/**
    * Copyright 2005-2012 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 edu.sampleu.travel.workflow;
  
  import org.kuali.rice.core.api.exception.RiceRuntimeException;
  import org.kuali.rice.core.api.util.xml.XmlHelper;
  import org.kuali.rice.kew.engine.RouteContext;
  import org.kuali.rice.kew.framework.support.krms.RulesEngineExecutor;
  import org.kuali.rice.kew.rule.xmlrouting.XPathHelper;
  import org.kuali.rice.krms.api.engine.Engine;
  import org.kuali.rice.krms.api.engine.EngineResults;
  import org.kuali.rice.krms.api.engine.Facts;
  import org.kuali.rice.krms.api.engine.SelectionCriteria;
  import org.w3c.dom.Document;
  
  import javax.xml.xpath.XPath;
  import javax.xml.xpath.XPathConstants;
  import java.io.ByteArrayInputStream;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * A simple sample RulesEngineExecutor usable in the sample app which is hard-coded to select a context with
   * namespaceCode="KR-SAP" and name="Travel Account ".  It also is hardcoded to select an agenda from the context with an
   * event name of "workflow".
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class TravelAccountRulesEngineExecutor implements RulesEngineExecutor {
  
      private static final String CONTEXT_NAMESPACE_CODE = "KR-SAP";
      private static final String CONTEXT_NAME = "Travel Account";
  
      @Override
      public EngineResults execute(RouteContext routeContext, Engine engine) {
          Map<String, String> contextQualifiers = new HashMap<String, String>();
          contextQualifiers.put("namespaceCode", CONTEXT_NAMESPACE_CODE);
          contextQualifiers.put("name", CONTEXT_NAME);
          SelectionCriteria sectionCriteria = SelectionCriteria.createCriteria(null, contextQualifiers,
                  Collections.singletonMap("Campus", "BL"));
  
          // extract facts from routeContext
          String docContent = routeContext.getDocument().getDocContent();
  
          String subsidizedPercentStr = getElementValue(docContent, "//newMaintainableObject//subsidizedPercent");
          String accountTypeCode =
                  getElementValue(docContent, "//newMaintainableObject/dataObject/extension/accountTypeCode");
          String initiator = getElementValue(docContent, "//documentInitiator//principalId");
  
          Facts.Builder factsBuilder = Facts.Builder.create();
  
          factsBuilder.addFact("Subsidized Percent", Double.valueOf(subsidizedPercentStr));
          factsBuilder.addFact("Account Type Code", accountTypeCode);
          factsBuilder.addFact("Initiator Principal ID", initiator);
  
          return engine.execute(sectionCriteria, factsBuilder.build(), null);
      }
  
      private String getElementValue(String docContent, String xpathExpression) {
          try {
              Document document = XmlHelper.trimXml(new ByteArrayInputStream(docContent.getBytes()));
  
              XPath xpath = XPathHelper.newXPath();
              String value = (String)xpath.evaluate(xpathExpression, document, XPathConstants.STRING);
  
              return value;
  
          } catch (Exception e) {
              throw new RiceRuntimeException();
          }
      }
  
  //    public static void main(String [] args) throws Exception {
  //
  //        String sampleDocContent = FileUtils.readFileToString(new File("/home/gilesp/tmp/SampleDocContent.txt"));
  //
  //        RouteContext rc = new RouteContext();
  //        DocumentRouteHeaderValue document = new DocumentRouteHeaderValue();
  //        DocumentRouteHeaderValueContent content = new DocumentRouteHeaderValueContent();
  //        content.setDocumentContent(sampleDocContent);
  //        document.setDocumentContent(content);
  //        rc.setDocument(document);
  //
  //        new TravelAccountRulesEngineExecutor().execute(rc, null);
  //    }
 }