Validation Problem Example

DriverParticipationRules.php

<?php

declare (strict_types = 1);

namespace Example\Domain;

use Example\Domain\CarInfo;

final class DriverParticipationRules
{
    private $minimumAge;
    private $maximumAge;
    private $minimumPoints;
    private $maximumMileage;
    private $allowedCarTypes;

    public function __construct(
      int $minimumAge,
      int $maximumAge,
      int $minimumPoints,
      int $maximumMileage,
      array $allowedCarTypes
    ) {
        $this->minimumAge = $minimumAge;
        $this->maximumAge = $maximumAge;
        $this->minimumPoints = $minimumPoints;
        $this->maximumMileage = $maximumMileage;
        $this->allowedCarTypes = $allowedCarTypes;
    }
    
    public function check(int $driverAge, int $driverPoints, CarInfo $carInfo): bool
    {
        return ($this->minimumAge <= $driverAge <= $this->maximumAge) 
          && $driverPoints >= $this->minimumPoints
          && $carInfo->getMileage() <= $this->maximumMileage
          && in_array($carInfo->getType(), $this->allowedCarTypes);
    }
}

ParticipateInRaceCommand.php

<?php

declare (strict_types = 1);

namespace Example\Application\Command;

use Example\Domain\CarInfo;

final class ParticipateInRaceCommand
{
    private $raceId;
    private $driverId; 

    public function __construct(
      int $raceId,
      int $driverId
    ) {
        $this->raceId = $raceId;
        $this->driverId = $driverId;
    }
    
    public function getRaceId(): int
    {
        return $this->raceId;
    }
  
    public function getDriverId(): int
    {
        return $this->driverId;
    }
}

Race.php

<?php

declare (strict_types = 1);

namespace Example\Domain;

use Example\Domain\Exception\InvalidArgumentException;
use Example\Domain\Exception\ParticipationRequirementsNotMetException;
use Example\Domain\DriverParticipationRules;

final class Race
{
    private $participants = [];
    private $driverParticipationRules;

    public function __construct(DriverParticipationRules $driverParticipationRules)
    {
        $this->driverParticipationRules = $driverParticipationRules;
    }
    
    public function addParticipant(Driver $driver)
    {
        if (false === $this->driverParticipationRules->check(
            $driver->getAge(),
            $driver->calculatePoints(),
            $driver->getCarInfo()
        )) {
            throw new ParticipationRequirementsNotMetException('Driver does not meet the requirements.');
        }
        $this->participants[] = $driver;
    }
}