/*
	Copyright (c) 2004-2012, The Dojo Foundation All Rights Reserved.
	Available via Academic Free License >= 2.1 OR the modified BSD license.
	see: http://dojotoolkit.org/license for details
*/


if(!dojo._hasResource["dojox.image.LightboxNano"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.image.LightboxNano"] = true;
dojo.provide("dojox.image.LightboxNano");
dojo.require("dojo.fx");


	var abs = "absolute",
		vis = "visibility",
		getViewport = function(){
			//	summary: Returns the dimensions and scroll position of the viewable area of a browser window
			var scrollRoot = (dojo.doc.compatMode == "BackCompat") ? dojo.body() : dojo.doc.documentElement,
				scroll = dojo._docScroll();
				return { w: scrollRoot.clientWidth, h: scrollRoot.clientHeight, l: scroll.x, t: scroll.y };
			}
	;

	dojo.declare("dojox.image.LightboxNano", null, {
		//	summary:
		//		A simple "nano" version of the lightbox.
		//
		//	description:
		//		Very lightweight lightbox which only displays a larger image.  There is
		//		no support for a caption or description.  The lightbox can be closed by
		//		clicking any where or pressing any key.  This widget is intended to be
		//		used on <a> and <img> tags.  Upon creation, if the domNode is <img> tag,
		//		then it is wrapped in an <a> tag, then a <div class="enlarge"> is placed
		//		inside the <a> and can be styled to display an icon that the original
		//		can be enlarged.
		//
		//	example:
		//	|	<a dojoType="dojox.image.LightboxNano" href="/path/to/largeimage.jpg"><img src="/path/to/thumbnail.jpg"></a>
		//
		//	example:
		//	|	<img dojoType="dojox.image.LightboxNano" src="/path/to/thumbnail.jpg" href="/path/to/largeimage.jpg">

		//	href: string
		//		URL to the large image to show in the lightbox.
		href: "",

		//	duration: int
		//		The delay in milliseconds of the LightboxNano open and close animation.
		duration: 500,

		//	preloadDelay: int
		//		The delay in milliseconds after the LightboxNano is created before preloading the larger image.
		preloadDelay: 5000,

		constructor: function(/*Object?*/p, /*DomNode?*/n){
			// summary: Initializes the DOM node and connect onload event
			var _this = this;

			dojo.mixin(_this, p);
			n = _this._node = dojo.byId(n);

			// if we have a origin node, then prepare it to show the LightboxNano
			if(n){
				if(!/a/i.test(n.tagName)){
					var a = dojo.create("a", { href: _this.href, "class": n.className }, n, "after");
					n.className = "";
					a.appendChild(n);
					n = a;
				}

				dojo.style(n, "position", "relative");
				_this._createDiv("dojoxEnlarge", n);
				dojo.setSelectable(n, false);
				_this._onClickEvt = dojo.connect(n, "onclick", _this, "_load");
			}

			if(_this.href){
				setTimeout(function(){
					(new Image()).src = _this.href;
					_this._hideLoading();
				}, _this.preloadDelay);
			}
		},

		destroy: function(){
			// summary: Destroys the LightboxNano and it's DOM node
			var a = this._connects || [];
			a.push(this._onClickEvt);
			dojo.forEach(a, dojo.disconnect);
			dojo.destroy(this._node);
		},

		_createDiv: function(/*String*/cssClass, /*DomNode*/refNode, /*boolean*/display){
			// summary: Creates a div for the enlarge icon and loading indicator layers
			return dojo.create("div", { // DomNode
				"class": cssClass,
				style: {
					position: abs,
					display: display ? "" : "none"
				}
			}, refNode);
		},

		_load: function(/*Event*/e){
			// summary: Creates the large image and begins to show it
			var _this = this;

			e && dojo.stopEvent(e);

			if(!_this._loading){
				_this._loading = true;
				_this._reset();

				var i = _this._img = dojo.create("img", {
						style: {
							visibility: "hidden",
							cursor: "pointer",
							position: abs,
							top: 0,
							left: 0,
							zIndex: 9999999
						}
					}, dojo.body()),
					ln = _this._loadingNode,
					n = dojo.query("img", _this._node)[0] || _this._node,
					a = dojo.position(n, true),
					c = dojo.contentBox(n),
					b = dojo._getBorderExtents(n)
				;

				if(ln == null){
					_this._loadingNode = ln = _this._createDiv("dojoxLoading", _this._node, true);
					var l = dojo.marginBox(ln);
					dojo.style(ln, {
						left: parseInt((c.w - l.w) / 2) + "px",
						top: parseInt((c.h - l.h) / 2) + "px"
					});
				}

				c.x = a.x - 10 + b.l;
				c.y = a.y - 10 + b.t;
				_this._start = c;

				_this._connects = [dojo.connect(i, "onload", _this, "_show")];

				i.src = _this.href;
			}
		},

		_hideLoading: function(){
			// summary: Hides the animated loading indicator
			if(this._loadingNode){
				dojo.style(this._loadingNode, "display", "none");
			}
			this._loadingNode = false;
		},

		_show: function(){
			// summary: The image is now loaded, calculate size and display
			var _this = this,
				vp = getViewport(),
				w = _this._img.width,
				h = _this._img.height,
				vpw = parseInt((vp.w - 20) * 0.9),
				vph = parseInt((vp.h - 20) * 0.9),
				dd = dojo.doc,
				bg = _this._bg = dojo.create("div", {
					style: {
						backgroundColor: "#000",
						opacity: 0.0,
						position: abs,
						zIndex: 9999998
					}
				}, dojo.body()),
				ln = _this._loadingNode
			;

			if(_this._loadingNode){
				_this._hideLoading();
			}
			dojo.style(_this._img, {
				border: "10px solid #fff",
				visibility: "visible"
			});
			dojo.style(_this._node, vis, "hidden");

			_this._loading = false;

			_this._connects = _this._connects.concat([
				dojo.connect(dd, "onmousedown", _this, "_hide"),
				dojo.connect(dd, "onkeypress", _this, "_key"),
				dojo.connect(window, "onresize", _this, "_sizeBg")
			]);

			if(w > vpw){
				h = h * vpw / w;
				w = vpw;
			}
			if(h > vph){
				w = w * vph / h;
				h = vph;
			}

			_this._end = {
				x: (vp.w - 20 - w) / 2 + vp.l,
				y: (vp.h - 20 - h) / 2 + vp.t,
				w: w,
				h: h
			};

			_this._sizeBg();

			dojo.fx.combine([
				_this._anim(_this._img, _this._coords(_this._start, _this._end)),
				_this._anim(bg, { opacity: 0.5 })
			]).play();
		},

		_sizeBg: function(){
			// summary: Resize the background to fill the page
			var dd = dojo.doc.documentElement;
			dojo.style(this._bg, {
				top: 0,
				left: 0,
				width: dd.scrollWidth + "px",
				height: dd.scrollHeight + "px"
			});
		},

		_key: function(/*Event*/e){
			// summary: A key was pressed, so hide the lightbox
			dojo.stopEvent(e);
			this._hide();
		},

		_coords: function(/*Object*/s, /*Object*/e){
			// summary: Returns animation parameters with the start and end coords
			return { // Object
				left:	{ start: s.x, end: e.x },
				top:	{ start: s.y, end: e.y },
				width:	{ start: s.w, end: e.w },
				height:	{ start: s.h, end: e.h }
			};
		},

		_hide: function(){
			// summary: Closes the lightbox
			var _this = this;
			dojo.forEach(_this._connects, dojo.disconnect);
			_this._connects = [];
			dojo.fx.combine([
				_this._anim(_this._img, _this._coords(_this._end, _this._start), "_reset"),
				_this._anim(_this._bg, {opacity:0})
			]).play();
		},

		_reset: function(){
			// summary: Destroys the lightbox
			dojo.style(this._node, vis, "visible");
			dojo.destroy(this._img);
			dojo.destroy(this._bg);
			this._img = this._bg = null;
			this._node.focus();
		},

		_anim: function(/*DomNode*/node, /*Object*/args, /*Function*/onEnd){
			// summary: Creates the lightbox open/close and background fadein/out animations
			return dojo.animateProperty({ // dojo.Animation
				node: node,
				duration: this.duration,
				properties: args,
				onEnd: onEnd ? dojo.hitch(this, onEnd) : null
			});
		},
		
		show: function(/*Object?*/args){
			// summary:
			//		Shows this LightboxNano programatically. Allows passing a new href and
			//		a programatic origin.
			//
			// args: Object?
			//		An object with optional members of `href` and `origin`.
			//		`origin` can be be a String|Id of a DomNode to use when
			//		animating the openeing of the image (the 'box' effect starts
			//		from this origin point. eg: { origin: e.target })
			//		If there's no origin, it will use the center of the viewport.
			//		The `href` member is a string URL for the image to be
			//		displayed. Omiting either of these members will revert to
			//		the default href (which could be absent in some cases) and
			//		the original srcNodeRef for the widget.
			args = args || {};
			this.href = args.href || this.href;

			var n = dojo.byId(args.origin),
				vp = getViewport();

			// if we don't have a valid origin node, then create one as a reference
			// that is centered in the viewport
			this._node = n || dojo.create("div", {
					style: {
						position: abs,
						width: 0,
						hieght: 0,
						left: (vp.l + (vp.w / 2)) + "px",
						top: (vp.t + (vp.h / 2)) + "px"
					}
				}, dojo.body())
			;

			this._load();

			// if we don't have a valid origin node, then destroy the centered reference
			// node since load() has already been called and it's not needed anymore.
			if(!n){
				dojo.destroy(this._node);
			}
		}
	});

}
