/*
    * 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 members 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.services.KimApiServiceLocator;
  import org.kuali.rice.kim.bo.ui.GroupDocumentMember;
  import org.kuali.rice.kim.document.IdentityManagementGroupDocument;
  import org.kuali.rice.kim.rule.event.ui.AddGroupMemberEvent;
  import org.kuali.rice.kim.rule.ui.AddGroupMemberRule;
  import org.kuali.rice.kim.api.group.GroupService;
  //import org.kuali.rice.kim.api.group.GroupServiceBase;
  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 GroupDocumentMemberRule extends DocumentRuleBase implements AddGroupMemberRule {
  
  	private static final String ERROR_PATH = "document.member.memberId";
  
  	public boolean processAddGroupMember(AddGroupMemberEvent addGroupMemberEvent){
  		GroupDocumentMember newMember = addGroupMemberEvent.getMember();
  		IdentityManagementGroupDocument document = (IdentityManagementGroupDocument)addGroupMemberEvent.getDocument();
  	    boolean rulePassed = true;
  
          if (newMember == null || StringUtils.isBlank(newMember.getMemberId())){
              GlobalVariables.getMessageMap().putError(ERROR_PATH, RiceKeyConstants.ERROR_EMPTY_ENTRY, new String[] {"Member"});
              return false;
          }
      	if(!validAssignGroup(newMember, document))
      		return false;
  
  	    int i = 0;
  	    for (GroupDocumentMember member: document.getMembers()){
  	    	if (member.getMemberId().equals(newMember.getMemberId()) && member.getMemberTypeCode().equals(newMember.getMemberTypeCode())){
  	            rulePassed = false;
  	            GlobalVariables.getMessageMap().putError("document.members["+i+"].memberId", RiceKeyConstants.ERROR_DUPLICATE_ENTRY, new String[] {"Member"});
  	    	}
  	    	i++;
  	    }
  	    
  	    // check for circular reference
  		GroupService groupService = KimApiServiceLocator.getGroupService();
  		if (groupService.isGroupMemberOfGroup(document.getGroupId(),newMember.getMemberId())){
              GlobalVariables.getMessageMap().putError(ERROR_PATH, RiceKeyConstants.ERROR_ASSIGN_GROUP_MEMBER_CIRCULAR, new String[] {newMember.getMemberId()});
  			return false;
  		}
  	    
  		return rulePassed;
  	} 
  
  	protected boolean validAssignGroup(GroupDocumentMember groupMember, IdentityManagementGroupDocument document){
          boolean rulePassed = true;
  		if(StringUtils.isNotEmpty(document.getGroupNamespace())){
  			Map<String,String> roleDetails = new HashMap<String,String>();
  			roleDetails.put(KimConstants.AttributeConstants.NAMESPACE_CODE, document.getGroupNamespace());
  			roleDetails.put(KimConstants.AttributeConstants.GROUP_NAME, document.getGroupName());
  			if (!getDocumentHelperService().getDocumentAuthorizer(document).isAuthorizedByTemplate(
  					document, 
  					KimConstants.NAMESPACE_CODE, 
  					KimConstants.PermissionTemplateNames.POPULATE_GROUP, 
  					GlobalVariables.getUserSession().getPerson().getPrincipalId(), 
  					roleDetails, null)){
  	            GlobalVariables.getMessageMap().putError(ERROR_PATH, RiceKeyConstants.ERROR_ASSIGN_GROUP, 
  	            		new String[] {document.getGroupNamespace(), document.getGroupName()});
  	            rulePassed = false;
  			}
  		}
  		return rulePassed;
  	}
  
  }