/**
* Lightbox
*
* This libary is used to create a lightbox in a web application.  This library
* requires the Prototype 1.6 library and Script.aculo.us core, effects, and dragdrop
* libraries.  To use, add a div containing the content to be displayed anywhere on 
* the page.  To create the lightbox, add the following code:
*
*	var test;
*	
*	Event.observe(window, 'load', function () {
*		test = new Lightbox('idOfMyDiv');
*	});
*	
*	Event.observe('lightboxLink', 'click', function () {
*		test.open();
*	});
*
*	Event.observe('closeLink', 'click', function () {
*		test.close();
*	});
*     
*/

var Lightbox = Class.create({
	open : function () {
		this._centerWindow(this.container);
		this._fade('open', this.container);
	},
	
	close : function () {
		this._fade('close', this.container);
	},
	
	_fade : function fadeBg(userAction,whichDiv){
		if(userAction=='close'){
			new Effect.Opacity('bg_fade',
					   {duration:.5,
						from:0.5,
						to:0,
						afterFinish:this._makeInvisible,
						afterUpdate:this._hideLayer(whichDiv)});
		}else{
			new Effect.Opacity('bg_fade',
					   {duration:.5,
						from:0,
						to:0.5,
						beforeUpdate:this._makeVisible,
						afterFinish:this._showLayer(whichDiv)});
		}
	},
	
	_makeVisible : function makeVisible(){
		$("bg_fade").style.visibility="visible";
	},

	_makeInvisible : function makeInvisible(){
		$("bg_fade").style.visibility="hidden";
	},

	_showLayer : function showLayer(userAction){
		$(userAction).style.display="block";
	},
	
	_hideLayer : function hideLayer(userAction){
		$(userAction).style.display="none";
	},
	
	_centerWindow : function centerWindow(element) {
		var windowHeight = parseFloat($(element).getHeight())/2; 
		var windowWidth = parseFloat($(element).getWidth())/2;

		if(typeof window.innerHeight != 'undefined') {
            console.log('xerox1');
            if ( window.innerHeight >  $(element).getHeight() && window.innerWidth > $(element).getWidth() ){
                $(element).style.top = Math.round(document.body.offsetTop + ((window.innerHeight - $(element).getHeight()))/2)+'px';
                $(element).style.left = Math.round(document.body.offsetLeft + ((window.innerWidth - $(element).getWidth()))/2)+'px';
            }
            else{ //if window is smaller
                if ( window.innerHeight <  $(element).getHeight() ){
                    $(element).style.top = '10px';
                }
                else{
                    $(element).style.top = Math.round(document.body.offsetTop + ((window.innerHeight - $(element).getHeight()))/2)+'px';
                }
                if ( window.innerWidth < $(element).getWidth() ){
                    $(element).style.left = '10px';
                }
                else{
                    $(element).style.left = Math.round(document.body.offsetLeft + ((window.innerWidth - $(element).getWidth()))/2)+'px';
                }
            }
		} else {
			// if window is bigger than the popup
            if ( document.documentElement.offsetHeight >  $(element).getHeight() && document.documentElement.offsetWidth > $(element).getWidth() ){
                $(element).style.top = Math.round(document.body.offsetTop + ((document.documentElement.offsetHeight - $(element).getHeight()))/2)+'px';
                $(element).style.left = Math.round(document.body.offsetLeft + ((document.documentElement.offsetWidth - $(element).getWidth()))/2)+'px';
            }
            else{ //if window is smaller
                if ( document.documentElement.offsetHeight <  $(element).getHeight() ){
                    $(element).style.top = '10px';
                }
                else{
                    $(element).style.top = Math.round(document.body.offsetTop + ((document.documentElement.offsetHeight - $(element).getHeight()))/2)+'px';
                }
                if ( document.documentElement.offsetWidth < $(element).getWidth() ){
                    $(element).style.left = '10px';
                }
                else{
                    $(element).style.left = Math.round(document.body.offsetLeft + ((document.documentElement.offsetWidth - $(element).getWidth()))/2)+'px';
                }
            }
		}
	},
	
	initialize : function(containerDiv) {
		this.container = containerDiv;
		if($('bg_fade') == null) {
			var screen = new Element('div', {'id': 'bg_fade'});
			document.body.appendChild(screen);
		}
		//new Draggable(this.container);
		this._hideLayer(this.container);
	}
});