To check the product has any discount

To check the product has any discount

if(class_exists('\Wdr\App\Router')) {
    global $product;
    $discountManager = \Wdr\App\Router::$manage_discount;
    $discountCalculator = $discountManager::$calculator;
    if(method_exists($discountCalculator, 'saleBadgeDisplayChecker')){
        $has_discount = $discountCalculator->saleBadgeDisplayChecker($product, true);
        if($has_discount === true){
            // this product is applicable for a discount through discount rules plugin
        }
    }
}