// Title: Tigra Calendar
// URL: http://www.softcomplex.com/products/tigra_calendar/
// Version: 3.4 (European date format)
// Date: 07/12/2007
// Note: Permission given to use this script in ANY kind of applications if
//    header lines are left unchanged.
// Note: Script consists of two files: calendar?.js and calendar.asp

// if two digit year input dates after this year considered 20 century.
var NUM_CENTYEAR = 30;
// is time input control required by default
var BUL_TIMECOMPONENT = false;
// are year scrolling buttons required by default
var BUL_YEARSCROLL = true;

var calendars = [];
var RE_NUM = /^\-?\d+$/;

function calendar1(obj_target) {

	// assigning methods
	this.gen_date = cal_gen_date1;
	this.gen_time = cal_gen_time1;
	this.gen_tsmp = cal_gen_tsmp1;
	this.prs_date = cal_prs_date1;
	this.prs_time = cal_prs_time1;
	this.prs_tsmp = cal_prs_tsmp1;
	this.popup    = cal_popup1;

	// validate input parameters
	if (!obj_target)
		return cal_error("Error calling the calendar: no target control specified");
	if (obj_target.value == null)
		return cal_error("Error calling the calendar: parameter specified is not valid target control");
	this.target = obj_target;
	this.time_comp = BUL_TIMECOMPONENT;
	this.year_scroll = BUL_YEARSCROLL;
	
	// register in global collections
	this.id = calendars.length;
	calendars[this.id] = this;
}

function cal_popup1 (str_datetime) {
	if (str_datetime)
		this.dt_current = this.prs_tsmp(str_datetime);
	else 
		this.dt_selected = this.dt_current = this.prs_tsmp(this.target.value);

	if (!this.dt_current) return;

	var obj_calwindow = window.open(
		'calendar.asp?id=' + this.id + '&s=' + this.dt_selected.valueOf() + '&c=' + this.dt_current.valueOf(),
		'Calendar', 'width=200,height=' + (this.time_comp ? 190 : 185) +
		',status=no,resizable=no,top=200,left=200,dependent=yes,alwaysRaised=yes'
	);
	obj_calwindow.opener = window;
	obj_calwindow.focus();
}

// timestamp generating function
function cal_gen_tsmp1 (dt_datetime) {
	return(this.gen_date(dt_datetime) + ' ' + this.gen_time(dt_datetime));
}

// date generating function
function cal_gen_date1 (dt_datetime) {

    var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']

	return (
		(dt_datetime.getDate() < 10 ? '0' : '') + dt_datetime.getDate() + " "
		+ months[dt_datetime.getMonth()] + " "
		+ dt_datetime.getFullYear()
	);
}
// time generating function
function cal_gen_time1 (dt_datetime) {
	return (
		(dt_datetime.getHours() < 10 ? '0' : '') + dt_datetime.getHours() + ":"
		+ (dt_datetime.getMinutes() < 10 ? '0' : '') + (dt_datetime.getMinutes()) + ":"
		+ (dt_datetime.getSeconds() < 10 ? '0' : '') + (dt_datetime.getSeconds())
	);
}

// timestamp parsing function
function cal_prs_tsmp1 (str_datetime) {
	// if no parameter specified return current timestamp
	if (!str_datetime)
		return (new Date());

	// if positive integer treat as milliseconds from epoch
	if (RE_NUM.exec(str_datetime))
		return new Date(str_datetime);
		
	// else treat as date in string format
	var arr_datetime = str_datetime.split(':');
	return this.prs_time(arr_datetime[1], this.prs_date(arr_datetime[0]));
}

// date parsing function
function cal_prs_date1 (str_date) {

	var arr_date = str_date.split(' ');
    
    if (isNaN(arr_date[1]))
    {
        var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
	    for(var i=0;i<months.length;i++)
	    {
		    if (months[i] == arr_date[1])
		    {
		        arr_date[1] = i+1;   
		    }
	    }
	}    

	if (arr_date.length != 3) return cal_error ("Invalid date format: '" + str_date + "'.\nFormat accepted is dd mmm yyyy.\n\ne.g. 27 May 2007");
	if (!arr_date[0]) return cal_error ("Invalid date format: '" + str_date + "'.\nNo day of month value can be found.");
	if (!RE_NUM.exec(arr_date[0])) return cal_error ("Invalid day of month value: '" + arr_date[0] + "'.\nAllowed values are unsigned integers.");
	if (!arr_date[1]) return cal_error ("Invalid date format: '" + str_date + "'.\nNo month value can be found.");
	if (!RE_NUM.exec(arr_date[1])) return cal_error ("Invalid month value: '" + arr_date[1] + "'.\nAllowed values are unsigned integers.");
	if (!arr_date[2]) return cal_error ("Invalid date format: '" + str_date + "'.\nNo year value can be found.");
	if (!RE_NUM.exec(arr_date[2])) return cal_error ("Invalid year value: '" + arr_date[2] + "'.\nAllowed values are unsigned integers.");

	var dt_date = new Date();
	dt_date.setDate(1);

	if (arr_date[1] < 1 || arr_date[1] > 12) return cal_error ("Invalid month value: '" + arr_date[1] + "'.\nAllowed range is 01-12.");
	dt_date.setMonth(arr_date[1]-1);
	 
	if (arr_date[2] < 100) arr_date[2] = Number(arr_date[2]) + (arr_date[2] < NUM_CENTYEAR ? 2000 : 1900);
	dt_date.setFullYear(arr_date[2]);

	var dt_numdays = new Date(arr_date[2], arr_date[1], 0);
	dt_date.setDate(arr_date[0]);
	if (dt_date.getMonth() != (arr_date[1]-1)) return cal_error ("Invalid day of month value: '" + arr_date[0] + "'.\nAllowed range is 01-"+dt_numdays.getDate()+".");

	return (dt_date)
}

// time parsing function
function cal_prs_time1 (str_time, dt_date) {

	if (!dt_date) return null;
	var arr_time = String(str_time ? str_time : '').split(':');

	if (!arr_time[0]) dt_date.setHours(0);
	else if (RE_NUM.exec(arr_time[0]))
		if (arr_time[0] < 24) dt_date.setHours(arr_time[0]);
		else return cal_error ("Invalid hours value: '" + arr_time[0] + "'.\nAllowed range is 00-23.");
	else return cal_error ("Invalid hours value: '" + arr_time[0] + "'.\nAllowed values are unsigned integers.");
	
	if (!arr_time[1]) dt_date.setMinutes(0);
	else if (RE_NUM.exec(arr_time[1]))
		if (arr_time[1] < 60) dt_date.setMinutes(arr_time[1]);
		else return cal_error ("Invalid minutes value: '" + arr_time[1] + "'.\nAllowed range is 00-59.");
	else return cal_error ("Invalid minutes value: '" + arr_time[1] + "'.\nAllowed values are unsigned integers.");

	if (!arr_time[2]) dt_date.setSeconds(0);
	else if (RE_NUM.exec(arr_time[2]))
		if (arr_time[2] < 60) dt_date.setSeconds(arr_time[2]);
		else return cal_error ("Invalid seconds value: '" + arr_time[2] + "'.\nAllowed range is 00-59.");
	else return cal_error ("Invalid seconds value: '" + arr_time[2] + "'.\nAllowed values are unsigned integers.");

	dt_date.setMilliseconds(0);
	return dt_date;
}

function cal_error (str_message) {
	alert (str_message);
	return null;
}


function checkdate(objName)
{
    var datefield = objName;
    if (chkdate(objName) == false)
    {
        datefield.select();
        alert("That date is invalid.  Please try again.");
        datefield.focus();
        return false;
    }
    else
    {
        return true;
    }
}

function chkdate(objName)
{
    //var strDatestyle = "US"; //United States date style
    var strDatestyle = "EU";  //European date style
    var strDate;
    var strDateArray;
    var strDay;
    var strMonth;
    var strYear;
    var intday;
    var intMonth;
    var intYear;
    var booFound = false;
    var datefield = objName;
    var strSeparatorArray = new Array("-"," ","/",".");
    var intElementNr;
    var err = 0;
    var strMonthArray = new Array(12);
    strMonthArray[0] = "Jan";
    strMonthArray[1] = "Feb";
    strMonthArray[2] = "Mar";
    strMonthArray[3] = "Apr";
    strMonthArray[4] = "May";
    strMonthArray[5] = "Jun";
    strMonthArray[6] = "Jul";
    strMonthArray[7] = "Aug";
    strMonthArray[8] = "Sep";
    strMonthArray[9] = "Oct";
    strMonthArray[10] = "Nov";
    strMonthArray[11] = "Dec";
    strDate = datefield.value;
    if (strDate.length < 1)
    {
        return true;
    }
    
    for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++)
    {
        if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1)
        {
            strDateArray = strDate.split(strSeparatorArray[intElementNr]);
            if (strDateArray.length != 3)
            {
                err = 1;
                return false;
            }
            else
            {
                strDay = strDateArray[0];
                strMonth = strDateArray[1];
                strYear = strDateArray[2];
            }
            booFound = true;
        }
    }
    
    if (booFound == false)
    {
        if (strDate.length>5)
        {
            strDay = strDate.substr(0, 2);
            strMonth = strDate.substr(2, 2);
            strYear = strDate.substr(4);
        }
    }
    
    if (strYear)
    {    
        if (strYear.length == 2)
        {
            strYear = '20' + strYear;
        }
        
        if (strYear.length > 4)
        {
            alert("That date is invalid.  Please try again.");
        }
    }
    else
    
    {
        return false;
    }
    
    
    // US style
    if (strDatestyle == "US")
    {
        strTemp = strDay;
        strDay = strMonth;
        strMonth = strTemp;
    }
    
    intday = parseInt(strDay, 10);
    if (isNaN(intday))
    {
        err = 2;
        return false;
    }
    
    intMonth = parseInt(strMonth, 10);
    if (isNaN(intMonth))
    {
        for (i = 0;i<12;i++)
        {
            if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase())
            {
                intMonth = i+1;
                strMonth = strMonthArray[i];
                i = 12;
            }
        }
        if (isNaN(intMonth))
        {
            err = 3;
            return false;
        }
    }
    intYear = parseInt(strYear, 10);
    if (isNaN(intYear))
    {
        err = 4;
        return false;
    }

    if (intMonth>12 || intMonth<1)
    {
        err = 5;
        return false;
    }
    
    if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1))
    {
        err = 6;
        return false;
    }
    if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1))
    {
        err = 7;
        return false;
    }
    if (intMonth == 2)
    {
        if (intday < 1)
        {
            err = 8;
            return false;
        }
        if (LeapYear(intYear) == true)
        {
            if (intday > 29)
            {
                err = 9;
                return false;
            }
        }
        else
        {
            if (intday > 28)
            {
                err = 10;
                return false;
            }
        }
    }
    if (strDatestyle == "US")
    {
        datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
    }
    else
    {
        datefield.value = intday + " " + strMonthArray[intMonth-1] + " " + strYear;
    }
    return true;
}

function LeapYear(intYear)
{
    if (intYear % 100 == 0)
    {
        if (intYear % 400 == 0)
        {
            return true;
        }
    }
    else
    {
        if ((intYear % 4) == 0)
        {
            return true;
        }
    }
    return false;
}

function doDateCheck(from, to)
{
    if (Date.parse(from.value) <= Date.parse(to.value))
    {
        return '';
    }
    else
    {
        if (from.value == "" || to.value == "")
        {
            return 'Both dates must be entered.';
        }
        else 
        {
            return 'The \'To Date\' must occur after the \'From Date\'.';
        }   
   }
}