/*
Accordion is freely distributable under the terms of an MIT-style license.
Inspiration: accordion.js found at script.aculo.us, find it yourself!
http://people.su.se/~matlin/drop_down/js/accordion.js
*/
var Accordion = Class.create();
Accordion.prototype = {
	initialize: function(container, options){
		this.container = $(container);
		this.setOptions(options);
		this.togglers = this.container.select(this.options.toggler);
		this.togglees = this.container.select(this.options.togglee);
		this.togglees.invoke("hide");
		this.togglers.each(function(t, idx){
				t.observe('click', this.show.bindAsEventListener(this, idx));
		}.bind(this));
		this.setCurrent();
	},
	show: function(event, index) {
		var element = Event.element(event);
		if (this.open.toggler == element) return;
		var current = this.open;
		var next = {toggler: element, togglee: this.togglees[index]};
		new Effect.Parallel([
			new Effect.BlindUp(current.togglee, {transition:Effect.Transitions.exponential, fps:90}),
			new Effect.BlindDown(next.togglee,  {transition:Effect.Transitions.exponential, fps:90})
			], {duration: 0.5});
		current.toggler.removeClassName(this.options.activeClassName);
		next.toggler.addClassName(this.options.activeClassName);
		this.open = next;
	},
	setOptions: function(options){
		this.options = {
			toggler:          '.toggler', // className of the element you click
			togglee:          '.togglee', // className of the element you toggle
			activeClassName:  'visible', // className to put on the open elements
			defaultTogglee:   null
		};
		Object.extend(this.options, options || {});
	},
	setCurrent: function(){
		if (this.options.defaultTogglee != null) {
			this.togglees.each(function(t, idx){
					if (t.id == this.options.defaultTogglee) {
						t.show();
						this.open = {toggler: this.togglers[idx], togglee: this.togglees[idx]};
						this.togglers[idx].addClassName(this.options.activeClassName);
						return;
					}
			}.bind(this));
		}
		else {
			this.open = {toggler: this.togglers.first(), togglee: this.togglees.first()};
			this.togglers.first().addClassName(this.options.activeClassName);
			this.togglees.first().show();
		}
	}
};

/*
This is an extension to Effects, found at http://wiki.script.aculo.us/scriptaculous/show/EffectsTreasureChest
I thought it could be an aternative to using Effect.Parallel
*/
if (typeof Effect == "object") {
	Effect.PhaseIn = function(element) {
		element = $(element);
		new Effect.Parallel([
			new Effect.BlindDown(element, arguments[1] || {}),
			new Effect.Appear(element, arguments[2] || arguments[1] || {})
			]);
	}
	Effect.PhaseOut = function(element) {
		element = $(element);
		new Effect.Parallel([
			new Effect.Fade(element, arguments[1] || {}),
			new Effect.BlindUp(element, arguments[2] || arguments[1] || {})
			]);
	}
	Effect.Phase = function(element) {
		element = $(element);
		if (element.style.display == 'none')
			new Effect.PhaseIn(element, arguments[1] || {}, arguments[2] || arguments[1] || {});
		else
			new Effect.PhaseOut(element, arguments[1] || {}, arguments[2] || arguments[1] || {});
	}
	Effect.Transitions.exponential = function(pos) {
		return 1-Math.pow(1-pos,2);
	}
}