/*http://creativepony.com/journal/scripts/sliding-tabs/ v1.8*/
var SlidingTabs = new Class({
	Implements: [Options,Events],
	options: {
		btns: null,
		startingSlide: false,
		activeButtonClass: 'active',
		activationEvent: 'click',
		wrap: true,
		slideEffect: {duration: 400},
		animateHeight: true,
		rightOversized: 0
	},
	current: null,
	buttons: false,
	outerSlidesBox: null,
	innerSlidesBox: null,
	panes: null,
	fx: null,
	heightFx: null,
	initialize: function(buttonContainer, slideContainer, options) {
		if (buttonContainer) { 
			this.buttons = $(buttonContainer).getChildren(); 
		}
		this.outerSlidesBox = $(slideContainer);
		this.innerSlidesBox = this.outerSlidesBox.getFirst();
		this.panes = this.innerSlidesBox.getChildren();
		this.setOptions(options);
		this.fx = new Fx.Scroll(this.outerSlidesBox, this.options.slideEffect);
		this.heightFx = this.outerSlidesBox.set('height', this.options.slideEffect);
		this.current = this.options.startingSlide ? this.panes.indexOf($(this.options.startingSlide)) : 0;
		if (this.buttons) { 
			this.buttons[this.current].addClass(this.options.activeButtonClass); 
		}
		this.outerSlidesBox.setStyle('overflow', 'hidden');
		this.panes.each(function(pane, index) {
				pane.setStyles({
					'float': 'left',
					'overflow': 'hidden'
				});
			}.bind(this));
		this.innerSlidesBox.setStyle('float', 'left');
		if (this.options.startingSlide) this.fx.toElement(this.options.startingSlide);
		if (this.buttons) this.buttons.each( function(button) {
				button.addEvent(this.options.activationEvent, this.buttonEventHandler.bindWithEvent(this, button));
			}.bind(this));
		if (this.options.animateHeight)
		this.heightFx.set(this.panes[this.current].offsetHeight);
		this.recalcWidths();
		this.recalcHeight(); 
	},
	changeTo: function(element, animate) {
		if ($type(element) == 'number') element = this.panes[element - 1];
		if (!$defined(animate)) animate = true;
		var event = { cancel: false, target: $(element), animateChange: animate };
		
		this.fireEvent('change', event);
		if (event.cancel == true) { return; };
		if (this.buttons) { this.buttons[this.current].removeClass(this.options.activeButtonClass); };
		this.current = this.panes.indexOf($(event.target));
		var oldHeight = this.outerSlidesBox.getStyle('height');
		this.panes[this.current].setStyle('display','block');
		var oldHeight = this.outerSlidesBox.setStyle('height', oldHeight);
		if (this.buttons) { this.buttons[this.current].addClass(this.options.activeButtonClass); };
		this.fx.cancel();
		if (!Browser.Engine.trident && event.animateChange) {
			this.fx.toElement(event.target);
		} else {
			this.outerSlidesBox.scrollTo(this.current * this.outerSlidesBox.offsetWidth.toInt(), 0);
		}
		if (this.options.animateHeight)
		this.heightFx.tween('height',this.panes[this.current].offsetHeight);
	},
	buttonEventHandler: function(event, button) {
		if (event.target == this.buttons[this.current]) return;
		this.changeTo(this.panes[this.buttons.indexOf($(button))]);
	},
	next: function() {
		var next = this.current + 1;
		if (next == this.panes.length) {
			if (this.options.wrap == true) { next = 0 } else { return }
		}
		this.changeTo(this.panes[next]);
		this.activate(); 
	},
	previous: function() {
		var prev = this.current - 1
		if (prev < 0) {
			if (this.options.wrap == true) { prev = this.panes.length - 1 } else { return }
		}
		this.changeTo(this.panes[prev]);
		this.activate(); 
	},
	recalcWidths: function() {
		this.panes.each(function(pane, index) {
			pane.setStyle('width', this.outerSlidesBox.offsetWidth.toInt() - this.options.rightOversized + 'px');
		}.bind(this));
		this.innerSlidesBox.setStyle('width', (this.outerSlidesBox.offsetWidth.toInt() * this.panes.length) + 'px');
		if (this.current > 0) {
			this.fx.cancel();
			this.outerSlidesBox.scrollTo(this.current * this.outerSlidesBox.offsetWidth.toInt(), 0);
		}
	},
	recalcHeight: function() {
		this.heightFx.tween('height',this.panes[this.current].offsetHeight);
	},
	activate: function() {
		if(this.options.btns!=null) {
			if(this.current==0) {
				utils.deactivate(this.options.btns); 
			} else {
				if(this.options.btns) {
					utils.activate(this.options.btns[this.current-1],this.options.btns); 
				}
			}
		}
	}
});