/*

  * Copyright 2007-2009 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl2.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kim.rules.ui;

 import java.util.HashMap;

 import java.util.Map;

 import org.apache.commons.lang.StringUtils;

 import org.kuali.rice.core.util.RiceKeyConstants;

 import org.kuali.rice.kim.api.permission.Permission;

 import org.kuali.rice.kim.bo.ui.KimDocumentRolePermission;

 import org.kuali.rice.kim.document.IdentityManagementRoleDocument;

 import org.kuali.rice.kim.rule.event.ui.AddPermissionEvent;

 import org.kuali.rice.kim.rule.ui.AddPermissionRule;

 import org.kuali.rice.kim.util.KimConstants;

 import org.kuali.rice.krad.rules.DocumentRuleBase;

 import org.kuali.rice.krad.util.GlobalVariables;

 /**

  * This is a description of what this class does - shyu don't forget to fill this in. 

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public class KimDocumentPermissionRule extends DocumentRuleBase implements AddPermissionRule {

         public static final String ERROR_PATH = "document.permission.permissionId";

         public boolean processAddPermission(AddPermissionEvent addPermissionEvent) {

                 KimDocumentRolePermission newPermission = addPermissionEvent.getPermission();

                 if(newPermission==null || StringUtils.isEmpty(newPermission.getPermissionId())){

                         GlobalVariables.getMessageMap().putError(ERROR_PATH, RiceKeyConstants.ERROR_EMPTY_ENTRY, new String[] {"Permission"});

                         return false;

                 }

                 Permission kimPermissionInfo = newPermission.getPermission();

                 if(kimPermissionInfo==null){

                         GlobalVariables.getMessageMap().putError(ERROR_PATH, RiceKeyConstants.ERROR_EMPTY_ENTRY, new String[] {"Permission"});

                         return false;

                 }

             boolean rulePassed = true;

                 IdentityManagementRoleDocument document = (IdentityManagementRoleDocument)addPermissionEvent.getDocument();

                 if(!hasPermissionToGrantPermission(kimPermissionInfo, document)){

                 GlobalVariables.getMessageMap().putError(KimDocumentPermissionRule.ERROR_PATH, RiceKeyConstants.ERROR_ASSIGN_PERMISSION, 

                                 new String[] {kimPermissionInfo.getNamespaceCode(), kimPermissionInfo.getTemplate().getName()});

                 return false;

                 }

                 if (newPermission == null || StringUtils.isBlank(newPermission.getPermissionId())) {

             rulePassed = false;

             GlobalVariables.getMessageMap().putError(ERROR_PATH, RiceKeyConstants.ERROR_EMPTY_ENTRY, new String[] {"Permission"});

         } else {

                     int i = 0;

                 for (KimDocumentRolePermission permission: document.getPermissions()) {

                             if (permission.getPermissionId().equals(newPermission.getPermissionId())) {

                             rulePassed = false;

                             GlobalVariables.getMessageMap().putError("document.permissions["+i+"].permissionId", RiceKeyConstants.ERROR_DUPLICATE_ENTRY, new String[] {"Permission"});

                             }

                             i++;

                     }

         }

                 return rulePassed;

         } 

         public boolean hasPermissionToGrantPermission(Permission kimPermissionInfo , IdentityManagementRoleDocument document){

                 Map<String,String> permissionDetails = new HashMap<String,String>();

                 permissionDetails.put(KimConstants.AttributeConstants.NAMESPACE_CODE, kimPermissionInfo.getNamespaceCode());

                 permissionDetails.put(KimConstants.AttributeConstants.PERMISSION_NAME, kimPermissionInfo.getTemplate().getName());

                 if (!getDocumentHelperService().getDocumentAuthorizer(document).isAuthorizedByTemplate(

                                 document, 

                                 KimConstants.NAMESPACE_CODE, 

                                 KimConstants.PermissionTemplateNames.GRANT_PERMISSION, 

                                 GlobalVariables.getUserSession().getPerson().getPrincipalId(), 

                                 permissionDetails, null)) {

                 return false;

                 }

                 return true;

         }

 }