/**
* This is the AIS Media simple Calendar manager.
* @author Paulo Delgado <pdelgado@aismedia.com>
* 
* Copyright ? 2006 - AIS Media
* www.aismedia.com
*
*/

/**
* Settings go here 
*/
var workingDiv = 'calendar';
var thisDate = new Date();
var thisYear = thisDate.getFullYear();
var thisMonth = thisDate.getMonth();
var workingYear = thisYear;
var workingMonth = thisMonth;
var workingXML = null;

/***********************************
* Start my xmlhttp object.
************************************/
function initXMLHTTP() {
	var xmlhttp;
	/*@cc_on @*/
	/*@if (@_jscript_version >= 5)
  	try {
  		xmlhttp=new ActiveXObject("Msxml2.XMLHTTP")
 	} catch (e) {
  		try {
    			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
  		} catch (E) {
   			xmlhttp=false
  		}
 	}
	@else
 	xmlhttp=false
	@end @*/
	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	 	try {
	  		xmlhttp = new XMLHttpRequest();
	 	} catch (e) {
	  		xmlhttp=false;
	 	}
	}	
	return xmlhttp;
}


// retrieve text of an XML document element, including
// elements using namespaces
function getElementTextNS(prefix, local, parentElem, index) {
    var result = "";
    if (prefix && isIE) {
        // IE/Windows way of handling namespaces
        result = parentElem.getElementsByTagName(prefix + ":" + local)[index];
    } else {
        // the namespace versions of this method 
        // (getElementsByTagNameNS()) operate
        // differently in Safari and Mozilla, but both
        // return value with just local name, provided 
        // there aren't conflicts with non-namespace element
        // names
        result = parentElem.getElementsByTagName(local)[index];
    }
    if (result) {
        // get text, accounting for possible
        // whitespace (carriage return) text nodes 
        if (result.childNodes.length > 1) {
            return result.childNodes[1].nodeValue;
        } else {
        	if(result.firstChild) 
            return result.firstChild.nodeValue;    		
            else 
            	return 'NaN';
        }
    } else {
        return "n/a";
    }
}




function loadCalendar(year, month) {
	if(year == null) {
		year=new Date().getFullYear();
	}
	if(month == null) {
		month= thisMonth;
	}
	workingDiv = 'calendar';
	var wkd = document.getElementById(workingDiv);
	wkd.innerHTML = "Loading...";
	sendMonth = month +1;
	getString = "/calendar/get/" + year + "/" + sendMonth;
	xmlhttp = initXMLHTTP();
	xmlhttp.open("GET",getString,true);
	xmlhttp.onreadystatechange = function() {
		if(xmlhttp.readyState == 4) {
			var html_table = "";
			workingXML = xmlhttp.responseXML;
			
			var events = xmlhttp.responseXML.getElementsByTagName('event');
			if(events.length == 0) {
				//html_table += "<div class='err_message'>No events found in this period.</div>";
			}
			
			matrix = getMatrixOfDays(month, year);
			
			html_table += '\n<div id="page_links">' + "\n" +
			//'<a href="javascript:void(0);" id="previous_year" onclick="previousYear();" title="Previous Year">&lt; &lt;</a>' + "\n" +
			'<a href="javascript:void(0);" id="previous_month" onclick="previousMonth();" title="Previous Month">&lt;</a>' + "\n" +
			'<span id="calendar_head">' + getMonthName(month) + " of " + year + '</span>' +"\n" +
			'<a href="javascript:void(0);" id="next_month" onclick="nextMonth();" title="Next Month">&gt;</a>' + "\n" +
			//'<a href="javascript:void(0);" id="next_year" onclick="nextYear();" title="Next Year">&gt; &gt;</a></div>' + "\n" +
			'</div>\n<table  id="calendar_table">' +"\n";
			
			for( i = 0 ; i < matrix.length ; i++) {    
				if(i == 0) {
					html_table += "<tr><td>S</td><td>M</td><td>T</td><td>W</td><td>T</td><td>F</td><td>S</td></tr>";
				}
				tmpObj = matrix[i];
				html_table += "<tr>\n";
				for(j= 0 ; j < tmpObj.length ; j++) {
				var ttmpp =  '<td valign="top">' + "\n" +  '<a href="" onclick="return false;" class="day_box"><h1>' + tmpObj[j] + '</h1>' + "\n</a></td>";
				for(var k=0 ; k< events.length ; k++) {
					if(tmpObj[j] > 0) {
						if(events[k].getAttribute("day") == parseInt(tmpObj[j])) {
							var eventID =  events[k].getAttribute('id');
							ttmpp  =  '<td valign="top" class="active">' + "\n" +  '<a href="" onclick="showEvent(' + tmpObj[j] + '); return false;" class="day_box"><h1>' + tmpObj[j] + '</h1>' + "\n</a></td>";
						
							
							/* var title = getElementTextNS("", "title", events[k], 0);
							html_table += '<div onclick="showEvent(' + eventID + ');" type="event" class="event" title="'+title+'" >' + "\n" ;
							html_table += title + "\n";
							html_table +=  "</div>";    */
						}
					}
				}
				html_table += ttmpp;
				
				//html_table += '</a></td>';
				}
				html_table += "</tr>";
			}
			html_table += "</table>\n" + '<a href="/" onclick="mySessions();return false;">Go to my Training Sessions</a>';
			wkd.innerHTML = html_table;
			
		}
	}
	xmlhttp.send(null);
	return false;
}


function getMatrixOfDays(month, year) {
	myDate = new Date();
	myDate.setFullYear(year, month, 1);
	monthName = getMonthName(month);
	firstDay = myDate.getDay();
	dayName = getDayName(firstDay);
	numRows = getNumberOfRowsInMonth(month, year);
	numDays = getNumberOfDaysInMonth(month, year);
	/* document.getElementById('message').innerHTML = monthName + ' the 1st of ' + year + " was a " + dayName + "<br/> " + 
		"this month has " + numRows; */
	startCount = 0;
	ret = new Array();
	for(i = 0 ; i < numRows ; i++) {
		tmpArr = new Array();
		for(j=0 ; j<7 ; j++) {
			//tmpArr.push("H");
			//alert("ret[" + i + "][" + j + "]");
			if(startCount > 0) {
				if(startCount > numDays) {
					tmpArr.push("-");	
				} else {
					tmpArr.push("" + startCount);
				}
				startCount++;
			} else {
				if(j == firstDay) {
					startCount =1;
					tmpArr.push("" + startCount);
					startCount++;
				} else {
					tmpArr.push("-");
				}
			}
				
			
		}
		ret.push(tmpArr);
	}
	return ret;
}

function getMonthName(month_number) {
	switch (month_number) {
		case 0: return 'January'; break;
		case 1: return 'February'; break;
		case 2: return 'March'; break;
		case 3: return 'April'; break;
		case 4: return 'May'; break;
		case 5: return 'June'; break;
		case 6: return 'July'; break;
		case 7: return 'August'; break;
		case 8: return 'September'; break;
		case 9: return 'October'; break;
		case 10: return 'November'; break;
		case 11: return 'December'; break;
		default: return "January"; break;
	}
}

function getDayName(dayOfWeek) {
	switch(dayOfWeek) {
		case 0: return 'Sunday'; break;
		case 1: return 'Monday'; break;
		case 2: return 'Tuesday'; break;
		case 3: return 'Wednesday'; break;
		case 4: return 'Thursday'; break;
		case 5: return 'Friday'; break;
		case 6: return 'Saturday'; break;
		
	}
}

function getNumberOfDaysInMonth(month, year) {
	switch(month) {
		case 0: return 31; break;
		case 1: {
			if(year % 4 == 0) {
				return 29;
			} else {
				return 28;
			}
		}
		case 2: return 31; break;
		case 3: return 30; break;
		case 4: return 31; break;
		case 5: return 30; break;
		case 6: return 31; break;
		case 7: return 31; break;
		case 8: return 30; break;
		case 9: return 31; break;
		case 10: return 30; break;
		case 11: return 31; break;
		default: {
			return 31; break;
		}
	}
}

function getNumberOfRowsInMonth(month, year) {
	numDays = getNumberOfDaysInMonth(month, year);
	myDate = new Date();
	myDate.setFullYear(year, month, 1);
	firstDay = myDate.getDay();
	weeks =Math.ceil(numDays / 7,0) +1;
	return weeks;
}

function nextMonth() {
	if(workingMonth == 11) {
		workingMonth = parseInt(0);
		workingYear++;
	} else {
		workingMonth++;
	}
	loadCalendar(workingYear, workingMonth);
}

function previousMonth() {
	if(workingMonth == 0) {
		workingMonth = 11;
		workingYear--;
	} else {
		if(workingMonth == 1) {
			workingMonth = parseInt(0);
		} else {
			workingMonth--;
		}
	}
	loadCalendar(workingYear, workingMonth);
}

function nextYear() {
	workingYear++;
	loadCalendar(workingYear, workingMonth);
}

function previousYear() {
	workingYear--;
	loadCalendar(workingYear, workingMonth);
}


function showEvent(day) {
	var myItems = workingXML.getElementsByTagName('event');
	//var html_table ="<h1>" + getMonthName(workingMonth) + " " + day + " of " + workingYear + "</h1><hr size=1/>";
	var theMonth = workingMonth + 1;
	var html_table ="<h1>" + theMonth + "/" + day + "/" + workingYear + "</h1><hr size=1/>";
	var titles = 'Training Sessions of ' + theMonth + "/" + day + "/" + workingYear + ":<br/>";
	for(var k=0 ; k< myItems.length ; k++) {
		if(myItems[k].getAttribute("day") == parseInt(day)) {
			var title = getElementTextNS("", "title", myItems[k], 0);
			var description = getElementTextNS("", "description", myItems[k], 0);
			var duration = getElementTextNS("", "duration", myItems[k], 0);
			var start_time = getElementTextNS("", "start_time", myItems[k], 0);
			var eventid = myItems[k].getAttribute("id");

			titles += '<a href="#a_' + eventid + '">' + title + " (more &raquo;)</a><br/>";
			
			html_table += '<a name="a_' + eventid + '"><h2>' + title + '</h2></a>' +
			'<span><b>Start time:</b> ' + start_time + ' EST</span><br/>' +
			'<span><b>Duration:</b> ' + duration + '</span> - <a href="/documents/" onclick="rsvp(' + eventid + ');return false;">RSVP NOW</a><br/>' +
			'<div>' + description + '</div><hr size=1/>';
			
		} 
	}
	document.getElementById('calendar_expanded').innerHTML = titles + "<br/>" + html_table;
	return;	 
}


function rsvp(eventid) {
	var accept = confirm('Are you sure you want to RSVP to this Training Session?');
	if(accept) {
		send_rsvp(eventid);
	} else {
		return false;
	}
}

function send_rsvp(eventid) {
	getString = "/calendar/rsvp/" + eventid ;
	xmlhttp = initXMLHTTP();
	xmlhttp.open("POST",getString,true);
	xmlhttp.onreadystatechange = function() {
		if(xmlhttp.readyState == 4) {
			myXml = xmlhttp.responseXML;
			if(myXml.getElementsByTagName('ok').length > 0) {
				alert('Thank you, you have been registered for this training session.');
			} else {
				var error_message = myXml.getElementsByTagName('reason')[0].firstChild.nodeValue;
				alert('Error:\n' + error_message);
			}
		}
	}
	xmlhttp.send("Lead/Event=" + eventid);
}

function mySessions() {
	var xmlhttp = initXMLHTTP();
	xmlhttp.open("GET","/calendar/my",true);
	xmlhttp.onreadystatechange = function() {
		if(xmlhttp.readyState == 4) {
			var myXML = xmlhttp.responseXML;
			events = myXML.getElementsByTagName('training');
			var html_table = "<h2>Upcoming Training Sessions:</h2>";
			if(events.length == 0) {
				html_table += "You are not registered for any of the upcoming training sessions.";
			}
			html_table += "<ul>";
			for(var idx = 0 ; idx < events.length ; idx++) {
				var title = events[idx].getElementsByTagName('title')[0].firstChild.nodeValue;
				var start = events[idx].getElementsByTagName('start')[0].firstChild.nodeValue;
				var duration = events[idx].getElementsByTagName('duration')[0].firstChild.nodeValue;
				
				html_table += "<li><b>" + title + "</b><br/>" + start + " (" + duration + ")<hr size=1/></li>" ;
			}
			html_table+="</ul>";
			document.getElementById('calendar_expanded').innerHTML = html_table;
		}
	}
	xmlhttp.send(null);
}