discounts (tmp)

$productsInst = \Aero\Tools\Iblock\Catalog\Products::getInstanceByCode();
$products = $productsInst->getElements([
        "select" => ["ID", "IBLOCK_ID", "CODE"],
        "filter" => ["ACTIVE" => "Y"],
        "nav" => ["nTopCount" => 200]
    ]
);

$salesInst = \Aero\Tools\Hlblock\Prototype::getInstance("FilterSale");
$filterSalesKeys = array_keys($salesInst->getElements([
    "select" => ["ID", "UF_XML_ID"],
    "indexArray" => "UF_XML_ID"
]));

$arProductMainDiscounts = [];
foreach ($products as $product) {

    $arDiscounts = CCatalogDiscount::GetDiscountByProduct(
        $product["ID"],
        $USER->GetUserGroupArray(),
        "N",
        [],
        "s1"
    );
    if (!empty($arDiscounts)) {

        $filterDiscounts = [];
        foreach ($arDiscounts as $discount) {
            if (in_array($discount["ID"], $filterSalesKeys)) {
                $filterDiscounts[] = $discount;
            }
        }
        if (!empty($filterDiscounts)) {
            $arProductMainDiscounts[$product["ID"]] = getMaxPriorityDiscount($filterDiscounts);
        }
    }
}

function getMaxPriorityDiscount($discounts)
{
    $maxPriorityDiscount = reset($discounts);
    $maxPriority = intval($maxPriorityDiscount["PRIORITY"]);
    foreach ($discounts as $discount) {
        $priority = intval($discount["PRIORITY"]);
        if ($priority >= $maxPriority) {
            $maxPriorityDiscount = $discount;
            $maxPriority = $priority;
        }
    }
    return $maxPriorityDiscount;
}