/*
 * 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.vpnservice.mdsalutil;

import java.math.BigInteger;

public class MetaDataUtil {
    public static final BigInteger METADATA_MASK_VRFID = new BigInteger("00000000FFFFFFFF", 16);
    public static final BigInteger METADATA_MASK_LPORT_TAG = new BigInteger("1FFFFF0000000000", 16);
    public static final BigInteger METADATA_MASK_SERVICE = new BigInteger("000000FFFF000000", 16);
    public static final BigInteger METADATA_MASK_SERVICE_INDEX = new BigInteger("E000000000000000", 16);
    public static final BigInteger METADATA_MASK_LPORT_WRITE = new BigInteger("00FFFF0000000000", 16);
    public static final BigInteger METADA_MASK_VALID_TUNNEL_ID_BIT_AND_TUNNEL_ID = new BigInteger("08000000FFFFFF00", 16);
    public static final BigInteger METADATA_MASK_LABEL_ITM = new BigInteger("40FFFFFF000000FF", 16);
    public static final BigInteger METADA_MASK_TUNNEL_ID = new BigInteger("00000000FFFFFF00", 16);

    public static BigInteger getMetaDataForLPortDispatcher(int lportTag, short serviceIndex) {
        return getServiceIndexMetaData(serviceIndex).or(getLportTagMetaData(lportTag));
    }

    public static BigInteger getMetaDataForLPortDispatcher(int lportTag, short serviceIndex,
                                                           BigInteger serviceMetaData) {
        return getServiceIndexMetaData(serviceIndex).or(getLportTagMetaData(lportTag)).or(serviceMetaData);
    }

    public static BigInteger getServiceIndexMetaData(int serviceIndex) {
        return new BigInteger("7", 16).and(BigInteger.valueOf(serviceIndex)).shiftLeft(61);
    }

    public static BigInteger getLportTagMetaData(int lportTag) {
        return new BigInteger("1FFFFF", 16).and(BigInteger.valueOf(lportTag)).shiftLeft(40);
    }

    public static BigInteger getMetaDataMaskForLPortDispatcher() {
        return METADATA_MASK_SERVICE_INDEX.or(METADATA_MASK_LPORT_TAG);
    }

    public static BigInteger getMetadataLPort(int lPortTag) {
        return (new BigInteger("FFFF", 16).and(BigInteger.valueOf(lPortTag))).shiftLeft(40);
    }

    public static BigInteger getLportFromMetadata(BigInteger metadata) {
        return (metadata.and(METADATA_MASK_LPORT_TAG)).shiftRight(40);
    }

    public static int getElanTagFromMetadata(BigInteger metadata) {
        return (((metadata.and(MetaDataUtil.METADATA_MASK_SERVICE)).
                shiftRight(24))).intValue();
    }

    public static BigInteger getMetaDataMaskForLPortDispatcher(BigInteger metadataMaskForServiceIndex,
                                                               BigInteger metadataMaskForLPortTag, BigInteger metadataMaskForService) {
        return metadataMaskForServiceIndex.or(metadataMaskForLPortTag).or(metadataMaskForService);
    }

    /**
     * For the tunnel id with VNI and valid-vni-flag set, the most significant byte
     * should have 08. So, shifting 08 to 7 bytes (56 bits) and the result is OR-ed with
     * VNI being shifted to 1 byte.
     */
    public static BigInteger getTunnelIdWithValidVniBitAndVniSet(int vni) {
        return BigInteger.valueOf(0X08).shiftLeft(56).or(BigInteger.valueOf(vni).shiftLeft(8));
    }
}