ap2i/src/Validator/Constraints/LessThanFieldValidator.php

<?php
declare(strict_types=1);

namespace App\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class LessThanFieldValidator extends ConstraintValidator
{
    public function validate(mixed $object, Constraint $constraint): void
    {
        if (!$constraint instanceof LessThanField) {
            throw new UnexpectedTypeException($constraint, LessThanField::class);
        }

        if (!is_object($object)) {
            return; // Only validate objects
        }

        $fieldValue = $object->{$constraint->field} ?? null;
        $comparedValue = $object->{$constraint->comparedTo} ?? null;

        if ($fieldValue === null || $comparedValue === null) {
            return; // Skip if either value is null
        }

        if (!$fieldValue instanceof \DateTimeInterface || !$comparedValue instanceof \DateTimeInterface) {
            return;
        }

        if ($fieldValue->getTimestamp() >= $comparedValue->getTimestamp()) {
            $this->context
                ->buildViolation($constraint->message)
                ->setParameter('{{ field }}', $constraint->field)
                ->setParameter('{{ comparedTo }}', $constraint->comparedTo)
                ->atPath($constraint->field)
                ->addViolation();
        }
    }
}