<?php

declare (strict_types=1);
/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *     Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */
namespace PhpCsFixer\Cache;

use PhpCsFixer\Hasher;
/**
 * Class supports caching information about state of fixing files.
 *
 * Cache is supported only for phar version and version installed via composer.
 *
 * File will be processed by PHP CS Fixer only if any of the following conditions is fulfilled:
 *  - cache is corrupt
 *  - fixer version changed
 *  - rules changed
 *  - file is new
 *  - file changed
 *
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * @internal
 *
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise.
 */
final class FileCacheManager implements \PhpCsFixer\Cache\CacheManagerInterface
{
    public const WRITE_FREQUENCY = 10;
    /**
     * @var \PhpCsFixer\Cache\FileHandlerInterface
     */
    private $handler;
    /**
     * @var \PhpCsFixer\Cache\SignatureInterface
     */
    private $signature;
    /**
     * @var bool
     */
    private $isDryRun;
    /**
     * @var \PhpCsFixer\Cache\DirectoryInterface
     */
    private $cacheDirectory;
    /**
     * @var int
     */
    private $writeCounter = 0;
    /**
     * @var bool
     */
    private $signatureWasUpdated = \false;
    /**
     * @var \PhpCsFixer\Cache\CacheInterface
     */
    private $cache;
    public function __construct(\PhpCsFixer\Cache\FileHandlerInterface $handler, \PhpCsFixer\Cache\SignatureInterface $signature, bool $isDryRun = \false, ?\PhpCsFixer\Cache\DirectoryInterface $cacheDirectory = null)
    {
        $this->handler = $handler;
        $this->signature = $signature;
        $this->isDryRun = $isDryRun;
        $this->cacheDirectory = $cacheDirectory ?? new \PhpCsFixer\Cache\Directory('');
        $this->readCache();
    }
    public function __destruct()
    {
        if (\true === $this->signatureWasUpdated || 0 !== $this->writeCounter) {
            $this->writeCache();
        }
    }
    /**
     * This class is not intended to be serialized,
     * and cannot be deserialized (see __wakeup method).
     */
    public function __sleep() : array
    {
        throw new \BadMethodCallException('Cannot serialize ' . __CLASS__);
    }
    /**
     * Disable the deserialization of the class to prevent attacker executing
     * code by leveraging the __destruct method.
     *
     * @see https://owasp.org/www-community/vulnerabilities/PHP_Object_Injection
     */
    public function __wakeup() : void
    {
        throw new \BadMethodCallException('Cannot unserialize ' . __CLASS__);
    }
    public function needFixing(string $file, string $fileContent) : bool
    {
        $file = $this->cacheDirectory->getRelativePathTo($file);
        return !$this->cache->has($file) || $this->cache->get($file) !== $this->calcHash($fileContent);
    }
    public function setFile(string $file, string $fileContent) : void
    {
        $this->setFileHash($file, $this->calcHash($fileContent));
    }
    public function setFileHash(string $file, string $hash) : void
    {
        $file = $this->cacheDirectory->getRelativePathTo($file);
        if ($this->isDryRun && $this->cache->has($file) && $this->cache->get($file) !== $hash) {
            $this->cache->clear($file);
        } else {
            $this->cache->set($file, $hash);
        }
        if (self::WRITE_FREQUENCY === ++$this->writeCounter) {
            $this->writeCounter = 0;
            $this->writeCache();
        }
    }
    private function readCache() : void
    {
        $cache = $this->handler->read();
        if (null === $cache || !$this->signature->equals($cache->getSignature())) {
            $cache = new \PhpCsFixer\Cache\Cache($this->signature);
            $this->signatureWasUpdated = \true;
        }
        $this->cache = $cache;
    }
    private function writeCache() : void
    {
        $this->handler->write($this->cache);
    }
    private function calcHash(string $content) : string
    {
        return Hasher::calculate($content);
    }
}
