Cart.php

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<?php
namespace Magento\Checkout\Model;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Catalog\Model\Product;
use Magento\Checkout\Model\Cart\CartInterface;
use Magento\Framework\DataObject;
use Magento\Framework\Exception\NoSuchEntityException;

class Cart extends DataObject implements CartInterface
{
    protected $_summaryQty;

    protected $_productIds;

    protected $_eventManager;

    protected $_scopeConfig;

    protected $_storeManager;

    protected $_resourceCart;

    protected $_checkoutSession;

    protected $_customerSession;

    protected $messageManager;

    protected $stockRegistry;

    protected $stockState;

    protected $quoteRepository;

    protected $productRepository;

    private $requestInfoFilter;

    public function __construct(
        \Magento\Framework\Event\ManagerInterface $eventManager,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Checkout\Model\ResourceModel\Cart $resourceCart,
        Session $checkoutSession,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\CatalogInventory\Api\StockRegistryInterface $stockRegistry,
        \Magento\CatalogInventory\Api\StockStateInterface $stockState,
        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository,
        ProductRepositoryInterface $productRepository,
        array $data = []
    ) {
        $this->_eventManager = $eventManager;
        $this->_scopeConfig = $scopeConfig;
        $this->_storeManager = $storeManager;
        $this->_resourceCart = $resourceCart;
        $this->_checkoutSession = $checkoutSession;
        $this->_customerSession = $customerSession;
        $this->messageManager = $messageManager;
        $this->stockRegistry = $stockRegistry;
        $this->stockState = $stockState;
        $this->quoteRepository = $quoteRepository;
        parent::__construct($data);
        $this->productRepository = $productRepository;
    }

    protected function _getResource()
    {
        return $this->_resourceCart;
    }

    public function getCheckoutSession()
    {
        return $this->_checkoutSession;
    }

    public function getCustomerSession()
    {
        return $this->_customerSession;
    }

    public function getItems()
    {
        if (!$this->getQuote()->getId()) {
            return [];
        }
        return $this->getQuote()->getItemsCollection();
    }

    public function getQuoteProductIds()
    {
        $products = $this->getData('product_ids');
        if ($products === null) {
            $products = [];
            foreach ($this->getQuote()->getAllItems() as $item) {
                $products[$item->getProductId()] = $item->getProductId();
            }
            $this->setData('product_ids', $products);
        }
        return $products;
    }

    public function getQuote()
    {
        if (!$this->hasData('quote')) {
            $this->setData('quote', $this->_checkoutSession->getQuote());
        }
        return $this->_getData('quote');
    }

    public function setQuote(\Magento\Quote\Model\Quote $quote)
    {
        $this->setData('quote', $quote);
        return $this;
    }

    protected function reinitializeState()
    {
        $quote = $this->getQuote()->setCheckoutMethod('');
        $this->_checkoutSession->setCartWasUpdated(true);
        // TODO: Move this logic to Multishipping module as plug-in.
        // reset for multiple address checkout
        if ($this->_checkoutSession->getCheckoutState() !== Session::CHECKOUT_STATE_BEGIN
            && $this->_checkoutSession->getCheckoutState() !== null) {
            $quote->removeAllAddresses()->removePayment();
            $this->_checkoutSession->resetCheckout();
        }
        return $this;
    }

    public function addOrderItem($orderItem, $qtyFlag = null)
    {
        /* @var $orderItem \Magento\Sales\Model\Order\Item */
        if ($orderItem->getParentItem() === null) {
            $storeId = $this->_storeManager->getStore()->getId();
            try {
                $product = $this->productRepository->getById($orderItem->getProductId(), false, $storeId, true);
            } catch (NoSuchEntityException $e) {
                return $this;
            }
            $info = $orderItem->getProductOptionByCode('info_buyRequest');
            $info = new \Magento\Framework\DataObject($info);
            if ($qtyFlag === null) {
                $info->setQty($orderItem->getQtyOrdered());
            } else {
                $info->setQty(1);
            }

            $this->addProduct($product, $info);
        }
        return $this;
    }

    protected function _getProduct($productInfo)
    {
        $product = null;
        if ($productInfo instanceof Product) {
            $product = $productInfo;
            if (!$product->getId()) {
                throw new \Magento\Framework\Exception\LocalizedException(
                    __("The product wasn't found. Verify the product and try again.")
                );
            }
        } elseif (is_int($productInfo) || is_string($productInfo)) {
            $storeId = $this->_storeManager->getStore()->getId();
            try {
                $product = $this->productRepository->getById($productInfo, false, $storeId);
            } catch (NoSuchEntityException $e) {
                throw new \Magento\Framework\Exception\LocalizedException(
                    __("The product wasn't found. Verify the product and try again."),
                    $e
                );
            }
        } else {
            throw new \Magento\Framework\Exception\LocalizedException(
                __("The product wasn't found. Verify the product and try again.")
            );
        }
        $currentWebsiteId = $this->_storeManager->getStore()->getWebsiteId();
        if (!is_array($product->getWebsiteIds()) || !in_array($currentWebsiteId, $product->getWebsiteIds())) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __("The product wasn't found. Verify the product and try again.")
            );
        }
        return $product;
    }

    protected function _getProductRequest($requestInfo)
    {
        if ($requestInfo instanceof \Magento\Framework\DataObject) {
            $request = $requestInfo;
        } elseif (is_numeric($requestInfo)) {
            $request = new \Magento\Framework\DataObject(['qty' => $requestInfo]);
        } elseif (is_array($requestInfo)) {
            $request = new \Magento\Framework\DataObject($requestInfo);
        } else {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('We found an invalid request for adding product to quote.')
            );
        }
        $this->getRequestInfoFilter()->filter($request);

        return $request;
    }

    public function addProduct($productInfo, $requestInfo = null)
    {
        $product = $this->_getProduct($productInfo);
        $request = $this->_getProductRequest($requestInfo);
        $productId = $product->getId();

        if ($productId) {
            $stockItem = $this->stockRegistry->getStockItem($productId, $product->getStore()->getWebsiteId());
            $minimumQty = $stockItem->getMinSaleQty();
            //If product quantity is not specified in request and there is set minimal qty for it
            if ($minimumQty
                && $minimumQty > 0
                && !$request->getQty()
            ) {
                $request->setQty($minimumQty);
            }

            try {
                $result = $this->getQuote()->addProduct($product, $request);
            } catch (\Magento\Framework\Exception\LocalizedException $e) {
                $this->_checkoutSession->setUseNotice(false);
                $result = $e->getMessage();
            }
            if (is_string($result)) {
                if ($product->hasOptionsValidationFail()) {
                    $redirectUrl = $product->getUrlModel()->getUrl(
                        $product,
                        ['_query' => ['startcustomization' => 1]]
                    );
                } else {
                    $redirectUrl = $product->getProductUrl();
                }
                $this->_checkoutSession->setRedirectUrl($redirectUrl);
                if ($this->_checkoutSession->getUseNotice() === null) {
                    $this->_checkoutSession->setUseNotice(true);
                }
                throw new \Magento\Framework\Exception\LocalizedException(__($result));
            }
        } else {
            throw new \Magento\Framework\Exception\LocalizedException(__('The product does not exist.'));
        }

        $this->_eventManager->dispatch(
            'checkout_cart_product_add_after',
            ['quote_item' => $result, 'product' => $product]
        );
        $this->_checkoutSession->setLastAddedProductId($productId);
        return $this;
    }

    public function addProductsByIds($productIds)
    {
        $allAvailable = true;
        $allAdded = true;

        if (!empty($productIds)) {
            foreach ($productIds as $productId) {
                $productId = (int)$productId;
                if (!$productId) {
                    continue;
                }
                $product = $this->_getProduct($productId);
                if ($product->getId() && $product->isVisibleInCatalog()) {
                    try {
                        $this->getQuote()->addProduct($product);
                    } catch (\Exception $e) {
                        $allAdded = false;
                    }
                } else {
                    $allAvailable = false;
                }
            }

            if (!$allAvailable) {
                $this->messageManager->addErrorMessage(__("We don't have some of the products you want."));
            }
            if (!$allAdded) {
                $this->messageManager->addErrorMessage(__("We don't have as many of some products as you want."));
            }
        }
        return $this;
    }

    public function suggestItemsQty($data)
    {
        foreach ($data as $itemId => $itemInfo) {
            if (!isset($itemInfo['qty'])) {
                continue;
            }
            $qty = (float)$itemInfo['qty'];
            if ($qty <= 0) {
                continue;
            }

            $quoteItem = $this->getQuote()->getItemById($itemId);
            if (!$quoteItem) {
                continue;
            }

            $product = $quoteItem->getProduct();
            if (!$product) {
                continue;
            }

            $data[$itemId]['before_suggest_qty'] = $qty;
            $data[$itemId]['qty'] = $this->stockState->suggestQty(
                $product->getId(),
                $qty,
                $product->getStore()->getWebsiteId()
            );
        }
        return $data;
    }

    public function updateItems($data)
    {
        $infoDataObject = new \Magento\Framework\DataObject($data);
        $this->_eventManager->dispatch(
            'checkout_cart_update_items_before',
            ['cart' => $this, 'info' => $infoDataObject]
        );

        $qtyRecalculatedFlag = false;
        foreach ($data as $itemId => $itemInfo) {
            $item = $this->getQuote()->getItemById($itemId);
            if (!$item) {
                continue;
            }

            if (!empty($itemInfo['remove']) || isset($itemInfo['qty']) && $itemInfo['qty'] == '0') {
                $this->removeItem($itemId);
                continue;
            }

            $qty = isset($itemInfo['qty']) ? (double)$itemInfo['qty'] : false;
            if ($qty > 0) {
                $item->setQty($qty);

                if ($item->getHasError()) {
                    throw new \Magento\Framework\Exception\LocalizedException(__($item->getMessage()));
                }

                if (isset($itemInfo['before_suggest_qty']) && $itemInfo['before_suggest_qty'] != $qty) {
                    $qtyRecalculatedFlag = true;
                    $this->messageManager->addNoticeMessage(
                        __('Quantity was recalculated from %1 to %2', $itemInfo['before_suggest_qty'], $qty),
                        'quote_item' . $item->getId()
                    );
                }
            }
        }

        if ($qtyRecalculatedFlag) {
            $this->messageManager->addNoticeMessage(
                __('We adjusted product quantities to fit the required increments.')
            );
        }

        $this->_eventManager->dispatch(
            'checkout_cart_update_items_after',
            ['cart' => $this, 'info' => $infoDataObject]
        );

        return $this;
    }

    public function removeItem($itemId)
    {
        $this->getQuote()->removeItem($itemId);
        return $this;
    }

    public function save()
    {
        $this->_eventManager->dispatch('checkout_cart_save_before', ['cart' => $this]);

        $this->getQuote()->getBillingAddress();
        $this->getQuote()->getShippingAddress()->setCollectShippingRates(true);
        $this->getQuote()->collectTotals();
        $this->quoteRepository->save($this->getQuote());
        $this->_checkoutSession->setQuoteId($this->getQuote()->getId());
        $this->_eventManager->dispatch('checkout_cart_save_after', ['cart' => $this]);
        $this->reinitializeState();
        return $this;
    }

    public function saveQuote()
    {
        $this->save();
    }

    public function truncate()
    {
        $this->getQuote()->removeAllItems();
        return $this;
    }

    public function getProductIds()
    {
        if (null === $this->_productIds) {
            $this->_productIds = [];
            if ($this->getSummaryQty() > 0) {
                foreach ($this->getQuote()->getAllItems() as $item) {
                    $this->_productIds[] = $item->getProductId();
                }
            }
            $this->_productIds = array_unique($this->_productIds);
        }
        return $this->_productIds;
    }

    public function getSummaryQty()
    {
        $quoteId = $this->_checkoutSession->getQuoteId();

        //If there is no quote id in session trying to load quote
        //and get new quote id. This is done for cases when quote was created
        //not by customer (from backend for example).
        if (!$quoteId && $this->_customerSession->isLoggedIn()) {
            $this->_checkoutSession->getQuote();
            $quoteId = $this->_checkoutSession->getQuoteId();
        }

        if ($quoteId && $this->_summaryQty === null) {
            $useQty = $this->_scopeConfig->getValue(
                'checkout/cart_link/use_qty',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
            $this->_summaryQty = $useQty ? $this->getItemsQty() : $this->getItemsCount();
        }
        return $this->_summaryQty;
    }

    public function getItemsCount()
    {
        return $this->getQuote()->getItemsCount() * 1;
    }

    public function getItemsQty()
    {
        return $this->getQuote()->getItemsQty() * 1;
    }

    public function updateItem($itemId, $requestInfo = null, $updatingParams = null)
    {
        try {
            $item = $this->getQuote()->getItemById($itemId);
            if (!$item) {
                throw new \Magento\Framework\Exception\LocalizedException(__('This quote item does not exist.'));
            }
            $productId = $item->getProduct()->getId();
            $product = $this->_getProduct($productId);
            $request = $this->_getProductRequest($requestInfo);

            if ($productId) {
                $stockItem = $this->stockRegistry->getStockItem($productId, $product->getStore()->getWebsiteId());
                $minimumQty = $stockItem->getMinSaleQty();
                // If product was not found in cart and there is set minimal qty for it
                if ($minimumQty
                    && $minimumQty > 0
                    && !$request->getQty()
                    && !$this->getQuote()->hasProductId($productId)
                ) {
                    $request->setQty($minimumQty);
                }
            }

            $result = $this->getQuote()->updateItem($itemId, $request, $updatingParams);
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->_checkoutSession->setUseNotice(false);
            $result = $e->getMessage();
        }

        if (is_string($result)) {
            if ($this->_checkoutSession->getUseNotice() === null) {
                $this->_checkoutSession->setUseNotice(true);
            }
            throw new \Magento\Framework\Exception\LocalizedException(__($result));
        }

        $this->_eventManager->dispatch(
            'checkout_cart_product_update_after',
            ['quote_item' => $result, 'product' => $product]
        );
        $this->_checkoutSession->setLastAddedProductId($productId);
        return $result;
    }

    private function getRequestInfoFilter()
    {
        if ($this->requestInfoFilter === null) {
            $this->requestInfoFilter = \Magento\Framework\App\ObjectManager::getInstance()
                ->get(\Magento\Checkout\Model\Cart\RequestInfoFilterInterface::class);
        }
        return $this->requestInfoFilter;
    }
}