/* ************************************************************************************* *\
 * The MIT License
 * Copyright (c) 2007 Fabio Zendhi Nagao - http://zend.lojcomm.com.br
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
\* ************************************************************************************* */

var iCarousel = new Class({
	options: {
		animation: {
			type: "fadeNscroll",// fadeNscroll, scroll, fade
			direction: "left",// if type = scroll, set: top || left
			amount: 1,// if type = scroll, set the amount to scroll
			transition: Fx.Transitions.Cubic.easeInOut,
			duration: 500,
			rotate: {
				type: "manual",// auto || manual
				interval: 5000,// if type = auto, set the interval (ms)
				onMouseOver: "stop"// if type = auto, set the onmouseover behavior: stop || proceed
			}
		},

		item: {
			klass: "item",
			size: 100,
			count: 3
		},

		idPrevious: "previous",
		idNext: "next",
		idToggle: "toggle",

		onClickPrevious: Class.empty,
		onClickNext: Class.empty,
		onPrevious: Class.empty,
		onNext: Class.empty,
		onGoTo: Class.empty,
		reflection: 0,
		minItems: 1,
		
		webtrekkIdPrefix: 'widget.letzte.artikel'
	},

	initialize: function(container, options) {
		this.setOptions(options);
		this.container = $(container);
		this.aItems = $A($$('.'+ this.options.item.klass));
		
		this.options.minItems;
		this.isMouseOver = false;

		if(this.options.idPrevious != "undefined" && $(this.options.idPrevious)){
			$(this.options.idPrevious).addEvent("click", function(event) {
				new Event(event).stop();
				this._previous();
				this.fireEvent("onClickPrevious", this, 20);
			}.bind(this));// check if value is not "undefined" before start search the dom with $()
			if (this.aItems.length <= this.options.minItems) {
				$(this.options.idPrevious).setStyle('display', 'none');
			}
		}
		
		if(this.options.idNext != "undefined" && $(this.options.idNext)){
			$(this.options.idNext).addEvent("click", function(event) {
				new Event(event).stop();
				this._next();
				this.fireEvent("onClickNext", this, 20);
			}.bind(this));
			if (this.aItems.length <= this.options.minItems) {
				$(this.options.idNext).setStyle('display', 'none');
			}
		}

		if(this.options.idToggle != "undefined" && $(this.options.idToggle))
			$(this.options.idToggle).addEvent("click", function(event) {new Event(event).stop(); this._toggle()}.bind(this));

		var oAn = this.options.animation; // short hand
		switch(this.options.animation.type.toLowerCase()) {
			case "fade":
				this.aItems.each(function(item) {

					item.fx = item.effect("opacity", {duration: oAn.duration, transition: oAn.transition});
					item.setStyle("opacity", 0);
					item.addEvents({
						"mouseenter": function() {
							this.isMouseOver = true;
							if(this.options.animation.rotate.type == "auto") this.timer = $clear(this.timer);
						}.bind(this),
						"mouseleave": function() {
							this.isMouseOver = false;
							if(this.options.animation.rotate.type == "auto") this.timer = this._autoRotate.periodical(this.options.animation.rotate.interval, this);
						}.bind(this)
					});
				}.bind(this));
				this.height = this.container.getStyle("height").toInt();
				this.atScreen = 0;
				this._animate(this.atScreen);
				break;

			default:
				 if(this.aItems.length>=this.options.minItems){
					 (2).times(function() {
						this.aItems.each(function(item) {
							item.clone().injectInside(this.container);
						}.bind(this));
					}.bind(this));
				 }

				this.aItems = $A($$('.'+ this.options.item.klass));
				this.aItems.each(function(item) {
					
					if(this.options.reflection>0){

						item.reflect({ 'img': item.getElement('img'),
							'ref': this.options.reflection,
							'height': 50,
							'width': item.getElement('img').width,
							'color': 'transparent'
						}).setStyles({'width':'100%','height':'100%','background-color': 'transparent'}).inject(item);						
						
					}
					item.addEvents({
						"mouseenter": function() {
							this.isMouseOver = true;
							if(this.options.animation.rotate.type == "auto") this.timer = $clear(this.timer);
						}.bind(this),
						"mouseleave": function() {
							this.isMouseOver = false;
							if(this.options.animation.rotate.type == "auto") this.timer = this._autoRotate.periodical(this.options.animation.rotate.interval, this);
						}.bind(this)
					});
				}.bind(this));
				this.fx = new Fx.Morph(this.container, {duration: oAn.duration, transition: oAn.transition, wait: false});
				if(this.aItems.length>=this.options.minItems){
					this.atScreen = this.aItems.length / 3;
					this.container.setStyle(oAn.direction, - this.atScreen * this.options.item.size);
				}else{
					this.atScreen = this.aItems.length;
					this.container.setStyle(oAn.direction, 0);
				}
				break;
		}
		if(this.options.animation.rotate.type == "auto") this.timer = this._autoRotate.periodical(this.options.animation.rotate.interval, this);
	},

	goTo: function(n) {
		switch(this.options.animation.type.toLowerCase()) {
			case "fade":
				var lastIndex = this.atScreen;
				this.atScreen = Math.abs(n % (this.aItems.length / 3));
				this._animate(this.atScreen, lastIndex);
				break;

			default:
				this.atScreen = Math.abs(n % (this.aItems.length / 3));
				this.atScreen += this.aItems.length / 3;
				this._animate(this.atScreen);
				break;
		}

		this.fireEvent("onGoTo", this, 20);
	},

	_previous: function() {
		switch(this.options.animation.type.toLowerCase()) {
			case "fade":
				var lastIndex = this.atScreen;
				this.atScreen -= this.options.animation.amount;
				if(this.atScreen < 0) this.atScreen = (this.aItems.length - 1);
				this._animate(this.atScreen, lastIndex);
				break;

			default:
				this.atScreen -= this.options.animation.amount;
				if(this.atScreen < this.aItems.length / 3) {
					this.container.setStyle(this.options.animation.direction, - this.options.item.size * this.aItems.length * 2 / 3);
					this.atScreen = this.aItems.length * 2 / 3 - this.options.animation.amount;
				}
				this._animate(this.atScreen);
				break;
		}

		this.fireEvent("onPrevious", this, 20);
	},

	_next: function() {
		switch(this.options.animation.type.toLowerCase()) {
			case "fade":
				var lastIndex = this.atScreen;
				this.atScreen += this.options.animation.amount;
				if(this.atScreen >= this.aItems.length) this.atScreen = 0;
				this._animate(this.atScreen, lastIndex);
				break;

			default:
				this.atScreen += this.options.animation.amount;
			if(this.atScreen > this.aItems.length * 2 / 3) {
					this.container.setStyle(this.options.animation.direction, - this.options.item.size * this.aItems.length / 3);
					this.atScreen = this.aItems.length / 3 + this.options.animation.amount;
				}
				this._animate(this.atScreen);
				break;
		}

		this.fireEvent("onNext", this, 20);
	},

	_toggle: function() {
		(this.container.getStyle("height").toInt() == 0) ?
			this.container.effect("height", { duration:1000, transition: Fx.Transitions.Sine.easeInOut }).start(this.height):
			this.container.effect("height", { duration:1000, transition: Fx.Transitions.Sine.easeInOut }).start(0);
	},

	_autoRotate: function() {
		if(this.options.animation.rotate.onMouseOver == "stop" && !this.isMouseOver) this._next();
	},

	_animate: function(a, b) {
		switch(this.options.animation.type) {
			case "fade":
				if($defined(b)) {
					this.aItems[b].fx.start(0).chain(function() {
					this.aItems[a].fx.start(1);}.bind(this));
				} else {
					this.aItems[a].fx.start(1);
				}
				break;

			case "scroll":
				var that = this;
				if(that.options.animation.direction == "top") {
					that.fx.start({"top" : - a * that.options.item.size});
				} else {
					that.fx.start({"left" : - a * that.options.item.size});
				}
				break;

			case "fadeNscroll":
				var that = this;
				if(that.options.animation.direction == "top") {
					that.fx.start({"opacity":0.75}).chain(function() {
						that.fx.start({"top" : - a * that.options.item.size}).chain(function() {
							that.fx.start({"opacity": 1});
						});
					});
				} else {
					that.fx.start({"opacity":0.75}).chain(function() {
						that.fx.start({"left" : - a * that.options.item.size}).chain(function() {
							that.fx.start({"opacity": 1});
						});
					});
				}
				break;
		}
	},

});

iCarousel.implement({
	reflect: function(arg){
		//i = arg.img.clone();
		var i = arg.img.clone().set('src', arg.img.src);
		if(Browser.Engine.trident){
			i.style.filter = 'flipv progid:DXImageTransform.Microsoft.Alpha(opacity=20, style=1, finishOpacity=0, startx=0, starty=0, finishx=0, finishy='+100*arg.ref+')';
			i.setStyles({'width':'100%', 'height':'100%'});
			return new Element('div').adopt(i);
		} else {
			var can = new Element('canvas').setProperties({'width':arg.width, 'height':arg.height});
			if(can.getContext){
				var ctx = can.getContext("2d");
				ctx.save();
				ctx.translate(0,arg.height-1);
				ctx.scale(1,-1);
				ctx.drawImage(i, 0, 0, arg.width, arg.height);
				ctx.restore();
				ctx.globalCompositeOperation = "destination-out";
				ctx.fillStyle = arg.color;
				ctx.fillRect(0, arg.height*0.5, arg.width, arg.height);
				var gra = ctx.createLinearGradient(0, 0, 0, arg.height*arg.ref);					
				gra.addColorStop(1, "rgba(255, 255, 255, 1.0)");
				gra.addColorStop(0, "rgba(255, 255, 255, "+(1-arg.ref)+")");
				ctx.fillStyle = gra;
				ctx.rect(0, 0, arg.width, arg.height);
				ctx.fill();
				delete ctx, gra;
			}
			return can;
		}
	}
});

iCarousel.implement(new Events); // Implements addEvent(type, fn), fireEvent(type, [args], delay) and removeEvent(type, fn)
iCarousel.implement(new Options);// Implements setOptions(defaults, options)