<?php

namespace Httpcb;

use Phalcon\Mvc\User\Component;

use Opauth;

class OAuth extends Component
{
    /**
     * Configuration
     *
     * @var array
     */
    protected $_config = array(
        'path'         => '/oauth/',
        'callback_url' => '/oauth/callback'
    );

    protected $_oauth;

    protected $_callbackName = 'callback';

    public function __construct($config)
    {
        $config = $this->objectToArray($config->oauth);

        $this->_config = array_merge($this->_config, $config);

        $this->_oauth = new Opauth($this->_config, false);
    }

    /**
     * @return mixed|null|void
     */
    public function perform()
    {
        $strategy = $this->dispatcher->getParam('strategy', null, false);

        if ($strategy == $this->_callbackName) {
            return $this->getResponse();
        }

        $this->_oauth->run();
        exit;
    }

    /**
     * @return array|string
     */
    public function getResponse()
    {
        $response = null;
        switch($this->_oauth->env['callback_transport']) {
            case 'session':
                $response = $this->session->get('opauth');
                $this->session->remove('opauth');
                break;
            case 'post':
                $response = unserialize(base64_decode( $_POST['opauth'] ));
                break;
            case 'get':
                $response = unserialize(base64_decode( $_GET['opauth'] ));
                break;
        }

        $ret = $this->_validate($response, $reason);
        if ($ret === false) {
            return $reason;
        }
        return $response;
    }

    public function objectToArray($object)
    {
        if(!is_object($object) && !is_array($object))
        {
            return $object;
        }
        if(is_object($object))
        {
            $object = get_object_vars( $object );
        }
        return array_map(array($this,"objectToArray"), $object );
    }

    protected function _validate($response, &$reason)
    {
        if (isset($response['auth']) &&
            isset($response['timestamp']) &&
            isset($response['signature'])) {

            $hash = sha1(print_r($response['auth'], true));

            return $this->_oauth->validate($hash, $response['timestamp'],
                        $response['signature'], $reason);
        }

        $reason = "Invalid auth response";
        return false;
    }
}