/* Simple Accordion Script 
 * Requires Prototype and Script.aculo.us Libraries
 * By: Brian Crescimanno <brian.crescimanno@gmail.com>
 * http://briancrescimanno.com
 * This work is licensed under the Creative Commons Attribution-Share Alike 3.0
 * http://creativecommons.org/licenses/by-sa/3.0/us/
 */ 
 

if (typeof Effect == 'undefined')
  throw("You must have the script.aculo.us library to use this accordion");

var Accordion = Class.create({

    initialize: function(id, defaultExpandedCount, _option, _mastercontainer) {
        if(!$(id)) throw("Attempted to initalize accordion with id: "+ id + " which was not found.");
        this.accordion = $(id);
		
		if(_option == undefined || _option == null){
			this.options = {
				toggleClass: "pr_accordion_toggle",
				toggleActive: "pr_accordion_toggle_active",
				contentClass: "pr_accordion_content"
			}
		}else{
			this.options = _option;
		}
		
		this.mcontainer = _mastercontainer;
		
        this.contents = this.accordion.select('div.'+this.options.contentClass);
		this.setOriginalHeigth();
        this.isAnimating = false;
        this.maxHeight = 0;
        this.current = defaultExpandedCount ? this.contents[defaultExpandedCount-1] : this.contents[0];
        this.toExpand = null;
		
		
       	this.checkMaxHeight();
        this.initialHide();
        //this.attachInitialMaxHeight();

        var clickHandler =  this.clickHandler.bindAsEventListener(this);
        this.accordion.observe('click', clickHandler);
    },

    expand: function(el) {
        this.toExpand = el.next('div.'+this.options.contentClass);
        if(this.current != this.toExpand){
			this.toExpand.show();
            this.animate();
        }
    },	
		
	setOriginalHeigth: function(){
        for(var i=0; i<this.contents.length; i++){
            if(this.contents[i] != this.current) {
                this.contents[i].origHeigth = this.contents[i].getHeight();
            }
        }
    },

    checkMaxHeight: function() {
        for(var i=0; i<this.contents.length; i++) {
            if(this.contents[i].getHeight() > this.maxHeight) {
                this.maxHeight = this.contents[i].getHeight();
            }
        }
    },

    attachInitialMaxHeight: function() {
		this.current.previous('div.'+this.options.toggleClass).addClassName(this.options.toggleActive);
        if(this.current.getHeight() != this.maxHeight) this.current.setStyle({height: this.maxHeight+"px"});
    },

   clickHandler: function(e) {
		if (!this.isAnimating){
			var el = e.element();
			while (el && el.hasClassName && !el.hasClassName(this.options.toggleClass)){
				el=el.parentNode;
			}
			if(el && el.hasClassName && el.hasClassName(this.options.toggleClass)) {
				this.expand(el);
			}
		}
	},

    initialHide: function(){
        for(var i=0; i<this.contents.length; i++){
            if(this.contents[i] != this.current) {
                this.contents[i].hide();
                this.contents[i].setStyle({height: 0});
            }
        }
    },


    animate: function() {
        var effects = new Array();
        var options = {
            sync: true,
            scaleFrom: 0,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleMode: {
                originalHeight: this.toExpand.origHeigth ,
                originalWidth: this.accordion.getWidth()
            },
            scaleX: false,
            scaleY: true
        };

        effects.push(new Effect.Scale(this.toExpand, 100, options));

        options = {
            sync: true,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleX: false,
            scaleY: true
        };

        effects.push(new Effect.Scale(this.current, 0, options));

        var myDuration = 0.75;

        new Effect.Parallel(effects, {
            duration: myDuration,
            fps: 35,
            queue: {
                position: 'end',
                scope: 'accordion'
            },
            beforeStart: function() {
                this.isAnimating = true;
                this.current.previous('div.'+this.options.toggleClass).removeClassName(this.options.toggleActive);
                this.toExpand.previous('div.'+this.options.toggleClass).addClassName(this.options.toggleActive);
				if(this.toExpand.origHeigth > this.current.origHeigth){
					var HNE = (this.contents.length*50);
					var HH  = this.toExpand.origHeigth+HNE+this.mcontainer.hederH +30;
					this.mcontainer.setStyle({height:HH+"px"});
				}
            }.bind(this),
            afterFinish: function() {
                this.current.hide();
                this.toExpand.setStyle({ height: this.toExpand.origHeigth+"px" });
                this.current = this.toExpand;
                this.isAnimating = false;
				var HNE = (this.contents.length*50);
				var HH  = this.toExpand.origHeigth+HNE+this.mcontainer.hederH +30;
				this.mcontainer.setStyle({height:HH+"px"});
            }.bind(this)
        });
    }

});