// Original:  Kedar R. Bhave (softricks@hotmail.com) 
// Web Site:  http://www.softricks.com 
// This script and many more are available free online at
// The JavaScript Source!! http://javascript.internet.com 
//
// ---------------------------------------------------------------------------
//
// Change Activities
// @01 - 04/16/04 - RJM
//		Pass in Month and weekday names in "show_calendar" and save their
//		contents.	
// 
// ---------------------------------------------------------------------------

var weekend = [0,6];
var weekendColor = "#e0e0e0";
var fontface = "Verdana";

isNav = (navigator.appName.indexOf("Netscape") != -1) ? true : false;
isIE = (navigator.appName.indexOf("Microsoft") != -1) ? true : false;

Calendar.Months = new Array(12);	// @01
Calendar.Weekdays = new Array(7);	// @01

// Non-Leap year Month days..
Calendar.DOMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
// Leap year Month days..
Calendar.lDOMonth = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function Calendar(p_item, p_cellid, p_date, p_month, p_year, p_format) {

	this.gMonthName = Calendar.get_month(p_month);
	this.gMonth = new Number(p_month);

	this.gYear = p_year;
	this.gFormat = p_format;
	this.gBGColor = "white";
	this.gFGColor = "black";
	this.gTextColor = "black";
	this.gHeaderColor = "black";
	this.gReturnItem = p_item;
	this.gCellID = p_cellid;
	this.gDate = p_date;
}

Calendar.get_month = Calendar_get_month;
Calendar.get_daysofmonth = Calendar_get_daysofmonth;
Calendar.calc_month_year = Calendar_calc_month_year;

function Calendar_get_month(monthNo) {
	return Calendar.Months[monthNo];
}

function Calendar_get_daysofmonth(monthNo, p_year) {
	/* 
	Check for leap year ..
	1.Years evenly divisible by four are normally leap years, except for... 
	2.Years also evenly divisible by 100 are not leap years, except for... 
	3.Years also evenly divisible by 400 are leap years. 
	*/
	if ((p_year % 4) == 0) {
		if ((p_year % 100) == 0 && (p_year % 400) != 0)
			return Calendar.DOMonth[monthNo];
	
		return Calendar.lDOMonth[monthNo];
	} else
		return Calendar.DOMonth[monthNo];
}

function Calendar_calc_month_year(p_Month, p_Year, incr) {
	/* 
	Will return an 1-D array with 1st element being the calculated month 
	and second being the calculated year 
	after applying the month increment/decrement as specified by 'incr' parameter.
	'incr' will normally have 1/-1 to navigate thru the months.
	*/
	var ret_arr = new Array();
	
	if (incr == -1) {
		// B A C K W A R D
		if (p_Month == 0) {
			ret_arr[0] = 11;
			ret_arr[1] = parseInt(p_Year) - 1;
		}
		else {
			ret_arr[0] = parseInt(p_Month) - 1;
			ret_arr[1] = parseInt(p_Year);
		}
	} else if (incr == 1) {
		// F O R W A R D
		if (p_Month == 11) {
			ret_arr[0] = 0;
			ret_arr[1] = parseInt(p_Year) + 1;
		}
		else {
			ret_arr[0] = parseInt(p_Month) + 1;
			ret_arr[1] = parseInt(p_Year);
		}
	}
	
	return ret_arr;
}

// This is for compatibility with Navigator 3, we have to create and discard one object before the prototype object exists.
new Calendar();

Calendar.prototype.getMonthlyCalendarCode = function() {
	var vCode = "";
	var vHeader_Code = "";
	var vData_Code = "";
	
	// Begin Table Drawing code here..
	vCode = vCode + "<TABLE BORDER=1 BGCOLOR=\"" + this.gBGColor + "\">";
	
	vHeader_Code = this.cal_header();
	vData_Code = this.cal_data();
	vCode = vCode + vHeader_Code + vData_Code;
	
	vCode = vCode + "</TABLE>";
	
	return vCode;
}

Calendar.prototype.clickDate = function(p_date)
{


}

Calendar.prototype.refresh = function() {
	var vCode = "";
	
	vCode = vCode + ("<CENTER><FONT FACE='" + fontface + "' SIZE=3><B>");
	vCode = vCode + (this.gMonthName + " " + this.gYear);
	vCode = vCode + ("</B></CENTER>");

	// Show navigation buttons
	var prevMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, -1);
	var prevMM = prevMMYYYY[0];
	var prevYYYY = prevMMYYYY[1];

	var nextMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, 1);
	var nextMM = nextMMYYYY[0];
	var nextYYYY = nextMMYYYY[1];
	
	vCode = vCode + ("<TABLE WIDTH='100%' BORDER=1 CELLSPACING=0 CELLPADDING=0 BGCOLOR='#e0e0e0'><TR><TD ALIGN=center>");
	vCode = vCode + ("[<A HREF=\"" +
		"javascript:Build(" + 
		"'" + this.gReturnItem + "', '" +
		this.gCellID + "', '" + this.gDate.toString() + "', '" +
		this.gMonth + "', '" + (parseInt(this.gYear)-1) + "', '" + this.gFormat + "'" +
		");" +
		"\"><<<\/A>]</TD><TD ALIGN=center>");
	vCode = vCode + ("[<A HREF=\"" +
		"javascript:Build(" + 
		"'" + this.gReturnItem + "', '" +
		this.gCellID + "', '" + this.gDate.toString() + "', '" +
		prevMM + "', '" + prevYYYY + "', '" + this.gFormat + "'" +
		");" +
		"\"><<\/A>]</TD><TD ALIGN=center>");
	vCode = vCode + ("[<A HREF=\"" +
		"javascript:Build(" + 
		"'" + this.gReturnItem + "', '" +
		this.gCellID + "', '" + this.gDate.toString() + "', '" +
		nextMM + "', '" + nextYYYY + "', '" + this.gFormat + "'" +
		");" +
		"\">><\/A>]</TD><TD ALIGN=center>");
	vCode = vCode + ("[<A HREF=\"" +
		"javascript:Build(" + 
		"'" + this.gReturnItem + "', '" +
		this.gCellID + "', '" + this.gDate.toString() + "', '" +
		this.gMonth + "', '" + (parseInt(this.gYear)+1) + "', '" + this.gFormat + "'" +
		");" +
		"\">>><\/A>]</TD></TR></TABLE><BR>");

	// Get the complete calendar code for the month..
	vCode = vCode + this.getMonthlyCalendarCode();

	vCode = vCode + ("</font>");

	var field=document.getElementById(this.gCellID)
	if (field!=null) field.innerHTML=vCode;


}

Calendar.prototype.cal_header = function() {
	var vCode = "";
	
	vCode = vCode + "<TR>";
	vCode = vCode + "<TD WIDTH='14%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[0] + "</B></FONT></TD>";	// @01
	vCode = vCode + "<TD WIDTH='14%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[1] + "</B></FONT></TD>"; // @01
	vCode = vCode + "<TD WIDTH='14%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[2] + "</B></FONT></TD>"; // @01
	vCode = vCode + "<TD WIDTH='14%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[3] + "</B></FONT></TD>"; // @01
	vCode = vCode + "<TD WIDTH='14%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[4] + "</B></FONT></TD>"; // @01
	vCode = vCode + "<TD WIDTH='14%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[5] + "</B></FONT></TD>"; // @01
	vCode = vCode + "<TD WIDTH='16%'><FONT SIZE='2' FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>" + Calendar.Weekdays[6] + "</B></FONT></TD>"; // @01
	vCode = vCode + "</TR>";
	
	return vCode;
}

Calendar.prototype.cal_data = function() {
	var vDate = new Date();
	vDate.setDate(1);
	vDate.setMonth(this.gMonth);
	vDate.setFullYear(this.gYear);

	var vFirstDay=vDate.getDay();
	var vDay=1;
	var vLastDay=Calendar.get_daysofmonth(this.gMonth, this.gYear);
	var vOnLastDay=0;
	var vCode = "";

	var prevMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, -1);
	var prevMM = prevMMYYYY[0];
	var prevYYYY = prevMMYYYY[1];
	var prevLastDay = Calendar.get_daysofmonth(prevMM, prevYYYY);
	
	/*
	Get day for the 1st of the requested month/year..
	Place as many blank cells before the 1st day of the month as necessary. 
	*/

	vCode = vCode + "<TR>";
	for (i=0; i<vFirstDay; i++) {
		m = i + prevLastDay - vFirstDay + 1
		vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(i) + 
		"><FONT SIZE='2' FACE='" + fontface + "' COLOR='gray'>" + m + "</FONT></TD>";
	}

	// Write rest of the 1st week
	for (j=vFirstDay; j<7; j++) {
		vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT SIZE='2' FACE='" + fontface + "'>" + 
			"<A HREF='#' " +
				"onClick=\"document." + this.gReturnItem + ".value='" + 
				this.format_data(vDay) + "';" +
				"Build(" + 
				"'" + this.gReturnItem + "', '" +
				this.gCellID + "', '" + (parseInt(this.gMonth)+1) + "/" + vDay + "/" + this.gYear + "', '" +
				this.gMonth + "', '" + this.gYear + "', '" + this.gFormat + "');" +
				"\">" +
				this.format_day(vDay) + 
			"</A>" + 
			"</FONT></TD>";
		vDay=vDay + 1;
	}
	vCode = vCode + "</TR>";

	// Write the rest of the weeks
	for (k=2; k<7; k++) {
		vCode = vCode + "<TR>";

		for (j=0; j<7; j++) {
			vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT SIZE='2' FACE='" + fontface + "'>" + 
				"<A HREF='#' " + 
					"onClick=\"document." + this.gReturnItem + ".value='" + 
					this.format_data(vDay) + "';" +
					"Build(" + 
					"'" + this.gReturnItem + "', '" +
					this.gCellID + "', '" + (parseInt(this.gMonth)+1) + "/" + vDay + "/" + this.gYear + "', '" +
					this.gMonth + "', '" + this.gYear + "', '" + this.gFormat + "');" +
					"\">" +
					this.format_day(vDay) + 
				"</A>" + 
				"</FONT></TD>";
			vDay=vDay + 1;

			if (vDay > vLastDay) {
				vOnLastDay = 1;
				break;
			}
		}

		if (j == 6)
			vCode = vCode + "</TR>";
		if (vOnLastDay == 1)
			break;
	}
	
	// Fill up the rest of last week with proper blanks, so that we get proper square blocks
	for (m=1; m<(7-j); m++) {
		vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j+m) + 
		"><FONT SIZE='2' FACE='" + fontface + "' COLOR='gray'>" + m + "</FONT></TD>";
	}
	
	return vCode;
}

Calendar.prototype.format_day = function(vday) {
	var vNowDay = this.gDate.getDate();
	var vNowMonth = this.gDate.getMonth();
	var vNowYear = this.gDate.getFullYear();

	if (vday == vNowDay && this.gMonth == vNowMonth && this.gYear == vNowYear)
		return ("<FONT COLOR=\"RED\"><B>" + vday + "</B></FONT>");
	else
		return (vday);
}

Calendar.prototype.write_weekend_string = function(vday) {
	var i;

	// Return special formatting for the weekend day.
	for (i=0; i<weekend.length; i++) {
		if (vday == weekend[i])
			return (" BGCOLOR=\"" + weekendColor + "\"");
	}
	
	return "";
}

Calendar.prototype.format_data = function(p_day) {
	var vData;
	var vMonth = 1 + this.gMonth;
	vMonth = (vMonth.toString().length < 2) ? "0" + vMonth : vMonth;
	var vMon = Calendar.get_month(this.gMonth).substr(0,3).toUpperCase();
	var vFMon = Calendar.get_month(this.gMonth).toUpperCase();
	var vY4 = new String(this.gYear);
	var vY2 = new String(this.gYear.substr(2,2));
	var vDD = (p_day.toString().length < 2) ? "0" + p_day : p_day;

	switch (this.gFormat) {
		case "MM\/DD\/YYYY" :
			vData = vMonth + "\/" + vDD + "\/" + vY4;
			break;
		case "MM\/DD\/YY" :
			vData = vMonth + "\/" + vDD + "\/" + vY2;
			break;
		case "MM-DD-YYYY" :
			vData = vMonth + "-" + vDD + "-" + vY4;
			break;
		case "MM-DD-YY" :
			vData = vMonth + "-" + vDD + "-" + vY2;
			break;

		case "DD\/MON\/YYYY" :
			vData = vDD + "\/" + vMon + "\/" + vY4;
			break;
		case "DD\/MON\/YY" :
			vData = vDD + "\/" + vMon + "\/" + vY2;
			break;
		case "DD-MON-YYYY" :
			vData = vDD + "-" + vMon + "-" + vY4;
			break;
		case "DD-MON-YY" :
			vData = vDD + "-" + vMon + "-" + vY2;
			break;

		case "DD\/MONTH\/YYYY" :
			vData = vDD + "\/" + vFMon + "\/" + vY4;
			break;
		case "DD\/MONTH\/YY" :
			vData = vDD + "\/" + vFMon + "\/" + vY2;
			break;
		case "DD-MONTH-YYYY" :
			vData = vDD + "-" + vFMon + "-" + vY4;
			break;
		case "DD-MONTH-YY" :
			vData = vDD + "-" + vFMon + "-" + vY2;
			break;

		case "DD\/MM\/YYYY" :
			vData = vDD + "\/" + vMonth + "\/" + vY4;
			break;
		case "DD\/MM\/YY" :
			vData = vDD + "\/" + vMonth + "\/" + vY2;
			break;
		case "DD-MM-YYYY" :
			vData = vDD + "-" + vMonth + "-" + vY4;
			break;
		case "DD-MM-YY" :
			vData = vDD + "-" + vMonth + "-" + vY2;
			break;

		default :
			vData = vMonth + "\/" + vDD + "\/" + vY4;
	}

	return vData;
}

function Build(p_item, p_cellid, p_date, p_month, p_year, p_format) {
	myDate = new Date(p_date);
	gCal = new Calendar(p_item, p_cellid, myDate, p_month, p_year, p_format);
	//gCal = new Calendar(p_item, null, p_month, p_year, p_format);

	// Customize your Calendar here..
	gCal.gBGColor="white";
	gCal.gLinkColor="black";
	gCal.gTextColor="black";
	gCal.gHeaderColor="darkgreen";

	gCal.refresh();
}

// @01
function setCalendarMonthNames(monthNames) {

	// Parse month list for the month names.  The list contains the 12 full month names			
	// followed after the 12 abbreviated names for a total of 24 names, each delimited by
	// a ";". We are going to ignore the abbreviated names 											
	var idxStart = 0;																
	var idxEnd;																		
	for (i=0; i < 12; i++)															
	{																				
		idxEnd	= monthNames.indexOf(";",idxStart);										
		Calendar.Months[i] = monthNames.substr(idxStart,idxEnd-idxStart);				
		idxStart	= idxEnd+1;															
	}
}

// @01
function setCalendarWeekDayAbbrNames(weekDayNames) {

	// Parse month list for the weekday names.  The list contains the 7 full weekday names			
	// followed after the 7 abbreviated names for a total of 14 names, each delimited by
	// a ";". We are going to ignore the full names and save the abbreviated ones.
	
	idxStart = 0;
	var idxEnd;																			
	for (i=0; i < 14; i++)																
	{																					
		idxEnd	= weekDayNames.indexOf(";",idxStart);
		// Ignore the 1st 7 names since they are the full names.  We just want the 
		// abbreviated names.
		if (i >= 7)
		{								
			Calendar.Weekdays[i-7] = weekDayNames.substr(idxStart,idxEnd-idxStart);				
		}
		idxStart	= idxEnd+1;														
	}
}

function show_calendar() {
    /* 
	    p_item	: Return Item.  Should be in "formname.fieldname" format. (REQUIRED)
	    p_cellid: Return Item.  Should be in "formname.fieldname" format. (REQUIRED)
	    p_weekdayNames	: String containing weekday names followed by their abbreviations.  Delimited by ";".  (REQUIRED)
	    p_monthNames	: String containing month names followed by their abbreviations.  Delimited by ";".  (REQUIRED)
	    p_date  : date that should look selected.  (OPTIONAL)
	    p_month : 0-11 for Jan-Dec; 12 for All Months. (OPTIONAL)
	    p_year	: 4-digit year (OPTIONAL)
	    p_format: Date format (mm/dd/yyyy, dd/mm/yy, ...) (OPTIONAL)
    */

    p_item = arguments[0];
    p_cellid = arguments[1];
    p_monthNames = arguments[2];	// @01
    p_weekdayNames = arguments[3];  // @01

    if (eval(p_item) != null)
    {
	var my_value=eval(p_item+".value");

	if (my_value == null || my_value == "")
	{
		myDate = new Date();
		p_date = myDate.getMonth()+1 + "/" + myDate.getDate() + "/" + myDate.getFullYear()
	}
	else
	{
		p_date = my_value;
		myDate = new Date(p_date);
	}
	if (arguments[5] == null)
		p_month = new String(myDate.getMonth());
	else
		p_month = arguments[5];
	if (arguments[6] == "" || arguments[6] == null)
		p_year = new String(myDate.getFullYear().toString());
	else
		p_year = arguments[6];
	if (arguments[7] == null)
		p_format = "MM/DD/YYYY";
	else
		p_format = arguments[7];

	// Set Month and weekday names		
	setCalendarMonthNames(p_monthNames);			// @01
	setCalendarWeekDayAbbrNames(p_weekdayNames);	// @01

	//document.getElementById("debug_cell").innerHTML=p_date;
	Build(p_item, p_cellid, p_date, p_month, p_year, p_format);
    }
}