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<?php

/**
 * @file
 * Definition of Drush\Cache\FileCache.
 */

namespace Drush\Cache;

use Drush\Drush;
use Symfony\Component\Filesystem\Filesystem;
use Symfony\Component\Finder\Finder;
use Webmozart\PathUtil\Path;

/**
 * Default cache implementation.
 *
 * This cache implementation uses plain text files
 * containing serialized php to store cached data. Each cache bin corresponds
 * to a directory by the same name.
 *
 * @deprecated
 */
class FileCache implements CacheInterface
{
    const EXTENSION = '.cache';
    protected $bin;

    public function __construct($bin)
    {
        $this->bin = $bin;
        $this->directory = $this->cacheDirectory();
    }

    /**
     * Returns the cache directory for the given bin.
     *
     * @param string $bin
     */
    public function cacheDirectory($bin = null)
    {
        $bin = $bin ? $bin : $this->bin;
        return Path::join(Drush::config()->cache(), $bin);
    }

    public function get($cid)
    {
        $cids = [$cid];
        $cache = $this->getMultiple($cids);
        return reset($cache);
    }

    public function getMultiple(&$cids)
    {
        try {
            $cache = [];
            foreach ($cids as $cid) {
                $filename = $this->getFilePath($cid);
                if (!file_exists($filename)) {
                    return [];
                }

                $item = $this->readFile($filename);
                if ($item) {
                    $cache[$cid] = $item;
                }
            }
            $cids = array_diff($cids, array_keys($cache));
            return $cache;
        } catch (\Exception $e) {
            return [];
        }
    }

    /**
     * Returns the contents of the given filename unserialized.
     *
     * @param string $filename
     *   Absolute path to filename to read contents from.
     */
    public function readFile($filename)
    {
        $item = file_get_contents($filename);
        return $item ? unserialize($item) : false;
    }

    public function set($cid, $data, $expire = DRUSH_CACHE_PERMANENT)
    {
        $created = time();

        $cache = new \stdClass;
        $cache->cid = $cid;
        $cache->data = is_object($data) ? clone $data : $data;
        $cache->created = $created;
        if ($expire == DRUSH_CACHE_TEMPORARY) {
            $cache->expire = $created + 2591999;
        } elseif ($expire != DRUSH_CACHE_PERMANENT && $expire < 2592000) {
        // Expire time is in seconds if less than 30 days, otherwise is a timestamp.
            $cache->expire = $created + $expire;
        } else {
            $cache->expire = $expire;
        }

        // Ensure the cache directory still exists, in case a backend process
        // cleared the cache after the cache was initialized.
        $fs = new Filesystem();
        $fs->mkdir($this->directory);

        $filename = $this->getFilePath($cid);
        return $this->writeFile($filename, $cache);
    }

    /**
     * Serializes data and write it to the given filename.
     *
     * @param string $filename
     *   Absolute path to filename to write cache data.
     * @param $cache
     *   Cache data to serialize and write to $filename.
     */
    public function writeFile($filename, $cache)
    {
        return file_put_contents($filename, serialize($cache));
    }

    public function clear($cid = null, $wildcard = false)
    {
        $fs = new Filesystem();
        $bin_dir = $this->cacheDirectory();
        $files = [];
        if (empty($cid)) {
            $fs->remove($bin_dir);
        } else {
            if ($wildcard) {
                if ($cid == '*') {
                    $fs->remove($bin_dir);
                } else {
                    $files = Finder::create()
                      ->files()
                      ->name($cid)
                      ->in($bin_dir);
                }
            } else {
                $files[] = $this->getFilePath($cid);
            }

            $fs->remove($files);
        }
    }

    public function isEmpty()
    {
        $files = Finder::create()
          ->files()
          ->name()
          ->exclude()
          ->depth(0)
          ->in($this->directory);
        return empty($files);
    }

    /**
     * Converts a cache id to a full path.
     *
     * @param $cid
     *   The cache ID of the data to retrieve.
     *
     * @return
     *   The full path to the cache file.
     */
    protected function getFilePath($cid)
    {
        return $this->directory . '/' . str_replace([':', '\\', '/'], '.', $cid) . self::EXTENSION;
    }
}