<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\InventoryConfigurableProductAdminUi\Observer;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\Catalog\Controller\Adminhtml\Product\Save;
use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Exception\InputException;
use Magento\InventoryApi\Api\Data\SourceItemInterface;
use Magento\InventoryCatalogApi\Model\GetSkusByProductIdsInterface;
use Magento\InventoryCatalogApi\Model\SourceItemsProcessorInterface;
use Psr\Log\LoggerInterface;

/**
 * Process source items for configurable children products during product saving via controller.
 */
class ProcessSourceItemsObserver implements ObserverInterface
{
    /**
     * @var SourceItemsProcessorInterface
     */
    private $sourceItemsProcessor;

    /**
     * @var GetSkusByProductIdsInterface
     */
    private $getSkusByProductIdsInterface;

    /**
     * @var LoggerInterface
     */
    private $logger;

    /**
     * @param SourceItemsProcessorInterface $sourceItemsProcessor
     * @param GetSkusByProductIdsInterface $getSkusByProductIdsInterface
     * @param LoggerInterface $logger
     */
    public function __construct(
        SourceItemsProcessorInterface $sourceItemsProcessor,
        GetSkusByProductIdsInterface $getSkusByProductIdsInterface,
        LoggerInterface $logger
    ) {
        $this->sourceItemsProcessor = $sourceItemsProcessor;
        $this->getSkusByProductIdsInterface = $getSkusByProductIdsInterface;
        $this->logger = $logger;
    }

    /**
     * Process source items for configurable matrix products.
     *
     * @param EventObserver $observer
     *
     * @return void
     */
    public function execute(EventObserver $observer)
    {
        /** @var ProductInterface $product */
        $product = $observer->getEvent()->getProduct();
        if ($product->getTypeId() !== Configurable::TYPE_CODE) {
            return;
        }
        /** @var Save $controller */
        $controller = $observer->getEvent()->getController();
        $configurableMatrix = $controller->getRequest()->getParam('configurable-matrix-serialized', '');

        if ($configurableMatrix != '') {
            $productsData = json_decode($configurableMatrix, true);
            foreach ($productsData as $key => $productData) {
                if (isset($productData['quantity_per_source'])) {
                    $quantityPerSource = is_array($productData['quantity_per_source'])
                        ? $productData['quantity_per_source']
                        : [];

                    // get sku by child id, because child sku can be changed if product with such sku already exists.
                    $childProductId = $product->getExtensionAttributes()->getConfigurableProductLinks()[$key];
                    $childProductSku = $this->getSkusByProductIdsInterface->execute([$childProductId])[$childProductId];
                    try {
                        $this->processSourceItems($quantityPerSource, $childProductSku);
                    } catch (InputException $e) {
                        $this->logger->error($e->getLogMessage());
                        continue;
                    }
                }
            }
        }
    }

    /**
     * Process source items for given product sku.
     *
     * @param array $sourceItems
     * @param string $productSku
     * @return void
     * @throws InputException
     */
    private function processSourceItems(array $sourceItems, string $productSku)
    {
        foreach ($sourceItems as $key => $sourceItem) {
            $sourceItems[$key][SourceItemInterface::QUANTITY] = $sourceItems[$key]['quantity_per_source'];

            if (!isset($sourceItem[SourceItemInterface::STATUS])) {
                $sourceItems[$key][SourceItemInterface::STATUS]
                    = $sourceItems[$key][SourceItemInterface::QUANTITY] > 0 ? 1 : 0;
            }
        }

        $this->sourceItemsProcessor->execute($productSku, $sourceItems);
    }
}