<?php

declare(strict_types=1);

/**
 * 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) 2020 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 */

namespace oat\taoDacSimple\model;

use common_exception_Error;
use core_kernel_classes_Class;
use core_kernel_classes_Resource;
use oat\generis\model\data\permission\PermissionInterface;
use oat\generis\model\data\permission\ReverseRightLookupInterface;
use oat\generis\model\GenerisRdf;
use oat\oatbox\service\ConfigurableService;
use oat\oatbox\service\exception\InvalidServiceManagerException;
use oat\oatbox\user\User;
use oat\tao\model\TaoOntology;

/**
 * Simple permissible Permission model
 *
 * does not require privileges
 * does not grant privileges
 *
 * @access public
 * @author Joel Bout, <joel@taotesting.com>
 */
class PermissionProvider extends ConfigurableService implements PermissionInterface, ReverseRightLookupInterface
{
    public const PERMISSION_GRANT = 'GRANT';
    public const PERMISSION_READ = 'READ';
    public const PERMISSION_WRITE = 'WRITE';

    /**
     * (non-PHPdoc)
     * @param User  $user
     * @param array $resourceIds
     *
     * @return array
     * @throws InvalidServiceManagerException
     * @see \oat\generis\model\data\PermissionInterface::getPermissions()
     */
    public function getPermissions(User $user, array $resourceIds)
    {
        if (in_array(DacRoles::DAC_ADMINISTRATOR, $user->getRoles(), true)) {
            $permissions = [];
            foreach ($resourceIds as $id) {
                $permissions[$id] = $this->getSupportedRights();
            }

            return $permissions;
        }

        $dbAccess = $this->getServiceManager()->get(DataBaseAccess::SERVICE_ID);
        $userIds = $user->getRoles();
        $userIds[] = $user->getIdentifier();

        return $dbAccess->getPermissions($userIds, $resourceIds);
    }

    /**
     * (non-PHPdoc)
     * @param core_kernel_classes_Resource $resource
     *
     * @throws common_exception_Error
     *
     * @see \oat\generis\model\data\PermissionInterface::onResourceCreated()
     */
    public function onResourceCreated(core_kernel_classes_Resource $resource)
    {
        $dbAccess = $this->getServiceLocator()->get(DataBaseAccess::SERVICE_ID);
        // verify resource is created
        $permissions = $dbAccess->getResourcePermissions($resource->getUri());
        if (empty($permissions)) {
            // treat resources as classes without parent classes
            $class = new core_kernel_classes_Class($resource);
            foreach (array_merge($resource->getTypes(), $class->getParentClasses()) as $parent) {
                foreach (AdminService::getUsersPermissions($parent->getUri()) as $userUri => $rights) {
                    $dbAccess->addPermissions($userUri, $resource->getUri(), $rights);
                }
            }
        }
    }

    /**
     * (non-PHPdoc)
     * @see \oat\generis\model\data\permission\PermissionInterface::getSupportedRights()
     */
    public function getSupportedRights()
    {
        return [
            self::PERMISSION_GRANT,
            self::PERMISSION_WRITE,
            self::PERMISSION_READ
        ];
    }


    /**
     * Returns an associativ array with permission ids as keys
     * and labels as values
     *
     * @return array
     */
    public static function getRightLabels()
    {
        return [
            self::PERMISSION_GRANT => __('grant'),
            self::PERMISSION_WRITE => __('write'),
            self::PERMISSION_READ  => __('read')
        ];
    }

    public static function getSupportedRootClasses()
    {
        return [
            new core_kernel_classes_Class(TaoOntology::OBJECT_CLASS_URI),
            new core_kernel_classes_Class(GenerisRdf::CLASS_GENERIS_USER),
            new core_kernel_classes_Class(GenerisRdf::CLASS_ROLE)
        ];
    }

    /**
     * @deprecated Use RolePrivilegeRetriever::retrieveByResourceIds()
     */
    public function getResourceAccessData(string $resourceId): array
    {
        return $this->getRolePrivilegeRetriever()->retrieveByResourceIds([$resourceId]);
    }

    private function getRolePrivilegeRetriever(): RolePrivilegeRetriever
    {
        return $this->getServiceLocator()->get(RolePrivilegeRetriever::class);
    }
}