///*
// * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
// *
// * This program and the accompanying materials are made available under the
// * terms of the Eclipse Public License v1.0 which accompanies this distribution,
// * and is available at http://www.eclipse.org/legal/epl-v10.html
// */
//
//package org.opendaylight.controller.messagebus.eventsources.netconf;
//
//import static com.google.common.util.concurrent.Futures.immediateFuture;
//
//import java.io.IOException;
//import java.util.ArrayList;
//import java.util.Date;
//import java.util.HashMap;
//import java.util.List;
//import java.util.Map;
//import java.util.Set;
//import java.util.concurrent.Future;
//import java.util.regex.Pattern;
//
//import javax.xml.stream.XMLStreamException;
//import javax.xml.transform.dom.DOMResult;
//import javax.xml.transform.dom.DOMSource;
//
//import org.opendaylight.controller.md.sal.binding.api.DataBroker;
//import org.opendaylight.controller.md.sal.binding.api.MountPoint;
//import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
//import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
//import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
//import org.opendaylight.controller.md.sal.dom.api.DOMEvent;
//import org.opendaylight.controller.md.sal.dom.api.DOMMountPoint;
//import org.opendaylight.controller.md.sal.dom.api.DOMNotification;
//import org.opendaylight.controller.md.sal.dom.api.DOMNotificationListener;
//import org.opendaylight.controller.md.sal.dom.api.DOMNotificationPublishService;
//import org.opendaylight.controller.md.sal.dom.api.DOMNotificationService;
//import org.opendaylight.controller.messagebus.app.impl.TopicDOMNotification;
//import org.opendaylight.controller.messagebus.app.impl.Util;
//import org.opendaylight.controller.messagebus.spi.EventSource;
//import org.opendaylight.controller.config.util.xml.XmlUtil;
//import org.opendaylight.controller.sal.connect.netconf.util.NetconfMessageTransformUtil;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventaggregator.rev141202.NotificationPattern;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventaggregator.rev141202.TopicId;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventaggregator.rev141202.TopicNotification;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.JoinTopicInput;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.JoinTopicOutput;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.JoinTopicOutputBuilder;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.JoinTopicStatus;
//import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.DisJoinTopicInput;
//import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.netmod.notification.rev080714.Netconf;
//import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.netmod.notification.rev080714.netconf.Streams;
//import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.netmod.notification.rev080714.netconf.streams.Stream;
//import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNode;
//import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
//import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
//import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
//import org.opendaylight.yangtools.yang.common.QName;
//import org.opendaylight.yangtools.yang.common.RpcResult;
//import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
//import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
//import org.opendaylight.yangtools.yang.data.api.schema.AnyXmlNode;
//import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
//import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
//import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
//import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
//import org.opendaylight.yangtools.yang.model.api.SchemaContext;
//import org.opendaylight.yangtools.yang.model.api.SchemaPath;
//import org.slf4j.Logger;
//import org.slf4j.LoggerFactory;
//import org.w3c.dom.Document;
//import org.w3c.dom.Element;
//
//import com.google.common.base.Optional;
//import com.google.common.base.Preconditions;
//import com.google.common.base.Throwables;
//import com.google.common.util.concurrent.CheckedFuture;
//
//public class NetconfEventSource implements EventSource, DOMNotificationListener {
//
//    private static final Logger LOG = LoggerFactory.getLogger(NetconfEventSource.class);
//
//    private static final NodeIdentifier TOPIC_NOTIFICATION_ARG = new NodeIdentifier(TopicNotification.QNAME);
//    private static final NodeIdentifier EVENT_SOURCE_ARG = new NodeIdentifier(QName.create(TopicNotification.QNAME, "node-id"));
//    private static final NodeIdentifier TOPIC_ID_ARG = new NodeIdentifier(QName.create(TopicNotification.QNAME, "topic-id"));
//    private static final NodeIdentifier PAYLOAD_ARG = new NodeIdentifier(QName.create(TopicNotification.QNAME, "payload"));
//    private static final String ConnectionNotificationSourceName = "ConnectionNotificationSource";
//
//    private final String nodeId;
//    private final Node node;
//
//    private final DOMMountPoint netconfMount;
//    private final MountPoint mountPoint;
//    private final DOMNotificationPublishService domPublish;
//
//    private final Map<String, String> urnPrefixToStreamMap; // key = urnPrefix, value = StreamName
//    private final List<NotificationTopicRegistration> notificationTopicRegistrationList = new ArrayList<>();
//
//    public NetconfEventSource(final Node node, final Map<String, String> streamMap, final DOMMountPoint netconfMount, final MountPoint mountPoint, final DOMNotificationPublishService publishService) {
//        this.netconfMount = Preconditions.checkNotNull(netconfMount);
//        this.mountPoint = Preconditions.checkNotNull(mountPoint);
//        this.node = Preconditions.checkNotNull(node);
//        this.urnPrefixToStreamMap = Preconditions.checkNotNull(streamMap);
//        this.domPublish = Preconditions.checkNotNull(publishService);
//        this.nodeId = node.getNodeId().getValue();
//        this.initializeNotificationTopicRegistrationList();
//
//        LOG.info("NetconfEventSource [{}] created.", this.nodeId);
//    }
//
//    private void initializeNotificationTopicRegistrationList() {
//        notificationTopicRegistrationList.add(new ConnectionNotificationTopicRegistration(ConnectionNotificationSourceName, this));
//        Optional<Map<String, Stream>> streamMap = getAvailableStreams();
//        if(streamMap.isPresent()){
//            LOG.debug("Stream configuration compare...");
//            for (String urnPrefix : this.urnPrefixToStreamMap.keySet()) {
//                final String streamName = this.urnPrefixToStreamMap.get(urnPrefix);
//                LOG.debug("urnPrefix: {} streamName: {}", urnPrefix, streamName);
//                if(streamMap.get().containsKey(streamName)){
//                    LOG.debug("Stream containig on device");
//                    notificationTopicRegistrationList.add(new StreamNotificationTopicRegistration(streamMap.get().get(streamName),urnPrefix, this));
//                }
//            }
//        }
//    }
//
//    private Optional<Map<String, Stream>> getAvailableStreams(){
//
//        Map<String,Stream> streamMap = null;
//        InstanceIdentifier<Streams> pathStream = InstanceIdentifier.builder(Netconf.class).child(Streams.class).build();
//        Optional<DataBroker> dataBroker = this.mountPoint.getService(DataBroker.class);
//
//        if(dataBroker.isPresent()){
//            LOG.debug("GET Available streams ...");
//            ReadOnlyTransaction tx = dataBroker.get().newReadOnlyTransaction();
//            CheckedFuture<Optional<Streams>, ReadFailedException> checkFeature = tx.read(LogicalDatastoreType.OPERATIONAL,pathStream);
//
//            try {
//                Optional<Streams> streams = checkFeature.checkedGet();
//                if(streams.isPresent()){
//                    streamMap = new HashMap<>();
//                    for(Stream stream : streams.get().getStream()){
//                        LOG.debug("*** find stream {}", stream.getName().getValue());
//                        streamMap.put(stream.getName().getValue(), stream);
//                    }
//                }
//            } catch (ReadFailedException e) {
//                LOG.warn("Can not read streams for node {}",this.nodeId);
//            }
//
//        } else {
//            LOG.warn("No databroker on node {}", this.nodeId);
//        }
//
//        return Optional.fromNullable(streamMap);
//    }
//
//    @Override
//    public Future<RpcResult<JoinTopicOutput>> joinTopic(final JoinTopicInput input) {
//        LOG.debug("Join topic {} on {}", input.getTopicId().getValue(), this.nodeId);
//        final NotificationPattern notificationPattern = input.getNotificationPattern();
//        final List<SchemaPath> matchingNotifications = getMatchingNotifications(notificationPattern);
//        return registerTopic(input.getTopicId(),matchingNotifications);
//
//    }
//
//    @Override
//    public Future<RpcResult<Void>> disJoinTopic(DisJoinTopicInput input) {
//         for(NotificationTopicRegistration reg : notificationTopicRegistrationList){
//             reg.unRegisterNotificationTopic(input.getTopicId());
//         }
//        return Util.resultRpcSuccessFor((Void) null) ;
//    }
//
//    private synchronized Future<RpcResult<JoinTopicOutput>> registerTopic(final TopicId topicId, final List<SchemaPath> notificationsToSubscribe){
//        LOG.debug("Join topic {} - register");
//        JoinTopicStatus joinTopicStatus = JoinTopicStatus.Down;
//        if(notificationsToSubscribe != null && notificationsToSubscribe.isEmpty() == false){
//            LOG.debug("Notifications to subscribe has found - count {}",notificationsToSubscribe.size() );
//            final Optional<DOMNotificationService> notifyService = getDOMMountPoint().getService(DOMNotificationService.class);
//            if(notifyService.isPresent()){
//                int registeredNotificationCount = 0;
//                for(SchemaPath schemaNotification : notificationsToSubscribe){
//                   for(NotificationTopicRegistration reg : notificationTopicRegistrationList){
//                       LOG.debug("Try notification registratio {} on SchemaPathNotification {}", reg.getSourceName(), schemaNotification.getLastComponent().getLocalName());
//                       if(reg.checkNotificationPath(schemaNotification)){
//                           LOG.info("Source of notification {} is activating, TopicId {}", reg.getSourceName(), topicId.getValue() );
//                           boolean regSuccess = reg.registerNotificationTopic(schemaNotification, topicId);
//                           if(regSuccess){
//                              registeredNotificationCount = registeredNotificationCount +1;
//                           }
//                       }
//                   }
//                }
//                if(registeredNotificationCount > 0){
//                    joinTopicStatus = JoinTopicStatus.Up;
//                }
//            } else {
//                LOG.warn("NO DOMNotification service on node {}", this.nodeId);
//            }
//        } else {
//            LOG.debug("Notifications to subscribe has NOT found");
//        }
//
//        final JoinTopicOutput output = new JoinTopicOutputBuilder().setStatus(joinTopicStatus).build();
//        return immediateFuture(RpcResultBuilder.success(output).build());
//
//    }
//
//    public void reActivateStreams(){
//        for (NotificationTopicRegistration reg : notificationTopicRegistrationList) {
//           LOG.info("Source of notification {} is reactivating on node {}", reg.getSourceName(), this.nodeId);
//            reg.reActivateNotificationSource();
//        }
//    }
//
//    public void deActivateStreams(){
//        for (NotificationTopicRegistration reg : notificationTopicRegistrationList) {
//           LOG.info("Source of notification {} is deactivating on node {}", reg.getSourceName(), this.nodeId);
//           reg.deActivateNotificationSource();
//        }
//    }
//
//    @Override
//    public void onNotification(final DOMNotification notification) {
//        SchemaPath notificationPath = notification.getType();
//        Date notificationEventTime = null;
//        if(notification instanceof DOMEvent){
//            notificationEventTime = ((DOMEvent) notification).getEventTime();
//        }
//        for(NotificationTopicRegistration notifReg : notificationTopicRegistrationList){
//            ArrayList<TopicId> topicIdsForNotification = notifReg.getNotificationTopicIds(notificationPath);
//            if(topicIdsForNotification != null && topicIdsForNotification.isEmpty() == false){
//
//                if(notifReg instanceof StreamNotificationTopicRegistration){
//                    StreamNotificationTopicRegistration streamReg = (StreamNotificationTopicRegistration)notifReg;
//                    streamReg.setLastEventTime(notificationEventTime);
//                }
//
//                for(TopicId topicId : topicIdsForNotification){
//                    publishNotification(notification, topicId);
//                    LOG.debug("Notification {} has been published for TopicId {}",notification.getType(), topicId.getValue());
//                }
//
//            }
//        }
//    }
//
//    private void publishNotification(final DOMNotification notification, TopicId topicId){
//         final ContainerNode topicNotification = Builders.containerBuilder()
//                 .withNodeIdentifier(TOPIC_NOTIFICATION_ARG)
//                 .withChild(ImmutableNodes.leafNode(TOPIC_ID_ARG, topicId))
//                 .withChild(ImmutableNodes.leafNode(EVENT_SOURCE_ARG, this.nodeId))
//                 .withChild(encapsulate(notification))
//                 .build();
//         try {
//             domPublish.putNotification(new TopicDOMNotification(topicNotification));
//         } catch (final InterruptedException e) {
//             throw Throwables.propagate(e);
//         }
//    }
//
//    private AnyXmlNode encapsulate(final DOMNotification body) {
//        // FIXME: Introduce something like AnyXmlWithNormalizedNodeData in Yangtools
//        final Document doc = XmlUtil.newDocument();
//        final Optional<String> namespace = Optional.of(PAYLOAD_ARG.getNodeType().getNamespace().toString());
//        final Element element = XmlUtil.createElement(doc , "payload", namespace);
//
//        final DOMResult result = new DOMResult(element);
//
//        final SchemaContext context = getDOMMountPoint().getSchemaContext();
//        final SchemaPath schemaPath = body.getType();
//        try {
//            NetconfMessageTransformUtil.writeNormalizedNode(body.getBody(), result, schemaPath, context);
//            return Builders.anyXmlBuilder().withNodeIdentifier(PAYLOAD_ARG)
//                    .withValue(new DOMSource(element))
//                    .build();
//        } catch (IOException | XMLStreamException e) {
//            LOG.error("Unable to encapsulate notification.",e);
//            throw Throwables.propagate(e);
//        }
//    }
//
//    private List<SchemaPath> getMatchingNotifications(NotificationPattern notificationPattern){
//        // FIXME: default language should already be regex
//        final String regex = Util.wildcardToRegex(notificationPattern.getValue());
//
//        final Pattern pattern = Pattern.compile(regex);
//        List<SchemaPath> availableNotifications = getAvailableNotifications();
//        if(availableNotifications == null || availableNotifications.isEmpty()){
//            return null;
//        }
//        return Util.expandQname(availableNotifications, pattern);
//    }
//
//    @Override
//    public void close() throws Exception {
//        for(NotificationTopicRegistration streamReg : notificationTopicRegistrationList){
//            streamReg.close();
//        }
//    }
//
//    @Override
//    public NodeKey getSourceNodeKey(){
//        return getNode().getKey();
//    }
//
//    @Override
//    public List<SchemaPath> getAvailableNotifications() {
//
//        final List<SchemaPath> availNotifList = new ArrayList<>();
//        // add Event Source Connection status notification
//        availNotifList.add(ConnectionNotificationTopicRegistration.EVENT_SOURCE_STATUS_PATH);
//
//        // FIXME: use SchemaContextListener to get changes asynchronously
//        final Set<NotificationDefinition> availableNotifications = getDOMMountPoint().getSchemaContext().getNotifications();
//        // add all known notifications from netconf device
//        for (final NotificationDefinition nd : availableNotifications) {
//            availNotifList.add(nd.getPath());
//        }
//        return availNotifList;
//    }
//
//    public Node getNode() {
//        return node;
//    }
//
//    DOMMountPoint getDOMMountPoint() {
//        return netconfMount;
//    }
//
//    MountPoint getMountPoint() {
//        return mountPoint;
//    }
//
//    NetconfNode getNetconfNode(){
//        return node.getAugmentation(NetconfNode.class);
//    }
//
//}