use \Bitrix\Main\EventManager;
use \Bitrix\Main\Event;
use \Bitrix\Main\Entity;
use \Bitrix\Sale\Order;
use \Bitrix\Sale\Payment;
use \Bitrix\Sale\PaySystem\Manager;
use \Bitrix\Sale\Shipment;
use \Bitrix\Sale\Helpers\Admin\Blocks\OrderBasketShipment;


$inst = EventManager::getInstance();
$inst-> addEventHandler('sale', 'OnBeforeCollectionDeleteItem', 'saveInfo');
$inst-> addEventHandler('sale', 'OnSaleOrderBeforeSaved', 'reverseInfo');

//Небольшая прослойка, возвращает доступные поля
/**
 * @param array $arValues
 * @param array $allowedFields
 * @return array $result
 */
function checkFields( $arValues, $allowedFields) {
   $result = array();
   foreach ( $arValues as $key => $value ) {
      if ( in_array( $key,$allowedFields ) && !in_array($key, array('ACCOUNT_NUMBER')) ) {
         $result[$key] = $value;
      }
   }
   return $result;
}

function saveInfo(\Bitrix\Main\Event $event ) {
   /**
    * @var \Bitrix\Sale\Shipment|\Bitrix\Sale\Payment $entity
    */
   if ( $_SESSION['BX_CML2_EXPORT'] ) {
      $entity = $event->getParameter('ENTITY');
      if ( $entity instanceof Shipment ) {
         if ( !is_array( $_SESSION['BX_CML2_EXPORT']['DELETED_SHIPMENTS'] )  )
            $_SESSION['BX_CML2_EXPORT']['DELETED_SHIPMENTS'] = array();
         if ( !$entity->isSystem() )
            $_SESSION['BX_CML2_EXPORT']['DELETED_SHIPMENTS'][] = checkFields( $entity->getFields()->getValues(), Shipment::getAvailableFields() );
      }
      if ( $entity instanceof Payment ) {
         if ( !is_array( $_SESSION['BX_CML2_EXPORT']['DELETED_PAYMENTS'] )  )
            $_SESSION['BX_CML2_EXPORT']['DELETED_PAYMENTS'] = array();
         $_SESSION['BX_CML2_EXPORT']['DELETED_PAYMENTS'][] = checkFields( $entity->getFields()->getValues(), Payment::getAvailableFields() );
      }
   }
   else {
      return;
   }
}

function reverseInfo(\Bitrix\Main\Event $event ) {
   /**
    * @var \Bitrix\Sale\Order $order
    * @var \Bitrix\Sale\ShipmentCollection $shipmentCollection
    * @var \Bitrix\Sale\Shipment $shipment
    * @var \Bitrix\Sale\PaymentCollection $paymentCollection
    * @var \Bitrix\Sale\Payment $payment
    * @var \Bitrix\Sale\PropertyValue $somePropValue
    * **/
   if ( $_SESSION['BX_CML2_EXPORT'] ) {
      $order = $event->getParameter("ENTITY");
      if ( $_SESSION['BX_CML2_EXPORT']['DELETED_SHIPMENTS'] ) {
         //Вернем отгрузки
         $shipmentCollection = $order->getShipmentCollection();
         $systemShipmentItemCollection = $shipmentCollection->getSystemShipment()->getShipmentItemCollection();$products = array();
         $basket = $order->getBasket();
         if ($basket)
         {
            /** @var \Bitrix\Sale\BasketItem $product */
            $basketItems = $basket->getBasketItems();
            foreach ($basketItems as $product)
            {
               $systemShipmentItem = $systemShipmentItemCollection->getItemByBasketCode($product->getBasketCode());
               if ($product->isBundleChild() || !$systemShipmentItem || $systemShipmentItem->getQuantity() <= 0)
                  continue;

               $products[] = array(
                  'AMOUNT' => $product->getQuantity(),
                  'BASKET_CODE' => $product->getBasketCode()
               );
            }
         }
         /** @var \Bitrix\Sale\Shipment $obShipment */
         /** @var array $shipmentFields */
         foreach ( $_SESSION['BX_CML2_EXPORT']['DELETED_SHIPMENTS'] as $shipmentFields ) {
            $fg = true;
            foreach( $shipmentCollection as $obShipment ) {
               if ($obShipment->isSystem())
                  continue;
               $usedFields = checkFields($obShipment->getFields()->getValues(), Shipment::getAvailableFields() );
               if ( count( array_diff_assoc( $shipmentFields, $usedFields) ) == 0 )
                  $fg = false; //доставка с такими полями уже есть
            }
            if ( $fg ) {
               $shipment = $shipmentCollection->createItem();
               $shipment->setFields( $shipmentFields );
               OrderBasketShipment::updateData($order, $shipment, $products);
            }
         }
         unset( $_SESSION['BX_CML2_EXPORT']['DELETED_SHIPMENTS'] );
      }
      if ( $_SESSION['BX_CML2_EXPORT']['DELETED_PAYMENTS'] ) {
         //Вернем оплаты
         $paymentCollection = $order->getPaymentCollection();
         /** @var \Bitrix\Sale\Payment $obPayment */
         /** @var array $paymentFields */
         foreach ( $_SESSION['BX_CML2_EXPORT']['DELETED_PAYMENTS'] as $paymentFields ) {
            $fg = true;
            foreach( $paymentCollection as $obPayment ) {
               $usedFields = checkFields( $obPayment->getFields()->getValues(), Payment::getAvailableFields() );
               if ( count( array_diff_assoc( $paymentFields, $usedFields) ) == 0 )
                  $fg = false; //такая оплата уже есть
            }
            if ( $fg ) {
               $payment = $paymentCollection->createItem();
               $payment->setFields( $paymentFields );
            }
         }
         unset( $_SESSION['BX_CML2_EXPORT']['DELETED_PAYMENTS'] );
      }
      //Проверим сумму заказа
      $paymentCollection = $order->getPaymentCollection();
      if ( ($sumP = $paymentCollection->getSum() ) != ($sumO = $order->getPrice() ) ) {
         $diff = $sumO - $sumP;
         $innerPayID = Manager::getInnerPaySystemId();
         foreach ( $paymentCollection as $payment ) {
            if ( $payment->getPaymentSystemId() != $innerPayID) {
               $newVal = floatval($payment->getField("SUM")) + floatval($diff);
               $payment->setField("SUM", $newVal);
            }
         }
      }
   }
}