<?php
/**
 * Cache situation: which caches serve REST responses before the rules can run.
 *
 * @package ThreeDoor
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Detects REST caches and empties them after a rule change.
 */
class ThreeDoor_Cache {

	/**
	 * Detected caches.
	 *
	 * @return array rest_cached (bool), caches: id => name, rest (bool).
	 */
	public static function state() {
		$caches = array();

		if ( defined( 'LSCWP_V' ) || class_exists( '\LiteSpeed\Core' ) ) {
			// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- hook of LiteSpeed Cache.
			$rest              = (bool) apply_filters( 'litespeed_conf', 'cache-rest' );
			$caches['litespeed'] = array( 'name' => 'LiteSpeed Cache', 'rest' => $rest );
		}
		if ( class_exists( '\WP_Rest_Cache_Plugin\Includes\Caching\Caching' ) ) {
			$caches['wp-rest-cache'] = array( 'name' => 'WP REST Cache', 'rest' => true );
		}
		if ( class_exists( '\W3TC\Dispatcher' ) ) {
			$rest = false;
			try {
				$rest = 'cache' === \W3TC\Dispatcher::config()->get_string( 'pgcache.rest' );
			} catch ( Exception $e ) {
				$rest = false;
			}
			$caches['w3-total-cache'] = array( 'name' => 'W3 Total Cache', 'rest' => $rest );
		}

		$rest_cached = false;
		foreach ( $caches as $cache ) {
			$rest_cached = $rest_cached || $cache['rest'];
		}
		return array(
			'rest_cached' => $rest_cached,
			'caches'      => $caches,
		);
	}

	/**
	 * Empty every cache that may still hold REST responses from before a rule change.
	 *
	 * @return void
	 */
	public static function purge() {
		$state = self::state();
		if ( ! empty( $state['caches']['litespeed']['rest'] ) ) {
			// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- hook of LiteSpeed Cache.
			do_action( 'litespeed_purge_all', '3task Doorman rules changed' );
		}
		if ( ! empty( $state['caches']['wp-rest-cache'] ) ) {
			\WP_Rest_Cache_Plugin\Includes\Caching\Caching::get_instance()->clear_caches( true );
		}
		if ( ! empty( $state['caches']['w3-total-cache']['rest'] ) && function_exists( 'w3tc_flush_all' ) ) {
			w3tc_flush_all();
		}
	}
}