<?php
defined( 'ABSPATH' ) or die( );
if ( ! class_exists( 'rsssl_cache' ) ) {
	class rsssl_cache {
		private static $_this;

		public function __construct() {
			if ( isset( self::$_this ) ) {
				wp_die( 'you cannot create a second instance.' );
			}

			self::$_this = $this;
		}

		public static function this() {
			return self::$_this;
		}

		/**
		 * Flushes the cache for popular caching plugins to prevent mixed content errors
		 * When .htaccess is changed, all traffic should flow over https, so clear cache when possible.
		 * Supported: W3TC, WP Optimize, LiteSpeed, Hummingbird, WP Fastest Cache,
		 * Autoptimize, WP Rocket, Cache Enabler, WP Super Cache, Cloudflare
		 *
		 * @since  2.0
		 *
		 * @access public
		 *
		 */

		public function flush() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			add_action( 'admin_head', array( $this, 'maybe_flush_w3tc_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_wp_optimize_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_litespeed_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_hummingbird_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_fastest_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_autoptimize_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_wp_rocket' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_cache_enabler' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_wp_super_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_cloudflare_cache' ) );
		}

		public function maybe_flush_w3tc_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( function_exists( 'w3tc_flush_all' ) ) {
				w3tc_flush_all();
			}
		}

		public function maybe_flush_wp_optimize_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( function_exists( 'wpo_cache_flush' ) ) {
				wpo_cache_flush();
			}
		}

		public function maybe_flush_litespeed_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( class_exists( 'LiteSpeed' ) ) {
				Litespeed\Purge::purge_all();
			}
		}

		public function maybe_flush_hummingbird_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( is_callable( array( 'Hummingbird\WP_Hummingbird', 'flush_cache' ) ) ) {
				Hummingbird\WP_Hummingbird::flush_cache();
			}
		}

		public function maybe_flush_fastest_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( class_exists( 'WpFastestCache' ) ) {
				// Non-static cannot be called statically ::
				( new WpFastestCache() )->deleteCache();
			}
		}

		public function maybe_flush_autoptimize_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( class_exists( 'autoptimizeCache' ) ) {
				autoptimizeCache::clearall();
			}
		}

		public function maybe_flush_wp_rocket() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( function_exists( 'rocket_clean_domain' ) ) {
				rocket_clean_domain();
			}
		}

		public function maybe_flush_cache_enabler() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( class_exists( 'Cache_Enabler' ) ) {
				Cache_Enabler::clear_complete_cache();
			}
		}

		public function maybe_flush_wp_super_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( function_exists( 'wp_cache_clear_cache' ) ) {
				wp_cache_clear_cache();
			}
		}

		/**
		 * Flush Cloudflare cache if the Cloudflare plugin is active.
		 *
		 * @see https://github.com/cloudflare/Cloudflare-WordPress
		 */
		public function maybe_flush_cloudflare_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

			if ( defined( 'CLOUDFLARE_PLUGIN_DIR' ) && class_exists( '\Cloudflare\APO\WordPress\Hooks' ) ) {
				try {
					$cloudflare_hooks = new \Cloudflare\APO\WordPress\Hooks();
					$cloudflare_hooks->purgeCacheEverything();
				} catch ( \Throwable $e ) {
					// Silently fail if Cloudflare API is not configured.
				}
			}
		}
	}//class closure
}