/*
 * 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.isis.io.isispacket.tlv.subtlv;

import com.google.common.base.MoreObjects;
import com.google.common.primitives.Bytes;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onlab.packet.Ip4Address;
import org.onosproject.isis.io.isispacket.tlv.TlvHeader;
import org.onosproject.isis.io.util.IsisUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

/**
 * Representation of interface ip address TE value.
 */
public class InterfaceIpAddress extends TlvHeader implements TrafficEngineeringSubTlv {
    private static final Logger log =
            LoggerFactory.getLogger(InterfaceIpAddress.class);
    private List<Ip4Address> localInterfaceIPAddress = new ArrayList<>();

    /**
     * Creates an instance of local interface ip address.
     *
     * @param header tlv header instance
     */
    public InterfaceIpAddress(TlvHeader header) {
        this.setTlvType(header.tlvType());
        this.setTlvLength(header.tlvLength());
    }

    /**
     * Adds local interface ip address.
     *
     * @param localAddress ip address
     */
    public void addLocalInterfaceIPAddress(Ip4Address localAddress) {
        localInterfaceIPAddress.add(localAddress);
    }

    /**
     * Returns local interface ip address.
     *
     * @return localAddress ip address
     */
    public List<Ip4Address> getLocalInterfaceIPAddress() {
        return localInterfaceIPAddress;
    }

    /**
     * Reads bytes from channel buffer.
     *
     * @param channelBuffer channel buffer instance
     */
    public void readFrom(ChannelBuffer channelBuffer) {
        while (channelBuffer.readableBytes() >= IsisUtil.FOUR_BYTES) {
            byte[] tempByteArray = new byte[IsisUtil.FOUR_BYTES];
            channelBuffer.readBytes(tempByteArray, 0, IsisUtil.FOUR_BYTES);
            this.addLocalInterfaceIPAddress(Ip4Address.valueOf(tempByteArray));
        }
    }

    /**
     * Returns local interface ip address as byte array.
     *
     * @return local interface ip address as byte array
     */
    public byte[] asBytes() {
        byte[] linkSubType = null;
        byte[] linkSubTlvHeader = tlvHeaderAsByteArray();
        byte[] linkSubTlvBody = tlvBodyAsBytes();
        linkSubType = Bytes.concat(linkSubTlvHeader, linkSubTlvBody);

        return linkSubType;
    }

    /**
     * Returns byte array of local interface ip address.
     *
     * @return byte array of local interface ip address
     */
    public byte[] tlvBodyAsBytes() {
        List<Byte> linkSubTypeBody = new ArrayList<>();
        for (Ip4Address remoteAddress : this.localInterfaceIPAddress) {
            linkSubTypeBody.addAll(Bytes.asList(remoteAddress.toOctets()));
        }

        return Bytes.toArray(linkSubTypeBody);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(getClass())
                .omitNullValues()
                .add("localInterfaceIPAddress", localInterfaceIPAddress)
                .toString();
    }
}