/*
 * 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.LabelParser;
import org.opendaylight.protocol.pcep.spi.LabelSerializer;
import org.opendaylight.protocol.pcep.spi.LabelUtil;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.label.subobject.LabelType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.label.subobject.label.type.Type1LabelCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.label.subobject.label.type.Type1LabelCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.label.subobject.label.type.type1.label._case.Type1Label;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.label.subobject.label.type.type1.label._case.Type1LabelBuilder;
import org.opendaylight.yangtools.yang.common.netty.ByteBufUtils;

/**
 * Parser for {@link Type1LabelCase}.
 */
public class Type1LabelParser implements LabelParser, LabelSerializer {
    public static final int CTYPE = 1;
    public static final int LABEL_LENGTH = 4;

    @Override
    public LabelType parseLabel(final ByteBuf buffer) throws PCEPDeserializerException {
        checkArgument(buffer != null && buffer.isReadable(), "Array of bytes is mandatory. Cannot be null or empty.");
        if (buffer.readableBytes() != LABEL_LENGTH) {
            throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.readableBytes()
                + "; Expected: " + LABEL_LENGTH + ".");
        }
        return new Type1LabelCaseBuilder()
                .setType1Label(new Type1LabelBuilder().setType1Label(ByteBufUtils.readUint32(buffer)).build())
                .build();
    }

    @Override
    public void serializeLabel(final boolean unidirectional, final boolean global, final LabelType subobject,
            final ByteBuf buffer) {
        checkArgument(subobject instanceof Type1LabelCase,
            "Unknown Label Subobject instance. Passed {}. Needed Type1LabelCase.", subobject.getClass());
        final ByteBuf body = Unpooled.buffer(LABEL_LENGTH);
        final Type1Label type1Label = ((Type1LabelCase) subobject).getType1Label();
        checkArgument(type1Label != null, "Type1Label is mandatory.");
        ByteBufUtils.writeOrZero(body, type1Label.getType1Label());
        LabelUtil.formatLabel(CTYPE, unidirectional, global, body, buffer);
    }
}