/**
* @author Bruno Bornsztein <bruno@missingmethod.com>
* @copyright 2007 Curbly LLC
* @package Glider
* @license MIT
* @url http://www.missingmethod.com/projects/glider/
* @version 0.0.3
* @dependencies prototype.js 1.5.1+, effects.js
*/

/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */

Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
	initialize: function(wrapper, options){
		this.scrolling  = false;
		this.wrapper    = $(wrapper);
		this.scroller   = this.wrapper.down('div.scroller');
		this.sections   = this.wrapper.getElementsBySelector('div.section');
		this.options    = Object.extend({ duration: 1.0, frequency: 3 }, options || {});

		this.sections.each( function(section, index) {
			section._index = index;
		});

		this.events = {
			click: this.click.bind(this)
		};

		this.addObservers();
		if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration });  // initialSection should be the id of the section you want to show up on load
		if(this.options.autoGlide) this.start();
	},

	addObservers: function() {
		var controls = this.wrapper.getElementsBySelector('div.controls a');
		controls.invoke('observe', 'click', this.events.click);
	},

	click: function(event) {
		this.stop();
		var element = Event.findElement(event, 'a');
		if (this.scrolling) this.scrolling.cancel();

		this.moveTo(element.href.split("#")[1], this.scroller, { duration:this.options.duration });
		Event.stop(event);
	},

	moveTo: function(element, container, options){
		this.current = $(element);

		for(i in this.sections){
			if ($(this.sections[i].id)) $(this.sections[i].id).hide();
		}

/*		for (i=1; i < $('text-prod').descendants().length + 1; i++){
			if ( $('text' + i) ) $('text' + i).hide();
		}
		var idCapa = this.current.id;
		pos = parseInt(idCapa.substr(idCapa.length-1));
		$('text' + pos).show();
*/


		Position.prepare();
		var containerOffset = Position.cumulativeOffset(container),
		elementOffset = Position.cumulativeOffset($(element));

		if($(element).id.include('section')){
			var a = $('controlsIn').getElementsByTagName('a');
			for (i = 0; i < a.length; i++){
				pos = i + 1;
				if (a[i].href.split("#")[1] != $(element).id){
					a[i].removeClassName('active');
					if ($('text' + pos)) $('text' + pos).hide();
				}else{
					a[i].addClassName('active');
					if ($('text' + pos)) $('text' +  pos).show();
				}
			}
		}

		this.scrolling 	= new Effect.SmoothScroll(container,
		{duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
		new Effect.Appear(this.current.id,{duration: 0.3,queue: 'end'});

		return false;
	},

	next: function(){
		if (this.current) {
			var currentIndex = this.current._index;
			var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;
		} else var nextIndex = 1;

		this.moveTo(this.sections[nextIndex], this.scroller, {
			duration: this.options.duration
		});
	},

	previous: function(){
		if (this.current) {
			var currentIndex = this.current._index;
			var prevIndex = (currentIndex == 0) ? this.sections.length - 1 :
			currentIndex - 1;
		} else var prevIndex = this.sections.length - 1;

		this.moveTo(this.sections[prevIndex], this.scroller, {
			duration: this.options.duration
		});
	},

	stop: function()
	{
		clearTimeout(this.timer);
	},

	start: function()
	{
		this.periodicallyUpdate();
	},

	periodicallyUpdate: function()
	{
		if (this.timer != null) {
			clearTimeout(this.timer);
			this.next();
		}
		this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
	}

});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
	initialize: function(element) {
		this.element = $(element);
		var options = Object.extend({
			x:    0,
			y:    0,
			mode: 'absolute'
		} , arguments[1] || {}  );
		this.start(options);
	},
	setup: function() {
		if (this.options.continuous && !this.element._ext ) {
			this.element.cleanWhitespace();
			this.element._ext=true;
			this.element.appendChild(this.element.firstChild);
		}

		this.originalLeft=this.element.scrollLeft;
		this.originalTop=this.element.scrollTop;

		if(this.options.mode == 'absolute') {
			this.options.x -= this.originalLeft;
			this.options.y -= this.originalTop;
		}
	},
	update: function(position) {
		this.element.scrollLeft = this.options.x * position + this.originalLeft;
		this.element.scrollTop  = this.options.y * position + this.originalTop;
	}
});