var helpers = require("../helpers.js")

/*
  ZDA Time & Date – UTC, Day, Month, Year and Local Time Zone
          1         2 3   4   5   6 7
          |         | |   |   |   | |
  $--ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh
  1) Local zone minutes description, same sign as local hours
  2) Local zone description, 00 to +/- 13 hours
  3) Year
  4) Month, 01 to 12
  5) Day, 01 to 31
  6) Time (UTC)
  7) Checksum
 */

exports.ID = 'ZDA';
exports.TYPE = 'time-zone';

exports.decode = function(fields) {
  return {
    sentence: exports.ID,
    type: exports.TYPE,
    timestamp: fields[1],
    day: fields[2],
    month: fields[3],
    year: fields[4],
    ltzh: fields[5],
    ltzn: fields[6]
  };
}

exports.encode = function (talker, msg) {
  var result = ['$' + talker + exports.ID];
  var { date } = msg
  result.push(helpers.padLeft(date.getHours().toString(), 2, '0') + helpers.padLeft(date.getMinutes().toString(), 2, '0') + helpers.padLeft(date.getSeconds().toString(), 2, '0') + '.000');
  result.push(helpers.padLeft(date.getDate().toString(), 2, '0'));
  result.push(helpers.padLeft((date.getMonth() + 1).toString(), 2, '0'));
  result.push(date.getFullYear().toString());
  result.push('00');
  result.push('00');

  var resultMsg = result.join(',');
  return resultMsg + helpers.computeChecksum(resultMsg);
}