dojo.provide("dijit._Templated");

dojo.require("dijit._Widget");

dojo.require("dojo.string");
dojo.require("dojo.parser");

dojo.declare("dijit._Templated",
	null,
	{
		// summary:
		//		mixin for widgets that are instantiated from a template

		// templateNode: DomNode
		//		a node that represents the widget template. Pre-empts both templateString and templatePath.
		templateNode: null,

		// templateString String:
		//		a string that represents the widget template. Pre-empts the
		//		templatePath. In builds that have their strings "interned", the
		//		templatePath is converted to an inline templateString, thereby
		//		preventing a synchronous network call.
		templateString: null,

		// templatePath: String
		//	Path to template (HTML file) for this widget
		templatePath: null,

		// widgetsInTemplate Boolean:
		//		should we parse the template to find widgets that might be
		//		declared in markup inside it? false by default.
		widgetsInTemplate: false,

		// containerNode DomNode:
		//		holds child elements. "containerNode" is generally set via a
		//		dojoAttachPoint assignment and it designates where children of
		//		the src dom node will be placed
		containerNode: null,

		// skipNodeCache Boolean:
		//		if using a cached widget template node poses issues for a
		//		particular widget class, it can set this property to ensure
		//		that its template is always re-built from a string
		_skipNodeCache: false,

		// method over-ride
		buildRendering: function(){
			// summary:
			//		Construct the UI for this widget from a template, setting this.domNode.

			// Lookup cached version of template, and download to cache if it
			// isn't there already.  Returns either a DomNode or a string, depending on
			// whether or not the template contains ${foo} replacement parameters.
			var cached = dijit._Templated.getCachedTemplate(this.templatePath, this.templateString, this._skipNodeCache);

			var node;
			if(dojo.isString(cached)){
				var className = this.declaredClass, _this = this;
				// Cache contains a string because we need to do property replacement
				// do the property replacement
				var tstr = dojo.string.substitute(cached, this, function(value, key){
					if(key.charAt(0) == '!'){ value = _this[key.substr(1)]; }
					if(typeof value == "undefined"){ throw new Error(className+" template:"+key); } // a debugging aide
					if(!value){ return ""; }

					// Substitution keys beginning with ! will skip the transform step,
					// in case a user wishes to insert unescaped markup, e.g. ${!foo}
					return key.charAt(0) == "!" ? value :
						// Safer substitution, see heading "Attribute values" in
						// http://www.w3.org/TR/REC-html40/appendix/notes.html#h-B.3.2
						value.toString().replace(/"/g,"&quot;"); //TODO: add &amp? use encodeXML method?
				}, this);

				node = dijit._Templated._createNodesFromText(tstr)[0];
			}else{
				// if it's a node, all we have to do is clone it
				node = cached.cloneNode(true);
			}

			// recurse through the node, looking for, and attaching to, our
			// attachment points which should be defined on the template node.
			this._attachTemplateNodes(node);

			var source = this.srcNodeRef;
			if(source && source.parentNode){
				source.parentNode.replaceChild(node, source);
			}

			this.domNode = node;
			if(this.widgetsInTemplate){
				var childWidgets = dojo.parser.parse(node);
				this._attachTemplateNodes(childWidgets, function(n,p){
					return n[p];
				});
			}

			this._fillContent(source);
		},

		_fillContent: function(/*DomNode*/ source){
			// summary:
			//		relocate source contents to templated container node
			//		this.containerNode must be able to receive children, or exceptions will be thrown
			var dest = this.containerNode;
			if(source && dest){
				while(source.hasChildNodes()){
					dest.appendChild(source.firstChild);
				}
			}
		},

		_attachTemplateNodes: function(rootNode, getAttrFunc){
			// summary:
			//		map widget properties and functions to the handlers specified in
			//		the dom node and it's descendants. This function iterates over all
			//		nodes and looks for these properties:
			//			* dojoAttachPoint
			//			* dojoAttachEvent	
			//			* waiRole
			//			* waiState
			// rootNode: DomNode|Array[Widgets]
			//		the node to search for properties. All children will be searched.
			// getAttrFunc: function?
			//		a function which will be used to obtain property for a given
			//		DomNode/Widget

			getAttrFunc = getAttrFunc || function(n,p){ return n.getAttribute(p); };

			var nodes = dojo.isArray(rootNode) ? rootNode : (rootNode.all || rootNode.getElementsByTagName("*"));
			var x=dojo.isArray(rootNode)?0:-1;
			for(; x<nodes.length; x++){
				var baseNode = (x == -1) ? rootNode : nodes[x];
				if(this.widgetsInTemplate && getAttrFunc(baseNode,'dojoType')){
					continue;
				}
				// Process dojoAttachPoint
				var attachPoint = getAttrFunc(baseNode, "dojoAttachPoint");
				if(attachPoint){
					var point, points = attachPoint.split(/\s*,\s*/);
					while(point=points.shift()){
						if(dojo.isArray(this[point])){
							this[point].push(baseNode);
						}else{
							this[point]=baseNode;
						}
					}
				}

				// Process dojoAttachEvent
				var attachEvent = getAttrFunc(baseNode, "dojoAttachEvent");
				if(attachEvent){
					// NOTE: we want to support attributes that have the form
					// "domEvent: nativeEvent; ..."
					var event, events = attachEvent.split(/\s*,\s*/);
					var trim = dojo.trim;
					while(event=events.shift()){
						if(event){
							var thisFunc = null;
							if(event.indexOf(":") != -1){
								// oh, if only JS had tuple assignment
								var funcNameArr = event.split(":");
								event = trim(funcNameArr[0]);
								thisFunc = trim(funcNameArr[1]);
							}else{
								event = trim(event);
							}
							if(!thisFunc){
								thisFunc = event;
							}
							this.connect(baseNode, event, thisFunc);
						}
					}
				}

				// waiRole, waiState
				var role = getAttrFunc(baseNode, "waiRole");
				if(role){
					dijit.setWaiRole(baseNode, role);
				}
				var values = getAttrFunc(baseNode, "waiState");
				if(values){
					dojo.forEach(values.split(/\s*,\s*/), function(stateValue){
						if(stateValue.indexOf('-') != -1){
							var pair = stateValue.split('-');
							dijit.setWaiState(baseNode, pair[0], pair[1]);
						}
					});
				}

			}
		}
	}
);

// key is either templatePath or templateString; object is either string or DOM tree
dijit._Templated._templateCache = {};

dijit._Templated.getCachedTemplate = function(templatePath, templateString, alwaysUseString){
	// summary:
	//		static method to get a template based on the templatePath or
	//		templateString key
	// templatePath: String
	//		the URL to get the template from. dojo.uri.Uri is often passed as well.
	// templateString: String?
	//		a string to use in lieu of fetching the template from a URL
	// Returns:
	//	Either string (if there are ${} variables that need to be replaced) or just
	//	a DOM tree (if the node can be cloned directly)

	// is it already cached?
	var tmplts = dijit._Templated._templateCache;
	var key = templateString || templatePath;
	var cached = tmplts[key];
	if(cached){
		return cached;
	}

	// If necessary, load template string from template path
	if(!templateString){
		templateString = dijit._Templated._sanitizeTemplateString(dojo._getText(templatePath));
	}

	templateString = dojo.string.trim(templateString);

	if(templateString.match(/\$\{([^\}]+)\}/g) || alwaysUseString){
		// there are variables in the template so all we can do is cache the string
		return (tmplts[key] = templateString); //String
	}else{
		// there are no variables in the template so we can cache the DOM tree
		return (tmplts[key] = dijit._Templated._createNodesFromText(templateString)[0]); //Node
	}
};

dijit._Templated._sanitizeTemplateString = function(/*String*/tString){
	// summary: 
	//		Strips <?xml ...?> declarations so that external SVG and XML
	// 		documents can be added to a document without worry. Also, if the string
	//		is an HTML document, only the part inside the body tag is returned.
	if(tString){
		tString = tString.replace(/^\s*<\?xml(\s)+version=[\'\"](\d)*.(\d)*[\'\"](\s)*\?>/im, "");
		var matches = tString.match(/<body[^>]*>\s*([\s\S]+)\s*<\/body>/im);
		if(matches){
			tString = matches[1];
		}
	}else{
		tString = "";
	}
	return tString; //String
};


if(dojo.isIE){
	dojo.addOnUnload(function(){
		var cache = dijit._Templated._templateCache;
		for(var key in cache){
			var value = cache[key];
			if(!isNaN(value.nodeType)){ // isNode equivalent
				dojo._destroyElement(value);
			}
			cache[key] = null;
		}
	});
}

(function(){
	var tagMap = {
		cell: {re: /^<t[dh][\s\r\n>]/i, pre: "<table><tbody><tr>", post: "</tr></tbody></table>"},
		row: {re: /^<tr[\s\r\n>]/i, pre: "<table><tbody>", post: "</tbody></table>"},
		section: {re: /^<(thead|tbody|tfoot)[\s\r\n>]/i, pre: "<table>", post: "</table>"}
	};

	// dummy container node used temporarily to hold nodes being created
	var tn;

	dijit._Templated._createNodesFromText = function(/*String*/text){
		// summary:
		//	Attempts to create a set of nodes based on the structure of the passed text.

		if(!tn){
			tn = dojo.doc.createElement("div");
			tn.style.display="none";
			dojo.body().appendChild(tn);
		}
		var tableType = "none";
		var rtext = text.replace(/^\s+/, "");
		for(var type in tagMap){
			var map = tagMap[type];
			if(map.re.test(rtext)){
				tableType = type;
				text = map.pre + text + map.post;
				break;
			}
		}

		tn.innerHTML = text;
		if(tn.normalize){
			tn.normalize();
		}

		var tag = { cell: "tr", row: "tbody", section: "table" }[tableType];
		var _parent = (typeof tag != "undefined") ?
						tn.getElementsByTagName(tag)[0] :
						tn;

		var nodes = [];
		while(_parent.firstChild){
			nodes.push(_parent.removeChild(_parent.firstChild));
		}
		tn.innerHTML="";
		return nodes;	//	Array
	}
})();

// These arguments can be specified for widgets which are used in templates.
// Since any widget can be specified as sub widgets in template, mix it
// into the base widget class.  (This is a hack, but it's effective.)
dojo.extend(dijit._Widget,{
	dojoAttachEvent: "",
	dojoAttachPoint: "",
	waiRole: "",
	waiState:""
})
