//
// Enhanced JavaScript Event Calendar
//
// Author:  Rick Pike
// Website: http://calendar.pikesys.com
// Email: calendar@pikesys.com
//'Version 0.3 - (07-May-2004)
//
// based on an earlier script by Kevin Ilsen (http://calendar.ilsen.net or kevin@ilsen.net)

// Configurable values are set to defaults here; you can override them before calling Calendar( ) from your HTML page

var SpecialDay=1;	// 1=Sunday, 2=Monday, . . . 7=Saturday
var ColorBackground="ffffcc";
var ColorSpecialDay = "red";
var ColorToday = "green";
var ColorEvent = "blue";
var showAltDate = false;  	// add display of alternate date using results from user supplied "getAltMonth(dy, mo, yr, last)" and "getAltDate(dy, mo, yr)" functions
var showHolidays = false; 	// add display of holidays using result from user supplied "holidays(dy, mo, yr)" function
var showAltHoly = false; 	// add display of alternate holidays using result from user supplied "getAltHoly(dy, mo, yr)" function
var showMsgBox = true; 	// span empty cells (before 1st day and after last) for messageBox use
var showMini = true; 		// add minimonth display of prior and next months if first and/or last boxes are available 
var showNav = true; 		// enable month navigation (might disable for print version)
var showImages = true; 	// enable event images (might disable for print version)
var showLinks = true; 		// enable event hyperlinks (might disable for print version)
//var msgBoxColor = "#ffcc99";
//var navColor = "#ffff99";
//var imageAlign = "left"; 	// default event image alignment
var imageScale = 100;		// percent scale factor for images
var altAlign = true; 		// alternate left/right alignment of event images on same date for readability
var DefaultFormat = "custom"; // for compatibility; set to "layer" to simplify formatting
var ExportPage = ""; 		// name of html page for displaying event text for export
var PrintPage = ""; 		// name of html page for printer-friendly format

// all format codes must have "|" to separate before and after tags
var DateFontSize=5;
//var AltDateFormat = "<font color=#999999 size=2>|</font>";
//var MonthFormat = "<font size=" + DateFontSize + "><b>|</b></font>";
//var AltMonthFormat = "<br><font color=#999999 size=" + DateFontSize/2 + ">|</font>";
//var HolidayFormat = "<font color=#999999 size=2><b><center>|</center></b></font>";
var HolidayFormat = "<font color=#999999><b>|</b></font>";
//var AltHolyFormat = "<font  size=2><b><center>|</center></b></font>";
//var DefaultLayerFormat = "<font size=2>|</font>";

//var defaultMsgBox = "Note: The information here may not be current; please confirm dates and times.<p>";

// Initialize the range of the calendar to Jan - Dec of the current year.
// Event definitions will change this as needed; or it can be explicitly
// overridden before calling Calendar( ) from the HTML page.

var today = new Date();
var FirstMonth=GetFullYear(today) * 100 + 1;
var LastMonth=FirstMonth + 11;

// Layers[] is an array of layer names and default formats. Call DefineLayer( ) to add the
// layer name and corresponding format. New layer names in event definitions will
// be added automatically (watch case and spelling).

//var Layers = new Array;
//var LayerString = "|";
//var layerCount = 0;
//var layerChange = false;

// MsgBoxes[] is a SPARSE array; Call AddMsgBox( ) to populate it

//var MsgBoxes = new Array;

// Events[] is a SPARSE array; Call AddEvent( ) to populate it or DefineEvent( ) for
// compatibility with existing calendar definition scripts.

var Events = new Array;

// Each event is defined by calling the AddEvent( ) routine with the following parameters:
//
//   AddEvent(Date, Description, Layer, Format, Link, Image, Width, Height, Align, Alt)
//        Date is a numeric value in the format YYYYMMDD
//        Description is a string (may include embedded HTML tags such as <BR>, <strong>, etc.)
//        Layer is an event category whose display on the calendar can be toggled on/off by the user
//        Format specifies the source of the format info for Description. Note that any embedded
//        formats in Description will still be applied; this argument is primarily to provide
//        a more convenient way to specify formats. 
//            "layer" = use default format from layer definition (plus any embedded tags!)
//            "custom" = only use format tags embedded in Description string
//            "<...>|</...>" = series of before and after tags separated by a "|" to wrap around
//               Description (plus any embedded tags!)  
//        Link is the URL of the target page if a hyperlink is desired from this event entry
//        Image is the URL of the image if you want to display an image with this event
//        Width is the width of the image in pixels
//        Height is the height of the image in pixels
//        Align is the alignment of the image such as "left", or "right"
//        Alt is the alternate text of the image (for mouseover or non-graphic browser)

// The function DefineEvent(Date, Description, Link, Image, Width, Height) is used
// for compatibility with previous calendar definition scripts

// Event constructor
function Event(description, layer, format, link, image, width, height, align, alt) {

	this.description = description;
	if (link) this.link = link;
	if (image) {
	   this.image = image;
	   if (width) this.width = width;
	   if (height) this.height = height;
	   if (align) this.align = align;
	   if (alt) this.alt = alt;
	   //alert("Event: ("+this.width+","+this.height+")");
	}
	//this.layer = (layer ? layer : "default");	 	// must have some associated layer
	
	if (format) {
	   if (CheckFormat(format)) this.format = format;
	}
}

// Compatibility function for existing calendar definition scripts
function DefineEvent(Date, Description, Link, Image, Width, Height) {
	AddEvent(Date, Description, "", "", Link, Image, Width, Height, "", "");
}

function AddEvent(Date, Description, Layer, Format, Link, Image, Width, Height, Align, Alt) {
	var i;

	if (!Events[Date]) Events[Date] = new Array;
	i = Events[Date].length;
	Events[Date][i] = new Event(Description, Layer, Format, Link, Image, Width, Height, Align, Alt);

	// Adjust the minimum and maximum month & year to include this date
	tmp = Math.floor(Date / 100);
	if (tmp < FirstMonth) FirstMonth = tmp;
	if (tmp > LastMonth) LastMonth = tmp;

	// if EventLayer not in Layers, add it
	// NOTE: watch case in DefineLayer and DefineEvent to avoid undesired "duplicates"

	//alert("AddEvent("+Date+","+Description+","+Width+","+Height+"...)");
	//if (Layer && !Layers[Layer]) DefineLayer(Layer);
}

// Layer constructor
function Layer(format, show) {
	if (format) {	
	   if (format.indexOf("|")>0) {
	      this.format = format;
	   } else {
	      alert("Invalid Calendar Format String: " + format);
	   }
	} else {
	   this.format = DefaultLayerFormat;
	}
	this.show = (show=="false" ? "false" : "true");	// watch boolean vs. string arg
}

function DefineLayer(LayerName, LayerFormat, LayerShow) {
	Layers[LayerName] = new Layer(LayerFormat, LayerShow);
	layerCount++;
}

// Utility function to populate an array with values
function arr() {
	for (var n=0;n<arr.arguments.length;n++) {
		this[n+1] = arr.arguments[n];
	}
}

// Create the array of month names (used in various places)
var months = new arr("January","February","March","April","May","June","July","August","September","October","November","December");

// Calendar( ) is the only routine that needs to be called to display the calendar
var pre, post, tmp, gloMo, gloYr, gloYearmonth;

function UpcomingEvents( ) {
	var curdy, curmo, curyr, yr, mo, dy, firstday, yearmonth, bgn, firstdate, lastdate, jump;
	var weekdays = new arr("Sun","Mon","Tue","Wed","Thu","Fri","Sat");
	var thispage = window.location.pathname;

	// Get info about Easter Dates
	var y1 = Math.floor(FirstMonth/100)
	var y2 = Math.floor(LastMonth/100)
	GetEasterDates(y1,y2)

	// Save current day and month for comparison
	curdy = today.getDate();
	curmo = today.getMonth()+1;
	curyr = GetFullYear(today);
	
	mo = curmo;
	yr = GetFullYear(today);
	yearmonth = (yr * 100) + mo;

	// Create a date object for the first day of the desired month
	bgn = new Date(months[mo] + " 1," + yr);
	// Get the day-of-week of the first day, and the # days in the month
	firstday = bgn.getDay();
	lastdate = NumDaysIn(mo,yr);
	lastday = 1+(firstday + lastdate - 1)%7;
	prev = next = "&nbsp;";

	if (showAltDate) {
		parseFormat(AltMonthFormat);
		altMonth = getAltMonth(1, mo, yr, lastdate);
		tmp += pre + (altMonth ? altMonth : "") + post;
	}
	
	//create table
	//tmp = "<TABLE BORDER=2 WIDTH=100% CELLPADDING=5>";
	//tmp = "<TABLE BORDER=0 CELLPADDING=10>";
	//document.write(tmp);

	for (var j=0; j<=1; j++) {			//loop through this month and next month
		if (j == 0) {
			mo = curmo;
			yr = GetFullYear(today);
			firstdate = curdy;
			lastdate = NumDaysIn(mo,yr);
		} else {						// handle in case go longer than 1 month
			mo = curmo + j;
			if (mo > 12) {
				mo -= 12;
				yr++;
			}
			firstdate = 1;
			lastdate = NumDaysIn(mo,yr);
		}

		//write Month name and year
		//create table
		//tmp = "<TABLE BORDER=0 WIDTH=100% CELLPADDING=3>";
		tmp = "<TABLE BORDER=0 WIDTH=100% CELLPADDING=0>";
		document.write(tmp);
		
		tmp = "<caption>";
		tmp = "<FONT SIZE=" + 4 + "><B>";
		tmp += months[mo] + " " + yr;
		tmp += next + "</B></FONT></caption>";
		document.write(tmp);
		
		for (var k=firstdate; k<=lastdate; k++) {
			ShowDate(yr,mo,k,i,curmo,curdy);
		}
		
	//close table
	tmp = next + "</TABLE>";
	document.write(tmp);
	}

}

function ShowDate(yr, mo, dy, dayofweek, currentmonth, currentday) {

	var ind, DayHighlighted, tmp, event;
	var next = "&nbsp;";
	//var ShowDay=0;
	
	//tmp = "<FONT SIZE=" + DateFontSize;	// Note open tag!	
	//DayHighlighted = false;
	//document.write("--> dy = " + dy + '<BR>');

	//if ((mo == currentmonth) && (dy == currentday)) {
	//	tmp += " COLOR=" + ColorToday;
	//	DayHighlighted = true;
	//} else if (dayofweek == SpecialDay) {
	//	tmp += " COLOR=" + ColorSpecialDay;
	//	DayHighlighted = true;
	//}

	ind = (((yr * 100) + mo) * 100) + dy;
	
	//if (showAltDate) {
	//	altDate = getAltDate(dy, mo, yr);
	//	parseFormat(AltDateFormat);
	//	document.write("<TD ALIGN=RIGHT>" + pre + altDate + post + "</TD>");
	//}
	//document.write("</TR></TABLE>");

	//if (showAltHoly) {
	//	tmp = getAltHoly(dy,mo,yr);
	//	if (tmp) {
	//		parseFormat(AltHolyFormat);
	//		document.write(pre + tmp + post + "<BR>");
	//	}
	//}
	
	//if (showHolidays) {
	//	tmp = holidays(dy,mo,yr);
	//	if (tmp) {
	//		ShowDay = 1;
	//		//parseFormat(HolidayFormat);
	//		//document.write(pre + tmp + post + "<BR>");
	//	}
	//}
	
	//if (Events[ind] || (ShowDay == 1)) {
	if (Events[ind]) {
		//start a new row
		tmp = "<TR>";
		tmp += "<td width=10%>" + next + "</td>"		//blank cell
	
		tmp += "<td width=10% valign=top align=center><font size=4>"
		tmp += dy
		tmp += next + "</font></td>"

		tmp += "<td width=80% valign=top><font size=3>"
	}
	
	//if (ShowDay == 1) {
	//	tmp = holidays(dy,mo,yr);
	//	if (tmp) {
	//		//ShowDay = 1;
	//		//parseFormat(HolidayFormat);
	//		//document.write(pre + tmp + post + "<BR>");
	//		document.write(tmp  + "<BR>");
	//	}
	//}

//	document.write("<P><FONT SIZE=1>" + event + "</FONT>");

	images=0;
	for (j in Events[ind]) {
		ev = Events[ind][j];
		
		if (j == 0) {
			tmp += ev.description
		} else {
			tmp += next + "<br>" + ev.description
		}
		
		if (j == Events[ind].length-1) {
			tmp += next + "</font></td>"
			tmp += "</TR>";
			document.write(tmp);
		}

		//document.write("    event = " + ev.description + '<BR>');

		
		// with(Events[ind][j]) { // greatly improves readability of following
		//for (k in ev) { alert("ev["+k+"]="+ev[k]) }
		//  document.write("Events[" + ind + "][" + j + "][" + k + "] = " + EscapeLtGt(Events[ind][j][k]), "<br>");
		//alert("-> Layers[Events["+ind+"]["+j+"]."+ev.layer+"].show="+Layers[ev.layer].show);
		//tmp = "";		
		//if (Layers[ev.layer].show == "true") {
			//alert("(+)showing event for "+ind+" in layer "+ev.layer);
			// Build the HTML string for this event
			//tmp += (j>0 ? "<br>" : "");
			//if (ev.image && showImages) {
			//	if (ev.align) {
			//		align = ev.align;
			//	} else if (altAlign && images>0) {
			//		align = (lastAlign=="left" ? "right" : "left");
			//	} else {
			//		align = imageAlign;
			//	}
			//	tmp += '<img src="' + ev.image + 
			//		   (ev.width ? '"  width="' + ev.width*imageScale/100 : '') +
			//		   (ev.height ? '" height="' + ev.height*imageScale/100 : '') +
			//		   (ev.alt ? '" alt="' + ev.alt : '') +					   
			//		   '" align="' + align + '" valign="top">';
			//	lastAlign = align;
			//	images++;
			//}
			//format = "";
			//if (ev.format == "layer") { // use format from layer (and embedded tags)
			//	format = Layers[ev.layer].format;
			//} else if (ev.format == "custom") { // use only embedded tags
			//	format = "";
			//} else if (ev.format) { 	// format string?
			//	if (CheckFormat(ev.format)) format = ev.format;
			//} else if (DefaultFormat == "layer") { // use format from layer if no custom format
			//	format = Layers[ev.layer].format;
			//}
			//parseFormat(format);
			//tmp += pre + (ev.link && showLinks ? ev.description.link(ev.link) : ev.description) + post + "<br>";
			//tmp += pre + (ev.link && showLinks ? "<a class=\"eventlink\" href="+ev.link+">"+ev.description+"</a>" : ev.description) + post + "<br>";
			//tmp += ev.description + "<br>";
			
		//} else {
			//alert("(-)skipping event for "+ind+" in layer "+ev.layer);
		//}
	//document.write("<FONT SIZE=3>" + tmp + "</FONT>");
	}
}



// Display a date in the appropriate color, with events (if there are any)

function ShowDate_orig(yr, mo, dy, dayofweek, currentmonth, currentday) {

	var ind, DayHighlighted, tmp, event;

	//tmp = "<TABLE><TR VALIGN=TOP><TD ALIGN=LEFT WIDTH=10%>";
	//tmp = "<TABLE><TR VALIGN=TOP><TD ALIGN=LEFT WIDTH=10% BGCOLOR='#00ff00'>";
	if ((mo == currentmonth) && (dy == currentday)) {
		 tmp = "<TABLE><TR VALIGN=TOP><TD ALIGN=LEFT WIDTH=10% BGCOLOR='#00ff00'>";
	} else {
		tmp = "<TABLE><TR VALIGN=TOP><TD ALIGN=LEFT WIDTH=10%>";
	}
	tmp += "<FONT SIZE=" + DateFontSize;	// Note open tag!	
	DayHighlighted = false;

	if ((mo == currentmonth) && (dy == currentday)) {
		tmp += " COLOR=" + ColorToday;
		DayHighlighted = true;
	} else if (dayofweek == SpecialDay) {
		tmp += " COLOR=" + ColorSpecialDay;
		DayHighlighted = true;
	}

	ind = (((yr * 100) + mo) * 100) + dy;
	if (Events[ind]) {
		//event = Events[ind];
		if (!DayHighlighted) tmp += " COLOR=" + ColorEvent;
//	} else {
//		event = "&nbsp;<BR>&nbsp;";
	}
	
	tmp += "><B>" + dy + (dy<10 ? "&nbsp;" : "") + "&nbsp;</B></FONT></TD>";	 	// close tag
	document.write(tmp);
	
	if (showAltDate) {
		altDate = getAltDate(dy, mo, yr);
		parseFormat(AltDateFormat);
		document.write("<TD ALIGN=RIGHT>" + pre + altDate + post + "</TD>");
	}
	document.write("</TR></TABLE>");

	if (showAltHoly) {
		tmp = getAltHoly(dy,mo,yr);
		if (tmp) {
			parseFormat(AltHolyFormat);
			document.write(pre + tmp + post + "<BR>");
		}
	}
	
	if (showHolidays) {
		tmp = holidays(dy,mo,yr);
		if (tmp) {
			parseFormat(HolidayFormat);
			document.write(pre + tmp + post + "<BR>");
		}
	}
//	document.write("<P><FONT SIZE=1>" + event + "</FONT>");

	images=0;
	for (j in Events[ind]) {
		ev = Events[ind][j];
		// with(Events[ind][j]) { // greatly improves readability of following
		//for (k in ev) { alert("ev["+k+"]="+ev[k]) }
		//  document.write("Events[" + ind + "][" + j + "][" + k + "] = " + EscapeLtGt(Events[ind][j][k]), "<br>");
		//alert("-> Layers[Events["+ind+"]["+j+"]."+ev.layer+"].show="+Layers[ev.layer].show);
		tmp = "";		
		if (Layers[ev.layer].show == "true") {
			//alert("(+)showing event for "+ind+" in layer "+ev.layer);
			// Build the HTML string for this event
			tmp += (j>0 ? "<br>" : "");
			if (ev.image && showImages) {
				if (ev.align) {
					align = ev.align;
				} else if (altAlign && images>0) {
					align = (lastAlign=="left" ? "right" : "left");
				} else {
					align = imageAlign;
				}
				tmp += '<img src="' + ev.image + 
					   (ev.width ? '"  width="' + ev.width*imageScale/100 : '') +
					   (ev.height ? '" height="' + ev.height*imageScale/100 : '') +
					   (ev.alt ? '" alt="' + ev.alt : '') +					   
					   '" align="' + align + '" valign="top">';
				lastAlign = align;
				images++;
			}
			format = "";
			if (ev.format == "layer") { // use format from layer (and embedded tags)
				format = Layers[ev.layer].format;
			} else if (ev.format == "custom") { // use only embedded tags
				format = "";
			} else if (ev.format) { 	// format string?
				if (CheckFormat(ev.format)) format = ev.format;
			} else if (DefaultFormat == "layer") { // use format from layer if no custom format
				format = Layers[ev.layer].format;
			}
			parseFormat(format);
			//tmp += pre + (ev.link && showLinks ? ev.description.link(ev.link) : ev.description) + post + "<br>";
			tmp += pre + (ev.link && showLinks ? "<a class=\"eventlink\" href="+ev.link+">"+ev.description+"</a>" : ev.description) + post + "<br>";
			
		} else {
			//alert("(-)skipping event for "+ind+" in layer "+ev.layer);
		}
	document.write("<FONT SIZE=1>" + tmp + "</FONT>");
	}
}


function initCal(curmo) {

	// create default layer
	if (!Layers["default"]) DefineLayer("default", DefaultLayerFormat);
	
	// Default to current month and year
	mo = curmo;
	yr = GetFullYear(today);
	yearmonth = (yr * 100) + mo;

	// If querystring parameter is present, get the month/year ("calendar.htm?YYYYMM")
	if (location.search.length > 1) {
		yearmonth = parseInt(location.search.substring(1,location.search.length));
		if ((""+yearmonth).length == 6) {
			mo = yearmonth % 100;
			yr = (yearmonth - mo) / 100;
		}
	}

	// Constrain to the range of months with events
	if (yearmonth < FirstMonth) {
		mo = FirstMonth % 100;
		yr = (FirstMonth - mo) / 100;
		yearmonth = FirstMonth;
	}
	if (yearmonth > LastMonth) {
		mo = LastMonth % 100;
		yr = (LastMonth - mo) / 100;
		yearmonth = LastMonth;
	}
	gloMo = mo; gloYr = yr; gloYearmonth = yearmonth;
}

function qw(string) {
	return "&quot;" + string + "&quot;";
}


// Remaining routines are utilities used above

function NumDaysIn(mo,yr) {
	if (mo==4 || mo==6 || mo==9 || mo==11) return 30;
	else if ((mo==2) && LeapYear(yr)) return 29;
	else if (mo==2) return 28;
	else return 31;
}

function LeapYear(yr) {
	return ( (yr%4 == 0 && yr%100 != 0) || yr % 400 == 0 ? true : false );
}

// fixes a Netscape 2 and 3 bug
function GetFullYear(d) { // d is a date object
	var yr = d.getYear();
	return ( yr < 1000 ? yr + 1900 : yr );
}

function PrevMonth(mth) {
	return ( mth == 1 ? 12 : mth - 1 );
}

function NextMonth(mth) {
	return ( mth == 12 ? 1 : mth + 1 );
}

function PrevYearMonth(yrmth) {
	return ( yrmth%100 == 1 ? yrmth-100+11 : yrmth-1 );
}

function NextYearMonth(yrmth) {
	return ( yrmth%100 == 12 ? yrmth-11+100 : yrmth+1 );
}

// Utility routines

function escramVal(j,k){var a,b,c,d,e;a='<a href=\"mai';c='\">';a+='lto:';b=j+'@';e='</a>';b+=k;d=b;return(a+b+c+d+e);}

function parseFormat(format) {
	// pre and post are globals
	pre = post = "";
	if (format) {		
		var sep = format.indexOf("|");
		if (sep > 0) {  // split format into pre and post strings
			pre = format.substring(0, sep);
			post= format.substring(1+sep, format.length);
		}
	}
}