<?php

namespace TFGraphics\SmartImport\Intelligence;

use TFGraphics\SmartImport\Domain\Contracts\CategoryResolverInterface;
use TFGraphics\SmartImport\Domain\Contracts\MappingEngineInterface;
use TFGraphics\SmartImport\Domain\DTO\AttributeDTO;
use TFGraphics\SmartImport\Domain\DTO\CategoryDTO;
use TFGraphics\SmartImport\Domain\DTO\ProductDTO;
use TFGraphics\SmartImport\Commerce\ProductMacroCategory;
use TFGraphics\SmartImport\Domain\Search\MediaType;
use TFGraphics\SmartImport\Mapping\MappingContext;

final class CategoryResolver implements CategoryResolverInterface
{
    private MappingEngineInterface $mappingEngine;

    public function __construct(MappingEngineInterface $mappingEngine)
    {
        $this->mappingEngine = $mappingEngine;
    }

    public function resolve(ProductDTO $productDTO): ?CategoryDTO
    {
        $result = $this->mappingEngine->map($productDTO, new MappingContext([
            'source' => 'ProductIntelligence',
            'target' => 'category_suggestion',
        ]));

        $mappedProduct = $result->getData();
        if ($mappedProduct instanceof ProductDTO && $mappedProduct->getCategories() !== []) {
            $category = $mappedProduct->getCategories()[0];
            if ($category instanceof CategoryDTO) {
                return $category;
            }
        }

        if ($productDTO->getCategories() !== []) {
            $category = $productDTO->getCategories()[0];
            if ($category instanceof CategoryDTO) {
                return $category;
            }
        }

        $mediaType = $this->mediaType($productDTO);
        $macroCategory = ProductMacroCategory::defaultForMediaType($mediaType);
        $label = ProductMacroCategory::label($macroCategory, $mediaType);
        $slug = trim((string) preg_replace('/[^a-z0-9]+/i', '-', strtolower($label)), '-');

        return new CategoryDTO(
            $label,
            $slug !== '' ? $slug : null,
            'Categoria suggerita automaticamente dal motore di intelligence.'
        );
    }

    private function mediaType(ProductDTO $product): string
    {
        foreach ($product->getAttributes() as $attribute) {
            if ($attribute instanceof AttributeDTO && strtolower(trim($attribute->getName())) === 'media_type') {
                return MediaType::normalize($attribute->getValue());
            }
        }

        return MediaType::UNKNOWN;
    }
}