/**
    * Copyright 2005-2013 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 edu.sampleu.travel.bo.TravelAccount;
  import org.kuali.rice.kew.api.identity.Id;
  import org.kuali.rice.kew.api.identity.PrincipalName;
  import org.kuali.rice.kew.api.rule.RoleName;
  import org.kuali.rice.kew.engine.RouteContext;
  import org.kuali.rice.kew.routeheader.DocumentContent;
  import org.kuali.rice.kew.rule.AbstractRoleAttribute;
  import org.kuali.rice.kew.rule.ResolvedQualifiedRole;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.workflow.WorkflowUtils;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  import javax.xml.namespace.QName;
  import javax.xml.xpath.XPath;
  import javax.xml.xpath.XPathConstants;
  import javax.xml.xpath.XPathExpressionException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Resolves FO's using the accounts associated with the document XPath xpath =
   * KualiWorkflowUtils.getXPath(documentContent.getDocument()); List<String> qualifiers = new ArrayList<String>(); NodeList
   * accountNums = (NodeList)xstreamSafeEval(xpath, "//edu.sampleu.travel.workflow.bo.TravelAccount/number",
   * documentContent.getDocument(), XPathConstants.NODESET); for (int i = 0; i < accountNums.getLength(); i++) { Node accountNum =
   * accountNums.item(i); String accuntNumVal = accountNum.getNodeValue(); }
   */
  public class AccountAttribute extends AbstractRoleAttribute {
      private static final RoleName FISCAL_OFFICER_ROLE = new RoleName(AccountAttribute.class.getName(), "FO", "Fiscal Officer");
      private static final List<RoleName> ROLES;
      static {
          List<RoleName> tmp = new ArrayList<RoleName>(1);
          tmp.add(FISCAL_OFFICER_ROLE);
          ROLES = Collections.unmodifiableList(tmp);
      }
  
  
      public List<String> getQualifiedRoleNames(String roleName, DocumentContent documentContent) {
          List<String> qualifiedRoleNames = new ArrayList<String>();
          XPath xpath = WorkflowUtils.getXPath(documentContent.getDocument());
          // This xpath stream needs updating when the TravelAccount is being updated
          NodeList accountNums = (NodeList) xstreamSafeEval(xpath, "/documentContent/applicationContent/org.kuali.rice.krad.workflow.KualiDocumentXmlMaterializer/document/travelAccounts/vector/default/elementData/edu.sampleu.travel.bo.TravelAccount/number", documentContent.getDocument(), XPathConstants.NODESET);
          for (int i = 0; i < accountNums.getLength(); i++) {
              Node accountNum = accountNums.item(i);
              String accuntNumVal = accountNum.getTextContent();
              qualifiedRoleNames.add(accuntNumVal);
          }
          return qualifiedRoleNames;
      }
  
  
      public List<RoleName> getRoleNames() {
          return ROLES;
      }
  
  
      public ResolvedQualifiedRole resolveQualifiedRole(RouteContext routeContext, String roleName, String qualifiedRole) {
          String accountNum = qualifiedRole;
          TravelAccount account = new TravelAccount();
          account.setNumber(accountNum);
          account = (TravelAccount) KRADServiceLocator.getBusinessObjectService().retrieve(account);
          if (account == null) {
              throw new RuntimeException("Account " + accountNum + " does not exist!");
          }
          ResolvedQualifiedRole qualRole = new ResolvedQualifiedRole();
          qualRole.setAnnotation("Account " + accountNum + " FO");
          qualRole.setQualifiedRoleLabel("Fiscal Officer Account " + accountNum);
          List<Id> ids = new ArrayList<Id>();
          ids.add(new PrincipalName(account.getFiscalOfficer().getUserName()));
          qualRole.setRecipients(ids);
          return qualRole;
      }
  
  
      /**
       * This method will do a simple XPath.evaluate, while wrapping your xpathExpression with the xstreamSafe function. It assumes a
       * String result, and will return such. If an XPathExpressionException is thrown, this will be re-thrown within a
       * RuntimeException.
       * 
       * @param xpath A correctly initialized XPath instance.
       * @param xpathExpression Your XPath Expression that needs to be wrapped in an xstreamSafe wrapper and run.
      * @param item The document contents you will be searching within.
      * @return The string value of the xpath.evaluate().
      */
     public static final Object xstreamSafeEval(XPath xpath, String xpathExpression, Object item, QName returnType) {
         String xstreamSafeXPath = new StringBuilder(WorkflowUtils.XSTREAM_SAFE_PREFIX).append(xpathExpression).append(WorkflowUtils.XSTREAM_SAFE_SUFFIX).toString();
         try {
             return xpath.evaluate(xstreamSafeXPath, item, returnType);
         }
         catch (XPathExpressionException e) {
             throw new RuntimeException("XPathExpressionException occurred on xpath: " + xstreamSafeXPath, e);
         }
     }
     }