/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.cxf.wsn;

import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.jws.Oneway;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebResult;
import javax.jws.WebService;
import javax.management.ObjectName;
import javax.xml.namespace.QName;
import javax.xml.ws.wsaddressing.W3CEndpointReference;

import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.wsn.util.IdGenerator;
import org.apache.cxf.wsn.util.WSNHelper;
import org.oasis_open.docs.wsn.b_2.GetCurrentMessage;
import org.oasis_open.docs.wsn.b_2.GetCurrentMessageResponse;
import org.oasis_open.docs.wsn.b_2.NoCurrentMessageOnTopicFaultType;
import org.oasis_open.docs.wsn.b_2.NotificationMessageHolderType;
import org.oasis_open.docs.wsn.b_2.Notify;
import org.oasis_open.docs.wsn.b_2.Subscribe;
import org.oasis_open.docs.wsn.b_2.SubscribeCreationFailedFaultType;
import org.oasis_open.docs.wsn.b_2.SubscribeResponse;
import org.oasis_open.docs.wsn.br_2.PublisherRegistrationFailedFaultType;
import org.oasis_open.docs.wsn.br_2.RegisterPublisher;
import org.oasis_open.docs.wsn.br_2.RegisterPublisherResponse;
import org.oasis_open.docs.wsn.brw_2.NotificationBroker;
import org.oasis_open.docs.wsn.brw_2.PublisherRegistrationFailedFault;
import org.oasis_open.docs.wsn.brw_2.PublisherRegistrationRejectedFault;
import org.oasis_open.docs.wsn.brw_2.ResourceNotDestroyedFault;
import org.oasis_open.docs.wsn.bw_2.InvalidFilterFault;
import org.oasis_open.docs.wsn.bw_2.InvalidMessageContentExpressionFault;
import org.oasis_open.docs.wsn.bw_2.InvalidProducerPropertiesExpressionFault;
import org.oasis_open.docs.wsn.bw_2.InvalidTopicExpressionFault;
import org.oasis_open.docs.wsn.bw_2.MultipleTopicsSpecifiedFault;
import org.oasis_open.docs.wsn.bw_2.NoCurrentMessageOnTopicFault;
import org.oasis_open.docs.wsn.bw_2.SubscribeCreationFailedFault;
import org.oasis_open.docs.wsn.bw_2.TopicExpressionDialectUnknownFault;
import org.oasis_open.docs.wsn.bw_2.TopicNotSupportedFault;
import org.oasis_open.docs.wsn.bw_2.UnableToDestroySubscriptionFault;
import org.oasis_open.docs.wsn.bw_2.UnacceptableInitialTerminationTimeFault;
import org.oasis_open.docs.wsn.bw_2.UnrecognizedPolicyRequestFault;
import org.oasis_open.docs.wsn.bw_2.UnsupportedPolicyRequestFault;
import org.oasis_open.docs.wsrf.rp_2.GetResourcePropertyResponse;
import org.oasis_open.docs.wsrf.rp_2.InvalidResourcePropertyQNameFaultType;
import org.oasis_open.docs.wsrf.rpw_2.GetResourceProperty;
import org.oasis_open.docs.wsrf.rpw_2.InvalidResourcePropertyQNameFault;
import org.oasis_open.docs.wsrf.rw_2.ResourceUnavailableFault;
import org.oasis_open.docs.wsrf.rw_2.ResourceUnknownFault;

@WebService(endpointInterface = "org.oasis_open.docs.wsn.brw_2.NotificationBroker")
public abstract class AbstractNotificationBroker extends AbstractEndpoint
    implements NotificationBroker, NotificationBrokerMBean, GetResourceProperty {

    public static final String NAMESPACE_URI = "http://docs.oasis-open.org/wsn/b-2";
    public static final String PREFIX = "wsnt";
    public static final QName TOPIC_EXPRESSION_QNAME = new QName(NAMESPACE_URI, "TopicExpression", PREFIX);
    public static final QName FIXED_TOPIC_SET_QNAME = new QName(NAMESPACE_URI, "FixedTopicSet", PREFIX);
    public static final QName TOPIC_EXPRESSION_DIALECT_QNAME
        = new QName(NAMESPACE_URI, "TopicExpressionDialect", PREFIX);
    public static final QName TOPIC_SET_QNAME = new QName(NAMESPACE_URI, "TopicSet", PREFIX);

    private static final Logger LOGGER = LogUtils.getL7dLogger(AbstractNotificationBroker.class);

    private IdGenerator idGenerator;

    private AbstractPublisher anonymousPublisher;

    private Map<String, AbstractPublisher> publishers;

    private List<AbstractPublisher> nonContactPublishers;

    private Map<String, AbstractSubscription> subscriptions;

    public AbstractNotificationBroker(String name) {
        super(name);
        idGenerator = new IdGenerator();
        subscriptions = new ConcurrentHashMap<>();
        publishers = new ConcurrentHashMap<>();
        nonContactPublishers = new CopyOnWriteArrayList<>();
    }

    @Override
    public ObjectName getMBeanName() {
        try {
            return new ObjectName("org.apache.cxf.service.wsn:type=WSNotificationBroker");
        } catch (Exception e) {
            return null;
        }
    }

    public void init() throws Exception {
        register();
        anonymousPublisher = createPublisher("AnonymousPublisher");
        anonymousPublisher.setAddress(new URI(getAddress()).resolve(anonymousPublisher.getName()).toString());
        anonymousPublisher.register();
    }

    public void destroy() throws Exception {
        anonymousPublisher.destroy();
        unregister();
    }

    public List<String> getPublisher() {
        return new ArrayList<>(publishers.keySet());
    }

    public List<String> getSubscriptions() {
        return new ArrayList<>(subscriptions.keySet());
    }

    public EndpointMBean getPublisher(String name) {
        return publishers.get(name);
    }

    public EndpointMBean getSubscription(String name) {
        return subscriptions.get(name);
    }

    public EndpointMBean getAnonymousPublisher() {
        return anonymousPublisher;
    }

    /**
     *
     * @param notify
     */
    @WebMethod(operationName = "Notify")
    @Oneway
    public void notify(
            @WebParam(name = "Notify",
                      targetNamespace = "http://docs.oasis-open.org/wsn/b-1",
                      partName = "Notify")
            Notify notify) {

        LOGGER.finest("Notify");
        handleNotify(notify);
    }

    protected void handleNotify(Notify notify) {
        for (NotificationMessageHolderType messageHolder : notify.getNotificationMessage()) {
            W3CEndpointReference producerReference = messageHolder.getProducerReference();
            AbstractPublisher publisher = getPublisher(producerReference);
            if (publisher != null) {
                publisher.notify(messageHolder);
            }
        }
    }

    protected AbstractPublisher getPublisher(W3CEndpointReference producerReference) {
        AbstractPublisher publisher = null;
        if (producerReference != null) {
            String address = WSNHelper.getInstance().getWSAAddress(producerReference);
            publisher = publishers.get(address);
        }
        if (publisher == null) {
            publisher = anonymousPublisher;
        }
        return publisher;
    }

    /**
     *
     * @param subscribeRequest
     * @return returns org.oasis_open.docs.wsn.b_1.SubscribeResponse
     * @throws SubscribeCreationFailedFault
     * @throws InvalidTopicExpressionFault
     * @throws TopicNotSupportedFault
     * @throws InvalidFilterFault
     * @throws InvalidProducerPropertiesExpressionFault
     * @throws ResourceUnknownFault
     * @throws InvalidMessageContentExpressionFault
     * @throws TopicExpressionDialectUnknownFault
     * @throws UnacceptableInitialTerminationTimeFault
     */
    @WebMethod(operationName = "Subscribe")
    @WebResult(name = "SubscribeResponse",
               targetNamespace = "http://docs.oasis-open.org/wsn/b-1",
               partName = "SubscribeResponse")
    public SubscribeResponse subscribe(
            @WebParam(name = "Subscribe",
                      targetNamespace = "http://docs.oasis-open.org/wsn/b-1",
                      partName = "SubscribeRequest")
            Subscribe subscribeRequest)
        //CHECKSTYLE:OFF - WS-Notification spec throws a lot of faults
        throws InvalidFilterFault, InvalidMessageContentExpressionFault,
            InvalidProducerPropertiesExpressionFault, InvalidTopicExpressionFault, ResourceUnknownFault,
            SubscribeCreationFailedFault, TopicExpressionDialectUnknownFault, TopicNotSupportedFault,
            UnacceptableInitialTerminationTimeFault, UnsupportedPolicyRequestFault,
            UnrecognizedPolicyRequestFault {
        //CHECKSTYLE:ON

        LOGGER.finest("Subscribe");
        return handleSubscribe(subscribeRequest, null);
    }

    public SubscribeResponse handleSubscribe(
                Subscribe subscribeRequest,
                EndpointManager manager)
        //CHECKSTYLE:OFF - WS-Notification spec throws a lot of faults
        throws InvalidFilterFault, InvalidMessageContentExpressionFault,
            InvalidProducerPropertiesExpressionFault, InvalidTopicExpressionFault,
            SubscribeCreationFailedFault, TopicExpressionDialectUnknownFault,
            TopicNotSupportedFault, UnacceptableInitialTerminationTimeFault,
            UnsupportedPolicyRequestFault, UnrecognizedPolicyRequestFault {
        //CHECKSTYLE:ON
        AbstractSubscription subscription = null;
        boolean success = false;
        try {
            subscription = createSubscription(idGenerator.generateSanitizedId());
            subscription.setBroker(this);
            subscriptions.put(subscription.getAddress(), subscription);
            subscription.create(subscribeRequest);
            if (manager != null) {
                subscription.setManager(manager);
            }
            subscription.register();
            SubscribeResponse response = new SubscribeResponse();
            response.setSubscriptionReference(subscription.getEpr());
            success = true;
            return response;
        } catch (EndpointRegistrationException e) {
            LOGGER.log(Level.WARNING, "Unable to register new endpoint", e);
            SubscribeCreationFailedFaultType fault = new SubscribeCreationFailedFaultType();
            throw new SubscribeCreationFailedFault("Unable to register new endpoint", fault, e);
        } finally {
            if (!success && subscription != null) {
                if (subscription.getAddress() != null) {
                    subscriptions.remove(subscription.getAddress());
                }
                try {
                    subscription.unsubscribe();
                } catch (UnableToDestroySubscriptionFault e) {
                    LOGGER.log(Level.INFO, "Error destroying subscription", e);
                }
            }
        }
    }

    public void unsubscribe(String address) throws UnableToDestroySubscriptionFault {
        AbstractSubscription subscription = subscriptions.remove(address);
        if (subscription != null) {
            subscription.unsubscribe();
        }
    }

    /**
     *
     * @param getCurrentMessageRequest
     * @return returns org.oasis_open.docs.wsn.b_1.GetCurrentMessageResponse
     * @throws MultipleTopicsSpecifiedFault
     * @throws TopicNotSupportedFault
     * @throws InvalidTopicExpressionFault
     * @throws ResourceUnknownFault
     * @throws TopicExpressionDialectUnknownFault
     * @throws NoCurrentMessageOnTopicFault
     */
    @WebMethod(operationName = "GetCurrentMessage")
    @WebResult(name = "GetCurrentMessageResponse",
               targetNamespace = "http://docs.oasis-open.org/wsn/b-1",
               partName = "GetCurrentMessageResponse")
    public GetCurrentMessageResponse getCurrentMessage(
            @WebParam(name = "GetCurrentMessage",
                      targetNamespace = "http://docs.oasis-open.org/wsn/b-1",
                      partName = "GetCurrentMessageRequest")
            GetCurrentMessage getCurrentMessageRequest)
        //CHECKSTYLE:OFF - WS-Notification spec throws a lot of faults
        throws InvalidTopicExpressionFault,
            MultipleTopicsSpecifiedFault, NoCurrentMessageOnTopicFault, ResourceUnknownFault,
            TopicExpressionDialectUnknownFault, TopicNotSupportedFault {
        //CHECKSTYLE:ON
        LOGGER.finest("GetCurrentMessage");
        NoCurrentMessageOnTopicFaultType fault = new NoCurrentMessageOnTopicFaultType();
        throw new NoCurrentMessageOnTopicFault("There is no current message on this topic.", fault);
    }

    /**
     *
     * @param registerPublisherRequest
     * @return returns org.oasis_open.docs.wsn.br_1.RegisterPublisherResponse
     * @throws PublisherRegistrationRejectedFault
     * @throws InvalidTopicExpressionFault
     * @throws TopicNotSupportedFault
     * @throws ResourceUnknownFault
     * @throws PublisherRegistrationFailedFault
     */
    @WebMethod(operationName = "RegisterPublisher")
    @WebResult(name = "RegisterPublisherResponse",
               targetNamespace = "http://docs.oasis-open.org/wsn/br-1",
               partName = "RegisterPublisherResponse")
    public RegisterPublisherResponse registerPublisher(
            @WebParam(name = "RegisterPublisher",
                      targetNamespace = "http://docs.oasis-open.org/wsn/br-1",
                      partName = "RegisterPublisherRequest")
            RegisterPublisher registerPublisherRequest) throws InvalidTopicExpressionFault,
            PublisherRegistrationFailedFault, PublisherRegistrationRejectedFault, ResourceUnknownFault,
            TopicNotSupportedFault {

        LOGGER.finest("RegisterPublisher");
        return handleRegisterPublisher(registerPublisherRequest);
    }

    public RegisterPublisherResponse handleRegisterPublisher(RegisterPublisher registerPublisherRequest)
        throws InvalidTopicExpressionFault, PublisherRegistrationFailedFault,
        PublisherRegistrationRejectedFault, ResourceUnknownFault, TopicNotSupportedFault {

        AbstractPublisher publisher = null;
        boolean success = false;
        try {
            publisher = createPublisher(idGenerator.generateSanitizedId());
            publisher.register();
            publisher.create(registerPublisherRequest);
            RegisterPublisherResponse response = new RegisterPublisherResponse();
            response.setPublisherRegistrationReference(publisher.getEpr());
            if (publisher.getPublisherReference() != null) {
                publishers.put(WSNHelper.getInstance()
                                   .getWSAAddress(publisher.getPublisherReference()),
                               publisher);
            } else {
                nonContactPublishers.add(publisher);
            }
            success = true;
            return response;
        } catch (EndpointRegistrationException e) {
            LOGGER.log(Level.WARNING, "Unable to register new endpoint", e);
            PublisherRegistrationFailedFaultType fault = new PublisherRegistrationFailedFaultType();
            throw new PublisherRegistrationFailedFault("Unable to register new endpoint", fault, e);
        } finally {
            if (!success && publisher != null) {
                try {
                    publisher.destroy();
                } catch (ResourceNotDestroyedFault e) {
                    LOGGER.log(Level.INFO, "Error destroying publisher", e);
                }
            }
        }
    }

    protected abstract AbstractPublisher createPublisher(String name);

    protected abstract AbstractSubscription createSubscription(String name);

    @WebResult(name = "GetResourcePropertyResponse",
               targetNamespace = "http://docs.oasis-open.org/wsrf/rp-2",
               partName = "GetResourcePropertyResponse")
    @WebMethod(operationName = "GetResourceProperty")
    public GetResourcePropertyResponse getResourceProperty(
        @WebParam(partName = "GetResourcePropertyRequest",
                  name = "GetResourceProperty",
                  targetNamespace = "http://docs.oasis-open.org/wsrf/rp-2")
        javax.xml.namespace.QName getResourcePropertyRequest
    ) throws ResourceUnavailableFault, ResourceUnknownFault, InvalidResourcePropertyQNameFault {

        LOGGER.finest("GetResourceProperty");
        return handleGetResourceProperty(getResourcePropertyRequest);
    }

    protected GetResourcePropertyResponse handleGetResourceProperty(QName property)
        throws ResourceUnavailableFault, ResourceUnknownFault, InvalidResourcePropertyQNameFault {
        InvalidResourcePropertyQNameFaultType fault = new InvalidResourcePropertyQNameFaultType();
        throw new InvalidResourcePropertyQNameFault("Invalid resource property QName: " + property, fault);
    }

}
