'use strict';

// EXAMPLE:
// node bin/dns-parse.js samples/a-0.mdns.bin

// pass a terminal arg
var filename = process.argv[2];
if (!filename) {
  console.error("Usage: node bin/dns-parse.js <path/to/sample.bin>");
  console.error("Example: node bin/dns-parse.js ./samples/services-0.mdns.bin");
  process.exit(1);
}


var PromiseA = require('bluebird');
var fs = PromiseA.promisifyAll(require('fs'));
var pdns = require('../');

fs.readFileAsync(filename, null).then(function (nb) {
  //
  // current reference impl
  //
  //console.log(require('native-dns-packet').parse(nb));


  //
  // other reference impl
  //
  //console.log(require('dns-js').DNSPacket.parse(nb));

  // nb is a Uint8Array (ArrayBufferView) for nb.buffer
  // nb.buffer is the actual ArrayBuffer
  var packet = pdns.unpack(nb.buffer);

  function tryParseRdata(record) {
    record.data = null;
    record.error = null;

    try {
      record.data = pdns.unpackRdata(nb.buffer, packet, record);
    } catch (e) {
      console.error('[Error] unpackRdata: ' + e.message);
      record.error = e;
    }
  }

  packet.answers.forEach(tryParseRdata);
  packet.authority.forEach(tryParseRdata);
  packet.additional.forEach(tryParseRdata);

  console.log('[packet]', nb.byteLength, 'bytes:');
  console.log(JSON.stringify(packet, null, 2));
});