case 'attachment':
					if ( ! $this->isInvalidAttachment( $post ) ) {
						$remainingPosts[] = $post;
					}
					break;
				default:
					$remainingPosts[] = $post;
					break;
			}
		}

		return $remainingPosts;
	}

	/**
	 * Excludes attachments if their post parent isn't published or parent post type isn't registered anymore.
	 *
	 * @since 4.0.0
	 *
	 * @param  Object  $post The post.
	 * @return boolean       Whether the attachment is invalid.
	 */
	private function isInvalidAttachment( $post ) {
		if ( empty( $post->post_parent ) ) {
			return false;
		}

		$parent = get_post( $post->post_parent );
		if ( ! is_object( $parent ) ) {
			return false;
		}

		if (
			'publish' !== $parent->post_status ||
			! in_array( $parent->post_type, get_post_types(), true ) ||
			$parent->post_password
		) {
			return true;
		}

		return false;
	}

	/**
	 * Returns all eligble sitemap entries for a given taxonomy.
	 *
	 * @since 4.0.0
	 *
	 * @param  string $taxonomy       The taxonomy.
	 * @param  array  $additionalArgs Any additional arguments for the term query.
	 * @return array|int              The term objects or the term count.
	 */
	public function terms( $taxonomy, $additionalArgs = [] ) {
		// Set defaults.
		$fields  = 't.term_id';
		$offset  = aioseo()->sitemap->offset;

		// Override defaults if passed as additional arg.
		foreach ( $additionalArgs as $name => $value ) {
			$$name = esc_sql( $value );
			if ( 'root' === $name && $value ) {
				$fields = 't.term_id';
			}
			if ( 'count' === $name && $value ) {
				$fields = 'count(t.term_id) as total';
			}
		}

		$termRelationshipsTable = aioseo()->core->db->db->prefix . 'term_relationships';
		$termTaxonomyTable      = aioseo()->core->db->db->prefix . 'term_taxonomy';
		$query = aioseo()->core->db
			->start( aioseo()->core->db->db->terms . ' as t', true )
			->select( $fields )
			->whereRaw( "
			( `t`.`term_id` IN
				(
					SELECT `tt`.`term_id`
					FROM `$termTaxonomyTable` as tt
					WHERE `tt`.`taxonomy` = '$taxonomy'
					AND `tt`.`count` > 0
				)
			)" );

		$excludedTerms = aioseo()->sitemap->helpers->excludedTerms();
		if ( $excludedTerms ) {
			$query->whereRaw("
				( `t`.`term_id` NOT IN
					(
						SELECT `tr`.`term_taxonomy_id`
						FROM `$termRelationshipsTable` as tr
						WHERE `tr`.`term_taxonomy_id` IN ( $excludedTerms )
					)
				)" );
		}

		if (
			aioseo()->sitemap->indexes &&
			empty( $additionalArgs['root'] ) &&
			( empty( $additionalArgs['count'] ) || ! $additionalArgs['count'] )
		) {
			$query->limit( aioseo()->sitemap->linksPerIndex, $offset );
		}

		// Return the total if we are just counting the terms.
		if ( ! empty( $additionalArgs['count'] ) && $additionalArgs['count'] ) {
			return (int) $query->run( true, 'var' )
				->result();
		}

		$terms = $query->orderBy( '`t`.`term_id` ASC' )
			->run()
			->result();

		foreach ( $terms as $term ) {
			// Convert ID from string to int.
			$term->term_id = (int) $term->term_id;
			// Add taxonomy name to object manually instead of querying it to prevent redundant join.
			$term->taxonomy = $taxonomy;
		}

		return $terms;
	}

	/**
	 * Wipes all data and forces the plugin to rescan the site for images.
	 *
	 * @since 4.0.13
	 *
	 * @return void
	 */
	public function resetImages() {
		aioseo()->core->db
			->update( 'aioseo_posts' )
			->set(
				[
					'images'          => null,
					'image_scan_date' => null
				]
			)
			->run();
	}
}