<?php
  /**
   * Copyright (c) 2013 Bart Visscher <bartv@thisnet.nl>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   *
   */
  
  namespace OC;
  use OCP\IURLGenerator;
  use RuntimeException;
  
  /**
   * Class to generate URLs
   */
  class URLGenerator implements IURLGenerator {

  
  	/**
  	 * @var \OCP\IConfig
  	 */
  	private $config;
  
  	/**
  	 * @param \OCP\IConfig $config
  	 */
  	public function __construct($config) {
  		$this->config = $config;
  	}

  	/**

  	 * Creates an url using a defined route
  	 * @param string $route

  	 * @param array $parameters

  	 * @internal param array $args with param=>value, will be appended to the returned url

  	 * @return string the url

  	 *
  	 * Returns a url to the given app and file.
  	 */
  	public function linkToRoute($route, $parameters = array()) {

  		$urlLinkTo = \OC::$server->getRouter()->generate($route, $parameters);

  		return $urlLinkTo;
  	}
  
  	/**

  	 * Creates an url

  	 * @param string $app app
  	 * @param string $file file
  	 * @param array $args array with param=>value, will be appended to the returned url
  	 *    The value of $args will be urlencoded
  	 * @return string the url
  	 *
  	 * Returns a url to the given app and file.
  	 */
  	public function linkTo( $app, $file, $args = array() ) {

  		$frontControllerActive=($this->config->getSystemValue('front_controller_active', 'false') == 'true');

  		if( $app != '' ) {
  			$app_path = \OC_App::getAppPath($app);
  			// Check if the app is in the app folder
  			if ($app_path && file_exists($app_path . '/' . $file)) {

  				if (substr($file, -3) == 'php') {

  					$urlLinkTo = \OC::$WEBROOT . '/index.php/apps/' . $app;

  					if ($frontControllerActive) {
  						$urlLinkTo = \OC::$WEBROOT . '/apps/' . $app;
  					}

  					$urlLinkTo .= ($file != 'index.php') ? '/' . $file : '';
  				} else {
  					$urlLinkTo = \OC_App::getAppWebPath($app) . '/' . $file;
  				}
  			} else {
  				$urlLinkTo = \OC::$WEBROOT . '/' . $app . '/' . $file;
  			}
  		} else {
  			if (file_exists(\OC::$SERVERROOT . '/core/' . $file)) {
  				$urlLinkTo = \OC::$WEBROOT . '/core/' . $file;
  			} else {

  				if ($frontControllerActive && $file === 'index.php') {
  					$urlLinkTo = \OC::$WEBROOT;
  				} else {
  					$urlLinkTo = \OC::$WEBROOT . '/' . $file;
  				}

  			}
  		}
  
  		if ($args && $query = http_build_query($args, '', '&')) {
  			$urlLinkTo .= '?' . $query;
  		}
  
  		return $urlLinkTo;
  	}
  
  	/**

  	 * Creates path to an image

  	 * @param string $app app
  	 * @param string $image image name

  	 * @throws \RuntimeException If the image does not exist

  	 * @return string the url
  	 *
  	 * Returns the path to the image.
  	 */
  	public function imagePath($app, $image) {
  		// Read the selected theme from the config file
  		$theme = \OC_Util::getTheme();
  
  		//if a theme has a png but not an svg always use the png
  		$basename = substr(basename($image),0,-4);
  
  		// Check if the app is in the app folder
  		if (file_exists(\OC::$SERVERROOT . "/themes/$theme/apps/$app/img/$image")) {
  			return \OC::$WEBROOT . "/themes/$theme/apps/$app/img/$image";
  		} elseif (!file_exists(\OC::$SERVERROOT . "/themes/$theme/apps/$app/img/$basename.svg")
  			&& file_exists(\OC::$SERVERROOT . "/themes/$theme/apps/$app/img/$basename.png")) {
  			return \OC::$WEBROOT . "/themes/$theme/apps/$app/img/$basename.png";
  		} elseif (file_exists(\OC_App::getAppPath($app) . "/img/$image")) {
  			return \OC_App::getAppWebPath($app) . "/img/$image";
  		} elseif (!file_exists(\OC_App::getAppPath($app) . "/img/$basename.svg")
  			&& file_exists(\OC_App::getAppPath($app) . "/img/$basename.png")) {
  			return \OC_App::getAppPath($app) . "/img/$basename.png";
  		} elseif (!empty($app) and file_exists(\OC::$SERVERROOT . "/themes/$theme/$app/img/$image")) {
  			return \OC::$WEBROOT . "/themes/$theme/$app/img/$image";
  		} elseif (!empty($app) and (!file_exists(\OC::$SERVERROOT . "/themes/$theme/$app/img/$basename.svg")
  			&& file_exists(\OC::$SERVERROOT . "/themes/$theme/$app/img/$basename.png"))) {
  			return \OC::$WEBROOT . "/themes/$theme/$app/img/$basename.png";
  		} elseif (!empty($app) and file_exists(\OC::$SERVERROOT . "/$app/img/$image")) {
  			return \OC::$WEBROOT . "/$app/img/$image";
  		} elseif (!empty($app) and (!file_exists(\OC::$SERVERROOT . "/$app/img/$basename.svg")
  			&& file_exists(\OC::$SERVERROOT . "/$app/img/$basename.png"))) {
  			return \OC::$WEBROOT . "/$app/img/$basename.png";
  		} elseif (file_exists(\OC::$SERVERROOT . "/themes/$theme/core/img/$image")) {
  			return \OC::$WEBROOT . "/themes/$theme/core/img/$image";
  		} elseif (!file_exists(\OC::$SERVERROOT . "/themes/$theme/core/img/$basename.svg")
  			&& file_exists(\OC::$SERVERROOT . "/themes/$theme/core/img/$basename.png")) {
  			return \OC::$WEBROOT . "/themes/$theme/core/img/$basename.png";
  		} elseif (file_exists(\OC::$SERVERROOT . "/core/img/$image")) {
  			return \OC::$WEBROOT . "/core/img/$image";
  		} else {
  			throw new RuntimeException('image not found: image:' . $image . ' webroot:' . \OC::$WEBROOT . ' serverroot:' . \OC::$SERVERROOT);
  		}
  	}
  
  
  	/**
  	 * Makes an URL absolute
  	 * @param string $url the url in the owncloud host
  	 * @return string the absolute version of the url
  	 */
  	public function getAbsoluteURL($url) {

  		$separator = $url[0] === '/' ? '' : '/';

  
  		// The ownCloud web root can already be prepended.
  		$webRoot = substr($url, 0, strlen(\OC::$WEBROOT)) === \OC::$WEBROOT
  			? ''
  			: \OC::$WEBROOT;
  
  		return \OC_Request::serverProtocol() . '://' . \OC_Request::serverHost(). $webRoot . $separator . $url;

  	}
  }