<?php

// Предполагается, что сессия уже запущена, если нет - уберите комментарий
// session_start();

/**
 * @class VkApi
 * @author Maslakov Alexander <jmas.ukraine@gmail.com>
 */
class VkApi
{
    public $apiKey;
    public $appId;
    public $login;
    public $password;
    public $authRedirectUrl;
    public $apiUrl = 'https://api.vk.com/method/';
    public $v = '2.0';
    private $_sid;
    
    
    public function __construct($options)
    {
        foreach ($options as $key=>$value) {
            $this->{$key} = $value;
        }
        
        $this->_auth();
    }
    
    
    private function _auth()
    {
        $token = file_get_contents('./Cookies.txt');
        
        if (isset($_GET['code'])) {
            $url  = 'https://oauth.vk.com/access_token?client_id='.$this->appId.'&client_secret='. $this->apiKey .'&code=' . $_GET['code'] . '&redirect_uri=' . $this->authRedirectUrl;
                        
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
            curl_setopt($ch, CURLOPT_HEADER, false);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_REFERER, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            
            $responce = curl_exec($ch);
            
            curl_close($ch);
    
            $responce = json_decode($responce);
        
            if (isset($responce->access_token)) {
                 file_put_contents('./Cookies.txt', $responce->access_token);
                 $token = $responce->access_token;
            } else {
                throw new Exception('VK API error.');
                //var_dump($responce);exit;
            }
        }
        
        if (empty($token)) {
            $url = "https://oauth.vk.com/authorize?client_id="
                   . $this->appId . "&redirect_uri=http://jmas.koding.com/agregator/vk.php&display=page&response_type=code&scope=video,offline";

            header('Location: ' . $url);
            exit;
        }
        
        $this->_accessToken = $token;
    }

    public function get($method, $params=false)
    {
		if (! $params) $params = array();

		$params['format'] = 'json';
        $url = $this->apiUrl . $method;
        $params['access_token'] = $this->_accessToken;
		
        ksort($params);
		
        $sig = '';
		
        foreach ($params as $k=>$v) {
			$sig .= $k.'='.$v;
		}
		
        $sig .= $this->apiKey;
		
        $params['sig'] = md5($sig);
		
        $query = $url . '?' . $this->_params($params);
        
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_URL, $query);
        curl_setopt($ch, CURLOPT_REFERER, $query);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)");
        $res = curl_exec($ch);
        curl_close($ch);

        return json_decode($res, true);
	}
    

    public function getLikesCountByUrl($pageUrl)
    {
        if (parse_url($pageUrl, PHP_URL_HOST) != parse_url($this->authRedirectUrl, PHP_URL_HOST)) {
            throw new Exception('Page URL not valid!');
        }
        
        $request = $this->get('likes.getList', array(
            'type' => 'sitepage',
            'owner_id' => $this->appId,
            'page_url' => $pageUrl,
        ));
        
        $this->_responce($request);
    }


    public function searchVideo($q, $offset)
    {        
        $request = $this->get('video.search', array(
            'q' => $q,
            'offset' => $offset,
        ));

        return $this->_responce($request);
    }
    
    
    public function getWall($owner_id, $offset = 0, $count = 100, $filter = 'owner')
    {
        $request = $this->get('wall.get', array(
            'owner_id' => '-' . $owner_id,
            'offset' => $offset,
            'count' => $count,
            'filter' => $filter,
        ));

        return $this->_responce($request);
    }
	


	private function _params($params) {
		$pice = array();
		foreach($params as $k=>$v) {
			$pice[] = $k.'='.urlencode($v);
		}
		return implode('&',$pice);
	}


    private function _responce($request)
    {
        if (isset($request['response'])) {
            return $request['response'];
        } else if (isset($request['error'])) {
            throw new Exception($request['error']['error_msg']);
        }
        
        return null;
    }  
}


// Пример использования
$vk = new VkApi(array(
    'apiKey' => '<API_KEY>',
    'appId' => '<APP_ID>',
    'login' => '<LOGIN>',
    'password' => '<PASSWORD>',
    'authRedirectUrl' => '<URL_OF_THIS_PAGE>',
));

echo '<pre>';
var_dump($vk->getWall($_GET['owner_id']));
echo '</pre>';