package org.handwerkszeug.dns.record;

import java.net.InetAddress;
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;

/**
 * 3.4.1. A RDATA format
 *
 * @author taichi
 */
public
class ARecord extends AbstractRecord<ARecord> {

    /**
     * A 32 bit Internet address.
     */
    protected long address;

    public
    ARecord() {
        super(RRType.A);
    }

    public
    ARecord(ARecord from) {
        super(from);
        this.address = from.address;
    }

    @Override
    protected
    void parseRDATA(ByteBuf buffer) {
        this.address = buffer.readUnsignedInt();
    }

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

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

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

    @Override
    public
    int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + (int) (this.address ^ (this.address >>> 32));
        return result;
    }

    @Override
    public
    boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        ARecord other = (ARecord) obj;
        if (this.address != other.address) {
            return false;
        }
        return true;
    }

    @Override
    public
    String toString() {
        StringBuilder stb = new StringBuilder();
        stb.append(super.toString());
        stb.append(' ');
        stb.append(this.address()
                       .getHostAddress());
        return stb.toString();
    }

    public
    InetAddress address() {
        return AddressUtil.getByAddress(this.address);
    }

    @Override
    public
    void setRDATA(List<String> list) {
        if (0 < list.size()) {
            String s = list.get(0);
            if (AddressUtil.v4Address.matcher(s)
                                     .matches()) {
                InetAddress addr = AddressUtil.getByName(s);
                this.address = AddressUtil.toLong(addr);
            }
        }
        else {
            // TODO error message.
            throw new IllegalArgumentException();
        }
    }

    public
    void address(InetAddress v4address) {
        this.address = AddressUtil.toLong(v4address);
    }
}