<?php
declare(strict_types=1);

namespace Esun\Homepage\Block;

use Magento\Catalog\Block\Product\AbstractProduct;
use Magento\Catalog\Block\Product\Context;
use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\Product\Visibility;
use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
use Magento\Cms\Model\Template\FilterProvider;
use Magento\Framework\DataObject\IdentityInterface;
use Magento\Store\Model\ScopeInterface;

class NewProduct extends AbstractProduct implements IdentityInterface
{
    private const XML_PATH_SKUS = 'esun_homepage/new_product/skus';
    private const FEATURE_ATTRIBUTE = 'homepage_feature_content';
    private const GALLERY_ATTRIBUTE = 'homepage_gallery_content';

    /**
     * @var Product[]|null
     */
    private ?array $products = null;

    public function __construct(
        Context $context,
        private readonly CollectionFactory $productCollectionFactory,
        private readonly Visibility $productVisibility,
        private readonly FilterProvider $filterProvider,
        array $data = []
    ) {
        parent::__construct($context, $data);
    }

    /**
     * @return Product[]
     */
    public function getProducts(): array
    {
        if ($this->products !== null) {
            return $this->products;
        }

        $skus = $this->getConfiguredSkus();
        if (!$skus) {
            return $this->products = [];
        }

        $collection = $this->productCollectionFactory->create();
        $collection->setStoreId((int) $this->_storeManager->getStore()->getId());
        $this->_addProductAttributesAndPrices($collection);
        $collection->addAttributeToSelect([self::FEATURE_ATTRIBUTE, self::GALLERY_ATTRIBUTE]);
        $collection->addStoreFilter();
        $collection->addAttributeToFilter('sku', ['in' => $skus]);
        $collection->addAttributeToFilter(
            'visibility',
            ['in' => $this->productVisibility->getVisibleInSiteIds()]
        );
        $collection->addAttributeToFilter(
            'status',
            Product\Attribute\Source\Status::STATUS_ENABLED
        );

        $productsBySku = [];
        foreach ($collection as $product) {
            $productsBySku[strtolower((string) $product->getSku())] = $product;
        }

        $this->products = [];
        foreach ($skus as $sku) {
            $key = strtolower($sku);
            if (isset($productsBySku[$key])) {
                $this->products[] = $productsBySku[$key];
            }
        }

        return $this->products;
    }

    public function getFeatureContent(Product $product): string
    {
        return $this->filterContent((string) $product->getData(self::FEATURE_ATTRIBUTE));
    }

    public function getGalleryContent(Product $product): string
    {
        return $this->filterContent((string) $product->getData(self::GALLERY_ATTRIBUTE));
    }

    public function getIdentities(): array
    {
        $identities = [];
        foreach ($this->getProducts() as $product) {
            $identities = array_merge($identities, $product->getIdentities());
        }

        return array_values(array_unique($identities));
    }

    private function getConfiguredSkus(): array
    {
        $value = (string) $this->_scopeConfig->getValue(
            self::XML_PATH_SKUS,
            ScopeInterface::SCOPE_STORE
        );
        $skus = preg_split('/[\s,;]+/', $value, -1, PREG_SPLIT_NO_EMPTY) ?: [];

        return array_values(array_unique(array_map('trim', $skus)));
    }

    private function filterContent(string $content): string
    {
        if (trim($content) === '') {
            return '';
        }

        return $this->filterProvider->getPageFilter()->filter($content);
    }
}