/*!
 * Ext Core Library 3.0
 * http://extjs.com/
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * 
 * MIT Licensed - http://extjs.com/license/mit.txt
 */
Ext.ns('Ext.ux');

Ext.ux.Lightbox = (function(){
	var els = {},
		images = [],
		activeImage,
		initialized = false,
		selectors = [];

	return {
		overlayOpacity: 0.85,
		animate: true,
		resizeSpeed: 8,
		borderSize: 10,
		labelImage: "Image",
		labelOf: "of",

		init: function() {
			this.resizeDuration = this.animate ? ((11 - this.resizeSpeed) * 0.15) : 0;
			this.overlayDuration = this.animate ? 0.2 : 0;

			if(!initialized) {
				Ext.apply(this, Ext.util.Observable.prototype);
				Ext.util.Observable.constructor.call(this);
				this.addEvents('open', 'close');
				this.initMarkup();
				this.initEvents();
				initialized = true;
			}
		},

		initMarkup: function() {
//			els.shim = Ext.DomHelper.append(document.body, {
//			   tag: 'iframe',
//			   id: 'ux-lightbox-shim'
//			}, true);
//			els.overlay = Ext.DomHelper.append(document.body, {
//				id: 'ux-lightbox-overlay'
//			}, true);
			
			var lightboxTpl = new Ext.Template(this.getTemplate());
			els.lightbox = lightboxTpl.append(document.body, {}, true);

			var ids =
				['outerImageContainer', 'imageContainer', 'image', 'hoverNav', 'navPrev', 'navNext', 'loading', 'loadingLink',
				'outerDataContainer', 'dataContainer', 'data', 'details', 'caption', 'imageNumber', 'bottomNav', 'navClose'];

			Ext.each(ids, function(id){
				els[id] = Ext.get('ux-lightbox-' + id);
			});

//			Ext.each([els.overlay, els.lightbox], function(el){
//				el.setVisibilityMode(Ext.Element.DISPLAY)
//				el.hide();
//			});

			els.lightbox.setVisibilityMode(Ext.Element.DISPLAY);
			els.lightbox.hide();

			var size = (this.animate ? 250 : 1) + 'px';
			els.outerImageContainer.setStyle({
				width: size,
				height: size
			});
		},

		getTemplate : function() {
			return [
				'<div id="ux-lightbox">',
					'<div id="ux-lightbox-outerImageContainer">',
						'<div id="ux-lightbox-imageContainer">',
							'<img id="ux-lightbox-image">',
							'<div id="ux-lightbox-hoverNav">',
								'<a href="#" id="ux-lightbox-navPrev"></a>',
								'<a href="#" id="ux-lightbox-navNext"></a>',
							'</div>',
							'<div id="ux-lightbox-loading">',
								'<a id="ux-lightbox-loadingLink"></a>',
							'</div>',
						'</div>',
					'</div>',
					'<div id="ux-lightbox-outerDataContainer">',
						'<div id="ux-lightbox-dataContainer">',
							'<div id="ux-lightbox-data">',
								'<div id="ux-lightbox-details">',
									'<span id="ux-lightbox-caption"></span>',
									'<span id="ux-lightbox-imageNumber"></span>',
								'</div>',
								'<div id="ux-lightbox-bottomNav">',
									'<a href="#" id="ux-lightbox-navClose"></a>',
								'</div>',
							'</div>',
						'</div>',
					'</div>',
				'</div>'
			];
		},

		initEvents: function() {
			var close = function(ev) {
				ev.preventDefault();
				this.close();
			};

//			els.overlay.on('click', close, this);
			els.loadingLink.on('click', close, this);
			els.navClose.on('click', close, this);

			els.lightbox.on('click', function(ev) {
				if(ev.getTarget().id == 'ux-lightbox') {
					this.close();
				}
			}, this);

			els.navPrev.on('click', function(ev) {
				ev.preventDefault();
				this.setImage(activeImage - 1);
			}, this);

			els.navNext.on('click', function(ev) {
				ev.preventDefault();
				this.setImage(activeImage + 1);
			}, this);
		},

		register: function(sel, group) {
			if(selectors.indexOf(sel) === -1) {
				selectors.push(sel);

				Ext.fly(document).on('click', function(ev){
					var target = ev.getTarget(sel);

					if (target) {
						ev.preventDefault();
						this.open(target, sel, group);
					}
				}, this);
			}
		},

		open: function(image, sel, group) {
			group = group || false;
			this.setViewSize();
//			els.overlay.fadeIn({
//				duration: this.overlayDuration,
//				endOpacity: this.overlayOpacity,
//				callback: function() {
					images = [];

					var index = 0;
					if(!group) {
						images.push([image.href, image.title]);
					}
					else {
						var setItems = Ext.query(sel);
						Ext.each(setItems, function(item) {
							if(item.href) {
								images.push([item.href, item.title]);
							}
						});

						while (images[index][0] != image.href) {
							index++;
						}
					}

					// calculate top and left offset for the lightbox
					var pageScroll = Ext.fly(document).getScroll();

					var lightboxTop = pageScroll.top + (Ext.lib.Dom.getViewportHeight() / 10);
					var lightboxLeft = pageScroll.left;
					els.lightbox.setStyle({
						top: lightboxTop + 'px',
						left: lightboxLeft + 'px'
					}).show();

					this.setImage(index);
					
					this.fireEvent('open', images[index]);										
//				},
//				scope: this
//			});
		},
		
		setViewSize: function(){
			var viewSize = this.getViewSize();
//			els.overlay.setStyle({
//				width: viewSize[0] + 'px',
//				height: viewSize[1] + 'px'
//			});
//			els.shim.setStyle({
//				width: viewSize[0] + 'px',
//				height: viewSize[1] + 'px'
//			}).show();
		},

		setImage: function(index){
			activeImage = index;
					  
			this.disableKeyNav();
			if (this.animate) {
				els.loading.show();
			}

			els.image.hide();
			els.hoverNav.hide();
			els.navPrev.hide();
			els.navNext.hide();
			els.dataContainer.setOpacity(0.0001);
			els.imageNumber.hide();

			var preload = new Image();
			preload.onload = (function(){
				els.image.dom.src = images[activeImage][0];
				this.resizeImage(preload.width, preload.height);
			}).createDelegate(this);
			preload.src = images[activeImage][0];
		},

		resizeImage: function(w, h){
			var wCur = els.outerImageContainer.getWidth();
			var hCur = els.outerImageContainer.getHeight();

			var wNew = (w + this.borderSize * 2);
			var hNew = (h + this.borderSize * 2);

			var wDiff = wCur - wNew;
			var hDiff = hCur - hNew;

			var afterResize = function(){
				els.hoverNav.setWidth(els.imageContainer.getWidth() + 'px');

				els.navPrev.setHeight(h + 'px');
				els.navNext.setHeight(h + 'px');

				els.outerDataContainer.setWidth(wNew + 'px');

				this.showImage();
			};
			
			if (hDiff != 0 || wDiff != 0) {
				els.outerImageContainer.shift({
					height: hNew,
					width: wNew,
					duration: this.resizeDuration,
					scope: this,
					callback: afterResize,
					delay: 50
				});
			}
			else {
				afterResize.call(this);
			}
		},

		showImage: function(){
			els.loading.hide();
			els.image.fadeIn({
				duration: this.resizeDuration,
				scope: this,
				callback: function(){
					this.updateDetails();
				}
			});
			this.preloadImages();
		},

		updateDetails: function(){
			var detailsWidth = els.data.getWidth(true) - els.navClose.getWidth() - 10;
			els.details.setWidth((detailsWidth > 0 ? detailsWidth : 0) + 'px');
			
			els.caption.update(images[activeImage][1]);

			els.caption.show();
			if (images.length > 1) {
				els.imageNumber.update(this.labelImage + ' ' + (activeImage + 1) + ' ' + this.labelOf + '  ' + images.length);
				els.imageNumber.show();
			}

			els.dataContainer.fadeIn({
				duration: this.resizeDuration/2,
				scope: this,
				callback: function() {
					var viewSize = this.getViewSize();
//					els.overlay.setHeight(viewSize[1] + 'px');
					this.updateNav();
				}
			});
		},

		updateNav: function(){
			this.enableKeyNav();

			els.hoverNav.show();

			// if not first image in set, display prev image button
			if (activeImage > 0)
				els.navPrev.show();

			// if not last image in set, display next image button
			if (activeImage < (images.length - 1))
				els.navNext.show();
		},

		enableKeyNav: function() {
			Ext.fly(document).on('keydown', this.keyNavAction, this);
		},

		disableKeyNav: function() {
			Ext.fly(document).un('keydown', this.keyNavAction, this);
		},

		keyNavAction: function(ev) {
			var keyCode = ev.getKey();

			if (
				keyCode == 88 || // x
				keyCode == 67 || // c
				keyCode == 27
			) {
				this.close();
			}
			else if (keyCode == 80 || keyCode == 37){ // display previous image
				if (activeImage != 0){
					this.setImage(activeImage - 1);
				}
			}
			else if (keyCode == 78 || keyCode == 39){ // display next image
				if (activeImage != (images.length - 1)){
					this.setImage(activeImage + 1);
				}
			}
		},

		preloadImages: function(){
			var next, prev;
			if (images.length > activeImage + 1) {
				next = new Image();
				next.src = images[activeImage + 1][0];
			}
			if (activeImage > 0) {
				prev = new Image();
				prev.src = images[activeImage - 1][0];
			}
		},

		close: function(){
			this.disableKeyNav();
			els.lightbox.hide();
//			els.overlay.fadeOut({
//				duration: this.overlayDuration
//			});
//			els.shim.hide();
			this.fireEvent('close', activeImage);
		},

		getViewSize: function() {
			return [Ext.lib.Dom.getViewWidth(), Ext.lib.Dom.getViewHeight()];
		}
	}
})();

Ext.onReady(Ext.ux.Lightbox.init, Ext.ux.Lightbox);