<?php

/**
 * 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.
 */

declare(strict_types=1);

namespace Chill\MainBundle\Form\ChoiceLoader;

use Chill\MainBundle\Entity\PostalCode;
use Chill\MainBundle\Repository\PostalCodeRepository;
use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
use function call_user_func;

/**
 * Class PostalCodeChoiceLoader.
 */
class PostalCodeChoiceLoader implements ChoiceLoaderInterface
{
    /**
     * @var array
     */
    protected $lazyLoadedPostalCodes = [];

    /**
     * @var PostalCodeRepository
     */
    protected $postalCodeRepository;

    /**
     * PostalCodeChoiceLoader constructor.
     */
    public function __construct(PostalCodeRepository $postalCodeRepository)
    {
        $this->postalCodeRepository = $postalCodeRepository;
    }

    /**
     * @param null $value
     */
    public function loadChoiceList($value = null): ChoiceListInterface
    {
        return new \Symfony\Component\Form\ChoiceList\ArrayChoiceList(
            $this->lazyLoadedPostalCodes,
            static function (?PostalCode $pc = null) use ($value) {
                return call_user_func($value, $pc);
            }
        );
    }

    /**
     * @param null $value
     *
     * @return array
     */
    public function loadChoicesForValues(array $values, $value = null)
    {
        $choices = [];

        foreach ($values as $value) {
            if (empty($value)) {
                $choices[] = null;
            } else {
                $choices[] = $this->postalCodeRepository->find($value);
            }
        }

        return $choices;
    }

    /**
     * @param null $value
     *
     * @return array|string[]
     */
    public function loadValuesForChoices(array $choices, $value = null)
    {
        $values = [];

        foreach ($choices as $choice) {
            if (null === $choice) {
                $values[] = null;

                continue;
            }

            $id = call_user_func($value, $choice);
            $values[] = $id;
            $this->lazyLoadedPostalCodes[$id] = $choice;
        }

        return $values;
    }
}