<?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/middleware.php';
require_once HOPLITE_ROOT . '/http2/pipeline.php';
require_once HOPLITE_ROOT . '/http2/route_map.php';

/*!
  The Router is a middleware that operates on a RouteMap object. If a Request
  matches, the value in the RouteMap is treated as a Middleware to be built by
  Pipeline::buildMiddleware().

  If the secondary Pipeline Router::subpipe is provided, the matched value will
  be treated as if it were Pipeline::add()ed immediately before being built.
  This allows additional middleware to execute IFF a route match occurs.

  If no route mach is made, then the Router runs the next middleware.
*/
class Router extends Middleware {
  private $map;
  private $subpipe;

  public function __construct(Middleware $next,
                              RouteMap $map,
                              Pipeline $subpipe=NULL) {
    parent::__construct($next);
    $this->map = $map;
    $this->subpipe = $subpipe ? $subpipe : new Pipeline();
  }

  public function execute(Request $request) {
    // The query rewriter module of the webserver rewrites a request from:
    //    http://example.com/webapp/user/view/42
    // to:
    //    http://example.com/webapp/index.php/user/view/42
    // ... which then becomes accessible from PATH_INFO.
    if (isset($_SERVER['PATH_INFO']))
      $url = $_SERVER['PATH_INFO'];
    else
      $url = '/';
    if ($url[0] == '/')
      $url = substr($url, 1);

    $request->url = $url;
    $route_result = $this->map->match($request);

    if ($route_result) {
      $request->context[self::class] = $route_result;
      $next = $this->subpipe->buildWithTail($route_result['result']);
      return $next->execute($request);
    }

    return $this->next->execute($request);
  }
}