/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.fd.honeycomb.v3po.translate.v3po.interfaces.ip;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.base.Optional;
import io.fd.honeycomb.v3po.translate.spi.write.ListWriterCustomizer;
import io.fd.honeycomb.v3po.translate.v3po.util.FutureJVppCustomizer;
import io.fd.honeycomb.v3po.translate.v3po.util.NamingContext;
import io.fd.honeycomb.v3po.translate.v3po.util.TranslateUtils;
import io.fd.honeycomb.v3po.translate.write.WriteContext;
import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
import java.util.List;
import java.util.concurrent.CompletionStage;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.Ipv4;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.AddressKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.Subnet;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.subnet.Netmask;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.subnet.PrefixLength;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.openvpp.jvpp.VppBaseCallException;
import org.openvpp.jvpp.dto.SwInterfaceAddDelAddress;
import org.openvpp.jvpp.dto.SwInterfaceAddDelAddressReply;
import org.openvpp.jvpp.future.FutureJVpp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Customizer for writing {@link Address}
 *
 * @author jsrnicek
 */
public class AddressCustomizer extends FutureJVppCustomizer implements ListWriterCustomizer<Address, AddressKey> {

    private static final Logger LOG = LoggerFactory.getLogger(AddressCustomizer.class);
    private final NamingContext interfaceContext;

    public AddressCustomizer(FutureJVpp futureJvpp, NamingContext interfaceContext) {
        super(futureJvpp);
        this.interfaceContext = interfaceContext;
    }

    @Override
    public void writeCurrentAttributes(InstanceIdentifier<Address> id, Address dataAfter, WriteContext writeContext)
            throws WriteFailedException {
        setAddress(true, id, dataAfter, writeContext);
    }

    @Override
    public void updateCurrentAttributes(InstanceIdentifier<Address> id, Address dataBefore, Address dataAfter,
            WriteContext writeContext) throws WriteFailedException {
        throw new WriteFailedException.UpdateFailedException(id,dataBefore,dataAfter,new UnsupportedOperationException("Operation not supported"));
    }

    @Override
    public void deleteCurrentAttributes(InstanceIdentifier<Address> id, Address dataBefore, WriteContext writeContext)
            throws WriteFailedException {
        setAddress(false, id, dataBefore, writeContext);
    }

    @Override
    public Optional<List<Address>> extract(InstanceIdentifier<Address> currentId, DataObject parentData) {
        return Optional.fromNullable((((Ipv4)parentData).getAddress()));
    }

    private void setAddress(boolean add,final InstanceIdentifier<Address> id,  final Address address,
            final WriteContext writeContext) throws WriteFailedException {

        final String interfaceName = id.firstKeyOf(Interface.class).getName();
        final int swIfc = interfaceContext.getIndex(interfaceName, writeContext.getMappingContext());

        Subnet subnet = address.getSubnet();

        if (subnet instanceof PrefixLength) {
            setPrefixLengthSubnet(add,id, interfaceName, swIfc, address, (PrefixLength) subnet);
        } else if (subnet instanceof Netmask) {
            setNetmaskSubnet();
        } else {
            // FIXME how does choice extensibility work
            // FIXME it is not even possible to create a dedicated
            // customizer for Interconnection, since it's not a DataObject
            // FIXME we might need a choice customizer
            // THis choice is already from augment, so its probably not
            // possible to augment augmented choice
            LOG.error("Unable to handle subnet of type {}", subnet.getClass());
            throw new WriteFailedException(id, "Unable to handle subnet of type " + subnet.getClass());
        }
    }

    private void setNetmaskSubnet() {
        // FIXME
        throw new UnsupportedOperationException("Unimplemented");
    }

    private void setPrefixLengthSubnet(boolean add,final InstanceIdentifier<Address> id, final String name, final int swIfc,
            final Address address, final PrefixLength subnet) throws WriteFailedException {
        try {
            Short plen = subnet.getPrefixLength();
            LOG.debug("Setting Subnet(prefix-length) for interface: {}, {}. Subnet: {}, Address: {}", name, swIfc,
                    subnet, address);

            byte[] addr = TranslateUtils.ipv4AddressNoZoneToArray(address.getIp());

            checkArgument(plen > 0, "Invalid length");
            checkNotNull(addr, "Null address");

            final CompletionStage<SwInterfaceAddDelAddressReply> swInterfaceAddDelAddressReplyCompletionStage = getFutureJVpp()
                    .swInterfaceAddDelAddress(getSwInterfaceAddDelAddressRequest(swIfc, TranslateUtils.booleanToByte(add) /* isAdd */,
                            (byte) 0 /* isIpv6 */, (byte) 0 /* delAll */, plen.byteValue(), addr));

            TranslateUtils.getReply(swInterfaceAddDelAddressReplyCompletionStage.toCompletableFuture());

            LOG.debug("Subnet(prefix-length) set successfully for interface: {}, {},  Subnet: {}, Address: {}", name,
                    swIfc, subnet, address);
        } catch (VppBaseCallException e) {
            LOG.warn("Failed to set Subnet(prefix-length) for interface: {}, {},  Subnet: {}, Address: {}", name, swIfc,
                    subnet, address);
            throw new WriteFailedException(id, "Unable to handle subnet of type " + subnet.getClass(), e);
        }
    }

    private SwInterfaceAddDelAddress getSwInterfaceAddDelAddressRequest(final int swIfc, final byte isAdd,
            final byte ipv6, final byte deleteAll, final byte length, final byte[] addr) {
        final SwInterfaceAddDelAddress swInterfaceAddDelAddress = new SwInterfaceAddDelAddress();
        swInterfaceAddDelAddress.swIfIndex = swIfc;
        swInterfaceAddDelAddress.isAdd = isAdd;
        swInterfaceAddDelAddress.isIpv6 = ipv6;
        swInterfaceAddDelAddress.delAll = deleteAll;
        swInterfaceAddDelAddress.address = addr;
        swInterfaceAddDelAddress.addressLength = length;
        return swInterfaceAddDelAddress;
    }

}