dojo.provide("dojox.editor.plugins.InsertAnchor");

dojo.require("dijit._Widget");
dojo.require("dijit._Templated");
dojo.require("dijit._editor._Plugin");
dojo.require("dijit.TooltipDialog");
dojo.require("dijit.form.Button");
dojo.require("dijit.form.ValidationTextBox");
dojo.require("dijit.form.Select");
dojo.require("dijit._editor.range");
dojo.require("dojo.i18n");
dojo.require("dojo.string");
dojo.requireLocalization("dijit", "common");
dojo.requireLocalization("dojox.editor.plugins", "InsertAnchor");

dojo.declare("dojox.editor.plugins.InsertAnchor", dijit._editor._Plugin, {
	// summary:
	//		This plugin provides the basis for an insert anchor dialog for the
	//		dijit.Editor
	//
	// description:
	//		The command provided by this plugin is:
	//		* insertAnchor

	// htmlTemplate: [protected] String
	//		String used for templating the HTML to insert at the desired point.
	htmlTemplate: "<a name=\"${anchorInput}\" class=\"dijitEditorPluginInsertAnchorStyle\">${textInput}</a>",

	// iconClassPrefix: [const] String
	//		The CSS class name for the button node icon.
	iconClassPrefix: "dijitAdditionalEditorIcon",

	// linkDialogTemplate: [private] String
	//		Template for contents of TooltipDialog to pick URL
	_template: [
		"<table><tr><td>",
		"<label for='${id}_anchorInput'>${anchor}</label>",
		"</td><td>",
		"<input dojoType='dijit.form.ValidationTextBox' required='true' " +
		"id='${id}_anchorInput' name='anchorInput' intermediateChanges='true'>",
		"</td></tr><tr><td>",
		"<label for='${id}_textInput'>${text}</label>",
		"</td><td>",
		"<input dojoType='dijit.form.ValidationTextBox' required='true' id='${id}_textInput' " +
		"name='textInput' intermediateChanges='true'>",
		"</td></tr>",
		"<tr><td colspan='2'>",
		"<button dojoType='dijit.form.Button' type='submit' id='${id}_setButton'>${set}</button>",
		"<button dojoType='dijit.form.Button' type='button' id='${id}_cancelButton'>${cancel}</button>",
		"</td></tr></table>"
	].join(""),

	_initButton: function(){
		// Override _Plugin._initButton() to initialize DropDownButton and TooltipDialog.
		var _this = this;
		var messages = dojo.i18n.getLocalization("dojox.editor.plugins", "InsertAnchor", this.lang);

		// Build the dropdown dialog we'll use for the button
		var dropDown = (this.dropDown = new dijit.TooltipDialog({
			title: messages["title"],
			execute: dojo.hitch(this, "setValue"),
			onOpen: function(){
				_this._onOpenDialog();
				dijit.TooltipDialog.prototype.onOpen.apply(this, arguments);
			},
			onCancel: function(){
				setTimeout(dojo.hitch(_this, "_onCloseDialog"),0);
			}
		}));

		this.button = new dijit.form.DropDownButton({
			label: messages["insertAnchor"],
			showLabel: false,
			iconClass: this.iconClassPrefix + " " + this.iconClassPrefix + "InsertAnchor",
			tabIndex: "-1",
			dropDown: this.dropDown
		});

		messages.id = dijit.getUniqueId(this.editor.id);
		this._uniqueId = messages.id;

		this.dropDown.set('content', dropDown.title +
			"<div style='border-bottom: 1px black solid;padding-bottom:2pt;margin-bottom:4pt'></div>" +
			dojo.string.substitute(this._template, messages));

		dropDown.startup();
		this._anchorInput = dijit.byId(this._uniqueId + "_anchorInput");
		this._textInput = dijit.byId(this._uniqueId + "_textInput");
		this._setButton = dijit.byId(this._uniqueId + "_setButton");
		this.connect(dijit.byId(this._uniqueId + "_cancelButton"), "onClick", function(){
			this.dropDown.onCancel();
		});

		if(this._anchorInput){
			this.connect(this._anchorInput, "onChange", "_checkInput");
		}
		if(this._textInput){
			this.connect(this._anchorInput, "onChange", "_checkInput");
		}

		//Register some filters to handle setting/removing the class tags on anchors.
		this.editor.contentDomPreFilters.push(dojo.hitch(this, this._preDomFilter));
		this.editor.contentDomPostFilters.push(dojo.hitch(this, this._postDomFilter));
		this._setup();
	},

	setEditor: function(editor){
		// summary:
		//		Over-ride for the setting of the editor.
		// editor: Object
		//		The editor to configure for this plugin to use.
		this.editor = editor;
		this._initButton();
	},

	_checkInput: function(){
		// summary:
		//		Function to check the input to the dialog is valid 
		//		and enable/disable set button
		// tags:
		//		private
		var disable = true;
		if(this._anchorInput.isValid()){
			disable = false;
		}
		this._setButton.set("disabled", disable);
	},

	_setup: function(){
		// summary:
		//		Over-ridable function that connects tag specific events.
		this.editor.onLoadDeferred.addCallback(dojo.hitch(this, function(){
			this.connect(this.editor.editNode, "ondblclick", this._onDblClick);
			setTimeout(dojo.hitch(this, function() {
				this._applyStyles();
			}), 100);
		}));
	},

	getAnchorStyle: function(){
		// summary:
		//		Over-ridable function for getting the style to apply to the anchor.
		//		The default is a dashed border with an anchor symbol.
		// tags:
		//		public
		var style = "@media screen {\n" +
				"\t.dijitEditorPluginInsertAnchorStyle {\n" +
				"\t\tbackground-image: url({MODURL}/images/anchor.gif);\n" +
				"\t\tbackground-repeat: no-repeat;\n"	+
				"\t\tbackground-position: top left;\n" +
				"\t\tborder-width: 1px;\n" +
				"\t\tborder-style: dashed;\n" +
				"\t\tborder-color: #D0D0D0;\n" +
				 "\t\tpadding-left: 20px;\n" +
			"\t}\n" +
		"}\n";

		//Finally associate in the image locations based off the module url.
		var modurl = dojo.moduleUrl(dojox._scopeName, "editor/plugins/resources").toString();
		if(!(modurl.match(/^https?:\/\//i)) &&
			!(modurl.match(/^file:\/\//i))){
			// We have to root it to the page location on webkit for some nutball reason. 
			// Probably has to do with how iframe was loaded.
			var bUrl;
			if(modurl.charAt(0) === "/"){
				//Absolute path on the server, so lets handle...
				var proto = dojo.doc.location.protocol;
				var hostn = dojo.doc.location.host;
				bUrl = proto + "//" + hostn;
			}else{
				bUrl = this._calcBaseUrl(dojo.global.location.href);
			}
			if(bUrl[bUrl.length - 1] !== "/" && modurl.charAt(0) !== "/"){
				bUrl += "/";
			}
			modurl = bUrl + modurl;
		}
		return style.replace(/\{MODURL\}/gi, modurl);
	},

	_applyStyles: function(){
		// summary:
		//		Function to apply a style to inserted anchor tags so that
		//		they are obviously anchors.
		if(!this._styled){
			try{
				//Attempt to inject our specialized style rules for doing this.
				this._styled = true;
				var doc = this.editor.document;
				var style = this.getAnchorStyle();
				if(!dojo.isIE){
					var sNode = doc.createElement("style");
					sNode.appendChild(doc.createTextNode(style));
					doc.getElementsByTagName("head")[0].appendChild(sNode);
				}else{
					var ss = doc.createStyleSheet("");
					ss.cssText = style;
				}
			 }catch(e){ /* Squelch */ }
		 }
	},

	_calcBaseUrl: function(fullUrl) {
		// summary:
		//		Internal function used to figure out the full root url (no relatives)
		//		for loading images in the styles in the iframe.
		// fullUrl: String
		//		The full url to tear down to the base.
		// tags:
		//		private
		var baseUrl = null;
		if (fullUrl !== null) {
			// Check to see if we need to strip off any query parameters from the Url.
			var index = fullUrl.indexOf("?");
			if (index != -1) {
				fullUrl = fullUrl.substring(0,index);
			}

			// Now we need to trim if necessary.  If it ends in /, then we don't 
			// have a filename to trim off so we can return.
			index = fullUrl.lastIndexOf("/");
			if (index > 0 && index < fullUrl.length) {
				baseUrl = fullUrl.substring(0,index);
			}else{
				baseUrl = fullUrl;
			}
		}
		return baseUrl; //String
	},

	_checkValues: function(args){
		// summary:
		//		Function to check the values in args and 'fix' them up as needed.
		// args: Object
		//		Content being set.		
		// tags: 
		//		protected
		if(args){
			if(args.anchorInput){
				args.anchorInput = args.anchorInput.replace(/"/g, "&quot;");
			}
			if(!args.textInput){
				// WebKit doesn't work with double-click select unless there's
				// a space in the anchor text, so put a in the case of
				// empty desc.
				args.textInput = "&nbsp;";
			}
		}
		return args;
	},

	setValue: function(args){
		// summary:
		//		Callback from the dialog when user presses "set" button.
		// tags:
		//		private
		this._onCloseDialog();
		if(!this.editor.window.getSelection){
			// IE check without using user agent string.
			var sel = dijit.range.getSelection(this.editor.window);
			var range = sel.getRangeAt(0);
			var a = range.endContainer;
			if(a.nodeType === 3){
				// Text node, may be the link contents, so check parent.
				// This plugin doesn't really support nested HTML elements
				// in the link, it assumes all link content is text.
				a = a.parentNode;
			}
			if(a && (a.nodeName && a.nodeName.toLowerCase() !== "a")){
				// Stll nothing, one last thing to try on IE, as it might be 'img'
				// and thus considered a control.
				a = dojo.withGlobal(this.editor.window,
					"getSelectedElement", dijit._editor.selection, ["a"]);
			}
			if(a && (a.nodeName && a.nodeName.toLowerCase() === "a")){
				// Okay, we do have a match.  IE, for some reason, sometimes pastes before
				// instead of removing the targetted paste-over element, so we unlink the
				// old one first.  If we do not the <a> tag remains, but it has no content,
				// so isn't readily visible (but is wrong for the action).
				if(this.editor.queryCommandEnabled("unlink")){
					// Select all the link childent, then unlink.  The following insert will
					// then replace the selected text.
					dojo.withGlobal(this.editor.window,
						"selectElementChildren", dijit._editor.selection, [a]);
					this.editor.execCommand("unlink");
				}
			}
		}
		// make sure values are properly escaped, etc.
		args = this._checkValues(args); 
		this.editor.execCommand('inserthtml',
			dojo.string.substitute(this.htmlTemplate, args));
	},

	_onCloseDialog: function(){
		// summary:
		//		Handler for close event on the dialog
		this.editor.focus();
	},

	_getCurrentValues: function(a){
		// summary:
		//		Over-ride for getting the values to set in the dropdown.
		// a:
		//		The anchor/link to process for data for the dropdown.
		// tags:
		//		protected
		var anchor, text;
		if(a && a.tagName.toLowerCase() === "a" && dojo.attr(a, "name")){
			anchor = dojo.attr(a, "name");
			text = a.textContent || a.innerText;
			dojo.withGlobal(this.editor.window, "selectElement", dijit._editor.selection, [a, true]);
		}else{
			text = dojo.withGlobal(this.editor.window, dijit._editor.selection.getSelectedText);
		}
		return {anchorInput: anchor || '', textInput: text || ''}; //Object;
	},

	_onOpenDialog: function(){
		// summary:
		//		Handler for when the dialog is opened.
		//		If the caret is currently in a URL then populate the URL's info into the dialog.
		var a;
		if(!this.editor.window.getSelection){
			// IE is difficult to select the element in, using the range unified
			// API seems to work reasonably well.
			var sel = dijit.range.getSelection(this.editor.window);
			var range = sel.getRangeAt(0);
			a = range.endContainer;
			if(a.nodeType === 3){
				// Text node, may be the link contents, so check parent.
				// This plugin doesn't really support nested HTML elements
				// in the link, it assumes all link content is text.
				a = a.parentNode;
			}
			if(a && (a.nodeName && a.nodeName.toLowerCase() !== "a")){
				// Stll nothing, one last thing to try on IE, as it might be 'img'
				// and thus considered a control.
				a = dojo.withGlobal(this.editor.window,
					"getSelectedElement", dijit._editor.selection, ["a"]);
			}
		}else{
			a = dojo.withGlobal(this.editor.window,
				"getAncestorElement", dijit._editor.selection, ["a"]);
		}
		this.dropDown.reset();
		this._setButton.set("disabled", true);
		this.dropDown.set("value", this._getCurrentValues(a));
	},

	_onDblClick: function(e){
		// summary:
		//		Function to define a behavior on double clicks on the element
		//		type this dialog edits to select it and pop up the editor
		//		dialog.
		// e: Object
		//		The double-click event.
		// tags:
		//		protected.
		if(e && e.target){
			var t = e.target;
			var tg = t.tagName? t.tagName.toLowerCase() : "";
			if(tg === "a" && dojo.attr(t, "name")){
				this.editor.onDisplayChanged();
				dojo.withGlobal(this.editor.window,
					 "selectElement",
					 dijit._editor.selection, [t]);
				setTimeout(dojo.hitch(this, function(){
					// Focus shift outside the event handler.
					// IE doesn't like focus changes in event handles.
					this.button.set("disabled", false);
					this.button.openDropDown();
				}), 10);
			}
		}
	},

	_preDomFilter: function(node){
		// summary:
		//		A filter to identify the 'a' tags and if they're anchors, 
		//		apply the right style to them.
		// node:
		//		The node to search from.
		// tags:
		//		private
		var ed = this.editor;
		dojo.withGlobal(ed.window, function(){
			dojo.query("a", ed.editNode).forEach(function(a){
				if(dojo.attr(a, "name") && !dojo.attr(a, "href")){
					if(!dojo.hasClass(a,"dijitEditorPluginInsertAnchorStyle")){
						dojo.addClass(a, "dijitEditorPluginInsertAnchorStyle");
					}
				}
			});
		});
	},

	_postDomFilter: function(node){
		// summary:
		//		A filter to identify the 'a' tags and if they're anchors, 
		//		remove the class style that shows up in the editor from
		//		them.
		// node:
		//		The node to search from.
		// tags:
		//		private
		var ed = this.editor;
		dojo.withGlobal(ed.window, function(){
			dojo.query("a", node).forEach(function(a){
				if(dojo.attr(a, "name") && !dojo.attr(a, "href")){
					if(dojo.hasClass(a,"dijitEditorPluginInsertAnchorStyle")){
						dojo.removeClass(a, "dijitEditorPluginInsertAnchorStyle");
					}
				}
			});
		});
		return node;
	}
});


// Register this plugin.
dojo.subscribe(dijit._scopeName + ".Editor.getPlugin",null,function(o){
	if(o.plugin){ return; }
	var name = o.args.name;
	if(name) { name = name.toLowerCase(); }
	if(name === "insertanchor"){
		o.plugin = new dojox.editor.plugins.InsertAnchor();
	}
});
