<?php
/**
 * Dynamic discovery of public post types and taxonomies.
 *
 * @package OrbitstemSEO
 */

namespace Orbitstem\SEO\Content;

use Orbitstem\SEO\Core\Settings;

defined( 'ABSPATH' ) || exit;

/**
 * Lists the content types Orbitstem SEO manages, keyed by machine name so
 * newly registered types are picked up without code changes.
 */
class TypeRegistry {

	/**
	 * Settings service.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Constructor.
	 *
	 * @param Settings $settings Settings service.
	 */
	public function __construct( Settings $settings ) {
		$this->settings = $settings;
	}

	/**
	 * Public, front-end viewable post types (attachments excluded).
	 *
	 * @return array<string,\WP_Post_Type>
	 */
	public function post_types() {
		$types = array();
		foreach ( get_post_types( array( 'public' => true ), 'objects' ) as $name => $object ) {
			if ( 'attachment' === $name || ! is_post_type_viewable( $object ) ) {
				continue;
			}
			$types[ $name ] = $object;
		}

		/**
		 * Filters the post types Orbitstem SEO manages.
		 *
		 * @param array<string,\WP_Post_Type> $types Post type objects keyed by name.
		 */
		return apply_filters( 'orbitstem_seo_post_types', $types );
	}

	/**
	 * Public, front-end viewable taxonomies (post formats excluded).
	 *
	 * @return array<string,\WP_Taxonomy>
	 */
	public function taxonomies() {
		$taxes = array();
		foreach ( get_taxonomies( array( 'public' => true ), 'objects' ) as $name => $object ) {
			if ( 'post_format' === $name || ! is_taxonomy_viewable( $object ) ) {
				continue;
			}
			$taxes[ $name ] = $object;
		}

		/**
		 * Filters the taxonomies Orbitstem SEO manages.
		 *
		 * @param array<string,\WP_Taxonomy> $taxes Taxonomy objects keyed by name.
		 */
		return apply_filters( 'orbitstem_seo_taxonomies', $taxes );
	}

	/**
	 * Whether a post type is managed.
	 *
	 * @param string $post_type Post type name.
	 * @return bool
	 */
	public function supports_post_type( $post_type ) {
		return array_key_exists( $post_type, $this->post_types() );
	}

	/**
	 * Whether a taxonomy is managed.
	 *
	 * @param string $taxonomy Taxonomy name.
	 * @return bool
	 */
	public function supports_taxonomy( $taxonomy ) {
		return array_key_exists( $taxonomy, $this->taxonomies() );
	}

	/**
	 * Post types present on the site that have no saved settings yet.
	 *
	 * @return string[]
	 */
	public function unconfigured_post_types() {
		$saved = (array) $this->settings->get( 'post_types' );
		return array_values( array_diff( array_keys( $this->post_types() ), array_keys( $saved ) ) );
	}

	/**
	 * Taxonomies present on the site that have no saved settings yet.
	 *
	 * @return string[]
	 */
	public function unconfigured_taxonomies() {
		$saved = (array) $this->settings->get( 'taxonomies' );
		return array_values( array_diff( array_keys( $this->taxonomies() ), array_keys( $saved ) ) );
	}
}