dojo.provide("dijit.InlineEditBox");

dojo.require("dojo.i18n");

dojo.require("dijit._Widget");
dojo.require("dijit._Container");
dojo.require("dijit.form.Button");
dojo.require("dijit.form.TextBox");

dojo.requireLocalization("dijit", "common");

dojo.declare("dijit.InlineEditBox",
	dijit._Widget,
	{
	// summary:
	//		An element with in-line edit capabilitites
	//
	// description:
	//		Behavior for an existing node (`<p>`, `<div>`, `<span>`, etc.) so that
	// 		when you click it, an editor shows up in place of the original
	//		text.  Optionally, Save and Cancel button are displayed below the edit widget.
	//		When Save is clicked, the text is pulled from the edit
	//		widget and redisplayed and the edit widget is again hidden.
	//		By default a plain Textarea widget is used as the editor (or for
	//		inline values a TextBox), but you can specify an editor such as
	//		dijit.Editor (for editing HTML) or a Slider (for adjusting a number).
	//		An edit widget must support the following API to be used:
	//			- displayedValue or value as initialization parameter,
	//			and available through attr('displayedValue') / attr('value')
	//			- void focus()
	//			- DOM-node focusNode = node containing editable text

	// editing: [readonly] Boolean
	//		Is the node currently in edit mode?
	editing: false,

	// autoSave: Boolean
	//		Changing the value automatically saves it; don't have to push save button
	//		(and save button isn't even displayed)
	autoSave: true,

	// buttonSave: String
	//		Save button label
	buttonSave: "",

	// buttonCancel: String
	//		Cancel button label
	buttonCancel: "",

	// renderAsHtml: Boolean
	//		Set this to true if the specified Editor's value should be interpreted as HTML
	//		rather than plain text (ex: `dijit.Editor`)
	renderAsHtml: false,

	// editor: String
	//		Class name for Editor widget
	editor: "dijit.form.TextBox",

	// editorParams: Object
	//		Set of parameters for editor, like {required: true}
	editorParams: {},

	onChange: function(value){
		// summary:
		//		Set this handler to be notified of changes to value.
		// tags:
		//		callback
	},
	
	onCancel: function(){
		// summary:
		//		Set this handler to be notified when editing is cancelled.
		// tags:
		//		callback
	},

	// width: String
	//		Width of editor.  By default it's width=100% (ie, block mode).
	width: "100%",

	// value: String
	//		The display value of the widget in read-only mode
	value: "",

	// noValueIndicator: [const] String
	//		The text that gets displayed when there is no value (so that the user has a place to click to edit)
	noValueIndicator: "<span style='font-family: wingdings; text-decoration: underline;'>&nbsp;&nbsp;&nbsp;&nbsp;&#x270d;&nbsp;&nbsp;&nbsp;&nbsp;</span>",

	constructor: function(){
		// summary:
		//		Sets up private arrays etc.
		// tags:
		//		private
		this.editorParams = {};
	},

	postMixInProperties: function(){
		this.inherited(arguments);

		// save pointer to original source node, since Widget nulls-out srcNodeRef
		this.displayNode = this.srcNodeRef;

		// connect handlers to the display node
		var events = {
			ondijitclick: "_onClick",
			onmouseover: "_onMouseOver",
			onmouseout: "_onMouseOut",
			onfocus: "_onMouseOver",
			onblur: "_onMouseOut"			
		};
		for(var name in events){
			this.connect(this.displayNode, name, events[name]);
		}
		dijit.setWaiRole(this.displayNode, "button");
		if(!this.displayNode.getAttribute("tabIndex")){
			this.displayNode.setAttribute("tabIndex", 0);
		}

		this.attr('value', this.value || this.displayNode.innerHTML);
	},

	setDisabled: function(/*Boolean*/ disabled){
		// summary:
		//		Deprecated.   Use attr('disable', ...) instead.
		// tags:
		//		deprecated
		dojo.deprecated("dijit.InlineEditBox.setDisabled() is deprecated.  Use attr('disabled', bool) instead.", "", "2.0");
		this.attr('disabled', disabled);
	},
	_setDisabledAttr: function(/*Boolean*/ disabled){
		// summary: 
		//		Hook to make attr("disabled", ...) work.
		//		Set disabled state of widget.
		this.disabled = disabled;
		dijit.setWaiState(this.domNode, "disabled", disabled);
	},

	_onMouseOver: function(){
		// summary:
		//		Handler for onmouseover event.
		// tags:
		//		private
		dojo.addClass(this.displayNode, this.disabled ? "dijitDisabledClickableRegion" : "dijitClickableRegion");
	},

	_onMouseOut: function(){
		// summary:
		//		Handler for onmouseout event.
		// tags:
		//		private
		dojo.removeClass(this.displayNode, this.disabled ? "dijitDisabledClickableRegion" : "dijitClickableRegion");
	},

	_onClick: function(/*Event*/ e){
		// summary:
		//		Handler for onclick event.
		// tags:
		//		private
		if(this.disabled){ return; }
		if(e){ dojo.stopEvent(e); }
		this._onMouseOut();

		// Since FF gets upset if you move a node while in an event handler for that node...
		setTimeout(dojo.hitch(this, "edit"), 0);
	},

	edit: function(){
		// summary:
		//		Display the editor widget in place of the original (read only) markup.
		// tags:
		//		private

		if(this.disabled || this.editing){ return; }
		this.editing = true;

		var editValue = 
				(this.renderAsHtml ?
				this.value :
				this.value.replace(/\s*\r?\n\s*/g,"").replace(/<br\/?>/gi,"\n").replace(/&gt;/g,">").replace(/&lt;/g,"<").replace(/&amp;/g,"&").replace(/&quot;/g,"\""));

		// Placeholder for edit widget
		// Put place holder (and eventually editWidget) before the display node so that it's positioned correctly
		// when Calendar dropdown appears, which happens automatically on focus.
		var placeholder = dojo.create("span", null, this.domNode, "before");

		var ew = this.editWidget = new dijit._InlineEditor({
			value: dojo.trim(editValue),
			autoSave: this.autoSave,
			buttonSave: this.buttonSave,
			buttonCancel: this.buttonCancel,
			renderAsHtml: this.renderAsHtml,
			editor: this.editor,
			editorParams: this.editorParams,
			sourceStyle: dojo.getComputedStyle(this.displayNode),
			save: dojo.hitch(this, "save"),
			cancel: dojo.hitch(this, "cancel"),
			width: this.width
		}, placeholder);

		// to avoid screen jitter, we first create the editor with position:absolute, visibility:hidden,
		// and then when it's finished rendering, we switch from display mode to editor
		var ews = ew.domNode.style;
		this.displayNode.style.display="none";
		ews.position = "static";
		ews.visibility = "visible";

		// Replace the display widget with edit widget, leaving them both displayed for a brief time so that
		// focus can be shifted without incident.  (browser may needs some time to render the editor.)
		this.domNode = ew.domNode;
		setTimeout(function(){
			ew.focus();
			ew._resetValue = ew.getValue();
		}, 100);
	},

	_showText: function(/*Boolean*/ focus){
		// summary:
		//		Revert to display mode, and optionally focus on display node
		// tags:
		//		private

		// display the read-only text and then quickly hide the editor (to avoid screen jitter)
		this.displayNode.style.display="";
		var ew = this.editWidget;
		var ews = ew.domNode.style;
		ews.position="absolute";
		ews.visibility="hidden";

		this.domNode = this.displayNode;

		if(focus){
			dijit.focus(this.displayNode);
		}
		ews.display = "none";
		// give the browser some time to render the display node and then shift focus to it
		// and hide the edit widget before garbage collecting the edit widget
		setTimeout(function(){
			ew.destroy();
			delete ew;
			if(dojo.isIE){
				// messing with the DOM tab order can cause IE to focus the body - so restore
				dijit.focus(dijit.getFocus());
			}
		}, 1000); // no hurry - wait for things to quiesce
	},

	save: function(/*Boolean*/ focus){
		// summary:
		//		Save the contents of the editor and revert to display mode.
		// focus: Boolean
		//		Focus on the display mode text
		// tags:
		//		private
		if(this.disabled || !this.editing){ return; }
		this.editing = false;

		var value = this.editWidget.getValue() + "";
		this.attr('value', this.renderAsHtml? value
			: value.replace(/&/gm, "&amp;").replace(/</gm, "&lt;").replace(/>/gm, "&gt;").replace(/"/gm, "&quot;").replace(/\n/g, "<br>")
		);

		// tell the world that we have changed
		this.onChange(value);

		this._showText(focus);	
	},

	setValue: function(/*String*/ val){
		// summary:
		//		Deprecated.   Use attr('value', ...) instead.
		// tags:
		//		deprecated
		dojo.deprecated("dijit.InlineEditBox.setValue() is deprecated.  Use attr('value', ...) instead.", "", "2.0");
		return this.attr("value", val);
	},
	_setValueAttr: function(/*String*/ val){
		// summary:
		// 		Hook to make attr("value", ...) work.
		//		Inserts specified HTML value into this node, or an "input needed" character if node is blank.
		this.value = val;
		this.displayNode.innerHTML = dojo.trim(val) || this.noValueIndicator;
	},

	getValue: function(){
		// summary:
		//		Deprecated.   Use attr('value') instead.
		// tags:
		//		deprecated
		dojo.deprecated("dijit.InlineEditBox.getValue() is deprecated.  Use attr('value') instead.", "", "2.0");
		return this.attr("value");
	},

	cancel: function(/*Boolean*/ focus){
		// summary:
		//		Revert to display mode, discarding any changes made in the editor
		// tags:
		//		private

		this.editing = false;
		
		// tell the world that we have no changes
		this.onCancel();
		
		this._showText(focus);
	}
});

dojo.declare(
	"dijit._InlineEditor",
	 [dijit._Widget, dijit._Templated],
{
	// summary:
	// 		Internal widget used by InlineEditBox, displayed when in editing mode
	//		to display the editor and maybe save/cancel buttons.  Calling code should
	//		connect to save/cancel methods to detect when editing is finished
	//
	//		Has mainly the same parameters as InlineEditBox, plus these values:
	//
	// style: Object
	//		Set of CSS attributes of display node, to replicate in editor
	//
	// value: String
	//		Value as an HTML string or plain text string, depending on renderAsHTML flag

	templatePath: dojo.moduleUrl("dijit", "templates/InlineEditBox.html"),
	widgetsInTemplate: true,

	postMixInProperties: function(){
		this.inherited(arguments);
		this.messages = dojo.i18n.getLocalization("dijit", "common", this.lang);
		dojo.forEach(["buttonSave", "buttonCancel"], function(prop){
			if(!this[prop]){ this[prop] = this.messages[prop]; }
		}, this);
	},

	postCreate: function(){
		// Create edit widget in place in the template
		var cls = dojo.getObject(this.editor);

		// Copy the style from the source
		// Don't copy ALL properties though, just the necessary/applicable ones
		var srcStyle = this.sourceStyle;
		var editStyle = "line-height:" + srcStyle.lineHeight + ";";
		dojo.forEach(["Weight","Family","Size","Style"], function(prop){
			editStyle += "font-"+prop+":"+srcStyle["font"+prop]+";";
		}, this);
		dojo.forEach(["marginTop","marginBottom","marginLeft", "marginRight"], function(prop){
			this.domNode.style[prop] = srcStyle[prop];
		}, this);
		if(this.width=="100%"){
			// block mode
			editStyle += "width:100%;";
			this.domNode.style.display = "block";
		}else{
			// inline-block mode
			editStyle += "width:" + (this.width + (Number(this.width)==this.width ? "px" : "")) + ";";
		}
		this.editorParams.style = editStyle;
		this.editorParams[ "displayedValue" in cls.prototype ? "displayedValue" : "value"] = this.value;
		var ew = this.editWidget = new cls(this.editorParams, this.editorPlaceholder);

		this.connect(ew, "onChange", "_onChange");

		// Monitor keypress on the edit widget.   Note that edit widgets do a stopEvent() on ESC key (to
		// prevent Dialog from closing when the user just wants to revert the value in the edit widget),
		// so this is the only way we can see the key press event.
		this.connect(ew, "onKeyPress", "_onKeyPress");
		this.connect(ew, "onKeyUp", "_onKeyPress"); // in case ESC was eaten but changed value

		if(this.autoSave){
			this.buttonContainer.style.display="none";
		}
	},

	destroy: function(){
		this.editWidget.destroy();
		this.inherited(arguments);
	},

	getValue: function(){
		// summary:
		//		Return the [display] value of the edit widget
		var ew = this.editWidget;
		return ew.attr("displayedValue" in ew ? "displayedValue" : "value");
	},

	_onKeyPress: function(e){
		// summary:
		//		Handler for keypress in the edit box (see template).
		// description:
		//		For autoSave widgets, if Esc/Enter, call cancel/save.
		//		For non-autoSave widgets, enable save button if the text value is
		//		different than the original value.
		// tags:
		//		private

		if(this._exitInProgress){
			return;
		}
		if(this.autoSave){
			if(e.altKey || e.ctrlKey){ return; }
			// If Enter/Esc pressed, treat as save/cancel.
			if(e.charOrCode == dojo.keys.ESCAPE){
				dojo.stopEvent(e);
				this._exitInProgress = true;
				this.cancel(true);
			}else if(e.charOrCode == dojo.keys.ENTER && this.editWidget.focusNode.tagName == "INPUT"){
				dojo.stopEvent(e);
				this._exitInProgress = true;
				this.save(true);
			}else if(e.charOrCode === dojo.keys.TAB){
				this._exitInProgress = true;
				// allow the TAB to change focus before we mess with the DOM: #6227
				// Expounding by request:
				// 	The current focus is on the edit widget input field.
				//	save() will hide and destroy this widget.
				//	We want the focus to jump from the currently hidden
				//	displayNode, but since it's hidden, it's impossible to
				//	unhide it, focus it, and then have the browser focus
				//	away from it to the next focusable element since each
				//	of these events is asynchronous and the focus-to-next-element
				//	is already queued.
				//	So we allow the browser time to unqueue the move-focus event 
				//	before we do all the hide/show stuff.
				setTimeout(dojo.hitch(this, "save", false), 0);
			}
		}else{
			var _this = this;
			// Delay before calling getValue().
			// The delay gives the browser a chance to update the native value.
			setTimeout(
				function(){
					_this._onChange(); // handle save button
				}, 100);
		}
	},

	_onBlur: function(){
		// summary:
		//		Called when focus moves outside the editor
		// tags:
		//		private

		this.inherited(arguments);
		if(this._exitInProgress){
			// when user clicks the "save" button, focus is shifted back to display text, causing this
			// function to be called, but in that case don't do anything
			return;
		}
		if(this.autoSave){
			this._exitInProgress = true;
			if(this.getValue() == this._resetValue){
				this.cancel(false);
			}else{
				this.save(false);
			}
		}
	},

	_onChange: function(){
		// summary:
		//		Called when the underlying widget fires an onChange event,
		//		which means that the user has finished entering the value
		// tags:
		//		private

		if(this._exitInProgress){
			// TODO: the onChange event might happen after the return key for an async widget
			// like FilteringSelect.  Shouldn't be deleting the edit widget on end-of-edit
			return;
		}
		if(this.autoSave){
			this._exitInProgress = true;
			this.save(true);
		}else{
			// in case the keypress event didn't get through (old problem with Textarea that has been fixed
			// in theory) or if the keypress event comes too quickly and the value inside the Textarea hasn't
			// been updated yet)
			this.saveButton.attr("disabled", (this.getValue() == this._resetValue) || !this.enableSave());
		}
	},
	
	enableSave: function(){
		// summary:
		//		User overridable function returning a Boolean to indicate
		// 		if the Save button should be enabled or not - usually due to invalid conditions
		// tags:
		//		extension
		return this.editWidget.isValid ? this.editWidget.isValid() : true;
	},

	focus: function(){
		// summary:
		//		Focus on the edit widget.
		this.editWidget.focus();
		dijit.selectInputText(this.editWidget.focusNode);
	}
});
