// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading;

namespace ICSharpCode.SharpDevelop.Dom
{
	public class DefaultProjectContent : IProjectContent
	{
		readonly List<IProjectContent> referencedContents = new List<IProjectContent>();
		
		// we use a list of Dictionaries because we need multiple dictionaries:
		// each uses another StringComparer
		// (C#: StringComparer.InvariantCulture, VB: StringComparer.InvariantCultureCaseInsensitive)
		// new dictionaries are added to the list when required
		List<Dictionary<string, IClass>> classLists = new List<Dictionary<string, IClass>>();
		List<Dictionary<string, NamespaceStruct>> namespaces = new List<Dictionary<string, NamespaceStruct>>();
		
		XmlDoc xmlDoc = new XmlDoc();
		IUsing defaultImports;
		bool isDisposed;
		
		public IUsing DefaultImports {
			get {
				return defaultImports;
			}
			set {
				defaultImports = value;
			}
		}
		
		public virtual object Project {
			get {
				return null;
			}
		}
		
		/// <summary>
		/// Gets if the project content is representing the current version of the assembly.
		/// This property always returns true for ParseProjectContents but might return false
		/// for ReflectionProjectContent/CecilProjectContent if the file was changed.
		/// </summary>
		public virtual bool IsUpToDate {
			get {
				return true;
			}
		}
		
		public List<Dictionary<string, IClass>> ClassLists {
			get {
				if (classLists.Count == 0) {
					classLists.Add(new Dictionary<string, IClass>(language.NameComparer));
				}
				return classLists;
			}
		}
		
		public ICollection<string> NamespaceNames {
			get {
				return Namespaces[0].Keys;
			}
		}
		
		protected List<Dictionary<string, NamespaceStruct>> Namespaces {
			get {
				if (namespaces.Count == 0) {
					namespaces.Add(new Dictionary<string, NamespaceStruct>(language.NameComparer));
				}
				return namespaces;
			}
		}
		
		// NamespaceStruct behaves like a reference type because it only consists of readonly references!
		protected struct NamespaceStruct
		{
			public readonly List<IClass> Classes;
			public readonly List<string> SubNamespaces;
			
			public NamespaceStruct(string name) // struct must have a parameter
			{
				this.Classes = new List<IClass>();
				this.SubNamespaces = new List<string>();
			}
			
			public NamespaceStruct MergeWith(NamespaceStruct other)
			{
				NamespaceStruct newStruct = new NamespaceStruct(null);
				newStruct.Classes.AddRange(this.Classes);
				newStruct.Classes.AddRange(other.Classes);
				newStruct.SubNamespaces.AddRange(this.SubNamespaces);
				newStruct.SubNamespaces.AddRange(other.SubNamespaces);
				return newStruct;
			}
		}
		
		/// <summary>
		/// Gets the class dictionary that uses the name comparison rules of <paramref name="language"/>.
		/// </summary>
		protected Dictionary<string, IClass> GetClasses(LanguageProperties language)
		{
			for (int i = 0; i < classLists.Count; ++i) {
				if (classLists[i].Comparer == language.NameComparer)
					return classLists[i];
			}
			Dictionary<string, IClass> d;
			if (classLists.Count > 0) {
				Dictionary<string, IClass> oldList = classLists[0];
				d = new Dictionary<string, IClass>(oldList.Count, language.NameComparer);
				foreach (KeyValuePair<string, IClass> pair in oldList) {
					// don't use d.Add(), the new name language might treat two names as equal
					// that were unequal in the old dictionary
					d[pair.Key] = pair.Value;
				}
			} else {
				d = new Dictionary<string, IClass>(language.NameComparer);
			}
			classLists.Add(d);
			return d;
		}
		
		/// <summary>
		/// Gets the namespace dictionary that uses the name comparison rules of <paramref name="language"/>.
		/// </summary>
		protected Dictionary<string, NamespaceStruct> GetNamespaces(LanguageProperties language)
		{
			for (int i = 0; i < namespaces.Count; ++i) {
				if (namespaces[i].Comparer == language.NameComparer)
					return namespaces[i];
			}
			Dictionary<string, NamespaceStruct> d;
			if (namespaces.Count > 0) {
				Dictionary<string, NamespaceStruct> oldList = namespaces[0];
				d = new Dictionary<string, NamespaceStruct>(oldList.Count, language.NameComparer);
				foreach (KeyValuePair<string, NamespaceStruct> pair in oldList) {
					NamespaceStruct ns;
					if (d.TryGetValue(pair.Key, out ns)) {
						// we got a name conflict due to the new NameComparer.
						// This happens if a C# assembly contains the namespace "a" and "A",
						// and now we're trying to get a dictionary for use in VB.
						d[pair.Key] = ns.MergeWith(pair.Value);
					} else {
						d.Add(pair.Key, pair.Value);
					}
				}
			} else {
				d = new Dictionary<string, NamespaceStruct>(language.NameComparer);
			}
			namespaces.Add(d);
			return d;
		}
		
		public XmlDoc XmlDoc {
			get {
				return xmlDoc;
			}
			protected set {
				xmlDoc = value;
			}
		}
		
		public ICollection<IClass> Classes {
			get {
				lock (namespaces) {
					List<IClass> list = new List<IClass>(ClassLists[0].Count + 10);
					foreach (IClass c in ClassLists[0].Values) {
						if (c is GenericClassContainer) {
							GenericClassContainer gcc = (GenericClassContainer)c;
							list.AddRange(gcc.RealClasses);
						} else {
							list.Add(c);
						}
					}
					return list;
				}
			}
		}
		
		SystemTypes systemTypes;
		
		/// <summary>
		/// Gets a class that allows to conveniently access commonly used types in the system
		/// namespace.
		/// </summary>
		public virtual SystemTypes SystemTypes {
			get {
				if (systemTypes == null) {
					systemTypes = new SystemTypes(this);
				}
				return systemTypes;
			}
		}
		
		public ICollection<IProjectContent> ReferencedContents {
			get {
				return referencedContents;
			}
		}
		
		LanguageProperties language = LanguageProperties.CSharp;
		
		/// <summary>
		/// Gets/Sets the properties of the language this project content was written in.
		/// </summary>
		public LanguageProperties Language {
			[DebuggerStepThrough]
			get {
				return language;
			}
			set {
				if (value == null) throw new ArgumentNullException();
				language = value;
			}
		}
		
		public string GetXmlDocumentation(string memberTag)
		{
			CheckNotDisposed();
			string desc = xmlDoc.GetDocumentation(memberTag);
			if (desc != null) {
				return desc;
			}
			lock (referencedContents) {
				foreach (IProjectContent referencedContent in referencedContents) {
					desc = referencedContent.XmlDoc.GetDocumentation(memberTag);
					if (desc != null) {
						return desc;
					}
				}
			}
			return null;
		}
		
		public virtual void Dispose()
		{
			xmlDoc.Dispose();
			isDisposed = true;
		}
		
		[Conditional("DEBUG")]
		void CheckNotDisposed()
		{
			// TODO: this is broken - we are accessing project contents even after
			// they have been unloaded, e.g. on other threads
			if (!isDisposed) {
				// throw new ObjectDisposedException();
			}
		}
		
		public void AddClassToNamespaceList(IClass addClass)
		{
			lock (namespaces) {
				AddClassToNamespaceListInternal(addClass);
			}
			DomCache.Clear();
		}
		
		/// <summary>
		/// Container class that is used when multiple classes with different type parameter
		/// count have the same class name.
		/// 
		/// The GenericClassContainer is only used internally to hold the class list, it is never returned by any public API.
		/// </summary>
		private sealed class GenericClassContainer : DefaultClass
		{
			public GenericClassContainer(string fullyQualifiedName) : base(DefaultCompilationUnit.DummyCompilationUnit, fullyQualifiedName) {}
			
			IClass[] realClasses = new IClass[4];
			
			public IEnumerable<IClass> RealClasses {
				get {
					foreach (IClass c in realClasses) {
						if (c != null) yield return c;
					}
				}
			}
			
			public int RealClassCount {
				get {
					int count = 0;
					foreach (IClass c in realClasses) {
						if (c != null) count += 1;
					}
					return count;
				}
			}
			
			public IClass Get(int typeParameterCount)
			{
				if (realClasses.Length > typeParameterCount)
					return realClasses[typeParameterCount];
				else
					return null;
			}
			
			public IClass GetBest(int typeParameterCount)
			{
				IClass c;
				for (int i = typeParameterCount; i < realClasses.Length; i++) {
					c = Get(i);
					if (c != null) return c;
				}
				for (int i = typeParameterCount - 1; i >= 0; i--) {
					c = Get(i);
					if (c != null) return c;
				}
				return null;
			}
			
			public void Set(IClass c)
			{
				int typeParameterCount = c.TypeParameters.Count;
				if (realClasses.Length <= typeParameterCount) {
					IClass[] newArray = new IClass[typeParameterCount + 2];
					realClasses.CopyTo(newArray, 0);
					realClasses = newArray;
				}
				realClasses[typeParameterCount] = c;
			}
			
			public void Remove(int typeParameterCount)
			{
				if (realClasses.Length > typeParameterCount)
					realClasses[typeParameterCount] = null;
			}
		}
		
		protected void AddClassToNamespaceListInternal(IClass addClass)
		{
			// Freeze the class when adding it to the project content
			addClass.Freeze();
			
			Debug.Assert(!(addClass is CompoundClass));
			Debug.Assert(!addClass.HasCompoundClass);
			
			string fullyQualifiedName = addClass.FullyQualifiedName;
			IClass existingClass = GetClassInternal(fullyQualifiedName, addClass.TypeParameters.Count, language);
			if (existingClass != null && existingClass.TypeParameters.Count == addClass.TypeParameters.Count) {
				LoggingService.Debug("Adding existing class " + addClass.Name + " from " + Path.GetFileName(addClass.CompilationUnit.FileName));
				CompoundClass compound = existingClass as CompoundClass;
				if (compound != null) {
					// mark the class as partial
					// (VB allows specifying the 'partial' modifier only on one part)
					addClass.HasCompoundClass = true;
					
					// add the new class to the compound class
					List<IClass> newParts = new List<IClass>(compound.Parts);
					newParts.Add(addClass);
					// construct a replacement CompoundClass with the new part list
					addClass = CompoundClass.Create(newParts);
					LoggingService.Debug("Added new part (old part count=" + compound.Parts.Count +", new part count=" + newParts.Count + ")");
				} else {
					// Instead of overwriting a class with another, treat both parts as partial.
					// This fixes SD2-1217.
					
					if (!(addClass.IsPartial || language.ImplicitPartialClasses)) {
						LoggingService.Info("Duplicate class " + fullyQualifiedName + ", creating compound");
					} else {
						LoggingService.Debug("Creating compound for " + fullyQualifiedName);
					}
					
					// Merge existing non-partial class with addClass
					addClass.HasCompoundClass = true;
					existingClass.HasCompoundClass = true;
					
					addClass = CompoundClass.Create(new[] { addClass, existingClass });
				}
			}
			AddClassToNamespaceListInternal2(addClass);
		}
		
		void AddClassToNamespaceListInternal2(IClass addClass)
		{
			bool isReplacingExistingClass = false;
			string fullyQualifiedName = addClass.FullyQualifiedName;
			IClass oldDictionaryClass;
			if (GetClasses(language).TryGetValue(fullyQualifiedName, out oldDictionaryClass)) {
				isReplacingExistingClass = true;
				GenericClassContainer gcc = oldDictionaryClass as GenericClassContainer;
				if (gcc != null) {
					gcc.Set(addClass);
					return;
				} else if (oldDictionaryClass.TypeParameters.Count != addClass.TypeParameters.Count) {
					gcc = new GenericClassContainer(fullyQualifiedName);
					gcc.Set(addClass);
					gcc.Set(oldDictionaryClass);
					addClass = gcc;
				}
			}
			
			foreach (Dictionary<string, IClass> classes in ClassLists) {
				classes[fullyQualifiedName] = addClass;
			}
			string nSpace = addClass.Namespace;
			if (nSpace == null) {
				nSpace = String.Empty;
			}
			CreateNamespace(nSpace);
			List<IClass> classList = GetNamespaces(this.language)[nSpace].Classes;
			if (isReplacingExistingClass) {
				for (int i = 0; i < classList.Count; i++) {
					if (classList[i].FullyQualifiedName == fullyQualifiedName) {
						classList[i] = addClass;
						return;
					}
				}
			}
			classList.Add(addClass);
		}
		
		void CreateNamespace(string nSpace)
		{
			Dictionary<string, NamespaceStruct> dict = GetNamespaces(this.language);
			if (dict.ContainsKey(nSpace))
				return;
			NamespaceStruct namespaceStruct = new NamespaceStruct(nSpace);
			dict.Add(nSpace, namespaceStruct);
			// use the same namespaceStruct for all dictionaries
			foreach (Dictionary<string, NamespaceStruct> otherDict in namespaces) {
				if (otherDict == dict) continue;
				NamespaceStruct existingNamespaceStruct;
				if (otherDict.TryGetValue(nSpace, out existingNamespaceStruct))
					otherDict[nSpace] = existingNamespaceStruct.MergeWith(namespaceStruct);
				else
					otherDict.Add(nSpace, namespaceStruct);
			}
			if (nSpace.Length == 0)
				return;
			// add to parent namespace
			int pos = nSpace.LastIndexOf('.');
			string parent;
			string subNs;
			if (pos < 0) {
				parent = "";
				subNs = nSpace;
			} else {
				parent = nSpace.Substring(0, pos);
				subNs = nSpace.Substring(pos + 1);
			}
			CreateNamespace(parent);
			dict[parent].SubNamespaces.Add(subNs);
		}
		
		/// <summary>
		/// Removes the specified namespace from all namespace lists if the namespace is empty.
		/// </summary>
		void RemoveEmptyNamespace(string nSpace)
		{
			if (nSpace == null || nSpace.Length == 0) return;
			Dictionary<string, NamespaceStruct> dict = GetNamespaces(this.language);
			if (!dict.ContainsKey(nSpace))
				return;
			// remove only if really empty
			if (dict[nSpace].Classes.Count > 0 || dict[nSpace].SubNamespaces.Count > 0)
				return;
			// remove the namespace from all dictionaries
			foreach (Dictionary<string, NamespaceStruct> anyDict in namespaces) {
				anyDict.Remove(nSpace);
			}
			// remove the namespace from parent's SubNamespaces list
			int pos = nSpace.LastIndexOf('.');
			string parent;
			string subNs;
			if (pos < 0) {
				parent = "";
				subNs = nSpace;
			} else {
				parent = nSpace.Substring(0, pos);
				subNs = nSpace.Substring(pos + 1);
			}
			dict[parent].SubNamespaces.Remove(subNs);
			RemoveEmptyNamespace(parent); // remove parent if also empty
		}
		
		List<IAttribute> assemblyAttributes = new List<IAttribute>();
		
		public virtual IList<IAttribute> GetAssemblyAttributes()
		{
			lock (namespaces) {
				return assemblyAttributes.ToArray();
			}
		}
		
		public void RemoveCompilationUnit(ICompilationUnit unit)
		{
			lock (namespaces) {
				foreach (IClass c in unit.Classes) {
					RemoveClass(c);
				}
				foreach (IAttribute attr in unit.Attributes)
					assemblyAttributes.Remove(attr);
			}
			DomCache.Clear();
		}
		
		public void UpdateCompilationUnit(ICompilationUnit oldUnit, ICompilationUnit parserOutput, string fileName)
		{
			parserOutput.Freeze();
			lock (namespaces) {
				if (oldUnit != null) {
					foreach (IClass c in oldUnit.Classes)
						RemoveClass(c);
					foreach (IAttribute attr in oldUnit.Attributes)
						assemblyAttributes.Remove(attr);
				}
				
				foreach (IClass c in parserOutput.Classes) {
					AddClassToNamespaceListInternal(c);
				}
				assemblyAttributes.AddRange(parserOutput.Attributes);
			}
			DomCache.Clear();
		}
		
		protected void RemoveClass(IClass @class)
		{
			string fullyQualifiedName = @class.FullyQualifiedName;
			int typeParameterCount = @class.TypeParameters.Count;
			if (@class.HasCompoundClass) {
				LoggingService.Debug("Removing part " + @class.CompilationUnit.FileName + " from compound class " + @class.FullyQualifiedName);
				
				// remove a part of a partial class
				// Use "as" cast to fix SD2-680: the stored class might be a part not marked as partial
				CompoundClass compound = GetClassInternal(fullyQualifiedName, typeParameterCount, language) as CompoundClass;
				if (compound == null) {
					LoggingService.Warn("compound class not found");
					return;
				}
				typeParameterCount = compound.TypeParameters.Count;
				
				List<IClass> newParts = new List<IClass>(compound.Parts);
				newParts.Remove(@class);
				if (newParts.Count > 1) {
					LoggingService.Debug("Part removed, old part count = " + compound.Parts.Count + ", new part count=" + newParts.Count);
					AddClassToNamespaceListInternal2(CompoundClass.Create(newParts));
					return;
				} else if (newParts.Count == 1) {
					LoggingService.Debug("Second-to-last part removed (old part count = " + compound.Parts.Count + "), overwriting compound with last part");
					newParts[0].HasCompoundClass = false;
					AddClassToNamespaceListInternal2(newParts[0]);
					return;
				} else { // newParts.Count == 0
					// this should not be possible, the compound should have been destroyed when there was only 1 part left
					LoggingService.Warn("All parts removed, remove compound");
					@class = compound; // all parts removed, remove compound class
				}
			}
			
			IClass classInDictionary;
			if (!GetClasses(language).TryGetValue(fullyQualifiedName, out classInDictionary)) {
				return;
			}
			
			GenericClassContainer gcc = classInDictionary as GenericClassContainer;
			if (gcc != null) {
				gcc.Remove(typeParameterCount);
				if (gcc.RealClassCount > 0) {
					return;
				}
			}
			
			foreach (Dictionary<string, IClass> classes in ClassLists) {
				classes.Remove(fullyQualifiedName);
			}
			
			string nSpace = @class.Namespace;
			if (nSpace == null) {
				nSpace = String.Empty;
			}
			
			// Remove class from namespace lists
			List<IClass> classList = GetNamespaces(this.language)[nSpace].Classes;
			for (int i = 0; i < classList.Count; i++) {
				if (language.NameComparer.Equals(classList[i].FullyQualifiedName, fullyQualifiedName)) {
					classList.RemoveAt(i);
					break;
				}
			}
			if (classList.Count == 0) {
				RemoveEmptyNamespace(nSpace);
			}
		}
		
		#region Default Parser Layer dependent functions
		public IClass GetClass(string typeName, int typeParameterCount)
		{
			return GetClass(typeName, typeParameterCount, language, GetClassOptions.Default);
		}
		
		protected IClass GetClassInternal(string typeName, int typeParameterCount, LanguageProperties language)
		{
			CheckNotDisposed();
			#if DEBUG
			if (System.Text.RegularExpressions.Regex.IsMatch (typeName, "`[0-9]+$"))
				Debug.Assert(false, "how did a Reflection type name get here?");
			#endif
			lock (namespaces) {
				IClass c;
				if (GetClasses(language).TryGetValue(typeName, out c)) {
					GenericClassContainer gcc = c as GenericClassContainer;
					if (gcc != null) {
						return gcc.GetBest(typeParameterCount);
					}
					return c;
				}
				return null;
			}
		}
		
		bool IsAccessibleClass(IClass c)
		{
			// check the outermost class (which is either public or internal)
			while (c.DeclaringType != null)
				c = c.DeclaringType;
			return c.IsPublic || c.ProjectContent.InternalsVisibleTo(this);
		}
		
		public IClass GetClass(string typeName, int typeParameterCount, LanguageProperties language, GetClassOptions options)
		{
			IClass c = GetClassInternal(typeName, typeParameterCount, language);
			if (c != null && c.TypeParameters.Count == typeParameterCount) {
				return c;
			}
			
			// Search in references:
			if ((options & GetClassOptions.LookInReferences) != 0) {
				lock (referencedContents) {
					foreach (IProjectContent content in referencedContents) {
						// Look for the class in the referenced content.
						// Don't do a inner-class search in the recursive call - one search
						// done by this GetClass call is sufficient.
						IClass contentClass = content.GetClass(
							typeName, typeParameterCount, language,
							options & ~(GetClassOptions.LookInReferences | GetClassOptions.LookForInnerClass));
						if (contentClass != null) {
							if (contentClass.TypeParameters.Count == typeParameterCount
							    && IsAccessibleClass(contentClass))
							{
								return contentClass;
							} else {
								c = contentClass;
							}
						}
					}
				}
			}
			
			if ((options & GetClassOptions.LookForInnerClass) != 0) {
				// not found -> maybe nested type -> trying to find class that contains this one.
				int lastIndex = typeName.LastIndexOf('.');
				if (lastIndex > 0) {
					string outerName = typeName.Substring(0, lastIndex);
					IClass upperClass = GetClass(outerName, typeParameterCount, language, options);
					if (upperClass != null) {
						foreach (IClass upperBaseClass in upperClass.ClassInheritanceTree) {
							IList<IClass> innerClasses = upperBaseClass.InnerClasses;
							if (innerClasses != null) {
								string innerName = typeName.Substring(lastIndex + 1);
								foreach (IClass innerClass in innerClasses) {
									if (language.NameComparer.Equals(innerClass.Name, innerName)) {
										if (innerClass.TypeParameters.Count == typeParameterCount) {
											return innerClass;
										} else {
											// store match
											c = innerClass;
										}
									}
								}
							}
						}
					}
				}
			}
			if ((options & GetClassOptions.ExactMatch) == GetClassOptions.ExactMatch) {
				return null;
			} else {
				// no matching class found - we'll return a class with different type paramter count
				return c;
			}
		}
		
		public List<ICompletionEntry> GetNamespaceContents(string nameSpace)
		{
			List<ICompletionEntry> namespaceList = new List<ICompletionEntry>();
			AddNamespaceContents(namespaceList, nameSpace, language, true);
			return namespaceList;
		}
		
		public List<ICompletionEntry> GetAllContents()
		{
			List<ICompletionEntry> list = new List<ICompletionEntry>();
			AddAllContents(list, this.language, true);
			return list;
		}
		
		/// <summary>
		/// Adds the contents of all namespaces in this project to the <paramref name="list"/>.
		/// </summary>
		/// <param name="lookInReferences">If true, contents of referenced projects will be added as well (not recursive - just 1 level deep).</param>
		public void AddAllContents(List<ICompletionEntry> list, LanguageProperties language, bool lookInReferences)
		{
			if (lookInReferences) {
				lock (referencedContents) {
					foreach (IProjectContent content in referencedContents) {
						content.AddAllContents(list, language, false);
					}
				}
			}
			lock (namespaces) {
				Dictionary<string, NamespaceStruct> dict = GetNamespaces(language);
				foreach (var namespaceStruct in dict.Values) {
					AddNamespaceStructContents(list, namespaceStruct, language, lookInReferences);
				}
			}
		}
		
		/// <summary>
		/// Adds the contents of the specified <paramref name="nameSpace"/> to the <paramref name="list"/>.
		/// </summary>
		/// <param name="lookInReferences">If true, contents of referenced projects will be added as well (not recursive - just 1 level deep).</param>
		public void AddNamespaceContents(List<ICompletionEntry> list, string nameSpace, LanguageProperties language, bool lookInReferences)
		{
			if (nameSpace == null) {
				return;
			}
			
			if (lookInReferences) {
				lock (referencedContents) {
					foreach (IProjectContent content in referencedContents) {
						content.AddNamespaceContents(list, nameSpace, language, false);
					}
				}
			}
			
			lock (namespaces) {
				Dictionary<string, NamespaceStruct> dict = GetNamespaces(language);
				if (dict.ContainsKey(nameSpace)) {
					NamespaceStruct ns = dict[nameSpace];
					AddNamespaceStructContents(list, ns, language, lookInReferences);
				}
			}
		}

		void AddNamespaceStructContents(List<ICompletionEntry> list, NamespaceStruct ns, LanguageProperties language, bool lookInReferences)
		{
			int newCapacity = list.Count + ns.Classes.Count + ns.SubNamespaces.Count;
			if (list.Capacity < newCapacity)
				list.Capacity = Math.Max(list.Count * 2, newCapacity);
			foreach (IClass c in ns.Classes) {
				if (c is GenericClassContainer) {
					foreach (IClass realClass in ((GenericClassContainer)c).RealClasses) {
						AddNamespaceContentsClass(list, realClass, language, lookInReferences);
					}
				} else {
					AddNamespaceContentsClass(list, c, language, lookInReferences);
				}
			}
			foreach (string subns in ns.SubNamespaces) {
				NamespaceEntry subnsEntry = new NamespaceEntry(subns);
				if (!list.Contains(subnsEntry))	// PERF
					list.Add(subnsEntry);
			}
		}
		
		void AddNamespaceContentsClass(List<ICompletionEntry> list, IClass c, LanguageProperties language, bool lookInReferences)
		{
			if (c.IsInternal && !lookInReferences) {
				// internal class and we are looking at it from another project content
				return;
			}
			if (language.ShowInNamespaceCompletion(c))
				list.Add(c);
			if (language.ImportModules && c.ClassType == ClassType.Module) {
				foreach (IMember m in c.Methods) {
					if (m.IsAccessible(null, false))
						list.Add(m);
				}
				foreach (IMember m in c.Events) {
					if (m.IsAccessible(null, false))
						list.Add(m);
				}
				foreach (IMember m in c.Fields) {
					if (m.IsAccessible(null, false))
						list.Add(m);
				}
				foreach (IMember m in c.Properties) {
					if (m.IsAccessible(null, false))
						list.Add(m);
				}
			}
		}
		
		public bool NamespaceExists(string name)
		{
			return NamespaceExists(name, language, true);
		}
		
		public bool NamespaceExists(string name, LanguageProperties language, bool lookInReferences)
		{
			if (name == null) {
				return false;
			}
			
			if (lookInReferences) {
				lock (referencedContents) {
					foreach (IProjectContent content in referencedContents) {
						if (content.NamespaceExists(name, language, false)) {
							return true;
						}
					}
				}
			}
			
			lock (namespaces) {
				return GetNamespaces(language).ContainsKey(name);
			}
		}
		
		bool MatchesRequest(SearchTypeRequest request, ref SearchTypeResult result)
		{
			if (result.NamespaceResult != null)
				return request.TypeParameterCount == 0;
			else {
				IReturnType rt = result.Result;
				if (rt == null)
					return false;
				if (rt.TypeArgumentCount != request.TypeParameterCount)
					return false;
				IClass c = rt.GetUnderlyingClass();
				if (c != null)
					return IsAccessibleClass(c);
				else
					return true;
			}
		}
		
		public SearchTypeResult SearchType(SearchTypeRequest request)
		{
			string name = request.Name;
			if (string.IsNullOrEmpty(name)) {
				return SearchTypeResult.Empty;
			}
			
			// 'result' holds the fall-back result if no result with the right type parameter count is found.
			SearchTypeResult result = SearchTypeResult.Empty;
			
			if (name.IndexOf('.') < 0) {
				for (IClass outerClass = request.CurrentType; outerClass != null; outerClass = outerClass.DeclaringType) {
					// Try inner classes (in full inheritance tree)
					// Don't use loop with cur = cur.BaseType because of inheritance cycles
					foreach (IClass baseClass in outerClass.ClassInheritanceTree) {
						if (baseClass.ClassType == ClassType.Class || baseClass.ClassType == ClassType.Struct || baseClass.ClassType == ClassType.Module) {
							foreach (IClass innerClass in baseClass.InnerClasses) {
								if (language.NameComparer.Equals(innerClass.Name, name)) {
									result = new SearchTypeResult(innerClass);
									if (MatchesRequest(request, ref result)) {
										return result;
									}
								}
							}
						}
					}
				}
			}
			
			for (IUsingScope usingScope = request.CurrentUsingScope; usingScope != null; usingScope = usingScope.Parent) {
				string fullname;
				if (string.IsNullOrEmpty(usingScope.NamespaceName)) {
					// Try if name is already the full type name
					fullname = name;
				} else {
					fullname = usingScope.NamespaceName + "." + name;
				}
				IClass c = GetClass(fullname, request.TypeParameterCount);
				if (c != null) {
					result = new SearchTypeResult(c);
					if (MatchesRequest(request, ref result)) {
						return result;
					}
				}
				if (NamespaceExists(fullname)) {
					result = new SearchTypeResult(fullname, null);
					if (MatchesRequest(request, ref result)) {
						return result;
					}
				}
				
				// prefer aliases over imported types
				foreach (IUsing u in usingScope.Usings) {
					if (u.HasAliases) {
						if (SearchTypeInUsing(u, request, ref result))
							return result;
					}
				}
				foreach (IUsing u in usingScope.Usings) {
					if (!u.HasAliases) {
						if (SearchTypeInUsing(u, request, ref result))
							return result;
					}
				}
			}
			
			if (defaultImports != null) {
				if (SearchTypeInUsing(defaultImports, request, ref result))
					return result;
			}
			return result;
		}

		bool SearchTypeInUsing(IUsing u, SearchTypeRequest request, ref SearchTypeResult result)
		{
			foreach (IReturnType r in u.SearchType(request.Name, request.TypeParameterCount)) {
				result = new SearchTypeResult(r, u);
				if (MatchesRequest(request, ref result)) {
					return true;
				}
			}
			string nsResult = u.SearchNamespace(request.Name);
			if (nsResult != null) {
				result = new SearchTypeResult(nsResult, null);
				if (MatchesRequest(request, ref result)) {
					return true;
				}
			}
			return false;
		}
		
		/// <summary>
		/// Gets the position of a member in this project content (not a referenced one).
		/// </summary>
		/// <param name="fullMemberName">The full class name in Reflection syntax (always case sensitive, ` for generics)</param>
		/// <param name="lookInReferences">Whether to search in referenced project contents.</param>
		public IClass GetClassByReflectionName(string className, bool lookInReferences)
		{
			if (className == null)
				throw new ArgumentNullException("className");
			int typeParameterCount;
			className = ReflectionLayer.ReflectionClass.ConvertReflectionNameToFullName(className, out typeParameterCount);
			GetClassOptions options = GetClassOptions.Default;
			if (!lookInReferences)
				options &= ~GetClassOptions.LookInReferences;
			return GetClass(className, typeParameterCount, LanguageProperties.CSharp, options);
		}
		
		/// <summary>
		/// Gets the position of a member in this project content (not a referenced one).
		/// </summary>
		/// <param name="fullMemberName">The member name in Reflection syntax (always case sensitive, ` for generics).
		/// member name = [ExplicitInterface .] MemberName [`TypeArgumentCount] [(Parameters)]</param>
		public static IMember GetMemberByReflectionName(IClass curClass, string fullMemberName)
		{
			if (curClass == null)
				return null;
			int pos = fullMemberName.IndexOf('(');
			if (pos > 0) {
				// is method call
				
				int colonPos = fullMemberName.LastIndexOf(':');
				if (colonPos > 0) {
					fullMemberName = fullMemberName.Substring(0, colonPos);
				}
				
				string interfaceName = null;
				string memberName = fullMemberName.Substring(0, pos);
				int pos2 = memberName.LastIndexOf('.');
				if (pos2 > 0) {
					interfaceName = memberName.Substring(0, pos2);
					memberName = memberName.Substring(pos2 + 1);
				}
				
				// put class name in front of full member name because we'll compare against it later
				fullMemberName = curClass.DotNetName + "." + fullMemberName;
				
				IMethod firstMethod = null;
				foreach (IMethod m in curClass.Methods) {
					if (m.Name == memberName) {
						if (firstMethod == null) firstMethod = m;
						StringBuilder dotnetName = new StringBuilder(m.DotNetName);
						dotnetName.Append('(');
						for (int i = 0; i < m.Parameters.Count; i++) {
							if (i > 0) dotnetName.Append(',');
							if (m.Parameters[i].ReturnType != null) {
								dotnetName.Append(m.Parameters[i].ReturnType.DotNetName);
							}
						}
						dotnetName.Append(')');
						if (dotnetName.ToString() == fullMemberName) {
							return m;
						}
					}
				}
				return firstMethod;
			} else {
				string interfaceName = null;
				string memberName = fullMemberName;
				pos = memberName.LastIndexOf('.');
				if (pos > 0) {
					interfaceName = memberName.Substring(0, pos);
					memberName = memberName.Substring(pos + 1);
				}
				// get first method with that name, but prefer method without parameters
				IMethod firstMethod = null;
				foreach (IMethod m in curClass.Methods) {
					if (m.Name == memberName) {
						if (firstMethod == null || m.Parameters.Count == 0)
							firstMethod = m;
					}
				}
				if (firstMethod != null)
					return firstMethod;
				return curClass.SearchMember(memberName, LanguageProperties.CSharp);
			}
		}
		
		public FilePosition GetPosition(IEntity d)
		{
			IMember m = d as IMember;
			IClass c = d as IClass;
			if (m != null) {
				return new FilePosition(m.DeclaringType.CompilationUnit, m.Region.BeginLine, m.Region.BeginColumn);
			} else if (c != null) {
				return new FilePosition(c.CompilationUnit, c.Region.BeginLine, c.Region.BeginColumn);
			} else {
				return FilePosition.Empty;
			}
		}
		#endregion
		
		public void AddReferencedContent(IProjectContent pc)
		{
			if (pc != null) {
				lock (this.ReferencedContents) {
					this.ReferencedContents.Add(pc);
				}
			}
		}
		
		public event EventHandler ReferencedContentsChanged;
		
		protected virtual void OnReferencedContentsChanged(EventArgs e)
		{
			systemTypes = null; // re-create system types
			DomCache.Clear();
			if (ReferencedContentsChanged != null) {
				ReferencedContentsChanged(this, e);
			}
		}
		
		public bool InternalsVisibleTo(IProjectContent otherProjectContent)
		{
			return this == otherProjectContent;
		}
		
		public static readonly IProjectContent DummyProjectContent = new DummyContent();
		
		private class DummyContent : DefaultProjectContent
		{
			public override string ToString()
			{
				return "[DummyProjectContent]";
			}
			
			public override SystemTypes SystemTypes {
				get {
					return HostCallback.GetCurrentProjectContent().SystemTypes;
				}
			}
		}
		
		/// <inheritdoc/>
		public virtual string AssemblyName {
			get {
				return null;
			}
		}
	}
}