<?php declare(strict_types=1);namespace Shopware\Core\Checkout\Cart\LineItem\Group;use Shopware\Core\Checkout\Cart\Cart;use Shopware\Core\Checkout\Cart\Exception\InvalidQuantityException;use Shopware\Core\Checkout\Cart\Exception\LineItemNotStackableException;use Shopware\Core\Checkout\Cart\LineItem\LineItem;use Shopware\Core\Checkout\Cart\LineItem\LineItemCollection;use Shopware\Core\Checkout\Cart\LineItem\LineItemFlatCollection;use Shopware\Core\Checkout\Cart\LineItem\LineItemQuantitySplitter;use Shopware\Core\System\SalesChannel\SalesChannelContext;class LineItemGroupBuilder{ /** * @var LineItemGroupServiceRegistry */ private $registry; /** * @var LineItemGroupRuleMatcherInterface */ private $ruleMatcher; /** * @var LineItemQuantitySplitter */ private $quantitySplitter; public function __construct(LineItemGroupServiceRegistry $registry, LineItemGroupRuleMatcherInterface $ruleMatcher, LineItemQuantitySplitter $lineItemQuantitySplitter) { $this->registry = $registry; $this->ruleMatcher = $ruleMatcher; $this->quantitySplitter = $lineItemQuantitySplitter; } /** * Searches for all packages that can be built from the provided list of groups. * Every line item will be taken from the cart and only the ones that are left will * be checked for upcoming groups. * * @param LineItemGroupDefinition[] $groupDefinitions */ public function findGroupPackages(array $groupDefinitions, Cart $cart, SalesChannelContext $context): LineItemGroupBuilderResult { $result = new LineItemGroupBuilderResult(); // filter out all promotion items $cartProducts = $this->getCartProducts($cart); // split quantities into separate line items // so we have a real list of products like we would have // them when holding it in our actual hands. $restOfCart = $this->splitQuantities($cartProducts, $context); foreach ($groupDefinitions as $groupDefinition) { $sorter = $this->registry->getSorter($groupDefinition->getSorterKey()); $packager = $this->registry->getPackager($groupDefinition->getPackagerKey()); // we have to sort our items first // otherwise it would be a "random" order when // adjusting the rest of our cart... $restOfCart = $sorter->sort($restOfCart); // try as long as groups can be // found for the current definition while (true) { $itemsToConsider = $this->ruleMatcher->getMatchingItems($groupDefinition, $restOfCart, $context); // now build a package with our packager $group = $packager->buildGroupPackage($groupDefinition->getValue(), $itemsToConsider, $context); // if we have no found items in our group, quit if (!$group->hasItems()) { break; } // append the currently found group of items // to our group definition inside our result object $result->addGroup($groupDefinition, $group); // decrease rest of cart items for next search $restOfCart = $this->adjustRestOfCart($group->getItems(), $restOfCart); } } return $result; } /** * This is a very important function. * It removes our line items that are found in the group and returns the rest of the cart items. * So if we have 4 line items of 2 products with each quantity 1, and want to remove a product with qt 2, * then 2 line items will be removed and the new rest of the cart is being returned. * * @param LineItemQuantity[] $foundItems */ private function adjustRestOfCart(array $foundItems, LineItemFlatCollection $restOfCart): LineItemFlatCollection { // a holder for all foundItems indexed by lineItemId /** @var LineItemQuantity[] $lineItemsToRemove */ $lineItemsToRemove = []; // we prepare the removeLineItemIds array with all LineItemQuantity objects indexed by lineItemId foreach ($foundItems as $itemToRemove) { if (isset($lineItemsToRemove[$itemToRemove->getLineItemId()])) { $quantity = $lineItemsToRemove[$itemToRemove->getLineItemId()]; $lineItemsToRemove[$itemToRemove->getLineItemId()]->setQuantity($quantity->getQuantity() + $itemToRemove->getQuantity()); continue; } $lineItemsToRemove[$itemToRemove->getLineItemId()] = $itemToRemove; } /** @var array $lineItemsToRemoveIDs */ $lineItemsToRemoveIDs = array_keys($lineItemsToRemove); $newRestOfCart = new LineItemFlatCollection(); // this is our running buffer // for the items that need to be removed $deleteBuffer = []; // make sure we have an ID index for // all our delete-items with a qty of 0 foreach (array_keys($lineItemsToRemove) as $id) { $deleteBuffer[$id] = 0; } foreach ($restOfCart as $item) { // if its a totally different item // just add it to the rest of our cart if (!in_array($item->getId(), $lineItemsToRemoveIDs, true)) { $newRestOfCart->add($item); } else { // we have an item that should be removed // now we have to calculate how many of the item position (qty diff) // or if we have even reached our max amount of quantities to remove for this item $maxRemoveMeta = $lineItemsToRemove[$item->getId()]->getQuantity(); $alreadyDeletedCount = $deleteBuffer[$item->getId()]; // now check if we can remove our current item completely // or if we have a sub quantity that still needs to be // added to the rest of the cart if ($alreadyDeletedCount + $item->getQuantity() <= $maxRemoveMeta) { // remove completely $deleteBuffer[$item->getId()] += $item->getQuantity(); } else { $toDeleteCount = $maxRemoveMeta - $alreadyDeletedCount; $keepCount = $item->getQuantity() - $toDeleteCount; // mark our diff as "deleted" $deleteBuffer[$item->getId()] += $toDeleteCount; // add the keep count to our item // and the item to the rest of our cart $item->setQuantity($keepCount); $newRestOfCart->add($item); } } } return $newRestOfCart; } private function getCartProducts(Cart $cart): LineItemCollection { return $cart->getLineItems()->filterType(LineItem::PRODUCT_LINE_ITEM_TYPE); } /** * @throws InvalidQuantityException * @throws LineItemNotStackableException */ private function splitQuantities(LineItemCollection $cartItems, SalesChannelContext $context): LineItemFlatCollection { $items = []; foreach ($cartItems as $item) { for ($i = 1; $i <= $item->getQuantity(); ++$i) { $tmpItem = $this->quantitySplitter->split($item, 1, $context); $items[] = $tmpItem; } } return new LineItemFlatCollection($items); }}