<?php



class WP_Sitemaps_Taxonomies extends WP_Sitemaps_Provider {
	
	public function __construct() {
		$this->name        = 'taxonomies';
		$this->object_type = 'term';
	}

	
	public function get_object_subtypes() {
		$taxonomies = get_taxonomies( array( 'public' => true ), 'objects' );

		$taxonomies = array_filter( $taxonomies, 'is_taxonomy_viewable' );

		
		return apply_filters( 'wp_sitemaps_taxonomies', $taxonomies );
	}

	
	public function get_url_list( $page_num, $object_subtype = '' ) {
		// Restores the more descriptive, specific name for use within this method.
		$taxonomy = $object_subtype;

		$supported_types = $this->get_object_subtypes();

		// Bail early if the queried taxonomy is not supported.
		if ( ! isset( $supported_types[ $taxonomy ] ) ) {
			return array();
		}

		
		$url_list = apply_filters(
			'wp_sitemaps_taxonomies_pre_url_list',
			null,
			$taxonomy,
			$page_num
		);

		if ( null !== $url_list ) {
			return $url_list;
		}

		$url_list = array();

		// Offset by how many terms should be included in previous pages.
		$offset = ( $page_num - 1 ) * wp_sitemaps_get_max_urls( $this->object_type );

		$args           = $this->get_taxonomies_query_args( $taxonomy );
		$args['fields'] = 'all';
		$args['offset'] = $offset;

		$taxonomy_terms = new WP_Term_Query( $args );

		if ( ! empty( $taxonomy_terms->terms ) ) {
			foreach ( $taxonomy_terms->terms as $term ) {
				$term_link = get_term_link( $term, $taxonomy );

				if ( is_wp_error( $term_link ) ) {
					continue;
				}

				$sitemap_entry = array(
					'loc' => $term_link,
				);

				
				$sitemap_entry = apply_filters( 'wp_sitemaps_taxonomies_entry', $sitemap_entry, $term->term_id, $taxonomy, $term );
				$url_list[]    = $sitemap_entry;
			}
		}

		return $url_list;
	}

	
	public function get_max_num_pages( $object_subtype = '' ) {
		if ( empty( $object_subtype ) ) {
			return 0;
		}

		// Restores the more descriptive, specific name for use within this method.
		$taxonomy = $object_subtype;

		
		$max_num_pages = apply_filters( 'wp_sitemaps_taxonomies_pre_max_num_pages', null, $taxonomy );

		if ( null !== $max_num_pages ) {
			return $max_num_pages;
		}

		$term_count = wp_count_terms( $this->get_taxonomies_query_args( $taxonomy ) );

		return (int) ceil( (int) $term_count / wp_sitemaps_get_max_urls( $this->object_type ) );
	}

	
	protected function get_taxonomies_query_args( $taxonomy ) {
		
		$args = apply_filters(
			'wp_sitemaps_taxonomies_query_args',
			array(
				'taxonomy'               => $taxonomy,
				'orderby'                => 'term_order',
				'number'                 => wp_sitemaps_get_max_urls( $this->object_type ),
				'hide_empty'             => true,
				'hierarchical'           => false,
				'update_term_meta_cache' => false,
			),
			$taxonomy
		);

		return $args;
	}
}