<?php

/**
 * 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; under version 2
 * of the License (non-upgradable).
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2002-2008 (original work) Public Research Centre Henri Tudor & University of Luxembourg (under the project TAO & TAO2);
 *               2008-2010 (update and modification) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
 *               2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
 *               2015-2018 (update and modification) Open Assessment Technologies SA;
 *
 */

namespace oat\taoBackOffice\controller;

use core_kernel_classes_Class;
use oat\taoBackOffice\model\tree\TreeService;

/**
 * This controller provide the actions to manage the lists of data
 *
 * @author CRP Henri Tudor - TAO Team - {@link http://www.tao.lu}
 * @license GPLv2  http://www.opensource.org/licenses/gpl-2.0.php
 * @package taoBackOffice
 *
 *
 */
class Trees extends \tao_actions_RdfController
{

    /**
     * @return TreeService
     */
    protected function getClassService()
    {
        return TreeService::singleton();
    }

    /**
     *
     * @return \core_kernel_classes_Class
     */
    protected function getRootClass()
    {
        return $this->getClassService()->getRootClass();
    }

    /**
     * Visualises the tree
     */
    public function getTree()
    {
        $tree = $this->getClass($this->getRequestParameter('uri'));
        $struct = $this->getClassService()->getFlatStructure(
            $tree,
            function ($label) {
                return wordwrap($label, 30, "\n");
            }
        );
        $this->returnJson($struct);
    }

    /**
     * Renders a tree
     * @requiresRight id READ
     */
    public function viewTree()
    {

        $this->setData('id', $this->getRequestParameter('id'));

        $this->setView('Trees/viewTree.tpl');
    }

    /**
     * Returns an empty view
     */
    public function dummy()
    {
    }

    /**
     * Populates the Tree of Trees
     *
     * @requiresRight classUri READ
     */
    public function getTreeData()
    {
        $data = [
            'data' => __("Trees"),
            'type' => 'class',
            'attributes' => [
                'id' => \tao_helpers_Uri::encode($this->getRootClass()->getUri()),
                'class' => 'node-class',
                'data-uri' => $this->getRootClass()->getUri()
            ],

        ];

        $sublasses = $this->getRootClass()->getSubClasses(false);

        if (count($sublasses)) {
            $data['children'] = [];
        }

        foreach ($sublasses as $class) {
            $data['children'][] = [
                'data' => $class->getLabel(),
                'type' => 'instance',
                'attributes' => [
                    'id' => \tao_helpers_Uri::encode($class->getUri()),
                    'class' => 'node-instance',
                    'data-uri' => $class->getUri()
                ]
            ];
        }

        //retrieve resources permissions
        $user = $this->getSession()->getUser();
        $permissions = $this->getResourceService()->getResourcesPermissions($user, $data);

        //expose the tree
        $this->returnJson([
            'tree' => $data,
            'permissions' => $permissions
        ]);
    }
}