(function (exports) {
'use strict';

// Value              Meaning/Use
// Primary NS         Variable length. The name of the Primary Master for the domain. May be a label, pointer, or any combination
// Admin MB           Variable length. The administrator's mailbox. May be a label, pointer, or any combination
// Serial Number      Unsigned 32-bit integer
// Refresh Interval   Unsigned 32-bit integer
// Retry Interval     Unsigned 32-bit integer
// Expiration Limit   Unsigned 32-bit integer
// Minimum TTL        Unsigned 32-bit integer



exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
  if(!record.name_server){
    throw new Error("no name server for SOA record");
  }
  if(!record.email_addr){
    throw new Error("ne email address for SOA record");
  }
  if(!record.sn){
    throw new Error("no serial number for SOA record");
  }
  if(!record.ref){
    throw new Error("no serial number for SOA record");
  }
  if(!record.ret){
    throw new Error("no serial number for SOA record");
  }
  if(!record.ex){
    throw new Error("no serial number for SOA record");
  }
  if(!record.nx){
    throw new Error("no serial number for SOA record");
  }

  var soaLen = 20; // take into account sn, ref, ret, ex, and nx
                  //  (32-bits each. 4Bytes * 5 = 20)
  var rdLenIndex = total;
  total += 2; // Save space for RDLENGTH

  // pack name_server which is a sequence of labels
  record.name_server.split('.').forEach(function(label){
    soaLen += 1 + label.length;

    dv.setUint8(total, label.length, false);
    total += 1;

    label.split('').forEach(function(ch) {
      dv.setUint8(total, ch.charCodeAt(0), false);
      total += 1;
    });
  });

  // pack email address which is a sequence of labels
  record.email_addr.split('.').forEach(function (label){
    soaLen += 1 + label.length;

    dv.setUint8(total, label.length, false);
    total += 1;

    label.split('').forEach(function (ch){
      dv.setUint8(total, ch.charCodeAt(0), false);
      total += 1;
    });
  });

  // pack all 32-bit values
  dv.setUint32(total, parseInt(record.sn, 10), false);
  total+=4;
  dv.setUint32(total, parseInt(record.ref, 10), false);
  total+=4;
  dv.setUint32(total, parseInt(record.ret, 10), false);
  total+=4;
  dv.setUint32(total, parseInt(record.ex, 10), false);
  total+=4;
  dv.setUint32(total, parseInt(record.nx, 10), false);
  total+=4;

  // RDLENGTH
  dv.setUint16(rdLenIndex, soaLen, false);

  return total;
};

}('undefined' !== typeof window ? window : exports));