package org.handwerkszeug.dns.record;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

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

import io.netty.buffer.ByteBuf;

/**
 * 3.3.14. TXT RDATA format
 *
 * @author taichi
 */
public
class TXTRecord extends AbstractRecord<TXTRecord> {

    protected List<byte[]> strings;

    public
    TXTRecord() {
        super(RRType.TXT);
    }

    public
    TXTRecord(TXTRecord from) {
        super(from);
        if (from.strings != null) {
            List<byte[]> newone = new ArrayList<byte[]>(from.strings.size());
            for (byte[] b : from.strings) {
                newone.add(Arrays.copyOf(b, b.length));
            }
        }
    }

    @Override
    protected
    void parseRDATA(ByteBuf buffer) {
        this.strings = new ArrayList<byte[]>();
        ByteBuf part = buffer.readSlice(rdlength());
        while (part.isReadable()) {
            this.strings.add(readString(part));
        }
    }

    @Override
    protected
    void writeRDATA(ByteBuf buffer, NameCompressor compressor) {
        for (byte[] ary : this.strings) {
            writeString(buffer, ary);
        }
    }

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

    @Override
    public
    int compareTo(TXTRecord o) {
        if (this == o) {
            return 0;
        }
        int result = super.compareTo(o);
        if (result != 0) {
            return result;
        }
        int mySize = this.strings.size();
        int yrSize = o.strings.size();
        int min = Math.min(mySize, yrSize);
        for (int i = 0; i < min; i++) {
            result = CompareUtil.compare(this.strings.get(i), o.strings.get(i));
            if (result != 0) {
                return result;
            }
        }
        return mySize - yrSize;
    }

    @Override
    public
    String toString() {
        StringBuilder stb = new StringBuilder();
        for (Iterator<byte[]> i = this.strings.iterator(); i.hasNext(); ) {
            stb.append(toQuoteString(i.next()));
            if (i.hasNext()) {
                stb.append(' ');
            }
        }
        return stb.toString();
    }

    @Override
    public
    void setRDATA(List<String> list) {
        for (String s : list) {
            this.strings.add(s.getBytes());
        }
    }

    public
    String txt() {
        return this.toString();
    }
}