<?php

declare(strict_types=1);

/*
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Chill\MainBundle\Templating;

use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Contracts\Translation\TranslatorInterface;

final readonly class TranslatableStringHelper implements TranslatableStringHelperInterface
{
    private string $defaultLocale;

    public function __construct(private RequestStack $requestStack, private TranslatorInterface $translator, ParameterBagInterface $parameterBag)
    {
        $this->defaultLocale = $parameterBag->get('kernel.default_locale');
    }

    public function localize(array $translatableStrings): ?string
    {
        if ([] === $translatableStrings) {
            return null;
        }

        $request = $this->requestStack->getCurrentRequest();

        $language = null === $request ? $this->defaultLocale : $request->getLocale();

        if (\array_key_exists($language, $translatableStrings)) {
            return $translatableStrings[$language];
        }

        foreach ($this->translator->getFallbackLocales() as $locale) {
            if (\array_key_exists($locale, $translatableStrings)) {
                return $translatableStrings[$locale];
            }
        }

        // no fallback translation... trying the  first available
        $langs = array_keys($translatableStrings);

        if ([] === $langs) {
            return '';
        }

        return $translatableStrings[$langs[0]];
    }
}