions involving one id or regular action
	} else {
		$id = reset( $ids );

		if ( empty( $_POST['star_nonce'] ) || ! wp_verify_nonce( $_POST['star_nonce'], 'bp-messages-star-' . $id ) ) {
			wp_send_json_error( $response );
		}

		bp_messages_star_set_action( array(
			'action'     => $action,
			'message_id' => $id,
		) );

		$messages[ $id ] = array(
			'star_link' => bp_get_the_message_star_action_link( array(
				'message_id' => $id,
				'url_only'  => true,
			) ),
			'is_starred' => 'star' === $action,
		);
	}

	if ( 'star' === $action ) {
		$success_message = __( 'Messages successfully starred.', 'buddypress' );
	} else {
		$success_message = __( 'Messages successfully unstarred.', 'buddypress' );
	}

	wp_send_json_success( array(
		'feedback' => esc_html( $success_message ),
		'type'     => 'success',
		'messages' => $messages,
	) );
}