<?php
  
  /**
   * ownCloud - Template Editor
   *
   * @author Jörn Dreyer
   * @copyright 2014 Jörn Dreyer <jfd@owncloud.com>
   *
   * 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/>.
   *
   */
  
  namespace OCA\TemplateEditor;
  
  use OCP\Files\NotPermittedException;
  use OC\AppFramework\Middleware\Security\SecurityException;
  use OCA\TemplateEditor\Http\MailTemplateResponse;
  
  class MailTemplate extends \OC_Template {
  
  	private $path;
  	private $theme;
  	private $editableThemes;
  	private $editableTemplates;
  
  	public function __construct($theme, $path) {
  		$this->theme = $theme;
  		$this->path = $path;
  
  		//determine valid theme names
  		$this->editableThemes = self::getEditableThemes();
  		//for now hard code the valid mail template paths
  		$this->editableTemplates = self::getEditableTemplates();
  	}
  	
  	/**
  	 * @return \OCA\TemplateEditor\Http\MailTemplateResponse
  	 * @throws \OC\AppFramework\Middleware\Security\SecurityException
  	 */
  	public function getResponse() {
  		if($this->isEditable()) {
  			list($app, $filename) = explode('/templates/', $this->path, 2);
  			$name = substr($filename, 0, -4);
  			list(, $template) = $this->findTemplate($this->theme, $app, $name, '');
  			return new MailTemplateResponse($template);
  		}
  		throw new SecurityException('Template not editable.', 403);
  	}
  
  	public function renderContent() {
  		if($this->isEditable()) {
  			list($app, $filename) = explode('/templates/', $this->path, 2);
  			$name = substr($filename, 0, -4);
  			list(, $template) = $this->findTemplate($this->theme, $app, $name, '');
  			\OC_Response::sendFile($template);
  		} else {
  			throw new SecurityException('Template not editable.', 403);
  		}
  	}
  
  	public function isEditable() {
  		if (isset($this->editableThemes[$this->theme])
  			&& isset($this->editableTemplates[$this->path])
  		) {
  			return true;
  		}
  		return false;
  	}
  
  	public function setContent($data) {
  		if($this->isEditable()) {
  			//save default templates in default folder to overwrite core template
  			$absolutePath = \OC::$SERVERROOT.'/themes/'.$this->theme.'/'.$this->path;
  			$parent = dirname($absolutePath);
  			if ( ! is_dir($parent) ) {
  				if ( ! mkdir(dirname($absolutePath), 0777, true) ){
  					throw new \Exception('Could not create directory.', 500);
  				}
  			}
  			if ( $this->theme !== 'default' && is_file($absolutePath) ) {
  				if ( ! copy($absolutePath, $absolutePath.'.bak') ){
  					throw new \Exception('Could not overwrite template.', 500);
  				}
  			}
  			//overwrite theme templates? use versions?
  			return file_put_contents($absolutePath, $data);
  		}
  		throw new SecurityException('Template not editable.', 403);
  	}
  
  	public function reset(){
  		if($this->isEditable()) {
  			$absolutePath = \OC::$SERVERROOT.'/themes/'.$this->theme.'/'.$this->path;
  			if ($this->theme === 'default') {
  				//templates can simply be deleted in the themes folder
  				if (unlink($absolutePath)) {
  					return true;
  				}
  			} else {
  				//if a bak file exists overwrite the template with it
  				if (is_file($absolutePath.'.bak')) {
  					if (rename($absolutePath.'.bak', $absolutePath)) {
  						return true;
  					}
  				}
  			}
  			return false;
  		}
  		throw new NotPermittedException('Template not editable.', 403);
  	}
  
  	/**
  	 * @return array with available themes. consists of core and subfolders in the themes folder
  	 */
  	public static function getEditableThemes() {
  		$themes = array(
  			'default' => true
  		);
  		if ($handle = opendir(\OC::$SERVERROOT.'/themes')) {
  			while (false !== ($entry = readdir($handle))) {
  				if ($entry != '.' && $entry != '..' && $entry != 'default') {
  					if (is_dir(\OC::$SERVERROOT.'/themes/'.$entry)) {
  						$themes[$entry] = true;
  					}
  				}
  			}
  			closedir($handle);
  		}
  		return $themes;
  	}
  
  	/**
  	 * @return array with keys containing the path and values containing the name of a template
  	 */
  	public static function getEditableTemplates() {
  		$l10n = \OC_L10N::get('templateeditor');
  		$templates = array(
  			'core/templates/mail.php' => $l10n->t('Sharing email (http)'),
  			'core/templates/altmail.php' => $l10n->t('Sharing email'),
  			'core/lostpassword/templates/email.php' => $l10n->t('Lost password mail'),
  		);
  
  		if (\OCP\App::isEnabled('activity')) {
  			$tmplPath = \OC_App::getAppPath('activity') . '/templates/email.notification.php';
  			$path = substr($tmplPath, strlen(\OC::$SERVERROOT) + 1);
  			$templates[$path] = $l10n->t('Activity notification mail');
  		}
  
  		return $templates;
  	}
  }