var Calendar = Class.create();

Calendar.prototype = {
  initialize: function(){
    this.calX = 0;
    this.calY = 0;
    this.dropYearMonth = null;
    this.dropDay = null;
    this.dropYearMonthNext = null;
    this.dropDayNext = null;
    this.currentMonth = 0;
  },

  dayHeaders:  new Array('M','T','W','T','F','S','S'),
  months:      new Array('Jan-2009','Feb-2009','Mar-2009','Apr-2009','May-2009','Jun-2009','Jul-2009','Aug-2009','Sep-2009','Oct-2009','Nov-2009','Dec-2009','Jan-2010','Feb-2010','Mar-2010','Apr-2010','May-2010','Jun-2010','Jul-2010','Aug-2010','Sep-2010','Oct-2010','Nov-2010','Dec-2010','Jan-2011','Feb-2011','Mar-2011','Apr-2011','May-2011','Jun-2011','Jul-2011','Aug-2011','Sep-2011','Oct-2011','Nov-2011','Dec-2011'),
  monthDates:  new Array('200901','200902','200903','200904','200905','200906','200907','200908','200909','200910','200911','200912','201001','201002','201003','201004','201005','201006','201007','201008','201009','201010','201011','201012','201101','201102','201103','201104','201105','201106','201107','201108','201109','201110','201111','201112'),
  monthMatrix: new Array(
    new Array(0,0,0,101,102,103,104,105,206,107,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0),
    new Array(0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0),
    new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0),
    new Array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0),
    new Array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0),
    new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,0,0,0,0,0,0,0,0,0,0,0,0,0,0),
    new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0),
    new Array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0),
    new Array(0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0),
    new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0),
    new Array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,0,0,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0),
    new Array(0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0),
    new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0),
    new Array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,0,0,0,0,0,0,0,0,0,0,0),
    new Array(0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,0,0,0,0,0,0,0,0) 
  ),

  handleSyncDates: function(){
    this.fixDays(this.dropYearMonth,this.dropDay);
    if( this.dropYearMonthNext && this.dropDayNext && this.nights )
    {
      if( this.nights>0 )
        this.handleSyncDatesF();
      else
        this.handleSyncDatesB();
    }
  },

  fixDays: function(dropYearMonth, dropDay){
     var day = dropDay.value;
     var mday_index = 0;
     this.monthDates.each(function(value,index){ if( value==dropYearMonth.value ) mday_index=index; });
     var mday = this.monthMatrix[mday_index];
     var min = 31;
     mday.each(function(value,index){ if( value>0 && value<min ) min=value; });
     var max = 1;
     mday.each(function(value,index){ if( value>0 && value<32 ) max=value; });
     if( day<min ) dropDay.value = min;
     if( day>max ) dropDay.value = max;
  },

  handleSyncDatesF: function(){
    var day = parseInt(this.dropDay.value);
    var nights = this.nights;
    for(var i=0; i<this.monthDates.length; i++)
      if( this.monthDates[i] == this.dropYearMonth.value )
      {
        var mday = this.monthMatrix[i];
        for(var j=0; j<mday.length; j++)
        {
          if(mday[j] == day)
          {
            while(nights>0)
            {
              j++;
              if( j==mday.length || mday[j]==0 )
              {
                i++;
                if( i==this.monthDates.length )
                {
                  i--;
                  j--;
                  break;
                }
                else
                {
                  mday = this.monthMatrix[i];
                  j = 0;
                  while(j<mday.length && mday[j]==0) j++;
                }
              }
              nights --;
            }
            this.dropYearMonthNext.value = this.monthDates[i];
            this.dropDayNext.value = mday[j];
            return;
          }
        }
      }
  },
  handleSyncDatesB: function(){
    var day = parseInt(this.dropDay.value);
    var nights = this.nights;
    for(var i = this.monthDates.length-1; i>=0; i--)
      if( this.monthDates[i] == this.dropYearMonth.value )
      {
        var mday = this.monthMatrix[i];
        for(var j=mday.length-1; j>=0; j--)
        {
          if(mday[j] == day)
          {
            while(nights<0)
            {
              j--;
              if( j<0 || mday[j]==0 || mday[j]>31 )
              {
                i--;
                if( i==-1 )
                {
                  i++;
                  j++;
                  break;
                }
                else
                {
                  mday = this.monthMatrix[i];
                  j = mday.length-1;
                  while(j>=0 && mday[j]==0) j--;
                }
              }
              nights ++;
            }
            this.dropYearMonthNext.value = this.monthDates[i];
            this.dropDayNext.value = mday[j];
            return;
          }
        }
      }
  },

  syncDates: function(dropYearMonthObj, dropDayObj, dropYearMonthNextObj, dropDayNextObj, days){
    this.dropYearMonth = dropYearMonthObj;
    this.dropDay = dropDayObj;
    this.dropYearMonthNext = dropYearMonthNextObj;
    this.dropDayNext = dropDayNextObj;
    this.nights = days;
    this.handleSyncDates();
  },

  set_drop: function(o,val){
    for (i=0;i<o.length;i++)
      if (o[i].value==val)
        o.selectedIndex = i;
  },

  move_month: function(dir){
    if (dir==1) { ++this.currentMonth; this.draw_calendar(); }
    else { --this.currentMonth; this.draw_calendar(); }
  },

  handle_click: function(isoIn){
    isoIn = "" + isoIn;
    this.dropDay.value = parseInt(isoIn.substring(6,8),10);
    this.set_drop(this.dropYearMonth, isoIn.substring(0,6) );
    this.handleSyncDates();
    this.hide_calendar();
  },

  open_cal1: function(dropYearMonthObj, dropDayObj){
    this.dropYearMonth = dropYearMonthObj;
    this.dropDay = dropDayObj;
    this.dropYearMonthNext = null;
    this.dropDayNext = null;
    this.nights = 0;
    for (i=0;i<this.monthDates.length;i++)
      if (this.dropYearMonth[this.dropYearMonth.selectedIndex].value==this.monthDates[i])
        this.currentMonth = i;
    this.draw_calendar();
  },
  open_cal2: function(dropYearMonthObj, dropDayObj, dropYearMonthNextObj, dropDayNextObj, days){
    this.dropYearMonth = dropYearMonthObj;
    this.dropDay = dropDayObj;
    this.dropYearMonthNext = dropYearMonthNextObj;
    this.dropDayNext = dropDayNextObj;
    this.nights = days;
    for (i=0;i<this.monthDates.length;i++)
      if (this.dropYearMonth[this.dropYearMonth.selectedIndex].value==this.monthDates[i])
        this.currentMonth = i;
    this.draw_calendar();
  },

  hide_calendar: function(){
    this.dropYear = null;
    this.dropMonth = null;
    this.dropYearMonth = null;
    this.dropDay = null;
    this.dropYearMonthNext = null;
    this.dropDayNext = null;
    Element.hide(this.element);
  },

  draw_calendar: function(){
    var table_top;
    var print_string;
    var tmpHtml = "";
    var month = this.currentMonth;

    table_top = '<table cellpadding="0" cellspacing="0" border="0" class="calMain"><tr>\n';

    if(month>0)
      tmpHtml = '<a href="javascript:myCalendar.move_month(-1);" class="calNextPrev">&lt;&lt;</a>';
    else
      tmpHtml = '&nbsp;';

    table_top += '<td class="calNextPrev">' + tmpHtml + '</td>\n';

    table_top += '<td colspan="5" class="calTextTitle">' + this.months[month] + '</td>\n';

    if(month<(this.monthMatrix.length-1))
      tmpHtml = '<a href="javascript:myCalendar.move_month(1);" class="calNextPrev">&gt;&gt;</a>';
    else
      tmpHtml = '&nbsp;';

    table_top += '<td class="calNextPrev">' + tmpHtml + '</td>\n';

    table_top += '</tr>\n';
    table_top += '<tr><td colspan="7" class="calSeparator"></td></tr>\n';
    table_top += '<tr>\n';
    for (dh=0;dh<this.dayHeaders.length;dh++)
      table_top += '<td class="calDaysChar">'+this.dayHeaders[dh]+'</td>';
    table_top += '</tr>\n';
    table_top += '<tr><td colspan="7" class="calSeparator"></td></tr>\n';

    print_string = '<tr>';

    thisMonth = this.monthMatrix[month];
    for (rw=0;rw<42;rw++)
    {
      if (rw!=0 && rw!=(thisMonth.length-1) && (rw%7==0))
        print_string += "</tr>\n<tr>";

      if (thisMonth[rw]!=0)
      {
        var box = "";
        if( this.monthDates[month]==this.dropYearMonth.value && (this.dropDay.value==thisMonth[rw] || this.dropDay.value==(thisMonth[rw]-200)) ) box = " style='border:1px solid #f06f38'";
        var clickDate = (this.monthDates[month]*100 + thisMonth[rw]);
        if (thisMonth[rw]>200)
          print_string += '<td class="calDayCur"'+box+'>' + thisMonth[rw]%200 + '</td>';
          //print_string += '<td class="calDayCur"'+box+'><a class="calDayCur" href="javascript:myCalendar.handle_click(' + (clickDate-200) + ');">' + thisMonth[rw]%200 + '</a></td>';
        else if (thisMonth[rw]>100)
          print_string += '<td class="calDay">' + thisMonth[rw]%100 + '</td>';
        else
          print_string += '<td class="calDay"'+box+'><a class="calDay" href="javascript:myCalendar.handle_click('
                       + clickDate + ');">' + thisMonth[rw] + '</a></td>';
      }
      else
        print_string += '<td class="calDay">&nbsp;</td>';
    }
    print_string += '</tr>\n';
    print_string += '<tr><td colspan="7" class="calBottom"><a class="calClose" href="javascript:myCalendar.hide_calendar();">close</a></td></tr>\n';
    print_string += '</table>\n';

    this.element.innerHTML = table_top + print_string;
    Element.setStyle(this.element, {left:this.calX+'px', top:this.calY+'px'});
    Element.show(this.element);
  }
}

var myCalendar = new Calendar();

function openCal1(obj)
{
  myCalendar.element = $('calendar');
  pos = Position.cumulativeOffset(obj);
  myCalendar.calX=pos[0]+0;
  myCalendar.calY=pos[1]-0;
  var days = $("nights").value;
  myCalendar.open_cal2($('date1m'), $('date1d'), $('date2m'), $('date2d'), $("nights").value);
}
function openCal2(obj)
{
  myCalendar.element = $('calendar');
  pos = Position.cumulativeOffset(obj);
  myCalendar.calX=pos[0]+0;
  myCalendar.calY=pos[1]-0;
  var days = $("nights").value;
  myCalendar.open_cal2($('date2m'), $('date2d'), $('date1m'), $('date1d'), -$("nights").value);
}
function calcCal1()
{
  myCalendar.element = $('calendar');
  myCalendar.syncDates($('date1m'), $('date1d'), $('date2m'), $('date2d'), $("nights").value);
}
function calcCal2()
{
  myCalendar.element = $('calendar');
  myCalendar.syncDates($('date2m'), $('date2d'), $('date1m'), $('date1d'), -$("nights").value);
}
function tr_openCal1(obj)
{
  myCalendar.element = $('calendar');
  pos = Position.cumulativeOffset(obj);
  myCalendar.calX=pos[0]+0;
  myCalendar.calY=pos[1]-0;
  myCalendar.open_cal1($('tr_date1m'), $('tr_date1d'));
}
function tr_openCal2(obj)
{
  myCalendar.element = $('calendar');
  pos = Position.cumulativeOffset(obj);
  myCalendar.calX=pos[0]+0;
  myCalendar.calY=pos[1]-0;
  myCalendar.open_cal1($('tr_date2m'), $('tr_date2d'));
}