<?php
declare(strict_types=1);

namespace Esun\Homepage\Block;

use Esun\ImageManager\Model\Category;
use Esun\ImageManager\Model\Image;
use Esun\ImageManager\Model\ImageProvider;
use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\View\Element\Template;
use Magento\Framework\View\Element\Template\Context;
use Magento\Store\Model\ScopeInterface;

class InnovativeMaterials extends Template implements IdentityInterface
{
    private const XML_PATH_CATEGORY_ID = 'esun_homepage/innovative_materials/category_id';

    /**
     * @var array<int, array<string, int|string>>|null
     */
    private ?array $items = null;

    public function __construct(
        Context $context,
        private readonly ImageProvider $imageProvider,
        array $data = []
    ) {
        parent::__construct($context, $data);
    }

    /**
     * @return array<int, array<string, int|string>>
     */
    public function getItems(): array
    {
        if ($this->items === null) {
            $this->items = array_values(array_filter(
                $this->imageProvider->getImagesByCategoryId($this->getCategoryId()),
                static fn (array $item): bool => trim((string) $item['thumbnail_url']) !== ''
            ));
        }

        return $this->items;
    }

    public function getCacheKeyInfo(): array
    {
        return [
            'ESUN_HOMEPAGE_INNOVATIVE_MATERIALS',
            (int) $this->_storeManager->getStore()->getId(),
            $this->getCategoryId(),
        ];
    }

    public function getIdentities(): array
    {
        $identities = [];
        $categoryId = $this->getCategoryId();

        if ($categoryId > 0) {
            $identities[] = Category::CACHE_TAG . '_' . $categoryId;
        }

        foreach ($this->getItems() as $item) {
            $identities[] = Image::CACHE_TAG . '_' . (int) $item['id'];
        }

        return array_values(array_unique($identities));
    }

    private function getCategoryId(): int
    {
        return (int) $this->_scopeConfig->getValue(
            self::XML_PATH_CATEGORY_ID,
            ScopeInterface::SCOPE_STORE
        );
    }
}