/* 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();

	$_TNT_LOGIN = '';
	$_TNT_PASSWORD = '';
	$_TNT_ACCOUNTNUMBER = '';

	//calculate total weight
	$w = 0;
	foreach ($DATA['items'] as $i) {
		$w += $i['quantity']*$i['grams']/1000;
	}

	$packages = array(
		array('weight'=>$w, 'length'=>18, 'width'=>12, 'height'=>4),
	);

	$TNT = new TNTAPI($_TNT_LOGIN,$_TNT_PASSWORD,$_TNT_ACCOUNTNUMBER);
	$TNT->setOrigin('',$DATA['origin']['city'],$DATA['origin']['province'],$DATA['origin']['postal_code'],'');
	$TNT->setDestination('',$DATA['destination']['city'],$DATA['destination']['province'],$DATA['destination']['postal_code'],'','');
	$r = $TNT->getRate($packages);
	if ($r) {
		foreach ($r as $_r) {
			$_RATES[] = array(
				"service_name" => $_r['name'],
				"service_code" => $_r['name'],
				"total_price" => $_r['amount']*100, //in cents
				"currency" => "AUD",
			);
		}
	}

	return $_RATES;

	/* do not edit below this line */

}