/*
	Static Class: Interface
	----------------------------------------
	Interface is the primary port of call for most scripts.
*/
var Interface = new(function(){
	this._listeners = new Array();
	this.depth = 1;
	this.interval = null;
	
	this._iePngFixPath = 'js/iePngFix.htc';
	
	this.addListener = function(obj){
		this._listeners[this._listeners.length] = obj;
	}
	
	this.onLoad = function(){
		Interface.init();
	}
	
	this.init = function(){
		// to do this is temporary till moved into its own object
		this.fixPng();
		for(var i=0; i < this._listeners.length; i++){
			if(this._listeners[i].init) this._listeners[i].init();
		}
	}
	
	this.fixPng = function(){
		// we only need this for IE so only worry about addRule
		// Make sure we only work on IE 5.5 or 6
		
		if(/MSIE (5\.5|6\.)/.test(navigator.userAgent)){
			var css = document.styleSheets[document.styleSheets.length-1];
			if(css && css.addRule){
				var b = 'behavior: url("' + this._iePngFixPath + '")';
				css.addRule('div', b);
				css.addRule('img', b);
				css.addRule('span', b);
				css.addRule('td', b);
			}
		}
	}
	
	this.resize = function(){
		// resize the interface cover
		for(var i=0; i < this._listeners.length; i++){
			if(this._listeners[i].onResize) this._listeners[i].onResize();
		}
	}
	
	this.onResize = function(){
		clearTimeout(this.interval);
		this.interval = setTimeout(function(){Interface.resize();}, 500);
	}
		
	this.preload = function(){
		var args = this.preload.arguments;
		
		document.imageArray = new Array(args.length);
		for(var i=0; i<args.length; i++){
			document.imageArray[i] = new Image;
			document.imageArray[i].src = args[i];
		}
	}
	
	this.getObjectsByType = function(htmlType, type){
		var objects = document.getElementsByTagName(htmlType);
		var returnObjects = new Array();
		
		if(objects.length > 0){
			for(var i=0; i < objects.length; i++){
				if(objects[i].getAttribute('evance-uiobject')){
					returnObjects[returnObjects.length] = objects[i];
				} 
			}
		}
		return returnObjects;
	}
	
	this.getNextZIndex = function(){
		++this.depth;
		return this.depth;
	}
	
	this.disableSelect = function(target){
		if(typeof target == 'string'){
			target = document.getElementById(target);
		}
		target.onselectstart = function() {
			return false;
		};
		target.unselectable = "on";
		target.style.MozUserSelect = "none";
	}
	
	this.getElementDimensions = function(Elem){
		if(typeof Elem == 'string'){
			if(document.getElementById) {
				var elem = document.getElementById(Elem);
			} else if (document.all){
				var elem = document.all[Elem];
			}
		} else if (typeof Elem == 'object') {
			var elem = Elem;
		} else {
			return false;
		}
		if ((navigator.userAgent.indexOf("Opera 5")!=-1) 
			||(navigator.userAgent.indexOf("Opera/5")!=-1)) { 
			h = elem.style.pixelHeight;
			w = elem.style.pixelWidth;
		} else {
			w = elem.offsetWidth;
			h = elem.offsetHeight;
		}
		elem = null;
		return {_width:w, _height:h};
	}
	
	this.getElementPosition = function (obj){
		if(typeof obj == 'string') obj = document.getElementById(obj);
		var left = 0;
		var top  = 0;
		var e = obj;
		while (e.offsetParent){
			left += e.offsetLeft;
			top  += e.offsetTop;
			e     = e.offsetParent;
		}
		left += e.offsetLeft;
		top  += e.offsetTop;
		return {_x:left, _y:top};
	}
});

/*
	Mouse Information
	----------------------------------------
*/
var Mouse = new ( function () {
	this._listeners = new Array();
	this._x = 0;
	this._y = 0;
	this.isDragging = false;
	
	this.move = function(event){
		Mouse.onMouseMove(event);
	}
	
	this.onMouseMove = function(event){
		event = Event.fix(event);
		this.getCoords(event);
		for(var i=0; i < this._listeners.length; i++){
			if(this._listeners[i].onMouseMove) this._listeners[i].onMouseMove(event);
		}
	}
	
	this.up = function(event){
		Mouse.onMouseUp(event);
	}
	
	this.onMouseUp = function (event){
		event = Event.fix(event);
		this.getCoords(event);
		for(var i=0; i < this._listeners.length; i++){
			if(this._listeners[i].onMouseUp) this._listeners[i].onMouseUp(event);
		}
	}
	
	this.down = function (event){
		Mouse.onMouseDown(event);
	}
	
	this.onMouseDown = function (event){
		event = Event.fix(event);
		this.getCoords(event);
		for(var i=0; i < this._listeners.length; i++){
			if(this._listeners[i].onMouseDown) this._listeners[i].onMouseDown(event);
		}
	}
	
	this.addListener = function(obj){
		this._listeners[this._listeners.length] = obj;
	}
	
	this.getCoords = function(event){
		if(event.pageX || event.pageY){
			this._x = event.pageX;
			this._y = event.pageY;
		} else {
			this._x = event.clientX + document.body.scrollLeft - document.body.clientLeft,
			this._y = event.clientY + document.body.scrollTop  - document.body.clientTop
		}
	}
	
});

/*
	Event Information
	----------------------------------------
*/
Event = {
	fix : function(event){
		if (!event) event = window.event;

		if (event.target) {
			if (event.target.nodeType == 3) event.target = event.target.parentNode;
		} else if (event.srcElement) {
			event.target = event.srcElement;
		}
	
		return event;
	}
}

/*
	Setup Browser Event Monitoring
*/
document.onmousemove = Mouse.move;
document.onmouseup = Mouse.up;
document.onmousedown = Mouse.down;
window.onresize = Interface.onResize;
window.onload = Interface.onLoad;