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<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     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 Composer\Downloader;

use Composer\Package\PackageInterface;
use Composer\Util\ProcessExecutor;

/**
 * @author BohwaZ <http://bohwaz.net/>
 */
class FossilDownloader extends VcsDownloader
{
    /**
     * {@inheritDoc}
     */
    public function doDownload(PackageInterface $package, $path, $url)
    {
        // Ensure we are allowed to use this URL by config
        $this->config->prohibitUrlByConfig($url, $this->io);

        $url = ProcessExecutor::escape($url);
        $ref = ProcessExecutor::escape($package->getSourceReference());
        $repoFile = $path . '.fossil';
        $this->io->writeError("Cloning ".$package->getSourceReference());
        $command = sprintf('fossil clone %s %s', $url, ProcessExecutor::escape($repoFile));
        if (0 !== $this->process->execute($command, $ignoredOutput)) {
            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
        }
        $command = sprintf('fossil open %s --nested', ProcessExecutor::escape($repoFile));
        if (0 !== $this->process->execute($command, $ignoredOutput, realpath($path))) {
            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
        }
        $command = sprintf('fossil update %s', $ref);
        if (0 !== $this->process->execute($command, $ignoredOutput, realpath($path))) {
            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
        }
    }

    /**
     * {@inheritDoc}
     */
    public function doUpdate(PackageInterface $initial, PackageInterface $target, $path, $url)
    {
        // Ensure we are allowed to use this URL by config
        $this->config->prohibitUrlByConfig($url, $this->io);

        $url = ProcessExecutor::escape($url);
        $ref = ProcessExecutor::escape($target->getSourceReference());
        $this->io->writeError(" Updating to ".$target->getSourceReference());

        if (!$this->hasMetadataRepository($path)) {
            throw new \RuntimeException('The .fslckout file is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
        }

        $command = sprintf('fossil pull && fossil up %s', $ref);
        if (0 !== $this->process->execute($command, $ignoredOutput, realpath($path))) {
            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
        }
    }

    /**
     * {@inheritDoc}
     */
    public function getLocalChanges(PackageInterface $package, $path)
    {
        if (!$this->hasMetadataRepository($path)) {
            return null;
        }

        $this->process->execute('fossil changes', $output, realpath($path));

        return trim($output) ?: null;
    }

    /**
     * {@inheritDoc}
     */
    protected function getCommitLogs($fromReference, $toReference, $path)
    {
        $command = sprintf('fossil timeline -t ci -W 0 -n 0 before %s', ProcessExecutor::escape($toReference));

        if (0 !== $this->process->execute($command, $output, realpath($path))) {
            throw new \RuntimeException('Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput());
        }

        $log = '';
        $match = '/\d\d:\d\d:\d\d\s+\[' . $toReference . '\]/';

        foreach ($this->process->splitLines($output) as $line) {
            if (preg_match($match, $line)) {
                break;
            }
            $log .= $line;
        }

        return $log;
    }

    /**
     * {@inheritDoc}
     */
    protected function hasMetadataRepository($path)
    {
        return is_file($path . '/.fslckout') || is_file($path . '/_FOSSIL_');
    }
}