/**
 * Copyright (c) 2014 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.openflowplugin.applications.topology.lldp;

import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipService;
import org.opendaylight.openflowplugin.applications.topology.lldp.utils.LLDPDiscoveryUtils;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.topology.discovery.rev130819.LinkDiscovered;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.topology.discovery.rev130819.LinkDiscoveredBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorRef;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingListener;
import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketReceived;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LLDPDiscoveryListener implements PacketProcessingListener {
    private static final Logger LOG = LoggerFactory.getLogger(LLDPDiscoveryListener.class);

    private final LLDPLinkAger lldpLinkAger;
    private final NotificationProviderService notificationService;
    private final EntityOwnershipService eos;


    public LLDPDiscoveryListener(final NotificationProviderService notificationService, final LLDPLinkAger lldpLinkAger,
            final EntityOwnershipService entityOwnershipService) {
        this.notificationService = notificationService;
        this.lldpLinkAger = lldpLinkAger;
        this.eos = entityOwnershipService;
    }

    @Override
    public void onPacketReceived(PacketReceived lldp) {
        NodeConnectorRef src = LLDPDiscoveryUtils.lldpToNodeConnectorRef(lldp.getPayload(), true);
        if (src != null) {
            NodeKey nodeKey = src.getValue().firstKeyOf(Node.class);
            LOG.debug("LLDP packet received for node {}", nodeKey);
            if (nodeKey != null) {
                LinkDiscoveredBuilder ldb = new LinkDiscoveredBuilder();
                ldb.setDestination(lldp.getIngress());
                ldb.setSource(new NodeConnectorRef(src));
                LinkDiscovered ld = ldb.build();

                lldpLinkAger.put(ld);
                if (LLDPDiscoveryUtils.isEntityOwned(this.eos, nodeKey.getId().getValue())) {
                    LOG.debug("Publish add event for link {}", ld);
                    notificationService.publish(ld);
                } else {
                    LOG.trace("Skip publishing the add event for link because controller is non-owner of the " +
                            "node {}. Link : {}", nodeKey.getId().getValue(), ld);
                }
            } else {
                LOG.debug("LLDP packet ignored. Unable to extract node-key from source node-connector reference.");
            }
        }
    }
}