/*
 * Copyright (c) 2015 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.ovsdb.hwvtepsouthbound.transactions.md;

import com.google.common.base.Optional;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.ovsdb.hwvtepsouthbound.HwvtepConnectionInstance;
import org.opendaylight.ovsdb.hwvtepsouthbound.HwvtepSouthboundMapper;
import org.opendaylight.ovsdb.hwvtepsouthbound.HwvtepSouthboundUtil;
import org.opendaylight.ovsdb.lib.message.TableUpdates;
import org.opendaylight.ovsdb.lib.notation.UUID;
import org.opendaylight.ovsdb.lib.schema.DatabaseSchema;
import org.opendaylight.ovsdb.lib.schema.typed.TyperUtils;
import org.opendaylight.ovsdb.schema.hardwarevtep.LogicalSwitch;
import org.opendaylight.ovsdb.schema.hardwarevtep.McastMacsRemote;
import org.opendaylight.ovsdb.schema.hardwarevtep.PhysicalLocator;
import org.opendaylight.ovsdb.schema.hardwarevtep.PhysicalLocatorSet;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.MacAddress;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepGlobalAugmentation;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepGlobalAugmentationBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepLogicalSwitchRef;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepPhysicalLocatorRef;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.RemoteMcastMacs;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.RemoteMcastMacsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.physical.locator.set.attributes.LocatorSet;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.physical.locator.set.attributes.LocatorSetBuilder;
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.NodeBuilder;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPoint;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class McastMacsRemoteUpdateCommand extends AbstractTransactionCommand {

    private static final Logger LOG = LoggerFactory.getLogger(McastMacsRemoteUpdateCommand.class);
    private Map<UUID, McastMacsRemote> updatedMMacsRemoteRows;
    private Map<UUID, McastMacsRemote> oldMMacsRemoteRows;
    private Map<UUID, PhysicalLocatorSet> updatedPLocSetRows;
    private Map<UUID, PhysicalLocator> updatedPLocRows;
    private Map<UUID, LogicalSwitch> updatedLSRows;

    public McastMacsRemoteUpdateCommand(HwvtepConnectionInstance key, TableUpdates updates,
            DatabaseSchema dbSchema) {
        super(key, updates, dbSchema);
        updatedMMacsRemoteRows = TyperUtils.extractRowsUpdated(McastMacsRemote.class, getUpdates(),getDbSchema());
        oldMMacsRemoteRows = TyperUtils.extractRowsOld(McastMacsRemote.class, getUpdates(),getDbSchema());
        updatedPLocSetRows = TyperUtils.extractRowsUpdated(PhysicalLocatorSet.class, getUpdates(),getDbSchema());
        updatedPLocRows = TyperUtils.extractRowsUpdated(PhysicalLocator.class, getUpdates(),getDbSchema());
        updatedLSRows = TyperUtils.extractRowsUpdated(LogicalSwitch.class, getUpdates(),getDbSchema());
    }

    @Override
    public void execute(ReadWriteTransaction transaction) {
        if(updatedMMacsRemoteRows != null && !updatedMMacsRemoteRows.isEmpty()) {
            for (Entry<UUID, McastMacsRemote> entry : updatedMMacsRemoteRows.entrySet()) {
                updateData(transaction, entry.getValue());
            }
        }
    }

    private void updateData(ReadWriteTransaction transaction, McastMacsRemote mMacRemote) {
        final InstanceIdentifier<Node> connectionIId = getOvsdbConnectionInstance().getInstanceIdentifier();
        Optional<Node> connection = HwvtepSouthboundUtil.readNode(transaction, connectionIId);
        if (connection.isPresent()) {
            // Update the connection node to let it know it manages this MCastMacsRemote
            Node connectionNode = buildConnectionNode(mMacRemote);
            transaction.merge(LogicalDatastoreType.OPERATIONAL, connectionIId, connectionNode);
//            TODO: Delete entries that are no longer needed
        }
    }

    private Node buildConnectionNode(McastMacsRemote mMacRemote) {
        NodeBuilder connectionNode = new NodeBuilder();
        connectionNode.setNodeId(getOvsdbConnectionInstance().getNodeId());
        HwvtepGlobalAugmentationBuilder hgAugmentationBuilder = new HwvtepGlobalAugmentationBuilder();
        RemoteMcastMacsBuilder mMacRemoteBuilder= new RemoteMcastMacsBuilder();
        mMacRemoteBuilder.setMacEntryKey(new MacAddress(mMacRemote.getMac()));
        setIpAddress(mMacRemoteBuilder, mMacRemote);
        setLocatorSet(mMacRemoteBuilder, mMacRemote);
        setLogicalSwitch(mMacRemoteBuilder, mMacRemote);

        List<RemoteMcastMacs> mMacRemoteList = new ArrayList<>();
        mMacRemoteList.add(mMacRemoteBuilder.build());
        hgAugmentationBuilder.setRemoteMcastMacs(mMacRemoteList);
        connectionNode.addAugmentation(HwvtepGlobalAugmentation.class, hgAugmentationBuilder.build());
        return connectionNode.build();
    }

    private void setLogicalSwitch(RemoteMcastMacsBuilder mMacRemoteBuilder, McastMacsRemote mMacRemote) {
        LogicalSwitch lSwitch = null;
        if (mMacRemote.getLogicalSwitchColumn() != null && mMacRemote.getLogicalSwitchColumn().getData() != null) {
            UUID lsUUID = mMacRemote.getLogicalSwitchColumn().getData();
            if (updatedLSRows.get(lsUUID) != null) {
                lSwitch = updatedLSRows.get(lsUUID);
                mMacRemoteBuilder.setLogicalSwitchRef(new HwvtepLogicalSwitchRef(lSwitch.getName()));
            }
        }
    }

    private void setIpAddress(RemoteMcastMacsBuilder mMacRemoteBuilder, McastMacsRemote mMacRemote) {
        if(mMacRemote.getIpAddr() != null && !mMacRemote.getIpAddr().isEmpty()) {
            mMacRemoteBuilder.setIpaddr(new IpAddress(mMacRemote.getIpAddr().toCharArray()));
        }
    }

    private void setLocatorSet(RemoteMcastMacsBuilder mMacRemoteBuilder, McastMacsRemote mMacRemote) {
        if (mMacRemote.getLocatorSetColumn() != null && mMacRemote.getLocatorSetColumn().getData() != null) {
            UUID pLocSetUUID = mMacRemote.getLocatorSetColumn().getData();
            if (updatedPLocSetRows.get(pLocSetUUID) != null) {
                PhysicalLocatorSet plSet = updatedPLocSetRows.get(pLocSetUUID);
                if (plSet.getLocatorsColumn() != null && plSet.getLocatorsColumn().getData() != null
                                && !plSet.getLocatorsColumn().getData().isEmpty()) {
                    List<LocatorSet> plsList = new ArrayList<>();
                    for (UUID pLocUUID : plSet.getLocatorsColumn().getData()) {
                        PhysicalLocator pLoc = updatedPLocRows.get(pLocUUID);
                        InstanceIdentifier<TerminationPoint> tpIid = HwvtepSouthboundMapper.createInstanceIdentifier(
                                        getOvsdbConnectionInstance().getInstanceIdentifier(), pLoc);
                        plsList.add(new LocatorSetBuilder()
                                    .setLocatorRef(new HwvtepPhysicalLocatorRef(tpIid)).build());
                    }
                    mMacRemoteBuilder.setLocatorSet(plsList);
                }
            }
        }
    }

}