<?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\Repository;

use Composer\Package\Loader\ArrayLoader;
use Composer\Package\PackageInterface;
use Composer\Package\Version\VersionParser;
use Composer\Json\JsonFile;
use Composer\Cache;
use Composer\Config;
use Composer\IO\IOInterface;
use Composer\Util\RemoteFilesystem;

/**
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
class ComposerRepository extends ArrayRepository implements NotifiableRepositoryInterface, StreamableRepositoryInterface
{
    protected $config;
    protected $url;
    protected $io;
    protected $cache;
    protected $notifyUrl;
    protected $minimalPackages;
    protected $loader;

    public function __construct(array $repoConfig, IOInterface $io, Config $config)
    {
        if (!preg_match('{^\w+://}', $repoConfig['url'])) {
            // assume http as the default protocol
            $repoConfig['url'] = 'http://'.$repoConfig['url'];
        }
        $repoConfig['url'] = rtrim($repoConfig['url'], '/');
        if (function_exists('filter_var') && version_compare(PHP_VERSION, '5.3.3', '>=') && !filter_var($repoConfig['url'], FILTER_VALIDATE_URL)) {
            throw new \UnexpectedValueException('Invalid url given for Composer repository: '.$repoConfig['url']);
        }

        $this->config = $config;
        $this->url = $repoConfig['url'];
        $this->io = $io;
        $this->cache = new Cache($io, $config->get('home').'/cache/'.preg_replace('{[^a-z0-9.]}i', '-', $this->url));
        $this->loader = new ArrayLoader();
    }

    /**
     * {@inheritDoc}
     */
    public function notifyInstall(PackageInterface $package)
    {
        if (!$this->notifyUrl || !$this->config->get('notify-on-install')) {
            return;
        }

        // TODO use an optional curl_multi pool for all the notifications
        $url = str_replace('%package%', $package->getPrettyName(), $this->notifyUrl);

        $params = array(
            'version' => $package->getPrettyVersion(),
            'version_normalized' => $package->getVersion(),
        );
        $opts = array('http' =>
            array(
                'method'  => 'POST',
                'header'  => 'Content-type: application/x-www-form-urlencoded',
                'content' => http_build_query($params, '', '&'),
                'timeout' => 3,
            )
        );

        $context = stream_context_create($opts);
        @file_get_contents($url, false, $context);
    }

    public function getMinimalPackages()
    {
        if (isset($this->minimalPackages)) {
            return $this->minimalPackages;
        }

        $repoData = $this->loadDataFromServer();

        $this->minimalPackages = array();
        $versionParser = new VersionParser;

        foreach ($repoData as $package) {
            $version = !empty($package['version_normalized']) ? $package['version_normalized'] : $versionParser->normalize($package['version']);
            $data = array(
                'name' => strtolower($package['name']),
                'repo' => $this,
                'version' => $version,
                'raw' => $package,
            );
            if (!empty($package['replace'])) {
                $data['replace'] = $package['replace'];
            }
            if (!empty($package['provide'])) {
                $data['provide'] = $package['provide'];
            }

            $this->minimalPackages[] = $data;
        }

        return $this->minimalPackages;
    }

    public function loadPackage(array $data, $id)
    {
        $package = $this->loader->load($data);
        $package->setId($id);
        $package->setRepository($data['repo']);

        return $package;
    }

    protected function initialize()
    {
        parent::initialize();

        $repoData = $this->loadDataFromServer();

        foreach ($repoData as $package) {
            $this->addPackage($this->loader->load($package));
        }
    }

    protected function loadDataFromServer()
    {
        if (!extension_loaded('openssl') && 'https' === substr($this->url, 0, 5)) {
            throw new \RuntimeException('You must enable the openssl extension in your php.ini to load information from '.$this->url);
        }

        try {
            $json = new JsonFile($this->url.'/packages.json', new RemoteFilesystem($this->io));
            $data = $json->read();

            if (!empty($data['notify'])) {
                if ('/' === $data['notify'][0]) {
                    $this->notifyUrl = preg_replace('{(https?://[^/]+).*}i', '$1' . $data['notify'], $this->url);
                } else {
                    $this->notifyUrl = $data['notify'];
                }
            }

            $this->cache->write('packages.json', json_encode($data));
        } catch (\Exception $e) {
            if ($contents = $this->cache->read('packages.json')) {
                $this->io->write('<warning>'.$e->getMessage().'</warning>');
                $this->io->write('<warning>'.$this->url.' could not be loaded, package information was loaded from the local cache and may be out of date</warning>');
                $data = json_decode($contents, true);
            } else {
                throw $e;
            }
        }

        return $this->loadIncludes($data);
    }

    protected function loadIncludes($data)
    {
        $packages = array();

        // legacy repo handling
        if (!isset($data['packages']) && !isset($data['includes'])) {
            foreach ($data as $pkg) {
                foreach ($pkg['versions'] as $metadata) {
                    $packages[] = $metadata;
                }
            }

            return;
        }

        if (isset($data['packages'])) {
            foreach ($data['packages'] as $package => $versions) {
                foreach ($versions as $version => $metadata) {
                    $packages[] = $metadata;
                }
            }
        }

        if (isset($data['includes'])) {
            foreach ($data['includes'] as $include => $metadata) {
                if ($this->cache->sha1($include) === $metadata['sha1']) {
                    $includedData = json_decode($this->cache->read($include), true);
                } else {
                    $json = new JsonFile($this->url.'/'.$include, new RemoteFilesystem($this->io));
                    $includedData = $json->read();
                    $this->cache->write($include, json_encode($includedData));
                }
                $packages = array_merge($packages, $this->loadIncludes($includedData));
            }
        }

        return $packages;
    }
}