bp_blogs_sync_add_from_activity_comment( int $comment_id, array $params, object $parent_activity )

function bp_blogs_sync_add_from_activity_comment( $comment_id, $params, $parent_activity ) {
	// if parent activity isn't a post type having the buddypress-activity support, stop now!
	if ( ! bp_activity_type_supports( $parent_activity->type, 'post-type-comment-tracking' ) ) {
		return;
	}

	// If activity comments are disabled for blog posts, stop now!
	if ( bp_disable_blogforum_comments() ) {
		return;
	}

	// Do not sync if the activity comment was marked as spam.
	$activity = new BP_Activity_Activity( $comment_id );
	if ( $activity->is_spam ) {
		return;
	}

	// Get userdata.
	if ( $params['user_id'] == bp_loggedin_user_id() ) {
		$user = buddypress()->loggedin_user->userdata;
	} else {
		$user = bp_core_get_core_userdata( $params['user_id'] );
	}

	// Get associated post type and set default comment parent
	$post_type      = bp_activity_post_type_get_tracking_arg( $parent_activity->type, 'post_type' );
	$comment_parent = 0;

	// See if a parent WP comment ID exists.
	if ( ! empty( $params['parent_id'] ) && ! empty( $post_type ) ) {
		$comment_parent = bp_activity_get_meta( $params['parent_id'], "bp_blogs_{$post_type}_comment_id" );
	}

	// Comment args.
	$args = array(
		'comment_post_ID'      => $parent_activity->secondary_item_id,
		'comment_author'       => bp_core_get_user_displayname( $params['user_id'] ),
		'comment_author_email' => $user->user_email,
		'comment_author_url'   => bp_core_get_user_domain( $params['user_id'], $user->user_nicename, $user->user_login ),
		'comment_content'      => $params['content'],
		'comment_type'         => '', // Could be interesting to add 'buddypress' here...
		'comment_parent'       => (int) $comment_parent,
		'user_id'              => $params['user_id'],
		'comment_approved'     => 1
	);

	// Prevent separate activity entry being made.
	remove_action( 'comment_post', 'bp_activity_post_type_comment', 10 );

	// Handle multisite.
	switch_to_blog( $parent_activity->item_id );

	// Handle timestamps for the WP comment after we've switched to the blog.
	$args['comment_date']     = current_time( 'mysql' );
	$args['comment_date_gmt'] = current_time( 'mysql', 1 );

	// Post the comment.
	$post_comment_id = wp_insert_comment( $args );

	// Add meta to comment.
	add_comment_meta( $post_comment_id, 'bp_activity_comment_id', $comment_id );

	// Add meta to activity comment.
	if ( ! empty( $post_type ) ) {
		bp_activity_update_meta( $comment_id, "bp_blogs_{$post_type}_comment_id", $post_comment_id );
	}

	// Resave activity comment with WP comment permalink.
	//
	// in bp_blogs_activity_comment_permalink(), we change activity comment
	// permalinks to use the post comment link
	//
	// @todo since this is done after AJAX posting, the activity comment permalink
	// doesn't change on the front end until the next page refresh.
	$resave_activity = new BP_Activity_Activity( $comment_id );
	$resave_activity->primary_link = get_comment_link( $post_comment_id );

	/**
	 * Now that the activity id exists and the post comment was created, we don't need to update
	 * the content of the comment as there are no chances it has evolved.
	 */
	remove_action( 'bp_activity_before_save', 'bp_blogs_sync_activity_edit_to_post_comment', 20 );

	$resave_activity->save();

	// Add the edit activity comment hook back.
	add_action( 'bp_activity_before_save', 'bp_blogs_sync_activity_edit_to_post_comment', 20 );

	// Multisite again!
	restore_current_blog();

	// Add the comment hook back.
	add_action( 'comment_post', 'bp_activity_post_type_comment', 10, 2 );

	/**
	 * Fires after activity comments have been synced and posted as blog comments.
	 *
	 * @since BuddyPress 2.0.0
	 *
	 * @param int    $comment_id      The activity ID for the posted activity comment.
	 * @param array  $args            Array of args used for the comment syncing.
	 * @param object $parent_activity Parameters of the blog post parent activity item.
	 * @param object $user            User data object for the blog comment.
	 */
	do_action( 'bp_blogs_sync_add_from_activity_comment', $comment_id, $args, $parent_activity, $user );
}