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<?php
/**
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Shipping\Controller\Adminhtml\Order\Shipment;

use Magento\Backend\App\Action;
use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;

class View extends \Magento\Backend\App\Action implements HttpGetActionInterface
{
    /**
     * Authorization level of a basic admin session
     *
     * @see _isAllowed()
     */
    const ADMIN_RESOURCE = 'Magento_Sales::shipment';

    /**
     * @var \Magento\Shipping\Controller\Adminhtml\Order\ShipmentLoader
     */
    protected $shipmentLoader;

    /**
     * @var \Magento\Framework\View\Result\PageFactory
     */
    protected $resultPageFactory;

    /**
     * @var \Magento\Backend\Model\View\Result\ForwardFactory
     */
    protected $resultForwardFactory;

    /**
     * @param Action\Context $context
     * @param \Magento\Shipping\Controller\Adminhtml\Order\ShipmentLoader $shipmentLoader
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     * @param \Magento\Backend\Model\View\Result\ForwardFactory $resultForwardFactory
     */
    public function __construct(
        Action\Context $context,
        \Magento\Shipping\Controller\Adminhtml\Order\ShipmentLoader $shipmentLoader,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Backend\Model\View\Result\ForwardFactory $resultForwardFactory
    ) {
        $this->shipmentLoader = $shipmentLoader;
        $this->resultPageFactory = $resultPageFactory;
        $this->resultForwardFactory = $resultForwardFactory;
        parent::__construct($context);
    }

    /**
     * Shipment information page
     *
     * @return void
     */
    public function execute()
    {
        $this->shipmentLoader->setOrderId($this->getRequest()->getParam('order_id'));
        $this->shipmentLoader->setShipmentId($this->getRequest()->getParam('shipment_id'));
        $this->shipmentLoader->setShipment($this->getRequest()->getParam('shipment'));
        $this->shipmentLoader->setTracking($this->getRequest()->getParam('tracking'));
        $shipment = $this->shipmentLoader->load();
        if ($shipment) {
            $resultPage = $this->resultPageFactory->create();
            $resultPage->getLayout()->getBlock('sales_shipment_view')
                ->updateBackButtonUrl($this->getRequest()->getParam('come_from'));
            $resultPage->setActiveMenu('Magento_Sales::sales_shipment');
            $resultPage->getConfig()->getTitle()->prepend(__('Shipments'));
            $resultPage->getConfig()->getTitle()->prepend("#" . $shipment->getIncrementId());
            return $resultPage;
        } else {
            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setPath('sales/shipment');
            return $resultRedirect;
        }
    }
}