/*

  * 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.core.web.impex;

 import org.apache.commons.lang.exception.ExceptionUtils;

 import org.apache.log4j.Logger;

 import org.apache.struts.action.ActionForm;

 import org.apache.struts.action.ActionForward;

 import org.apache.struts.action.ActionMapping;

 import org.apache.struts.upload.FormFile;

 import org.kuali.rice.core.api.impex.xml.CompositeXmlDocCollection;

 import org.kuali.rice.core.api.impex.xml.FileXmlDocCollection;

 import org.kuali.rice.core.api.impex.xml.XmlDoc;

 import org.kuali.rice.core.api.impex.xml.XmlDocCollection;

 import org.kuali.rice.core.api.impex.xml.ZipXmlDocCollection;

 import org.kuali.rice.core.api.services.CoreApiServiceLocator;

 import org.kuali.rice.core.xml.dto.AttributeSet;

 import org.kuali.rice.kim.service.KIMServiceLocator;

 import org.kuali.rice.kim.util.KimConstants;

 import org.kuali.rice.kns.exception.AuthorizationException;

 import org.kuali.rice.kns.util.GlobalVariables;

 import org.kuali.rice.kns.util.KNSConstants;

 import org.kuali.rice.kns.util.KNSUtils;

 import org.kuali.rice.kns.web.struts.action.KualiAction;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.File;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.List;

 /**

  * Struts action that accepts uploaded files and feeds them to the XmlIngesterService

  * @see org.kuali.rice.kew.batch.XmlIngesterService

  * @see org.kuali.rice.core.web.impex.IngesterForm

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

  */

 public class IngesterAction extends KualiAction {

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

     @Override

         public ActionForward execute(

             ActionMapping mapping,

             ActionForm form,

             HttpServletRequest request,

             HttpServletResponse response)

             throws Exception {

             checkAuthorization(form, "");

         LOG.debug(request.getMethod());

         if (!"post".equals(request.getMethod().toLowerCase())) {

             LOG.debug("returning to view");

             return mapping.findForward("view");

         }

         IngesterForm iform = (IngesterForm) form;

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

         List<File> tempFiles = new ArrayList<File>();

         try {

             Collection<FormFile> files = iform.getFiles();

             List<XmlDocCollection> collections = new ArrayList<XmlDocCollection>(files.size());

             LOG.debug(files);

             LOG.debug("" + files.size());

             for (FormFile file1 : files)

             {

                 if (file1.getFileName() == null || file1.getFileName().length() == 0) {

                                         continue;

                                 }

                 if (file1.getFileData() == null)

                 {

                     messages.add("File '" + file1.getFileName() + "' contained no data");

                     continue;

                 }

                 LOG.debug("Processing file: " + file1.getFileName());

                 // ok, we have to copy it to *another* file because Struts doesn't give us a File

                 // reference (which itself is not a bad abstraction) and XmlDocs based on ZipFile

                 // can't be constructed without a file reference.

                 FileOutputStream fos = null;

                 File temp = null;

                 try

                 {

                     temp = File.createTempFile("ingester", null);

                     tempFiles.add(temp);

                     fos = new FileOutputStream(temp);

                     fos.write(file1.getFileData());

                 } catch (IOException ioe)

                 {

                     messages.add("Error copying file data for '" + file1.getFileName() + "': " + ioe);

                     continue;

                 } finally

                 {

                     if (fos != null) {

                                                 try

                                                 {

                                                     fos.close();

                                                 } catch (IOException ioe)

                                                 {

                                                     LOG.error("Error closing temp file output stream: " + temp, ioe);

                                                 }

                                         }

                 }

                 if (file1.getFileName().toLowerCase().endsWith(".zip"))

                 {

                     try

                     {

                         collections.add(new ZipXmlDocCollection(temp));

                     } catch (IOException ioe)

                     {

                         String message = "Unable to load file: " + file1;

                         LOG.error(message);

                         messages.add(message);

                     }

                 } else if (file1.getFileName().endsWith(".xml"))

                 {

                     collections.add(new FileXmlDocCollection(temp, file1.getFileName()));

                 } else

                 {

                     messages.add("Ignoring extraneous file: " + file1.getFileName());

                 }

             }

             if (collections.size() == 0) {

                 String message = "No valid files to ingest";

                 LOG.debug(message);

                 messages.add(message);

             } else {

                 // wrap in composite collection to make transactional

                 CompositeXmlDocCollection compositeCollection = new CompositeXmlDocCollection(collections);

                 int totalProcessed = 0;

                 List<XmlDocCollection> c = new ArrayList<XmlDocCollection>(1);

                 c.add(compositeCollection);

                 try {

                     Collection<XmlDocCollection> failed = CoreApiServiceLocator.getXmlIngesterService().ingest(c, GlobalVariables.getUserSession().getPrincipalId());

                     boolean txFailed = failed.size() > 0;

                     if (txFailed) {

                         messages.add("Ingestion failed");

                     }

                     for (XmlDocCollection collection1 : collections)

                     {

                         List<? extends XmlDoc> docs = collection1.getXmlDocs();

                         for (XmlDoc doc1 : docs)

                         {

                             if (doc1.isProcessed())

                             {

                                 if (!txFailed)

                                 {

                                     totalProcessed++;

                                     messages.add("Ingested xml doc: " + doc1.getName() + (doc1.getProcessingMessage() == null ? "" : "\n" + doc1.getProcessingMessage()));

                                 } else

                                 {

                                     messages.add("Rolled back doc: " + doc1.getName() + (doc1.getProcessingMessage() == null ? "" : "\n" + doc1.getProcessingMessage()));

                                 }

                             } else

                             {

                                 messages.add("Failed to ingest xml doc: " + doc1.getName() + (doc1.getProcessingMessage() == null ? "" : "\n" + doc1.getProcessingMessage()));

                             }

                         }

                     }

                 } catch (Exception e) {

                     String message = "Error during ingest";

                     LOG.error(message, e);

                     messages.add(message + ": " + e  + ":\n" + ExceptionUtils.getFullStackTrace(e));

                 }

                 if (totalProcessed == 0) {

                     String message = "No xml docs ingested";

                     LOG.debug(message);

                     messages.add(message);

                 }

             }

         } finally {

             if (tempFiles.size() > 0) {

                 for (File tempFile : tempFiles)

                 {

                     if (!tempFile.delete())

                     {

                         LOG.warn("Error deleting temp file: " + tempFile);

                     }

                 }

             }

         }

         request.setAttribute("messages", messages);

         return mapping.findForward("view");

     }

     @Override

         protected void checkAuthorization( ActionForm form, String methodToCall) throws AuthorizationException

     {

             String principalId = GlobalVariables.getUserSession().getPrincipalId();

             AttributeSet roleQualifier = new AttributeSet();

             AttributeSet permissionDetails = KNSUtils.getNamespaceAndActionClass(this.getClass());

         if (!KIMServiceLocator.getIdentityManagementService().isAuthorizedByTemplateName(principalId, KNSConstants.KNS_NAMESPACE,

                         KimConstants.PermissionTemplateNames.USE_SCREEN, permissionDetails, roleQualifier ))

         {

             throw new AuthorizationException(GlobalVariables.getUserSession().getPrincipalName(),

                             methodToCall,

                             this.getClass().getSimpleName());

         }

     }

 }