<?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\Package\Archiver;

use Composer\Package\PackageInterface;
use Composer\Util\ProcessExecutor;
use Composer\Downloader\GitDownloader;
use Composer\Downloader\HgDownloader;
use Composer\Downloader\SvnDownloader;
use Composer\IO\NullIO;
use Composer\Factory;

/**
 * @author Till Klampaeckel <till@php.net>
 */
abstract class BaseArchiver implements ArchiverInterface
{
    /**
     * Format: zip or tar.
     * @var string
     */
    protected $format = '';

    /**
     * Path to where to dump the export to.
     * @var mixed|null
     */
    protected $path;

    /**
     * @var ProcessExecutor
     */
    protected $process;

    /**
     * Working directory.
     * @var string
     */
    protected $temp;

    /**
     * @param mixed                $path
     * @param ProcessExecutor|null $process
     *
     * @throws \InvalidArgumentException
     */
    public function __construct($path = null, ProcessExecutor $process = null)
    {
        if (!empty($path)) {
            if (!is_writable($path)) {
                throw new \InvalidArgumentException("Not authorized to write to '{$path}'");
            }
            $this->path = $path;
        }
        $this->process = $process ?: new ProcessExecutor();
        $this->temp    = sys_get_temp_dir();
    }

    /**
     * @return \Composer\Downloader\DownloadManager
     */
    public function getDownloadManager()
    {
        $factory = new Factory;
        $dm = $factory->createDownloadManager(new NullIO());
        return $dm;
    }

    /**
     * @param PackageInterface $package
     * @param string           $extension
     *
     * @return string
     * @throws \InvalidArgumentException When unknown 'format' is encountered.
     */
    public function getFilename(PackageInterface $package, $extension)
    {
        $name = $package->getPrettyVersion();
        $fileName = sprintf('%s.%s', $name, $extension);
        return $fileName;
    }

    /**
     * @param PackageInterface $package
     *
     * @return string
     * @throws \RuntimeException
     */
    protected function getAndEnsureWorkDirectory(PackageInterface $package)
    {
        $workDir = sprintf('%s/%s/%s', $this->temp, $this->format, $package->getName());
        if (!file_exists($workDir)) {
            mkdir($workDir, 0777, true);
        }
        if (!file_exists($workDir)) {
            throw new \RuntimeException("Could not find '{$workDir}' directory.");
        }
        return $workDir;
    }

    /**
     * Package the given directory into an archive.
     *
     * The format is most likely \Phar::TAR or \Phar::ZIP.
     *
     * @param string $filename
     * @param string $workDir
     * @param int    $format
     *
     * @throws \RuntimeException
     */
    protected function package($filename, $workDir, $format)
    {
        try {
            $phar = new \PharData($filename, null, null, $format);
            $phar->buildFromDirectory($workDir);
        } catch (\UnexpectedValueException $e) {
            $message  = "Original PHAR exception: " . (string) $e;
            $message .= PHP_EOL . PHP_EOL;
            $message .= sprintf("Could not create archive '%s' from '%s'.", $filename, $workDir);
            throw new \RuntimeException($message);
        }
    }

    /**
     * @param string $fileName
     * @param string $sourceRef
     * @param string $workDir
     */
    protected function packageGit($fileName, $sourceRef, $workDir)
    {
        $command = sprintf(
            'git archive --format %s --output %s %s',
            $this->format,
            escapeshellarg(sprintf('%s/%s', $this->path, $fileName)),
            $sourceRef
        );
        $this->process->execute($command, $output, $workDir);
    }

    /**
     * @param string $fileName
     * @param string $sourceRef
     * @param string $workDir
     */
    protected function packageHg($fileName, $sourceRef, $workDir)
    {
        $format  = ($this->format == 'tarball')?'tar':$this->format;
        $command = sprintf(
            'hg archive --rev %s --type %s %s',
            $sourceRef,
            $format,
            escapeshellarg(sprintf('%s/%s', $this->path, $fileName))
        );
        $this->process->execute($command, $output, $workDir);
    }
}