// JavaScript Document
var fps = 40;
var isIE = (navigator.appName == "Microsoft Internet Explorer");
var tweenManager;
function TweenManager(){
    this.tweens;
    
    this.init = function(){
        this.tweens = [];
    }
    
    this.push = function(tween){
        this.tweens.push(tween);
    }
    
    this.remove = function(tween){
        //var i = this.tweens.indexOf(tween);
        var i = this.indexOf(tween);
        this.tweens.splice(i, 1);
    }
    
    this.stopTween = function(tween){
        if(tween != null){ tween.stop(); }
    }
    
    this.stopAllTweens = function(tween){
        var l=this.tweens.length;
        for(var i=0;i<l;i++){
            this.stopTween(this.tweens[i]);
        }
    }
    
    this.indexOf = function(tween){
        var l = this.tweens.length;
        for(var i=0;i<l;i++){
            if(this.tweens[i] == tween){
                return i;
            }
        }
        return null;
    }
    
    this.init();
}

function Tween(target,time,tweenProps,otherProps){
    this.target = target;
    this.timer;
    
    this.duration = time;
    this.time = 0;
    this.startTime = 0;
    
    this.tweenProps = tweenProps;
    this.otherProps = otherProps;
    this.tweens;
    this.stepsTaken;
    this.stepsToTake;
    this.ease = "linear";
    
    this.init = function(){
        var thisObj = this;
        
        if(tweenManager == null){
            tweenManager = new TweenManager();
        }
        
        this.initTweens(this.stepsToTake);
        tweenManager.push(this);
        
        if(this.otherProps != null){
            if("ease" in this.otherProps){ this.ease = this.otherProps.ease; }
            if("delay" in this.otherProps){ this.timer = setInterval(function(){ thisObj.startTween() }, thisObj.otherProps.delay); }
        }else{
            this.startTween();
        }
    }
    
    this.startTween = function(){
        this.startTime = this.getTimer();
        
        if(this.timer != null){
            clearInterval(this.timer);
            this.timer = null;
        }
        
        var thisObj = this;
        this.fireCallback("startListener");
        this.timer = setInterval(function(){ thisObj.onEnterFrame() }, 1000/fps);
    }
    
    this.fireCallback = function(p_listener){
        if(this.otherProps != null && this.otherProps.scope != null && this.otherProps[p_listener] != null && this.otherProps[p_listener] != ""){
            this.otherProps.scope[this.otherProps[p_listener]](this);
        }
    }
    
    this.initTweens = function(p_numSteps){
        this.stepsTaken = 0;
        this.tweens = [];
        for(var n in this.tweenProps){
            var obj = new Object();
            obj.prop = n;
            obj.endVal = this.tweenProps[n];
            
            if(typeof(this.target.style[n] == "string")){
                //alert("IS STRING ::: "+this.target.style[n]);
                if(this.target.style[n] == ""){
                    obj.begin = 0;
                    if(obj.prop == "opacity" && obj.endVal == 0){
                        obj.begin = 1;
                    }
                }else{
                    if(obj.prop != "opacity"){
                        obj.begin = parseInt(this.target.style[n]);
                    }else if(isIE){
                        //alert("PARSE INT :: "+this.target.filters.alpha.opacity);
                        obj.begin = this.target.filters.alpha.opacity;
                        if(obj.begin > 0){
                            obj.begin/= 100;
                        }
                        //alert("BEGIN ::: "+obj.begin);
                    }else{
                        obj.begin = parseInt(this.target.style[n]);
                    }
                }
            }else{
                obj.begin = this.target.style[n];
            }
            
            obj.change = obj.endVal - obj.begin;
            obj.distancePerFrame = Math.abs((obj.endVal - obj.begin)/p_numSteps);
            obj.current = obj.begin;
            obj.dir = 1;
            if(obj.endVal < obj.begin){ obj.dir = -1; }
            this.tweens.push(obj);
        }
    }
    
    this.onEnterFrame = function(){
        this.setTime((this.getTimer() - this.startTime) / 1000);
        this.fireCallback("progressStartListener");
    
        var style = this.target.style;
        
        var l = this.tweens.length;
        for(var i = 0;i<l;i++){
            var prop = this.tweens[i].prop;
            var val = Tween[this.ease](this.time,this.tweens[i].begin,this.tweens[i].change,this.duration/1000);
                        
            switch(prop){
                case "left": case "top": case "bottom": case "right": 
                    style[prop] = String(val)+"px";
                    break;
                case "opacity":
                    if(!isIE){
                        style[prop] = val;
                    }else{
                        if(this.target.filters.alpha != undefined){
                            this.target.filters.alpha.opacity = val * 100;
                            //var myVal = Math.round(val * 100);
                            //if(myVal < 1){ myVal = 1; }
                            //this.target.style.filter  = "alpha(opacity=" + myVal + ")";
                            //alert("FADE ::: "+this.target.filters.alpha.opacity);
                        }else{
                            //this.target.filters = "alpha(opacity=0)";
                            //alert("ELSE :: "+this.target.style.filters+" ::: "+val);
                        }
                    }
                    break;
                default:
                    style[prop] = val;
                    break;
            }
        }
        this.fireCallback("progressListener");
        
        if(this.time >= (this.duration/1000)){
            this.endInterval();    
        }
    }
    
    this.endInterval = function(){
        clearInterval(this.timer);
        this.timer = null;
        this.finalize();
    }
    
    this.finalize = function(){
        var style = this.target.style;
        var l = this.tweens.length;
        for(var i = 0;i<l;i++){
            var prop = this.tweens[i].prop;
            switch(prop){
                case "left": case "top": case "bottom": case "right": 
                    style[prop] = String(this.tweens[i].endVal)+"px";
                    break;
                case "opacity":
                    if(!isIE){
                        style[prop] = this.tweens[i].endVal;
                    }else{
                        if(this.target.filters.alpha != undefined){
                            //if(this.tweens[i].endVal == 0){
                            //    this.target.filters.alpha.opacity = 100;
                                //this.target.style.filter = "alpha(opacity=1)";
                            //}else{
                                this.target.filters.alpha.opacity = this.tweens[i].endVal * 100;
                                //this.target.style.filter = "alpha(opacity=" + this.tweens[i].endVal * 100 + ")";
                            //}
                            //alert(this.tweens[i].endVal);
                            //alert("FADE ::: "+this.target.filters.alpha.opacity);
                        }else{
                            //this.target.filters = "alpha(opacity=0)";
                            //alert("ELSE :: "+this.target.style.filters+" ::: "+val);
                        }
                    }
                    break;
                default:
                    style[prop] = this.tweens[i].endVal;
                    break;
            }
            
        }
        tweenManager.remove(this);
        this.fireCallback("completeListener");
    }
    
    this.getTimer = function(){
        return new Date().getTime() - this.time;
    }
    
    this.setTime = function(p_time){
        this.time = p_time;
    }
    
    this.stop = function(){
        this.endInterval();
    }
    this.init();
}
/* borrowed easing functionality */
Tween.backEaseIn = function(t,b,c,d,a,p){
    if (s == undefined) var s = 1.70158;
    return c*(t/=d)*t*((s+1)*t - s) + b;
}
Tween.backEaseOut = function(t,b,c,d,a,p){
    if (s == undefined) var s = 1.70158;
    return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
}
Tween.backEaseInOut = function(t,b,c,d,a,p){
    if (s == undefined) var s = 1.70158; 
    if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
    return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
}
Tween.elasticEaseIn = function(t,b,c,d,a,p){
        if (t==0) return b;  
        if ((t/=d)==1) return b+c;  
        if (!p) p=d*.3;
        if (!a || a < Math.abs(c)) {
            a=c; var s=p/4;
        }
        else 
            var s = p/(2*Math.PI) * Math.asin (c/a);
        
        return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
    
}
Tween.elasticEaseOut = function (t,b,c,d,a,p){
        if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
        if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
        else var s = p/(2*Math.PI) * Math.asin (c/a);
        return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
    }
Tween.elasticEaseInOut = function (t,b,c,d,a,p){
    if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) var p=d*(.3*1.5);
    if (!a || a < Math.abs(c)) {var a=c; var s=p/4; }
    else var s = p/(2*Math.PI) * Math.asin (c/a);
    if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
    return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
}
Tween.bounceEaseOut = function(t,b,c,d){
    if ((t/=d) < (1/2.75)) {
        return c*(7.5625*t*t) + b;
    } else if (t < (2/2.75)) {
        return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
    } else if (t < (2.5/2.75)) {
        return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
    } else {
        return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
    }
}
Tween.bounceEaseIn = function(t,b,c,d){
    return c - Tween.bounceEaseOut (d-t, 0, c, d) + b;
}
Tween.bounceEaseInOut = function(t,b,c,d){
    if (t < d/2) return Tween.bounceEaseIn (t*2, 0, c, d) * .5 + b;
    else return Tween.bounceEaseOut (t*2-d, 0, c, d) * .5 + c*.5 + b;
}
Tween.strongEaseInOut = function(t,b,c,d){
    return c*(t/=d)*t*t*t*t + b;
}
Tween.regularEaseIn = function(t,b,c,d){
    return c*(t/=d)*t + b;
}
Tween.regularEaseOut = function(t,b,c,d){
    return -c *(t/=d)*(t-2) + b;
}
Tween.regularEaseInOut = function(t,b,c,d){
    if ((t/=d/2) < 1) return c/2*t*t + b;
    return -c/2 * ((--t)*(t-2) - 1) + b;
}
Tween.strongEaseIn = function(t,b,c,d){
    return c*(t/=d)*t*t*t*t + b;
}
Tween.strongEaseOut = function(t,b,c,d){
    return c*((t=t/d-1)*t*t*t*t + 1) + b;
}
Tween.strongEaseInOut = function(t,b,c,d){
    if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
    return c/2*((t-=2)*t*t*t*t + 2) + b;
}
Tween.linear = function(t,b,c,d){
    return c*(t/=d);
}