/*

  * Copyright 2006-2011 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.edl.impl.components;

 import java.util.ArrayList;

 import java.util.Date;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import javax.xml.xpath.XPath;

 import javax.xml.xpath.XPathConstants;

 import javax.xml.xpath.XPathExpressionException;

 import javax.xml.xpath.XPathFactory;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.framework.services.CoreFrameworkServiceLocator;

 import org.kuali.rice.core.util.RiceConstants;

 import org.kuali.rice.core.util.xml.XmlJotter;

 import org.kuali.rice.edl.impl.EDLContext;

 import org.kuali.rice.edl.impl.EDLModelComponent;

 import org.kuali.rice.edl.impl.EDLXmlUtils;

 import org.kuali.rice.edl.impl.RequestParser;

 import org.kuali.rice.edl.impl.UserAction;

 import org.kuali.rice.edl.impl.service.EdlServiceLocator;

 import org.kuali.rice.kew.api.WorkflowDocument;

 import org.kuali.rice.kew.api.WorkflowRuntimeException;

 import org.kuali.rice.kew.exception.WorkflowException;

 import org.kuali.rice.kew.service.WorkflowInfo;

 import org.kuali.rice.kew.util.KEWConstants;

 import org.kuali.rice.krad.util.KRADConstants;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 /**

  * Generates document state based on the workflow document in session.

  *

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

  *

  */

 public class WorkflowDocumentState implements EDLModelComponent {

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

         // The order the enum values are listed determines the order the buttons appear on the screen

         private enum buttons{ACKNOWLEDGE, BLANKETAPPROVE, ROUTE, SAVE, COMPLETE, APPROVE, DISAPPROVE, 

             RETURNTOPREVIOUS, FYI, CANCEL};

         public void updateDOM(Document dom, Element configElement, EDLContext edlContext) {

                 try {

                         Element documentState = EDLXmlUtils.getDocumentStateElement(dom);

                         Element dateTime = EDLXmlUtils.getOrCreateChildElement(documentState, "dateTime", true);

                         dateTime.appendChild(dom.createTextNode(RiceConstants.getDefaultDateAndTimeFormat().format(new Date())));

                         Element definition = EDLXmlUtils.getOrCreateChildElement(documentState, "definition", true);

                         definition.appendChild(dom.createTextNode(edlContext.getEdocLiteAssociation().getDefinition()));

                         Element docType = EDLXmlUtils.getOrCreateChildElement(documentState, "docType", true);

                         docType.appendChild(dom.createTextNode(edlContext.getEdocLiteAssociation().getEdlName()));

                         Element style = EDLXmlUtils.getOrCreateChildElement(documentState, "style", true);

                         String styleName = edlContext.getEdocLiteAssociation().getStyle();

                         if (styleName == null) {

                                 styleName = "Default";

                         }

                         style.appendChild(dom.createTextNode(styleName));

                         Element showAttachments = EDLXmlUtils.getOrCreateChildElement(documentState, "showAttachments", true);

                         boolean showConstants = CoreFrameworkServiceLocator.getParameterService().getParameterValueAsBoolean(KEWConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.ALL_DETAIL_TYPE, KEWConstants.SHOW_ATTACHMENTS_IND);

                         showAttachments.appendChild(dom.createTextNode(Boolean.valueOf(showConstants).toString()));

                         WorkflowDocument document = (WorkflowDocument)edlContext.getRequestParser().getAttribute(RequestParser.WORKFLOW_DOCUMENT_SESSION_KEY);

                         WorkflowInfo info = new WorkflowInfo();

                         boolean documentEditable = false;

                         if (document != null) {

                                 List<String> validActions = determineValidActions(document);

                                 documentEditable = isEditable(edlContext, validActions);

                                 edlContext.getTransformer().setParameter("readOnly", String.valueOf(documentEditable));

                                 addActions(dom, documentState, validActions);

                                 boolean isAnnotatable = isAnnotatable(validActions);

                                 EDLXmlUtils.createTextElementOnParent(documentState, "annotatable", String.valueOf(isAnnotatable));

                                 EDLXmlUtils.createTextElementOnParent(documentState, "docId", document.getDocumentId());

                                 Element workflowDocumentStatus = EDLXmlUtils.getOrCreateChildElement(documentState, "workflowDocumentState", true);

                                 EDLXmlUtils.createTextElementOnParent(workflowDocumentStatus, "status", document.getStatus().getLabel());

                                 EDLXmlUtils.createTextElementOnParent(workflowDocumentStatus, "createDate", RiceConstants.getDefaultDateAndTimeFormat().format(document.getDateCreated().toDate()));

                                 List<String> nodeNames = document.getPreviousNodeNames();

                                 if (nodeNames.size() > 0) {

                                     Element previousNodes = EDLXmlUtils.getOrCreateChildElement(documentState, "previousNodes", true);

                                     // don't include LAST node (where the document is currently...don't want to return to current location)

                                     for (int i = 0; i < nodeNames.size(); i++) {

                                         EDLXmlUtils.createTextElementOnParent(previousNodes, "node", nodeNames.get(i));

                                     }

                                 }

                                 String[] currentNodeNames = info.getCurrentNodeNames(document.getDocumentId());

                                 for (String currentNodeName : currentNodeNames) {

                                     EDLXmlUtils.createTextElementOnParent(documentState, "currentNodeName", currentNodeName);

                                 }

                         }

                         Element editable = EDLXmlUtils.getOrCreateChildElement(documentState, "editable", true);

                         editable.appendChild(dom.createTextNode(String.valueOf(documentEditable)));

                         // display the buttons

                         EDLXmlUtils.createTextElementOnParent(documentState, "actionable", "true");

                         List globalErrors = (List)edlContext.getRequestParser().getAttribute(RequestParser.GLOBAL_ERRORS_KEY);

                         List globalMessages = (List)edlContext.getRequestParser().getAttribute(RequestParser.GLOBAL_MESSAGES_KEY);

                         Map<String, String> globalFieldErrors = (Map)edlContext.getRequestParser().getAttribute(RequestParser.GLOBAL_FIELD_ERRORS_KEY);

                         EDLXmlUtils.addErrorsAndMessagesToDocument(dom, globalErrors, globalMessages, globalFieldErrors);

             if (LOG.isDebugEnabled()) {

                     LOG.debug("Transforming dom " + XmlJotter.jotNode(dom, true));

             }

                 } catch (Exception e) {

                         throw new WorkflowRuntimeException(e);

                 }

         }

     public static List<String> determineValidActions(WorkflowDocument wfdoc) throws WorkflowException {

         String[] flags = new String[10];

         List<String> list = new ArrayList<String>();

         if (wfdoc == null) {

             list.add(UserAction.ACTION_CREATE);

             return list;

         }

         if (wfdoc.isAcknowledgeRequested()) {

             flags[buttons.ACKNOWLEDGE.ordinal()] = UserAction.ACTION_ACKNOWLEDGE;

         }

         if (wfdoc.isApprovalRequested()) {

             if (wfdoc.isBlanketApproveCapable()) {

                 flags[buttons.BLANKETAPPROVE.ordinal()] = UserAction.ACTION_BLANKETAPPROVE;

             }

             if (!wfdoc.isSaved()) {

                 flags[buttons.APPROVE.ordinal()] = UserAction.ACTION_APPROVE;

                 flags[buttons.DISAPPROVE.ordinal()] = UserAction.ACTION_DISAPPROVE;

             }

             // should invoke WorkflowDocument.saveRoutingData(...).

             flags[buttons.SAVE.ordinal()] = UserAction.ACTION_SAVE;

             if (wfdoc.getPreviousNodeNames().size() > 0) {

                 flags[buttons.RETURNTOPREVIOUS.ordinal()] = UserAction.ACTION_RETURN_TO_PREVIOUS;

             }

         }

         // this will never happen, but left code in case this gets figured out later

         // if allowed to execute save/approve and complete will both show

         else if (wfdoc.isCompletionRequested()) {

             flags[buttons.COMPLETE.ordinal()] = UserAction.ACTION_COMPLETE;

             if (wfdoc.isBlanketApproveCapable()) {

                 flags[buttons.BLANKETAPPROVE.ordinal()] = UserAction.ACTION_BLANKETAPPROVE;

             }

         }

         if (wfdoc.isFYIRequested()) {

             flags[buttons.FYI.ordinal()] = UserAction.ACTION_FYI;

         }

         if (wfdoc.isRouteCapable()) {

             flags[buttons.ROUTE.ordinal()] = UserAction.ACTION_ROUTE;

             if (wfdoc.isBlanketApproveCapable()) {

                 flags[buttons.BLANKETAPPROVE.ordinal()] = UserAction.ACTION_BLANKETAPPROVE;

             }

         }

         if (wfdoc.isApprovalRequested() || wfdoc.isRouteCapable()) {

             flags[buttons.SAVE.ordinal()] = UserAction.ACTION_SAVE;

         }

         if (wfdoc.isCompletionRequested() || wfdoc.isRouteCapable()) {

             flags[buttons.CANCEL.ordinal()] = UserAction.ACTION_CANCEL;

         }

         for (int i = 0; i < flags.length; i++) {

             if (flags[i] != null) {

                 list.add(flags[i]);

             }

         }

         return list;

     }

         public static boolean isEditable(EDLContext edlContext, List actions) {

             boolean editable = false;

             editable = listContainsItems(actions, UserAction.EDITABLE_ACTIONS);

             // reset editable flag to true if edoclite specifies <param name="alwaysEditable">true</param>

             Document edlDom = EdlServiceLocator.getEDocLiteService().getDefinitionXml(edlContext.getEdocLiteAssociation());

             // use xpath to check for attribute value on Config param element.

             XPath xpath = XPathFactory.newInstance().newXPath();

             String xpathExpression = "//config/param[@name='alwaysEditable']"; 

             try {

                 String match = (String) xpath.evaluate(xpathExpression, edlDom, XPathConstants.STRING);

                 if (!StringUtils.isBlank(match) && match.equals("true")) {

                     return true;

                 }

             } catch (XPathExpressionException e) {

                 throw new WorkflowRuntimeException("Unable to evaluate xpath expression " + xpathExpression, e);

                 }

             return editable;

         }

     public static void addActions(Document dom, Element documentState, List actions) {

         Element actionsPossible = EDLXmlUtils.getOrCreateChildElement(documentState, "actionsPossible", true);

         Iterator it = actions.iterator();

         while (it.hasNext()) {

             String action = it.next().toString();

             Element actionElement = dom.createElement(action);

             // if we use string.xsl we can avoid doing this here

             // (unless for some reason we decide we want different titles)

             if (!Character.isUpperCase(action.charAt(0))) {

                 StringBuffer sb = new StringBuffer(action);

                 sb.setCharAt(0, Character.toUpperCase(sb.charAt(0)));

                 action = sb.toString();

             }

             actionElement.setAttribute("title", action);

             actionsPossible.appendChild(actionElement);

         }

         Element annotatable = EDLXmlUtils.getOrCreateChildElement(documentState, "annotatable", true);

         annotatable.appendChild(dom.createTextNode(String.valueOf(isAnnotatable(actions))));

     }

     public static boolean listContainsItems(List list, Object[] items) {

         for (int i = 0; i < items.length; i++) {

             if (list.contains(items[i])) return true;

         }

         return false;

     }

     /**

      * Determines whether to display the annotation text box

      * Currently we will show the annotation box if ANY of the possible actions are

      * annotatable.

      * But what happens if we have an un-annotatable action?

      * Hey, why don't we just make all actions annotatable.

      * @param actions list of possible actions

      * @return whether to show the annotation text box

      */

     public static boolean isAnnotatable(List actions) {

         return listContainsItems(actions, UserAction.ANNOTATABLE_ACTIONS);

     }

 }