/*
 * Copyright (c) 2015 Red Hat, 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.netvirt.openstack.netvirt;

import com.google.common.base.Optional;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipState;
import org.opendaylight.netvirt.openstack.netvirt.api.Constants;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Sam Hague (shague@redhat.com)
 */
public class NetvirtProvider implements AutoCloseable {
    private static final Logger LOG = LoggerFactory.getLogger(NetvirtProvider.class);
    private final BundleContext bundleContext;
    private final DataBroker dataBroker;
    private ConfigActivator activator;
    private static EntityOwnershipService entityOwnershipService;
    private static final Entity ownerInstanceEntity = new Entity(
            Constants.NETVIRT_OWNER_ENTITY_TYPE, Constants.NETVIRT_OWNER_ENTITY_TYPE);
    private boolean conntrackEnabled;
    private boolean intBridgeGenMac;

    public NetvirtProvider(final DataBroker dataBroker,
                           final EntityOwnershipService eos,
                           final boolean conntrackEnabled,
                           final boolean intBridgeGenMac) {
        LOG.info("NetvirtProvider started");
        this.dataBroker = dataBroker;
        NetvirtProvider.entityOwnershipService = eos;
        this.conntrackEnabled = conntrackEnabled;
        this.intBridgeGenMac = intBridgeGenMac;
        this.bundleContext = FrameworkUtil.getBundle(NetvirtProvider.class).getBundleContext();
    }

    public static boolean isMasterProviderInstance() {
        if (entityOwnershipService != null) {
            Optional<EntityOwnershipState> state = entityOwnershipService.getOwnershipState(ownerInstanceEntity);
            return state.isPresent() && state.get().isOwner();
        }
        return false;
    }

    public static boolean isMasterElected(){
        if (entityOwnershipService != null) {
            Optional<EntityOwnershipState> state = entityOwnershipService.getOwnershipState(ownerInstanceEntity);
            return state.isPresent() && state.get().hasOwner();
        }
        return false;
    }

    @Override
    public void close() throws Exception {
        LOG.info("NetvirtProvider closed");
        if (activator != null) {
            activator.stop(bundleContext);
        }
    }

    public void start() {
        LOG.info("NetvirtProvider: onSessionInitiated dataBroker: {}", dataBroker);
        LOG.info("NetvirtProvider: onSessionInitiated isConntrackEnabled: {}", this.conntrackEnabled);
        this.activator = new ConfigActivator(dataBroker);
        activator.setConntrackEnabled(this.conntrackEnabled);
        activator.setIntBridgeGenMac(this.intBridgeGenMac);
        try {
            activator.start(bundleContext);
        } catch (Exception e) {
            LOG.warn("Failed to start Netvirt: ", e);
        }
    }

    public boolean isConntrackEnabled() {
        return conntrackEnabled;
    }

    public void setConntrackEnabled(boolean conntackEnabled) {
        this.conntrackEnabled = conntackEnabled;
    }

    public boolean getIntBridgeGenMac() {
        return intBridgeGenMac;
    }

    public void setIntBridgeGenMac(boolean intBridgeGenMac) {
        this.intBridgeGenMac = intBridgeGenMac;
    }
}