<?php
/**
 * Object Caching check.
 *
 * @package advanced-analytics
 *
 * @since 4.9.0
 */

declare(strict_types=1);

namespace ADVAN\Checks\Speed;

use ADVAN\Checks\Abstract_Check;
use ADVAN\Helpers\Plugin_Theme_Helper;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'ADVAN\Checks\Speed\Object_Caching_Check' ) ) {

	/**
	 * Checks if persistent object caching is enabled.
	 *
	 * @since 4.9.0
	 */
	class Object_Caching_Check extends Abstract_Check {

		/**
		 * Check identifier.
		 *
		 * @var string Check identifier.
		 * @since 4.9.0
		 */
		protected static string $id = 'object-caching';

		/**
		 * Check category.
		 *
		 * @var string Check category.
		 * @since 4.9.0
		 */
		protected static string $category = 'speed';

		/**
		 * Check weight (1-10).
		 *
		 * @var int Check weight.
		 * @since 4.9.0
		 */
		protected static int $weight = 7;

		/**
		 * Check title (translatable).
		 *
		 * @return string Check title.
		 *
		 * @since 4.9.0
		 */
		public static function get_title(): string {
			return \__( 'Object Caching', '0-day-analytics' );
		}

		/**
		 * Check description (translatable).
		 *
		 * @return string Check description.
		 *
		 * @since 4.9.0
		 */
		public static function get_description(): string {
			return \__( 'Checks if persistent object caching is enabled.', '0-day-analytics' );
		}

		/**
		 * Run the check.
		 *
		 * @return array Check result.
		 *
		 * @since 4.9.0
		 */
		public static function run(): array {
			global $wp_object_cache;

			$has_object_cache = file_exists( WP_CONTENT_DIR . '/object-cache.php' );
			$using_external   = false;
			$cache_type       = 'none';

			if ( $has_object_cache ) {
				// Try to determine the type.
				if ( defined( 'WP_REDIS_HOST' ) || class_exists( 'WP_Object_Cache' ) && method_exists( $wp_object_cache, 'redis_status' ) ) {
					$cache_type     = 'Redis';
					$using_external = true;
				} elseif ( defined( 'MEMCACHED_SERVERS' ) || class_exists( 'Memcached' ) ) {
					$cache_type     = 'Memcached';
					$using_external = true;
				} elseif ( class_exists( 'APCu_Object_Cache' ) || function_exists( 'apcu_store' ) ) {
					$cache_type     = 'APCu';
					$using_external = true;
				}
			}

			// Check for caching plugins that handle object caching.
			$object_cache_plugins = array(
				'redis-cache/redis-cache.php'           => 'Redis Object Cache',
				'object-cache-pro/object-cache-pro.php' => 'Object Cache Pro',
				'docket-cache/docket-cache.php'         => 'Docket Cache',
			);

			$active_plugin = null;
			foreach ( $object_cache_plugins as $plugin_path => $plugin_name ) {
				if ( Plugin_Theme_Helper::is_plugin_active( $plugin_path ) ) {
					$active_plugin  = $plugin_name;
					$using_external = true;
					break;
				}
			}

			$details = array(
				'has_object_cache' => $has_object_cache,
				'cache_type'       => $cache_type,
				'active_plugin'    => $active_plugin,
			);

			if ( $using_external ) {
				$cache_name = $active_plugin ?: $cache_type;
				return static::pass(
					sprintf(
					/* translators: %s: cache type/plugin name */
						\__( 'Persistent object caching is enabled using %s. Database queries are being cached, reducing load and speeding up your site.', '0-day-analytics' ),
						$cache_name
					),
					$details
				);
			}

			if ( $has_object_cache ) {
				return static::warning(
					\__( 'An object cache drop-in is present, but we couldn\'t determine if it\'s using a persistent cache backend like Redis or Memcached.', '0-day-analytics' ),
					\__( 'Verify your object caching is properly configured. Check with your hosting provider if Redis or Memcached is available.', '0-day-analytics' ),
					$details
				);
			}

			return static::fail(
				'medium',
				\__( 'Your site is using WordPress\'s built-in object cache, which only lasts for the duration of a single page request. Persistent object caching (like Redis) can significantly speed up database-heavy sites.', '0-day-analytics' ),
				\__( 'Enable persistent object caching with Redis or Memcached. Check if your hosting provider offers this feature, or install a plugin like Redis Object Cache.', '0-day-analytics' ),
				$details
			);
		}
	}
}