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<?php
/* --------------------------------------------------------------
   SharedShoppingCartRepository.inc.php 2016-04-08 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2016 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

/**
 * Class SharedShoppingCartRepository
 *
 * @category   System
 * @package    SharedShoppingCart
 */
class SharedShoppingCartRepository implements SharedShoppingCartRepositoryInterface
{
    /**
     * @var SharedShoppingCartReader
     */
    protected $reader;

    /**
     * @var SharedShoppingCartWriter
     */
    protected $writer;

    /**
     * @var SharedShoppingCartDeleter
     */
    protected $deleter;


    /**
     * SharedShoppingCartRepository constructor.
     *
     * @param \SharedShoppingCartReader  $reader  Instance to fetch shared shopping cart data.
     * @param \SharedShoppingCartWriter  $writer  Instance to insert and update shared shopping cart data.
     * @param \SharedShoppingCartDeleter $deleter Instance to remove shared shopping cart data.
     */
    public function __construct(SharedShoppingCartReader $reader,
                                SharedShoppingCartWriter $writer,
                                SharedShoppingCartDeleter $deleter)
    {
        $this->reader  = $reader;
        $this->writer  = $writer;
        $this->deleter = $deleter;
    }


    /**
     * Stores the cart and returns the hash
     *
     * @param StringType  $jsonShoppingCart JSON representation of the cart
     * @param IdType|null $userId           The user ID of the user who is sharing the cart
     *
     * @return string The hash of the cart
     * @throws \InvalidArgumentException
     */
    public function storeShoppingCart(StringType $jsonShoppingCart, IdType $userId = null)
    {
        $shoppingCartHash = md5($jsonShoppingCart->asString());
        $this->writer->storeShoppingCart(new StringType($shoppingCartHash), $jsonShoppingCart, $userId);

        return $shoppingCartHash;
    }


    /**
     * Gets the content in JSON format of the shopping cart corresponding to the hash
     *
     * @param StringType $shoppingCartHash Hash of the shopping cart
     *
     * @return string JSON representation of the shopping cart
     */
    public function getShoppingCart(StringType $shoppingCartHash)
    {
        return $this->reader->getShoppingCart($shoppingCartHash);
    }


    /**
     * Deletes all shared shopping carts that are expired
     *
     * @param DateTime $expirationDate All shared shopping carts older than that date are expired
     */
    public function deleteShoppingCartsOlderThan(DateTime $expirationDate)
    {
        $this->deleter->deleteShoppingCartsOlderThan($expirationDate);
    }
    
    
    /**
     * Deletes all shared shopping carts by a given customer ID.
     *
     * @param \IdType $customerId
     */
    public function deleteShoppingCartsByCustomerId(IdType $customerId)
    {
        $this->deleter->deleteShoppingCartsByCustomerId($customerId);
    }
    
    
    /**
     * Gets a collection of all shared shopping carts by a given customer ID.
     *
     * @param \IdType $customerId
     *
     * @return \SharedShoppingCartCollection
     */
    public function getShoppingCartsByCustomerId(IdType $customerId)
    {
        return $this->reader->getShoppingCartsByCustomerId($customerId);
    }
}