(function (exports) {
'use strict';

// TODO. Not yet implemented

// Value: Preference
// Meaning/Use: Unsigned 16-bit integer
//-------------------------------------
// Value: Mail Exchanger
// Meaning/Use: The name host name that provides the service.
// May be a label, pointer or any combination

// ab is arrayBuffer, packet is Object, Record is Object
var unpackLabels = exports.DNS_UNPACK_LABELS || require('./dns.unpack-labels.js').DNS_UNPACK_LABELS;
exports.DNS_TYPE_MX = function (ab, packet, record) {


    var rdataAb = ab.slice(record.rdstart, record.rdstart + record.rdlength)
    var dv = new DataView(rdataAb);
    var data = '';

    var s = {
       priority:    ''  // also known as preference
     , exchange:    ''  //     
        
    };
    var temp = ''
    var stuff = '';
    console.log("dataview length: " + dv.byteLength);
    for (var i = 0; i < dv.byteLength; i += 1) {
        

        // console.log(dv.getUint8(i, false.toString(16)));        
        //Priority is the first two bytes
        if (i < 2){

            s.priority += dv.getUint8(i, false).toString(10);

            // take off an padded zeros
            if (s.priority.substr(0, 1) === '0') {

                s.priority = s.priority.slice(1, s.priority.length);

            }
            
        } else {


            // get data from uint8 array
            data = dv.getUint8(i, false);
            // get the string from the data
            temp = String.fromCharCode(data);
            console.log("data at index " + i + ":" + temp);
            
            // I need to place the '.' in the correct place. This is wrong though.
            if ((temp.trim() === ''  && i > 2) /*|| (!temp.match(/^[a-zA-Z0-9._-]+$/) && i > 2)*/) {
                s.exchange += ".";
            }

            // filter out everything that isn't a valid character
            temp = temp.match(/^[a-zA-Z0-9._-]+$/);

            // if temp is null, do nothing
            if (temp === null){

                // otherwise, append to s.exchange
            }else{

                s.exchange += temp;

            }

        }
    }

    // the below code returns an empty string. 
    
    s.exchange = unpackLabels(new Uint8Array(ab), record.rdstart+2, { byteLength: 0, cpcount: 0, labels: [], name: '' }).labels;

    return s;


};

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