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  • How to Implement a Logic in PHP for Fight App?

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    Answer it

    Please take a look at the code below. We've got a class FightService, which implements a logic of a fight between two heroes. After the fight one of the hero may lose some health points.

     

    Please implement a test for FightService::fight() method.

     

    Feel free to refactor any code if you think it's needed.

     

    <?php
    use PHPUnit\Framework\TestCase;

    interface HeroInterface
    {
        public function getAttack(): int;

        public function getDefence(): int;

        public function getHealthPoints(): int;

        public function setHealthPoints(int $healthPoints);
    }

    class DamageCalculator
    {
        const DAMAGE_RAND_FACTOR = 0.2;

        public static function calculateDamage(HeroInterface $attacker, HeroInterface $defender): int
        {
            $damage = 0;

            if ($attacker->getAttack() > $defender->getDefence()) {
                $baseDamage = $attacker->getAttack() - $defender->getDefence();

                $factor = $baseDamage * self::DAMAGE_RAND_FACTOR;

                $minDamage = $baseDamage - $factor;
                $maxDamage = $baseDamage + $factor;

                $damage = mt_rand($minDamage, $maxDamage);
            }

            return $damage;
        }
    }

    class FightService
    {
        public function fight(HeroInterface $attacker, HeroInterface $defender)
        {
            $damage = DamageCalculator::calculateDamage($attacker, $defender);

            $defender->setHealthPoints($defender->getHealthPoints() - $damage);
        }
    }

    class FightServiceTest extends TestCase {

        public function testFight()
        {
            // implement the test
        }
    }
     

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