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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form\ChoiceList\Loader;

use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
use Symfony\Component\Form\ChoiceList\ChoiceListInterface;

/**
 * @author Jules Pietri <[email protected]>
 */
abstract class AbstractChoiceLoader implements ChoiceLoaderInterface
{
    /**
     * The loaded choices.
     *
     * @var iterable|null
     */
    private $choices;

    /**
     * @final
     *
     * {@inheritdoc}
     */
    public function loadChoiceList(?callable $value = null): ChoiceListInterface
    {
        return new ArrayChoiceList($this->choices ?? $this->choices = $this->loadChoices(), $value);
    }

    /**
     * {@inheritdoc}
     */
    public function loadChoicesForValues(array $values, ?callable $value = null)
    {
        if (!$values) {
            return [];
        }

        return $this->doLoadChoicesForValues($values, $value);
    }

    /**
     * {@inheritdoc}
     */
    public function loadValuesForChoices(array $choices, ?callable $value = null)
    {
        if (!$choices) {
            return [];
        }

        if ($value) {
            // if a value callback exists, use it
            return array_map(function ($item) use ($value) { return (string) $value($item); }, $choices);
        }

        return $this->doLoadValuesForChoices($choices);
    }

    abstract protected function loadChoices(): iterable;

    protected function doLoadChoicesForValues(array $values, ?callable $value): array
    {
        return $this->loadChoiceList($value)->getChoicesForValues($values);
    }

    protected function doLoadValuesForChoices(array $choices): array
    {
        return $this->loadChoiceList()->getValuesForChoices($choices);
    }
}