<?php
declare(strict_types=1);

namespace Esun\Homepage\Block;

use Esun\Catalog\Model\Product\CardPriceResolver;
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\Framework\App\Http\Context as HttpContext;
use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\Pricing\PriceCurrencyInterface;
use Magento\Store\Model\ScopeInterface;
use Magento\Swatches\Helper\Data as SwatchHelper;
use Magento\Swatches\Helper\Media as SwatchMediaHelper;
use Magento\Swatches\Model\Swatch;

class HotSaleFilament extends AbstractProduct implements IdentityInterface
{
    private const XML_PATH = 'esun_homepage/hot_sale_filament/';

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

    /**
     * @var array<int, array<int, array<string, int|string>>>
     */
    private array $colorSwatches = [];

    public function __construct(
        Context $context,
        private readonly CollectionFactory $productCollectionFactory,
        private readonly Visibility $productVisibility,
        private readonly SwatchHelper $swatchHelper,
        private readonly SwatchMediaHelper $swatchMediaHelper,
        private readonly PriceCurrencyInterface $priceCurrency,
        private readonly HttpContext $httpContext,
        private readonly CardPriceResolver $cardPriceResolver,
        array $data = []
    ) {
        parent::__construct($context, $data);
    }

    public function getSubtitle(): string
    {
        return trim((string) $this->getConfig('subtitle'));
    }

    public function getExploreAllUrl(): string
    {
        return trim((string) $this->getConfig('explore_all_url'));
    }

    /**
     * @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(['short_description']);
        $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 getShortDescription(Product $product): string
    {
        $description = html_entity_decode(
            strip_tags((string) $product->getData('short_description')),
            ENT_QUOTES | ENT_HTML5
        );

        return trim((string) preg_replace('/\s+/u', ' ', $description));
    }

    /**
     * @return array<int, array<string, int|string>>
     */
    public function getColorSwatches(Product $product): array
    {
        $productId = (int) $product->getId();
        if (isset($this->colorSwatches[$productId])) {
            return $this->colorSwatches[$productId];
        }

        if ($product->getTypeId() !== 'configurable') {
            return $this->colorSwatches[$productId] = [];
        }

        $colorAttribute = null;
        foreach ($product->getTypeInstance()->getConfigurableAttributes($product) as $attribute) {
            if ($attribute->getProductAttribute()->getAttributeCode() === 'color') {
                $colorAttribute = $attribute->getProductAttribute();
                $colorAttribute->setStoreId((int) $this->_storeManager->getStore()->getId());
                break;
            }
        }
        if ($colorAttribute === null) {
            return $this->colorSwatches[$productId] = [];
        }

        $childIdsByGroup = $product->getTypeInstance()->getChildrenIds($productId);
        $childIds = array_values(array_unique(array_map(
            'intval',
            array_merge(...array_values($childIdsByGroup ?: [[]]))
        )));
        if (!$childIds) {
            return $this->colorSwatches[$productId] = [];
        }

        $childCollection = $this->productCollectionFactory->create();
        $childCollection->setStoreId((int) $this->_storeManager->getStore()->getId());
        $childCollection->addIdFilter($childIds);
        $childCollection->addAttributeToSelect(['color', 'sku', 'image', 'small_image', 'thumbnail']);
        $childCollection->addAttributeToFilter(
            'status',
            Product\Attribute\Source\Status::STATUS_ENABLED
        );
        $childCollection->setOrder('entity_id', 'ASC');

        $childrenByOption = [];
        foreach ($childCollection as $childProduct) {
            $optionId = (int) $childProduct->getData('color');
            if ($optionId > 0 && !isset($childrenByOption[$optionId])) {
                $childrenByOption[$optionId] = $childProduct;
            }
        }
        if (!$childrenByOption) {
            return $this->colorSwatches[$productId] = [];
        }

        $swatchData = $this->swatchHelper->getSwatchesByOptionsId(array_keys($childrenByOption));
        $result = [];
        foreach ($childrenByOption as $optionId => $childProduct) {
            $swatch = $swatchData[$optionId] ?? [];
            $type = (int) ($swatch['type'] ?? Swatch::SWATCH_TYPE_EMPTY);
            $value = (string) ($swatch['value'] ?? '');
            $result[] = [
                'id' => $optionId,
                'sku' => (string) $childProduct->getSku(),
                'label' => (string) $colorAttribute->getSource()->getOptionText($optionId),
                'type' => $type,
                'value' => $value,
                'product_image' => $this->getProductImageUrl($childProduct, 'category_page_grid'),
                'product_image_large' => $this->getProductImageUrl($childProduct, 'product_page_image_large'),
                'image' => $type === Swatch::SWATCH_TYPE_VISUAL_IMAGE && $value !== ''
                    ? $this->swatchMediaHelper->getSwatchAttributeImage(
                        Swatch::SWATCH_IMAGE_NAME,
                        $value
                    )
                    : '',
            ];
        }

        return $this->colorSwatches[$productId] = $result;
    }

    public function getProductImageUrl(Product $product, string $imageId = 'category_page_grid'): string
    {
        return (string) $this->getImage($product, $imageId)->getImageUrl();
    }

    public function getFormattedFinalPrice(Product $product): string
    {
        return $this->formatPrice($this->getFinalPriceValue($product));
    }

    public function getFormattedRegularPrice(Product $product): string
    {
        return $this->formatPrice($this->getRegularPriceValue($product));
    }

    public function hasRegularPrice(Product $product): bool
    {
        return $this->getRegularPriceValue($product) > $this->getFinalPriceValue($product);
    }

    public function getCacheKeyInfo(): array
    {
        return [
            'ESUN_HOMEPAGE_HOT_SALE_FILAMENT',
            (int) $this->_storeManager->getStore()->getId(),
            (string) $this->httpContext->getValue(\Magento\Customer\Model\Context::CONTEXT_GROUP),
            sha1(implode('|', $this->getConfiguredSkus())),
            sha1($this->getSubtitle()),
            sha1($this->getExploreAllUrl()),
        ];
    }

    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->getConfig('skus');
        $skus = preg_split('/[\s,;]+/', $value, -1, PREG_SPLIT_NO_EMPTY) ?: [];

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

    private function getConfig(string $field): mixed
    {
        return $this->_scopeConfig->getValue(
            self::XML_PATH . $field,
            ScopeInterface::SCOPE_STORE
        );
    }

    private function getFinalPriceValue(Product $product): float
    {
        return $this->cardPriceResolver->getFinalPrice($product);
    }

    private function getRegularPriceValue(Product $product): float
    {
        return $this->cardPriceResolver->getRegularPrice($product);
    }

    private function formatPrice(float $price): string
    {
        return $this->priceCurrency->format(
            $price,
            false,
            PriceCurrencyInterface::DEFAULT_PRECISION,
            $this->_storeManager->getStore()
        );
    }
}