/*
    * SymmetricDS is an open source database synchronization solution.
    *   
    * Copyright (C) Chris Henson <chenson42@users.sourceforge.net>
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 3 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, see
   * <http://www.gnu.org/licenses/>.
   */
  
  package org.jumpmind.symmetric.transport.internal;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.PipedInputStream;
  import java.io.PipedOutputStream;
  import java.io.PrintWriter;
  import java.util.List;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.jumpmind.symmetric.SymmetricEngine;
  import org.jumpmind.symmetric.common.Constants;
  import org.jumpmind.symmetric.model.BatchInfo;
  import org.jumpmind.symmetric.model.IncomingBatchHistory;
  import org.jumpmind.symmetric.model.Node;
  import org.jumpmind.symmetric.model.NodeSecurity;
  import org.jumpmind.symmetric.service.IAcknowledgeService;
  import org.jumpmind.symmetric.service.IDataExtractorService;
  import org.jumpmind.symmetric.service.IDataLoaderService;
  import org.jumpmind.symmetric.service.IDataService;
  import org.jumpmind.symmetric.service.INodeService;
  import org.jumpmind.symmetric.service.IParameterService;
  import org.jumpmind.symmetric.service.IRegistrationService;
  import org.jumpmind.symmetric.transport.AbstractTransportManager;
  import org.jumpmind.symmetric.transport.IIncomingTransport;
  import org.jumpmind.symmetric.transport.IOutgoingTransport;
  import org.jumpmind.symmetric.transport.IOutgoingWithResponseTransport;
  import org.jumpmind.symmetric.transport.ITransportManager;
  import org.springframework.beans.factory.BeanFactory;
  
  /***
   * Coordinates interaction between two symmetric engines in the same JVM.
   */
  public class InternalTransportManager extends AbstractTransportManager implements ITransportManager {
  
      static final Log logger = LogFactory.getLog(InternalTransportManager.class);
  
      private IParameterService parameterServer;
  
      private INodeService nodeService;
  
      public InternalTransportManager(INodeService nodeService, IParameterService config) {
          this.parameterServer = config;
          this.nodeService = nodeService;
      }
  
      public IIncomingTransport getPullTransport(final Node remote, final Node local) throws IOException {
          final PipedOutputStream respOs = new PipedOutputStream();
          final PipedInputStream respIs = new PipedInputStream(respOs);
  
          runAtClient(remote.getSyncURL(), null, respOs, new IClientRunnable() {
              public void run(BeanFactory factory, InputStream is, OutputStream os) throws Exception {
                  // TODO this is duplicated from the Pull Servlet. It should be
                  // consolidated somehow!
                  INodeService nodeService = (INodeService) factory.getBean(Constants.NODE_SERVICE);
                  NodeSecurity security = nodeService.findNodeSecurity(local.getNodeId());
                  if (security.isInitialLoadEnabled()) {
                      ((IDataService) factory.getBean(Constants.DATA_SERVICE)).insertReloadEvent(local);
                  }
                  IDataExtractorService extractor = (IDataExtractorService) factory
                          .getBean(Constants.DATAEXTRACTOR_SERVICE);
                  IOutgoingTransport transport = new InternalOutgoingTransport(respOs);
                  extractor.extract(local, transport);
                  transport.close();
              }
          });
          return new InternalIncomingTransport(respIs);
      }
  
      public IOutgoingWithResponseTransport getPushTransport(final Node remote, final Node local) throws IOException {
  
          final PipedOutputStream pushOs = new PipedOutputStream();
          final PipedInputStream pushIs = new PipedInputStream(pushOs);
  
          final PipedOutputStream respOs = new PipedOutputStream();
         final PipedInputStream respIs = new PipedInputStream(respOs);
 
         runAtClient(remote.getSyncURL(), pushIs, respOs, new IClientRunnable() {
             public void run(BeanFactory factory, InputStream is, OutputStream os) throws Exception {
                 // This should be basically what the push servlet does ...
                 IDataLoaderService service = (IDataLoaderService) factory.getBean(Constants.DATALOADER_SERVICE);
                 service.loadData(pushIs, respOs);
             }
         });
         return new InternalOutgoingWithResponseTransport(pushOs, respIs);
     }
 
     public IIncomingTransport getRegisterTransport(final Node client) throws IOException {
 
         final PipedOutputStream respOs = new PipedOutputStream();
         final PipedInputStream respIs = new PipedInputStream(respOs);
 
         runAtClient(parameterServer.getRegistrationUrl(), null, respOs, new IClientRunnable() {
             public void run(BeanFactory factory, InputStream is, OutputStream os) throws Exception {
                 // This should be basically what the registration servlet does
                 // ...
                 IRegistrationService service = (IRegistrationService) factory.getBean(Constants.REGISTRATION_SERVICE);
                 service.registerNode(client, os, false);
             }
         });
         return new InternalIncomingTransport(respIs);
     }
 
     public boolean sendAcknowledgement(Node remote, List<IncomingBatchHistory> list, Node local) throws IOException {
         try {
             if (list != null && list.size() > 0) {
                 SymmetricEngine remoteEngine = getTargetEngine(remote.getSyncURL());
 
                 String ackData = getAcknowledgementData(local.getNodeId(), list);
                 List<BatchInfo> batches = readAcknowledgement(ackData);
                 IAcknowledgeService service = (IAcknowledgeService) remoteEngine.getApplicationContext().getBean(
                         Constants.ACKNOWLEDGE_SERVICE);
                 for (BatchInfo batchInfo : batches) {
                     service.ack(batchInfo);
                 }
 
             }
             return true;
         } catch (Exception ex) {
             logger.error(ex, ex);
             return false;
         }
     }
 
     public void writeAcknowledgement(OutputStream out, List<IncomingBatchHistory> list) throws IOException {
         PrintWriter pw = new PrintWriter(new OutputStreamWriter(out, Constants.ENCODING), true);
         pw.println(getAcknowledgementData(nodeService.findIdentity().getNodeId(), list));
         pw.close();
     }
 
     private void runAtClient(final String url, final InputStream is, final OutputStream os,
             final IClientRunnable runnable) {
         new Thread() {
             public void run() {
                 try {
                     SymmetricEngine engine = getTargetEngine(url);
                     runnable.run(engine.getApplicationContext(), is, os);
                 } catch (Exception e) {
                     logger.error(e, e);
                 } finally {
                     IOUtils.closeQuietly(is);
                     IOUtils.closeQuietly(os);
                 }
             }
         }.start();
     }
 
     private SymmetricEngine getTargetEngine(String url) {
         SymmetricEngine engine = SymmetricEngine.findEngineByUrl(url);
         if (engine == null) {
             throw new NullPointerException("Could not find the engine reference for the following url: " + url);
         } else {
             return engine;
         }
     }
 
     interface IClientRunnable {
         public void run(BeanFactory factory, InputStream is, OutputStream os) throws Exception;
     }
 
 }