<?php

/*
 * This file is part of Zippy.
 *
 * (c) Alchemy <info@alchemy.fr>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Alchemy\Zippy\Parser;

use Alchemy\Zippy\Exception\RuntimeException;

/**
 * This class is responsible of parsing GNUTar command line output
 */
class GNUTarOutputParser implements ParserInterface
{
    const PERMISSIONS   = '([ldrwx-]+)';
    const OWNER         = '([a-z][-a-z0-9]*)';
    const GROUP         = '([a-z][-a-z0-9]*)';
    const FILESIZE      = '(\d*)';
    const ISO_DATE      = '([0-9]+-[0-9]+-[0-9]+\s+[0-9]+:[0-9]+)';
    const FILENAME      = '(.*)';

    /**
     * @inheritdoc
     */
    public function parseFileListing($output)
    {
        $lines = array_values(array_filter(explode("\n", $output)));
        $members = array();

        foreach ($lines as $line) {
            $matches = array();

            // -rw-r--r-- gray/staff    62373 2006-06-09 12:06 apple
            if (!preg_match_all("#".
                self::PERMISSIONS       . "\s+" . // match (-rw-r--r--)
                self::OWNER             . "/"   . // match (gray)
                self::GROUP             . "\s+" . // match (staff)
                self::FILESIZE          . "\s+" . // match (62373)
                self::ISO_DATE          . "\s+" . // match (2006-06-09 12:06)
                self::FILENAME          .         // match (apple)
                "#",
                $line, $matches, PREG_SET_ORDER
            )) {
                continue;
            }

            $chunks = array_shift($matches);

            if (7 !== count($chunks)) {
                continue;
            }

            $date = \DateTime::createFromFormat("Y-m-d H:i", $chunks[5]);

            if (false === $date) {
                throw new RuntimeException(sprintf('Failed to parse mtime date from %s', $line));
            }

            $members[] = array(
                'location'  => $chunks[6],
                'size'      => $chunks[4],
                'mtime'     => $date,
                'is_dir'    => 'd' === $chunks[1][0]
            );
        }

        return $members;
    }

    /**
     * @inheritdoc
     */
    public function parseInflatorVersion($output)
    {
        $chunks = explode(' ', $output, 3);

        if (2 > count($chunks)) {
            return null;
        }

        list(, $version) = $chunks;

        return $version;
    }

    /**
     * @inheritdoc
     */
    public function parseDeflatorVersion($output)
    {
        return $this->parseInflatorVersion($output);
    }
}