<?php
/**
 * ownCloud
 *
 * @author Frank Karlitschek
 * @author Jakob Sack
 * @copyright 2012 Frank Karlitschek frank@owncloud.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/**
 * @brief make OC_Helper::linkTo available as a simple function
 * @param $app app
 * @param $file file
 * @returns link to the file
 *
 * For further information have a look at OC_Helper::linkTo
 */
function link_to( $app, $file ){
	return OC_Helper::linkTo( $app, $file );
}

/**
 * @brief make OC_Helper::imagePath available as a simple function
 * @param $app app
 * @param $image image
 * @returns link to the image
 *
 * For further information have a look at OC_Helper::imagePath
 */
function image_path( $app, $image ){
	return OC_Helper::imagePath( $app, $image );
}

/**
 * @brief make OC_Helper::mimetypeIcon available as a simple function
 * @param $mimetype mimetype
 * @returns link to the image
 *
 * For further information have a look at OC_Helper::mimetypeIcon
 */
function mimetype_icon( $mimetype ){
	return OC_Helper::mimetypeIcon( $mimetype );
}

/**
 * @brief make OC_Helper::humanFileSize available as a simple function
 * @param $bytes size in bytes
 * @returns size as string
 *
 * For further information have a look at OC_Helper::humanFileSize
 */
function human_file_size( $bytes ){
	return OC_Helper::humanFileSize( $bytes );
}

function simple_file_size($bytes) {
	$mbytes = round($bytes/(1024*1024),1);
	if($bytes == 0) { return '0'; }
	else if($mbytes < 0.1) { return '&lt; 0.1'; }
	else if($mbytes > 1000) { return '&gt; 1000'; }
	else { return number_format($mbytes, 1); }
}

function relative_modified_date($timestamp) {
    $l=OC_L10N::get('template');
	$timediff = time() - $timestamp;
	$diffminutes = round($timediff/60);
	$diffhours = round($diffminutes/60);
	$diffdays = round($diffhours/24);
	$diffmonths = round($diffdays/31);
	$diffyears = round($diffdays/365);

	if($timediff < 60) { return $l->t('seconds ago'); }
	else if($timediff < 120) { return $l->t('1 minute ago'); }
	else if($timediff < 3600) { return $l->t('%d minutes ago',$diffminutes); }
	//else if($timediff < 7200) { return '1 hour ago'; }
	//else if($timediff < 86400) { return $diffhours.' hours ago'; }
	else if((date('G')-$diffhours) > 0) { return $l->t('today'); }
	else if((date('G')-$diffhours) > -24) { return $l->t('yesterday'); }
	else if($timediff < 2678400) { return $l->t('%d days ago',$diffdays); }
	else if($timediff < 5184000) { return $l->t('last month'); }
	else if((date('n')-$diffmonths) > 0) { return $l->t('months ago'); }
	else if($timediff < 63113852) { return $l->t('last year'); }
	else { return $l->t('years ago'); }
}

function html_select_options($options, $selected, $params=array()) {
	if (!is_array($selected)){
		$selected=array($selected);
	}
	if (isset($params['combine']) && $params['combine']){
		$options = array_combine($options, $options);
	}
	$value_name = $label_name = false;
	if (isset($params['value'])){
		$value_name = $params['value'];
	}
	if (isset($params['label'])){
		$label_name = $params['label'];
	}
	$html = '';
	foreach($options as $value => $label){
		if ($value_name && is_array($label)){
			$value = $label[$value_name];
		}
		if ($label_name && is_array($label)){
			$label = $label[$label_name];
		}
		$select = in_array($value, $selected) ? ' selected="selected"' : '';
		$html .= '<option value="' . $value . '"' . $select . '>' . $label . '</option>'."\n";
	}
	return $html;
}

/**
 * This class provides the templates for owncloud.
 */
class OC_Template{
	private $renderas; // Create a full page?
	private $application; // template Application
	private $vars; // Vars
	private $template; // The path to the template
	private $l10n; // The l10n-Object
	private $headers=array(); //custom headers

	/**
	 * @brief Constructor
	 * @param $app app providing the template
	 * @param $file name of the template file (without suffix)
	 * @param $renderas = ""; produce a full page
	 * @returns OC_Template object
	 *
	 * This function creates an OC_Template object.
	 *
	 * If $renderas is set, OC_Template will try to produce a full page in the
	 * according layout. For now, renderas can be set to "guest", "user" or
	 * "admin".
	 */
	public function __construct( $app, $name, $renderas = "" ){
		// Set the private data
		$this->renderas = $renderas;
		$this->application = $app;
		$this->vars = array();
		$this->l10n = OC_L10N::get($app);
                header('X-Frame-Options: Sameorigin');
                header('X-XSS-Protection: 1; mode=block');
                header('X-Content-Type-Options: nosniff');
 
		$this->findTemplate($name);
	}

	/**
	 * @brief Returns the formfactor extension for current formfactor
	 */
	static public function getFormFactorExtension()
	{
		$formfactor=$_SESSION['formfactor'];
		if($formfactor=='default') { 
			$fext='';
		}elseif($formfactor=='mobile') { 
			$fext='.mobile';
		}elseif($formfactor=='tablet') { 
			$fext='.tablet';
		}elseif($formfactor=='standalone') { 
			$fext='.standalone';
		}else{
			$fext='';
		}
		return $fext;
	}

	/**
	 * @brief find the template with the given name
	 * @param $name of the template file (without suffix)
	 *
	 * Will select the template file for the selected theme and formfactor.
	 * Checking all the possible locations.
	 */
	protected function findTemplate($name)
	{
		// Read the selected theme from the config file
		$theme=OC_Config::getValue( "theme" );

		// Read the detected formfactor and use the right file name.
		$fext = self::getFormFactorExtension();

		$app = $this->application;
		// Check if it is a app template or not.
		if( $app != "" ){
			// Check if the app is in the app folder or in the root
			if( file_exists( OC::$APPSROOT."/apps/$app/templates/" )){
				// Check if the template is overwritten by the selected theme
				if ($this->checkPathForTemplate(OC::$SERVERROOT."/themes/$theme/apps/$app/templates/", $name, $fext)) {
				}elseif ($this->checkPathForTemplate(OC::$APPSROOT."/apps/$app/templates/", $name, $fext)) {
				}
			}else{
				// Check if the template is overwritten by the selected theme
				if ($this->checkPathForTemplate(OC::$SERVERROOT."/themes/$theme/$app/templates/", $name, $fext)) {
				}elseif ($this->checkPathForTemplate(OC::$SERVERROOT."/$app/templates/", $name, $fext)) {
				}else{
					echo('template not found: template:'.$name.' formfactor:'.$fext.' webroot:'.OC::$WEBROOT.' serverroot:'.OC::$SERVERROOT);
					die();
				}

			}
		}else{
			// Check if the template is overwritten by the selected theme
			if ($this->checkPathForTemplate(OC::$SERVERROOT."/themes/$theme/core/templates/", $name, $fext)) {
			} elseif ($this->checkPathForTemplate(OC::$SERVERROOT."/core/templates/", $name, $fext)) {
			}else{
				echo('template not found: template:'.$name.' formfactor:'.$fext.' webroot:'.OC::$WEBROOT.' serverroot:'.OC::$SERVERROOT);
				die();
			}
		}
	}

	/**
	 * @brief check Path For Template with and without $fext
	 * @param $path to check
	 * @param $name of the template file (without suffix)
	 * @param $fext formfactor extension
	 * @return bool true when found
	 *
	 * Will set $this->template and $this->path if there is a template at
	 * the specifief $path
	 */
	protected function checkPathForTemplate($path, $name, $fext)
	{
		if ($name =='') return false;
		$template = null;
		if( is_file( $path.$name.$fext.'.php' )){
			$template = $path.$name.$fext.'.php';
		}elseif( is_file( $path.$name.'.php' )){
			$template = $path.$name.'.php';
		}
		if ($template) {
			$this->template = $template;
			$this->path = $path;
			return true;
		}
		return false;
	}

	/**
	 * @brief Assign variables
	 * @param $key key
	 * @param $value value
	 * @param $sanitizeHTML false, if data shouldn't get passed through htmlentities
	 * @returns true
	 *
	 * This function assigns a variable. It can be accessed via $_[$key] in
	 * the template.
	 *
	 * If the key existed before, it will be overwritten
	 */
		public function assign( $key, $value, $sanitizeHTML=true ){
		if($sanitizeHTML == true) {
			if(is_array($value)) {
				array_walk_recursive($value,'OC_Template::sanitizeHTML');
			} else {
				$value = OC_Template::sanitizeHTML($value);
			}
		}
		$this->vars[$key] = $value;
		return true;
	}


	/**
	 * @brief Internaly used to sanitze HTML
	 *
	 * This function is internally used to sanitize HTML.
	 */
 	private static function sanitizeHTML( &$value ){
 		if(is_string($value)) {
        $value = htmlentities( $value, ENT_QUOTES );
        return $value;
        }
    }

	/**
	 * @brief Appends a variable
	 * @param $key key
	 * @param $value value
	 * @returns true
	 *
	 * This function assigns a variable in an array context. If the key already
	 * exists, the value will be appended. It can be accessed via
	 * $_[$key][$position] in the template.
	 */
	public function append( $key, $value ){
		if( array_key_exists( $key, $this->vars )){
			$this->vars[$key][] = $value;
		}
		else{
			$this->vars[$key] = array( $value );
		}
	}

	/**
	 * @brief Add a custom element to the header
	 * @param string tag tag name of the element
	 * @param array $attributes array of attrobutes for the element
	 * @param string $text the text content for the element
	 */
	public function addHeader( $tag, $attributes, $text=''){
		$this->headers[]=array('tag'=>$tag,'attributes'=>$attributes,'text'=>$text);
	}

	/**
	 * @brief Prints the proceeded template
	 * @returns true/false
	 *
	 * This function proceeds the template and prints its output.
	 */
	public function printPage(){
		$data = $this->fetchPage();
		if( $data === false ){
			return false;
		}
		else{
			print $data;
			return true;
		}
	}

	/*
	 * @brief append the $file-url if exist at $root
	 * @param $type of collection to use when appending
	 * @param $root path to check
	 * @param $web base for path
	 * @param $file the filename
	 */
        public function appendIfExist($type, $root, $web, $file) {
                if (is_file($root.'/'.$file)) {
                		$pathes = explode('/', $file);
                		if($type == 'cssfiles' && $root == OC::$APPSROOT && $pathes[0] == 'apps'){
                				$app = $pathes[1];
                				unset($pathes[0]);
                				unset($pathes[1]);
                				$path = implode('/', $pathes);
                				$this->append( $type, OC_Helper::linkTo($app, $path));
                		}else{
                				$this->append( $type, $web.'/'.$file);
                		}
                        return true;
                }
                return false;
        }
	/**
	 * @brief Proceeds the template
	 * @returns content
	 *
	 * This function proceeds the template. If $this->renderas is set, it
	 * will produce a full page.
	 */
	public function fetchPage(){
		$data = $this->_fetch();

		if( $this->renderas ){
			// Decide which page we show
			if( $this->renderas == "user" ){
				$page = new OC_Template( "core", "layout.user" );
				$page->assign('searchurl',OC_Helper::linkTo( 'search', 'index.php' ), false);
				if(array_search(OC_APP::getCurrentApp(),array('settings','admin','help'))!==false){
					$page->assign('bodyid','body-settings', false);
				}else{
					$page->assign('bodyid','body-user', false);
				}

				// Add navigation entry
				$navigation = OC_App::getNavigation();
				$page->assign( "navigation", $navigation, false);
				$page->assign( "settingsnavigation", OC_App::getSettingsNavigation(), false);
				foreach($navigation as $entry) {
					if ($entry['active']) {
						$page->assign( 'application', $entry['name'], false );
						break;
					}
				}
			}else{
				$page = new OC_Template( "core", "layout.guest" );
			}

			// Read the selected theme from the config file
			$theme=OC_Config::getValue( "theme" );

			// Read the detected formfactor and use the right file name.
			$fext = self::getFormFactorExtension();

			$page->assign('jsfiles', array(), false);
			// Add the core js files or the js files provided by the selected theme
			foreach(OC_Util::$scripts as $script){
				// Is it in 3rd party?
                                if($page->appendIfExist('jsfiles', OC::$THIRDPARTYROOT, OC::$THIRDPARTYWEBROOT, $script.'.js')) {

				// Is it in apps and overwritten by the theme?
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/apps/$script$fext.js" )) {
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/apps/$script.js" )) {

				// Is it part of an app?
				}elseif($page->appendIfExist('jsfiles', OC::$APPSROOT, OC::$APPSWEBROOT, "apps/$script$fext.js" )) {
				}elseif($page->appendIfExist('jsfiles', OC::$APPSROOT, OC::$APPSWEBROOT, "apps/$script.js" )) {

				// Is it in the owncloud root but overwritten by the theme?
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/$script$fext.js" )) {
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/$script.js" )) {

				// Is it in the owncloud root ?
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "$script$fext.js" )) {
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "$script.js" )) {

				// Is in core but overwritten by a theme?
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/core/$script$fext.js" )) {
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/core/$script.js" )) {

				// Is it in core?
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "core/$script$fext.js" )) {
				}elseif($page->appendIfExist('jsfiles', OC::$SERVERROOT, OC::$WEBROOT, "core/$script.js" )) {

				}else{
					echo('js file not found: script:'.$script.' formfactor:'.$fext.' webroot:'.OC::$WEBROOT.' serverroot:'.OC::$SERVERROOT);
					die();

				}
			}
			// Add the css files
			$page->assign('cssfiles', array());
			foreach(OC_Util::$styles as $style){
				// is it in 3rdparty?
                                if($page->appendIfExist('cssfiles', OC::$THIRDPARTYROOT, OC::$THIRDPARTYWEBROOT, $style.'.css')) {

				// or in apps?
				}elseif($page->appendIfExist('cssfiles', OC::$APPSROOT, OC::$APPSWEBROOT, "apps/$style$fext.css" )) {
				}elseif($page->appendIfExist('cssfiles', OC::$APPSROOT, OC::$APPSWEBROOT, "apps/$style.css" )) {

				// or in the owncloud root?
				}elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "$style$fext.css" )) {
				}elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "$style.css" )) {

				// or in core ?
				}elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "core/$style$fext.css" )) {
				}elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "core/$style.css" )) {

				}else{
					echo('css file not found: style:'.$style.' formfactor:'.$fext.' webroot:'.OC::$WEBROOT.' serverroot:'.OC::$SERVERROOT);
					die();
				}
			}
			// Add the theme css files. you can override the default values here
			if(!empty($theme)) {
				foreach(OC_Util::$styles as $style){
                                             if($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/apps/$style$fext.css" )) {
                                        }elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/apps/$style.css" )) {

                                        }elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/$style$fext.css" )) {
                                        }elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/$style.css" )) {

                                        }elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/core/$style$fext.css" )) {
                                        }elseif($page->appendIfExist('cssfiles', OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/core/$style.css" )) {
                                        }
				}
			}

			// Add custom headers
			$page->assign('headers',$this->headers, false);
			foreach(OC_Util::$headers as $header){
				$page->append('headers',$header);
			}

			// Add css files and js files
			$page->assign( "content", $data, false );
			return $page->fetchPage();
		}
		else{
			return $data;
		}
	}

	/**
	 * @brief doing the actual work
	 * @returns content
	 *
	 * Includes the template file, fetches its output
	 */
	private function _fetch(){
		// Register the variables
		$_ = $this->vars;
		$l = $this->l10n;

		// Execute the template
		ob_start();
		include( $this->template ); // <-- we have to use include because we pass $_!
		$data = ob_get_contents();
		@ob_end_clean();

		// return the data
		return $data;
	}

	/**
	 * @brief Include template
	 * @returns returns content of included template
	 *
	 * Includes another template. use <?php echo $this->inc('template'); ?> to
	 * do this.
	 */
	public function inc( $file, $additionalparams = null ){
		// $_ erstellen
		$_ = $this->vars;
		$l = $this->l10n;

		if( !is_null($additionalparams)){
			$_ = array_merge( $additionalparams, $this->vars );
		}

		// Einbinden
		ob_start();
		include( $this->path.$file.'.php' );
		$data = ob_get_contents();
		@ob_end_clean();

		// Daten zurückgeben
		return $data;
	}

	/**
	 * @brief Shortcut to print a simple page for users
	 * @param $application The application we render the template for
	 * @param $name Name of the template
	 * @param $parameters Parameters for the template
	 * @returns true/false
	 */
	public static function printUserPage( $application, $name, $parameters = array() ){
		$content = new OC_Template( $application, $name, "user" );
		foreach( $parameters as $key => $value ){
			$content->assign( $key, $value );
		}
		print $content->printPage();
	}

	/**
	 * @brief Shortcut to print a simple page for admins
	 * @param $application The application we render the template for
	 * @param $name Name of the template
	 * @param $parameters Parameters for the template
	 * @returns true/false
	 */
	public static function printAdminPage( $application, $name, $parameters = array() ){
		$content = new OC_Template( $application, $name, "admin" );
		foreach( $parameters as $key => $value ){
			$content->assign( $key, $value );
		}
		return $content->printPage();
	}

	/**
	 * @brief Shortcut to print a simple page for guests
	 * @param $application The application we render the template for
	 * @param $name Name of the template
	 * @param $parameters Parameters for the template
	 * @returns true/false
	 */
	public static function printGuestPage( $application, $name, $parameters = array() ){
		$content = new OC_Template( $application, $name, "guest" );
		foreach( $parameters as $key => $value ){
			$content->assign( $key, $value );
		}
		return $content->printPage();
	}
}