// Tooltip Object
var Tooltip = Class.create();
Tooltip.prototype = {
    initialize: function(el, options) {
        this.el = $(el);
        this.initialized = false;
        this.setOptions(options);
		
        // Event handlers
        this.showEvent = this.show.bindAsEventListener(this);
        this.hideEvent = this.hide.bindAsEventListener(this);
        this.updateEvent = this.update.bindAsEventListener(this);
        Event.observe(this.el, "mouseover", this.showEvent );
        Event.observe(this.el, "mouseout", this.hideEvent );
		
        // Removing title from DOM element to avoid showing it
        this.content = this.el.title;
        this.el.title = "";

        // If descendant elements has 'alt' attribute defined, clear it
        this.el.descendants().each(function(el){
            if(Element.readAttribute(el, 'alt'))
                el.alt = "";
        });
    },
    setOptions: function(options) {
        this.options = {
            textShadowColor: '', // Default text shadow color (use CSS value)
            maxWidth: 250,	// Default tooltip width
            align: "left", // Default align
            delay: 250, // Default delay before tooltip appears in ms
            mouseFollow: true, // Tooltips follows the mouse moving
            opacity: .75, // Default tooltips opacity
            appearDuration: 0, // Default appear duration in sec
            hideDuration: 0 // Default disappear duration in sec
        };
        Object.extend(this.options, options || {});
    },
    show: function(e) {
        var _offSet = this.el.cumulativeOffset();        
        this.xCord = _offSet[0] - ((223 - this.el.getWidth()) / 2) + 4;
        this.yCord = _offSet[1]+8;
        if(!this.initialized)
            this.timeout = window.setTimeout(this.appear.bind(this), this.options.delay);
    },
    hide: function(e) {
        if(this.initialized) {
            this.appearingFX.cancel();
            if(this.options.mouseFollow)
                Event.stopObserving(this.el, "mousemove", this.updateEvent);
            new Effect.Fade(this.tooltip, {
                duration: this.options.hideDuration,
                afterFinish: function() {
                    Element.remove(this.tooltip)
                }.bind(this)
            });
        }
        this._clearTimeout(this.timeout);
		
        this.initialized = false;
    },
    update: function(e){
        this.xCord = Event.pointerX(e);
        this.yCord = Event.pointerY(e);
        this.setup();
    },
    appear: function() {
        // Building tooltip container
        this.tooltip = Builder.node("div", {
            className: "tooltip",
            style: "display: none;"
        }, [
        Builder.node("div", {
            className:"xtop"
        }, []),
        Builder.node("div", {
            className: "xboxcontent"
            }, this.content),
        Builder.node("div", {
            className:"xbottom"
        }, []),
        ]);
        document.body.insertBefore(this.tooltip, document.body.childNodes[0]);
		
        Element.extend(this.tooltip); // IE needs element to be manually extended
        this.options.width = this.tooltip.getWidth();
        this.tooltip.style.width = this.options.width + 'px'; // IE7 needs width to be defined
		
        this.setup();
		
        if(this.options.mouseFollow)
            Event.observe(this.el, "mousemove", this.updateEvent);
			
        this.initialized = true;
        this.appearingFX = new Effect.Appear(this.tooltip, {
            duration: this.options.appearDuration,
            to: this.options.opacity
        });
    },
    setup: function(){
        // If content width is more then allowed max width, set width to max
        if(this.options.width > this.options.maxWidth) {
            this.options.width = this.options.maxWidth;
            this.tooltip.style.width = this.options.width + 'px';
        }
			
        // Tooltip doesn't fit the current document dimensions
        if(this.xCord + this.options.width >= Element.getWidth(document.body)) {
            this.options.align = "right";
            this.xCord = this.xCord - this.options.width + 20;
        }
		
        this.tooltip.style.left = this.xCord - 7 + "px";
        this.tooltip.style.top = this.yCord + 12 + "px";
    },
    _clearTimeout: function(timer) {
        clearTimeout(timer);
        clearInterval(timer);
        return null;
    }
};