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<?php

namespace Practice\Slideshow\Controller\Product;

use \Magento\Framework\App\Action\Action as Action;
use \Magento\Framework\App\Action\Context as Context;
use \Magento\Framework\View\Result\PageFactory as PageFactory;
use \Magento\Catalog\Model\ProductFactory as ProductFactory;
use \Magento\Catalog\Helper\Image as Image;
use \Magento\Framework\Controller\Result\JsonFactory as JsonFactory;

class Load extends	Action
{
    /**
     * @var \Magento\Catalog\Model\ProductFactory
     */
    protected $_productFactory;

    /** @var \Magento\Framework\View\Result\PageFactory */

    protected $resultPageFactory;

    /**
     * @var \Magento\Catalog\Helper\Image
     */
    protected $_helperImage;

    /**
     * @var \Magento\Framework\Controller\Result\JsonFactory
     */
    protected $_jsonFactory;

    /**
     * Load constructor.
     * @param Context $context
     * @param PageFactory $resultPageFactory
     * @param ProductFactory $productFactory
     * @param Image $helperImage
     * @param JsonFactory $jsonFactory
     */
    public function __construct(
        Context $context,
        PageFactory $resultPageFactory,
        ProductFactory $productFactory,
        Image $helperImage,
        JsonFactory $jsonFactory
    )
    {
        $this->resultPageFactory    = $resultPageFactory;
        $this->_productFactory      = $productFactory;
        $this->_helperImage         = $helperImage;
        $this->_jsonFactory         = $jsonFactory;
        parent::__construct($context);
    }
    public function	execute()
    {
        $result = $this->_jsonFactory->create();
        $imagesToSlideshow = [];
        $product = $this->_productFactory->create()->load(2);
        $images = $product->getMediaGalleryImages();

        $dataProduct = [
            'product_name'  => $product->getName(),
            'product_url'   => $product->getProductUrl(),
            'product_price' => $product->getPrice()
        ];

        foreach ($images as $image){
            $imageFinal = $this->_helperImage->init($product,$image->getId())
                ->constrainOnly(TRUE)
                ->keepAspectRatio(TRUE)
                ->keepTransparency(TRUE)
                ->keepFrame(FALSE)
                ->resize(300, 300)
                ->getUrl();
            $imagesToSlideshow[] = $imageFinal;
        }
        $dataProduct['images'] = $imagesToSlideshow;
        return $result->setData($imagesToSlideshow);
    }
}