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/*


*/

var moment = require('moment');
var Parser = require('../parser').Parser;
var ParsedResult = require('../../result').ParsedResult;

var util = require('../../utils/ZH-Hant.js');

var PATTERN = new RegExp(
    '(\\d+|[' + Object.keys(util.NUMBER).join('') + ']+|半|幾)(?:\\s*)' +
    '(?:個)?' +
    '(秒(?:鐘)?|分鐘|小時|鐘|日|天|星期|禮拜|月|年)' +
    '(?:(?:之|過)?後|(?:之)?內)', 'i'
);

var NUMBER_GROUP = 1;
var UNIT_GROUP = 2;

exports.Parser = function ZHHantCasualDateParser() {

    Parser.apply(this, arguments);

    this.pattern = function() {
        return PATTERN;
    };

    this.extract = function(text, ref, match, opt) {
      var index = match.index;
      text  = match[0];

      var result = new ParsedResult({
          index: index,
          text: text,
          ref: ref
      });

      var number = parseInt(match[NUMBER_GROUP]);
      if (isNaN(number)){
        number = util.zhStringToNumber(match[NUMBER_GROUP]);
      }

      if (isNaN(number)){
        var string = match[NUMBER_GROUP];
        if (string === '幾'){
          number = 3;
        }else if(string === '半'){
          number = 0.5;
        }else{

          //just in case
          return null;
        }
      }

      var date = moment(ref);
      var unit = match[UNIT_GROUP];
      var unitAbbr = unit[0];

      if (unitAbbr.match(/[日天星禮月年]/)){
        if(unitAbbr == '日' || unitAbbr == '天'){
          date.add(number, 'd');
        }else if(unitAbbr == '星' || unitAbbr == '禮'){
          date.add(number * 7, 'd');
        }else if(unitAbbr == '月'){
          date.add(number, 'month');
        }else if(unitAbbr == '年'){
          date.add(number, 'year');
        }

        result.start.assign('year', date.year());
        result.start.assign('month', date.month() + 1);
        result.start.assign('day', date.date());
        return result;
      }

      if(unitAbbr == '秒'){
        date.add(number, 'second');
      }else if(unitAbbr == '分'){
        date.add(number, 'minute');
      }else if(unitAbbr == '小' || unitAbbr == '鐘'){
        date.add(number, 'hour');
      }

      result.start.imply('year', date.year());
      result.start.imply('month', date.month() + 1);
      result.start.imply('day', date.date());
      result.start.assign('hour', date.hour());
      result.start.assign('minute', date.minute());
      result.start.assign('second', date.second());
      result.tags.ZHHantDeadlineFormatParser = true;
      return result;
    };
};