<?php

/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */
namespace DeliciousBrains\WPMDB\Container\Doctrine\Common\Cache;

/**
 * Base file cache driver.
 *
 * @since  2.3
 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
abstract class FileCache extends CacheProvider
{
    /**
     * The cache directory.
     *
     * @var string
     */
    protected $directory;
    /**
     * The cache file extension.
     *
     * @var string
     */
    private $extension;
    /**
     * @var string[] regular expressions for replacing disallowed characters in file name
     */
    private $disallowedCharacterPatterns = array(
        '/\\-/',
        // replaced to disambiguate original `-` and `-` derived from replacements
        '/[^a-zA-Z0-9\\-_\\[\\]]/',
    );
    /**
     * @var string[] replacements for disallowed file characters
     */
    private $replacementCharacters = array('__', '-');
    /**
     * Constructor.
     *
     * @param string $directory The cache directory.
     * @param string $extension The cache file extension.
     *
     * @throws \InvalidArgumentException
     */
    public function __construct($directory, $extension = '')
    {
        if (!\is_dir($directory) && !@\mkdir($directory, 0777, \true)) {
            throw new \InvalidArgumentException(\sprintf('The directory "%s" does not exist and could not be created.', $directory));
        }
        if (!\is_writable($directory)) {
            throw new \InvalidArgumentException(\sprintf('The directory "%s" is not writable.', $directory));
        }
        $this->directory = \realpath($directory);
        $this->extension = (string) $extension;
    }
    /**
     * Gets the cache directory.
     *
     * @return string
     */
    public function getDirectory()
    {
        return $this->directory;
    }
    /**
     * Gets the cache file extension.
     *
     * @return string|null
     */
    public function getExtension()
    {
        return $this->extension;
    }
    /**
     * @param string $id
     *
     * @return string
     */
    protected function getFilename($id)
    {
        return $this->directory . \DIRECTORY_SEPARATOR . \implode(\str_split(\hash('sha256', $id), 2), \DIRECTORY_SEPARATOR) . \DIRECTORY_SEPARATOR . \preg_replace($this->disallowedCharacterPatterns, $this->replacementCharacters, $id) . $this->extension;
    }
    /**
     * {@inheritdoc}
     */
    protected function doDelete($id)
    {
        return @\unlink($this->getFilename($id));
    }
    /**
     * {@inheritdoc}
     */
    protected function doFlush()
    {
        foreach ($this->getIterator() as $name => $file) {
            @\unlink($name);
        }
        return \true;
    }
    /**
     * {@inheritdoc}
     */
    protected function doGetStats()
    {
        $usage = 0;
        foreach ($this->getIterator() as $file) {
            $usage += $file->getSize();
        }
        $free = \disk_free_space($this->directory);
        return array(Cache::STATS_HITS => null, Cache::STATS_MISSES => null, Cache::STATS_UPTIME => null, Cache::STATS_MEMORY_USAGE => $usage, Cache::STATS_MEMORY_AVAILABLE => $free);
    }
    /**
     * Create path if needed.
     *
     * @param string $path
     * @return bool TRUE on success or if path already exists, FALSE if path cannot be created.
     */
    private function createPathIfNeeded($path)
    {
        if (!\is_dir($path)) {
            if (\false === @\mkdir($path, 0777, \true) && !\is_dir($path)) {
                return \false;
            }
        }
        return \true;
    }
    /**
     * Writes a string content to file in an atomic way.
     *
     * @param string $filename Path to the file where to write the data.
     * @param string $content  The content to write
     *
     * @return bool TRUE on success, FALSE if path cannot be created, if path is not writable or an any other error.
     */
    protected function writeFile($filename, $content)
    {
        $filepath = \pathinfo($filename, \PATHINFO_DIRNAME);
        if (!$this->createPathIfNeeded($filepath)) {
            return \false;
        }
        if (!\is_writable($filepath)) {
            return \false;
        }
        $tmpFile = \tempnam($filepath, 'swap');
        if (\file_put_contents($tmpFile, $content) !== \false) {
            if (@\rename($tmpFile, $filename)) {
                @\chmod($filename, 0666 & ~\umask());
                return \true;
            }
            @\unlink($tmpFile);
        }
        return \false;
    }
    /**
     * @return \Iterator
     */
    private function getIterator()
    {
        return new \RegexIterator(new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->directory)), '/^.+' . \preg_quote($this->extension, '/') . '$/i');
    }
}
