/***************************************************************************************
	JavaScript Calendar - Digital Christian Design
	//Script featured on and available at JavaScript Kit: http://www.javascriptkit.com
	// Functions
		changedate(): Moves to next or previous month or year, or current month depending on the button clicked.
		createCalendar(): Renders the calander into the page with links for each to fill the date form filds above.
			
***************************************************************************************/

var thisDate = 1;							// Tracks current date being written in calendar
var wordMonth = new Array("January","February","March","April","May","June","July","August","September","October","November","December");
var today = new Date();							// Date object to store the current date
var todaysDay = today.getDay() + 1;					// Stores the current day number 1-7
var todaysDate = today.getDate();					// Stores the current numeric date within the month
var todaysMonth = today.getUTCMonth() + 1;				// Stores the current month 1-12
var todaysYear = today.getFullYear();					// Stores the current year
var monthNum = todaysMonth;						// Tracks the current month being displayed
var yearNum = todaysYear;						// Tracks the current year being displayed
var firstDate = new Date(String(monthNum)+"/1/"+String(yearNum));	// Object Storing the first day of the current month
var firstDay = firstDate.getDay() + 1;					// Tracks the day number 1-7 of the first day of the current month
var lastDate = new Date(String(monthNum+1)+"/0/"+String(yearNum));	// Tracks the last date of the current month
var numbDays = lastDate.getDate();
var calendarString = "";
var eastermonth = 0;
var easterday = 0;


function changedate(buttonpressed) {
	if (buttonpressed == "prevyr") { yearNum--;
	} else if (buttonpressed == "nextyr") { yearNum++;
	} else if (buttonpressed == "prevmo") { monthNum--;
	} else if (buttonpressed == "nextmo") { monthNum++;
	} else if (buttonpressed == "return") { 
		monthNum = todaysMonth;
		yearNum = todaysYear;
	}
	if (monthNum == 0) {
		monthNum = 12;
		yearNum--;
	} else if (monthNum == 13) {
		monthNum = 1;
		yearNum++
	}

	lastDate = new Date(String(monthNum+1)+"/0/"+String(yearNum));
	numbDays = lastDate.getDate();
	firstDate = new Date(String(monthNum)+"/1/"+String(yearNum));
	firstDay = firstDate.getDay() + 1;
	createCalendar();
	document.getElementById("events").innerHTML = "";
	return;
}


function easter(year) {
	// feed in the year it returns the month and day of Easter using two GLOBAL variables: eastermonth and easterday
	var a = year % 19;
	var b = Math.floor(year/100);
	var c = year % 100;
	var d = Math.floor(b/4);
	var e = b % 4;
	var f = Math.floor((b+8) / 25);
	var g = Math.floor((b-f+1) / 3);
	var h = (19*a + b - d - g + 15) % 30;
	var i = Math.floor(c/4);
	var j = c % 4;
	var k = (32 + 2*e + 2*i - h - j) % 7;
	var m = Math.floor((a + 11*h + 22*k) / 451);
	var month = Math.floor((h + k - 7*m + 114) / 31);
	var day = ((h + k - 7*m +114) % 31) + 1;
	eastermonth = month;
	easterday = day;
}

function createCalendar() {
	calendarString = '';
	var daycounter = 0;
	calendarString += '<table id="evtcal" border="0" cellpadding="0" cellspacing="0" align=\"center\">';
	calendarString += '<tr>';
	calendarString += '<td class=\"nav\"     colspan=\"2\" align=\"right\"  valign=\"middle\"><a style=\"font-size:large\" href=\"javascript:changedate(\'prevmo\');\" title=\"Previous Month\">&laquo;</a></td>';
	calendarString += '<td class=\"navyear\" colspan=\"3\" align=\"center\" valign=\"middle\"><b>' + wordMonth[monthNum-1] + '&nbsp;&nbsp;' + yearNum + '</b></td>';
	calendarString += '<td class=\"nav\"     colspan=\"2\" align=\"left\"   valign=\"middle\"><a style=\"font-size:large\" href=\"javascript:changedate(\'nextmo\');\" title=\"Next Month\">&raquo;</a></td>';
	calendarString += '</tr>';
	calendarString += '<tr>';
	calendarString += '<td class=\"navday\">Sun<\/td>';
	calendarString += '<td class=\"navday\">Mon<\/td>';
	calendarString += '<td class=\"navday\">Tue<\/td>';
	calendarString += '<td class=\"navday\">Wed<\/td>';
	calendarString += '<td class=\"navday\">Thu<\/td>';
	calendarString += '<td class=\"navday\">Fri<\/td>';
	calendarString += '<td class=\"navday\" style=\"border-right-style: solid\">Sat<\/td>';
	calendarString += '<\/tr>';

	thisDate = 1;
	for (var i = 1; i <= 6; i++) {
		calendarString += '<tr>';
		for (var x = 1; x <= 7; x++) {
			daycounter = (thisDate - firstDay)+1;
			thisDate++;
			var xtra = "";
			if ( x == 7 ) { xtra = "style='border-right-style: solid'"; }
			if ((daycounter > numbDays) || (daycounter < 1)) {
				calendarString += '<td class=\"noday\">&nbsp;<\/td>';
			} else {
				var s = checkevents(daycounter,monthNum,yearNum,i,x); 
				if ( s.length > 0  || ((todaysDay == x) && (todaysDate == daycounter) && (todaysMonth == monthNum))){
					if ((todaysDay == x) && (todaysDate == daycounter) && (todaysMonth == monthNum)) {
						calendarString += '<td class=\"today\"' + xtra + '><div class=\"daynumber\"' + xtra + '>' + daycounter + '</div><a href=\"javascript:showevents(' + daycounter + ',' + monthNum + ',' + yearNum + ',' + i + ',' + x + ')\">' + s + '<\/a><\/td>';
					} else	{
						calendarString += '<td class=\"dayevents\"' + xtra + '><div class=\"daynumber\"' + xtra + '>' + daycounter + '</div><a href=\"javascript:showevents(' + daycounter + ',' + monthNum + ',' + yearNum + ',' + i + ',' + x + ')\">' + s + '<\/a><\/td>';
					}
				} else {
					calendarString += '<td class=\"dayoff\"' + xtra + '><div class=\"daynumber\"' + xtra + '>' + daycounter + '</div><\/td>';
				}
			}
		}
		calendarString += '<\/tr>';
		if ( daycounter+1 > numbDays) { break; }
	}
	calendarString += '<tr><td colspan=\"7\" nowrap align=\"center\" valign=\"center\" bgcolor=\"#C8C896\" height=\"22\"><a href=\"javascript:changedate(\'return\')\"><b>Show Current Date<\/b><\/a><\/td><\/tr><\/table>';

	var object=document.getElementById('calendar');
	object.innerHTML= calendarString;
	thisDate = 1;
}

function checkevents(day,month,year,week,dayofweek) {
	var numevents = 0;
	var eventTitles = "";
	var floater = 0;
	for (var i = 0; i < events.length; i++) {
		if (events[i][0] == "W") {
			if ((events[i][2] == dayofweek)) { 
				numevents++;
				eventTitles += "<br/>" + events[i][6];
			}
		}
		else if (events[i][0] == "Y") {
			if ((events[i][2] == day) && (events[i][1] == month)) {
				numevents++;
				eventTitles += "<br/>" + events[i][6];
			}
		}
		else if (events[i][0] == "F") {
			if ((events[i][1] == 3) && (events[i][2] == 0) && (events[i][3] == 0) ) {
				easter(year);
				if (easterday == day && eastermonth == month) {
					numevents++;
					eventTitles += "<br/>" + events[i][6];
				}
			} else {
				floater = floatingholiday(year,events[i][1],events[i][2],events[i][3]);
				if ((month == 5) && (events[i][1] == 5) && (events[i][2] == 4) && (events[i][3] == 2)) {
					if ((floater + 7 <= 31) && (day == floater + 7)) {
						numevents++;
						eventTitles += "<br/>" + events[i][6];
					} else if ((floater + 7 > 31) && (day == floater)) {
						numevents++;
						eventTitles += "<br/>" + events[i][6];
					}
				} else if ((events[i][1] == month) && (floater == day)) {
					numevents++;
					eventTitles += "<br/>" + events[i][6];
				}
			}
		}
		else if ((events[i][2] == day) && (events[i][1] == month) && (events[i][3] == year)) {
			numevents++;
			eventTitles += "<br/>" + events[i][6];
		}
	}
	return eventTitles;
	if (numevents == 0) {
		//return false;
	} else {
		//return true;
	}
}


function showevents(day,month,year,week,dayofweek) {
	var theevent = "";
	var floater = 0;
	//var d = document.getElementById("events");
	var title = "Events for " + month + '/' + day + '/' + year;
	var html  = "";
	var j = 0;
	for (var i = 0; i < events.length; i++) {
		// First we'll process recurring events (if any):
		if (events[i][0] != "") {
			if (events[i][0] == "D") {
				html += writeEvent (events[i],j++);
			}
			if (events[i][0] == "W") {
				if ((events[i][2] == dayofweek)) {
					html += writeEvent (events[i],j++);
				}
			}
			if (events[i][0] == "M") {
			}
			if (events[i][0] == "Y") {
				if ((events[i][2] == day) && (events[i][1] == month)) {
					html += writeEvent (events[i],j++);
				}
			}
			if (events[i][0] == "F") {
				if ((events[i][1] == 3) && (events[i][2] == 0) && (events[i][3] == 0) ) {
					if (easterday == day && eastermonth == month) {
						html += writeEvent (events[i],j++);
					} 
				} else {
					floater = floatingholiday(year,events[i][1],events[i][2],events[i][3]);
					if ((month == 5) && (events[i][1] == 5) && (events[i][2] == 4) && (events[i][3] == 2)) {
						if ((floater + 7 <= 31) && (day == floater + 7)) {
							html += writeEvent (events[i],j++);
						} else if ((floater + 7 > 31) && (day == floater)) {
							html += writeEvent (events[i],j++);
						}
					} else if ((events[i][1] == month) && (floater == day)) {
						html += writeEvent (events[i],j++);
					}
				}
			}
		}
		// Now we'll process any One Time events happening on the matching month, day, year:
		else if ((events[i][2] == day) && (events[i][1] == month) && (events[i][3] == year)) {
			html += writeEvent (events[i],j++);
		}
	}
	//d.innerHTML = html;
	html += "<center><a href=\"javascript:hideDialog();\" style='text-decoration: none;'><div class=\"eventclosebutton\">Close</div></a><center>";
	showDialog(title,html,"event");
}

function writeEvent( d, e ) {
	var s = "";
	if ( e > 0 ) { s += "<hr/>"; }
	s += "<b>" + d[6] + "</b><br/>\n";
	if ( d[5].length > 0 ) { s += d[5] + "<br/>\n";	}
	if ( d[4].length > 0 ) { s += d[4] + "\n";	}
	s += "<p>" + d[7] + "</p>\n";
	return s;
}

function writeEventOld( d ) {
	var s = "";
	s += "<p><b>" + d[6] + "</b><br/>\n";
	if ( d[4].length > 0 ) {
		s += d[4] + '<br/><br/>\n';
	}
	s += d[7] + '<hr/></p>\n';
	return s;
}

function floatingholiday(targetyr,targetmo,cardinaloccurrence,targetday) {
// Floating holidays/events of the events.js file uses:
//	the Month field for the Month (here it becomes the targetmo field)
//	the Day field as the Cardinal Occurrence  (here it becomes the cardinaloccurrence field)
//		1=1st, 2=2nd, 3=3rd, 4=4th, 5=5th, 6=6th occurrence of the day listed next
//	the Year field as the Day of the week the event/holiday falls on  (here it becomes the targetday field)
//		1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday, 5=Thurday, 6=Friday, 7=Saturday
//	example: "F",	"1",	"3",	"2", = Floating holiday in January on the 3rd Monday of that month.
//
// In our code below:
// 	targetyr is the active year
// 	targetmo is the active month (1-12)
// 	cardinaloccurrence is the xth occurrence of the targetday (1-6)
// 	targetday is the day of the week the floating holiday is on
//		0=Sun; 1=Mon; 2=Tue; 3=Wed; 4=Thu; 5=Fri; 6=Sat
//		Note: subtract 1 from the targetday field if the info comes from the events.js file
//
// Note:
//	If Memorial Day falls on the 22nd, 23rd, or 24th, then we add 7 to the dayofmonth to the result.
//
// Example: targetyr = 2052; targetmo = 5; cardinaloccurrence = 4; targetday = 1
//	This is the same as saying our floating holiday in the year 2052, is during May, on the 4th Monday
//
var firstdate = new Date(String(targetmo)+"/1/"+String(targetyr));	// Object Storing the first day of the current month.
var firstday = firstdate.getUTCDay();	// The first day (0-6) of the target month.
var dayofmonth = 0;	// zero out our calendar day variable.

	targetday = targetday - 1;

	if (targetday >= firstday) {
		cardinaloccurrence--;	// Subtract 1 from cardinal day.
		dayofmonth = (cardinaloccurrence * 7) + ((targetday - firstday)+1);
	} else {
		dayofmonth = (cardinaloccurrence * 7) + ((targetday - firstday)+1);
	}
return dayofmonth;
}