/*
	Based on:
	Slimbox v1.3 - The ultimate lightweight Lightbox clone
	by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
	Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/

var Lightbox = {
	init: function(options){
		this.options = Object.extend({
			resizeDuration: 100,
			resizeTransition: Fx.Transitions.linear,
			initialWidth: 200,
			initialHeight: 100,
			animateCaption: false,
			defaultIframeWidth : 750,
			defaultIframeHeight: 580
		}, options || {});

		// IE 6 - XML prolog problem
		if(window.ie6 && document.compatMode=="BackCompat"){
			this.options.animateCaption = false;
		}
		this.anchors = [];
		$each(document.links, function(el){
			if (el.rel && el.rel.test(/^lightbox/i)){
				el.onclick = this.click.pass(el, this);
				this.anchors.push(el);
			}
		}, this);
		this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
		this.eventPosition = this.position.bind(this);
		this.overlay = new Element('div').setProperty('id', 'lbOverlay').injectInside(document.body);
		this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body);
		this.canvas = new Element('div').setProperty('id', 'lbCanvas').injectInside(this.center);
		this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.canvas);
		this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.canvas);
		//this.prevLink.onclick = this.previous.bind(this);
		//this.nextLink.onclick = this.next.bind(this);

		this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(document.body);
		this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
		new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
		this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
		this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
		new Element('div').setStyle('clear', 'both').injectInside(this.bottom);
		/* Build effects */
		var nextEffect = this.nextEffect.bind(this);
		this.fx = {
			overlay: this.overlay.effect('opacity', {duration: 200}).hide(),
			resizeCenter: this.center.effects({duration: 1, transition: this.options.resizeTransition, onComplete: nextEffect}),
			image: this.canvas.effect('opacity', {duration: 200, onComplete: nextEffect}),
			bottom: this.bottomContainer.effect('height', {duration: 200, onComplete: nextEffect})
		};
	},

	scanLinks: function(){
		$each(document.links, function(el){
			if (el.rel && el.rel.test(/^lightbox/i)){
				el.onclick = this.click.pass(el, this);
				this.anchors.push(el);
			}
		},this);
	},

	click: function(link){
		if (link.rel.length == 8) {
			if($defined(link.attributes['width']) && $defined(link.attributes['height'])){
				this.options.defaultIframeWidth = link.attributes['width'].value;
				this.options.defaultIframeHeight = link.attributes['height'].value;
			}else{
				this.options.defaultIframeWidth = 750;
                                this.options.defaultIframeHeight = 580;
			}
			return this.show(link.href, link.title, link.rev);
		}
	},

	show: function(url, title, rev){
		return this.open([[url, title, rev]], 0);
	},

	open: function(items, itemNumber){
		this.items = items;
		this.position();
		this.setup(true);
		var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
		var st = document.body.scrollTop  || document.documentElement.scrollTop;
		this.top = st + (wh / 15);
		this.center.setStyles({top: this.top+'px', display: ''});
		this.fx.overlay.start(0.8);
		return this.changeItem(itemNumber);
		
	},

	position: function(){
		//IE6 - XML prolog problem.
		var ww = (window.getWidth() == 0) ? window.getScrollWidth()-22 : window.getWidth();
		var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
		var st = document.body.scrollTop  || document.documentElement.scrollTop;
		this.overlay.setStyles({top: st+'px', height: wh+'px', width:ww+'px'});
	},

	setup: function(open){
		var elements = $A(document.getElementsByTagName('object'));
		if (window.ie) elements.extend(document.getElementsByTagName('select'));
		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;
		if (window.myGallery)
			if (open){  
				myGallery.stopSliding();
				$('myGallery').style.display = 'none';
			}else{
				myGallery.resumeSliding();
				$('myGallery').style.display = 'block'
			}
	},

	keyboardListener: function(event){
		//switch (event.keyCode){
		//	case 27: case 88: case 67: this.close(); break;
		//}
	},

	changeItem: function(itemNumber){
		if (this.step || (itemNumber < 0) || (itemNumber >= this.items.length)) return false;
		this.step = 1;
		this.activeItem = itemNumber;
		this.bottomContainer.style.display = 'none';
		this.fx.image.hide();
		this.center.className = 'lbLoading';
		// discard previous content by clicking
		this.removeCurrentItem();
		// check item type
		var url = this.items[this.activeItem][0];
		var rev = this.items[this.activeItem][2];
		this.preload = new Object ();	// JavaScript native Object
		this.preload.datatype = 'iframe';
		this.preload.w =  this.matchOrDefault(rev, new RegExp("width=(\\d+)", "i"), this.options.defaultIframeWidth);
		this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+)", "i"), this.options.defaultIframeHeight);
		this.preload.src = url;
		this.nextEffect(); //asynchronous loading
		return false;
	},

	nextEffect: function(){
		switch (this.step++){
		case 1:
			this.center.className = '';
			this.p_width = this.preload.w;
			this.p_height = this.preload.h;
			// Safari would not update iframe content that has static id.
			this.iframeId = "lbFrame_"+new Date().getTime();
			new Element('iframe').setProperties({id: this.iframeId, width: this.p_width, height: this.p_height, frameBorder:0, scrolling:'no', src:this.preload.src}).injectInside(this.canvas);
			this.nextLink.style.right = '25px';
			this.canvas.style.width = this.bottom.style.width = this.p_width+'px';
			this.bottom.style.width = eval(this.p_width)+2+'px';
			this.canvas.style.height = this.p_height+'px';

			this.caption.setHTML(this.items[this.activeItem][1] || '');
			this.number.setHTML( (this.items.length == 1) ? '' : 'Page ' + (this.activeItem+1) + ' of ' + this.items.length );

			if (this.activeItem) this.preloadPrev.src = this.items[this.activeItem-1][0];
			if (this.activeItem != (this.items.length - 1)) this.preloadNext.src = this.items[this.activeItem+1][0];
			if (this.center.clientHeight != this.canvas.offsetHeight){
				var oh = (this.p_height == this.canvas.clientHeight) ? this.canvas.offsetHeight : eval(this.p_height)+18; // fix for ie
				this.fx.resizeCenter.start({height: oh});
				break;
			}

			this.step++;
		case 2:
			if (this.center.clientWidth != this.canvas.offsetWidth){
				var ow = (this.p_width == this.canvas.clientWidth) ? this.canvas.offsetWidth : eval(this.p_width)+18; // fix for ie
				this.fx.resizeCenter.start({width: ow, marginLeft: -ow/2});
				break;
			}
			this.step++;
		case 3:
			this.bottomContainer.setStyles({top: (this.top-23)+'px', height:'0px', marginLeft: (this.center.style.marginLeft.substring(0, this.center.style.marginLeft.length-2).toInt() + 25)+'px' , width:this.center.style.width, display: ''});
			this.fx.image.start(1);
			break;
		case 4:
			if (this.options.animateCaption){
				// This is not smooth animation in IE 6 with XML prolog.
				// If your site is XHTML strict with XML prolog, disable this option.
				this.fx.bottom.start(0,this.bottom.offsetHeight-10);
				break;
			}
			this.bottomContainer.style.height = (this.bottom.offsetHeight+20)+'px';
		case 5:
			this.step = 0;
		}
	},

	close: function(){
		if (this.step < 0) return;
		this.step = -1;
		this.removeCurrentItem();	// discard content
		for (var f in this.fx) this.fx[f].stop();
		this.center.style.display = this.bottomContainer.style.display = 'none';
		this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
		return false;
	},

	removeCurrentItem: function(){
		if (this.preload){
			$(this.iframeId).remove();
			this.preload = null;
		}		
	},

	matchOrDefault: function(str, re, val){
		var hasQuery = str.match(re);
		return hasQuery ? hasQuery[1] : val;
	}

};

window.addEvent('domready', Lightbox.init.bind(Lightbox));