<?php
class Stack
{
    /**
     * Method to call on the decoracted class.
     *
     * @var string
     */


    protected $method;


    /**
     * Container.
     */


    protected $container;


    /**
     * Middleware layers.
     *
     * @var array
     */


    protected $layers = [];


    public function __construct(Container $container = null, $method = null)
    {
        $this->container = $container ?: new Container;
        $this->method = $method ?: 'handle';
    }


    public function addLayer($class, $inner = true)
    {
        return $inner ? array_unshift($this->layers, $class) : array_push($this->layers, $class);
    }


    public function addInnerLayer($class)
    {
        return $this->addLayer($class);
    }


    public function addOuterLayer($class)
    {
        return $this->addLayer($class, false);
    }


    protected function buildCoreClosure($object)
    {
        return function(...$arguments) use ($object)
        {
            $callable = $object instanceof Closure ? $object : [$object, $this->method];


            return $callable(...$arguments);
        };
    }


    protected function buildLayerClosure($layer, Closure $next)
    {
        return function(...$arguments) use ($layer, $next)
        {
            return $layer->execute(...array_merge($arguments, [$next]));
        };
    }




    public function peel($object, array $parameters = [])
    {
        $next = $this->buildCoreClosure($object);


        foreach($this->layers as $layer)
        {
            $layer = $this->container->get($layer);


            $next = $this->buildLayerClosure($layer, $next);
        }


        return $next(...$parameters);
    }
}