package org.handwerkszeug.dns.record;

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;

import org.handwerkszeug.dns.NameCompressor;
import org.handwerkszeug.dns.RRType;
import org.handwerkszeug.dns.ResourceRecord;
import org.handwerkszeug.util.AddressUtil;
import org.handwerkszeug.util.CompareUtil;

import io.netty.buffer.ByteBuf;

/**
 * <a href="http://datatracker.ietf.org/doc/rfc3596/">RFC3596</a>
 *
 * @author taichi
 */
public
class AAAARecord extends AbstractRecord<AAAARecord> {

    /**
     * A 128 bit IPv6 address is encoded in the data portion of an AAAA resource
     * record in network byte order (high-order byte first).
     */
    protected byte[] address;

    public
    AAAARecord() {
        super(RRType.AAAA);
    }

    public
    AAAARecord(AAAARecord from) {
        super(from);
        byte[] ary = from.address;
        if (ary != null) {
            this.address = Arrays.copyOf(ary, ary.length);
        }
    }

    @Override
    protected
    void parseRDATA(ByteBuf buffer) {
        byte[] newone = new byte[16];
        buffer.readBytes(newone);
        this.address = newone;
    }

    @Override
    protected
    void writeRDATA(ByteBuf buffer, NameCompressor compressor) {
        buffer.writeBytes(this.address);
    }

    @Override
    protected
    ResourceRecord newInstance() {
        return new AAAARecord(this);
    }

    @Override
    public
    int compareTo(AAAARecord o) {
        if ((this != o) && (super.compareTo(o) == 0)) {
            return CompareUtil.compare(this.address, o.address);
        }
        return 0;
    }

    @Override
    public
    String toString() {
        StringBuilder stb = new StringBuilder();
        stb.append(super.toString());
        stb.append(' ');
        InetAddress ia = address();
        if (ia == null) {
            stb.append("null");
        }
        else {
            stb.append(ia.getHostAddress());
        }
        return stb.toString();
    }

    public
    InetAddress address() {
        try {
            return InetAddress.getByAddress(this.address);
        } catch (UnknownHostException e) {
            return null;
        }
    }

    @Override
    public
    void setRDATA(List<String> list) {
        if (0 < list.size()) {
            String s = list.get(0);
            if (AddressUtil.v6Address.matcher(s)
                                     .matches()) {
                InetAddress addr = AddressUtil.getByName(s);
                this.address = addr.getAddress();
            }
        }
        else {
            // TODO error message.
            throw new IllegalArgumentException();
        }
    }

    public
    void address(Inet6Address v6address) {
        this.address = v6address.getAddress();
    }
}