/* 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) {
        if(!$(id)) {return;}
        this.accordion = $(id);
        this.options = {
            toggleClass: "accordion-toggle",
            toggleActive: "accordion-toggle-active",
            contentClass: "accordion-content"
        }
        this.contents = this.accordion.select('div.'+this.options.contentClass);
		this.toggles = this.accordion.select('div.'+this.options.toggleClass); 
		this.initialHeights = new Array();
		this.checkInitialHeights();
        this.isAnimating = false;
        this.maxHeight = 0;
        this.current = defaultExpandedCount ? this.contents[defaultExpandedCount-1] : this.contents[0];
        this.toExpand = null;
		
        this.checkMaxHeight();
        this.initialHide();

        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(el);
        }
    },

	checkInitialHeights: function() {
        for(var i=0; i<this.contents.length; i++) {
			this.initialHeights[i] = i+":"+ this.contents[i].getHeight();
        }
    },
	
	getNewHeight: function(index) {
		for(var i=0; i<this.initialHeights.length; i++) {
			var initIndex = this.initialHeights[i].substring(0, this.initialHeights[i].indexOf(":"));
			if(initIndex.indexOf(index) != -1) {
				return this.initialHeights[i].substring(this.initialHeights[i].indexOf(":")+1, this.initialHeights[i].length);
			}
        }
    },
	
	clickHandler: function(e) {
        var el = e.element();
        if(el.hasClassName(this.options.toggleClass) && !this.isAnimating) {
            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});
            }
        }
    },
	
	checkMaxHeight: function() {
		this.maxHeight =  0;
		this.maxHeight = this.maxHeight + $("accordion").firstDescendant().getHeight();
		var maxContentHeight = 0; 
		for(var i=0; i<this.contents.length; i++) {
			if(this.contents[i].getHeight() > maxContentHeight) {
				maxContentHeight = this.contents[i].firstDescendant().getHeight();
			}
        }
		this.maxHeight = this.maxHeight + maxContentHeight;	
		
		for(var i=0; i<this.toggles.length; i++) {
			this.maxHeight = this.maxHeight + this.toggles[i].getHeight();
        }
		$("accordion").style.height = this.maxHeight+"px";
    },

    animate: function(el) {
		var effects = new Array();
        var options = {
			
            sync: true,
            scaleFrom: 0,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleMode: { 
				originalHeight: this.getNewHeight(el.id.substring(6, el.id.length)),
                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 = 0.5;

        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);
            }.bind(this),
            afterFinish: function() {
				this.newHeight = this.getNewHeight(this.toExpand.id.substring(7, this.toExpand.id.length));
				this.current.hide();
                this.toExpand.setStyle({height: this.newHeight+"px"});
                this.current = this.toExpand;
                this.isAnimating = false;
            }.bind(this)
        });
    }

});

document.observe("dom:loaded", function(){
	//accordion = new Accordion("accordion", $$('.accordion-content').length);
	var accordion = new Accordion("accordion", 1);
})