protected function generate_item_details( $r ) {
		global $wpdb;

		$bp = buddypress();

		switch ( $r['type'] ) {
			case 'activity_update':
				if ( empty( $r['user-id'] ) ) {
					$r['user-id'] = $this->get_random_user_id();
				}

				// Make group updates look more like actual group updates.
				// i.e. give them links to their groups.
				if ( 'groups' === $r['component'] ) {

					if ( empty( $r['item-id'] ) ) {
						WP_CLI::error( 'No group found by that ID.' );
					}

					// get the group.
					$group_obj = groups_get_group( array(
						'group_id' => $r['item-id'],
					) );

					// make sure such a group exists.
					if ( empty( $group_obj->id ) ) {
						WP_CLI::error( 'No group found by that slug or id.' );
					}

					// stolen from groups_join_group.
					$r['action'] = sprintf( '%1$s posted an update in the group %2$s', bp_core_get_userlink( $r['user-id'] ), '<a href="' . bp_get_group_permalink( $group_obj ) . '">' . esc_attr( $group_obj->name ) . '</a>' );
				} else {
					// old way, for some other kind of update.
					$r['action'] = sprintf( '%s posted an update', bp_core_get_userlink( $r['user-id'] ) );
				}
				if ( empty( $r['content'] ) ) {
					$r['content'] = $this->generate_random_text();
				}

				$r['primary-link'] = bp_core_get_userlink( $r['user-id'] );

				break;

			case 'activity_comment':
				if ( empty( $r['user-id'] ) ) {
					$r['user-id'] = $this->get_random_user_id();
				}

				$parent_item = $wpdb->get_row( "SELECT * FROM {$bp->activity->table_name} ORDER BY RAND() LIMIT 1" ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared

				if ( \is_object( $parent_item ) ) {
					if ( 'activity_comment' === $parent_item->type ) {
						$r['item-id']           = $parent_item->id;
						$r['secondary-item-id'] = $parent_item->secondary_item_id;
					} else {
						$r['item-id'] = $parent_item->id;
					}
				}

				$r['action']       = sprintf( '%s posted a new activity comment', bp_core_get_userlink( $r['user-id'] ) );
				$r['content']      = $this->generate_random_text();
				$r['primary-link'] = bp_core_get_userlink( $r['user-id'] );

				break;

			case 'new_blog':
			case 'new_blog_post':
			case 'new_blog_comment':
				if ( ! bp_is_active( 'blogs' ) ) {
					return $r;
				}

				if ( is_multisite() ) {
					$r['item-id'] = $wpdb->get_var( "SELECT blog_id FROM {$wpdb->blogs} ORDER BY RAND() LIMIT 1" ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
				} else {
					$r['item-id'] = 1;
				}

				// Need blog content for posts/comments.
				if ( 'new_blog_post' === $r['type'] || 'new_blog_comment' === $r['type'] ) {

					if ( is_multisite() ) {
						switch_to_blog( $r['item-id'] );
					}

					$comment_info = $wpdb->get_results( "SELECT comment_id, comment_post_id FROM {$wpdb->comments} ORDER BY RAND() LIMIT 1" ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
					$comment_id   = $comment_info[0]->comment_id;
					$comment      = get_comment( $comment_id );

					$post_id = $comment_info[0]->comment_post_id;
					$post    = get_post( $post_id );

					if ( is_multisite() ) {
						restore_current_blog();
					}
				}

				// new_blog.
				if ( 'new_blog' === $r['type'] ) {
					if ( '' === $r['user-id'] ) {
						$r['user-id'] = $this->get_random_user_id();
					}

					if ( ! $r['action'] ) {
						$r['action'] = sprintf( '%s created the site %s', bp_core_get_userlink( $r['user-id'] ), '<a href="' . get_home_url( $r['item-id'] ) . '">' . esc_attr( get_blog_option( $r['item-id'], 'blogname' ) ) . '</a>' );
					}

					if ( ! $r['primary-link'] ) {
						$r['primary-link'] = get_home_url( $r['item-id'] );
					}

				// new_blog_post.
				} elseif ( 'new_blog_post' === $r['type'] ) {
					if ( '' === $r['user-id'] ) {
						$r['user-id'] = $post->post_author;
					}

					if ( '' === $r['primary-link'] ) {
						$r['primary-link'] = add_query_arg( 'p', $post->ID, trailingslashit( get_home_url( $r['item-id'] ) ) );
					}

					if ( '' === $r['action'] ) {
						$r['action'] = sprintf( '%1$s wrote a new post, %2$s', bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $r['primary-link'] . '">' . $post->post_title . '</a>' );
					}

					if ( '' === $r['content'] ) {
						$r['content'] = $post->post_content;
					}

					if ( '' === $r['secondary-item-id'] ) {
						$r['secondary-item-id'] = $post->ID;
					}

				// new_blog_comment.
				} else {
					// groan - have to fake this.
					if ( '' === $r['user-id'] ) {
						$user         = get_user_by( 'email', $comment->comment_author_email );
						$r['user-id'] = ( empty( $user ) )
							? $this->get_random_user_id()
							: $user->ID;
					}

					$post_permalink = get_permalink( $comment->comment_post_ID );
					$comment_link   = get_comment_link( $comment->comment_ID );

					if ( '' === $r['primary-link'] ) {
						$r['primary-link'] = $comment_link;
					}

					if ( '' === $r['action'] ) {
						$r['action'] = sprintf( '%1$s commented on the post, %2$s', bp_core_get_userlink( $r['user-id'] ), '<a href="' . $post_permalink . '">' . apply_filters( 'the_title', $post->post_title ) . '</a>' );
					}

					if ( '' === $r['content'] ) {
						$r['content'] = $comment->comment_content;
					}

					if ( '' === $r['secondary-item-id'] ) {
						$r['secondary-item-id'] = $comment->ID;
					}
				}

				$r['content'] = '';

				break;

			case 'friendship_created':
				if ( empty( $r['user-id'] ) ) {
					$r['user-id'] = $this->get_random_user_id();
				}

				if ( empty( $r['item-id'] ) ) {
					$r['item-id'] = $this->get_random_user_id();
				}

				$r['action'] = sprintf( '%1$s and %2$s are now friends', bp_core_get_userlink( $r['user-id'] ), bp_core_get_userlink( $r['item-id'] ) );

				break;

			case 'created_group':
				if ( empty( $r['item-id'] ) ) {
					$random_group = \BP_Groups_Group::get_random( 1, 1 );
					$r['item-id'] = $random_group['groups'][0]->slug;
				}

				$group = groups_get_group( array(
					'group_id' => $r['item-id'],
				) );

				// @todo what if it's not a group? ugh
				if ( empty( $r['user-id'] ) ) {
					$r['user-id'] = $group->creator_id;
				}

				$group_permalink = bp_get_group_permalink( $group );

				if ( empty( $r['action'] ) ) {
					$r['action'] = sprintf( '%1$s created the group %2$s', bp_core_get_userlink( $r['user-id'] ), '<a href="' . $group_permalink . '">' . esc_attr( $group->name ) . '</a>' );
				}

				if ( empty( $r['primary-link'] ) ) {
					$r['primary-link'] = $group_permalink;
				}

				break;

			case 'joined_group':
				if ( empty( $r['item-id'] ) ) {
					$random_group = \BP_Groups_Group::get_random( 1, 1 );
					if ( ! empty( $random_group['groups'][0]->slug ) ) {
						$r['item-id'] = $random_group['groups'][0]->slug;
					}
				}

				$group = groups_get_group( array(
					'group_id' => $r['item-id'],
				) );

				if ( empty( $r['user-id'] ) ) {
					$r['user-id'] = $this->get_random_user_id();
				}

				if ( empty( $r['action'] ) ) {
					$r['action'] = sprintf( '%1$s joined the group %2$s', bp_core_get_userlink( $r['user-id'] ), '<a href="' . bp_get_group_permalink( $group ) . '">' . esc_attr( $group->name ) . '</a>' );
				}

				if ( empty( $r['primary-link'] ) ) {
					$r['primary-link'] = bp_get_group_permalink( $group );
				}

				break;

			case 'new_avatar':
			case 'new_member':
			case 'updated_profile':
				if ( empty( $r['user-id'] ) ) {
					$r['user-id'] = $this->get_random_user_id();
				}

				$userlink = bp_core_get_userlink( $r['user-id'] );

					// new_avatar.
				if ( 'new_avatar' === $r['type'] ) {
					$r['action'] = sprintf( '%s changed their profile picture', $userlink );

					// new_member.
				} elseif ( 'new_member' === $r['type'] ) {
					$r['action'] = sprintf( '%s became a registered member', $userlink );

					// updated_profile.
				} else {
					$r['action'] = sprintf( '%s updated their profile', $userlink );
				}

				break;
		}

		return $r;
	}