<?php

declare(strict_types=1);

namespace ProxyManager\Factory;

use ProxyManager\Proxy\NullObjectInterface;
use ProxyManager\ProxyGenerator\NullObjectGenerator;
use ProxyManager\ProxyGenerator\ProxyGeneratorInterface;
use ProxyManager\Signature\Exception\InvalidSignatureException;
use ProxyManager\Signature\Exception\MissingSignatureException;

/**
 * Factory responsible of producing proxy objects
 *
 * @author Vincent Blanchon <blanchon.vincent@gmail.com>
 * @license MIT
 */
class NullObjectFactory extends AbstractBaseFactory
{
    /**
     * @var \ProxyManager\ProxyGenerator\NullObjectGenerator|null
     */
    private $generator;

    /**
     * @param object|string $instanceOrClassName the object to be wrapped or interface to transform to null object
     *
     * @throws InvalidSignatureException
     * @throws MissingSignatureException
     * @throws \OutOfBoundsException
     */
    public function createProxy($instanceOrClassName) : NullObjectInterface
    {
        $className      = is_object($instanceOrClassName) ? get_class($instanceOrClassName) : $instanceOrClassName;
        $proxyClassName = $this->generateProxy($className);

        return $proxyClassName::staticProxyConstructor();
    }

    /**
     * {@inheritDoc}
     */
    protected function getGenerator() : ProxyGeneratorInterface
    {
        return $this->generator ?: $this->generator = new NullObjectGenerator();
    }
}