/*

  * Copyright 2007-2010 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.service.impl;

 import org.apache.commons.collections.CollectionUtils;

 import org.apache.commons.collections.Predicate;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.exception.RiceRuntimeException;

 import org.kuali.rice.kim.bo.group.dto.GroupInfo;

 import org.kuali.rice.kim.bo.group.impl.GroupAttributeDataImpl;

 import org.kuali.rice.kim.bo.group.impl.GroupMemberImpl;

 import org.kuali.rice.kim.bo.impl.GroupImpl;

 import org.kuali.rice.kim.service.GroupUpdateService;

 import org.kuali.rice.kim.service.KIMServiceLocator;

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

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

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

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

 import org.mortbay.log.Log;

 import javax.jws.WebService;

 import java.util.*;

 /**

  * This is the default implementation for the {@link GroupUpdateService}, where the write methods for KIM groups are located.

  *

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

  *

  */

 @WebService(endpointInterface = KIMWebServiceConstants.GroupUpdateService.INTERFACE_CLASS, serviceName = KIMWebServiceConstants.GroupUpdateService.WEB_SERVICE_NAME, portName = KIMWebServiceConstants.GroupUpdateService.WEB_SERVICE_PORT, targetNamespace = KIMWebServiceConstants.MODULE_TARGET_NAMESPACE)

 public class GroupUpdateServiceImpl extends GroupServiceBase implements GroupUpdateService {

         private static final Logger LOG = Logger.getLogger(GroupUpdateServiceImpl.class);

         /**

      * @see org.kuali.rice.kim.service.GroupService#addGroupToGroup(java.lang.String, java.lang.String)

      */

     public boolean addGroupToGroup(String childId, String parentId) {

         if(childId.equals(parentId)) {

             throw new IllegalArgumentException("Can't add group to itself.");

         }

         if(isGroupMemberOfGroup(parentId, childId)) {

             throw new IllegalArgumentException("Circular group reference.");

         }

         GroupMemberImpl groupMember = new GroupMemberImpl();

         groupMember.setGroupId(parentId);

         groupMember.setMemberTypeCode( KimGroupMemberTypes.GROUP_MEMBER_TYPE );

         groupMember.setMemberId(childId);

         getBusinessObjectService().save(groupMember);

         getIdentityManagementNotificationService().groupUpdated();

         return true;

     }

     /**

      * @see org.kuali.rice.kim.service.GroupService#addPrincipalToGroup(java.lang.String, java.lang.String)

      */

     public boolean addPrincipalToGroup(String principalId, String groupId) {

         GroupMemberImpl groupMember = new GroupMemberImpl();

         groupMember.setGroupId(groupId);

         groupMember.setMemberTypeCode( KimGroupMemberTypes.PRINCIPAL_MEMBER_TYPE );

         groupMember.setMemberId(principalId);

         getBusinessObjectService().save(groupMember);

         KIMServiceLocator.getGroupInternalService().updateForUserAddedToGroup(groupMember.getMemberId(), groupMember.getGroupId());

         getIdentityManagementNotificationService().groupUpdated();

         return true;

     }

     public GroupInfo createGroup(GroupInfo groupInfo) {

         GroupImpl group = new GroupImpl();

         group = KimCommonUtils.copyInfoToGroup(groupInfo, group);

         saveGroup(group);

         GroupInfo newGroupInfo = getGroupInfoByName(groupInfo.getNamespaceCode(), groupInfo.getGroupName());

         if(groupInfo.getAttributes() != null && groupInfo.getAttributes().size() > 0) {

             List<GroupAttributeDataImpl> groupAttributes =

                             KimCommonUtils.copyInfoAttributesToGroupAttributes(groupInfo.getAttributes(), newGroupInfo.getGroupId(), newGroupInfo.getKimTypeId());

             saveGroupAttributes(groupAttributes);

         }

         return getGroupInfo(newGroupInfo.getGroupId());

     }

     /**

     *

     * @see org.kuali.rice.kim.service.GroupUpdateService#removeAllGroupMembers(java.lang.String)

     */

    public void removeAllGroupMembers(String groupId) {

        List<String> memberPrincipalsBefore = KIMServiceLocator.getGroupService().getMemberPrincipalIds(groupId);

        Collection<GroupMemberImpl> toDeactivate = getActiveGroupMembers(groupId, null, null);

        java.sql.Timestamp today = new java.sql.Timestamp(System.currentTimeMillis());

        // Set principals as inactive

         for (GroupMemberImpl aToDeactivate : toDeactivate) {

             aToDeactivate.setActiveToDate(today);

         }

        // Save

        getBusinessObjectService().save(new ArrayList<GroupMemberImpl>(toDeactivate));

        List<String> memberPrincipalsAfter = KIMServiceLocator.getGroupService().getMemberPrincipalIds(groupId);

        if (!CollectionUtils.isEmpty(memberPrincipalsAfter)) {

                // should never happen!

                Log.warn("after attempting removal of all members, group with id '" + groupId + "' still has principal members");

        }

        // do updates

        KIMServiceLocator.getGroupInternalService().updateForWorkgroupChange(groupId, memberPrincipalsBefore, memberPrincipalsAfter);

        getIdentityManagementNotificationService().groupUpdated();

    }

         /**

      * @see org.kuali.rice.kim.service.GroupService#removeGroupFromGroup(java.lang.String, java.lang.String)

      */

     public boolean removeGroupFromGroup(String childId, String parentId) {

             java.sql.Timestamp today = new java.sql.Timestamp(System.currentTimeMillis());

             List<GroupMemberImpl> groupMembers =

                     getActiveGroupMembers(parentId, childId, KimGroupMemberTypes.GROUP_MEMBER_TYPE);

         if(groupMembers.size() == 1) {

                 GroupMemberImpl groupMember = groupMembers.get(0);

                 groupMember.setActiveToDate(today);

             getBusinessObjectService().save(groupMember);

             getIdentityManagementNotificationService().groupUpdated();

             return true;

         }

         return false;

     }

         /**

      * @see org.kuali.rice.kim.service.GroupService#removePrincipalFromGroup(java.lang.String, java.lang.String)

      */

     @SuppressWarnings("unchecked")

     public boolean removePrincipalFromGroup(String principalId, String groupId) {

             List<GroupMemberImpl> groupMembers =

                     getActiveGroupMembers(groupId, principalId, KimGroupMemberTypes.PRINCIPAL_MEMBER_TYPE);

         if(groupMembers.size() == 1) {

                 GroupMemberImpl member = groupMembers.iterator().next();

                 member.setActiveToDate(new java.sql.Timestamp(System.currentTimeMillis()));

                 getBusinessObjectService().save(member);

             KIMServiceLocator.getGroupInternalService().updateForUserRemovedFromGroup(member.getMemberId(), member.getGroupId());

             getIdentityManagementNotificationService().groupUpdated();

             return true;

         }

         return false;

     }

         /**

          * This overridden method ...

          *

          * @see org.kuali.rice.kim.service.GroupUpdateService#updateGroup(java.lang.String, org.kuali.rice.kim.bo.group.dto.GroupInfo)

          */

         public GroupInfo updateGroup(String groupId, GroupInfo groupInfo) {

         // TODO sgibson - can this be used to change id?

         GroupImpl group = getGroupImpl(groupId);

         if (group == null) {

             throw new IllegalArgumentException("Group not found for update.");

         }

         group = KimCommonUtils.copyInfoToGroup(groupInfo, group);

         //delete old group attributes

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

         criteria.put(KIMPropertyConstants.Group.GROUP_ID, group.getGroupId());

         getBusinessObjectService().deleteMatching(GroupAttributeDataImpl.class, criteria);

         saveGroup(group);

         //create new group attributes

         if(groupInfo.getAttributes() != null && groupInfo.getAttributes().size() > 0) {

             List<GroupAttributeDataImpl> groupAttributes =

                             KimCommonUtils.copyInfoAttributesToGroupAttributes(groupInfo.getAttributes(), group.getGroupId(), group.getKimTypeId());

             saveGroupAttributes(groupAttributes);

         }

         return getGroupInfo(groupInfo.getGroupId());

     }

         protected void saveGroup(GroupImpl group) {

                 if ( group == null ) {

                         return;

                 } else if (group.getGroupId() != null) {

                         // Get the version of the group that is in the DB

                         GroupImpl oldGroup = getGroupImpl(group.getGroupId());

                         if (oldGroup != null) {

                                 // Inactivate and re-add members no longer in the group (in order to preserve history).

                                 java.sql.Timestamp activeTo = new java.sql.Timestamp(System.currentTimeMillis());

                                 List<GroupMemberImpl> toReAdd = null;

                                 if (oldGroup.getMembers() != null) for (GroupMemberImpl member : oldGroup.getMembers()) {

                                         // if the old member isn't in the new group

                                         if (group.getMembers() == null || !group.getMembers().contains(member)) {

                                                 // inactivate the member

                                                 member.setActiveToDate(activeTo);

                                                 if (toReAdd == null) { toReAdd = new ArrayList<GroupMemberImpl>(); }

                                                 // queue it up for re-adding

                                                 toReAdd.add(member);

                                         }

                                 }

                                 // do the re-adding

                                 if (toReAdd != null) {

                                         List<GroupMemberImpl> groupMembers = group.getMembers();

                                         if (groupMembers == null) { groupMembers = new ArrayList<GroupMemberImpl>(toReAdd.size()); }

                                         group.setMembers(groupMembers);

                                 }

                         }

                 }

                 // GroupInternalService handles KEW update duties

                 KIMServiceLocator.getGroupInternalService().saveWorkgroup(group);

                 getIdentityManagementNotificationService().groupUpdated();

         }

         protected void saveGroupAttributes(List<GroupAttributeDataImpl> groupAttributes) {

         if ( groupAttributes == null ) {

             return;

         }

         getBusinessObjectService().save( groupAttributes );

     }

         protected void deleteGroupAttribute(GroupAttributeDataImpl groupAttribute) {

         if ( groupAttribute == null ) {

             return;

         }

         getBusinessObjectService().delete( groupAttribute );

     }

         /**

          * This helper method gets the active group members of the specified type (see {@link KimGroupMemberTypes}).

          * If the optional params are null, it will return all active members for the specified group regardless

          * of type.

          *

          * @param parentId

          * @param childId optional, but if provided then memberType must be too

          * @param memberType optional, but must be provided if childId is

      * @return a list of group members

          */

         private List<GroupMemberImpl> getActiveGroupMembers(String parentId,

                         String childId, String memberType) {

             final java.sql.Date today = new java.sql.Date(System.currentTimeMillis());

             if (childId != null && memberType == null) throw new RiceRuntimeException("memberType must be non-null if childId is non-null");

                 Map<String,Object> criteria = new HashMap<String,Object>(4);

         criteria.put(KIMPropertyConstants.GroupMember.GROUP_ID, parentId);

         if (childId != null) {

                 criteria.put(KIMPropertyConstants.GroupMember.MEMBER_ID, childId);

                 criteria.put(KIMPropertyConstants.GroupMember.MEMBER_TYPE_CODE, memberType);

         }

         Collection<GroupMemberImpl> groupMembers = getBusinessObjectService().findMatching(GroupMemberImpl.class, criteria);

         CollectionUtils.filter(groupMembers, new Predicate() {

                         public boolean evaluate(Object object) {

                                 GroupMemberImpl member = (GroupMemberImpl) object;

                                 // keep in the collection (return true) if the activeToDate is null, or if it is set to a future date

                                 return member.getActiveToDate() == null || today.before(member.getActiveToDate());

                         }

                 });

         return new ArrayList<GroupMemberImpl>(groupMembers);

         }

 }