<?php
/**
 * Rewrite rule upkeep.
 *
 * @package ElevenRank
 * @since   1.0.0
 */

namespace ElevenRank;

defined( 'ABSPATH' ) || exit;

/**
 * Makes WordPress rebuild its rewrite rules at the moments ElevenRank's own rules appear or go.
 *
 * Rules are registered on every request but only ever written to the database when they have to
 * be: when the plugin is activated, and (here) when it is deactivated or when a setting that
 * decides whether a module registers rules changes. The stored rules are deleted instead of
 * flushed, because during those requests ElevenRank's rules are still registered and a flush would
 * simply write them back.
 *
 * @since 1.0.0
 */
final class Rewrite_Rules {

	/**
	 * Settings store.
	 *
	 * @since 1.0.0
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Constructor.
	 *
	 * @since 1.0.0
	 *
	 * @param Settings $settings Settings store.
	 */
	public function __construct( Settings $settings ) {
		$this->settings = $settings;
	}

	/**
	 * Registers the hooks.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	public function hooks(): void {
		add_action( 'elevenrank_deactivate', array( self::class, 'forget' ) );

		// Which modules are on, and whether output continues next to another SEO plugin, decide
		// which rules get registered.
		// The first save of a group that was never stored is an "add", not an "update".
		foreach ( array( 'modules', 'general' ) as $group ) {
			add_action( 'update_option_' . $this->settings->option_name( $group ), array( self::class, 'forget' ) );
			add_action( 'add_option_' . $this->settings->option_name( $group ), array( self::class, 'forget' ) );
		}
	}

	/**
	 * Makes WordPress rebuild its rewrite rules on the next request.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	public static function forget(): void {
		delete_option( 'rewrite_rules' );
	}
}