<?php
declare(strict_types=1);

namespace Esun3d\LanguageUrlStoreResolver\Model;

use Magento\Store\Model\StoreManagerInterface;

class LanguageResolver
{
    /**
     * @var StoreViewRegistry
     */
    private $storeViewRegistry;

    /** @var StoreManagerInterface */
    private $storeManager;

    public function __construct(StoreViewRegistry $storeViewRegistry, StoreManagerInterface $storeManager)
    {
        $this->storeViewRegistry = $storeViewRegistry;
        $this->storeManager = $storeManager;
    }

    public function resolveFromPath(string $pathInfo): ?string
    {
        $firstSegment = $this->getFirstSegment($pathInfo);

        if ($firstSegment === null) {
            return null;
        }

        $language = strtolower($firstSegment);

        $allowed = $this->storeViewRegistry->isLanguageInWebsite(
            $language,
            (int)$this->storeManager->getWebsite()->getId()
        );

        return $allowed ? $language : null;
    }

    private function getFirstSegment(string $pathInfo): ?string
    {
        $pathInfo = trim($pathInfo, '/');

        if ($pathInfo === '') {
            return null;
        }

        $segments = explode('/', $pathInfo);

        return $segments[0] !== '' ? $segments[0] : null;
    }
}