package org.gcube.informationsystem.registry.impl.state;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;

import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.gcube.common.core.informationsystem.notifier.ISNotifier;
import org.gcube.common.core.informationsystem.publisher.ISPublisher;
import org.gcube.common.core.informationsystem.publisher.ISPublisherException;
import org.gcube.common.core.contexts.GHNContext;
import org.gcube.common.core.resources.GCUBEHostingNode;
import org.gcube.common.core.resources.GCUBEResource;
import org.gcube.common.core.resources.GCUBERunningInstance;
import org.gcube.common.core.resources.GCUBEService;
import org.gcube.common.core.state.GCUBEWSResource;
import org.gcube.common.core.utils.logging.GCUBELog;
import org.gcube.informationsystem.registry.impl.RegistryFactory;
import org.gcube.informationsystem.registry.impl.contexts.ProfileContext;
import org.gcube.informationsystem.registry.impl.contexts.ServiceContext;
import org.globus.wsrf.ResourceException;
import org.globus.wsrf.impl.SimpleTopic;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;


/**
 * @author Andrea Manzi
 * 
 */
public class ProfileResource extends GCUBEWSResource {

	private static GCUBELog logger = new GCUBELog(ProfileResource.class.getName());
	
	private ISPublisher publisher = null;
	
	private ISNotifier notifier= null;
	
	ArrayList<SimpleTopic> listQname = new ArrayList<SimpleTopic>();
	
	protected static final String NotificationProfileRP="NotificationProfile";
	
	protected GCUBEResource gCubeResource;
	
	protected static final String ProfileRP="Profile";
	
	@Override
	protected String[] getTopicNames(){
		return new String[] {NotificationProfileRP};
	}
	
	@Override
	protected String[] getPropertyNames(){
		return new String[] {ProfileRP};
	}

	 /**
	 *  Constructor
	 * @throws Exception Exception
	 */
	public ProfileResource() throws Exception{};

	
	/**
	 * initialize the resource
	 * @param params Object
	 */
	@Override
	public void initialise(Object... params) throws ResourceException {
		GCUBEResource resource = (GCUBEResource) params[0];
		logger.debug("initializing resource "+resource.getID());
		Document dom = null;
		StringWriter writer =new StringWriter();
		
		try {
			resource.store(writer);		
			
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			factory.setNamespaceAware(true);
			
			DocumentBuilder builder = factory.newDocumentBuilder();			
			 
			StringReader reader = new StringReader(writer.toString().substring(writer.toString().indexOf("?>")+2, writer.toString().length()));
			
			InputSource source = new InputSource(reader);
						
			dom =builder.parse(source); 
			
					    
		} catch (Exception e1) {
			throw new ResourceException(e1);
		}
		
		
		this.setProfile(dom);
		this.setNotificationProfile(dom);
		this.setGCubeResource(resource);
		
		
		
		if (hasToLive(resource)) this.setTerminationTime(null);
		
		if (hasToLive(resource)) {
			//registration of Topic To IS-Notifier
			
			listQname.add(new SimpleTopic(this.generateQName()));
			synchronized(RegistryFactory.notificationMap) {
				if (!(RegistryFactory.notificationMap.contains(this.getID()))) {
					try {
						notifier = GHNContext.getImplementation(ISNotifier.class);
						notifier.registerISNotification(this.getEPR(), listQname, ServiceContext.getContext());
						
					} catch (Exception e){ 	
						e.printStackTrace();
						throw new ResourceException(e);
					}
					
					RegistryFactory.notificationMap.add(this.getID());
				}
			}
		}
	
	}

	/**
	 * set notification Profile 
	 * 
	 * @param profile Document
	 */
	public  void setNotificationProfile(Document  profile) {
		this.getResourcePropertySet().get(NotificationProfileRP).clear();
		this.getResourcePropertySet().get(NotificationProfileRP).add(profile);
		//this.getPersistenceDelegate().store(this);
	}

	/**
	 * get notification Profile 
	 * 
	 * @return Document profile
	 */
	public  Document getNotificationProfile() {
		return  (Document)this.getResourcePropertySet().get(NotificationProfileRP).get(0);
	}
	

	/**
	 * set Profile 
	 * 
	 * @param profile Document
	 */
	public  void setProfile(Document  profile) {
		this.getResourcePropertySet().get(ProfileRP).clear();
		this.getResourcePropertySet().get(ProfileRP).add(profile);
		//this.getPersistenceDelegate().store(this);
	}

	/**
	 * get Profile 
	 * 
	 * @return Document profile
	 */
	public  Document getProfile() {
		return  (Document)this.getResourcePropertySet().get(ProfileRP).get(0);
	}
	
	

	/**
	 * Checks if the profile has to live or not
	 * 
	 * @param GCUBEReosurce resource
	 * @return true/false
	 */
	private boolean hasToLive(GCUBEResource resource) {
		if (resource.getType().compareTo(GCUBERunningInstance.TYPE)==0 ||
				resource.getType().compareTo(GCUBEHostingNode.TYPE)==0 ||
				resource.getType().compareTo(GCUBEService.TYPE)==0) return true;
		else return false;
	}
	
	/**
	 * Gets the Resource QName
	 * @return the Resource QName
	 */
	private QName generateQName() {
		return new QName(ProfileContext.getContext().getNamespace(), NotificationProfileRP+this.getID().getValue());
	}

	/**
	 * returns the Resource
	 * 
	 * @return resource GCUBEReosurce
	 */
	public GCUBEResource getGCubeResource() {
		return this.gCubeResource;
	}

    /**
     * sets the resource
     * @param resource GCUBEReosurce
     */
	public void setGCubeResource(GCUBEResource resource) {
		this.gCubeResource = resource;
	}
	
	@Override
	public void remove() throws ResourceException{
		super.remove();
		logger.info("Resource " + this.getID()+ " is going to be removed.");
		
		try {
			publisher = GHNContext.getImplementation(ISPublisher.class);
		} catch (Exception e) {
			e.printStackTrace();
		}
	

		if (RegistryFactory.notificationMap.contains(this.getID()))
		{
			try {
				
				notifier.unregisterISNotification(this.getEPR(),listQname,ServiceContext.getContext());
			} catch (ISPublisherException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}

			synchronized(RegistryFactory.notificationMap) {
				RegistryFactory.notificationMap.remove(this.getID());
			}
		}
		
		try {
			publisher.removeWSResource(this,ServiceContext.getContext().getScope());
		} catch (ISPublisherException e) {
			e.printStackTrace();
		}

	}
	
	
	/**
	 * updates the resource
	 * 
	 * @param resource
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public void updateResource(GCUBEResource resource) throws Exception{
		
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		factory.setNamespaceAware(true);
		DocumentBuilder builder = factory.newDocumentBuilder();
		StringWriter writer = new StringWriter();
		resource.store(writer);
		StringReader reader = new StringReader(writer.toString());
		InputSource source = new InputSource(reader);
		Document dom = builder.parse(source); 
		this.setProfile(dom);
		this.setGCubeResource(resource);
		// updates the notification profile too
		if (this.hasToLive(resource)) 
			this.setNotificationProfile(dom);
		
		this.getPersistenceDelegate().store(this);
	}


}