<?php

declare(strict_types=1);

namespace App\Game;

final class EntityList extends \ArrayObject
{
    public function remove(GameObject $gameObject): void
    {
        foreach (array_keys($this->getArrayCopy()) as $key) {
            if ($this[$key] === $gameObject) {
                $this->offsetUnset($key);
                break;
            }
        }
    }

    public function findByKind(string $kind): array
    {
        $found = [];
        foreach ($this as $entity) {
            if ($entity->kind() === $kind) {
                $found[] = $entity;
            }
        }

        return $found;
    }

    /** Snapshot copy so entities added mid-iteration are not touched. */
    public function copy(): array
    {
        $copy = [];
        foreach ($this as $entity) {
            $copy[] = $entity;
        }

        return $copy;
    }
}