define([
	"dojo/_base/array",
	"dojo/_base/config",
	"dojo/_base/connect",
	"dojo/_base/lang",
	"dojo/_base/window",
	"dojo/_base/kernel",
	"dojo/dom",
	"dojo/dom-class",
	"dojo/dom-construct",
	"dojo/domReady",
	"dojo/ready",
	"dojo/touch",
	"dijit/registry",
	"./sniff",
	"./uacss" // (no direct references)
], function(array, config, connect, lang, win, kernel, dom, domClass, domConstruct, domReady, ready, touch, registry, has){

	// module:
	//		dojox/mobile/common

	var dm = lang.getObject("dojox.mobile", true);

	// tell dojo/touch to generate synthetic clicks immediately
	// and regardless of preventDefault() calls on touch events
	win.doc.dojoClick = true;
	/// ... but let user disable this by removing dojoClick from the document
	if(has("touch")){
		// Do we need to send synthetic clicks when preventDefault() is called on touch events?
		// This is normally true on anything except Android 4.1+ and IE10+, but users reported
		// exceptions like Galaxy Note 2. So let's use a has("clicks-prevented") flag, and let
		// applications override it through data-dojo-config="has:{'clicks-prevented':true}" if needed.
		has.add("clicks-prevented", !(has("android") >= 4.1 || (has("ie") === 10) || (!has("ie") && has("trident") > 6)));
		if(has("clicks-prevented")){
			dm._sendClick = function(target, e){
				// dojo/touch will send a click if dojoClick is set, so don't do it again.
				for(var node = target; node; node = node.parentNode){
					if(node.dojoClick){
						return;
					}
				}
				var ev = win.doc.createEvent("MouseEvents"); 
				ev.initMouseEvent("click", true, true, win.global, 1, e.screenX, e.screenY, e.clientX, e.clientY); 
				target.dispatchEvent(ev);
			};
		}
	}

	dm.getScreenSize = function(){
		// summary:
		//		Returns the dimensions of the browser window.
		return {
			h: win.global.innerHeight || win.doc.documentElement.clientHeight,
			w: win.global.innerWidth || win.doc.documentElement.clientWidth
		};
	};

	dm.updateOrient = function(){
		// summary:
		//		Updates the orientation specific CSS classes, 'dj_portrait' and
		//		'dj_landscape'.
		var dim = dm.getScreenSize();
		domClass.replace(win.doc.documentElement,
				  dim.h > dim.w ? "dj_portrait" : "dj_landscape",
				  dim.h > dim.w ? "dj_landscape" : "dj_portrait");
	};
	dm.updateOrient();

	dm.tabletSize = 500;
	dm.detectScreenSize = function(/*Boolean?*/force){
		// summary:
		//		Detects the screen size and determines if the screen is like
		//		phone or like tablet. If the result is changed,
		//		it sets either of the following css class to `<html>`:
		//
		//		- 'dj_phone'
		//		- 'dj_tablet'
		//
		//		and it publishes either of the following events:
		//
		//		- '/dojox/mobile/screenSize/phone'
		//		- '/dojox/mobile/screenSize/tablet'

		var dim = dm.getScreenSize();
		var sz = Math.min(dim.w, dim.h);
		var from, to;
		if(sz >= dm.tabletSize && (force || (!this._sz || this._sz < dm.tabletSize))){
			from = "phone";
			to = "tablet";
		}else if(sz < dm.tabletSize && (force || (!this._sz || this._sz >= dm.tabletSize))){
			from = "tablet";
			to = "phone";
		}
		if(to){
			domClass.replace(win.doc.documentElement, "dj_"+to, "dj_"+from);
			connect.publish("/dojox/mobile/screenSize/"+to, [dim]);
		}
		this._sz = sz;
	};
	dm.detectScreenSize();

	// dojox/mobile.hideAddressBarWait: Number
	//		The time in milliseconds to wait before the fail-safe hiding address
	//		bar runs. The value must be larger than 800.
	dm.hideAddressBarWait = typeof(config.mblHideAddressBarWait) === "number" ?
		config.mblHideAddressBarWait : 1500;

	dm.hide_1 = function(){
		// summary:
		//		Internal function to hide the address bar.
		// tags:
		//		private
		scrollTo(0, 1);
		dm._hidingTimer = (dm._hidingTimer == 0) ? 200 : dm._hidingTimer * 2;
		setTimeout(function(){ // wait for a while for "scrollTo" to finish
			if(dm.isAddressBarHidden() || dm._hidingTimer > dm.hideAddressBarWait){
				// Succeeded to hide address bar, or failed but timed out 
				dm.resizeAll();
				dm._hiding = false;
			}else{
				// Failed to hide address bar, so retry after a while
				setTimeout(dm.hide_1, dm._hidingTimer);
			}
		}, 50); //50ms is an experiential value
	};

	dm.hideAddressBar = function(/*Event?*/evt){
		// summary:
		//		Hides the address bar.
		// description:
		//		Tries to hide the address bar a couple of times. The purpose is to do 
		//		it as quick as possible while ensuring the resize is done after the hiding
		//		finishes.
		if(dm.disableHideAddressBar || dm._hiding){ return; }
		dm._hiding = true;
		dm._hidingTimer = has("ios") ? 200 : 0; // Need to wait longer in case of iPhone
		var minH = screen.availHeight;
		if(has('android')){
			minH = outerHeight / devicePixelRatio;
			// On some Android devices such as Galaxy SII, minH might be 0 at this time.
			// In that case, retry again after a while. (200ms is an experiential value)
			if(minH == 0){
				dm._hiding = false;
				setTimeout(function(){ dm.hideAddressBar(); }, 200);
			}
			// On some Android devices such as HTC EVO, "outerHeight/devicePixelRatio"
			// is too short to hide address bar, so make it high enough
			if(minH <= innerHeight){ minH = outerHeight; }
			// On Android 2.2/2.3, hiding address bar fails when "overflow:hidden" style is
			// applied to html/body element, so force "overflow:visible" style
			if(has('android') < 3){
				win.doc.documentElement.style.overflow = win.body().style.overflow = "visible";
			}
		}
		if(win.body().offsetHeight < minH){ // to ensure enough height for scrollTo to work
			win.body().style.minHeight = minH + "px";
			dm._resetMinHeight = true;
		}
		setTimeout(dm.hide_1, dm._hidingTimer);
	};

	dm.isAddressBarHidden = function(){
		return pageYOffset === 1;
	};

	dm.resizeAll = function(/*Event?*/evt, /*Widget?*/root){
		// summary:
		//		Calls the resize() method of all the top level resizable widgets.
		// description:
		//		Finds all widgets that do not have a parent or the parent does not
		//		have the resize() method, and calls resize() for them.
		//		If a widget has a parent that has resize(), calling widget's
		//		resize() is its parent's responsibility.
		// evt:
		//		Native event object
		// root:
		//		If specified, searches the specified widget recursively for top-level
		//		resizable widgets.
		//		root.resize() is always called regardless of whether root is a
		//		top level widget or not.
		//		If omitted, searches the entire page.
		if(dm.disableResizeAll){ return; }
		connect.publish("/dojox/mobile/resizeAll", [evt, root]); // back compat
		connect.publish("/dojox/mobile/beforeResizeAll", [evt, root]);
		if(dm._resetMinHeight){
			win.body().style.minHeight = dm.getScreenSize().h + "px";
		} 
		dm.updateOrient();
		dm.detectScreenSize();
		var isTopLevel = function(w){
			var parent = w.getParent && w.getParent();
			return !!((!parent || !parent.resize) && w.resize);
		};
		var resizeRecursively = function(w){
			array.forEach(w.getChildren(), function(child){
				if(isTopLevel(child)){ child.resize(); }
				resizeRecursively(child);
			});
		};
		if(root){
			if(root.resize){ root.resize(); }
			resizeRecursively(root);
		}else{
			array.forEach(array.filter(registry.toArray(), isTopLevel),
					function(w){ w.resize(); });
		}
		connect.publish("/dojox/mobile/afterResizeAll", [evt, root]);
	};

	dm.openWindow = function(url, target){
		// summary:
		//		Opens a new browser window with the given URL.
		win.global.open(url, target || "_blank");
	};

	dm._detectWindowsTheme = function(){
		// summary:
		//		Detects if the "windows" theme is used,
		//		if it is used, set has("windows-theme") and
		//		add the .windows_theme class on the document.
		
		// Avoid unwanted (un)zoom on some WP8 devices (at least Nokia Lumia 920) 
		if(navigator.userAgent.match(/IEMobile\/10\.0/)){
			domConstruct.create("style", 
				{innerHTML: "@-ms-viewport {width: auto !important}"}, win.doc.head);
		}

		var setWindowsTheme = function(){
			domClass.add(win.doc.documentElement, "windows_theme");
			kernel.experimental("Dojo Mobile Windows theme", "Behavior and appearance of the Windows theme are experimental.");
		};

		// First see if the "windows-theme" feature has already been set explicitly
		// in that case skip aut-detect
		var windows = has("windows-theme");
		if(windows !== undefined){
			if(windows){
				setWindowsTheme();
			}
			return;
		}

		// check css
		var i, j;

		var check = function(href){
			// TODO: find a better regexp to match?
			if(href && href.indexOf("/windows/") !== -1){
				has.add("windows-theme", true);
				setWindowsTheme();
				return true;
			}
			return false;
		};

		// collect @import
		var s = win.doc.styleSheets;
		for(i = 0; i < s.length; i++){
			if(s[i].href){ continue; }
			var r = s[i].cssRules || s[i].imports;
			if(!r){ continue; }
			for(j = 0; j < r.length; j++){
				if(check(r[j].href)){
					return;
				}
			}
		}

		// collect <link>
		var elems = win.doc.getElementsByTagName("link");
		for(i = 0; i < elems.length; i++){
			if(check(elems[i].href)){
				return;
			}
		}
	};

	if(config.mblApplyPageStyles !== false){
		domClass.add(win.doc.documentElement, "mobile");
	}
	if(has('chrome')){
		// dojox/mobile does not load uacss (only _compat does), but we need dj_chrome.
		domClass.add(win.doc.documentElement, "dj_chrome");
	}

	if(win.global._no_dojo_dm){
		// deviceTheme seems to be loaded from a script tag (= non-dojo usage)
		var _dm = win.global._no_dojo_dm;
		for(var i in _dm){
			dm[i] = _dm[i];
		}
		dm.deviceTheme.setDm(dm);
	}

	// flag for Android transition animation flicker workaround
	has.add('mblAndroidWorkaround', 
			config.mblAndroidWorkaround !== false && has('android') < 3, undefined, true);
	has.add('mblAndroid3Workaround', 
			config.mblAndroid3Workaround !== false && has('android') >= 3, undefined, true);

	dm._detectWindowsTheme();

	dm.setSelectable = function(/*Node*/node, /*Boolean*/selectable){
		var nodes, i;
		node = dom.byId(node);
		if (has("ie") <= 9){
			// (IE < 10) Fall back to setting/removing the
			// unselectable attribute on the element and all its children
			// except the input element (see https://bugs.dojotoolkit.org/ticket/13846)
			nodes = node.getElementsByTagName("*");
			i = nodes.length;
			if(selectable){
				node.removeAttribute("unselectable");
				while(i--){
					nodes[i].removeAttribute("unselectable");
				}
			}else{
				node.setAttribute("unselectable", "on");
				while(i--){
					if (nodes[i].tagName !== "INPUT"){
						nodes[i].setAttribute("unselectable", "on");
					}
				}
			}
		}else{
			domClass.toggle(node, "unselectable", !selectable);
		}
	};

	// Set the background style using dojo/domReady, not dojo/ready, to ensure it is already
	// set at widget initialization time. (#17418) 
	domReady(function(){
		domClass.add(win.body(), "mblBackground");
	});

	ready(function(){
		dm.detectScreenSize(true);
		if(config.mblAndroidWorkaroundButtonStyle !== false && has('android')){
			// workaround for the form button disappearing issue on Android 2.2-4.0
			domConstruct.create("style", {innerHTML:"BUTTON,INPUT[type='button'],INPUT[type='submit'],INPUT[type='reset'],INPUT[type='file']::-webkit-file-upload-button{-webkit-appearance:none;} audio::-webkit-media-controls-play-button,video::-webkit-media-controls-play-button{-webkit-appearance:media-play-button;} video::-webkit-media-controls-fullscreen-button{-webkit-appearance:media-fullscreen-button;}"}, win.doc.head, "first");
		}
		if(has('mblAndroidWorkaround')){
			// add a css class to show view offscreen for android flicker workaround
			domConstruct.create("style", {innerHTML:".mblView.mblAndroidWorkaround{position:absolute;top:-9999px !important;left:-9999px !important;}"}, win.doc.head, "last");
		}

		var f = dm.resizeAll;
		// Address bar hiding
		var isHidingPossible =
			navigator.appVersion.indexOf("Mobile") != -1 && // only mobile browsers
			// #17455: hiding Safari's address bar works in iOS < 7 but this is 
			// no longer possible since iOS 7. Hence, exclude iOS 7 and later: 
			!(has("ios") >= 7);
		// You can disable the hiding of the address bar with the following dojoConfig:
		// var dojoConfig = { mblHideAddressBar: false };
		// If unspecified, the flag defaults to true.
		if((config.mblHideAddressBar !== false && isHidingPossible) ||
			config.mblForceHideAddressBar === true){
			dm.hideAddressBar();
			if(config.mblAlwaysHideAddressBar === true){
				f = dm.hideAddressBar;
			}
		}

		var ios6 = has("ios") >= 6; // Full-screen support for iOS6 or later
		if((has('android') || ios6) && win.global.onorientationchange !== undefined){
			var _f = f;
			var curSize, curClientWidth, curClientHeight;
			if(ios6){
				curClientWidth = win.doc.documentElement.clientWidth;
				curClientHeight = win.doc.documentElement.clientHeight;
			}else{ // Android
				// Call resize for the first resize event after orientationchange
				// because the size information may not yet be up to date when the 
				// event orientationchange occurs.
				f = function(evt){
					var _conn = connect.connect(null, "onresize", null, function(e){
						connect.disconnect(_conn);
						_f(e);
					});
				};
				curSize = dm.getScreenSize();
			};
			// Android: Watch for resize events when the virtual keyboard is shown/hidden.
			// The heuristic to detect this is that the screen width does not change
			// and the height changes by more than 100 pixels.
			//
			// iOS >= 6: Watch for resize events when entering or existing the new iOS6 
			// full-screen mode. The heuristic to detect this is that clientWidth does not
			// change while the clientHeight does change.
			connect.connect(null, "onresize", null, function(e){
				if(ios6){
					var newClientWidth = win.doc.documentElement.clientWidth,
						newClientHeight = win.doc.documentElement.clientHeight;
					if(newClientWidth == curClientWidth && newClientHeight != curClientHeight){
						// full-screen mode has been entered/exited (iOS6)
						_f(e);
					}
					curClientWidth = newClientWidth;
					curClientHeight = newClientHeight;
				}else{ // Android
					var newSize = dm.getScreenSize();
					if(newSize.w == curSize.w && Math.abs(newSize.h - curSize.h) >= 100){
						// keyboard has been shown/hidden (Android)
						_f(e);
					}
					curSize = newSize;
				}
			});
		}
		
		connect.connect(null, win.global.onorientationchange !== undefined
			? "onorientationchange" : "onresize", null, f);
		win.body().style.visibility = "visible";
	});

	// TODO: return functions declared above in this hash, rather than
	// dojox.mobile.

	/*=====
	return {
		// summary:
		//		A common module for dojox/mobile.
		// description:
		//		This module includes common utility functions that are used by
		//		dojox/mobile widgets. Also, it provides functions that are commonly
		//		necessary for mobile web applications, such as the hide address bar
		//		function.
	};
	=====*/
	return dm;
});
