/**

  * Copyright 2005-2011 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.kew.identity.service.impl;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.kuali.rice.core.api.exception.RiceIllegalArgumentException;

 import org.kuali.rice.kew.actionrequest.KimPrincipalRecipient;

 import org.kuali.rice.kew.actionrequest.Recipient;

 import org.kuali.rice.kew.api.KewApiConstants;

 import org.kuali.rice.kew.api.identity.EmployeeId;

 import org.kuali.rice.kew.api.identity.PrincipalId;

 import org.kuali.rice.kew.api.identity.PrincipalName;

 import org.kuali.rice.kew.api.user.UserId;

 import org.kuali.rice.kew.identity.service.IdentityHelperService;

 import org.kuali.rice.kew.workgroup.GroupId;

 import org.kuali.rice.kew.workgroup.GroupNameId;

 import org.kuali.rice.kew.workgroup.WorkflowGroupId;

 import org.kuali.rice.kim.api.group.Group;

 import org.kuali.rice.kim.api.identity.Person;

 import org.kuali.rice.kim.api.identity.principal.Principal;

 import org.kuali.rice.kim.api.services.KimApiServiceLocator;

 /**

  *

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

  *

  */

 public class IdentityHelperServiceImpl implements IdentityHelperService {

         private static final Log logger = LogFactory.getLog(IdentityHelperServiceImpl.class);

                 public String getIdForPrincipalName(String principalName) {

                 if (principalName == null) {

                         throw new RiceIllegalArgumentException("Can't lookup a principal ID for a null principal name.");

                 }

                 Principal principal = KimApiServiceLocator.getIdentityService().getPrincipalByPrincipalName(principalName);

                 if (principal == null) {

                         throw new RiceIllegalArgumentException("Given principal name of '" + principalName + "' was invalid.  Failed to lookup a corresponding principal ID.");

                 }

                 return principal.getPrincipalId();

         }

                 public void validatePrincipalId(String principalId) {

                         // the getPrincipal method attempts to load the principal with the id and throws an exception if it fails

                         getPrincipal(principalId);

                 }

         public String getIdForGroupName(String namespace, String groupName) {

                 Group group = KimApiServiceLocator.getGroupService().getGroupByNameAndNamespaceCode(namespace, groupName);

                 if (group == null) {

                         throw new RiceIllegalArgumentException("Given namespace of '" + namespace + "' and name of '" + groupName + "' was invalid.  Failed to lookup a corresponding group ID.");

                 }

                 return group.getId();

         }

         public Recipient getPrincipalRecipient(String principalId) {

                 Principal principal = getPrincipal(principalId);

                 return new KimPrincipalRecipient(principal);

         }

         public Principal getPrincipal(String principalId) {

                 Principal principal = KimApiServiceLocator.getIdentityService().getPrincipal(principalId);

                 if (principal == null) {

                         throw new RiceIllegalArgumentException("Could not locate a principal with the given principalId of " + principalId);

                 }

                 return principal;

         }

         public Principal getPrincipalByPrincipalName(String principalName) {

                 Principal principal = KimApiServiceLocator.getIdentityService().getPrincipalByPrincipalName(principalName);

                 if (principal == null) {

                         throw new RiceIllegalArgumentException("Could not locate a principal with the given principalName of " + principalName);

                 }

                 return principal;

         }

         public Group getGroupByName(String namespaceCode, String name) {

                 Group group = KimApiServiceLocator.getGroupService().getGroupByNameAndNamespaceCode(namespaceCode, name);

                 if (group == null) {

                         throw new RiceIllegalArgumentException("Could not locate a group with the given namspace of '" + namespaceCode + "' and group name of '" + name + "'");

                 }

                 return group;

         }

         public Person getPerson(String principalId) {

                 Person person = KimApiServiceLocator.getPersonService().getPerson(principalId);

                 if (person == null) {

                         throw new RiceIllegalArgumentException("Could not locate a person with the given principal id of " + principalId);

                 }

                 return person;

         }

         public Person getPersonByPrincipalName(String principalName) {

                 Person person = KimApiServiceLocator.getPersonService().getPersonByPrincipalName(principalName);

                 if (person == null) {

                         throw new RiceIllegalArgumentException("Could not locate a person with the given principal name of " + principalName);

                 }

                 return person;

         }

         public Person getPersonByEmployeeId(String employeeId) {

                 Person person = KimApiServiceLocator.getPersonService().getPersonByEmployeeId(employeeId);

                 if (person == null) {

                         throw new RiceIllegalArgumentException("Could not locate a person with the given employee id of " + employeeId);

                 }

                 return person;

         }

         public Group getGroup(String groupId) {

                 Group group = KimApiServiceLocator.getGroupService().getGroup(groupId);

                 if (group == null) {

                         throw new RiceIllegalArgumentException("Could not locate a group with the given groupId of " + groupId);

                 }

                 return group;

         }

         public Group getGroup(GroupId groupId) {

                 if (groupId == null || groupId.isEmpty()) {

                         return null;

                 } else if (groupId instanceof WorkflowGroupId) {

                         return KimApiServiceLocator.getGroupService().getGroup(""+((WorkflowGroupId)groupId).getGroupId());

                 } else if (groupId instanceof GroupNameId) {

                         return KimApiServiceLocator.getGroupService().getGroupByNameAndNamespaceCode(

                     ((GroupNameId) groupId).getNamespace(), ((GroupNameId) groupId).getNameId());

                 }

                 throw new RiceIllegalArgumentException("Invalid GroupId type was passed: " + groupId);

         }

         public Principal getPrincipal(UserId userId) {

                 if (userId == null) {

                         return null;

                 } else if (userId instanceof PrincipalId) {

                         String principalId = ((PrincipalId)userId).getPrincipalId();

                         return KimApiServiceLocator.getIdentityService().getPrincipal(principalId);

                 } else if (userId instanceof PrincipalName) {

                         String principalName = ((PrincipalName)userId).getId();

                         return KimApiServiceLocator.getIdentityService().getPrincipalByPrincipalName(principalName);

                 } else if (userId instanceof EmployeeId) {

                         String employeeId = ((EmployeeId)userId).getEmployeeId();

                         Person person = getPersonByEmployeeId(employeeId);

                         return getPrincipal(person.getPrincipalId());

                 }

                 throw new RiceIllegalArgumentException("Invalid UserIdDTO type was passed: " + userId);

         }

         public Principal getSystemPrincipal() {

                 return getPrincipalByPrincipalName(KewApiConstants.SYSTEM_USER);

         }

 }