/*
    * Copyright 2005-2009 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.kew.xml.export;
  
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.DELEGATION_TYPE;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.GROUP_NAME;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.NAMESPACE;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.PARENT_RESPONSIBILITY;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.PARENT_RULE_NAME;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.PRINCIPAL_NAME;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.ROLE;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.RULE_DELEGATION;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.RULE_DELEGATIONS;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.RULE_NAMESPACE;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.RULE_SCHEMA_LOCATION;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.SCHEMA_LOCATION_ATTR;
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.SCHEMA_NAMESPACE;
  
  import java.util.Iterator;
  
  import org.jdom.Element;
  import org.kuali.rice.core.api.exception.RiceRuntimeException;
  import org.kuali.rice.core.api.impex.ExportDataSet;
  import org.kuali.rice.core.framework.impex.xml.XmlExporter;
  import org.kuali.rice.core.util.xml.XmlRenderer;
  import org.kuali.rice.kew.export.KewExportDataSet;
  import org.kuali.rice.kew.rule.RuleBaseValues;
  import org.kuali.rice.kew.rule.RuleDelegation;
  import org.kuali.rice.kew.rule.RuleResponsibility;
  import org.kuali.rice.kew.service.KEWServiceLocator;
  import org.kuali.rice.kim.api.entity.principal.Principal;
  import org.kuali.rice.kim.api.group.Group;
  
  /**
   * Exports rules to XML.
   *
   * @see RuleBaseValues
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class RuleDelegationXmlExporter implements XmlExporter {
  
      protected final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(getClass());
  
      private XmlRenderer renderer = new XmlRenderer(RULE_NAMESPACE);
      private RuleXmlExporter ruleExporter = new RuleXmlExporter(RULE_NAMESPACE);
  
  	@Override
  	public boolean supportPrettyPrint() {
  		return true;
  	}
  
      public Element export(ExportDataSet exportDataSet) {
      	KewExportDataSet dataSet = KewExportDataSet.fromExportDataSet(exportDataSet);
          if (!dataSet.getRuleDelegations().isEmpty()) {
              Element rootElement = renderer.renderElement(null, RULE_DELEGATIONS);
              rootElement.setAttribute(SCHEMA_LOCATION_ATTR, RULE_SCHEMA_LOCATION, SCHEMA_NAMESPACE);
              for (Iterator iterator = dataSet.getRuleDelegations().iterator(); iterator.hasNext();) {
                  RuleDelegation ruleDelegation = (RuleDelegation) iterator.next();
                  exportRuleDelegation(rootElement, ruleDelegation);
              }
              return rootElement;
          }
          return null;
      }
  
      private void exportRuleDelegation(Element parent, RuleDelegation ruleDelegation) {
      	Element ruleDelegationElement = renderer.renderElement(parent, RULE_DELEGATION);
      	exportParentResponsibility(ruleDelegationElement, ruleDelegation);
      	renderer.renderTextElement(ruleDelegationElement, DELEGATION_TYPE, ruleDelegation.getDelegationType());
      	ruleExporter.exportRule(ruleDelegationElement, ruleDelegation.getDelegationRuleBaseValues());
      }
      
      private void exportParentResponsibility(Element parent, RuleDelegation delegation) {
          Element parentResponsibilityElement = renderer.renderElement(parent, PARENT_RESPONSIBILITY);
          RuleResponsibility ruleResponsibility = KEWServiceLocator.getRuleService().findRuleResponsibility(delegation.getResponsibilityId());
          renderer.renderTextElement(parentResponsibilityElement, PARENT_RULE_NAME, ruleResponsibility.getRuleBaseValues().getName());
          if (ruleResponsibility.isUsingWorkflowUser()) {
          	Principal principal = ruleResponsibility.getPrincipal();
          	renderer.renderTextElement(parentResponsibilityElement, PRINCIPAL_NAME, principal.getPrincipalName());
          } else if (ruleResponsibility.isUsingGroup()) {
          	Group group = ruleResponsibility.getGroup();
          	Element groupElement = renderer.renderElement(parentResponsibilityElement, GROUP_NAME);
          	groupElement.setText(group.getName());
          	groupElement.setAttribute(NAMESPACE, group.getNamespaceCode());
         } else if (ruleResponsibility.isUsingRole()) {
         	renderer.renderTextElement(parentResponsibilityElement, ROLE, ruleResponsibility.getRuleResponsibilityName());
         } else {
         	throw new RiceRuntimeException("Encountered a rule responsibility when exporting with an invalid type of '" + ruleResponsibility.getRuleResponsibilityType());
         }
     }
 
 }