<?php

declare(strict_types=1);


namespace phpDocumentor\Reflection\Types;

use InvalidArgumentException;
use phpDocumentor\Reflection\Fqsen;
use phpDocumentor\Reflection\Type;

use function strpos;

final class Object_ implements Type
{

    private $fqsen;

    public function __construct(?Fqsen $fqsen = null)
    {
        if (strpos((string) $fqsen, '::') !== false || strpos((string) $fqsen, '()') !== false) {
            throw new InvalidArgumentException(
                'Object types can only refer to a class, interface or trait but a method, function, constant or '
                . 'property was received: ' . (string) $fqsen
            );
        }

        $this->fqsen = $fqsen;
    }

    public function getFqsen(): ?Fqsen
    {
        return $this->fqsen;
    }

    public function __toString(): string
    {
        if ($this->fqsen) {
            return (string) $this->fqsen;
        }

        return 'object';
    }
}
