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<?php
namespace CartForge\StockQty\Controller\Index;

use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\CatalogInventory\Api\StockStateInterface;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Framework\Controller\Result\JsonFactory;

class Index extends Action
{
    /**
     * @var StockStateInterface
     */
    protected $stockState;

    /**
     * @var ProductRepositoryInterface
     */
    protected $productRepository;

    /**
     * @var JsonFactory
     */
    protected $jsonFactory;

    /**
     * Constructor
     *
     * @param Context $context
     * @param StockStateInterface $stockState
     * @param ProductRepositoryInterface $productRepository
     * @param JsonFactory $jsonFactory
     */
    public function __construct(
        Context $context,
        StockStateInterface $stockState,
        ProductRepositoryInterface $productRepository,
        JsonFactory $jsonFactory
    ) {
        parent::__construct($context);
        $this->stockState = $stockState;
        $this->productRepository = $productRepository;
        $this->jsonFactory = $jsonFactory;
    }

    /**
     * Execute action based on request and return result
     *
     * @return \Magento\Framework\Controller\ResultInterface
     */
    public function execute()
    {
        $html = '';
        $sku = '';
        $productId = $this->getRequest()->getParam('product_id');

        if ($productId) {
            try {
                // Get stock quantity
                $stockQty = $this->stockState->getStockQty($productId);
                $html = __("Available Qty: ") . $stockQty;

                // Get product SKU
                $product = $this->productRepository->getById($productId);
                $sku = $product->getSku();
            } catch (\Magento\Framework\Exception\NoSuchEntityException $e) {
                $html = __("Product not found.");
            } catch (\Exception $e) {
                $html = __("An error occurred while processing your request.");
            }
        }

        /** @var \Magento\Framework\Controller\Result\Json $result */
        $result = $this->jsonFactory->create();
        return $result->setData(['content' => $html, 'sku' => $sku]);
    }
}