;(function() {
  var root = this;

  ///////////////////////////////////////////////////
  //
  // lunarInfo
  //
  ///////////////////////////////////////////////////

  // base data about chinese year informace
  // 保存公历农历之间的转换信息:以任意一年作为起点，
  // 把从这一年起若干年(依需要而定)的农历信息保存起来。 要保存一年的信息，只要两个信息就够了: 1)农历每个月的大小;2)今年是否有闰月，闰几月以及闰月的大小。 用一个整数来保存这些信息就足够了。 具体的方法是:用一位来表示一个月的大小，大月记为1，小月记为0，
  // 这样就用掉12位(无闰月)或13位(有闰月)，再用高四位来表示闰月的月份，没有闰月记为0。 ※-----例----: 2000年的信息数据是0xc96，化成二进制就是110010010110B，
  // 表示的含义是:1、2、5、8、10、11月大，其余月份小。 2001年的农历信息数据是0x1a95(因为闰月，所以有13位)，
  // 具体的就是1、2、4、5、8、10、12月大， 其余月份小(0x1a95=1101010010101B)，
  // 4月的后面那一个0表示的是闰4月小，接着的那个1表示5月大。 这样就可以用一个数组来保存这些信息。在这里用数组lunarInfo[]来保存这些信息
  var lunarInfo=new Array(
  0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,
  0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,
  0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,
  0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,
  0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,
  0x1ab54,0x02b60,0x09570,0x052f2,0x04970,
  0x06566,0x0d4a0,0x0ea50,0x06e95,0x05ad0,
  0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,
  0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,
  0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,
  0x06ca0,0x0b550,0x15355,0x04da0,0x0a5d0,
  0x14573,0x052d0,0x0a9a8,0x0e950,0x06aa0,
  0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,
  0x05260,0x0f263,0x0d950,0x05b57,0x056a0,
  0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,
  0x0d250,0x0d558,0x0b540,0x0b5a0,0x195a6,
  0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,
  0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,
  0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,
  0x06b58,0x055c0,0x0ab60,0x096d5,0x092e0,
  0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,
  0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,
  0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,
  0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,
  0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,
  0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,
  0x05aa0,0x076a3,0x096d0,0x04bd7,0x04ad0,
  0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,
  0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,
  0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0);

  var Gan=new Array("甲","乙","丙","丁","戊","己","庚","辛","壬","癸");
  var Zhi=new Array("子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥");
  var Animals=new Array("鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪");
  // TODO is it need to do
  var sTermInfo = new Array(0,21208,42467,63836,85337,107014,128867,150921,173149,195551,218072,240693,263343,285989,308563,331033,353350,375494,397447,419210,440795,462224,483532,504758);
  var nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十');
  var nStr2 = new Array('初','十','廿','卅','□');
  // var monthName = new Array("JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC");
  var cmonthName = new Array('正','二','三','四','五','六','七','八','九','十','十一','腊');

  //公历节日 *表示放假日
  var sFtv = new Array(
  "0101*元旦",
  "0214 情人节",
  "0308 妇女节",
  "0312 植树节",
  "0401 愚人节",
  "0422 地球日",
  "0501 劳动节",
  "0504 青年节",
  "0531 无烟日",
  "0601 儿童节",
  "0606 爱眼日",
  "0701 建党日",
  "0707 抗战纪念日",
  "0801 建军节",
  "0910 教师节",
  "0918 九·一八事变纪念日",
  "1001*国庆节",
  "1031 万圣节",
  "1111 光棍节",
  "1201 艾滋病日",
  "1213 南京大屠杀纪念日",
  "1224 平安夜",
  "1225 圣诞节");

  //某月的第几个星期几。 5,6,7,8 表示到数第 1,2,3,4 个星期几
  var wFtv = new Array(
  //一月的最后一个星期日（月倒数第一个星期日）
  "0520 母亲节",
  "0630 父亲节",
  "1144 感恩节");

  //农历节日
  var lFtv = new Array(
  "0101*春节",
  "0115 元宵节",
  "0202 龙抬头",
  "0505 端午节",
  "0707 七夕",
  "0715 中元节",
  "0815 中秋节",
  "0909 重阳节",
  "1208 腊八节",
  "1223 小年",
  "0100*除夕");

  //====================================== 返回农历 y年的总天数
  function lYearDays(y) {
    var i, sum = 348
    for(i=0x8000; i>0x8; i>>=1) sum += (lunarInfo[y-1900] & i)? 1: 0
    return(sum+leapDays(y))
  }

  //====================================== 返回农历 y年的闰月的天数
  function leapDays(y) {
    if(leapMonth(y)) return((lunarInfo[y-1900] & 0x10000)? 30: 29)
    else return(0)
  }

  //====================================== 返回农历 y年闰哪个月 1-12，没闰返回 0
  function leapMonth(y) {
    return(lunarInfo[y-1900] & 0xf)
  }

  //====================================== 返回农历 y年m月的总天数
  function monthDays(y,m) {
    return( (lunarInfo[y-1900] & (0x10000>>m))? 30: 29 )
  }

  //====================================== 算出农历，传入日期对象，返回农历日期日期对象
  // 该对象属性有 .year .month .day .isLeap .yearCyl .dayCyl .monCyl
  function Lunar(date) {
    var objDate = new Date(date.getFullYear(), date.getMonth(), date.getDate());
    var i, leap=0, temp=0
    var baseDate = new Date(1900,0,31)
    // Mac和linux平台的firefox在此处会产生浮点数错误
    var offset = Math.round((objDate - baseDate)/86400000)

    this.dayCyl = offset + 40
    this.monCyl = 14

    for(i=1900; i<2050 && offset>0; i++) {
      temp = lYearDays(i)
      offset -= temp
      this.monCyl += 12
    }

    if(offset<0) {
      offset += temp;
      i--;
      this.monCyl -= 12
    }

    this.year = i
    this.yearCyl = i-1864

    leap = leapMonth(i) //闰哪个月
    this.isLeap = false

    for(i=1; i<13 && offset>0; i++) {
    //闰月
      if(leap>0 && i==(leap+1) && this.isLeap==false)
      { --i; this.isLeap = true; temp = leapDays(this.year); }
      else
      { temp = monthDays(this.year, i); }

      //解除闰月
      if(this.isLeap==true && i==(leap+1)) this.isLeap = false

      offset -= temp
      if(this.isLeap == false) this.monCyl ++
    }

    if(offset==0 && leap>0 && i==leap+1)
    if(this.isLeap)
    { this.isLeap = false; }
    else
    { this.isLeap = true; --i; --this.monCyl;}

    if(offset<0){ offset += temp; --i; --this.monCyl; }

    this.month = i
    this.day = offset + 1
  }

  ///////////////////////////////////////////////////////////
  //
  // lunar 2 solar
  //
  ///////////////////////////////////////////////////////////
  // year .month .day .isLeap .yearCyl .dayCyl .monCyl
  function Solar(date, isLeapMonth) {
    var lyear = date.getFullYear(),
      lmonth = date.getMonth() + 1,
      lday = date.getDate(),
      offset = 0,
      leap = isLeap(lyear);

    // increment year
    for(var i = 1900; i < lyear; i++) {
      offset += lYearDays(i);
    }

    // increment month
    // add days in all months up to the current month
    for (var i = 1; i < lmonth; i++) {
      // add extra days for leap month
      if (i == leapMonth(lyear)) {
        offset += leapDays(lyear);
      }
      offset += monthDays(lyear, i);
    }
    // if current month is leap month, add days in normal month
    if (leap && isLeapMonth) {
      offset += monthDays(lyear, i);
    }

    // increment
    offset += parseInt(lday) - 1;

    var baseDate = new Date(1900,0,31);
    var solarDate = new Date(baseDate.valueOf() + offset * 86400000);

    this.year = solarDate.getFullYear();
    this.month = solarDate.getMonth();
    this.day = solarDate.getDate();
    this.isLeap = leap;
  }

  function isLeap(year) {
      return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
  }

  function getAnimalYear(year) {
    return Animals[((year - 1900)%12)];
  }


  //============================== 传入 offset 返回干支, 0=甲子
  function cyclical(num) {
    return(Gan[num%10]+Zhi[num%12]);
  }
  //======================================= 返回该年的复活节(春分后第一次满月周后的第一主日)
  function easter(y) {

    var term2=sTerm(y,5); //取得春分日期
    var dayTerm2 = new Date(Date.UTC(y,2,term2,0,0,0,0)); //取得春分的公历日期控件(春分一定出现在3月)
    var lDayTerm2 = new Lunar(dayTerm2); //取得取得春分农历

    if(lDayTerm2.day<15) //取得下个月圆的相差天数
       var lMlen= 15-lDayTerm2.day;
    else
       var lMlen= (lDayTerm2.isLeap? leapDays(y): monthDays(y,lDayTerm2.month)) - lDayTerm2.day + 15;

    //一天等于 1000*60*60*24 = 86400000 毫秒
    var l15 = new Date(dayTerm2.getTime() + 86400000*lMlen ); //求出第一次月圆为公历几日
    var dayEaster = new Date(l15.getTime() + 86400000*( 7-l15.getUTCDay() ) ); //求出下个周日

    this.m = dayEaster.getUTCMonth();
    this.d = dayEaster.getUTCDate();

  }

  //====================== 中文日期
  function getCDay(d){
    var s;

    switch (d) {
       case 10:
          s = '初十'; break;
       case 20:
          s = '二十'; break;
          break;
       case 30:
          s = '三十'; break;
          break;
       default :
          s = nStr2[Math.floor(d/10)];
          s += nStr1[d%10];
    }
    return(s);
  }

  ////////////////////////////////////////////////////////////////
  //
  // 24 节气
  //
  ///////////////////////////////////////////////////////////////
  var solarTerm = new Array("小寒","大寒","立春","雨水","惊蛰","春分","清明",
  "谷雨","立夏","小满","芒种","夏至","小暑","大暑","立秋","处暑","白露","秋分",
  "寒露","霜降","立冬","小雪","大雪","冬至");

  var solarTermBase = new Array(4,19,3,18,4,19,4,19,4,20,4,20,6,22,6,22,6,22,7,22,6,21,6,21);
  var solarTermIdx = '0123415341536789:;<9:=<>:=1>?012@015@015@015AB78CDE8CD=1FD01GH01GH01IH01IJ0KLMN;LMBEOPDQRST0RUH0RVH0RWH0RWM0XYMNZ[MB\\]PT^_ST`_WH`_WH`_WM`_WM`aYMbc[Mde]Sfe]gfh_gih_Wih_WjhaWjka[jkl[jmn]ope]qph_qrh_sth_W';
  var solarTermOS = '211122112122112121222211221122122222212222222221222122222232222222222222222233223232223232222222322222112122112121222211222122222222222222222222322222112122112121222111211122122222212221222221221122122222222222222222222223222232222232222222222222112122112121122111211122122122212221222221221122122222222222222221211122112122212221222211222122222232222232222222222222112122112121111111222222112121112121111111222222111121112121111111211122112122112121122111222212111121111121111111111122112122112121122111211122112122212221222221222211111121111121111111222111111121111111111111111122112121112121111111222111111111111111111111111122111121112121111111221122122222212221222221222111011111111111111111111122111121111121111111211122112122112121122211221111011111101111111111111112111121111121111111211122112122112221222211221111011111101111111110111111111121111111111111111122112121112121122111111011111121111111111111111011111111112111111111111011111111111111111111221111011111101110111110111011011111111111111111221111011011101110111110111011011111101111111111211111001011101110111110110011011111101111111111211111001011001010111110110011011111101111111110211111001011001010111100110011011011101110111110211111001011001010011100110011001011101110111110211111001010001010011000100011001011001010111110111111001010001010011000111111111111111111111111100011001011001010111100111111001010001010000000111111000010000010000000100011001011001010011100110011001011001110111110100011001010001010011000110011001011001010111110111100000010000000000000000011001010001010011000111100000000000000000000000011001010001010000000111000000000000000000000000011001010000010000000';

  // 形式如function sTerm(year, n)，用来计算某年的第n个节气（从0小寒算起）为几号，这也基本被认可为节气计算的基本形式。由于没个月份有两个节气，计算时需要调用两次（n和n+1）
  //===== 某年的第n个节气为几日（从0小寒起算）
  function sTerm(y,n) {
    return(solarTermBase[n] +  Math.floor( solarTermOS.charAt( ( Math.floor(solarTermIdx.charCodeAt(y-1900)) - 48) * 24 + n  ) ) );
  }
  /////////////////////////////////////////////////////////////////
  //
  //  calElement model
  //
  /////////////////////////////////////////////////////////////////

  //============================== 阴历属性
  function calElement(sYear,sMonth,sDay,week,lYear,lMonth,lDay,isLeap,cYear,cMonth,cDay) {
    //瓣句
    this.sYear      = sYear;   //公元年4位数字
    this.sMonth     = sMonth;  //公元月数字
    this.sDay       = sDay;    //公元日数字
    this.week       = week;    //星期, 1个中文
    //农历
    this.lYear      = lYear;   //公元年4位数字
    this.lMonth     = lMonth;  //农历月数字
    this.lDay       = lDay;    //农历日数字
    this.isLeap     = isLeap;  //是否为农历闰月?
    //八字
    this.cYear      = cYear;   //年柱, 2个中文
    this.cMonth     = cMonth;  //月柱, 2个中文
    this.cDay       = cDay;    //日柱, 2个中文

    this.lunarDay      = getCDay(lDay);
    this.lunarMonth    = cmonthName[lMonth - 1];
    this.lunarYear     = getAnimalYear(lYear);

    // this.color      = '';

    this.lunarFestival = ''; //农历节日
    this.solarFestival = ''; //公历节日
    this.solarTerms    = ''; //节气
  }
  ///////////////////////////////////////////////////////////////
  //
  //  main
  //
  ///////////////////////////////////////////////////////////////
  // date's month should be --, example: 2012-5-21 -> new Date(2012, 4, 21)
  // no matter solar or lunar
  function CalendarConverter() {
    this.solar2lunar = function(date) {
      var sYear = date.getFullYear(),
        sMonth = date.getMonth(),
        sDay = date.getDate(),
        weekDay = nStr1[date.getDay()],
        lunar = new Lunar(date),
        lunarYear = lunar.year,
        lunarMonth = lunar.month,
        lunarDay = lunar.day,
        isLeap = lunar.isLeap;

      return addFstv(sYear, sMonth, sDay, weekDay, lunarYear, lunarMonth, lunarDay, isLeap);
    }

    this.lunar2solar = function(date, isLeapMonth) {
      var lunarYear = date.getFullYear(),
        lunarMonth = date.getMonth() + 1,
        lunarDay = date.getDate(),
        solar = new Solar(date, isLeapMonth),
        sYear = solar.year,
        sMonth = solar.month,
        sDay = solar.day,
        weekDay = nStr1[new Date(sYear, sMonth, sDay).getDay()],
        isLeap = solar.isLeap,
        cYear, cMonth, cDay, that = {};

      return addFstv(sYear, sMonth, sDay, weekDay, lunarYear, lunarMonth, lunarDay, isLeap);
    }

  }
  function addFstv(sYear, sMonth, sDay, weekDay, lunarYear, lunarMonth, lunarDay, isLeap) {
    var cYear, cMonth, cDay, that = {};
    ////////年柱 1900年立春后为庚子年(60进制36)
    if(sMonth < 2 ) {
      cYear=cyclical(sYear-1900+36-1);
    } else {
      cYear=cyclical(sYear-1900+36);
    }
    var term2=sTerm(sYear,2); //立春日期

    ////////月柱 1900年1月小寒以前为 丙子月(60进制12)
    var firstNode = sTerm(sYear, sMonth*2) //返回当月「节」为几日开始
    cMonth = cyclical((sYear - 1900) * 12 + sMonth + 12);

    //依节气调整二月分的年柱, 以立春为界
    if(sMonth == 1 && sDay >= term2) cYear = cyclical(sYear - 1900+36);
    //依节气月柱, 以「节」为界
    if(sDay >= firstNode) cMonth = cyclical((sYear - 1900) * 12 + sMonth + 13);
    //当月一日与 1900/1/1 相差天数
    //1900/1/1与 1970/1/1 相差25567日, 1900/1/1 日柱为甲戌日(60进制10)
    var dayCyclical = Date.UTC(sYear, sMonth, 1, 0, 0, 0, 0)/86400000 + 25567 + 10;
    //日柱
    cDay = cyclical(dayCyclical + sDay - 1);

    //sYear,sMonth,sDay,weekDay,
    //lYear,lMonth,lDay,isLeap,
    //cYear,cMonth,cDay
    that = new calElement(sYear, sMonth + 1, sDay, weekDay, lunarYear, lunarMonth, lunarDay, isLeap, cYear, cMonth, cDay);

    // 节气
    tmp1=sTerm(sYear, sMonth * 2) - 1;
    tmp2=sTerm(sYear, sMonth * 2 + 1) - 1;
    if (tmp1 == (sDay - 1)) {
      that.solarTerms = solarTerm[sMonth * 2];
    }
    if (tmp2 == (sDay - 1)) {
      that.solarTerms = solarTerm[sMonth * 2 + 1];
    }

    //公历节日
    for (var i = 0, item; item = sFtv[i]; i++) {
      if(item.match(/^(\d{2})(\d{2})([\s\*])(.+)$/)) {
        if(Number(RegExp.$1)==(sMonth+1)) {
            if (Number(RegExp.$2) == sDay) {
                that.solarFestival += RegExp.$4 + ' ';
            }
        }
      }
    }

    //月周节日
    for (i = 0, item; item = wFtv[i]; i++) {
      if (item.match(/^(\d{2})(\d)(\d)([\s\*])(.+)$/)) {
        if (Number(RegExp.$1) == (sMonth + 1)) {
          tmp1 = Number(RegExp.$2);
          tmp2 = Number(RegExp.$3);
          if (tmp1 < 5) {
            var wFtvDate = (tmp2 == 0 ? 7 : 0) + (tmp1 - 1)*7 + tmp2;
            if (wFtvDate == sDay) {
              that.solarFestival += RegExp.$5 + ' ';
              break;
            }
          }
        }
      }
    }

    // 农历节日
    for (i = 0, item; item = lFtv[i]; i++) {
      if (item.match(/^(\d{2})(.{2})([\s\*])(.+)$/)) {
        tmp1 = Number(RegExp.$1);
        tmp2 = Number(RegExp.$2);
        lMonLen = monthDays(lunarYear, lunarMonth);
        // 月份是12月，且为最后一天，则设置为春节
        if ((tmp1 == lunarMonth && tmp2 == lunarDay) || (tmp2 == '00' && lunarMonth == 12 && lMonLen == lunarDay)) {
          that.lunarFestival += RegExp.$4 + ' ';
          break;
        }
      }
    }

    return that;
  }

  /*
   * example:
   * var cc  =new CalendarConverter;
   *
   * cc.lunar2solar(new Date(2011, 0, 3)); ---> 2010,11,29
   * cc.solar2lunar(new Date(2010, 10, 29)); ----> 2011, 1, 3
   *
   * 农历转公历时，如果那一月是那一年的闰月，则需额外传一个参数，才能得到正确的公历日期
   * cc.solar2lunar(new Date(2012, 4, 27)); ---> 2012年4月初7, 其中 isLeap为true，表示为闰四月
   * cc.lunar2solar(new Date(2012, 3, 7)) ---> 得到错误时间：2012, 4, 27
   * cc.lunar2solar(new Date(2012, 3, 7), true) --> 正确: 2012, 5, 27
   *
   *result:
   *  {
   *    cDay: "戊戌"
        , cMonth: "丁未"
        , cYear: "壬辰"
        , isLeap: false             // 该月是否为闰月
        , lDay: 18
        , lMonth: 6
        , lYear: 2012
        , lunarDay: "十八"
        , lunarFestival: ""
        , lunarMonth: "六"
        , lunarYear: "龙"
        , sDay: 5
        , sMonth: 8
        , sYear: 2012
        , solarFestival: ""         // 节日
        , solarTerms: ""            // 节气
        , week: "日"                // 周几
      }
   *
   */
  window.CalendarConverter = CalendarConverter;
  if ('undefined' !== typeof module && module.exports) {
    module.exports = CalendarConverter;
  } else {
    root.CalendarConverter = CalendarConverter;
  }
})()