<?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) 2009-2012 (original work) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
 *
 *
 */

namespace oat\taoDacSimple\model;

use oat\oatbox\service\ServiceManager;

/**
 * Service to administer the privileges
 *
 * @author Joel Bout <joel@taotesting.com>
 */
class AdminService
{
    /**
     * Set a new Owner, removing the old owner(s)
     *
     * @param string $resourceUri
     * @param string $userUri
     * @return bool
     */
    public static function setOwner($resourceUri, $userUri)
    {
        /** @var DataBaseAccess $db */
        $db = self::getServiceManager()->get(DataBaseAccess::SERVICE_ID);

        // Needs better abstraction
        $dbRow = $db->getUsersWithPermissions([$resourceUri]);
        foreach ($dbRow as $row) {
            if ($row['resource_id'] == $resourceUri && $row['privilege'] == 'OWNER') {
                $db->removePermissions($row['user_id'], $resourceUri, ['OWNER']);
            }
        }

        return $db->addPermissions($userUri, $resourceUri, ['OWNER']);
    }

    /**
     * Get a list of users with permissions for a given resource
     *
     * Returns an associative array  with userid as key and an array of rights as value
     *
     * @param $resourceId
     * @return array
     */
    public static function getUsersPermissions($resourceId)
    {
        return self::getRolePrivilegeRetriever()->retrieveByResourceIds([$resourceId]);
    }

    /**
     * recursivly add permissions to a class and all instances
     * @param \core_kernel_classes_Class $class
     * @param $userUri
     * @param $rights
     */
    public static function addPermissionToClass(\core_kernel_classes_Class $class, $userUri, $rights)
    {

        /** @var DataBaseAccess $dbAccess */
        $dbAccess = self::getServiceManager()->get(DataBaseAccess::SERVICE_ID);
        $dbAccess->addPermissions($userUri, $class->getUri(), $rights);
        foreach ($class->getInstances(false) as $instance) {
            $dbAccess->addPermissions($userUri, $instance->getUri(), $rights);
        }
        foreach ($class->getSubClasses(false) as $subclass) {
            self::addPermissionToClass($subclass, $userUri, $rights);
        }
    }

    public static function getServiceManager()
    {
        return ServiceManager::getServiceManager();
    }

    private static function getRolePrivilegeRetriever(): RolePrivilegeRetriever
    {
        return self::getServiceManager()->get(RolePrivilegeRetriever::class);
    }
}