/* 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();

	$DATA = enrichProductDetails($DATA);

	//free shipping threshold (NB: Bespoke does not have visibility of discount coupons, all thresholding will be done on the pre-discounted cart total)
	$freeShippingTreshold = 100;

	//rate for each product type (all prices in cents)
	$config = array(
		'ProductType1' => array('rate'=>1000, 'sub'=>400),
		'ProductType2' => array('rate'=>999, 'sub'=>500),
		'ProductType3' => array('rate'=>1099, 'sub'=>500),
	);

	$defaultrate = 500;

	$cartTotal = 0;
	$groupedByType = array();
	//go through cart and group by type
	foreach ($DATA['items'] as $item) {
		$productType = $item['product_type'];
		$quantity = $item['quantity'];
		$item['quantity'] = 1; //reset qty as we're adding them into the grouped array individually
		for ($i=0; $i<$quantity; $i++) {
			//insert each unit in as a separate entry
			$groupedByType[$productType][] = $item;
		}
	}

	$rate = 0;
	foreach ($groupedByType as $productType => $items) {
		if (isset($config[$productType])) {
			$first = $config[$productType]['rate'];
			$sub = $config[$productType]['sub'];
		} else {
			//default
			$first = $defaultrate;
			$sub = $defaultrate;
		}
		foreach ($items as $item) {
			$cartTotal += $item['price']/100;
		}
		$qty = count($items);
		if ($qty > 1) {
			$rate += $first + $sub*($qty-1);
		} else {
			$rate += $first;
		}
	}

	//round up nearest cent
	$rate = ceil($rate);

	//apply free shipping
	if ($cartTotal > $freeShippingTreshold) $rate = 0;

	$_RATES[] = array(
		"service_name" => "Standard Shipping",
		"service_code" => "STANDARD",
		"total_price" => $rate, //in cents
		"currency" => "USD",
	);

	return $_RATES;

	/* do not edit below this line */

}