/* This macro will be parsed as PHP code (see http://www.php.net)

The calculateshipping function is called every time a shipping calculation request is made by Shopify.

The function must return an array of available shipping options, otherwise no shipping options will be returned to your customers.
*/
function calculateshipping($DATA) {

    /* do not edit above this line */

    $_RATES = array();

    $_REDPACK_ID = 'YOUR REDPACK ID';
	$_REDPACK_PIN = 'YOUR REDAPCK PIN';

	$w = 0;
	foreach ($DATA['items'] as $i) {
		$w += $i['quantity']*$i['grams'];
	}

	$packages = array(
		array('weight'=>round($w/1000,1), 'length'=>10, 'width'=>10, 'height'=>10),
	);

	$RP = new RedpackAPI($_REDPACK_ID,$_REDPACK_PIN);
	$RP->setOrigin(null,null,$DATA['origin']['postal_code'],null);
	$RP->setDestination(null,null,$DATA['destination']['postal_code'],null,false);
	$r = $RP->getRate($packages);
	if ($r) {
		foreach ($r as $_r) {
            $_RATES[] = array(
				"service_name" => $_r['name'],
				"service_code" => $_r['code'],
				"total_price" => $_r['amount']*100, //in cents
				"currency" => "MXN",
			);
		}
	}

	return $_RATES;

    /* do not edit below this line */

}