/**
 * Accordion Effect for Script.aculo.us
 * Created by Lucas van Dijk
 * http://www.return1.net
 *
 * Copyright 2007 by Lucas van Dijk
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 */
 
var Accordion = Class.create();
 
Accordion.prototype =
{
  initialize: function(handles, bodys, options)
  {
    this.options = this._set_options(options);   
    this.headers = $$(handles);
    this.bodys = $$(bodys);
     
    if(this.bodys.length != this.headers.length)
    {
      throw Error('Number of headers/bodys does not match!');
    }
     
    for(var i = 0; i < this.headers.length; i++)
    {    
      Event.observe(this.headers[i], this.options.event_trigger, this.show.bind(this, i));       
      this.headers[i].style.cursor = "pointer";
      this.bodys[i].style.display = "none";
    }
     
    //this.bodys[this.options.default_open].id = "visible";
    this.show(this.options.default_open, true);
  },
 
  show: function(index, force)
  {    
    if ((index >= this.length) || (index < 0))
    {
      throw Error('Index out of range');
    }
    this.options.OnStart(index, this.bodys[index]);

    // Hide the existing visible(s)
    effects = []
    for(var i = 0; i < this.bodys.length; i++)
    {
      if(this.bodys[i].style.display != 'none' && i != index)
      {
        effects.push(new Effect.Fade(this.bodys[i]))
        effects.push(new Effect.BlindUp(this.bodys[i]));
      }
    }
     
    effects.push(new Effect.BlindDown(this.bodys[index]));
    effects.push(new Effect.Appear(this.bodys[index]));
    new Effect.Parallel(effects, {duration: this.options.duration});
    this.bodys[index].addClassName = "accordion_visible";
        
    // if (this.bodys[index].hasClassName("accordion_visible"))
    // {                
    //   if (typeof force == "boolean")
    //   {            
    //     this.options.OnStart(index, this.bodys[index]);
    //              
    //     // Force display the visible object      
    //     for(var i = 0; i < this.bodys.length; i++)
    //     {
    //       if(this.bodys[i].style.display != 'none' && i != index)
    //       {
    //         new Effect.BlindUp(this.bodys[i]);
    //       }
    //     }
    //      
    //     new Effect.BlindDown(this.bodys[index]);
    //   }
    // }
    // else
    // {    
    //   this.options.OnStart(index, this.bodys[index]);      
    //   // Normal change
    //   new Effect.Parallel(
    //     [
    //       new Effect.Fade($('visible')),       
    //       new Effect.BlindUp($('visible')),
    //       new Effect.BlindDown(this.bodys[index]),
    //       new Effect.Appear(this.bodys[index])
    //     ], {duration: this.options.duration}
    //   );
    //   this.bodys[index].addClassName = "accordion_visible";
    // }
    //  
    
    this.options.OnFinish(index, this.bodys[index]);
  },
   
  _default_options:
  {
    duration: 0.4,
    event_trigger: 'click',
    OnStart: function() { },
    OnFinish: function() { },
    default_open: 0
  },
   
  _set_options: function(options)
  {
    if(typeof options != "undefined")
    {    
      var result = [];
      for(option in this._default_options)
      {
        if(typeof options[option] == "undefined")
        {
          result[option] = this._default_options[option];
        }
        else
        {
          result[option] = options[option];
        }
      }
     
      return result;
    }
    else
    {
      return this._default_options;
    }
  }    
};
 
Effect.Accordion = Accordion;