SetConversionValueObserver.php

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<?php
namespace Magento\GoogleAdwords\Observer;

use Magento\Framework\Event\ObserverInterface;

class SetConversionValueObserver implements ObserverInterface
{
    protected $_helper;

    protected $_collection;

    public function __construct(
        \Magento\GoogleAdwords\Helper\Data $helper,
        \Magento\Framework\Registry $registry,
        \Magento\Sales\Model\ResourceModel\Order\Collection $collection
    ) {
        $this->_helper = $helper;
        $this->_collection = $collection;
        $this->_registry = $registry;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!($this->_helper->isGoogleAdwordsActive() && $this->_helper->isDynamicConversionValue())) {
            return $this;
        }
        $orderIds = $observer->getEvent()->getOrderIds();
        if (!$orderIds || !is_array($orderIds)) {
            return $this;
        }
        $this->_collection->addFieldToFilter('entity_id', ['in' => $orderIds]);

        $conversionValue = 0;
        $conversionCurrency = false;
        $sendOrderCurrency = $this->_helper->hasSendConversionValueCurrency();
        foreach ($this->_collection as $order) {
            $conversionValue += $sendOrderCurrency ? $order->getGrandTotal() : $order->getBaseGrandTotal();
            $conversionCurrency = $sendOrderCurrency ? $order->getOrderCurrencyCode() : false;
        }
        $this->_registry->register(
            \Magento\GoogleAdwords\Helper\Data::CONVERSION_VALUE_CURRENCY_REGISTRY_NAME,
            $conversionCurrency
        );
        $this->_registry->register(
            \Magento\GoogleAdwords\Helper\Data::CONVERSION_VALUE_REGISTRY_NAME,
            $conversionValue
        );
        return $this;
    }
}