<?php



/*

 * This file is part of the Prophecy.

 * (c) Konstantin Kudryashov <ever.zet@gmail.com>

 *     Marcello Duarte <marcello.duarte@gmail.com>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */



namespace Prophecy\Promise;



use Doctrine\Instantiator\Instantiator;

use Prophecy\Prophecy\ObjectProphecy;

use Prophecy\Prophecy\MethodProphecy;

use Prophecy\Exception\InvalidArgumentException;

use ReflectionClass;



/**

 * Throw promise.

 *

 * @author Konstantin Kudryashov <ever.zet@gmail.com>

 */

class ThrowPromise implements PromiseInterface

{

    private $exception;



    /**

     * @var \Doctrine\Instantiator\Instantiator

     */

    private $instantiator;



    /**

     * Initializes promise.

     *

     * @param string|\Exception|\Throwable $exception Exception class name or instance

     *

     * @throws \Prophecy\Exception\InvalidArgumentException

     */

    public function __construct($exception)

    {

        if (is_string($exception)) {

            if ((!class_exists($exception) && !interface_exists($exception)) || !$this->isAValidThrowable($exception)) {

                throw new InvalidArgumentException(sprintf(

                    'Exception / Throwable class or instance expected as argument to ThrowPromise, but got %s.',

                    $exception

                ));

            }

        } elseif (!$exception instanceof \Exception && !$exception instanceof \Throwable) {

            throw new InvalidArgumentException(sprintf(

                'Exception / Throwable class or instance expected as argument to ThrowPromise, but got %s.',

                is_object($exception) ? get_class($exception) : gettype($exception)

            ));

        }



        $this->exception = $exception;

    }



    /**

     * Throws predefined exception.

     *

     * @param array          $args

     * @param ObjectProphecy $object

     * @param MethodProphecy $method

     *

     * @throws object

     */

    public function execute(array $args, ObjectProphecy $object, MethodProphecy $method)

    {

        if (is_string($this->exception)) {

            $classname   = $this->exception;

            $reflection  = new ReflectionClass($classname);

            $constructor = $reflection->getConstructor();



            if ($constructor->isPublic() && 0 == $constructor->getNumberOfRequiredParameters()) {

                throw $reflection->newInstance();

            }



            if (!$this->instantiator) {

                $this->instantiator = new Instantiator();

            }



            throw $this->instantiator->instantiate($classname);

        }



        throw $this->exception;

    }



    /**

     * @param string $exception

     *

     * @return bool

     */

    private function isAValidThrowable($exception)

    {

        return is_a($exception, 'Exception', true)

            || is_a($exception, 'Throwable', true);

    }

}

