chill-bundles/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/MaxHolderValidator.php

<?php

namespace Chill\PersonBundle\Validator\Constraints\Household;

use Chill\MainBundle\Util\DateRangeCovering;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
use Symfony\Component\Validator\Exception\UnexpectedValueException;

class MaxHolderValidator extends ConstraintValidator
{
    private const MAX_HOLDERS = 2;

    public function validate($household, Constraint $constraint)
    {
        $holders = $household->getMembersHolder();

        if ($holders->count() <= self::MAX_HOLDERS) {
            return;
        }

        $covers = new DateRangeCovering(self::MAX_HOLDERS,
            $holders[0]->getStartDate()->getTimezone());

        foreach ($holders as $key => $member) {
            $covers->add($member->getStartDate(), $member->getEndDate(), $key);
        }

        $covers->compute();

        if ($covers->hasIntersections()) {
            foreach ($covers->getIntersections() as list($start, $end, $ids)) {
                $msg = $end === null ? $constraint->messageEndInfinite : 
                    $constraint->message;

                $this->context->buildViolation($msg)
                    ->setParameters([
                        'start' => $start->format('d-m-Y'), // TODO fix when MessageParameter works with timezone
                        'end' => $end === null ? null : $end->format('d-m-Y')
                    ])
                    ->addViolation();
            }
        }

    }
}