void UpdateUserType (NSObjectTypeInfo type)
		{
			if (userClasses.Add (type.ObjCName))
				xcodeProjectDirty = true;
			
			FilePath target = outputDir.Combine (type.ObjCName + ".h");
			if (File.Exists (target) && File.GetLastWriteTime (target) >= type.DefinedIn.Max (f => File.GetLastWriteTime (f)))
				return;
			
			if (!Directory.Exists (outputDir))
				Directory.CreateDirectory (outputDir);
			
			typeTracker.GenerateObjcType (type, outputDir);
		}

		NSObjectTypeInfo ConvertType (ProjectDom dom, IType type)
		{
			string objcName = null;
			bool isModel = false;
			bool registeredInDesigner = true;
			
			foreach (var part in type.Parts) {
				foreach (var att in part.Attributes) {
					if (att.AttributeType.FullName == registerAttType.FullName) {
						if (type.SourceProject != null) {
							registeredInDesigner &=
								MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (part.CompilationUnit.FileName);
						}
						
						//type registered with an explicit type name are up to the user to provide a valid name
						// Note that the attribute now takes one *or* two parameters.
						if (att.PositionalArguments.Count == 1 || att.PositionalArguments.Count == 2)
							objcName = (string)((System.CodeDom.CodePrimitiveExpression)att.PositionalArguments[0]).Value;
						//non-nested types in the root namespace have names accessible from obj-c
						else if (string.IsNullOrEmpty (type.Namespace) && type.Name.IndexOf ('.') < 0)
							objcName = type.Name;
					}
					
					if (att.AttributeType.FullName == modelAttType.FullName) {
						isModel = true;
					}
				}
			}
			
			if (string.IsNullOrEmpty (objcName))
				return null;
			
			var info = new NSObjectTypeInfo (objcName, type.FullName, null, type.BaseType.FullName, isModel,
				type.SourceProject != null, registeredInDesigner);
			
			if (info.IsUserType) {
				UpdateTypeMembers (dom, info, type);
				info.DefinedIn = type.Parts.Select (p => (string) p.CompilationUnit.FileName).ToArray ();
			}
			
			return info;
		}

		public static NSObjectTypeInfo ParseHeader (string headerFile)
		{
			string text = File.ReadAllText (headerFile);
			string userType = null, userBaseType = null;
			MatchCollection matches;
			NSObjectTypeInfo type;
			
			// First, grep for classes
			matches = typeInfoRegex.Matches (text);
			foreach (Match match in matches) {
				if (match.Groups[1].Value != "interface")
					continue;
				
				if (userType != null) {
					// UNSUPPORTED: more than 1 user-type defined in this header
					return null;
				}
				
				userType = match.Groups[2].Value;
				userBaseType = match.Groups[3].Value;
			}
			
			if (userType == null)
				return null;
			
			type = new NSObjectTypeInfo (userType, null, userBaseType, null, false, true, true);
			
			// Now grep for IBActions and IBOutlets
			matches = ibRegex.Matches (text);
			foreach (Match match in matches) {
				var kind = match.Groups[1].Value;
				var def = match.Groups[2].Value;
				if (kind == "IBOutlet") {
					var split = def.Split (whitespaceChars, StringSplitOptions.RemoveEmptyEntries);
					if (split.Length != 2)
						continue;
					string objcName = split[1].TrimStart ('*');
					string objcType = split[0].TrimEnd ('*');
					if (objcType == "id")
						objcType = "NSObject";
					if (string.IsNullOrEmpty (objcType)) {
						MessageService.ShowError (GettextCatalog.GetString ("Error while parsing header file."),
							string.Format (GettextCatalog.GetString ("The definition '{0}' can't be parsed."), def));
						objcType = "NSObject";
					}
					
					IBOutlet outlet = new IBOutlet (objcName, objcName, objcType, null);
					outlet.IsDesigner = true;
					
					type.Outlets.Add (outlet);
				} else {
					string[] split = def.Split (colonChar);
					string name = split[0].Trim ();
					var action = new IBAction (name, name);
					action.IsDesigner = true;
					
					string label = null;
					for (int i = 1; i < split.Length; i++) {
						var s = split[i].Split (splitActionParamsChars, StringSplitOptions.RemoveEmptyEntries);
						string objcType = s[0];
						if (objcType == "id")
							objcType = "NSObject";
						var par = new IBActionParameter (label, s[1], objcType, null);
						label = s.Length == 3? s[2] : null;
						action.Parameters.Add (par);
					}
					
					type.Actions.Add (action);
				}
			}
			
			return type;
		}

		bool TryResolveCliToObjc (string cliType, out NSObjectTypeInfo resolved)
		{
			if (cliTypes.TryGetValue (cliType, out resolved))
				return true;
			if (refCliTypes.TryGetValue (cliType, out resolved))
				return true;
			resolved = null;
			return false;
		}

		/// <summary>
		/// Resolves the Objective-C types by mapping the known .NET type information.
		/// </summary>
		/// <param name='type'>
		/// An NSObjectTypeInfo with the .NET type information filled in.
		/// </param>
		public void ResolveCliToObjc (NSObjectTypeInfo type)
		{
			NSObjectTypeInfo resolved;
			
			if (type.BaseObjCType == null && type.BaseCliType != null) {
				if (TryResolveCliToObjc (type.BaseCliType, out resolved)) {
					if (resolved.IsModel)
						type.BaseIsModel = true;
					type.BaseObjCType = resolved.ObjCName;
					//FIXME: handle type references better
					if (resolved.IsUserType)
						type.UserTypeReferences.Add (resolved.ObjCName);
				} else {
					//managed classes many have implicitly registered base classes with a name not
					//expressible in obj-c. In this case, the best we can do is walk down the 
					//hierarchy until we find a valid base class
					var reference = ReflectionHelper.ParseReflectionName (type.BaseCliType);
					var baseCliType = reference.Resolve (dom.Compilation);
					foreach (var bt in baseCliType.GetAllBaseTypeDefinitions ()) {
						if (bt.Kind != TypeKind.Class) 
							continue;
						
						if (TryResolveCliToObjc (bt.ReflectionName, out resolved)) {
							if (resolved.IsModel)
								type.BaseIsModel = true;
							type.BaseObjCType = resolved.ObjCName;
							if (resolved.IsUserType)
								type.UserTypeReferences.Add (resolved.ObjCName);
							break;
						}
					}
				}
			}
			
			foreach (var outlet in type.Outlets) {
				if (outlet.ObjCType != null)
					continue;
				
				if (TryResolveCliToObjc (outlet.CliType, out resolved)) {
					outlet.ObjCType = resolved.ObjCName;
					if (resolved.IsUserType)
						type.UserTypeReferences.Add (resolved.ObjCName);
				}
			}
			
			foreach (var action in type.Actions) {
				foreach (var param in action.Parameters) {
					if (param.ObjCType != null)
						continue;
					
					if (TryResolveCliToObjc (param.CliType, out resolved)) {
						param.ObjCType = resolved.ObjCName;
						if (resolved.IsUserType)
							type.UserTypeReferences.Add (resolved.ObjCName);
					}
				}
			}
		}

		bool TryResolveCliToObjc (string cliType, out NSObjectTypeInfo resolved)
		{
			if (cliTypes.TryGetValue (cliType, out resolved))
				return true;
			foreach (var r in dom.References) {
				var rDom = infoService.GetProjectInfo (r);
				if (rDom != null && rDom.cliTypes.TryGetValue (cliType, out resolved))
					return true;
			}
			resolved = null;
			return false;
		}

		/// <summary>
		/// Resolves the type by mapping the known Objective-C type information to .NET types.
		/// </summary>
		/// <returns>
		/// The number of unresolved types still remaining.
		/// </returns>
		/// <param name='type'>
		/// The NSObjectTypeInfo that contains the known Objective-C type information.
		/// Typically this will be the result of NSObjectInfoService.ParseHeader().
		/// </param>
		/// <param name='provider'>
		/// A CodeDom provider which is used to make sure type names don't conflict with language keywords.
		/// </param>
		/// <param name='defaultNamespace'>
		/// The default namespace used when forcing type resolution.
		/// </param>
		public void ResolveObjcToCli (IProgressMonitor monitor, NSObjectTypeInfo type, CodeDomProvider provider, string defaultNamespace)
		{
			NSObjectTypeInfo resolved;
			
			// Resolve our base type
			if (type.BaseCliType == null) {
				if (TryResolveObjcToCli (type.BaseObjCType, out resolved)) {
					type.BaseCliType = resolved.CliName;
				} else  {
					type.BaseCliType = defaultNamespace + "." + provider.CreateValidIdentifier (type.BaseObjCType);
					monitor.ReportWarning (string.Format ("Failed to resolve Objective-C type {0} to CLI type on type {1}",
						type.BaseObjCType, type.ObjCName));
				}
			}
			
			// Resolve [Outlet] types
			foreach (var outlet in type.Outlets) {
				if (outlet.CliType != null)
					continue;
				
				if (TryResolveObjcToCli (outlet.ObjCType, out resolved)) {
					outlet.CliType = resolved.CliName;
				} else {
					outlet.CliType = defaultNamespace + "." + provider.CreateValidIdentifier (outlet.ObjCType);
					monitor.ReportWarning (string.Format ("Failed to resolve Objective-C type {0} to CLI type on outlet {1} on type {2}",
						outlet.ObjCType, outlet.ObjCName, type.ObjCName));
				}
			}
			
			// Resolve [Action] param types
			foreach (var action in type.Actions) {
				foreach (var param in action.Parameters) {
					if (param.CliType != null)
						continue;
					
					if (TryResolveObjcToCli (param.ObjCType, out resolved)) {
						param.CliType = resolved.CliName;
					} else {
						param.CliType = defaultNamespace + "." + provider.CreateValidIdentifier (param.ObjCType);
						monitor.ReportWarning (string.Format ("Failed to resolve Objective-C type {0} to CLI type on action parameter {1} for action {2} on type {3}",
							param.ObjCType, param.Name, action.ObjCName, type.ObjCName));
					}
				}
			}
		}

		void UpdateTypeMembers (TypeSystemService.ProjectContentWrapper dom, NSObjectTypeInfo info, ITypeDefinition type)
		{
			info.Actions.Clear ();
			info.Outlets.Clear ();
			foreach (var prop in type.Properties) {
				foreach (var att in prop.Attributes) {
					var attType = att.AttributeType;
					bool isIBOutlet = attType.Equals (Resolve (dom, iboutletAttType));
					if (!isIBOutlet) {
						if (!attType.Equals (Resolve (dom, connectAttType)))
							continue;
					}
					string name = null;
					var posArgs = att.PositionalArguments;
					if (posArgs.Count == 1)
						name = posArgs [0].ConstantValue as string;
					if (string.IsNullOrEmpty (name))
						name = prop.Name;
					
					// HACK: Work around bug #1586 in the least obtrusive way possible. Strip out any outlet
					// with the name 'view' on subclasses of MonoTouch.UIKit.UIViewController to avoid 
					// conflicts with the view property mapped there
					if (name == "view") {
						if (type.GetAllBaseTypeDefinitions ().Any (p => p.ReflectionName == "MonoTouch.UIKit.UIViewController"))
							continue;
					}
					
					var ol = new IBOutlet (name, prop.Name, null, prop.ReturnType.ReflectionName);
					if (MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (prop.Region.FileName))
						ol.IsDesigner = true;
					info.Outlets.Add (ol);
					break;
				}
			}
			
			foreach (var meth in type.Methods) {
				foreach (var att in meth.Attributes) {
					var attType = att.AttributeType;
					bool isIBAction = attType.Equals (Resolve (dom, ibactionAttType));
					if (!isIBAction) {
						if (!attType.Equals (Resolve (dom, exportAttType)))
							continue;
					}
					bool isDesigner = MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (
						meth.DeclaringTypeDefinition.Region.FileName);
					//only support Export from old designer files, user code must be IBAction
					if (!isDesigner && !isIBAction)
						continue;
					
					string[] name = null;
					var posArgs = att.PositionalArguments;
					if (posArgs.Count == 1 || posArgs.Count == 2) {
						var n = posArgs [0].ConstantValue as string;
						if (!string.IsNullOrEmpty (n))
							name = n.Split (colonChar);
					}
					var action = new IBAction (name != null ? name [0] : meth.Name, meth.Name);
					int i = 1;
					foreach (var param in meth.Parameters) {
						string label = name != null && i < name.Length ? name [i] : null;
						if (label != null && label.Length == 0)
							label = null;
						action.Parameters.Add (new IBActionParameter (label, param.Name, null, param.Type.ReflectionName));
					}
					if (MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (meth.Region.FileName))
						action.IsDesigner = true;
					info.Actions.Add (action);
					break;
				}
			}
		}

		void UpdateTypeMembers (ProjectDom dom, NSObjectTypeInfo info, IType type)
		{
			info.Actions.Clear ();
			info.Outlets.Clear ();
			
			foreach (var prop in type.Properties) {
				foreach (var att in prop.Attributes) {
					bool isIBOutlet = att.AttributeType.FullName == iboutletAttType.FullName;
					if (!isIBOutlet) {
						if (att.AttributeType.FullName != connectAttType.FullName)
							continue;
					}
					string name = null;
					if (att.PositionalArguments.Count == 1)
						name = (string)((System.CodeDom.CodePrimitiveExpression)att.PositionalArguments[0]).Value;
					if (string.IsNullOrEmpty (name))
						name = prop.Name;
					var ol = new IBOutlet (name, prop.Name, null, prop.ReturnType.FullName);
					if (MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (prop.DeclaringType.CompilationUnit.FileName))
						ol.IsDesigner = true;
					info.Outlets.Add (ol);
					break;
				}
			}
			
			foreach (var meth in type.Methods) {
				foreach (var att in meth.Attributes) {
					bool isIBAction = att.AttributeType.FullName == ibactionAttType.FullName;
					if (!isIBAction) {
						if (att.AttributeType.FullName != exportAttType.FullName)
							continue;
					}
					bool isDesigner =  MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (
						meth.DeclaringType.CompilationUnit.FileName);
					//only support Export from old designer files, user code must be IBAction
					if (!isDesigner && !isIBAction)
						continue;
					
					string[] name = null;
					if (att.PositionalArguments.Count == 1) {
						var n = (string)((System.CodeDom.CodePrimitiveExpression)att.PositionalArguments[0]).Value;
						if (!string.IsNullOrEmpty (n))
							name = n.Split (colonChar);
					}
					var action = new IBAction (name != null? name [0] : meth.Name, meth.Name);
					int i = 1;
					foreach (var param in meth.Parameters) {
						string label = name != null && i < name.Length? name[i] : null;
						if (label != null && label.Length == 0)
							label = null;
						action.Parameters.Add (new IBActionParameter (label, param.Name, null, param.ReturnType.FullName));
					}
					if (MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (meth.DeclaringType.CompilationUnit.FileName))
						action.IsDesigner = true;
					info.Actions.Add (action);
					break;
				}
			}
		}

		public void ResolveTypes (NSObjectTypeInfo type)
		{
			NSObjectTypeInfo resolved;
			if (type.BaseObjCType == null && type.BaseCliType != null) {
				if (TryResolveCliToObjc (type.BaseCliType, out resolved)) {
					if (resolved.IsModel)
						type.BaseIsModel = true;
					type.BaseObjCType = resolved.ObjCName;
					//FIXME: handle type references better
					if (resolved.IsUserType)
						type.UserTypeReferences.Add (resolved.ObjCName);
				} else {
					//managed classes many have implicitly registered base classes with a name not
					//expressible in obj-c. In this case, the best we can do is walk down the 
					//hierarchy until we find a valid base class
					foreach (var bt in dom.GetInheritanceTree (dom.GetType (type.BaseCliType))) {
						if (bt.ClassType != ClassType.Class)
							continue;
						if (TryResolveCliToObjc (bt.FullName, out resolved)) {
							if (resolved.IsModel)
								type.BaseIsModel = true;
							type.BaseObjCType = resolved.ObjCName;
							if (resolved.IsUserType)
								type.UserTypeReferences.Add (resolved.ObjCName);
							break;
						}
					}
				}
			}
			
			if (type.BaseCliType == null && type.BaseObjCType != null) {
				if (TryResolveObjcToCli (type.BaseObjCType, out resolved))
					type.BaseCliType = resolved.CliName;
			}
			
			foreach (var outlet in type.Outlets) {
				if (outlet.ObjCType == null) {
					if (TryResolveCliToObjc (outlet.CliType, out resolved)) {
						outlet.ObjCType = resolved.ObjCName;
						if (resolved.IsUserType)
							type.UserTypeReferences.Add (resolved.ObjCName);
					}
				}
				if (outlet.CliType == null) {
					if (TryResolveObjcToCli (outlet.ObjCType, out resolved)) {
						outlet.CliType = resolved.CliName;
					} else {
						MessageService.ShowError (GettextCatalog.GetString ("Error while syncing object c type."),
							string.Format (GettextCatalog.GetString ("Type '{0}' can't be resolved to a valid cli type."), outlet.ObjCType));
						ContainsErrors = true;
						outlet.CliType = outlet.ObjCType;
					}
				}
			}
			
			foreach (var action in type.Actions) {
				foreach (var param in action.Parameters) {
					if (param.ObjCType == null) {
						if (TryResolveCliToObjc (param.CliType, out resolved)) {
							param.ObjCType = resolved.ObjCName;
							if (resolved.IsUserType)
								type.UserTypeReferences.Add (resolved.ObjCName);
						}
					}
					if (param.CliType == null) {
						if (TryResolveObjcToCli (param.ObjCType, out resolved))
							param.CliType = resolved.CliName;
					}
				}
			}
		}

		NSObjectTypeInfo ConvertType (TypeSystemService.ProjectContentWrapper dom, ITypeDefinition type)
		{
			string objcName = null;
			bool isModel = false;
			bool registeredInDesigner = true;
			
			foreach (var att in type.Attributes) {
				var attType = att.AttributeType;
				if (attType.Equals (Resolve (dom, registerAttType))) {
					if (type.GetProjectContent () != null) {
						registeredInDesigner &=
							MonoDevelop.DesignerSupport.CodeBehind.IsDesignerFile (att.Region.FileName);
					}
					
					//type registered with an explicit type name are up to the user to provide a valid name
					var posArgs = att.PositionalArguments;
					if (posArgs.Count == 1 || posArgs.Count == 2)
						objcName = posArgs [0].ConstantValue as string;
					//non-nested types in the root namespace have names accessible from obj-c
					else if (string.IsNullOrEmpty (type.Namespace) && type.Name.IndexOf ('.') < 0)
						objcName = type.Name;
				}
				
				if (attType.Equals (Resolve (dom, modelAttType)))
					isModel = true;
			}
			
			if (string.IsNullOrEmpty (objcName))
				return null;
			
			string baseType = type.DirectBaseTypes.First ().ReflectionName;
			if (baseType == "System.Object")
				baseType = null;
			
			bool isUserType = !type.ParentAssembly.Equals (Resolve (dom, nsobjectType).ParentAssembly);
			
			var info = new NSObjectTypeInfo (objcName, type.ReflectionName, null, baseType, isModel, isUserType, registeredInDesigner);

			if (info.IsUserType) {
				UpdateTypeMembers (dom, info, type);
				info.DefinedIn = type.Parts.Select (p => (string) p.Region.FileName).ToArray ();
			}
			
			return info;
		}

		void UpdateUserType (NSObjectTypeInfo type)
		{
			if (userClasses.Add (type.ObjCName))
				xcodeProjectDirty = true;

			//FIXME: types dep on other types on project, need better regeneration skipping			
			//FilePath target = outputDir.Combine (type.ObjCName + ".h");
			//if (File.Exists (target) && File.GetLastWriteTime (target) >= type.DefinedIn.Max (f => File.GetLastWriteTime (f)))
			//	return;
			
			if (!Directory.Exists (outputDir))
				Directory.CreateDirectory (outputDir);
			
			type.GenerateObjcType (outputDir);
			
			string fullH = outputDir.Combine (type.ObjCName + ".h");
			trackedFiles[fullH] = File.GetLastWriteTime (fullH);
		}

		public void GenerateObjcType (NSObjectTypeInfo type, string directory)
		{
			if (type.IsModel)
				throw new ArgumentException ("Cannot generate definition for model");
			
			string hFilePath = Path.Combine (directory, type.ObjCName + ".h");
			string mFilePath = Path.Combine (directory, type.ObjCName + ".m");
			
			using (var sw = File.CreateText (hFilePath)) {
				sw.WriteLine (modificationWarning);
				sw.WriteLine ();
				
				sw.WriteLine ("#import <UIKit/UIKit.h>");
				foreach (var reference in type.UserTypeReferences) {
					sw.WriteLine ("#import \"{0}.h\"", reference);
				}
				sw.WriteLine ();
				
				sw.WriteLine ("@interface {0} : {1} {{", type.ObjCName, type.BaseIsModel? "NSObject" : type.BaseObjCType);
				foreach (var outlet in type.Outlets) {
					sw.WriteLine ("\t{0} *_{1};", outlet.ObjCType, outlet.ObjCName);
				}
				sw.WriteLine ("}");
				sw.WriteLine ();
				
				foreach (var outlet in type.Outlets) {
					sw.WriteLine ("@property (nonatomic, retain) IBOutlet {0} *{1};", outlet.ObjCType, outlet.ObjCName);
					sw.WriteLine ();
				}
				
				foreach (var action in type.Actions) {
					if (action.Parameters.Any (p => p.ObjCType == null))
						continue;
					WriteActionSignature (action, sw);
					sw.WriteLine (";");
					sw.WriteLine ();
				}
				
				sw.WriteLine ("@end");
			}
			
			using (var sw = File.CreateText (mFilePath)) {
				sw.WriteLine (modificationWarning);
				sw.WriteLine ();
				
				sw.WriteLine ("#import \"{0}.h\"", type.ObjCName);
				sw.WriteLine ();
				
				sw.WriteLine ("@implementation {0}", type.ObjCName);
				sw.WriteLine ();
				
				bool hasOutlet = false;
				foreach (var outlet in type.Outlets) {
					sw.WriteLine ("@synthesize {0} = _{0};", outlet.ObjCName);
					hasOutlet = true;
				}
				if (hasOutlet)
					sw.WriteLine ();
				
				foreach (var action in type.Actions) {
					if (action.Parameters.Any (p => p.ObjCType == null))
						continue;
					WriteActionSignature (action, sw);
					sw.WriteLine (" {");
					sw.WriteLine ("}");
					sw.WriteLine ();
				}
				
				sw.WriteLine ("@end");
			}
		}

		void ResolveTypes (ProjectDom dom, NSObjectTypeInfo type)
		{
			NSObjectTypeInfo resolved;
			
			if (type.BaseObjCType == null && type.BaseCliType != null) {
				if (cliTypes.TryGetValue (type.BaseCliType, out resolved)) {
					if (resolved.IsModel)
						type.BaseIsModel = true;
					type.BaseObjCType = resolved.ObjCName;
					if (resolved.IsUserType)
						type.UserTypeReferences.Add (resolved.ObjCName);
				} else {
					//managed classes many have implicitly registered base classes with a name not
					//expressible in obj-c. In this case, the best we can do is walk down the 
					//hierarchy until we find a valid base class
					foreach (var bt in dom.GetInheritanceTree (dom.GetType (type.BaseCliType))) { 
						if (cliTypes.TryGetValue (bt.FullName, out resolved)) {
							if (resolved.IsModel)
								type.BaseIsModel = true;
							type.BaseObjCType = resolved.ObjCName;
							if (resolved.IsUserType)
								type.UserTypeReferences.Add (resolved.ObjCName);
							break;
						}
					}
					if (type.BaseObjCType == null)
						Console.WriteLine ("Could not resolve CLI type '{0}'", type.BaseCliType);
				}
			}
			
			if (type.BaseCliType == null && type.BaseObjCType != null) {
				if (objcTypes.TryGetValue (type.BaseObjCType, out resolved))
					type.BaseCliType = resolved.CliName;
			}
			
			foreach (var outlet in type.Outlets) {
				if (outlet.ObjCType == null) {
					if (cliTypes.TryGetValue (outlet.CliType, out resolved)) {
						outlet.ObjCType = resolved.ObjCName;
						if (resolved.IsUserType)
							type.UserTypeReferences.Add (resolved.ObjCName);
					}
				}
				if (outlet.CliType == null) {
					if (objcTypes.TryGetValue (outlet.ObjCType, out resolved))
						outlet.CliType = resolved.CliName;
				}
			}
			
			foreach (var action in type.Actions) {
				foreach (var param in action.Parameters) {
					if (param.ObjCType == null) {
						if (cliTypes.TryGetValue (param.CliType, out resolved)) {
							param.ObjCType = resolved.ObjCName;
							if (resolved.IsUserType)
								type.UserTypeReferences.Add (resolved.ObjCName);
						}
					}
					if (param.CliType == null) {
						if (objcTypes.TryGetValue (param.ObjCType, out resolved))
							param.CliType = resolved.CliName;
					}
				}
			}
		}

		public XcodeSyncedType (NSObjectTypeInfo type, string[] frameworks)
		{
			Frameworks = frameworks;
			Type = type;
		}

		static NSObjectTypeInfo ConvertType (ProjectDom dom, IType type)
		{
			string objcName = null;
			bool isModel = false;
			foreach (var att in type.Attributes) {
				if (att.AttributeType.FullName == registerAttType.FullName) {
					//type registered with an explicit type name are up to the user to proide a valid name
					if (att.PositionalArguments.Count == 1)
						objcName = (string)((System.CodeDom.CodePrimitiveExpression)att.PositionalArguments[0]).Value;
					//non-nested types in the root namespace have names accessible from obj-c
					else if (string.IsNullOrEmpty (type.Namespace) && type.Name.IndexOf ('.') < 0)
						objcName = type.Name;
				}
				if (att.AttributeType.FullName == modelAttType.FullName) {
					isModel = true;
				}
			}
			if (string.IsNullOrEmpty (objcName))
				return null;
			var info = new NSObjectTypeInfo (objcName, type.FullName, null, type.BaseType.FullName, isModel);
			info.IsUserType = type.SourceProject != null;
			
			if (info.IsUserType) {
				UpdateTypeMembers (dom, info, type);
				info.DefinedIn = type.Parts.Select (p => (string) p.CompilationUnit.FileName).ToArray ();
			}
			
			return info;
		}

		public XcodeSyncedType (NSObjectTypeInfo type)
		{
			this.Type = type;
		}

		static void UpdateTypeMembers (ProjectDom dom, NSObjectTypeInfo info, IType type)
		{
			info.Actions.Clear ();
			info.Outlets.Clear ();
			
			foreach (var prop in type.Properties) {
				foreach (var att in prop.Attributes) {
					if (att.AttributeType.FullName != connectAttType.FullName)
						continue;
					string name = null;
					if (att.PositionalArguments.Count == 1)
						name = (string)((System.CodeDom.CodePrimitiveExpression)att.PositionalArguments[0]).Value;
					if (string.IsNullOrEmpty (name))
						name = prop.Name;
					info.Outlets.Add (new IBOutlet (name, prop.Name, null, prop.ReturnType.FullName));
					break;
				}
			}
			
			foreach (var meth in type.Methods) {
				foreach (var att in meth.Attributes) {
					if (att.AttributeType.FullName != exportAttType.FullName)
						continue;
					string[] name = null;
					if (att.PositionalArguments.Count == 1) {
						var n = (string)((System.CodeDom.CodePrimitiveExpression)att.PositionalArguments[0]).Value;
						if (!string.IsNullOrEmpty (n))
							name = n.Split (colonChar);
					}
					var action = new IBAction (name != null? name [0] : meth.Name, meth.Name);
					info.Actions.Add (action);
					int i = 1;
					foreach (var param in meth.Parameters) {
						string label = name != null && i < name.Length? name[i] : null;
						if (label != null && label.Length == 0)
							label = null;
						action.Parameters.Add (new IBActionParameter (label, param.Name, null, param.ReturnType.FullName));
					}
					break;
				}
			}
		}

		/// <summary>
		/// Resolves the Objective-C types by mapping the known .NET type information.
		/// </summary>
		/// <param name='type'>
		/// An NSObjectTypeInfo with the .NET type information filled in.
		/// </param>
		public void ResolveCliToObjc (NSObjectTypeInfo type)
		{
			NSObjectTypeInfo resolved;
			
			if (type.BaseObjCType == null && type.BaseCliType != null) {
				if (TryResolveCliToObjc (type.BaseCliType, out resolved)) {
					if (resolved.IsModel)
						type.BaseIsModel = true;
					type.BaseObjCType = resolved.ObjCName;
					//FIXME: handle type references better
					if (resolved.IsUserType)
						type.UserTypeReferences.Add (resolved.ObjCName);
				} else {
					// managed classes may have implicitly registered base classes with a name not
					// expressible in obj-c. In this case, the best we can do is walk down the 
					// hierarchy until we find a valid base class
					foreach (var bt in dom.GetInheritanceTree (dom.GetType (type.BaseCliType))) {
						if (bt.ClassType != ClassType.Class)
							continue;
						
						if (TryResolveCliToObjc (bt.FullName, out resolved)) {
							if (resolved.IsModel)
								type.BaseIsModel = true;
							type.BaseObjCType = resolved.ObjCName;
							if (resolved.IsUserType)
								type.UserTypeReferences.Add (resolved.ObjCName);
							break;
						}
					}
				}
			}
			
			foreach (var outlet in type.Outlets) {
				if (outlet.ObjCType != null)
					continue;
				
				if (TryResolveCliToObjc (outlet.CliType, out resolved)) {
					outlet.ObjCType = resolved.ObjCName;
					if (resolved.IsUserType)
						type.UserTypeReferences.Add (resolved.ObjCName);
				}
			}
			
			foreach (var action in type.Actions) {
				foreach (var param in action.Parameters) {
					if (param.ObjCType != null)
						continue;
					
					if (TryResolveCliToObjc (param.CliType, out resolved)) {
						param.ObjCType = resolved.ObjCName;
						if (resolved.IsUserType)
							type.UserTypeReferences.Add (resolved.ObjCName);
					}
				}
			}
		}

		public static NSObjectTypeInfo ParseHeader (string headerFile)
		{
			var text = System.IO.File.ReadAllText (headerFile);
			var matches = ibRegex.Matches (text);
			var type = new NSObjectTypeInfo (System.IO.Path.GetFileNameWithoutExtension (headerFile), null, null, null, false);
			foreach (Match match in matches) {
				var kind = match.Groups[1].Value;
				var def = match.Groups[2].Value;
				if (kind == "IBOutlet") {
					var split = def.Split (whitespaceChars, StringSplitOptions.RemoveEmptyEntries);
					if (split.Length != 2)
						continue;
					type.Outlets.Add (new IBOutlet (split[1].TrimStart ('*'), null, split[0].TrimEnd ('*'), null));
				} else {
					string[] split = def.Split (colonChar);
					var action = new IBAction (split[0].Trim (), null);
					string label = null;
					for (int i = 1; i < split.Length; i++) {
						var s = split[i].Split (splitActionParamsChars, StringSplitOptions.RemoveEmptyEntries);
						var par = new IBActionParameter (label, s[1], s[0], null);
						label = s.Length == 3? s[2] : null;
						action.Parameters.Add (par);
					}
					type.Actions.Add (action);
				}
			}
			return type;
		}