/*
  MIT-style license ...
  Author: Mats Lindblad <mats[dot]lindblad[at]gmail[dot]com>
  Inspiration: accordion.js found at script.aculo.us
*/
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), new Effect.BlindDown(next.togglee)], {duration: 0.4});
	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:   'ok'
	};
	Object.extend(this.options, options || {});
  },
  setCurrent: function(){
	if (this.options.defaultTogglee != null && $(this.options.defaultTogglee)) {
	  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();
	}
  }
};

Event.observe(document, "dom:loaded", function(){
	if($('accordion'))
		new Accordion("accordion", {defaultTogglee:'open'});
});