<?php

/*

 * This file is part of the Monolog package.

 *

 * (c) Jordi Boggiano <j.boggiano@seld.be>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Monolog\Handler;

use Monolog\Logger;

/**

 * Stores logs to files that are rotated every day and a limited number of files are kept.

 *

 * This rotation is only intended to be used as a workaround. Using logrotate to

 * handle the rotation is strongly encouraged when you can use it.

 *

 * @author Christophe Coevoet <stof@notk.org>

 */

class RotatingFileHandler extends StreamHandler

{

    protected $filename;

    protected $maxFiles;

    protected $mustRotate;

    /**

     * @param string $filename

     * @param integer $maxFiles The maximal amount of files to keep (0 means unlimited)

     * @param integer $level The minimum logging level at which this handler will be triggered

     * @param Boolean $bubble Whether the messages that are handled can bubble up the stack or not

     */

    public function __construct($filename, $maxFiles = 0, $level = Logger::DEBUG, $bubble = true)

    {

        $this->filename = $filename;

        $this->maxFiles = (int) $maxFiles;

        $fileInfo = pathinfo($this->filename);

        $timedFilename = $fileInfo['dirname'].'/'.$fileInfo['filename'].'-'.date('Y-m-d');

        if (!empty($fileInfo['extension'])) {

            $timedFilename .= '.'.$fileInfo['extension'];

        }

        // disable rotation upfront if files are unlimited

        if (0 === $this->maxFiles) {

            $this->mustRotate = false;

        }

        parent::__construct($timedFilename, $level, $bubble);

    }

    /**

     * {@inheritdoc}

     */

    public function close()

    {

        parent::close();

        if (true === $this->mustRotate) {

            $this->rotate();

        }

    }

    /**

     * {@inheritdoc}

     */

    protected function write(array $record)

    {

        // on the first record written, if the log is new, we should rotate (once per day)

        if (null === $this->mustRotate) {

            $this->mustRotate = !file_exists($this->url);

        }

        parent::write($record);

    }

    /**

     * Rotates the files.

     */

    protected function rotate()

    {

        $fileInfo = pathinfo($this->filename);

        $glob = $fileInfo['dirname'].'/'.$fileInfo['filename'].'-*';

        if (!empty($fileInfo['extension'])) {

            $glob .= '.'.$fileInfo['extension'];

        }

        $iterator = new \GlobIterator($glob);

        $count = $iterator->count();

        if ($this->maxFiles >= $count) {

            // no files to remove

            return;

        }

        // Sorting the files by name to remove the older ones

        $array = iterator_to_array($iterator);

        usort($array, function($a, $b) {

            return strcmp($b->getFilename(), $a->getFilename());

        });

        foreach (array_slice($array, $this->maxFiles) as $file) {

            if ($file->isWritable()) {

                unlink($file->getRealPath());

            }

        }

    }

}