var idx=0;
var imgLeft='images/before.jpg';
var imgRight='images/next.jpg';
var imgClose='images/close.gif';

ThailandCalendar={
    _month : new Array('January','February','March','April','May','June','July','August','September','October','November','December'),
    _weak :new Array('Mon','Tue','Wed','Thu','Fri','Sat','Sun'),
    _day : 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),
    _currentyear : new Date().getFullYear(),
    _currentmonth : new Date().getMonth(),
    _currentdate : new Date().getDate(),
    _selectmonth : new Date().getMonth(),
    _selectyear : new Date().getFullYear(),
    _startmonth : new Date().getMonth(),
    _sdate : new Date().getDate(),
    _smonth : new Date().getMonth(),
    _syear : new Date().getFullYear(),
    _startyear : new Date().getFullYear(),
    _object : '',
    _nextE : 0,
    chkinBox:'',
    chkoutBox:'',
    _input : '',
    _x : 0,
    _y : 0,
    _cal:'',
    _calWidth:426,
    _tdh1:null,
    _tdh2:null,
    $:function() {
        var elements = new Array();

        for (var i = 0; i < arguments.length; i++) {
        var element = arguments[i];
        if (typeof element == 'string')
        element = document.getElementById(element);

        if (arguments.length == 1)
            return element;

        elements.push(element);
        }

        return elements;
    },
    setSelectdate:function(){
        var i_date = this._input.value;
        i_date = i_date.split('/');
        i_date=new Date(i_date[1]+'/'+i_date[0]+'/'+i_date[2]);
        this._smonth = i_date.getMonth();
        this._syear = i_date.getFullYear();
        this._sdate = i_date.getDate();
        
        if(this._currentyear==this._syear){
            if(this._currentmonth==this._smonth){
                this._nextE = 0;
            }
            else{
                this._nextE = this._smonth - this._currentmonth;
            }
        }
        this._selectmonth = this._smonth;
        this._selectyear = this._syear;
    },
    initialize:function(){
        //ThailandCalendar._object=document.forms[0];
        ThailandCalendar._object=ThailandCalendar.$('calendarcontrol');
        ThailandCalendar._cal = document.createElement('div');
        ThailandCalendar.setID(ThailandCalendar._cal,'myCalendar');
        ThailandCalendar.setClass(ThailandCalendar._cal,'ThailandCalendar');
        ThailandCalendar._object.appendChild(ThailandCalendar._cal);
        ThailandCalendar.setWidth(ThailandCalendar._cal,ThailandCalendar._calWidth);
        ThailandCalendar.hideCalendar();
    },
    createEvent:function(){
        var anchrs = document.getElementsByTagName('a');
        for(var i=0; i<anchrs.length; i++){
            if(anchrs[i].rel=='startdate'){
                anchrs[i].onclick = 
                    function (event) {
                        ThailandCalendar._input = ThailandCalendar.$(ThailandCalendar.chkinBox);
                        ThailandCalendar.showCalendar(this, event);
                    };
            }
            if(anchrs[i].rel=='enddate'){
                anchrs[i].onclick = 
                    function (event) {
                        ThailandCalendar._input = ThailandCalendar.$(ThailandCalendar.chkoutBox);
                        ThailandCalendar.showCalendar(this, event);
                    };
            }
        }
    },
    createCalendar:function(){
        this.checkSelect();
        this.createmonth(0,this._cal);
        this._selectmonth = this._selectmonth + 1;
        this.checkSelect();
        this.createmonth(this._calWidth/2,this._cal);
        this.setLeft(this._cal,this._x);
        this.setTop(this._cal,this._y);
        this.setPosition(this._cal,'absolute');
    },
    checkSelect:function(){
       if(this._selectmonth>11){
            this._selectmonth = 0;
            this._selectyear = this._selectyear + 1; 
        }
        else if(this._selectmonth<0){ 
            this._selectmonth = 11;
            this._selectyear = this._selectyear - 1; 
        } 
    },
    createbutton:function(){
        var mainTable = document.createElement('table');
        mainTable.cellPadding='5';
        mainTable.border='0';
        mainTable.width='100%';
        
        var _main_tr = mainTable.insertRow(mainTable.rows.length);
        var _main_tc = _main_tr.insertCell(_main_tr.cells.length);
        //_main_tc.colSpan='2';
         this.setAlign(_main_tc,'right');
         this.setClass(_main_tc,'CalendarHeader');
        //this.setClass(div,'CalendarHeader');
        
        var img = document.createElement('img');
        img.alt='Close calendar';
        img.title='Close calendar';
        img.src=imgClose;
        img.style.cursor='pointer';
        img.height='16';
        img.width='16';
        img.onclick=ThailandCalendar.hideCalendar;
        _main_tc.appendChild(img);
        
        _main_tr = mainTable.insertRow(mainTable.rows.length);
        
        _main_tc = _main_tr.insertCell(_main_tr.cells.length);
        _main_tc.width='100%';
        
        this._tdh1 = _main_tc;
        
        //_main_tc = _main_tr.insertCell(_main_tr.cells.length);
        //_main_tc.width='50%';
        
        //this._tdh2 = _main_tc;
        
        this._cal.appendChild(mainTable);
        
         var lb = document.createElement('div');
        if(this._nextE>0)
            lb.innerHTML = "<img id='imgLeft' alt='Previous Month' title='Previous Month' src='"+ imgLeft +"' style='cursor:pointer' onclick='ThailandCalendar.Prevcalendar();'/>";
        var rb = document.createElement('div');
        if(this._nextE<12)
            rb.innerHTML = "<img id='imgLeft' alt='Next Month' title='Next Month' src='"+ imgRight +"' style='cursor:pointer' onclick='ThailandCalendar.NextCalendar();'/>";
        
        this.setClass(lb,'monthPre');
        this.setClass(rb,'monthNext');
        
        this._cal.appendChild(lb);
        this._cal.appendChild(rb);
    },
    createmonth:function(_l,_o){
            var _dt = new Date(this._selectyear,this._selectmonth,1); 
            
            var _layer = document.createElement('div');
            this.setPosition(_layer,'absolute');
            this.setLeft(_layer, _l + 5);
            
            //_o.appendChild(_layer);
            var obj=null;
            if(_l==0){
                if(this._tdh1==null)return;
                else obj=this._tdh1;
            }else{
                if(this._tdh1==null)return;
                else obj= this._tdh1;
            }
            if(obj==null)return;
            
            obj.appendChild(_layer);
            
            /* Create Month-Year Table */
            _header = document.createElement('table');
            this.setClass(_header,'monthHolder');
            _layer.appendChild(_header);
            this.setCellPadding(_header,0);
            this.setCellSpacing(_header,0);
            
            /* Create TR1 for month-year */
            _header_tr = _header.insertRow(_header.rows.length);
            this.setBackgroundColor(_header_tr,'#BF4904');
            
            /* Create Header 1 */
            _header_th = document.createElement('th');
            _header_tr.appendChild(_header_th);
            this.setClass(_header_th,'monthHeader');
            _header_th.colSpan='7';
            _header_th.innerHTML = this._month[_dt.getMonth()] + ' ' + _dt.getFullYear();
            this.setAlign(_header_th,'center');
            
            /* Create TR1 for month-year */
            _header_tr = _header.insertRow(_header.rows.length);
            this.setBackgroundColor(_header_tr,'#BF4904');
            
           
            /* create Table calendar days */
            var _cal = document.createElement('table');
            _layer.appendChild(_cal);
            this.setCellPadding(_cal,0);
            this.setCellSpacing(_cal,2);
            this.setClass(_cal,'monthHolder');
           
            var _c=0;
            var _start=0;
            var totalday = this.DaysArray(_dt.getMonth());
            for(var w=0;w<7;w++){
                _cal_tr = _cal.insertRow(_cal.rows.length);
                for(var d=0;d<7;d++){
                    
                    if(w==0){
                         _header_th = document.createElement('th');
                         this.setAlign(_header_th,'center');
                        _header_th.innerHTML = this._weak[d];
                        _header_tr.appendChild(_header_th);
                    }
                    else{
                        _cal_tc = _cal_tr.insertCell(_cal_tr.cells.length);
                        if((w==1)&&(d+1 ==_dt.getDay()))
                            _start=1;
                        else if((w==1)&&(_dt.getDay()==0)&&d==6)
                            _start=1;
                        if(totalday==_c)
                            _start = 0;
                        if(_start==1){
                            if(_c==this._currentdate-1&&this._selectmonth==this._currentmonth&&this._selectyear==this._currentyear){
                                this.setClass(_cal_tc,'todayDate');
                                if(idx==0)
                                    _cal_tc.setAttribute("onclick","ThailandCalendar.setDate(this,0,"+this._day[_c]+");");
                                else
                                    _cal_tc.setAttribute("onclick","ThailandCalendar.setDate(this,1,"+this._day[_c]+");");
                            }
                            else if(_c==this._sdate-1&&this._smonth==this._selectmonth&&this._syear==this._selectyear){
                                this.setClass(_cal_tc,'selecteddate');
                                if(idx==0)
                                    _cal_tc.setAttribute("onclick","ThailandCalendar.setDate(this,0,"+this._day[_c]+");");
                                else
                                    _cal_tc.setAttribute("onclick","ThailandCalendar.setDate(this,1,"+this._day[_c]+");");   
                            }
                            else if(_c<this._currentdate-1&&this._selectmonth==this._currentmonth&&this._selectyear==this._currentyear)
                                this.setClass(_cal_tc,'pastdate');
                            else {
                                this.setMouseEvent(_cal_tc);
                                this.setCursor(_cal_tc);
                                if(idx==0)
                                    _cal_tc.setAttribute("onclick","ThailandCalendar.setDate(this,0,"+this._day[_c]+");");
                                else
                                    _cal_tc.setAttribute("onclick","ThailandCalendar.setDate(this,1,"+this._day[_c]+");");
                            }
                            
                            this.setAlign(_cal_tc,'center');
                            _cal_tc.innerHTML = this._day[_c];
                            _c++;
                        }
                        else{
                            this.setClass(_cal_tc,'nodate');
                        }
                    }
                }
            }
            _cal_tr = _cal.insertRow(_cal.rows.length);
            _cal_tc = _cal_tr.insertCell(_cal_tr.cells.length);
            var hidden = document.createElement('input');
            hidden.type = 'hidden';
            this.setID(hidden,'date'+ idx);
            hidden.value = this._selectmonth + 1 + '/' + this._selectyear;
            _cal_tc.appendChild(hidden);
            this.setClass(_cal_tc,'nodate');
            if(idx==0)idx=1;else idx=0;
    },
    daysInFebruary:function(year){
        return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
    },
    DaysArray:function(i){
        var returnParam = 31
		if (i==3 || i==5 || i==8 || i==10) {returnParam = 30}
		if (i==1) {returnParam = this.daysInFebruary(this._currentyear);}
        return returnParam;
    },
    Prevcalendar:function(){
        if(this._selectmonth==0){
            this._selectmonth = 10;
            this._selectyear -= 1;
        }
        else
            this._selectmonth -= 2;
            
        this.checkSelect();    
        this._nextE--;    
        this._cal.innerHTML = '';
        this.createbutton();
        this.createmonth(-this._calWidth/2,this._cal);
        
        this._selectmonth +=1;
        this.checkSelect();
        this.createCalendar();
        
        this._selectmonth -=1;
        this.checkSelect();
        this.fidding(0);
        
    },
    NextCalendar:function(){ 
        this._nextE++;
        this._cal.innerHTML = '';
        this.createbutton();
        
        this._selectmonth -=1;
        this.checkSelect();
        this.createCalendar();
       
        this._selectmonth +=1;
        this.checkSelect();
        this.createmonth(this._calWidth,this._cal);
       
        this.fidding(1);
    },
    fidding:function(i){
        
        var _l1 = this.getLeft(this._tdh1.childNodes[0]);
        var _l2 = this.getLeft(this._tdh1.childNodes[1]);
        var _l3 = this.getLeft(this._tdh1.childNodes[2]);
        
        if(i==1){
            _l1 -=20;
            _l2 -=20;
            _l3 -=20;
        }
        else{
           _l1 +=20;
           _l2 +=20;
           _l3 +=20; 
        }
        this.setLeft(this._tdh1.childNodes[0],_l1);
        this.setLeft(this._tdh1.childNodes[1],_l2);
        this.setLeft(this._tdh1.childNodes[2],_l3);
        if(_l2<6&&i==1){
            this.setLeft(this._tdh1.childNodes[1],5);
            this.setLeft(this._tdh1.childNodes[2],this._calWidth/2 + 5);
            this._tdh1.removeChild(this._tdh1.childNodes[0]);
            return;
        }
        else if((_l1>-6)&&(i==0)){
            this.setLeft(this._tdh1.childNodes[0],5);
            this.setLeft(this._tdh1.childNodes[1],this._calWidth/2 + 5);
            this._tdh1.removeChild(this._tdh1.childNodes[2]);
            return;
        }
        setTimeout("ThailandCalendar.fidding("+i+");",2);
    },
    getDate:function(idate){
        var i_date = idate.split('/');    
        return new Date(i_date[1]+'/'+i_date[0]+'/'+i_date[2]);
    },
    setDate:function(_o,i,v){
        var idate = v + '/' + ThailandCalendar.$('date' + i).value;
        var i_date = ThailandCalendar.getDate(idate);
        if(ThailandCalendar._input.id.indexOf('checkIn')!=-1){
            i_date.setDate(i_date.getDate() + 5);
            var month = parseInt(i_date.getMonth()) + 1;
            ThailandCalendar.$(ThailandCalendar.chkoutBox).value = i_date.getDate() + '/' + month + '/' + i_date.getFullYear();
        }
        else{
            var odate = ThailandCalendar.getDate(ThailandCalendar.$(ThailandCalendar.chkinBox).value);
            if(i_date.getFullYear()<odate.getFullYear()||i_date.getMonth()<odate.getMonth()||(i_date.getFullYear()==odate.getFullYear()&&i_date.getMonth()==odate.getMonth()&&i_date.getDate()<=odate.getDate())){
                alert('Check out date should not be prior to check in date');
                return false;
            }else{
                var diff=new Date();
                diff.setTime(Math.abs(i_date.getTime() - odate.getTime()));
                
                var timediff = diff.getTime();
                
                var weeks = Math.floor(timediff / (1000 * 60 * 60 * 24 * 7));
                
                timediff -= weeks * (1000 * 60 * 60 * 24 * 7);

                var days = Math.floor(timediff / (1000 * 60 * 60 * 24)); 
                
                var days = (parseInt(weeks)*7) + parseInt(days);
                
                if(days>90)
                {
                    alert('You can not select more than 3 months period');
                    return false;
                }
            }
        }
        ThailandCalendar._input.value = idate;
        ThailandCalendar.hideCalendar();
    },
    hideCalendar:function(){
        ThailandCalendar.setDisplay(ThailandCalendar._cal,'none');
    },
    showCalendar:function(_obj,evt){
        this._cal.innerHTML = ''; 
        this._nextE=0;
        this.setSelectdate();
        this.setDisplay(this._cal,'block');
        this.createbutton();
        this.createCalendar();
        var e = evt||window.event;
        this._x = e.pageX||e.clientX;
        this._y = e.pageY||e.clientY;
        this.setLeft(this._cal,this._x);
        this.setTop(this._cal,this._y);
        this.setPosition(this._cal,'absolute');
    },
    
    addLoadEvent: function (func) {
        var oldonload = window.onload;
        if (typeof window.onload != 'function') {
            window.onload = func;
        }
        else {
            window.onload = function () {
                oldonload();
                func();
            }
        }
    },
    setClass:function(element,classname){
	    element.className=classname;
	},
	setAlign:function(element,alignment){
	    element.align = alignment;
	},
	setVAlign:function(element,alignment){
	    element.vAlign = alignment;
	},
	setMouseEvent:function(element){
	    element.onmouseover = function(){element.style.backgroundColor='#DCE4F9';}
	    element.onmouseout = function(){element.style.backgroundColor='';}
//	    Event.observe(element,'mouseover',function(){element.style.backgroundColor='';});
//	    Event.observe(element,'mouseout',function(){element.style.backgroundColor='';});
	},
	setCursor:function(element){
	    element.style.cursor='pointer';
	},
	setCellPadding:function(element,_v){
	    element.cellPadding = _v;
	},
	setCellSpacing:function(element,_v){
	    element.cellSpacing = _v;
	},
	setID:function(element,id){
	    element.setAttribute('id',id);
	},
	setTop:function(element,top){
	    element.style.top = top + 'px';
	},
	setLeft:function(element,left){
	    element.style.left = left + 'px';
	},
	setDisplay:function(element,display){
	    element.style.display = display;
	},
	setPosition:function(element,position){
	    element.style.position = position;
	},
	getLeft:function(element){
	    return parseInt(element.style.left.replace('px',''));
	},
	getOfsetWidth:function(element){
	    return element.offsetWidth;
	},
	setWidth:function(element,width){
	    element.style.width = width + 'px';
	},
	setHeight:function(element,height){
	    element.style.height = height + 'px';
	},
	setBackgroundColor:function(element,bg){
	    element.style.backgroundColor=bg;
	}
}
ThailandCalendar.addLoadEvent(ThailandCalendar.initialize);
ThailandCalendar.addLoadEvent(ThailandCalendar.createEvent);