<?php
declare(strict_types=1);

namespace Chill\PersonBundle\Validator\Constraints\AccompanyingPeriod;

use Chill\MainBundle\Util\DateRangeCovering;
use Chill\PersonBundle\Entity\AccompanyingPeriodParticipation;
use Chill\PersonBundle\Validator\Constraints\AccompanyingPeriod\ParticipationOverlap;
use Doctrine\Common\Collections\Collection;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class ParticipationOverlapValidator extends ConstraintValidator
{
    private const MAX_PARTICIPATION = 1;

    public function validate($participations, Constraint $constraint)
    {
        if (!$constraint instanceof ParticipationOverlap) {
            throw new UnexpectedTypeException($constraint, ParticipationOverlap::class);
        }

        if (!$participations instanceof Collection) {
            throw new UnexpectedTypeException($participations, 'This should be a collection');
        }

        if (count($participations) <= self::MAX_PARTICIPATION) {
            return;
        }

        $overlaps = new DateRangeCovering(self::MAX_PARTICIPATION, $participations[0]->getStartDate()->getTimezone());
        $participationList = [];

        foreach ($participations as $participation) {

            if (!$participation instanceof AccompanyingPeriodParticipation) {
                throw new UnexpectedTypeException($participation, AccompanyingPeriodParticipation::class);
            }

            $personId = $participation->getPerson()->getId();

            $participationList[$personId][] = $participation;

        }

        foreach ($participationList as $group) {
            if (count($group) > 1) {
                foreach ($group as $p) {
                    $overlaps->add($p->getStartDate(), $p->getEndDate(), $p->getId());
                }
            }
        }

        $overlaps->compute();

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

                $this->context->buildViolation($msg)
                    ->setParameters([
                        '{{ start }}' => $start->format('d-m-Y'),
                        '{{ end }}' => $end === null ? null : $end->format('d-m-Y'),
                        '{{ ids }}' => $ids,
                    ])
                    ->addViolation();
            }
        }

    }
}