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/**
 * Class GoogleURL
 * Acortador de url ok
 */
class GoogleURL
{

	private $apiURL = 'https://www.googleapis.com/urlshortener/v1/url';

	function __construct($apiKey = 'AIzaSyAkjlc5gfuYZPtL8Hvd-N_L7HTsLENsN6s')
	{
		//creamos la url de solicitud con nuestra key pública
		$this->apiURL = $this->apiURL . '?key=' . $apiKey;
	}

	//convierte una url larga en una corta
	public function acortar($url)
	{
		$data = $this->cURL($url, true);
		return isset($data->id) ? $data->id : '';
	}

	//convierte una url corta en la real (larga)
	public function original($url)
	{
		$data = $this->cURL($url, false);
		return isset($data->longUrl) ? $data->longUrl : '';
	}

	//enviamos y recogemos los datos del api de google
	private function cURL($url, $post = true)
	{
		$ch = curl_init();
		if ($post) {
			curl_setopt($ch, CURLOPT_URL, $this->apiURL);
			curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
			curl_setopt($ch, CURLOPT_POST, true);
			curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(array('longUrl' => $url)));
		} else {
			curl_setopt($ch, CURLOPT_URL, $this->apiURL . '&shortUrl=' . $url);
		}
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		$json = curl_exec($ch);
		curl_close($ch);
		return (object)json_decode($json);
	}
}