<?php

/*
 * This file is part of the Cilex framework.
 *
 * (c) Mike van Riel <mike.vanriel@naenius.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Cilex\Provider;

use Cilex\Application;
use Cilex\ServiceProviderInterface;
use Symfony\Component\Yaml;

class ConfigServiceProvider implements ServiceProviderInterface
{
    public function register(Application $app)
    {
        $app['config'] = $app->share(
            function () use ($app) {
                if (!file_exists($app['config.path'])) {
                    throw new \InvalidArgumentException(
                        $app['config.path'] . ' is not a valid path to the '
                        .'configuration'
                    );
                }

                $fullpath = explode('.', $app['config.path']);

                switch (strtolower(end($fullpath))) {
                    case 'php':
                        $result = include($app['config.path']);
                        break;
                    case 'yml':
                        $parser = new Yaml\Parser();
                        $result = new \ArrayObject(
                            $parser->parse(file_get_contents($app['config.path']))
                        );
                        break;
                    case 'xml':
                        $result = simplexml_load_file($app['config.path']);
                        break;
                    case 'json':
                        $result = json_decode(file_get_contents($app['config.path']));

                        if (null == $result) {

                            throw new \InvalidArgumentException(
                                'Unable to decode the configuration file: ' . $app['config.path']
                            );
                        }
                        break;
                    default:
                        throw new \InvalidArgumentException(
                            'Unable to load configuration; the provided file extension was not recognized. '
                            .'Only yml, xml or json allowed'
                        );
                        break;
                }

                return $result;
            }
        );
    }
}