<?php
// Hoplite
// Copyright (c) 2016 Blue Static
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program.  If not, see <http://www.gnu.org/licenses/>.

namespace hoplite\http2;

require_once HOPLITE_ROOT . '/http2/pipeline.php';
require_once HOPLITE_ROOT . '/http2/request.php';
require_once HOPLITE_ROOT . '/http2/response.php';

abstract class Middleware {
  protected $next;

  public function __construct(Middleware $next) {
    $this->next = $next;
  }

  public abstract /*http\Response*/ function execute(Request $request);
}

class Sentinel extends Middleware {
  private $response;

  public function __construct(Response $response) {
    $this->response = $response;
  }

  public function execute(Request $request) {
    return $this->response;
  }
}

class ClosureMiddleware extends Middleware {
  private $closure;

  public function __construct(Middleware $next,
                              \Closure $closure) {
    parent::__construct($next);
    $this->closure = $closure;
  }

  public function execute(Request $request) {
    $closure = $this->closure;
    return $closure($request, $this->next);
  }
}