/*
---
script: Fx.Tween.CSS3.js
license: MIT-style license.
description: Same behavior like Fx.Tween but tries to use native CSS3 transition if possible.
copyright: Copyright (c) 2010, Dipl.-Ing. (FH) André Fiedler <kontakt at visualdrugs dot net>, based on code by eskimoblood (mootools users group)
authors: [André Fiedler, eskimoblood]

requires: [Core/Class.Extras, Core/Element.Event, Core/Element.Style, Core/Fx.Tween]

provides: [Fx.Tween.CSS3]
...
*/

Element.NativeEvents.transitionend = 2;
Element.NativeEvents.webkitTransitionEnd = 2;
Element.NativeEvents.oTransitionEnd = 2;

Element.Events.set('transitionend', {
	base: Browser.Engine.webkit ? 'webkitTransitionEnd' : (Browser.Engine.presto ? 'oTransitionEnd' : 'transitionend')
});

Event.implement({
	
	getPropertyName: function(){
		return this.event.propertyName;
	},

	getElapsedTime: function(nativeTime){
		return nativeTime ? this.event.elapsedTime : (this.event.elapsedTime * 1000).toInt();
	}

});

Element.implement ({
	
	supportStyle: function(style){
		var value = this.style[style];
		return !!(value || value == '');
	},

	supportVendorStyle: function(style){
		var prefixedStyle = null;
		return this.supportStyle(style) ? style : ['webkit', 'Moz', 'o'].some(function(prefix){
			prefixedStyle = prefix + style.capitalize();
			return this.supportStyle(prefixedStyle);
		}, this) ? prefixedStyle : null;
	}

});

Fx.Tween.CSS3 = new Class({
	
	Extends: Fx.Tween,
	
	transitionTimings: {
		'linear'		: '0,0,1,1',
		'expo:in'		: '0.71,0.01,0.83,0',
		'expo:out'		: '0.14,1,0.32,0.99',
		'expo:in:out'	: '0.85,0,0.15,1',
		'circ:in'		: '0.34,0,0.96,0.23',
		'circ:out'		: '0,0.5,0.37,0.98',
		'circ:in:out'	: '0.88,0.1,0.12,0.9',
		'sine:in'		: '0.22,0.04,0.36,0',
		'sine:out'		: '0.04,0,0.5,1',
		'sine:in:out'	: '0.37,0.01,0.63,1',
		'quad:in'		: '0.14,0.01,0.49,0',
		'quad:out'		: '0.01,0,0.43,1',
		'quad:in:out'	: '0.47,0.04,0.53,0.96',
		'cubic:in'		: '0.35,0,0.65,0',
		'cubic:out'		: '0.09,0.25,0.24,1',
		'cubic:in:out'	: '0.66,0,0.34,1',
		'quart:in'		: '0.69,0,0.76,0.17',
		'quart:out'		: '0.26,0.96,0.44,1',
		'quart:in:out'	: '0.76,0,0.24,1',
		'quint:in'		: '0.64,0,0.78,0',
		'quint:out'		: '0.22,1,0.35,1',
		'quint:in:out'	: '0.9,0,0.1,1'
	},
	
	initialize: function(element, options){
		options.transition = options.transition || 'sine:in:out';
		this.parent(element, options);
		if (typeof this.options.transition != 'string') alert('Only short notated transitions (like \'sine:in\') are supported by Fx.Tween.CSS3');
		this.options.transition = this.options.transition.toLowerCase();
		this.transition = this.element.supportVendorStyle('transition');
		this.css3Supported = !!this.transition && !!this.transitionTimings[this.options.transition];
	},

	check: function(){
		if (!this.boundComplete) return true;
		return this.parent();
	},

	start: function(property, from, to){
		if (this.css3Supported){
			if (!this.check(property, from, to)) return this;
			var args = Array.flatten(arguments);
			this.property = this.options.property || args.shift();
			var parsed = this.prepare(this.element, this.property, args);
			this.from = parsed.from;
			this.to = parsed.to;
			this.boundComplete = function(event){
				if (event.getPropertyName() == this.property /* && event.getElapsedTime() == this.options.duration */ ){
					this.element.removeEvent('transitionend', this.boundComplete);
					this.boundComplete = null;
					this.onComplete();
				}
			}.bind(this);
			this.element.addEvent('transitionend', this.boundComplete);
			var trans = function(){
				this.element.setStyle(this.transition, this.property + ' ' + this.options.duration + 'ms cubic-bezier(' + this.transitionTimings[this.options.transition] + ')');
				this.element.setStyle(this.property, this.to[0].value);
			}.bind(this);
			if (args[1]){
				this.element.setStyle(this.transition, 'none');
				this.element.setStyle(this.property, this.from[0].value);
				trans.delay(0.1);
			} else 
				trans();
			this.onStart();
			return this;
		}
		return this.parent(property, from, to);
	},

	cancel: function(){
		if (this.css3Supported){
			this.element.setStyle(this.transition, 'none');
			this.element.removeEvent('transitionend', this.boundComplete);
			this.boundComplete = null;
		}
		this.parent();
		return this;
	}

});