<?php


namespace Doctrine\Common\Cache;

/**
 * Filesystem cache driver.
 *
 * @since  2.3
 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
class FilesystemCache extends FileCache
{
    const EXTENSION = '.doctrinecache.data';

    /**
     * {@inheritdoc}
     */
    protected $extension = self::EXTENSION;

    /**
     * {@inheritdoc}
     */
    protected function doFetch($id)
    {
        $data     = '';
        $lifetime = -1;
        $filename = $this->getFilename($id);

        if ( ! is_file($filename)) {
            return false;
        }

        $resource = fopen($filename, "r");

        if (false !== ($line = fgets($resource))) {
            $lifetime = (integer) $line;
        }

        if ($lifetime !== 0 && $lifetime < time()) {
            fclose($resource);

            return false;
        }

        while (false !== ($line = fgets($resource))) {
            $data .= $line;
        }

        fclose($resource);

        return unserialize($data);
    }

    /**
     * {@inheritdoc}
     */
    protected function doContains($id)
    {
        $lifetime = -1;
        $filename = $this->getFilename($id);

        if ( ! is_file($filename)) {
            return false;
        }

        $resource = fopen($filename, "r");

        if (false !== ($line = fgets($resource))) {
            $lifetime = (integer) $line;
        }

        fclose($resource);

        return $lifetime === 0 || $lifetime > time();
    }

    /**
     * {@inheritdoc}
     */
    protected function doSave($id, $data, $lifeTime = 0)
    {
        if ($lifeTime > 0) {
            $lifeTime = time() + $lifeTime;
        }

        $data       = serialize($data);
        $filename   = $this->getFilename($id);
        $filepath   = pathinfo($filename, PATHINFO_DIRNAME);

        if ( ! is_dir($filepath)) {
            if (false === @mkdir($filepath, 0777, true) && !is_dir($filepath)) {
                return false;
            }
        } elseif ( ! is_writable($filepath)) {
            return false;
        }

        $tmpFile = tempnam($filepath, basename($filename));

        if ((file_put_contents($tmpFile, $lifeTime . PHP_EOL . $data) !== false) && @rename($tmpFile, $filename)) {
            @chmod($filename, 0666 & ~umask());

            return true;
        }

        return false;
    }
}
