function calculate_shipping() {
if (self::$enabled=='yes') :
self::$shipping_total = 0;
self::$shipping_tax = 0;
self::$shipping_label = null;
$_cheapest_fee = '';
$_cheapest_method = '';
if (isset($_SESSION['_chosen_method_id'])) $chosen_method = $_SESSION['_chosen_method_id']; else $chosen_method = '';
$calc_cheapest = false;
if (!$chosen_method || empty($chosen_method)) $calc_cheapest = true;
self::reset_shipping_methods();
$_available_methods = self::get_available_shipping_methods();
if (sizeof($_available_methods)>0) :
foreach ($_available_methods as $method) :
$method->calculate_shipping();
$fee = $method->shipping_total;
if ($fee < $_cheapest_fee || !is_numeric($_cheapest_fee)) :
$_cheapest_fee = $fee;
$_cheapest_method = $method->id;
endif;
endforeach;
// Default to cheapest
if ($calc_cheapest || !isset($_available_methods[$chosen_method])) :
$chosen_method = $_cheapest_method;
endif;
if ($chosen_method) :
$_available_methods[$chosen_method]->choose();
self::$shipping_total = $_available_methods[$chosen_method]->shipping_total;
self::$shipping_tax = $_available_methods[$chosen_method]->shipping_tax;
self::$shipping_label = $_available_methods[$chosen_method]->title;
endif;
endif;
endif;
}
public static function reset_shipping()
{
self::$shipping_total = 0;
self::$shipping_tax = 0;
self::$shipping_label = null;
self::$shipping_error_message = null;
}
