var agt=navigator.userAgent.toLowerCase();
var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));

function DragArea(){
	this.pressed = 0;
	this.resizing = 0;
	this.initEvent;
	this.endEvent;
	this.currentEvent;
}

DragArea.prototype.loadMouseDown = function(e) {
	var	_event  = is_ie ? window.event : e;
	var	_target = is_ie ? window.event.srcElement : e.target;
	var _button = is_ie ? _event.button : _event.which;
	
	if (typeof _event.preventDefault != 'undefined') {
		_event.preventDefault();
	}

	this.pressed = 1;	

	if(_button != 2 && _button != 3) {
		if(_target.id && _target.id.length == 12){
			if (parseInt(_target.id) > 0)
				this.initEvent = _target.id;
		}	
	}	
};

DragArea.prototype.loadMouseMove = function(e) {
	if(!this.pressed) {
		return true;
	}
	var id = is_ie ? window.event.srcElement.id : e.target.id;
	var continues = true;
	var colorCell = function (id,style){
		try {
			document.getElementById(id).style.background = style;
		}
		catch(e)
		{ continues = false; };
	};

	var incHour = function (hour,op){
	if (op == '+')
		(hour%100 >= 30)?hour+=70:hour+=30;
	else
		(hour%100 == 30)?hour-=30:hour-=70;
	return hour;
	};

	if((parseInt(id) > 0) && (id.length == 12)){
		if (this.endEvent < this.initEvent)
			if (id <= this.endEvent)
				for (var hour = parseInt(this.initEvent); hour >= parseInt(id) && continues;hour=incHour(hour,'-')) 
					colorCell(hour,"#EEE");
			else
				for (var hour = parseInt(id); hour >= parseInt(this.endEvent) && continues;hour=incHour(hour,'-')) 
					colorCell(hour,"");
		else
			if (id < this.endEvent)
				for (var hour = parseInt(id); hour <= parseInt(this.endEvent) && continues;hour=incHour(hour,'+'))
					colorCell(hour,"");
			else
				for (var hour = parseInt(this.initEvent); hour <= parseInt(id) && continues;hour=incHour(hour,'+'))
					colorCell(hour,"#EEE");
		this.endEvent=id;
		return true;
	}
};

document.onmousemove = function(event) {_dragArea.loadMouseMove(event);};
document.onmousedown = function(event) {_dragArea.loadMouseDown(event);};
document.onmouseup = function(event) {_dragArea.loadMouseUp(event);};

DragArea.prototype.loadMouseUp = function(e) {
	this.pressed = 0;
	var _event  = is_ie ? window.event : e;
	var id = is_ie ? window.event.srcElement.id : e.target.id;
	var _button = is_ie ? _event.button : _event.which;
	
	if(_button != 2 && _button != 3) {
		if((parseInt(id) > 0) && (id.length == 12))
			if (this.resizing == 0){
				calendar.dialog();
		}else{
			if (confirm(get_lang('Change the end of this event to %1',calendar.parseDate(id2timeStamp(id)))+' ('+id.substr(8,2)+':'+id.substr(10,2)+') ?')){
				changeEvent(this.currentEvent,'edatetime',parseInt((id2timeStamp(id)+1800000)/1000));
			}
			for (var hour = parseInt(_dragArea.initEvent); hour <= parseInt(_dragArea.endEvent);(hour%100 == 30)?hour+=70:hour+=30)
				document.getElementById(hour).style.background = "";
			this.resizing = 0;
		}
	}
}

counter = 0;
DragArea.prototype.moveWindow = function(e,elem) {
	if (this.pressed){
	        var _event  = is_ie ? window.event : e;
		elem.style.left = (_event.clientX - 80) + "px";
		elem.style.top = (_event.clientY - 80) + "px";
	}
}
var _dragArea = new DragArea();