<?php
namespace sammo\DTO\Caster;
use Spatie\DataTransferObject\Caster;

class BackedEnumCaster implements Caster
{
    private \ReflectionMethod $backedEnumFrom;
    public function __construct(
        array $type,
    ) {
        $enumType = $type[0] ?? null;
        if(!is_subclass_of($enumType, \BackedEnum::class)){
            throw new \Exception('Not BackedEnum: '.$enumType);
        }
        $reflector = new \ReflectionEnum($enumType);
        $this->backedEnumFrom = $reflector->getMethod('from');
    }

    public function cast(mixed $value): \BackedEnum
    {
        if(!is_string($value) && !is_int($value)){
            throw new \Exception('BackedEnumCaster only accepts string|int');
        }

        return $this->backedEnumFrom->invoke(null, $value);
    }
}