/**
*
*  @name Moobox.js
*  @version 1.0
*  @author Beau Bishop <beau[at]webteks[dot]com>
*
* Original code based on "MOOdalBox", by Razvan Brates:        
* http://www.e-magine.ro/moodalbox
*
*  @revision $Id: $  
*/
var _ERROR_MESSAGE = "<br /><br /><p>Oops.. there was a problem with your request.</p>" +
					 "<p>Please try again.</p>" +
					 "<p><em>Click anywhere to close.</em></p>";
var Moobox = {
	init: function (options) {
		// setup options
		this.options = Object.extend({
			resizeDuration: 	400,
			initialWidth: 		250,	
			initialHeight: 		250,
			contentsWidth: 		640,
			contentsHeight: 	480,
			defContentsWidth: 	640,
			defContentsHeight: 	480,
			animateCaption: 	true,
			evalScripts: 		false,
			evalResponse: 		false
			
		}, options || {});
		
		// collect moobox anchors
		this.anchors = [];
		$A($$('a')).each(function(el){
			// check for links that have a rel attribute starting with "moobox"
			if(el.rel && el.href && el.rel.test('^moobox', 'i')) {
				el.onclick = this.click.pass(el, this);
				this.anchors.push(el);
			}
		}, this);
		
		// event listeners
		this.eventKeyDown = this.keyboardListener.bindWithEvent(this);
		this.eventPosition = this.position.bind(this);
				
		// init HTML elements
		this.overlay = new Element('div').setProperty('id', 'mb_overlay').injectInside(document.body);
		this.center = new Element('div').setProperty('id', 'mb_center').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body);
		this.contents = new Element('div').setProperty('id', 'mb_contents').injectInside(this.center);
		this.bottom = new Element('div').setProperty('id', 'mb_bottom').setStyle('display', 'none').injectInside(document.body);
		this.closelink = new Element('a').setProperties({id: 'mb_close_link', href: '#'}).injectInside(this.bottom);
		this.caption = new Element('div').setProperty('id', 'mb_caption').injectInside(this.bottom);
		new Element('div').setStyle('clear', 'both').injectInside(this.bottom);
		
		this.error = new Element('div').setProperty('id', 'mb_error').setHTML(_ERROR_MESSAGE);
		
		// attach close event to the overlay and closeLink
		this.closelink.onclick = this.overlay.onclick = this.close.bind(this);
		
		var nextEffect = this.nextEffect.bind(this);

		this.fx = {
			overlay: 	this.overlay.effect('opacity', { duration: 500 }).hide(),
			resize: 	this.center.effects({ duration: this.options.resizeDuration, onComplete: nextEffect }),
			contents: 	this.contents.effect('opacity', { duration: 500, onComplete: nextEffect }),
			bottom: 	this.bottom.effects({ duration: 400, onComplete: nextEffect })
		};

		this.ajaxRequest = Class.empty;
	},

	click: function(link) {
		return this.open (link.href, link.title, link.rel);
	},

	open: function(sLinkHref, sLinkTitle, sLinkRel) {
		this.href = sLinkHref;
		this.title = sLinkTitle;
		this.rel = sLinkRel;
		this.position();
		this.setup(true);
		this.top = Window.getScrollTop() + (Window.getHeight() / 15);
		this.center.setStyles({top: this.top+'px', display: ''});
		this.fx.overlay.custom(0.8);
		return this.loadContents(sLinkHref);
	},
	
	position: function() {
		this.overlay.setStyles({top: Window.getScrollTop()+'px', height: Window.getHeight()+'px'});
	},

	setup: function(open) {
		var elements = $A($$('object'));
		elements.extend($$(window.ActiveXObject ? 'select' : 'embed'));
		elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
		var fn = open ? 'addEvent' : 'removeEvent';
		window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
		document[fn]('keydown', this.eventKeyDown);
		this.step = 0;
	},
	
	loadContents: function() {		
		if(this.step) return false;
		this.step = 1;
		// check to see if there are specified dimensions
		// if not, fall back to default values
		var aDim = this.rel.match(/[0-9]+/g);
		this.options.contentsWidth = (aDim && (aDim[0] > 0)) ? aDim[0] : this.options.defContentsWidth;
		this.options.contentsHeight = (aDim && (aDim[1] > 0)) ? aDim[1] : this.options.defContentsHeight;

		this.bottom.setStyles({opacity: '0', height: '0px', display: 'none'});
		this.center.className = 'mb_loading';
		this.fx.contents.hide();

		// AJAX call here
		var nextEffect = this.nextEffect.bind(this);
		var ajaxFailure = this.ajaxFailure.bind(this);
		var ajaxOptions = {
			method: 		'get',
			update: 		this.contents, 
			evalScripts: 	this.options.evalScripts,
			evalResponse: 	this.options.evalResponse,
			onComplete: 	nextEffect, 
			onFailure: 		ajaxFailure
		};
		this.ajaxRequest = new Ajax(this.href, ajaxOptions).request();
		return false;
	},
	
	ajaxFailure: function (){
		this.contents.setHTML('');
		this.error.clone().injectInside(this.contents);
		this.nextEffect();
		this.center.setStyle('cursor', 'pointer');
		this.bottom.setStyle('cursor', 'pointer');
		this.center.onclick = this.bottom.onclick = this.close.bind(this);		
	},
	
	nextEffect: function() {
		switch(this.step++) {
		case 1:
			// remove previous styling from the elements 
			// (e.g. styling applied in case of an error)
			this.center.className = '';
			this.center.setStyle('cursor', 'default');
			this.bottom.setStyle('cursor', 'default');
			this.center.onclick = this.bottom.onclick = '';
			this.caption.setHTML(this.title);
			this.contents.setStyles ({width: this.options.contentsWidth + "px", height: this.options.contentsHeight + "px"});	
			if(this.center.clientHeight != this.contents.offsetHeight) {
				this.fx.resize.custom({height: [this.center.clientHeight, this.contents.offsetHeight]});
				break;
			}
			this.step++;

		case 2:
			if(this.center.clientWidth != this.contents.offsetWidth) {
				this.fx.resize.custom({width: [this.center.clientWidth, this.contents.offsetWidth], marginLeft: [-this.center.clientWidth/2, -this.contents.offsetWidth/2]});
				break;
			}
			this.step++;

		case 3:
			this.bottom.setStyles({top: (this.top + this.center.clientHeight)+'px', width: this.contents.style.width, marginLeft: this.center.style.marginLeft, display: ''});
			this.fx.contents.custom(0,1);
			break;

		case 4:
			if(this.options.animateCaption) {
				this.fx.bottom.custom({opacity: [0, 1], height: [0, this.bottom.scrollHeight]});
				break;
			}
			this.bottom.setStyles({opacity: '1', height: this.bottom.scrollHeight+'px'});

		case 5:
			this.step = 0;
		}

	},
	
	keyboardListener: function(event) {
		if ((event.control && event.key == 'w') || (event.control && event.key == 'x') || (event.key == 'esc')) {
			this.close();
			event.stop();
		}		
	},

	close: function() {
		if(this.step < 0) return;
		this.step = -1;
		for(var f in this.fx) this.fx[f].clearTimer();
		this.center.style.display = this.bottom.style.display = 'none';
		this.center.className = 'mb_loading';
		this.fx.overlay.chain(this.setup.pass(false, this)).custom(0);
		return false;
	}

};
Window.onDomReady(Moobox.init.bind(Moobox));