<?php

namespace Minormous\Dispatch;

use Psr\Http\Message\ResponseInterface;

use Psr\Http\Message\ServerRequestInterface;

use Psr\Http\Server\RequestHandlerInterface;

class Handler implements RequestHandlerInterface

{

/**

* @var array

*/

private $middleware;

/**

* @var callable

*/

private $default;

/**

* @var integer

*/

private $index = 0;

/**

* @param array $middleware

* @param callable $default

*/

public function __construct(array $middleware, callable $default)

{

$this->middleware = $middleware;

$this->default = $default;

}

public function handle(ServerRequestInterface $request): ResponseInterface

{

if (empty($this->middleware[$this->index])) {

return call_user_func($this->default, $request);

}

return $this->middleware[$this->index]->process($request, $this->nextHandler());

}

/**

* Get a handler pointing to the next middleware.

*

* @return static

*/

private function nextHandler()

{

$copy = clone $this;

$copy->index++;

return $copy;

}

}