DateTimeTransformation.php

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<?php

declare(strict_types=1);

namespace ILIAS\Refinery\To\Transformation;

use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use ILIAS\Refinery\Constraint;
use ILIAS\Refinery\ProblemBuilder;
use UnexpectedValueException;
use DateTimeImmutable;
use Exception;

class DateTimeTransformation implements Constraint
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;
    use ProblemBuilder;

    private string $error = '';

    public function transform($from): DateTimeImmutable
    {
        $this->check($from);
        return new DateTimeImmutable($from);
    }

    public function getError(): string
    {
        return $this->error;
    }

    public function check($value)
    {
        if (!$this->accepts($value)) {
            throw new UnexpectedValueException($this->getErrorMessage($value));
        }

        return null;
    }

    public function accepts($value): bool
    {
        try {
            new DateTimeImmutable($value);
        } catch (Exception $e) {
            $this->error = $e->getMessage();
            return false;
        }
        return true;
    }

    public function problemWith($value): ?string
    {
        if (!$this->accepts($value)) {
            return $this->getErrorMessage($value);
        }

        return null;
    }
}