var curM;
var curY;
function getDaysInMonth(m,y) {
	// months start from 0
	switch (m) {
		case 0:
		case 2:
		case 4:
		case 6:
		case 7:
		case 9:
		case 11: return 31;
		case 3:
		case 5:
		case 8:
		case 10: return 30;
		case 1: { if (y%4==0) return 29; return 28; }
	}
}
var eevents = "";
var httpRequest;

function processRequest(m,y) {
  if (httpRequest.readyState == 4)
  {
    if(httpRequest.status == 200)
    {
      eevents = httpRequest.responseText;
    }
    else
    {
      eevents = "";
    }
    evs = eevents.split("#%%%#");
    
	curM = m;
	curY = y;
	firstday = new Date();
	firstday.setMonth(m);
	firstday.setFullYear(y);
	firstday.setDate(1);
	d = firstday.getDay();
	if (d==0) d=7;
	for (i=1;i<=42;i++) {
    document.getElementById("d"+i).innerHTML = "";
    document.getElementById("d"+i).className = "";
  }
	for (i=d;i<getDaysInMonth(m,y)+d;i++) {
		document.getElementById("d"+i).innerHTML = i-d+1;
		reg = /#%%#/g;
		document.getElementById("d"+i).title = evs[i-d+1]?evs[i-d+1].replace(reg,"\n"):"";
		if (evs[i-d+1]) document.getElementById("d"+i).className = "activeEvent";
		else document.getElementById("d"+i).className = "no";
		document.getElementById("d"+i).onclick = function() { dayClicked(this.innerHTML,m,y); return false; }
		document.getElementById("d"+i).onmouseover = function() { showInfo(this.title); }
		document.getElementById("d"+i).onmouseout = function() { showInfo(-1); }
	}
	document.getElementById("curM").innerHTML = m+1;
	document.getElementById("curY").innerHTML = y;
    
  }
}


function fillCalendar(m,y) {
  document.getElementById("calInfo").innerHTML = "";
  if (window.ActiveXObject)
  {
    httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
  }
  else
  {
    httpRequest = new XMLHttpRequest();
  }
  url = "/kalendar-akci/?display=ajax&y="+y+"&m="+(m+1);
  httpRequest.open("GET", url, true);
  httpRequest.onreadystatechange = function () { processRequest(m,y); } ;
  httpRequest.send(null);
}

function showInfo(i) {
  reg = /\n/g;
  if (i==-1)
    document.getElementById("calInfo").innerHTML = "";
  else if (i)
	 document.getElementById("calInfo").innerHTML = i.replace(reg,"<br />");
}

function initCalendar() {
	now = new Date();
	fillCalendar(now.getMonth(),now.getFullYear());
	document.getElementById("curM").onclick = function() { monthClicked(this); return false; }
	document.getElementById("curY").onclick = function() { yearClicked(this); return false; }
}

function dayClicked(d,m,y) {
  if (m || m==0) m = "-"+(m+1);
  else m = "";
	window.location.href = "/kalendar-akci/?"+"eventDay="+y+m+(d?"-"+d:"");
}
function monthClicked(e) {
  dayClicked(0,curM,curY);
}
function yearClicked(e) {
  dayClicked(0,0,curY);
}

function moveCalendar(dir) {
	curM = curM+dir;
	if (curM<0) { curM=11; --curY; }
	if (curM>11) { curM=0; ++curY; }
	fillCalendar(curM,curY);
	return false;
}

window.onload = initCalendar;