/*
 * Copyright (c) 2017 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.hc2vpp.v3po.write;

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

import io.fd.hc2vpp.common.translate.util.ByteDataTranslator;
import io.fd.hc2vpp.common.translate.util.FutureJVppCustomizer;
import io.fd.hc2vpp.common.translate.util.JvppReplyConsumer;
import io.fd.hc2vpp.common.translate.util.NamingContext;
import io.fd.honeycomb.translate.write.WriteContext;
import io.fd.honeycomb.translate.write.WriteFailedException;
import io.fd.jvpp.core.dto.SwInterfaceSetTable;
import io.fd.jvpp.core.dto.SwInterfaceSetTableReply;
import io.fd.jvpp.core.future.FutureJVppCore;
import java.util.concurrent.CompletionStage;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.v3po.rev190502.RoutingBaseAttributes;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.fib.table.management.rev180521.VniReference;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

abstract class RoutingCustomizer extends FutureJVppCustomizer implements JvppReplyConsumer, ByteDataTranslator {
    private static final Logger LOG = LoggerFactory.getLogger(RoutingCustomizer.class);
    protected final NamingContext interfaceContext;

    protected RoutingCustomizer(@Nonnull final FutureJVppCore futureJVppCore,
                                @Nonnull final NamingContext interfaceContext) {
        super(futureJVppCore);
        this.interfaceContext = interfaceContext;
    }

    protected void setRouting(@Nonnull final InstanceIdentifier<? extends RoutingBaseAttributes> id,
                              @Nonnull final String name,
                              @Nonnull final RoutingBaseAttributes rt,
                              @Nonnull final WriteContext writeContext) throws WriteFailedException {
        final int swIfc = interfaceContext.getIndex(name, writeContext.getMappingContext());
        LOG.debug("Setting routing for interface: {}, {}. Routing: {}", name, swIfc, rt);
        checkArgument(rt.getIpv4VrfId() != null || rt.getIpv6VrfId() != null, "No vrf-id given");

        setVrfId(id, swIfc, rt.getIpv4VrfId(), false);
        setVrfId(id, swIfc, rt.getIpv6VrfId(), true);

        LOG.debug("Routing set successfully for interface: {}, {}, routing: {}", name, swIfc, rt);
    }

    private void setVrfId(final InstanceIdentifier<? extends RoutingBaseAttributes> id, final int swIfc,
                          final VniReference vniRef, boolean isIp6)
            throws WriteFailedException {
        if (vniRef == null || vniRef.getValue() == null) {
            return;
        }
        final CompletionStage<SwInterfaceSetTableReply> cs = getFutureJVpp().swInterfaceSetTable(
            getInterfaceSetTableRequest(swIfc, booleanToByte(isIp6), vniRef.getValue().intValue()));
        getReplyForWrite(cs.toCompletableFuture(), id);
    }

    /**
     * In this case, there is no such thing as delete routing,only thing that can be done is to disable it by setting
     * default value 0
     */
    void disableRouting(final InstanceIdentifier<? extends RoutingBaseAttributes> id, final String name,
                        final WriteContext writeContext) throws WriteFailedException {
        final int swIfc = interfaceContext.getIndex(name, writeContext.getMappingContext());
        LOG.debug("Disabling routing for interface: {}, {}.", name, swIfc);

        getReplyForDelete(getFutureJVpp()
                .swInterfaceSetTable(getInterfaceSetTableRequest(swIfc, (byte) 0, 0)).toCompletableFuture(), id);
        LOG.debug("Routing for interface: {}, {} successfully disabled", name, swIfc);

    }

    private SwInterfaceSetTable getInterfaceSetTableRequest(final int swIfc, final byte isIpv6, final int vrfId) {
        final SwInterfaceSetTable swInterfaceSetTable = new SwInterfaceSetTable();
        swInterfaceSetTable.isIpv6 = isIpv6;
        swInterfaceSetTable.swIfIndex = swIfc;
        swInterfaceSetTable.vrfId = vrfId;
        return swInterfaceSetTable;
    }
}