/**
    * This file Copyright (c) 2010-2013 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.module.groovy.console;
  
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.HierarchyManager;
  import info.magnolia.cms.util.HierarchyManagerUtil;
  import info.magnolia.cms.util.HierarchyManagerWrapper;
  import info.magnolia.context.Context;
  import info.magnolia.context.ContextDecorator;
  import info.magnolia.context.DefaultRepositoryStrategy;
  import info.magnolia.context.JCRSessionStrategy;
  import info.magnolia.context.SystemContext;
  import info.magnolia.context.SystemRepositoryStrategy;
  import info.magnolia.context.UserContext;
  import info.magnolia.jcr.RuntimeRepositoryException;
  import info.magnolia.jcr.wrapper.NodeWrappingDelegateSessionWrapper;
  import info.magnolia.module.groovy.support.nodes.MgnlGroovyJCRNode;
  import info.magnolia.module.groovy.support.nodes.MgnlGroovyNode;
  import info.magnolia.objectfactory.Components;
  import info.magnolia.repository.RepositoryManager;
  
  import java.io.Serializable;
  
  import javax.jcr.LoginException;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  
  /**
   * Custom context which returns a special version of {@link HierarchyManager} wrapping content as {@link MgnlGroovyNode}.
   * @author pbaerfuss
   * @version $Id$
   *
   */
  public class MgnlGroovyConsoleContext extends ContextDecorator {
  
      private static final class InternalHierarchyManagerWrapper extends
          HierarchyManagerWrapper {
          private InternalHierarchyManagerWrapper(HierarchyManager wrappedHM) {
              super(wrappedHM);
          }
  
          @Override
          protected Content wrap(Content content) {
              return new MgnlGroovyNode(content);
          }
      }
      
      private static final class InternalJCRSessionWrapper extends
      NodeWrappingDelegateSessionWrapper {
          private InternalJCRSessionWrapper(Session session) {
              super(session);
          }
      
          @Override
          protected Node wrapNode(Node node) {
              try {
                  return new MgnlGroovyJCRNode(node);
              } catch (RepositoryException e) {
                  return null;
              }
          }
  
      }
  
      //need this to avoid warning when setting strategy as session attribute in context
     private static final class SerializableRepositoryStrategy extends DefaultRepositoryStrategy implements Serializable {
         private static final long serialVersionUID = 1L;
 
         public SerializableRepositoryStrategy(UserContext context) {
             super(Components.getComponent(RepositoryManager.class), context);
         }
     }
 
     private static final long serialVersionUID = 1L;
 
     private static final String STRATEGY_ATTRIBUTE = MgnlGroovyConsole.class.getName() + ".strategy";
 
     public MgnlGroovyConsoleContext(Context ctx) {
         super(ctx);
     }
 
     @Override
     public JCRSessionStrategy getRepositoryStrategy() {
 
         JCRSessionStrategy strategy = (JCRSessionStrategy) getAttribute(STRATEGY_ATTRIBUTE, Context.SESSION_SCOPE);
         if (strategy == null) {
             //this is only needed by the the MgnlGroovyRescueServlet (that is in exceptional cases, when you're in dire straits)
             //as operations there are executed in SystemContext
             if(SystemContext.class.isAssignableFrom(ctx.getClass())){
                 strategy = new SystemRepositoryStrategy(Components.getComponent(RepositoryManager.class));
             } else {
                 strategy = new SerializableRepositoryStrategy((UserContext) ctx);
             }
             setAttribute(STRATEGY_ATTRIBUTE, strategy, Context.SESSION_SCOPE);
         }
         return strategy;
     }
 
     @Override
     public HierarchyManager getHierarchyManager(String workspaceName) {
         Session session;
         try {
             session = getRepositoryStrategy().getSession(workspaceName);
         } catch (RepositoryException e) {
             throw new RuntimeRepositoryException(e);
         }
         return new InternalHierarchyManagerWrapper(HierarchyManagerUtil.asHierarchyManager(session));
     }
 
     @Override
     public Session getJCRSession(String workspaceName) throws LoginException, RepositoryException {
         Session session;
         try {
             session = getRepositoryStrategy().getSession(workspaceName);
         } catch (RepositoryException e) {
             throw new RuntimeRepositoryException(e);
         }
         return new InternalJCRSessionWrapper(session);
     }
 }