// Copyright 2011 Timothy J Fontaine <tjfontaine@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE

'use strict';

function reverse_map(src) {
  var dst = {},
      k;

  for (k in src) {
    if (src.hasOwnProperty(k)) {
      dst[src[k]] = k;
    }
  }
  return dst;
}

/* http://www.iana.org/assignments/dns-parameters */
var NAME_TO_QTYPE = exports.NAME_TO_QTYPE = {
  A: 1,
  NS: 2,
  MD: 3,
  MF: 4,
  CNAME: 5,
  SOA: 6,
  MB: 7,
  MG: 8,
  MR: 9,
  'NULL': 10,
  WKS: 11,
  PTR: 12,
  HINFO: 13,
  MINFO: 14,
  MX: 15,
  TXT: 16,
  RP: 17,
  AFSDB: 18,
  X25: 19,
  ISDN: 20,
  RT: 21,
  NSAP: 22,
  'NSAP-PTR': 23,
  SIG: 24,
  KEY: 25,
  PX: 26,
  GPOS: 27,
  AAAA: 28,
  LOC: 29,
  NXT: 30,
  EID: 31,
  NIMLOC: 32,
  SRV: 33,
  ATMA: 34,
  NAPTR: 35,
  KX: 36,
  CERT: 37,
  A6: 38,
  DNAME: 39,
  SINK: 40,
  OPT: 41,
  APL: 42,
  DS: 43,
  SSHFP: 44,
  IPSECKEY: 45,
  RRSIG: 46,
  NSEC: 47,
  DNSKEY: 48,
  DHCID: 49,
  NSEC3: 50,
  NSEC3PARAM: 51,
  TLSA: 52,
  HIP: 55,
  NINFO: 56,
  RKEY: 57,
  TALINK: 58,
  CDS: 59,
  SPF: 99,
  UINFO: 100,
  UID: 101,
  GID: 102,
  UNSPEC: 103,
  TKEY: 249,
  TSIG: 250,
  IXFR: 251,
  AXFR: 252,
  MAILB: 253,
  MAILA: 254,
  ANY: 255,
  URI: 256,
  CAA: 257,
  TA: 32768,
  DLV: 32769
};
exports.QTYPE_TO_NAME = reverse_map(NAME_TO_QTYPE);

exports.nameToQtype = function(n) {
  return NAME_TO_QTYPE[n.toUpperCase()];
};

exports.qtypeToName = function(t) {
  return exports.QTYPE_TO_NAME[t];
};

var NAME_TO_QCLASS = exports.NAME_TO_QCLASS = {
  IN: 1
};
exports.QCLASS_TO_NAME = reverse_map(NAME_TO_QCLASS);

exports.FAMILY_TO_QTYPE = {
  4: NAME_TO_QTYPE.A,
  6: NAME_TO_QTYPE.AAAA
};
exports.QTYPE_TO_FAMILY = {};
exports.QTYPE_TO_FAMILY[exports.NAME_TO_QTYPE.A] = 4;
exports.QTYPE_TO_FAMILY[exports.NAME_TO_QTYPE.AAAA] = 6;

exports.NAME_TO_RCODE = {
  NOERROR: 0,
  FORMERR: 1,
  SERVFAIL: 2,
  NOTFOUND: 3,
  NOTIMP: 4,
  REFUSED: 5,
  YXDOMAIN: 6, //Name Exists when it should not
  YXRRSET: 7, //RR Set Exists when it should not
  NXRRSET: 8, //RR Set that should exist does not
  NOTAUTH: 9,
  NOTZONE: 10,
  BADVERS: 16,
  BADSIG: 16, // really?
  BADKEY: 17,
  BADTIME: 18,
  BADMODE: 19,
  BADNAME: 20,
  BADALG: 21,
  BADTRUNC: 22
};
exports.RCODE_TO_NAME = reverse_map(exports.NAME_TO_RCODE);

exports.BADNAME = 'EBADNAME';
exports.BADRESP = 'EBADRESP';
exports.CONNREFUSED = 'ECONNREFUSED';
exports.DESTRUCTION = 'EDESTRUCTION';
exports.REFUSED = 'EREFUSED';
exports.FORMERR = 'EFORMERR';
exports.NODATA = 'ENODATA';
exports.NOMEM = 'ENOMEM';
exports.NOTFOUND = 'ENOTFOUND';
exports.NOTIMP = 'ENOTIMP';
exports.SERVFAIL = 'ESERVFAIL';
exports.TIMEOUT = 'ETIMEOUT';