<?php
declare(strict_types=1);

namespace Esun\Catalog\Observer\Adminhtml;

use Esun\Catalog\Setup\Patch\Data\AddMixStepPricesAttribute;
use Magento\Catalog\Model\Product;
use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class SaveMixStepPrices implements ObserverInterface
{
    public function execute(Observer $observer): void
    {
        $product = $observer->getEvent()->getProduct();
        $controller = $observer->getEvent()->getController();
        if (!$product instanceof Product
            || $product->getTypeId() !== Configurable::TYPE_CODE
            || !$controller
        ) {
            return;
        }

        $post = $controller->getRequest()->getPostValue();
        $productData = is_array($post['product'] ?? null) ? $post['product'] : [];
        $attributeCode = AddMixStepPricesAttribute::ATTRIBUTE_CODE;
        if (!array_key_exists($attributeCode, $productData)) {
            return;
        }

        $value = $this->unwrapNestedValue($productData[$attributeCode], $attributeCode);
        $attribute = $product->getResource()->getAttribute($attributeCode);
        if (!$attribute) {
            return;
        }

        $product->setData($attributeCode, is_array($value) ? $value : []);
        $attribute->getBackend()->beforeSave($product);
        $product->getResource()->saveAttribute($product, $attributeCode);
    }

    private function unwrapNestedValue(mixed $value, string $attributeCode): mixed
    {
        if (is_array($value) && isset($value[$attributeCode]) && is_array($value[$attributeCode])) {
            return $value[$attributeCode];
        }

        return $value;
    }
}