var PhotoStack = new Class({
	
	Implements: [Options],
	
	options: {
		images: "img", // Which images inside the wrapper should we grab?
		rotationMax: 6, // Rotation max (both positive and negative)
		translationChange: 100, // Positive and negative,
		translationPxChange: 3, // Only positive
		scaleMax: 1.1, // Only positive, obviously,
		duration: 100 // Animation duration
	},
	
	initialize: function(wrapper, options) {
		this.setOptions(options);
		
		// Sort out elements
		this.wrapper = wrapper;
		this.images = [];
		
		// Add images
		wrapper.getElements(this.options.images).each(this.addImage, this);
		this.initialAdded = true;
		this.calculateSteps();
		
		// Add events
		this.addEvents();
		
		// This string will hold the proper calculation
		this.calculatedStyle = "";
	},
	
	calculateSteps: function() {
		// Get the images and calculation transformation values based on those images
		var images = this.images,
			numImages = images.length,
			halfImages = (numImages / 2),
			options = this.options;
		
		// Calculate the fx properties
		this.rotationIncrement = (options.rotationMax * 2 / (numImages - 1));
		this.rotationStart = options.rotationMax * -1;
		this.translationIncrement = options.translationChange / (numImages - 1);
		this.translationStart = options.translationChange * -1;
		this.translationPx = options.translationPxChange * -1;
	},
	
	addImage: function(image) {
		this.images.push(image);
		if(this.initialAdded) this.calculateSteps();
	},
	
	createFx: function(image) {
		if(image.retrieve("photostack")) return;
		
		// Create an instance of select
		var fx = new Fx({ duration: this.options.duration });
		fx.set = function(value) {
			
			// Calculate image settings specific to this instance
			var index = image.retrieve("photostack-index"),
				targetRotation = (this.rotationStart + (index * this.rotationIncrement)), // deg
				targetTranslation = (this.translationStart + (index * this.translationIncrement)), // px
				targetTranslationPx = this.translationPx; //px
			
			// Create the style string for this spot in the animation
			var style = "rotate(" + (targetRotation * value) + "deg) translate(" + (targetTranslation * value) + "px, " + (targetTranslationPx * value) + "px) scale(" + (1 + (value * (this.options.scaleMax - 1))) + ")";
			
			// Update those styles accordingly
			image.setStyles({
				"-webkit-transform": style,
				"-moz-transform": style,
				"-o-transform": style,
				"-ms-transform": style,
				transform: style
			});
		}.bind(this);
		
		// Store the fx object
		image.store("photostack", fx);
	},
	
	addEvents: function() {
		var images = this.images, wrapper = this.wrapper;
		
		// Create an event to lazyload photodeck fx creation
		var lazyFxEvent = function() {
			images.each(this.createFx, this);
			wrapper.removeEvent("mouseenter", lazyFxEvent);
			wrapper.removeEvent("focus", lazyFxEvent);
		}.bind(this);
		
		// Add the proper events
		wrapper.addEvent("mouseenter", lazyFxEvent);
		wrapper.addEvent("focus", lazyFxEvent);
		
		// Create basic mouseenter/leave events
		var todo = function(images, to, from) {
			return function() {
				images.each(function(image, index) {
					image.store("photostack-index", index);
					image.retrieve("photostack").start(to, from);
				});
			};
		};
		
		// Add the mouseenter and leave events to the album wrapper
		wrapper.addEvents({
			mouseenter: todo(images, 0, 1),
			focus: todo(images, 0, 1),
			mouseleave: todo(images, 1, 0),
			blur: todo(images, 1, 0)
		});
	}
});