<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Cache\Traits;

use Symfony\Component\Cache\CacheItem;
use Symfony\Component\Cache\Exception\InvalidArgumentException;

/**
 * @author Titouan Galopin <galopintitouan@gmail.com>
 * @author Nicolas Grekas <p@tchwork.com>
 *
 * @internal
 */
trait PhpArrayTrait
{
    private $file;
    private $values;
    private $fallbackPool;
    private $zendDetectUnicode;

    /**
     * Store an array of cached values.
     *
     * @param array $values The cached values
     */
    public function warmUp(array $values)
    {
        if (file_exists($this->file)) {
            if (!is_file($this->file)) {
                throw new InvalidArgumentException(sprintf('Cache path exists and is not a file: %s.', $this->file));
            }

            if (!is_writable($this->file)) {
                throw new InvalidArgumentException(sprintf('Cache file is not writable: %s.', $this->file));
            }
        } else {
            $directory = dirname($this->file);

            if (!is_dir($directory) && !@mkdir($directory, 0777, true)) {
                throw new InvalidArgumentException(sprintf('Cache directory does not exist and cannot be created: %s.', $directory));
            }

            if (!is_writable($directory)) {
                throw new InvalidArgumentException(sprintf('Cache directory is not writable: %s.', $directory));
            }
        }

        $dump = <<<'EOF'
<?php

// This file has been auto-generated by the Symfony Cache Component.

return array(


EOF;

        foreach ($values as $key => $value) {
            CacheItem::validateKey(is_int($key) ? (string) $key : $key);

            if (null === $value || is_object($value)) {
                try {
                    $value = serialize($value);
                } catch (\Exception $e) {
                    throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, get_class($value)), 0, $e);
                }
            } elseif (is_array($value)) {
                try {
                    $serialized = serialize($value);
                    $unserialized = unserialize($serialized);
                } catch (\Exception $e) {
                    throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable array value.', $key), 0, $e);
                }
                // Store arrays serialized if they contain any objects or references
                if ($unserialized !== $value || (false !== strpos($serialized, ';R:') && preg_match('/;R:[1-9]/', $serialized))) {
                    $value = $serialized;
                }
            } elseif (is_string($value)) {
                // Serialize strings if they could be confused with serialized objects or arrays
                if ('N;' === $value || (isset($value[2]) && ':' === $value[1])) {
                    $value = serialize($value);
                }
            } elseif (!is_scalar($value)) {
                throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, gettype($value)));
            }

            $dump .= var_export($key, true).' => '.var_export($value, true).",\n";
        }

        $dump .= "\n);\n";
        $dump = str_replace("' . \"\\0\" . '", "\0", $dump);

        $tmpFile = uniqid($this->file, true);

        file_put_contents($tmpFile, $dump);
        @chmod($tmpFile, 0666 & ~umask());
        unset($serialized, $unserialized, $value, $dump);

        @rename($tmpFile, $this->file);

        $this->initialize();
    }

    /**
     * {@inheritdoc}
     */
    public function clear()
    {
        $this->values = array();

        $cleared = @unlink($this->file) || !file_exists($this->file);

        return $this->fallbackPool->clear() && $cleared;
    }

    /**
     * Load the cache file.
     */
    private function initialize()
    {
        if ($this->zendDetectUnicode) {
            $zmb = ini_set('zend.detect_unicode', 0);
        }
        try {
            $this->values = file_exists($this->file) ? (include $this->file ?: array()) : array();
        } finally {
            if ($this->zendDetectUnicode) {
                ini_set('zend.detect_unicode', $zmb);
            }
        }
    }
}
