<?php
/**
 * Decides which post types have comments switched off.
 *
 * @package Adminkeep
 */

namespace Adminkeep\Service;

defined( 'ABSPATH' ) || exit;

/**
 * Pure policy object. Holds no hooks and touches no database.
 */
class CommentGuard {

	/**
	 * Whether every post type is covered.
	 *
	 * @var bool
	 */
	private $all_post_types;

	/**
	 * Post types covered when $all_post_types is false.
	 *
	 * @var string[]
	 */
	private $post_types;

	/**
	 * Constructor.
	 *
	 * @param bool  $all_post_types Cover every post type.
	 * @param array $post_types     Specific post types to cover.
	 */
	public function __construct( $all_post_types, array $post_types = array() ) {
		$this->all_post_types = (bool) $all_post_types;
		$this->post_types     = array_values( array_filter( array_map( 'strval', $post_types ) ) );
	}

	/**
	 * Whether comments are disabled for a post type.
	 *
	 * @param string $post_type Post type slug.
	 * @return bool
	 */
	public function is_disabled_for( $post_type ) {
		if ( '' === (string) $post_type ) {
			return false;
		}

		if ( $this->all_post_types ) {
			return true;
		}

		return in_array( $post_type, $this->post_types, true );
	}

	/**
	 * Whether comments are disabled for the post type of a given post.
	 *
	 * @param int|\WP_Post|null $post Post id or object.
	 * @return bool
	 */
	public function is_disabled_for_post( $post ) {
		$post_type = get_post_type( $post );

		if ( ! $post_type ) {
			return false;
		}

		return $this->is_disabled_for( $post_type );
	}

	/**
	 * Whether every post type is covered.
	 *
	 * @return bool
	 */
	public function covers_everything() {
		return $this->all_post_types;
	}

	/**
	 * The post types this guard covers, resolved against what is registered.
	 *
	 * @return string[]
	 */
	public function covered_post_types() {
		if ( $this->all_post_types ) {
			return get_post_types( array(), 'names' );
		}

		return $this->post_types;
	}
}