/*
	MooRevolver v0.2 - A simple Image revolver control built upon mooTools
	by Med - MIT-style license.
	
	Code adapted from jMaki (https://ajax.dev.java.net/samples/)

*/

var MooRevolver = new Class({
	initialize: function(element, options){
		this.setOptions({
			"pad":150,
			"border":0,
			"yRadius":10,
			"arrowLeft":null,
			"arrowRight":null,
			"fxDuration": 800,
			"fxTransition": Fx.Transitions.Sine.easeInOut,
			"fade":false
		}, options);
				
		if($(element)){
		
			if($(this.options.arrowLeft)) {
				$(this.options.arrowLeft).addEvent("click", (function(e){
					new Event(e).stop();
					this.getPrevious();
				}).bind(this));
			}
				
			if($(this.options.arrowRight)) {
				$(this.options.arrowRight).addEvent("click", (function(e){
					new Event(e).stop();
					this.getNext();
				}).bind(this));
			}
			
			this.processing = false;
			this.containerSize = $(element).getSize();
			this.xRadius = (this.containerSize.size.x / 2) - this.options.pad;
			this.yRadius = this.options.yRadius;
			this.centerX = (this.containerSize.size.x / 2);
			this.centerY = 35;
						
			this.items = $(element).getChildren();
			this.totalItems = this.items.length;
			
			this.points = [];
			this.positions = [];
			this.sizes = [];
			this.zIndexes = [];
			this.opacities = [];
						
			for(var i = 0; i < this.totalItems; i++){
				this.points.push(i * (360 / this.totalItems));
				var pt = this.getElipticalPoint(this.points[i]);
				
				this.items[i].setStyles({
					"left": pt.x,
					"top": pt.y
				});
				
				this.processItem(i, this.points[i]);
			}
			
			this.reposition();
			
		} else {
			return;
		}
	},
	
	getNext: function(){
		if (!this.processing) {
			this.processing = true;
			this.rotate(true);
		}
	},
	
	getPrevious: function(){
		if (!this.processing) {
			this.processing = true;
			this.rotate(false);
		}
	},
	
	rotate: function(forward){
		if(!this.processing) return;

		if(forward){
			this.items.push(this.items.shift());
		} else {
			this.items.unshift(this.items.pop());
		}
		
		var fxArray = [];
		
		for(var i = 0; i < this.totalItems; i++){
			var myEffects = this.items[i].effects({"duration": this.options.fxDuration, "transition": this.options.fxTransition});
			fxArray.push(myEffects);
			if(this.options.fade) {
				myEffects.start({"opacity": this.opacities[i], "top": this.positions[i].y, "left": this.positions[i].x, "width": this.sizes[i].x, "height": this.sizes[i].y});
			} else {
				myEffects.start({"top": this.positions[i].y, "left": this.positions[i].x, "width": this.sizes[i].x, "height": this.sizes[i].y});
			}
			this.items[i].setStyle("z-index", this.zIndexes[i]);
		}
		
		var g = new Group(null);
		g.initialize.apply(g, fxArray);
		g.addEvent("onComplete", (function(){ this.processing = false; }).bind(this));
	},
	
	reposition: function() {
		for (var _l = 0; _l < this.totalItems; _l++) {		
			var pt = this.getElipticalPoint(this.points[_l]);
			this.positions.push({x: pt.x - ((this.items[_l].getSize().size.x + this.options.border) / 2), y: pt.y});
			
			this.items[_l].setStyles({
				"left": this.positions[_l].x,
				"top": this.positions[_l].y
			});
		}
	},
	
	getElipticalPoint: function(_d) {
		var rad = _d * (Math.PI / 180);
		var _x = this.centerX + this.xRadius * Math.sin(rad);
		var _y = this.centerY + this.yRadius * Math.cos(rad);
		return {x : _x, y : _y};
	},
	
	processItem: function(_i, deg) {
		var size = 1;      
		
		if (deg >= 0 && deg < 180) {
			size = (180 - deg) / 180;
		} else if (deg >= 180 && deg <= 360) {
			size = (deg - 180) / 180;
		}
		this.scaleItem(_i, size);
		this.items[_i].setStyle("z-index", (size * 100).round());
		this.zIndexes.push((size * 100).round());
	},
	
	scaleItem: function(_i, percentage) {
		if(percentage == 0) percentage = 0.1;
		
		var _x = ((this.items[_i].getSize().size.x + this.options.border) * percentage);
		var _y = ((this.items[_i].getSize().size.y + this.options.border) * percentage);
		
		this.sizes.push({x: _x, y: _y});
		this.opacities.push(percentage);
	
		this.items[_i].setStyles({
			"width": _x,
			"height": _y,
			"opacity": this.options.fade ? percentage : 1
		});
	}
});

MooRevolver.implement(new Options);