<?php

namespace AdPresso\Infrastructure;

use AdPresso\RuntimeDebugger;

defined( 'ABSPATH' ) || exit;

/**
 * Cache Manager class that handles flushing of known caches, when Adpresso settings are updated.
 */
class CacheManager {

	/**
	 * Attaches the cache delete function at the updating process of the AdPresso settings.
	 *
	 * @return void
	 */
	public static function hooks(): void {
		// We need a hook for every settings option name.
		$adpresso_options = [
			// 'adpresso_settings_general', // The main option group for global rules.
			// 'adpresso_module_status',    // When the toggle of a module status needs a flush.
			// 'adpresso_pro_lazy_load_settings', // Settings for the lazy loading module, etc.
		];

		foreach ( $adpresso_options as $option_name ) {
			add_action( "update_option_{$option_name}", [ self::class, 'clear_all_known_caches' ], 10, 0 );
		}
	}

	/**
	 * Tries to flush all known page caches and the WordPress object cache.
	 * Should only be called, when settings are saved that could have influence on the frontend displaying.
	 */
	public static function clear_all_known_caches(): void {
		if ( ! is_admin() || ! current_user_can( 'manage_options' ) ) {
			// return; // Possibly not needed since the hook itself needs a special capability.
		}

		// WordPress Object Cache (use with care.)
		// wp_cache_flush(); // Flushs the whole object cache. Probably not needed for simple setting changes.

		// WP Rocket
		if ( function_exists( 'rocket_clean_domain' ) ) {
			rocket_clean_domain();
		}
		if ( function_exists( 'rocket_clean_minify' ) ) { // CSS/JS
			rocket_clean_minify();
		}
		if ( function_exists( 'rocket_clean_cache_busting' ) ) { // Cache Busting Files
			rocket_clean_cache_busting();
		}

		// LiteSpeed Cache
		if ( class_exists( '\LiteSpeed\Purge' ) ) {
			\LiteSpeed\Purge::purge_all();
		} elseif ( function_exists( 'litespeed_purge_all' ) ) { // Older versions or alternative calls.
			litespeed_purge_all();
		}

		// WP Super Cache
		if ( function_exists( 'wp_cache_clear_cache' ) ) {
			wp_cache_clear_cache();
		}

		// SG Optimizer (SiteGround)
		if ( function_exists( 'sg_cachepress_purge_cache' ) ) {
			sg_cachepress_purge_cache();
		}

		// Kinsta Cache
		if ( class_exists( 'Kinsta\Cache' ) && isset( $GLOBALS['kinsta_cache'] ) ) {
			if ( method_exists( $GLOBALS['kinsta_cache'], 'kinsta_cache_purge' ) ) { // Method can vary.
				$GLOBALS['kinsta_cache']->kinsta_cache_purge(); // Or specific purge actions.
			}
		}

		// WP Engine
		if ( class_exists( 'WPECommon' ) ) {
			if ( method_exists( 'WPECommon', 'purge_memcached' ) ) {
				\WPECommon::purge_memcached();
			}
			if ( method_exists( 'WPECommon', 'clear_all_cache' ) ) { // Method can vary
				\WPECommon::clear_all_cache();
			}
			if ( method_exists( 'WPECommon', 'purge_varnish_cache' ) ) { // Method can vary.
				\WPECommon::purge_varnish_cache();
			}
		}

		// Hook for other plugins or developers to use.
		do_action( 'adpresso_clear_page_cache' );

		RuntimeDebugger::add_server_error_log_entry( 'AdPresso: Attempted to clear known page caches due to settings change.' );
	}
}