/**
    *    Copyright 2011 meltmedia
    *
    *    Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
    *
   *    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.xchain.namespaces.hibernate;
  
  import javax.xml.namespace.QName;
  
  import org.apache.commons.jxpath.JXPathContext;
  import org.hibernate.Session;
  import org.hibernate.Transaction;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.xchain.annotations.Attribute;
  import org.xchain.annotations.AttributeType;
  import org.xchain.annotations.Element;
  import org.xchain.framework.hibernate.HibernateLifecycle;
  import org.xchain.impl.ChainImpl;
  
  /**
   * @author Josh Kennedy
   */
  @Element(localName="debug-session")
  public abstract class DebugSessionCommand extends ChainImpl {
  	public static Logger log = LoggerFactory.getLogger(DebugSessionCommand.class);
  	
  	public boolean execute(JXPathContext context) throws Exception {
  		try {
  			Session session = null;
  		    Transaction transaction = null;
  	
  		    String message = getMessage(context);
  		    log.debug(message);
  		    // get the session from the context.
  		    QName name = getName(context);
  		    session = HibernateLifecycle.getCurrentSession(name);
  		    
  		    log.debug("Getting session for {}", name.toString());
  		    
  		    // if we didn't find the session, then bail out.
  		    if( session == null ) {
  		      throw new IllegalStateException("Session not found.");
  		    }
  		    
  		    // Dump Session data to log
  		    logSession(session);
  		    
  		    transaction = session.getTransaction();
  		    
  		    if (transaction != null) {
  		    	log.debug("Transaction Active: {}", transaction.isActive());
  		    }
  		}
  		catch (Exception e) {
  			log.error("Error inspecting Session: {}", e.getMessage(), e);
  		}
  	    
  		return false;
  	}
  	
  	private void logSession(Session session) {
  		log.debug("Connected, Dirty, Open:  {}", new boolean[]{session.isConnected(), session.isDirty(), session.isOpen()});
  		log.debug("CacheMode:  {}", session.getCacheMode().toString());
  		log.debug("EntityMode: {}", session.getEntityMode().toString());
  		log.debug("FlushMode:  {}", session.getFlushMode().toString());
  	}
  	
  	@Attribute(localName="name",
  	           type=AttributeType.QNAME,
  	           defaultValue= "{http://www.xchain.org/hibernate}session-factory")
  	public abstract QName getName(JXPathContext context);
  	
  	@Attribute(localName="message", type=AttributeType.ATTRIBUTE_VALUE_TEMPLATE, defaultValue="")
  	public abstract String getMessage(JXPathContext context);
  }