/*
 * Copyright 2016-present Open Networking Laboratory
 *
 * 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 org.onosproject.lisp.msg.types;

import java.util.Objects;

import static com.google.common.base.MoreObjects.toStringHelper;

/**
 * Source/Dest key type LCAF address class.
 * Source destination key type is defined in draft-ietf-lisp-lcaf-13
 * https://tools.ietf.org/html/draft-ietf-lisp-lcaf-13#page-18
 *
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |           AFI = 16387         |     Rsvd1     |     Flags     |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |   Type = 12   |     Rsvd2     |             4 + n             |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |            Reserved           |   Source-ML   |    Dest-ML    |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |              AFI = x          |         Source-Prefix ...     |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |              AFI = x          |     Destination-Prefix ...    |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */
public class LispSourceDestLcafAddress extends LispLcafAddress {

    private LispAfiAddress srcPrefix;
    private LispAfiAddress dstPrefix;
    private final byte srcMaskLength;
    private final byte dstMaskLength;
    private final short reserved;

    /**
     * Initializes source/dest key type LCAF address.
     */
    public LispSourceDestLcafAddress() {
        super(LispCanonicalAddressFormatEnum.SOURCE_DEST);
        srcMaskLength = 0;
        dstMaskLength = 0;
        reserved = 0;
    }

    /**
     * Initializes source/dest key type LCAF address.
     *
     * @param reserved reserved
     * @param srcMaskLength source mask length
     * @param dstMaskLength destination mask length
     * @param srcPrefix source address prefix
     * @param dstPrefix destination address prefix
     */
    public LispSourceDestLcafAddress(short reserved, byte srcMaskLength,
                                     byte dstMaskLength,
                                     LispAfiAddress srcPrefix,
                                     LispAfiAddress dstPrefix) {
        super(LispCanonicalAddressFormatEnum.SOURCE_DEST);
        this.reserved = reserved;
        this.srcMaskLength = srcMaskLength;
        this.dstMaskLength = dstMaskLength;
        this.srcPrefix = srcPrefix;
        this.dstPrefix = dstPrefix;
    }

    /**
     * Obtains source address prefix.
     *
     * @return source address prefix
     */
    public LispAfiAddress getSrcPrefix() {
        return srcPrefix;
    }

    /**
     * Obtains destination address prefix.
     *
     * @return destination address prefix
     */
    public LispAfiAddress getDstPrefix() {
        return dstPrefix;
    }

    /**
     * Obtains source mask length.
     *
     * @return source mask length
     */
    public byte getSrcMaskLength() {
        return srcMaskLength;
    }

    /**
     * Obtains destination mask length.
     *
     * @return destination mask length
     */
    public byte getDstMaskLength() {
        return dstMaskLength;
    }

    /**
     * Obtains reserved value.
     *
     * @return reserved value
     */
    public short getReserved() {
        return reserved;
    }

    @Override
    public int hashCode() {
        return Objects.hash(srcPrefix, dstPrefix, srcMaskLength, dstMaskLength, reserved);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (obj instanceof LispSourceDestLcafAddress) {
            final LispSourceDestLcafAddress other = (LispSourceDestLcafAddress) obj;
            return Objects.equals(this.srcPrefix, other.srcPrefix) &&
                   Objects.equals(this.dstPrefix, other.dstPrefix) &&
                   Objects.equals(this.srcMaskLength, other.srcMaskLength) &&
                   Objects.equals(this.dstMaskLength, other.dstMaskLength) &&
                   Objects.equals(this.reserved, other.reserved);
        }
        return false;
    }

    @Override
    public String toString() {
        return toStringHelper(this)
                .add("source prefix", srcPrefix)
                .add("destination prefix", dstPrefix)
                .add("source mask length", srcMaskLength)
                .add("destination mask length", dstMaskLength)
                .add("reserved", reserved)
                .toString();
    }
}