/*
 * $Id$
 * 
 * Copyright (c) 2005 VeriSign. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. 3. The name of the author may not
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *  
 */

package com.verisignlabs.dnssec.security;

import org.xbill.DNS.*;
import org.xbill.DNS.utils.base16;
import org.xbill.DNS.utils.base32;

public class ProtoNSEC3
{
  private Name    originalOwner;
  private boolean optInFlag;
  private byte    hashAlg;
  private int     iterations;
  private byte[]  salt;
  private byte[]  next;
  private byte[]  owner;        // cached numerical owner value.
  private TypeMap typemap;
  private Name    zone;
  private Name    name;
  private int     dclass;
  private long    ttl;

  /**
   * Creates an NSEC3 Record from the given data.
   * 
   * @param originalOwner TODO
   * @param next The following name in an ordered list of the zone
   * @param types An array containing the types present.
   */
  public ProtoNSEC3(byte[] owner, Name originalOwner, Name zone, int dclass,
      long ttl, boolean optInFlag, byte hashAlg, int iterations, byte[] salt,
      byte[] next, TypeMap typemap)
  {
    this.zone = zone;
    this.owner = owner;
    this.dclass = dclass;
    this.ttl = ttl;
    this.optInFlag = optInFlag;
    this.hashAlg = hashAlg;
    this.iterations = iterations;
    this.salt = salt;
    this.next = next;
    this.typemap = typemap;
    this.originalOwner = originalOwner;
  }

  public ProtoNSEC3(byte[] owner, Name originalOwner, Name zone, int dclass,
      long ttl, boolean optInFlag, byte hashAlg, int iterations, byte[] salt,
      byte[] next, int[] types)
  {
    this(owner, originalOwner, zone, dclass, ttl, optInFlag, hashAlg,
        iterations, salt, next, TypeMap.fromTypes(types));
  }

  private String hashToString(byte[] hash)
  {
    if (hash == null) return null;
    return base32.toString(hash).toLowerCase();
  }

  public Name getName()
  {
    if (name == null)
    {
      try
      {
        name = new Name(hashToString(owner), zone);
      }
      catch (TextParseException e)
      {
        // This isn't going to happen.
      }
    }

    return name;
  }

  public byte[] getNext()
  {
    return next;
  }

  public void setNext(byte[] next)
  {
    this.next = next;
  }

  public boolean getOptInFlag()
  {
    return optInFlag;
  }

  public void setOptInFlag(boolean optInFlag)
  {
    this.optInFlag = optInFlag;
  }

  public long getTTL()
  {
    return ttl;
  }

  public void setTTL(long ttl)
  {
    this.ttl = ttl;
  }

  public TypeMap getTypemap()
  {
    return typemap;
  }

  public int[] getTypes()
  {
    return typemap.getTypes();
  }

  public void setTypemap(TypeMap typemap)
  {
    this.typemap = typemap;
  }

  public int getDClass()
  {
    return dclass;
  }

  public byte getHashAlgorithm()
  {
    return hashAlg;
  }

  public int getIterations()
  {
    return iterations;
  }

  public byte[] getOwner()
  {
    return owner;
  }

  public byte[] getSalt()
  {
    return salt;
  }

  public Name getZone()
  {
    return zone;
  }

  public NSEC3Record getNSEC3Record()
  {
    String comment = (originalOwner == null)
        ? "(unknown original ownername)"
        : originalOwner.toString();
    return new NSEC3Record(getName(), dclass, ttl, optInFlag, hashAlg,
        iterations, salt, next, getTypes(), comment);
  }

  public void mergeTypes(TypeMap new_types)
  {
    int[] nt = new_types.getTypes();
    for (int i = 0; i < nt.length; i++)
    {
      if (!typemap.get(nt[i])) typemap.set(nt[i]);
    }
  }

  public int compareTo(ProtoNSEC3 o)
  {
    if (o == null) return 1;
    byte[] o_owner = o.getOwner();
    int len = owner.length < o_owner.length ? o_owner.length : owner.length;
    for (int i = 0; i < len; i++)
    {
      int d = ((owner[i] & 0xFF) - (o_owner[i] & 0xFF));
      if (d != 0) return d;
    }
    return owner.length - o_owner.length;
  }

  public String toString()
  {
    StringBuffer sb = new StringBuffer();
    sb.append(getName());
    sb.append(' ');
    sb.append(ttl);
    sb.append(' ');
    sb.append(DClass.string(dclass));
    sb.append(" NSEC3 ");
    sb.append(optInFlag ? '1' : '0');
    sb.append(' ');
    sb.append(hashAlg);
    sb.append(' ');
    sb.append(iterations);
    sb.append(' ');
    sb.append(salt == null ? "-" : base16.toString(salt));
    sb.append(' ');
    String nextstr = (next == null) ? "(null)" : base32.toString(next)
        .toLowerCase();
    sb.append(nextstr);

    int[] types = getTypes();
    for (int i = 0; i < types.length; i++)
    {
      sb.append(" ");
      sb.append(Type.string(types[i]));
    }
    if (originalOwner != null) sb.append(" ; " + originalOwner);

    return sb.toString();
  }

  public static class Comparator implements java.util.Comparator
  {

    public int compare(Object o1, Object o2)
    {
      return ((ProtoNSEC3) o1).compareTo((ProtoNSEC3) o2);
    }

  }
}