angular.module('newApp')

  .factory('dateUtil', function() {

    var symbolMap = {

      'MM': function(date) {

        if (typeof(date) === 'string') {

          var d = new Date(date);

          return d.getMonth();

        }

        return date.getMonth() + 1;

      },

      'mm': function(date) {

        if (typeof(date) === 'string') {

          var d = new Date(date);

          return d.getMinutes();

        }

        return date.getMinutes();

      },

      'YY': function(date) {

        if (typeof(date) === 'string') {

          var d = new Date(date);

          return d.getFullYear();

        }

        return date.getFullYear();

      },

      'ss': function(date) {

        if (typeof(date) === 'string') {

          var d = new Date(date);

          return d.getSeconds();

        }

        return date.getSeconds();

      },

      'hh': function(date) {

        if (typeof(date) === 'string') {

          var d = new Date(date);

          return d.getHours();

        }

        return date.getHours();

      },

      'dd': function(date) {

        if (typeof(date) === 'string') {

          var d = new Date(date);

          return d.getDate();

        }

        return date.getDate();

      }

    };

    function _makeNchar(char, n) {

      var str = [];

      while (n--) {

        str.push(char);

      }

      return str.join('');

    }

    function alignNumber(num, len, char) {

      num = num + '';

      if (num.length > len) {

        return num;

      } else {

        return _makeNchar(char, len - num.length) + num;

      }

    }

    function getRelativeDate(offset, date) {

      var relativeDate = new Date(date),

        dateValue = relativeDate.getDate() + offset;

      relativeDate.setDate(dateValue);

      return relativeDate;

    }return {

      format: function(date, fmtStr) {

        if (fmtStr) {

          return fmtStr.replace((/(MM|mm|YY|ss|hh|dd)/g), function(s) {

            return alignNumber(symbolMap[s](date), 2, '0');

          });

        }

      },

      getRelativeDate: getRelativeDate

    };

  });