<?php



/**

 * This file is part of the Nette Framework (http://nette.org)

 *

 * Copyright (c) 2004, 2011 David Grudl (http://davidgrudl.com)

 *

 * For the full copyright and license information, please view

 * the file license.txt that was distributed with this source code.

 */



namespace Nette\Application\Routers;



use Nette,

	Nette\Application;







/**

 * The bidirectional route for trivial routing via query parameters.

 *

 * @author     David Grudl

 */

class SimpleRouter extends Nette\Object implements Application\IRouter

{

	const PRESENTER_KEY = 'presenter';

	const MODULE_KEY = 'module';



	/** @var string */

	private $module = '';



	/** @var array */

	private $defaults;



	/** @var int */

	private $flags;







	/**

	 * @param  array   default values

	 * @param  int     flags

	 */

	public function __construct($defaults = array(), $flags = 0)

	{

		if (is_string($defaults)) {

			$a = strrpos($defaults, ':');

			if (!$a) {

				throw new Nette\InvalidArgumentException("Argument must be array or string in format Presenter:action, '$defaults' given.");

			}

			$defaults = array(

				self::PRESENTER_KEY => substr($defaults, 0, $a),

				'action' => $a === strlen($defaults) - 1 ? Application\UI\Presenter::DEFAULT_ACTION : substr($defaults, $a + 1),

			);

		}



		if (isset($defaults[self::MODULE_KEY])) {

			$this->module = $defaults[self::MODULE_KEY] . ':';

			unset($defaults[self::MODULE_KEY]);

		}



		$this->defaults = $defaults;

		$this->flags = $flags;

	}







	/**

	 * Maps HTTP request to a Request object.

	 * @param  Nette\Http\IRequest

	 * @return Nette\Application\Request|NULL

	 */

	public function match(Nette\Http\IRequest $httpRequest)

	{

		if ($httpRequest->getUrl()->getPathInfo() !== '') {

			return NULL;

		}

		// combine with precedence: get, (post,) defaults

		$params = $httpRequest->getQuery();

		$params += $this->defaults;



		if (!isset($params[self::PRESENTER_KEY])) {

			throw new Nette\InvalidStateException('Missing presenter.');

		}



		$presenter = $this->module . $params[self::PRESENTER_KEY];

		unset($params[self::PRESENTER_KEY]);



		return new Application\Request(

			$presenter,

			$httpRequest->getMethod(),

			$params,

			$httpRequest->getPost(),

			$httpRequest->getFiles(),

			array(Application\Request::SECURED => $httpRequest->isSecured())

		);

	}







	/**

	 * Constructs absolute URL from Request object.

	 * @param  Nette\Application\Request

	 * @param  Nette\Http\Url

	 * @return string|NULL

	 */

	public function constructUrl(Application\Request $appRequest, Nette\Http\Url $refUrl)

	{

		$params = $appRequest->getParams();



		// presenter name

		$presenter = $appRequest->getPresenterName();

		if (strncasecmp($presenter, $this->module, strlen($this->module)) === 0) {

			$params[self::PRESENTER_KEY] = substr($presenter, strlen($this->module));

		} else {

			return NULL;

		}



		// remove default values; NULL values are retain

		foreach ($this->defaults as $key => $value) {

			if (isset($params[$key]) && $params[$key] == $value) { // intentionally ==

				unset($params[$key]);

			}

		}



		$url = ($this->flags & self::SECURED ? 'https://' : 'http://') . $refUrl->getAuthority() . $refUrl->getPath();

		$sep = ini_get('arg_separator.input');

		$query = http_build_query($params, '', $sep ? $sep[0] : '&');

		if ($query != '') { // intentionally ==

			$url .= '?' . $query;

		}

		return $url;

	}







	/**

	 * Returns default values.

	 * @return array

	 */

	public function getDefaults()

	{

		return $this->defaults;

	}



}