<?php

declare(strict_types=1);

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Cache;

use CodeIgniter\Cache\Exceptions\CacheException;
use CodeIgniter\Exceptions\CriticalError;
use CodeIgniter\Test\Mock\MockCache;
use Config\Cache;

/**
 * A factory for loading the desired
 *
 * @see \CodeIgniter\Cache\CacheFactoryTest
 */
class CacheFactory
{
 /**
 * The class to use when mocking
 *
 * @var string
 */
 public static $mockClass = MockCache::class;

 /**
 * The service to inject the mock as
 *
 * @var string
 */
 public static $mockServiceName = 'cache';

 /**
 * Attempts to create the desired cache handler, based upon the
 *
 * @param non-empty-string|null $handler
 * @param non-empty-string|null $backup
 *
 * @return CacheInterface
 */
 public static function getHandler(Cache $config, ?string $handler = null, ?string $backup = null)
 {
 if ($config->validHandlers === []) {
 throw CacheException::forInvalidHandlers();
 }

 $handler ??= $config->handler;
 $backup ??= $config->backupHandler;

 if (! array_key_exists($handler, $config->validHandlers) || ! array_key_exists($backup, $config->validHandlers)) {
 throw CacheException::forHandlerNotFound();
 }

 $adapter = new $config->validHandlers[$handler]($config);

 if (! $adapter->isSupported()) {
 $adapter = new $config->validHandlers[$backup]($config);

 if (! $adapter->isSupported()) {
 // Fall back to the dummy adapter.
 $adapter = new $config->validHandlers['dummy']();
 }
 }

 // If $adapter->initialize() throws a CriticalError exception, we will attempt to
 // use the $backup handler, if that also fails, we resort to the dummy handler.
 try {
 $adapter->initialize();
 } catch (CriticalError $e) {
 log_message('critical', $e . ' Resorting to using ' . $backup . ' handler.');

 // get the next best cache handler (or dummy if the $backup also fails)
 $adapter = self::getHandler($config, $backup, 'dummy');
 }

 return $adapter;
 }
}