/*
 * 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.ovsdb.southbound.transactions.md;

import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
import org.opendaylight.ovsdb.lib.message.TableUpdates;
import org.opendaylight.ovsdb.lib.schema.DatabaseSchema;
import org.opendaylight.ovsdb.southbound.OvsdbConnectionInstance;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbNodeAugmentation;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.ovsdb.node.attributes.ManagedNodeEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.ovsdb.node.attributes.ManagerEntry;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Optional;
import com.google.common.util.concurrent.CheckedFuture;

public class OvsdbNodeRemoveCommand extends AbstractTransactionCommand {
    private static final Logger LOG = LoggerFactory.getLogger(OvsdbNodeRemoveCommand.class);

    public OvsdbNodeRemoveCommand(OvsdbConnectionInstance key,TableUpdates updates,DatabaseSchema dbSchema) {
        super(key,updates,dbSchema);
    }

    @Override
    public void execute(ReadWriteTransaction transaction) {
        CheckedFuture<Optional<Node>, ReadFailedException> ovsdbNodeFuture = transaction.read(
                LogicalDatastoreType.OPERATIONAL, getOvsdbConnectionInstance().getInstanceIdentifier());
        Optional<Node> ovsdbNodeOptional;
        try {
            ovsdbNodeOptional = ovsdbNodeFuture.get();
            if (ovsdbNodeOptional.isPresent()) {
                Node ovsdbNode = ovsdbNodeOptional.get();
                OvsdbNodeAugmentation ovsdbNodeAugmentation = ovsdbNode.getAugmentation(OvsdbNodeAugmentation.class);
                if (checkIfOnlyConnectedManager(ovsdbNodeAugmentation)) {
                    if (ovsdbNodeAugmentation != null) {
                        if (ovsdbNodeAugmentation.getManagedNodeEntry() != null) {
                            for (ManagedNodeEntry managedNode : ovsdbNodeAugmentation.getManagedNodeEntry()) {
                                transaction.delete(
                                        LogicalDatastoreType.OPERATIONAL, managedNode.getBridgeRef().getValue());
                            }
                        } else {
                            LOG.debug("{} had no managed nodes", ovsdbNode.getNodeId().getValue());
                        }
                    } else {
                        LOG.warn("{} had no OvsdbNodeAugmentation", ovsdbNode.getNodeId().getValue());
                    }
                    transaction.delete(LogicalDatastoreType.OPERATIONAL,
                            getOvsdbConnectionInstance().getInstanceIdentifier());
                } else {
                    LOG.debug("Other southbound plugin instances in cluster are connected to the device,"
                            + " not deleting OvsdbNode form data store.");
                }
            }
        } catch (Exception e) {
            LOG.warn("Failure to delete ovsdbNode {}",e);
        }
    }

    private boolean checkIfOnlyConnectedManager(OvsdbNodeAugmentation ovsdbNodeAugmentation) {
        if (ovsdbNodeAugmentation != null) {
            int connectedManager = 0;
            for (ManagerEntry manager : ovsdbNodeAugmentation.getManagerEntry()) {
                if (manager.isIsConnected()) {
                    connectedManager++;
                    if (connectedManager > 1) {
                        return false;
                    }
                }
            }
        }
        return true;
    }
}