/*
 * Copyright (c) 2013 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.protocol.pcep.parser.subobject;

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

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.opendaylight.protocol.pcep.PCEPDeserializerException;
import org.opendaylight.protocol.pcep.spi.XROSubobjectParser;
import org.opendaylight.protocol.pcep.spi.XROSubobjectSerializer;
import org.opendaylight.protocol.pcep.spi.XROSubobjectUtil;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev181109.exclude.route.object.xro.Subobject;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev181109.exclude.route.object.xro.SubobjectBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.ExcludeRouteSubobjects.Attribute;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.UnnumberedSubobject;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.UnnumberedCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.UnnumberedCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.basic.explicit.route.subobjects.subobject.type.unnumbered._case.UnnumberedBuilder;
import org.opendaylight.yangtools.yang.common.netty.ByteBufUtils;

/**
 * Parser for {@link UnnumberedCase}.
 */
public class XROUnnumberedInterfaceSubobjectParser implements XROSubobjectParser, XROSubobjectSerializer {
    public static final int TYPE = 4;

    private static final int RESERVED = 1;
    private static final int CONTENT_LENGTH = 10;

    @Override
    public Subobject parseSubobject(final ByteBuf buffer, final boolean mandatory) throws PCEPDeserializerException {
        checkArgument(buffer != null && buffer.isReadable(), "Array of bytes is mandatory. Cannot be null or empty.");
        if (buffer.readableBytes() != CONTENT_LENGTH) {
            throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.readableBytes()
                + "; Expected: " + CONTENT_LENGTH + ".");
        }
        buffer.readerIndex(buffer.readerIndex() + RESERVED);
        final Attribute attr = Attribute.forValue(buffer.readUnsignedByte());
        final UnnumberedBuilder ubuilder = new UnnumberedBuilder()
                .setRouterId(ByteBufUtils.readUint32(buffer))
                .setInterfaceId(ByteBufUtils.readUint32(buffer));
        return new SubobjectBuilder()
                .setMandatory(mandatory)
                .setAttribute(attr)
                .setSubobjectType(new UnnumberedCaseBuilder().setUnnumbered(ubuilder.build()).build())
                .build();
    }

    @Override
    public void serializeSubobject(final Subobject subobject, final ByteBuf buffer) {
        checkArgument(subobject.getSubobjectType() instanceof UnnumberedCase,
            "Unknown subobject instance. Passed %s. Needed UnnumberedCase.", subobject.getSubobjectType().getClass());
        final UnnumberedSubobject specObj = ((UnnumberedCase) subobject.getSubobjectType()).getUnnumbered();
        final ByteBuf body = Unpooled.buffer(CONTENT_LENGTH);
        body.writeZero(RESERVED);

        final Attribute attribute = subobject.getAttribute();
        body.writeByte(attribute != null ? attribute.getIntValue() : 0);

        ByteBufUtils.writeMandatory(body, specObj.getRouterId(), "RouterId");
        ByteBufUtils.writeMandatory(body, specObj.getInterfaceId(), "InterfaceId");
        XROSubobjectUtil.formatSubobject(TYPE, subobject.getMandatory(), body, buffer);
    }
}