//
// JavaScript Event Calendar
//
// Version: 1.0
// Date: November 15, 1998
// For information: http://members.aol.com/kevinilsen  or kilsen@m-vation.com
//

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

var SpecialDay=1;	// 1=Sunday, 2=Monday, . . . 7=Saturday
var FontSize=2;
var ColorBackground="ffffff";
var ColorSpecialDay = "";
var ColorToday = "red";
var ColorEvent = "blue";
var ColorTodayBackground="cccccc";

// Initialize the range of the calendar to Jan - Dec of the current year.  Calls to DefineEvent( ) will change this
// as needed; it is also possible to explicitly override the range before calling Calendar( ) from the HTML page.

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


// Events[] is a SPARSE array; Call DefineEvent( ) to populate it
var Events = new Array;

// Each event is defined by calling the DefineEvent( ) routine with the following parameters:
//
//   DefineEvent(EventDate, EventDescription, EventLink, Image, Width, Height)
//        EventDate is a numeric value in the format YYYYMMDD
//        EvenDescription is a string that can include embedded HTML tags (e.g., <BR>, <strong>, etc.)
//        EventLink 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

function DefineEvent(EventDate, EventDescription, EventLink, EventDetails, Image, Width, Height) {
	var tmp;

	// Build the HTML string for this event: image (optional), link (optional), and description
	tmp = "";
	if (Image != "")
		tmp = tmp + '<img src="' + Image + '"  width="' + Width + '" height="' + Height + '" align="left" valign="top">';
	if (EventLink != "" || EventDetails != "") 
		tmp = tmp + '<a ';
	if (EventLink != "")
		tmp = tmp + 'href=' + EventLink + ' ';
        if (EventDetails != "")
		tmp = tmp + 'onmouseover="showDiv(\''+ EventDetails +'\')" onmouseout="hideDiv()" ';
	if (EventLink != "" || EventDetails != "") 
		tmp = tmp + ' >';
	tmp = tmp + EventDescription;
	if (EventLink != "" || EventDetails != "") 
		tmp = tmp + '</a>';

	// If an event already exists for this date, append the new event to it.
	if (Events[EventDate])
		Events[EventDate] += "<BR>" + tmp;
	else
		Events[EventDate] = tmp;

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

}


// read events files to obtain events for the calendar mo/yr
function GetEvents( filename ) {
   var nNumLines = 0;

//   document.write( document.FileReader );
   if ( document.FileReader ) {
      document.FileReader.readFile(filename);
      nNumLines = document.FileReader.getNumLines();
      for (var i=0; i<nNumLines; i++){
         var info = document.FileReader.getLine(i).split(";");
         DefineEvent( info[0], info[1], info[2], info[3], null, null, null );
      }
   }
}


// 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

function Calendar() {
	var curdy, curmo, yr, mo, dy, dayofweek, yearmonth, bgn, lastday, jump;
	var weekdays = new arr("Sun","Mon","Tue","Wed","Thu","Fri","Sat");
	var thispage = document.location.pathname;

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

	// 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.html?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;
		}
	}

	// get the events for the calendar
        var event_file = "events/" + yearmonth + ".txt";
 	GetEvents( event_file );

	// 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
	dayofweek = bgn.getDay();
	lastday = NumDaysIn(mo,yr);

	prev = "";
        next = "";
        prev_year=yr;
        next_year=yr;
	if (mo == 1) prev_year=yr-1;
	prev += '<a href="' + thispage + '?'+PrevYearMonth(yearmonth)+'"><img src="images/nav_previous.gif" border="0" alt="'+months[PrevMonth(mo)]+" "+prev_year+'"></a>';
	if (mo == 12) next_year=yr+1;
	next += '<a href="' + thispage + '?'+NextYearMonth(yearmonth)+'"><img src="images/nav_next.gif" border="0" alt="'+months[NextMonth(mo)]+" "+next_year+'"></a>';

	document.write("<TABLE BORDER=2 WIDTH=490 BGCOLOR="+ColorBackground+"><TR><TD ALIGN=CENTER COLSPAN=7><TABLE width=490 border=0><TR><TD width=50>"+prev+"</TD><TD width=390 align=center><FONT SIZE=5><B>"+months[mo]+" "+yr+"</B></FONT></TD><TD width=50 align=right>"+next+"</TD></TR></TABLE></TD></TR><TR>");
	for (var i=1;i<=7;i++){
		document.write("<TD ALIGN=CENTER WIDTH=14%><FONT SIZE="+FontSize+">"+weekdays[i]+"</FONT></TD>");
	}
	document.write("</TR><TR>");
	dy = 1;
	// Special handling for the first week of the month
	for (var i=1;i<=7;i++) {
		// If the day is less than the day of the
		// week determined to be the first day
		// of the month, print a space in
		// this cell of the table.
		if (i <= dayofweek){
			document.write("<TD ALIGN=CENTER><FONT SIZE="+FontSize+">&nbsp;</FONT></TD>");
		}
		// Otherwise, write date and the event,
		// if any, in this cell of the table.
		else {
			ShowDate(yr,mo,dy,i,curmo,curdy,curyr);
			dy++;
		}
	}
	document.write("</TR><TR>");
	
	// Rest of the weeks . . .
	while (dy <= lastday) {
		for (var i=1;i<=7;i++) {
			// If the day is greater than the last
			// day of the month, print a space in
			// this cell of the table.
			if (dy > lastday) {
				document.write("<TD ALIGN=CENTER>&nbsp;</TD>");
			}
			// Otherwise, write date and the event,
			// if any, in this cell of the table.
			else {
				ShowDate(yr,mo,dy,i,curmo,curdy,curyr);
				dy++;
			}
		}
		document.write("</TR><TR>");
	}

	BuildSelectionList(yearmonth, thispage);
	document.write("</TABLE>");
}

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

function ShowDate(yr, mo, dy, dayofweek, currentmonth, currentday, currentyear) {
	var ind, HighlightEvent, tmp;

	document.write("<TD ALIGN=LEFT VALIGN=TOP>");
	if ((mo == currentmonth) && (dy == currentday) && (yr == currentyear)) {
		document.write("<TABLE WIDTH=100% BORDER=0 BGCOLOR="+ColorTodayBackground+"><TR><TD>");
	}
	document.write("<P ALIGN=RIGHT><FONT SIZE="+FontSize);


	HighlightEvent = true;
	if (dayofweek == SpecialDay) {
		//document.write(" COLOR=" + ColorSpecialDay);
		HighlightEvent = false;
	}
	if ((mo == currentmonth) && (dy == currentday) && (yr == currentyear)) {
		document.write(" COLOR=" + ColorToday);
		HighlightEvent = false;
	}
	ind = (((yr * 100) + mo) * 100) + dy;
	if (Events[ind]) {
		tmp = Events[ind];
		if (HighlightEvent) {
			 document.write(" COLOR=" + ColorEvent);
		}
	} 
	else {
		tmp="&nbsp;<BR>&nbsp;";
	}
	document.write( "><B>"+dy+"</B></ALIGN></FONT></P><Font size=1><P align=left>" + tmp + "</align></P></font>");
	if ((mo == currentmonth) && (dy == currentday) && (yr == currentyear)) {
		document.write("</TD></TR></TABLE>");
	}
	document.write("</TD>");
}


// 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) {
	if (((yr % 4 == 0) && yr % 100 != 0) || yr % 400 == 0) return true;
	else return false;
}

// fixes a Netscape 2 and 3 bug
function GetFullYear(d) { // d is a date object
	var yr;

	yr = d.getYear();
	if (yr < 1000)
	yr +=1900;
	return yr;
}

function PrevMonth(mth) {
	if (mth == 1) return 12;
	else return (mth-1);
}

function NextMonth(mth) {
	if (mth == 12) return 1;
	else return (mth+1);
}

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

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

function JumpTo(calendar, thispage) {
	var sel, yrmo;

	sel = document.jumpmonth.monthselect.selectedIndex;
	yrmo = document.jumpmonth.monthselect[sel].value;
        var page_select = thispage + '?' + yrmo;
	window.location.href = unescape(page_select);
	//document.write( unescape(page_select) );
}

function BuildSelectionList(current,thispage) {
	var mo, yr, yearmonth;
	yearmonth = FirstMonth-100;

	document.write('<TR><TD colspan=7 align=center valign=middle><br><FORM name="jumpmonth">Jump to month:&nbsp;&nbsp;');
	var selection = '<select name="monthselect" size=0 onchange=JumpTo(this,\"' + escape(thispage) + '\"); >';
	document.write( selection );

	// get three year period
	while (yearmonth <= LastMonth+100) {
		mo = yearmonth % 100;
		yr = (yearmonth - mo) / 100;
		document.write("<option value=");
		document.write(yearmonth);
		if (yearmonth == current) document.write(" selected");
		document.write(">");
		document.write(months[mo]+" "+yr);
		yearmonth = NextYearMonth(yearmonth);
	}
	document.write("</select>");
	document.write("</FORM></TD></TR>");

}