<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license.
 */

namespace ProxyManager\Signature;

use ProxyManager\Signature\Exception\InvalidSignatureException;
use ProxyManager\Signature\Exception\MissingSignatureException;
use ReflectionClass;

/**
 * Generator for signatures to be used to check the validity of generated code
 *
 * @author Marco Pivetta <ocramius@gmail.com>
 * @license MIT
 */
final class SignatureChecker implements SignatureCheckerInterface
{
    /**
     * @var SignatureGeneratorInterface
     */
    private $signatureGenerator;

    /**
     * @param SignatureGeneratorInterface $signatureGenerator
     */
    public function __construct(SignatureGeneratorInterface $signatureGenerator)
    {
        $this->signatureGenerator = $signatureGenerator;
    }

    /**
     * {@inheritDoc}
     */
    public function checkSignature(ReflectionClass $class, array $parameters)
    {
        $propertyName      = 'signature' . $this->signatureGenerator->generateSignatureKey($parameters);
        $signature         = $this->signatureGenerator->generateSignature($parameters);
        $defaultProperties = $class->getDefaultProperties();

        if (! isset($defaultProperties[$propertyName])) {
            throw MissingSignatureException::fromMissingSignature($class, $parameters, $signature);
        }

        if ($defaultProperties[$propertyName] !== $signature) {
            throw InvalidSignatureException::fromInvalidSignature(
                $class,
                $parameters,
                $defaultProperties[$propertyName],
                $signature
            );
        }
    }
}
