/*
 * Copyright  1999-2004 The Apache Software Foundation.
 *
 *  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.apache.savan.publication.client;

import java.net.URI;
import java.net.URL;
import java.util.Iterator;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.axiom.soap.SOAPFactory;
import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.OperationClient;
import org.apache.axis2.client.Options;
import org.apache.axis2.client.ServiceClient;
import org.apache.axis2.context.ConfigurationContext;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.description.AxisOperation;
import org.apache.axis2.description.AxisService;
import org.apache.axis2.description.Parameter;
import org.apache.savan.SavanConstants;
import org.apache.savan.SavanException;
import org.apache.savan.publication.PublicationReport;
import org.apache.savan.storage.SubscriberStore;
import org.apache.savan.subscribers.Subscriber;
import org.apache.savan.subscribers.SubscriberGroup;
import org.apache.savan.util.CommonUtil;

/**
 * This can be used to make the Publication Process easy.
 * Handle things like engaging the savan module correctly and setting the
 * correct subscriber store.
 */
public class PublicationClient {
	
	public static final String TEMP_PUBLICATION_ACTION = "UUID:TempPublicationAction";
	private ConfigurationContext configurationContext = null;
	
	public PublicationClient (ConfigurationContext configurationContext) {
		this.configurationContext = configurationContext;
	}

	/**
	 * This can be used by the Publishers in the same JVM (e.g. a service deployed in the same Axis2 instance).
	 * 
	 * @param eventData - The XML message to be published
	 * @param service - The service to which this publication is bound to (i.e. this will be only sent to the subscribers of this service)
	 * @param eventName - The name of the event, this can be a action which represents an out only operation or a Topic ID.
	 * 
	 * @throws SavanException
	 */
	public void sendPublication (OMElement eventData, AxisService service, URI eventName) throws SavanException {
		
		try {
			
			SubscriberStore subscriberStore = CommonUtil.getSubscriberStore(service);
			if (subscriberStore==null)
				throw new SavanException ("Cannot find the Subscriber Store");
				
			PublicationReport report = new PublicationReport();
			if (eventName!=null) {
				//there should be a valid operation or a SubscriberGroup to match this event.
				AxisOperation operation = getAxisOperationFromEventName (eventName);
				if (operation!=null) {
					//send to all subscribers with this operation.
					throw new UnsupportedOperationException ("Not implemented");
				} else {
					//there should be a valid SubscriberGroup to match this eventName
					
					String groupId = eventName.toString();
					SubscriberGroup group = (SubscriberGroup) subscriberStore.getSubscriberGroup(groupId);
					if (group!=null)
						group.sendEventDataToGroup(eventData);
					else
						throw new SavanException ("Could not find a subscriberGroup or an operation to match the eventName");

				}
			} else {
				//no event name, so send it to everybody.
			
				//sending to all individual subscribers
				for (Iterator iter = subscriberStore.retrieveAllSubscribers();iter.hasNext();){
					Subscriber subscriber = (Subscriber) iter.next();
					subscriber.sendEventData(eventData);
				}
				
				//sending to all Subscriber Groups
				for (Iterator iter = subscriberStore.retrieveAllSubscriberGroups();iter.hasNext();){
					SubscriberGroup subscriberGroup = (SubscriberGroup) iter.next();
					subscriberGroup.sendEventDataToGroup(eventData);
				}			
			}
			
		} catch (AxisFault e) {
			String message = "Could not send the publication";
			throw new SavanException (message,e);
		}
	}
	
	private AxisOperation getAxisOperationFromEventName (URI eventName) {
		//TODO do operation lookup
		return null;
	}
	
}