define([
	"dojo/_base/array",
	"dojo/_base/declare",
	"dojo/_base/lang",
	"dojo/dom-class",
	"dojo/dom-construct",
	"dojo/dom-style",
	"dojo/dom-attr",
	"dijit/registry",
	"dijit/_WidgetBase",
	"./iconUtils",
	"./_ItemBase",
	"./ProgressIndicator",
	"dojo/has",
	"dojo/has!dojo-bidi?dojox/mobile/bidi/ListItem"
], function(array, declare, lang, domClass, domConstruct, domStyle, domAttr, registry, WidgetBase, iconUtils, ItemBase, ProgressIndicator, has,  BidiListItem){

	// module:
	//		dojox/mobile/ListItem

	var ListItem = declare(has("dojo-bidi") ? "dojox.mobile.NonBidiListItem" : "dojox.mobile.ListItem", ItemBase, {
		// summary:
		//		An item of either RoundRectList or EdgeToEdgeList.
		// description:
		//		ListItem represents an item of either RoundRectList or
		//		EdgeToEdgeList. There are three ways to move to a different view:
		//		moveTo, href, and url. You can choose only one of them.
		//
		//		A child DOM node (or widget) can have the layout attribute,
		//		whose value is "left", "right", or "center". Such nodes will be
		//		aligned as specified.
		// example:
		// |	<li data-dojo-type="dojox.mobile.ListItem">
		// |		<div layout="left">Left Node</div>
		// |		<div layout="right">Right Node</div>
		// |		<div layout="center">Center Node</div>
		// |	</li>
		//
		//		Similarly, a child widget can have the preventTouch
		//		attribute, whose value is a boolean (or data-mobile-prevent-touch
		//		for children which are not widgets), such that touching such
		//		child doesn't trigger the item action.
		//
		//		Note that even if you specify variableHeight="true" for the list
		//		and place a tall object inside the layout node as in the example
		//		below, the layout node does not expand as you may expect,
		//		because layout node is aligned using float:left, float:right, or
		//		position:absolute.
		// example:
		// |	<li data-dojo-type="dojox.mobile.ListItem" variableHeight="true">
		// |		<div layout="left"><img src="large-picture.jpg"></div>
		// |	</li>

		// rightText: String
		//		A right-aligned text to display on the item.
		rightText: "",

		// rightIcon: String
		//		An icon to display at the right hand side of the item. The value
		//		can be either a path for an image file or a class name of a DOM
		//		button.
		rightIcon: "",

		// rightIcon2: String
		//		An icon to display at the left of the rightIcon. The value can
		//		be either a path for an image file or a class name of a DOM
		//		button.
		rightIcon2: "",

		// deleteIcon: String
		//		A delete icon to display at the left of the item. The value can
		//		be either a path for an image file or a class name of a DOM
		//		button.
		deleteIcon: "",

		// anchorLabel: Boolean
		//		If true, the label text becomes a clickable anchor text. When
		//		the user clicks on the text, the onAnchorLabelClicked handler is
		//		called. You can override or connect to the handler and implement
		//		any action. The handler has no default action.
		anchorLabel: false,

		// noArrow: Boolean
		//		If true, the right hand side arrow is not displayed.
		noArrow: false,

		// checked: Boolean
		//		If true, a check mark is displayed at the right of the item.
		checked: false,

		// arrowClass: String
		//		An icon to display as an arrow. The value can be either a path
		//		for an image file or a class name of a DOM button.
		arrowClass: "",

		// checkClass: String
		//		An icon to display as a check mark. The value can be either a
		//		path for an image file or a class name of a DOM button.
		checkClass: "",

		// uncheckClass: String
		//		An icon to display as an uncheck mark. The value can be either a
		//		path for an image file or a class name of a DOM button.
		uncheckClass: "",

		// variableHeight: Boolean
		//		If true, the height of the item varies according to its content.
		variableHeight: false,

		// rightIconTitle: String
		//		An alt text for the right icon.
		rightIconTitle: "",

		// rightIcon2Title: String
		//		An alt text for the right icon2.
		rightIcon2Title: "",

		// header: Boolean
		//		If true, this item is rendered as a category header.
		header: false,

		// tag: String
		//		A name of html tag to create as domNode.
		tag: "li",

		// busy: Boolean
		//		If true, a progress indicator spins.
		busy: false,

		// progStyle: String
		//		A css class name to add to the progress indicator.
		progStyle: "",

		// layoutOnResize: Boolean
		//		If true, a call to resize() will force computation of variable height items layout. You should not need this as in most
		//		cases ListItem height doesn't change on container resize. Depending on number and complexity
		//		of items in a view, setting to true may have a high impact on performance.
		layoutOnResize: false,

		/* internal properties */	
		// The following properties are overrides of those in _ItemBase.
		paramsToInherit: "variableHeight,transition,deleteIcon,icon,rightIcon,rightIcon2,uncheckIcon,arrowClass,checkClass,uncheckClass,deleteIconTitle,deleteIconRole",
		baseClass: "mblListItem",

		_selStartMethod: "touch",
		_selEndMethod: "timer",
		_delayedSelection: true,

		_selClass: "mblListItemSelected",

		buildRendering: function(){
			this._templated = !!this.templateString; // true if this widget is templated
			if(!this._templated){
				// Create root node if it wasn't created by _TemplatedMixin
				this.domNode = this.containerNode = this.srcNodeRef || domConstruct.create(this.tag);
			}
			this.inherited(arguments);

			if(this.selected){
				domClass.add(this.domNode, this._selClass);
			}
			if(this.header){
				domClass.replace(this.domNode, "mblEdgeToEdgeCategory", this.baseClass);
			}

			if(!this._templated){
				this.labelNode =
					domConstruct.create("div", {className:"mblListItemLabel"});
				var ref = this.srcNodeRef;
				if(ref && ref.childNodes.length === 1 && ref.firstChild.nodeType === 3){
					// if ref has only one text node, regard it as a label
					this.labelNode.appendChild(ref.firstChild);
				}
				this.domNode.appendChild(this.labelNode);
			}
			this._layoutChildren = [];
		},

		startup: function(){
			if(this._started){ return; }
			var parent = this.getParent();
			var opts = this.getTransOpts();
			// When using a template, labelNode may be created via an attach point.
			// The attach points are not yet set when ListItem.buildRendering() 
			// executes, hence the need to use them in startup().
			if((!this._templated || this.labelNode) && this.anchorLabel){
				this.labelNode.style.display = "inline"; // to narrow the text region
				this.labelNode.style.cursor = "pointer";
				this.connect(this.labelNode, "onclick", "_onClick");
				this.onTouchStart = function(e){
					return (e.target !== this.labelNode);
				};
			}

			this.inherited(arguments);
			
			if(domClass.contains(this.domNode, "mblVariableHeight")){
				this.variableHeight = true;
			}
			if(this.variableHeight){
				domClass.add(this.domNode, "mblVariableHeight");
				this.defer("layoutVariableHeight");
			}

			if(!this._isOnLine){
				this._isOnLine = true;
				this.set({ 
					// retry applying the attributes for which the custom setter delays the actual 
					// work until _isOnLine is true
					icon: this._pending_icon !== undefined ? this._pending_icon : this.icon,
					deleteIcon: this._pending_deleteIcon !== undefined ? this._pending_deleteIcon : this.deleteIcon,
					rightIcon: this._pending_rightIcon !== undefined ? this._pending_rightIcon : this.rightIcon,
					rightIcon2: this._pending_rightIcon2 !== undefined ? this._pending_rightIcon2 : this.rightIcon2,
					uncheckIcon: this._pending_uncheckIcon !== undefined ? this._pending_uncheckIcon : this.uncheckIcon 
				});
				// Not needed anymore (this code executes only once per life cycle):
				delete this._pending_icon;
				delete this._pending_deleteIcon;
				delete this._pending_rightIcon;
				delete this._pending_rightIcon2;
				delete this._pending_uncheckIcon;
			}
			if(parent && parent.select){
				// retry applying the attributes for which the custom setter delays the actual 
				// work until _isOnLine is true. 
				this.set("checked", this._pendingChecked !== undefined ? this._pendingChecked : this.checked);
				domAttr.set(this.domNode, "role", "option");
				if(this._pendingChecked || this.checked){
					domAttr.set(this.domNode, "aria-selected", "true");
				}
				// Not needed anymore (this code executes only once per life cycle):
				delete this._pendingChecked; 
			}
			this.setArrow();
			this.layoutChildren();
		},

		_updateHandles: function(){
			// tags:
			//		private
			var parent = this.getParent();
			var opts = this.getTransOpts();
			if(opts.moveTo || opts.href || opts.url || this.clickable || (parent && parent.select)){
				if(!this._keydownHandle){
					this._keydownHandle = this.connect(this.domNode, "onkeydown", "_onClick"); // for desktop browsers
				}
				this._handleClick = true;
			}else{
				if(this._keydownHandle){
					this.disconnect(this._keydownHandle);
					this._keydownHandle = null;
				}
				this._handleClick = false;
			}
			this.inherited(arguments);
		},

		layoutChildren: function(){
			var centerNode;
			array.forEach(this.domNode.childNodes, function(n){
				if(n.nodeType !== 1){ return; }
				var layout = n.getAttribute("layout") || // TODO: Remove the non-HTML5-compliant attribute in 2.0
					n.getAttribute("data-mobile-layout") || 
					(registry.byNode(n) || {}).layout;
				if(layout){ 
					domClass.add(n, "mblListItemLayout" +
						layout.charAt(0).toUpperCase() + layout.substring(1));
					this._layoutChildren.push(n);
					if(layout === "center"){ centerNode = n; }
				}
			}, this);
			if(centerNode){
				this.domNode.insertBefore(centerNode, this.domNode.firstChild);
			}
		},

		resize: function(){
			if(this.layoutOnResize && this.variableHeight){
				this.layoutVariableHeight();
			}
			// labelNode may not exist only when using a template (if not created by an attach point)
			if(!this._templated || this.labelNode){
				// If labelNode is empty, shrink it so as not to prevent user clicks.
				this.labelNode.style.display = this.labelNode.firstChild ? "block" : "inline";
			}
		},

		_onTouchStart: function(e){
			// tags:
			//		private
			if(e.target.getAttribute("preventTouch") || // TODO: Remove the non-HTML5-compliant attribute in 2.0
				e.target.getAttribute("data-mobile-prevent-touch") ||
				(registry.getEnclosingWidget(e.target) || {}).preventTouch){
				return;
			}
			this.inherited(arguments);
		},

		_onClick: function(e){
			// summary:
			//		Internal handler for click events.
			// tags:
			//		private
			if(this.getParent().isEditing || e && e.type === "keydown" && e.keyCode !== 13){ return; }
			if(this.onClick(e) === false){ return; } // user's click action
			var n = this.labelNode;
			// labelNode may not exist only when using a template 
			if((this._templated || n) && this.anchorLabel && e.currentTarget === n){
				domClass.add(n, "mblListItemLabelSelected");
				this.defer(function(){
					domClass.remove(n, "mblListItemLabelSelected");
				}, this._duration);
				this.onAnchorLabelClicked(e);
				return;
			}
			var parent = this.getParent();
			if(parent.select){
				if(parent.select === "single"){
					if(!this.checked){
						this.set("checked", true);
					}
				}else if(parent.select === "multiple"){
					this.set("checked", !this.checked);
				}
			}
			this.defaultClickAction(e);
		},

		onClick: function(/*Event*/ /*===== e =====*/){
			// summary:
			//		User-defined function to handle clicks.
			// tags:
			//		callback
		},

		onAnchorLabelClicked: function(e){
			// summary:
			//		Stub function to connect to from your application.
		},

		layoutVariableHeight: function(){
			// summary:
			//		Lays out the current item with variable height.
			var h = this.domNode.offsetHeight;
			if(h === this.domNodeHeight){ return; }
			this.domNodeHeight = h;
			array.forEach(this._layoutChildren.concat([
				this.rightTextNode,
				this.rightIcon2Node,
				this.rightIconNode,
				this.uncheckIconNode,
				this.iconNode,
				this.deleteIconNode,
				this.knobIconNode
			]), function(n){
				if(n){
					var domNode = this.domNode;
					var f = function(){
						var t = Math.round((domNode.offsetHeight - n.offsetHeight) / 2) -
							domStyle.get(domNode, "paddingTop");
						n.style.marginTop = t + "px";
					};
					if(n.offsetHeight === 0 && n.tagName === "IMG"){
						n.onload = f;
					}else{
						f();
					}
				}
			}, this);
		},

		setArrow: function(){
			// summary:
			//		Sets the arrow icon if necessary.
			if(this.checked){ return; }
			var c = "";
			var parent = this.getParent();
			var opts = this.getTransOpts();
			if(opts.moveTo || opts.href || opts.url || this.clickable){
				if(!this.noArrow && !(parent && parent.selectOne)){
					c = this.arrowClass || "mblDomButtonArrow";
					domAttr.set(this.domNode, "role", "button");
				}
			}
			if(c){
				this._setRightIconAttr(c);
			}
		},

		_findRef: function(/*String*/type){
			// summary:
			//		Find an appropriate position to insert a new child node.
			// tags:
			//		private
			var i, node, list = ["deleteIcon", "icon", "rightIcon", "uncheckIcon", "rightIcon2", "rightText"];
			for(i = array.indexOf(list, type) + 1; i < list.length; i++){
				node = this[list[i] + "Node"];
				if(node){ return node; }
			}
			for(i = list.length - 1; i >= 0; i--){
				node = this[list[i] + "Node"];
				if(node){ return node.nextSibling; }
			}
			return this.domNode.firstChild;
		},
		
		_setIcon: function(/*String*/icon, /*String*/type){
			// tags:
			//		private
			if(!this._isOnLine){
				// record the value to be able to reapply it (see the code in the startup method)
				this["_pending_" + type] = icon;
				return; 
			} // icon may be invalid because inheritParams is not called yet
			this._set(type, icon);
			this[type + "Node"] = iconUtils.setIcon(icon, this[type + "Pos"],
				this[type + "Node"], this[type + "Title"] || this.alt, this.domNode, this._findRef(type), "before");
			if(this[type + "Node"]){
				var cap = type.charAt(0).toUpperCase() + type.substring(1);
				domClass.add(this[type + "Node"], "mblListItem" + cap);
			}
			var role = this[type + "Role"];
			if(role){
				this[type + "Node"].setAttribute("role", role);
			}
		},

		_setDeleteIconAttr: function(/*String*/icon){
			// tags:
			//		private
			this._setIcon(icon, "deleteIcon");
		},

		_setIconAttr: function(icon){
			// tags:
			//		private
			this._setIcon(icon, "icon");
		},

		_setRightTextAttr: function(/*String*/text){
			// tags:
			//		private
			if(!this._templated && !this.rightTextNode){
				// When using a template, let the template create the element.
				this.rightTextNode = domConstruct.create("div", {className:"mblListItemRightText"}, this.labelNode, "before");
			}
			this.rightText = text;
			this.rightTextNode.innerHTML = this._cv ? this._cv(text) : text;
		},

		_setRightIconAttr: function(/*String*/icon){
			// tags:
			//		private
			this._setIcon(icon, "rightIcon");
		},

		_setUncheckIconAttr: function(/*String*/icon){
			// tags:
			//		private
			this._setIcon(icon, "uncheckIcon");
		},

		_setRightIcon2Attr: function(/*String*/icon){
			// tags:
			//		private
			this._setIcon(icon, "rightIcon2");
		},

		_setCheckedAttr: function(/*Boolean*/checked){
			// tags:
			//		private
			if(!this._isOnLine){
				// record the value to be able to reapply it (see the code in the startup method)
				this._pendingChecked = checked; 
				return; 
			} // icon may be invalid because inheritParams is not called yet
			var parent = this.getParent();
			if(parent && parent.select === "single" && checked){
				array.forEach(parent.getChildren(), function(child){
					child !== this && child.checked && child.set("checked", false) && domAttr.set(child.domNode, "aria-selected", "false");
				}, this);
			}
			this._setRightIconAttr(this.checkClass || "mblDomButtonCheck");
			this._setUncheckIconAttr(this.uncheckClass);

			domClass.toggle(this.domNode, "mblListItemChecked", checked);
			domClass.toggle(this.domNode, "mblListItemUnchecked", !checked);
			domClass.toggle(this.domNode, "mblListItemHasUncheck", !!this.uncheckIconNode);
			this.rightIconNode.style.position = (this.uncheckIconNode && !checked) ? "absolute" : "";

			if(parent && this.checked !== checked){
				parent.onCheckStateChanged(this, checked);
			}
			this._set("checked", checked);
			domAttr.set(this.domNode, "aria-selected", checked ? "true" : "false");
		},

		_setBusyAttr: function(/*Boolean*/busy){
			// tags:
			//		private
			var prog = this._prog;
			if(busy){
				if(!this._progNode){
					this._progNode = domConstruct.create("div", {className:"mblListItemIcon"});
					prog = this._prog = new ProgressIndicator({size:25, center:false, removeOnStop:false});
					domClass.add(prog.domNode, this.progStyle);
					this._progNode.appendChild(prog.domNode);
				}
				if(this.iconNode){
					this.domNode.replaceChild(this._progNode, this.iconNode);
				}else{
					domConstruct.place(this._progNode, this._findRef("icon"), "before");
				}
				prog.start();
			}else if(this._progNode){
				if(this.iconNode){
					this.domNode.replaceChild(this.iconNode, this._progNode);
				}else{
					this.domNode.removeChild(this._progNode);
				}
				prog.stop();
			}
			this._set("busy", busy);
		},

		_setSelectedAttr: function(/*Boolean*/selected){
			// summary:
			//		Makes this widget in the selected or unselected state.
			// tags:
			//		private
			this.inherited(arguments);
			domClass.toggle(this.domNode, this._selClass, selected);
		},
		
		_setClickableAttr: function(/*Boolean*/clickable){
			// tags:
			//		private
			this._set("clickable", clickable);
			this._updateHandles();
		},
		
		_setMoveToAttr: function(/*String*/moveTo){
			// tags:
			//		private
			this._set("moveTo", moveTo);
			this._updateHandles();
		},
		
		_setHrefAttr: function(/*String*/href){
			// tags:
			//		private
			this._set("href", href);
			this._updateHandles();
		},
		
		_setUrlAttr: function(/*String*/url){
			// tags:
			//		private
			this._set("url", url);
			this._updateHandles();
		}
	});
	
	ListItem.ChildWidgetProperties = {
		// summary:
		//		These properties can be specified for the children of a dojox/mobile/ListItem.

		// layout: String
		//		Specifies the position of the ListItem child ("left", "center" or "right").
		layout: "",

		// preventTouch: Boolean
		//		Disables touch events on the ListItem child.
		preventTouch: false
	};
	
	// Since any widget can be specified as a ListItem child, mix ChildWidgetProperties
	// into the base widget class.  (This is a hack, but it's effective.)
	// This is for the benefit of the parser.   Remove for 2.0.  Also, hide from doc viewer.
	lang.extend(WidgetBase, /*===== {} || =====*/ ListItem.ChildWidgetProperties);

	return has("dojo-bidi") ? declare("dojox.mobile.ListItem", [ListItem, BidiListItem]) : ListItem;	
});
