/*
 * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. 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.netvirt.elan.l2gw.jobs;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentMap;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.genius.utils.hwvtep.HwvtepUtils;
import org.opendaylight.netvirt.elan.l2gw.utils.ElanL2GatewayUtils;
import org.opendaylight.netvirt.elanmanager.utils.ElanL2GwCacheUtils;
import org.opendaylight.netvirt.neutronvpn.api.l2gw.L2GatewayDevice;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.MacAddress;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Job class to delete L2 gateway device local ucast macs from other Elan L2
 * gateway devices.
 */
public class DeleteL2GwDeviceMacsFromElanJob implements Callable<List<ListenableFuture<Void>>> {

    /** The Constant JOB_KEY_PREFIX. */
    private static final String JOB_KEY_PREFIX = "hwvtep:";

    /** The Constant LOG. */
    private static final Logger LOG = LoggerFactory.getLogger(DeleteL2GwDeviceMacsFromElanJob.class);

    /** The broker. */
    private final DataBroker broker;

    /** The elan name. */
    private final String elanName;

    /** The l2 gw device. */
    private final L2GatewayDevice l2GwDevice;

    /** The mac addresses. */
    private final List<MacAddress> macAddresses;

    /**
     * Instantiates a new delete l2 gw device macs from elan job.
     *
     * @param broker
     *            the broker
     * @param elanName
     *            the elan name
     * @param l2GwDevice
     *            the l2 gw device
     * @param macAddresses
     *            the mac addresses
     */
    public DeleteL2GwDeviceMacsFromElanJob(DataBroker broker, String elanName, L2GatewayDevice l2GwDevice,
            List<MacAddress> macAddresses) {
        this.broker = broker;
        this.elanName = elanName;
        this.l2GwDevice = l2GwDevice;
        this.macAddresses = macAddresses;
    }

    /**
     * Gets the job key.
     *
     * @return the job key
     */
    public String getJobKey() {
        String jobKey = JOB_KEY_PREFIX + this.elanName;
        if (macAddresses != null && macAddresses.size() == 1) {
            jobKey += ":" + macAddresses.get(0).getValue();
        }
        return jobKey;
    }

    /*
     * (non-Javadoc)
     *
     * @see java.util.concurrent.Callable#call()
     */
    @Override
    public List<ListenableFuture<Void>> call() {
        LOG.debug("Deleting l2gw device [{}] macs from other l2gw devices for elan [{}]",
                this.l2GwDevice.getHwvtepNodeId(), this.elanName);
        final String logicalSwitchName = ElanL2GatewayUtils.getLogicalSwitchFromElan(this.elanName);

        ConcurrentMap<String, L2GatewayDevice> elanL2GwDevices = ElanL2GwCacheUtils
                .getInvolvedL2GwDevices(this.elanName);
        List<ListenableFuture<Void>> futures = new ArrayList<>();
        for (L2GatewayDevice otherDevice : elanL2GwDevices.values()) {
            if (!otherDevice.getHwvtepNodeId().equals(this.l2GwDevice.getHwvtepNodeId())
                    && !ElanL2GatewayUtils.areMLAGDevices(this.l2GwDevice, otherDevice)) {
                final String hwvtepId = otherDevice.getHwvtepNodeId();
                // never batch deletes
                ListenableFuture<Void> uninstallFuture = HwvtepUtils.deleteRemoteUcastMacs(this.broker,
                        new NodeId(hwvtepId), logicalSwitchName, this.macAddresses);
                Futures.addCallback(uninstallFuture, new FutureCallback<Void>() {
                    @Override
                    public void onSuccess(Void noarg) {
                        LOG.trace("Successful in initiating ucast_remote_macs deletion related to {} in {}",
                                logicalSwitchName, hwvtepId);
                    }

                    @Override
                    public void onFailure(Throwable error) {
                        LOG.error(String.format("Failed removing ucast_remote_macs related to %s in %s",
                                logicalSwitchName, hwvtepId), error);
                    }
                });
                futures.add(uninstallFuture);
            }
        }
        return futures;
    }
}