// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using Microsoft.Win32;
using System.Linq;
using System.Diagnostics;
using Tools.DotNETCommon;
using System.Xml.Linq;
using System.Xml;

namespace UnrealBuildTool
{
	/// <summary>
	/// Represents a folder within the master project (e.g. Visual Studio solution)
	/// </summary>
	abstract class MasterProjectFolder
	{
		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="InitOwnerProjectFileGenerator">Project file generator that owns this object</param>
		/// <param name="InitFolderName">Name for this folder</param>
		public MasterProjectFolder( ProjectFileGenerator InitOwnerProjectFileGenerator, string InitFolderName )
		{
			OwnerProjectFileGenerator = InitOwnerProjectFileGenerator;
			FolderName = InitFolderName;
		}

		/// Name of this folder
		public string FolderName
		{
			get;
			private set;
		}


		/// <summary>
		/// Adds a new sub-folder to this folder
		/// </summary>
		/// <param name="SubFolderName">Name of the new folder</param>
		/// <returns>The newly-added folder</returns>
		public MasterProjectFolder AddSubFolder( string SubFolderName )
		{
			MasterProjectFolder ResultFolder = null;

			List<string> FolderNames = SubFolderName.Split(new char[2] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar }, 2, StringSplitOptions.RemoveEmptyEntries).ToList();
			string FirstFolderName = FolderNames[0];

			bool AlreadyExists = false;
			foreach (MasterProjectFolder ExistingFolder in SubFolders)
			{
				if (ExistingFolder.FolderName.Equals(FirstFolderName, StringComparison.InvariantCultureIgnoreCase))
				{
					// Already exists!
					ResultFolder = ExistingFolder;
					AlreadyExists = true;
					break;
				}
			}

			if (!AlreadyExists)
			{
				ResultFolder = OwnerProjectFileGenerator.AllocateMasterProjectFolder(OwnerProjectFileGenerator, FirstFolderName);
				SubFolders.Add(ResultFolder);
			}

			if (FolderNames.Count > 1)
			{
				ResultFolder = ResultFolder.AddSubFolder(FolderNames[1]);
			}

			return ResultFolder;
		}


		/// <summary>
		/// Recursively searches for the specified project and returns the folder that it lives in, or null if not found
		/// </summary>
		/// <param name="Project">The project file to look for</param>
		/// <returns>The found folder that the project is in, or null</returns>
		public MasterProjectFolder FindFolderForProject( ProjectFile Project )
		{
			foreach( MasterProjectFolder CurFolder in SubFolders )
			{
				MasterProjectFolder FoundFolder = CurFolder.FindFolderForProject( Project );
				if( FoundFolder != null )
				{
					return FoundFolder;
				}
			}

			foreach( ProjectFile ChildProject in ChildProjects )
			{
				if( ChildProject == Project )
				{
					return this;
				}
			}

			return null;
		}

		/// Owner project generator
		readonly ProjectFileGenerator OwnerProjectFileGenerator;

		/// Sub-folders
		public readonly List<MasterProjectFolder> SubFolders = new List<MasterProjectFolder>();

		/// Child projects
		public readonly List<ProjectFile> ChildProjects = new List<ProjectFile>();

		/// Files in this folder.  These are files that aren't part of any project, but display in the IDE under the project folder
		/// and can be browsed/opened by the user easily in the user interface
		public readonly List<string> Files = new List<string>();		
	}

	/// <summary>
	/// The type of project files to generate
	/// </summary>
	enum ProjectFileFormat
	{
		Make,
		CMake,
		QMake,
		KDevelop,
		CodeLite,
		VisualStudio,
		VisualStudio2012,
		VisualStudio2013,
		VisualStudio2015,
		VisualStudio2017,
		VisualStudio2019,
		XCode,
		Eddie,
		VisualStudioCode,
		VisualStudioMac,
		CLion
	}

	/// <summary>
	/// Static class containing 
	/// </summary>
	static class ProjectFileGeneratorSettings
	{
		/// <summary>
		/// Default list of project file formats to generate
		/// </summary>
		[XmlConfigFile(Category = "ProjectFileGenerator", Name = "Format")]
		public static string Format = null;

		/// <summary>
		/// Parses a list of project file formats from a string
		/// </summary>
		/// <param name="Formats"></param>
		/// <returns>Sequence of project file formats</returns>
		public static IEnumerable<ProjectFileFormat> ParseFormatList(string Formats)
		{
			foreach(string FormatName in Formats.Split('+').Select(x => x.Trim()))
			{
				ProjectFileFormat Format;
				if(Enum.TryParse(FormatName, true, out Format))
				{
					yield return Format;
				}
				else
				{
					Log.TraceError("Invalid project file format '{0}'", FormatName);
				}
			}
		}
	}

	/// <summary>
	/// Base class for all project file generators
	/// </summary>
	abstract class ProjectFileGenerator
	{
		/// <summary>
		/// Global static that enables generation of project files.  Doesn't actually compile anything.
		/// This is enabled only via UnrealBuildTool command-line.
		/// </summary>
		public static bool bGenerateProjectFiles = false;

		/// <summary>
		/// True if we're generating lightweight project files for a single game only, excluding most engine code, documentation, etc.
		/// </summary>
		public bool bGeneratingGameProjectFiles = false;

		/// <summary>
		/// Optional list of platforms to generate projects for
		/// </summary>
		readonly List<UnrealTargetPlatform> ProjectPlatforms = new List<UnrealTargetPlatform>();

		/// <summary>
		/// When bGeneratingGameProjectFiles=true, this is the game name we're generating projects for
		/// </summary>
		protected string GameProjectName = null;

		/// <summary>
		/// Whether we should include configurations for "Test" and "Shipping" in generated projects (pass "-NoShippingConfigs" to disable this)
		/// </summary>
		public static bool bIncludeTestAndShippingConfigs = true;

		/// <summary>
		/// True if intellisense data should be generated (takes a while longer)
		/// </summary>
		bool bGenerateIntelliSenseData = true;

		/// <summary>
		/// True if we should include documentation in the generated projects
		/// </summary>
		[XmlConfigFile]
		protected bool bIncludeDocumentation = false;

		/// <summary>
		/// True if all documentation languages should be included in generated projects, otherwise only "INT" will be included
		/// </summary>
		bool bAllDocumentationLanguages = false;

		/// <summary>
		/// True if build targets should pass the -useprecompiled argument
		/// </summary>
		public bool bUsePrecompiled = false;

		/// <summary>
		/// True if we should include engine source in the generated solution
		/// </summary>
		protected bool bIncludeEngineSource = true;

		/// <summary>
		/// Whether to include enterprise source in the generated solution
		/// </summary>
		protected bool bIncludeEnterpriseSource = true;

		/// <summary>
		/// True if shader source files should be included in the generated projects
		/// </summary>
		protected bool bIncludeShaderSource = true;

		/// <summary>
		/// True if build system files should be included
		/// </summary>
		bool bIncludeBuildSystemFiles = true;

		/// <summary>
		/// True if we should include config files (.ini files) in the generated project
		/// </summary>
		protected bool bIncludeConfigFiles = true;

		/// <summary>
		/// True if we should include localization files (.int/.kor/etc files) in the generated project
		/// </summary>
		bool bIncludeLocalizationFiles = false;

		/// <summary>
		/// True if we should include template files (.template files) in the generated project
		/// </summary>
		protected bool bIncludeTemplateFiles = true;

		/// <summary>
		/// True if we should include program projects in the generated solution
		/// </summary>
		protected bool IncludeEnginePrograms = true;

		/// <summary>
		/// True if we should include .NET Core projects in the generated solution
		/// </summary>
		bool bIncludeDotNETCoreProjects = false;

		/// <summary>
		/// True if we should reflect "Source" sub-directories on disk in the master project as master project directories.
		/// This arguably adds some visual clutter to the master project, but is truer to the on-disk file organization.
		/// </summary>
		bool bKeepSourceSubDirectories = true;

		/// <summary>
		/// Relative path to the directory where the master project file will be saved to
		/// </summary>
		public static DirectoryReference MasterProjectPath = UnrealBuildTool.RootDirectory; // We'll save the master project to our "root" folder

		/// <summary>
		/// Name of the UE4 engine project that contains all of the engine code, config files and other files
		/// </summary>
		public const string EngineProjectFileNameBase = "UE4";

		/// <summary>
		/// Name of the UE4 enterprise project that contains all of the enterprise code, config files and other files
		/// </summary>
		public const string EnterpriseProjectFileNameBase = "Studio";

		/// <summary>
		/// When ProjectsAreIntermediate is true, this is the directory to store generated project files
		/// @todo projectfiles: Ideally, projects for game modules/targets would be created in the game's Intermediate folder!
		/// </summary>
		public static DirectoryReference IntermediateProjectFilesPath = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Intermediate", "ProjectFiles" );

		/// <summary>
		/// Path to timestamp file, recording when was the last time projects were created.
		/// </summary>
		public static string ProjectTimestampFile = Path.Combine(IntermediateProjectFilesPath.FullName, "Timestamp");

		/// <summary>
		/// Global static new line string used by ProjectFileGenerator to generate project files.
		/// </summary>
		public static readonly string NewLine = Environment.NewLine;

		/// <summary>
		/// If true, we'll parse subdirectories of third-party projects to locate source and header files to include in the
		/// generated projects.  This can make the generated projects quite a bit bigger, but makes it easier to open files
		/// directly from the IDE.
		/// </summary>
		bool bGatherThirdPartySource = false;

		/// <summary>
		/// Indicates whether we should process dot net core based C# projects
		/// </summary>
		bool AllowDotNetCoreProjects = false;

		/// <summary>
		/// Name of the master project file (e.g. base file name for the solution file for Visual Studio, or the Xcode project file on Mac)
		/// </summary>
		[XmlConfigFile]
		protected string MasterProjectName = "UE4";

		/// <summary>
		/// If true, sets the master project name according to the name of the folder it's in
		/// </summary>
		[XmlConfigFile]
		protected bool bMasterProjectNameFromFolder = false;

		/// <summary>
		/// Maps all module names that were included in generated project files, to actual project file objects.
		/// </summary>
		protected Dictionary<string, ProjectFile> ModuleToProjectFileMap = new Dictionary<string, ProjectFile>( StringComparer.InvariantCultureIgnoreCase );

		/// <summary>
		/// If generating project files for a single project, the path to its .uproject file.
		/// </summary>
		public readonly FileReference OnlyGameProject;
	
		/// <summary>
		/// File extension for project files we'll be generating (e.g. ".vcxproj")
		/// </summary>
		abstract public string ProjectFileExtension
		{
			get;
		}

		/// <summary>
		/// True if we should include IntelliSense data in the generated project files when possible
		/// </summary>
		virtual public bool ShouldGenerateIntelliSenseData()
		{
			return bGenerateIntelliSenseData;
		}

		/// <summary>
		/// Default constructor.
		/// </summary>
		/// <param name="InOnlyGameProject">The project file passed in on the command line</param>
		public ProjectFileGenerator(FileReference InOnlyGameProject)
		{
			AllowDotNetCoreProjects = Environment.CommandLine.Contains("-dotnetcore");
			OnlyGameProject = InOnlyGameProject;
			XmlConfig.ApplyTo(this);
		}

		/// <summary>
		/// Adds all .automation.csproj files to the solution.
		/// </summary>
		void AddAutomationModules(List<FileReference> UnrealProjectFiles, MasterProjectFolder ProgramsFolder)
		{
			MasterProjectFolder Folder = ProgramsFolder.AddSubFolder("Automation");
			List<DirectoryReference> BuildFolders = new List<DirectoryReference>();
			foreach (FileReference UnrealProjectFile in UnrealProjectFiles)
			{
				DirectoryReference GameBuildFolder = DirectoryReference.Combine(UnrealProjectFile.Directory, "Build");
				if (DirectoryReference.Exists(GameBuildFolder))
				{
					BuildFolders.Add(GameBuildFolder);
				}
			}

			// Find all the automation modules .csproj files to add
			List<FileReference> ModuleFiles = RulesCompiler.FindAllRulesSourceFiles(RulesCompiler.RulesFileType.AutomationModule, null, ForeignPlugins:null, AdditionalSearchPaths: BuildFolders );
			foreach (FileReference ProjectFile in ModuleFiles)
			{
				if (FileReference.Exists(ProjectFile))
				{
					VCSharpProjectFile Project = new VCSharpProjectFile(ProjectFile);
					Project.ShouldBuildForAllSolutionTargets = false;//true;
					AddExistingProjectFile(Project, bForceDevelopmentConfiguration: true);
                    AutomationProjectFiles.Add( Project );
					Folder.ChildProjects.Add( Project );
				}
			}
		}

		/// <summary>
		/// Finds all csproj within Engine/Source/Programs, and add them if their UE4CSharp.prog file exists.
		/// </summary>
		void DiscoverCSharpProgramProjects(MasterProjectFolder ProgramsFolder)
		{
			string[] UnsupportedPlatformNames = Utils.MakeListOfUnsupportedPlatforms(SupportedPlatforms).ToArray();

			List<FileReference> FoundProjects = new List<FileReference>();
			DirectoryReference EngineProgramsSource = DirectoryReference.Combine(UnrealBuildTool.EngineDirectory, "Source", "Programs");
			DiscoverCSharpProgramProjectsRecursively(EngineProgramsSource, FoundProjects);

			foreach (FileReference FoundProject in FoundProjects)
			{
				if(!FoundProject.ContainsAnyNames(UnsupportedPlatformNames, EngineProgramsSource))
				{
					VCSharpProjectFile Project = new VCSharpProjectFile(FoundProject);

					if (AllowDotNetCoreProjects || !Project.IsDotNETCoreProject())
					{
						Project.ShouldBuildForAllSolutionTargets = true;
						Project.ShouldBuildByDefaultForSolutionTargets = true;

						AddExistingProjectFile(Project, bForceDevelopmentConfiguration: false);
						ProgramsFolder.ChildProjects.Add(Project);
					}
				}
			}
		}

		private static void DiscoverCSharpProgramProjectsRecursively(DirectoryReference SearchFolder, List<FileReference> FoundProjects)
		{
			// Scan all the files in this directory
			bool bSearchSubFolders = true;
			foreach (FileReference File in DirectoryLookupCache.EnumerateFiles(SearchFolder))
			{
				// If we find a csproj or sln, we should not recurse this directory.
				bool bIsCsProj = File.HasExtension(".csproj");
				bool bIsSln = File.HasExtension(".sln");
				bSearchSubFolders &= !(bIsCsProj || bIsSln);
				// If we found an sln, ignore completely.
				if (bIsSln)
				{
					break;
				}
				// For csproj files, add them to the sln if the UE4CSharp.prog file also exists.
				if (bIsCsProj && FileReference.Exists(FileReference.Combine(SearchFolder, "UE4CSharp.prog")))
				{
					FoundProjects.Add(File);
				}
			}

			// If we didn't find anything to stop the search, search all the subdirectories too
			if (bSearchSubFolders)
			{
				foreach (DirectoryReference SubDirectory in DirectoryLookupCache.EnumerateDirectories(SearchFolder))
				{
					DiscoverCSharpProgramProjectsRecursively(SubDirectory, FoundProjects);
				}
			}
		}

		/// <summary>
		/// Finds the game projects that we're generating project files for
		/// </summary>
		/// <returns>List of project files</returns>
		public List<FileReference> FindGameProjects()
		{
			List<FileReference> ProjectFiles = new List<FileReference>();
			if(OnlyGameProject != null)
			{
				ProjectFiles.Add(OnlyGameProject);
			}
			else
			{
				ProjectFiles.AddRange(NativeProjects.EnumerateProjectFiles().Where(x => ShouldGenerateProject(x)));
			}
			return ProjectFiles;
		}

		/// <summary>
		/// Determines if we should generate IDE project files for for the given project
		/// </summary>
		/// <param name="ProjectFile">The project to check</param>
		/// <returns>True to generate a project, false otherwise</returns>
		private static bool ShouldGenerateProject(FileReference ProjectFile)
		{
			DirectoryReference ProjectDirectory = ProjectFile.Directory;
			DirectoryReference SourceFolder = DirectoryReference.Combine(ProjectDirectory, "Source");
			DirectoryReference IntermediateSourceFolder = DirectoryReference.Combine(ProjectDirectory, "Intermediate", "Source");
			return DirectoryReference.Exists(SourceFolder) || DirectoryReference.Exists(IntermediateSourceFolder);
		}

		/// <summary>
		/// Gets the user's preferred IDE from their editor settings
		/// </summary>
		/// <param name="ProjectFile">Project file being built</param>
		/// <param name="Format">Preferred format for the project being built</param>
		/// <returns>True if a preferred IDE was set, false otherwise</returns>
		public static bool GetPreferredSourceCodeAccessor(FileReference ProjectFile, out ProjectFileFormat Format)
		{
			ConfigHierarchy Ini = ConfigCache.ReadHierarchy(ConfigHierarchyType.EditorSettings, DirectoryReference.FromFile(ProjectFile), BuildHostPlatform.Current.Platform);

			string PreferredAccessor;
			if (Ini.GetString("/Script/SourceCodeAccess.SourceCodeAccessSettings", "PreferredAccessor", out PreferredAccessor))
			{
				PreferredAccessor = PreferredAccessor.ToLowerInvariant();
				if (PreferredAccessor == "clionsourcecodeaccessor")
				{
					Format = ProjectFileFormat.CLion;
					return true;
				}
				else if (PreferredAccessor == "codelitesourcecodeaccessor")
				{
					Format = ProjectFileFormat.CodeLite;
					return true;
				}
				else if (PreferredAccessor == "xcodesourcecodeaccessor")
				{
					Format = ProjectFileFormat.XCode;
					return true;
				}
				else if (PreferredAccessor == "visualstudiocode")
				{
					Format = ProjectFileFormat.VisualStudioCode;
					return true;
				}
				else if (PreferredAccessor == "kdevelopsourcecodeaccessor")
				{
					Format = ProjectFileFormat.KDevelop;
					return true;
				}
				else if (PreferredAccessor == "visualstudiosourcecodeaccessor")
				{
					Format = ProjectFileFormat.VisualStudio;
					return true;
				}
				else if (PreferredAccessor == "visualstudio2015")
				{
					Format = ProjectFileFormat.VisualStudio2015;
					return true;
				}
				else if (PreferredAccessor == "visualstudio2017")
				{
					Format = ProjectFileFormat.VisualStudio2017;
					return true;
				}
				else if (PreferredAccessor == "visualstudio2019")
				{
					Format = ProjectFileFormat.VisualStudio2019;
					return true;
				}
			}

			Format = ProjectFileFormat.VisualStudio;
			return false;
		}

		/// <summary>
		/// Generates a Visual Studio solution file and Visual C++ project files for all known engine and game targets.
		/// Does not actually build anything.
		/// </summary>
		/// <param name="PlatformProjectGenerators">The registered platform project generators</param>
		/// <param name="Arguments">Command-line arguments</param>
		public virtual bool GenerateProjectFiles( PlatformProjectGeneratorCollection PlatformProjectGenerators, String[] Arguments )
		{
			bool bSuccess = true;

			// Parse project generator options
			bool IncludeAllPlatforms = true;
			ConfigureProjectFileGeneration( Arguments, ref IncludeAllPlatforms);

			if (bGeneratingGameProjectFiles || UnrealBuildTool.IsEngineInstalled())
			{
				Log.TraceInformation("Discovering modules, targets and source code for project...");

				MasterProjectPath = OnlyGameProject.Directory;

				// Set the project file name
				MasterProjectName = OnlyGameProject.GetFileNameWithoutExtension();

				if (!DirectoryReference.Exists(DirectoryReference.Combine(MasterProjectPath, "Source")))
				{
					if (!DirectoryReference.Exists(DirectoryReference.Combine(MasterProjectPath, "Intermediate", "Source")))
					{
						if (BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Mac)
						{
							MasterProjectPath = UnrealBuildTool.EngineDirectory;
							GameProjectName = "UE4Game";
						}
						if (!DirectoryReference.Exists(DirectoryReference.Combine(MasterProjectPath, "Source")))
						{
							throw new BuildException("Directory '{0}' is missing 'Source' folder.", MasterProjectPath);
						}
					}
				}
				IntermediateProjectFilesPath = DirectoryReference.Combine(MasterProjectPath, "Intermediate", "ProjectFiles");
			}
			else
			{
				// Set the master project name from the folder name
				if(bMasterProjectNameFromFolder)
				{
					string NewMasterProjectName = MasterProjectPath.GetDirectoryName();
					if(!String.IsNullOrEmpty(NewMasterProjectName))
					{
						MasterProjectName = NewMasterProjectName;
					}
				}

				// Write out the name of the master project file, so the runtime knows to use it
				FileReference MasterProjectNameLocation = FileReference.Combine(UnrealBuildTool.EngineDirectory, "Intermediate", "ProjectFiles", "MasterProjectName.txt");
				DirectoryReference.CreateDirectory(MasterProjectNameLocation.Directory);
				FileReference.WriteAllText(MasterProjectNameLocation, MasterProjectName);
			}

			// Modify the name if specific platforms were given
			if (ProjectPlatforms.Count > 0)
			{
				// Sort the platforms names so we get consistent names
				List<string> SortedPlatformNames = new List<string>();
				foreach (UnrealTargetPlatform SpecificPlatform in ProjectPlatforms)
				{
					SortedPlatformNames.Add(SpecificPlatform.ToString());
				}
				SortedPlatformNames.Sort();

				MasterProjectName += "_";
				foreach (string SortedPlatform in SortedPlatformNames)
				{
					MasterProjectName += SortedPlatform;
					IntermediateProjectFilesPath = new DirectoryReference(IntermediateProjectFilesPath.FullName + SortedPlatform);
				}
			}

            // Optionally include the folder name in the project
            if (Environment.GetEnvironmentVariable("UE_NAME_PROJECT_AFTER_FOLDER") == "1")
            {
                MasterProjectName += "_" + Path.GetFileName(MasterProjectPath.ToString());
            }

			bool bCleanProjectFiles = Arguments.Any(x => x.Equals("-CleanProjects", StringComparison.InvariantCultureIgnoreCase));
			if (bCleanProjectFiles)
			{
				CleanProjectFiles(MasterProjectPath, MasterProjectName, IntermediateProjectFilesPath);
			}

			// Figure out which platforms we should generate project files for.
			string SupportedPlatformNames;
			SetupSupportedPlatformsAndConfigurations( IncludeAllPlatforms:IncludeAllPlatforms, SupportedPlatformNames:out SupportedPlatformNames );

			Log.TraceVerbose( "Detected supported platforms: " + SupportedPlatformNames );

			RootFolder = AllocateMasterProjectFolder( this, "<Root>" );

			// Build the list of games to generate projects for
			List<FileReference> AllGameProjects = FindGameProjects();

			// Find all of the module files.  This will filter out any modules or targets that don't belong to platforms
			// we're generating project files for.
			List<FileReference> AllModuleFiles = DiscoverModules(AllGameProjects);

			ProjectFile EngineProject;
			ProjectFile EnterpriseProject;
			List<ProjectFile> GameProjects;
			List<ProjectFile> ModProjects;
			Dictionary<FileReference, ProjectFile> ProgramProjects;
			{
				// Setup buildable projects for all targets
				AddProjectsForAllTargets( PlatformProjectGenerators, AllGameProjects, out EngineProject, out EnterpriseProject, out GameProjects, out ProgramProjects );

				// Add projects for mods
				AddProjectsForMods(GameProjects, out ModProjects);

				// Add all game projects and game config files
				AddAllGameProjects(GameProjects, SupportedPlatformNames, RootFolder);

				// Set the game to be the default project
				if(ModProjects.Count > 0)
				{
					DefaultProject = ModProjects.First();
				}
				else if(bGeneratingGameProjectFiles && GameProjects.Count > 0)
				{
					DefaultProject = GameProjects.First();
				}

				//Related Debug Project Files - Tuple here has the related Debug Project, SolutionFolder
				List<Tuple<ProjectFile, string>> DebugProjectFiles = new List<Tuple<ProjectFile, string>>();

				// Place projects into root level solution folders
				if ( bIncludeEngineSource )
				{
					// If we're still missing an engine project because we don't have any targets for it, make one up.
					if( EngineProject == null )
					{
						FileReference ProjectFilePath = FileReference.Combine(IntermediateProjectFilesPath, EngineProjectFileNameBase + ProjectFileExtension);

						bool bAlreadyExisted;
						EngineProject = FindOrAddProject(ProjectFilePath, UnrealBuildTool.EngineDirectory, true, out bAlreadyExisted);

						EngineProject.IsForeignProject = false;
						EngineProject.IsGeneratedProject = true;
						EngineProject.IsStubProject = true;
					}

					if( EngineProject != null )
					{
						RootFolder.AddSubFolder( "Engine" ).ChildProjects.Add( EngineProject );

						// Engine config files
						if( bIncludeConfigFiles )
						{
							AddEngineConfigFiles( EngineProject );
							if( IncludeEnginePrograms )
							{
								AddUnrealHeaderToolConfigFiles(EngineProject);
								AddUBTConfigFilesToEngineProject(EngineProject);
							}
						}

						// Engine Extras files
						AddEngineExtrasFiles(EngineProject);

						// Engine localization files
						if( bIncludeLocalizationFiles )
						{
							AddEngineLocalizationFiles( EngineProject );
						}

						// Engine template files
						if (bIncludeTemplateFiles)
						{
							AddEngineTemplateFiles( EngineProject );
						}

						if( bIncludeShaderSource )
						{
							Log.TraceVerbose( "Adding shader source code..." );

							// Find shader source files and generate stub project
							AddEngineShaderSource( EngineProject );
						}

						if( bIncludeBuildSystemFiles )
						{
							Log.TraceVerbose( "Adding build system files..." );

							AddEngineBuildFiles( EngineProject );
						}

						if( bIncludeDocumentation )
						{
							AddEngineDocumentation( EngineProject );
						}

						List<Tuple<ProjectFile, string>> NewProjectFiles = EngineProject.WriteDebugProjectFiles(SupportedPlatforms, SupportedConfigurations, PlatformProjectGenerators);

						if (NewProjectFiles != null)
						{
							DebugProjectFiles.AddRange(NewProjectFiles);
						}
					}

					if (EnterpriseProject != null)
					{
						RootFolder.AddSubFolder(UnrealBuildTool.EnterpriseDirectory.GetDirectoryName()).ChildProjects.Add(EnterpriseProject);
					}

					foreach( ProjectFile CurModProject in ModProjects )
					{
						RootFolder.AddSubFolder("Mods").ChildProjects.Add(CurModProject);
					}

					DirectoryReference TemplatesDirectory = DirectoryReference.Combine(UnrealBuildTool.RootDirectory, "Templates");
					DirectoryReference SamplesDirectory = DirectoryReference.Combine(UnrealBuildTool.RootDirectory, "Samples");
					DirectoryReference EnterpriseTemplatesDirectory = DirectoryReference.Combine(UnrealBuildTool.EnterpriseDirectory, "Templates");
					DirectoryReference EnterpriseSamplesDirectory = DirectoryReference.Combine(UnrealBuildTool.EnterpriseDirectory, "Samples");

					foreach( ProjectFile CurGameProject in GameProjects )
					{
						// Templates go under a different solution folder than games
						FileReference UnrealProjectFile = CurGameProject.ProjectTargets.First().UnrealProjectFilePath;
						if (UnrealProjectFile.IsUnderDirectory(TemplatesDirectory) || UnrealProjectFile.IsUnderDirectory(EnterpriseTemplatesDirectory))
						{
							DirectoryReference TemplateGameDirectory = CurGameProject.BaseDir;
							if( TemplateGameDirectory.IsUnderDirectory((UnrealBuildTool.EnterpriseDirectory)) )
							{
								RootFolder.AddSubFolder(UnrealBuildTool.EnterpriseDirectory.GetDirectoryName() + Path.DirectorySeparatorChar + "Templates").ChildProjects.Add(CurGameProject);
							}
							else
							{
								RootFolder.AddSubFolder("Templates").ChildProjects.Add(CurGameProject);
							}
						}
						else if (UnrealProjectFile.IsUnderDirectory(SamplesDirectory) || UnrealProjectFile.IsUnderDirectory(EnterpriseSamplesDirectory))
						{
							DirectoryReference SampleGameDirectory = CurGameProject.BaseDir;
							if( SampleGameDirectory.IsUnderDirectory((UnrealBuildTool.EnterpriseDirectory)) )
                            {
								RootFolder.AddSubFolder(UnrealBuildTool.EnterpriseDirectory.GetDirectoryName() + Path.DirectorySeparatorChar + "Samples").ChildProjects.Add(CurGameProject);
							}
							else
							{
								RootFolder.AddSubFolder("Samples").ChildProjects.Add(CurGameProject);
							}
						}
						else
						{
							RootFolder.AddSubFolder( "Games" ).ChildProjects.Add( CurGameProject );
						}

						List<Tuple<ProjectFile, string>> NewProjectFiles = CurGameProject.WriteDebugProjectFiles(SupportedPlatforms, SupportedConfigurations, PlatformProjectGenerators);

						if (NewProjectFiles != null)
						{
							DebugProjectFiles.AddRange(NewProjectFiles);
						}

					}

					//Related Debug Project Files - Tuple has the related Debug Project, SolutionFolder
					foreach (Tuple<ProjectFile, string> DebugProjectFile in DebugProjectFiles)
					{						
						AddExistingProjectFile(DebugProjectFile.Item1, bForceDevelopmentConfiguration: false);

						//add it to the Android Debug Projects folder in the solution
						RootFolder.AddSubFolder(DebugProjectFile.Item2).ChildProjects.Add(DebugProjectFile.Item1);						
					}
					

					foreach( KeyValuePair<FileReference, ProjectFile> CurProgramProject in ProgramProjects )
					{
                        ProjectTarget Target = CurProgramProject.Value.ProjectTargets.FirstOrDefault(t => !String.IsNullOrEmpty(t.TargetRules.SolutionDirectory));

                        if (Target != null)
                        {
                            RootFolder.AddSubFolder(Target.TargetRules.SolutionDirectory).ChildProjects.Add(CurProgramProject.Value);
                        }
                        else
                        {
							if (CurProgramProject.Key.IsUnderDirectory(UnrealBuildTool.EnterpriseDirectory))
							{
								RootFolder.AddSubFolder(UnrealBuildTool.EnterpriseDirectory.GetDirectoryName() + Path.DirectorySeparatorChar + "Programs").ChildProjects.Add(CurProgramProject.Value);
							}
							else
							{
								RootFolder.AddSubFolder( "Programs" ).ChildProjects.Add( CurProgramProject.Value );
							}
                        }
					}

					// Add all of the config files for generated program targets
					AddEngineProgramConfigFiles( ProgramProjects );
				}
			}

			// Setup "stub" projects for all modules
			AddProjectsForAllModules(AllGameProjects, ProgramProjects, ModProjects, AllModuleFiles, bGatherThirdPartySource);

			{
				if( IncludeEnginePrograms )
				{
					MasterProjectFolder ProgramsFolder = RootFolder.AddSubFolder( "Programs" );

					// Add UnrealBuildTool to the master project
					AddUnrealBuildToolProject( ProgramsFolder );

					// Add AutomationTool to the master project
					ProgramsFolder.ChildProjects.Add(AddSimpleCSharpProject("AutomationTool", bShouldBuildForAllSolutionTargets: true, bForceDevelopmentConfiguration: true));

					// Add automation.csproj files to the master project
					AddAutomationModules(AllGameProjects, ProgramsFolder);

					// Discover C# programs which should additionally be included in the solution.
					DiscoverCSharpProgramProjects(ProgramsFolder);
                }


				// Eliminate all redundant master project folders.  E.g., folders which contain only one project and that project
				// has the same name as the folder itself.  To the user, projects "feel like" folders already in the IDE, so we
				// want to collapse them down where possible.
				EliminateRedundantMasterProjectSubFolders( RootFolder, "" );

				// Figure out which targets we need about IntelliSense for.  We only need to worry about targets for projects
				// that we're actually generating in this session.
				List<Tuple<ProjectFile, ProjectTarget>> IntelliSenseTargetFiles = new List<Tuple<ProjectFile, ProjectTarget>>();
				{
					// Engine targets
					if( EngineProject != null)
					{
						foreach( ProjectTarget ProjectTarget in EngineProject.ProjectTargets )
						{
							if( ProjectTarget.TargetFilePath != null )
							{
								// Only bother with the editor target.  We want to make sure that definitions are setup to be as inclusive as possible
								// for good quality IntelliSense.  For example, we want WITH_EDITORONLY_DATA=1, so using the editor targets works well.
								if( ProjectTarget.TargetRules.Type == TargetType.Editor )
								{ 
									IntelliSenseTargetFiles.Add( Tuple.Create(EngineProject, ProjectTarget) );
								}
							}
						}
					}

					// Enterprise targets
					if (EnterpriseProject != null)
					{
						foreach (ProjectTarget ProjectTarget in EnterpriseProject.ProjectTargets)
						{
							if (ProjectTarget.TargetFilePath != null)
							{
								// Only bother with the editor target.  We want to make sure that definitions are setup to be as inclusive as possible
								// for good quality IntelliSense.  For example, we want WITH_EDITORONLY_DATA=1, so using the editor targets works well.
								if (ProjectTarget.TargetRules.Type == TargetType.Editor)
								{
									IntelliSenseTargetFiles.Add(Tuple.Create(EnterpriseProject, ProjectTarget));
								}
							}
						}
					}

					// Program targets
					foreach( ProjectFile ProgramProject in ProgramProjects.Values )
					{
						foreach( ProjectTarget ProjectTarget in ProgramProject.ProjectTargets )
						{
							if( ProjectTarget.TargetFilePath != null )
							{
								IntelliSenseTargetFiles.Add( Tuple.Create( ProgramProject, ProjectTarget ) );
							}
						}
					}

					// Game/template targets
					foreach( ProjectFile GameProject in GameProjects )
					{
						foreach( ProjectTarget ProjectTarget in GameProject.ProjectTargets )
						{
							if( ProjectTarget.TargetFilePath != null )
							{
								// Only bother with the editor target.  We want to make sure that definitions are setup to be as inclusive as possible
								// for good quality IntelliSense.  For example, we want WITH_EDITORONLY_DATA=1, so using the editor targets works well.
								if( ProjectTarget.TargetRules.Type == TargetType.Editor )
								{ 
									IntelliSenseTargetFiles.Add( Tuple.Create( GameProject, ProjectTarget ) );
								}
							}
						}
					}
				}

				// write out any additional debug information for the solution (such as UnrealVS configuration)
				WriteDebugSolutionFiles(PlatformProjectGenerators, IntermediateProjectFilesPath);

				// Generate IntelliSense data if we need to.  This involves having UBT simulate the action compilation of
				// the targets so that we can extra the compiler defines, include paths, etc.
				GenerateIntelliSenseData(Arguments, IntelliSenseTargetFiles);

				// Write the project files
				WriteProjectFiles(PlatformProjectGenerators);
				Log.TraceVerbose( "Project generation complete ({0} generated, {1} imported)", GeneratedProjectFiles.Count, OtherProjectFiles.Count );
			}

			return bSuccess;
		}

		/// <summary>
		/// Adds detected UBT configuration files (BuildConfiguration.xml) to engine project.
		/// </summary>
		/// <param name="EngineProject">Engine project to add files to.</param>
		private void AddUBTConfigFilesToEngineProject(ProjectFile EngineProject)
		{
			EngineProject.AddAliasedFileToProject(new AliasedFile(
					XmlConfig.GetSchemaLocation().FullName,
					Path.Combine("Programs", "UnrealBuildTool")
				));

			List<XmlConfig.InputFile> InputFiles = XmlConfig.FindInputFiles();
			foreach(XmlConfig.InputFile InputFile in InputFiles)
			{
				EngineProject.AddAliasedFileToProject(
						new AliasedFile(
							InputFile.Location.FullName,
							Path.Combine("Config", "UnrealBuildTool", InputFile.FolderName)
						)
					);
			}
		}

		/// <summary>
		/// Clean project files
		/// </summary>
		/// <param name="InMasterProjectDirectory">The master project directory</param>
		/// <param name="InMasterProjectName">The name of the master project</param>
		/// <param name="InIntermediateProjectFilesDirectory">The intermediate path of project files</param>
		public abstract void CleanProjectFiles(DirectoryReference InMasterProjectDirectory, string InMasterProjectName, DirectoryReference InIntermediateProjectFilesDirectory);

		/// <summary>
		/// Configures project generator based on command-line options
		/// </summary>
		/// <param name="Arguments">Arguments passed into the program</param>
		/// <param name="IncludeAllPlatforms">True if all platforms should be included</param>
		protected virtual void ConfigureProjectFileGeneration( String[] Arguments, ref bool IncludeAllPlatforms )
		{
			bool bAlwaysIncludeEngineModules = false;
			foreach( string CurArgument in Arguments )
			{
				if( CurArgument.StartsWith( "-" ) )
				{
					if (CurArgument.StartsWith( "-Platforms=", StringComparison.InvariantCultureIgnoreCase ))
					{
						// Parse the list... will be in Foo+Bar+New format
						string PlatformList = CurArgument.Substring(11);
						while (PlatformList.Length > 0)
						{
							string PlatformString = PlatformList;
							Int32 PlusIdx = PlatformList.IndexOf("+");
							if (PlusIdx != -1)
							{
								PlatformString = PlatformList.Substring(0, PlusIdx);
								PlatformList = PlatformList.Substring(PlusIdx + 1);
							}
							else
							{
								// We are on the last platform... clear the list to exit the loop
								PlatformList = "";
							}

							// Is the string a valid platform? If so, add it to the list
							UnrealTargetPlatform SpecifiedPlatform = UnrealTargetPlatform.Unknown;
							foreach (UnrealTargetPlatform PlatformParam in Enum.GetValues(typeof(UnrealTargetPlatform)))
							{
								if (PlatformString.Equals(PlatformParam.ToString(), StringComparison.InvariantCultureIgnoreCase))
								{
									SpecifiedPlatform = PlatformParam;
									break;
								}
							}

							if (SpecifiedPlatform != UnrealTargetPlatform.Unknown)
							{
								if (ProjectPlatforms.Contains(SpecifiedPlatform) == false)
								{
									ProjectPlatforms.Add(SpecifiedPlatform);
								}
							}
							else
							{
								Log.TraceWarning("ProjectFiles invalid platform specified: {0}", PlatformString);
							}
						}
					}
					else switch( CurArgument.ToUpperInvariant() )
					{
						case "-ALLPLATFORMS":
							IncludeAllPlatforms = true;
							break;

						case "-CURRENTPLATFORM":
							IncludeAllPlatforms = false;
							break;

						case "-THIRDPARTY":
							bGatherThirdPartySource = true;
							break;
						
						case "-GAME":
							// Generates project files for a single game
							bGeneratingGameProjectFiles = true;
							break;

						case "-ENGINE":
							// Forces engine modules and targets to be included in game-specific project files
							bAlwaysIncludeEngineModules = true;
							break;

						case "-NOINTELLISENSE":
							bGenerateIntelliSenseData = false;
							break;

						case "-INTELLISENSE":
							bGenerateIntelliSenseData = true;
							break;

						case "-SHIPPINGCONFIGS":
							bIncludeTestAndShippingConfigs = true;
							break;

						case "-NOSHIPPINGCONFIGS":
							bIncludeTestAndShippingConfigs = false;
							break;

						case "-ALLLANGUAGES":
							bAllDocumentationLanguages = true;
							break;

						case "-USEPRECOMPILED":
							bUsePrecompiled = true;
							break;

						case "-VSCODE":
							bIncludeDotNETCoreProjects = true;
							break;
					}
				}
			}

			if( bGeneratingGameProjectFiles || UnrealBuildTool.IsEngineInstalled() )
			{
				if (OnlyGameProject == null)
				{
					throw new BuildException("A game project path was not specified, which is required when generating project files using an installed build or passing -game on the command line");
				}

				GameProjectName = OnlyGameProject.GetFileNameWithoutExtension();
				if (String.IsNullOrEmpty(GameProjectName))
				{
					throw new BuildException("A valid game project was not found in the specified location (" + OnlyGameProject.Directory.FullName + ")");
				}

				bool bInstalledEngineWithSource = UnrealBuildTool.IsEngineInstalled() && DirectoryReference.Exists(UnrealBuildTool.EngineSourceDirectory);

				bIncludeEngineSource = bAlwaysIncludeEngineModules || bInstalledEngineWithSource;
				bIncludeDocumentation = false;
				bIncludeBuildSystemFiles = false;
				bIncludeShaderSource = true;
				bIncludeTemplateFiles = false;
				bIncludeConfigFiles = true;
				IncludeEnginePrograms = bAlwaysIncludeEngineModules;
			}
			else
			{
				// At least one extra argument was specified, but we weren't expected it.  Ignored.
			}

			// If we're generating a solution for only one project, only include the enterprise folder if it's an enterprise project
			if(OnlyGameProject == null)
			{
				bIncludeEnterpriseSource = bIncludeEngineSource;
			}
			else
			{
				bIncludeEnterpriseSource = bIncludeEngineSource && ProjectDescriptor.FromFile(OnlyGameProject).IsEnterpriseProject;
			}
		}


		/// <summary>
		/// Adds all game project files, including target projects and config files
		/// </summary>
		private void AddAllGameProjects(List<ProjectFile> GameProjects, string SupportedPlatformNames, MasterProjectFolder ProjectsFolder)
		{
			HashSet<DirectoryReference> UniqueGameProjectDirectories = new HashSet<DirectoryReference>();
			foreach( ProjectFile GameProject in GameProjects )
			{
				DirectoryReference GameProjectDirectory = GameProject.BaseDir;
				if(UniqueGameProjectDirectories.Add(GameProjectDirectory))
				{
					// @todo projectfiles: We have engine localization files, but should we also add GAME localization files?

					GameProject.AddFilesToProject( SourceFileSearch.FindFiles( GameProjectDirectory, SearchSubdirectories: false ), GameProjectDirectory );

					// Game config files
					if( bIncludeConfigFiles )
					{
						DirectoryReference GameConfigDirectory = DirectoryReference.Combine(GameProjectDirectory, "Config");
						if( DirectoryReference.Exists(GameConfigDirectory) )
						{
							GameProject.AddFilesToProject( SourceFileSearch.FindFiles( GameConfigDirectory ), GameProjectDirectory );
						}
					}

					// Game build files
					if( bIncludeBuildSystemFiles )
					{
						DirectoryReference GameBuildDirectory = DirectoryReference.Combine(GameProjectDirectory, "Build");
						if( DirectoryReference.Exists(GameBuildDirectory) )
						{
							List<string> SubdirectoryNamesToExclude = new List<string>();
							SubdirectoryNamesToExclude.Add("Receipts");
							SubdirectoryNamesToExclude.Add("Scripts");
							SubdirectoryNamesToExclude.Add("FileOpenOrder");
							SubdirectoryNamesToExclude.Add("PipelineCaches");

							GameProject.AddFilesToProject( SourceFileSearch.FindFiles( GameBuildDirectory, SubdirectoryNamesToExclude ), GameProjectDirectory );
						}
					}

					DirectoryReference GameShaderDirectory = DirectoryReference.Combine(GameProjectDirectory, "Shaders");
					if (DirectoryReference.Exists(GameShaderDirectory))
					{
						GameProject.AddFilesToProject(SourceFileSearch.FindFiles(GameShaderDirectory), GameProjectDirectory);
					}
				}
            }
		}


		/// Adds all engine localization text files to the specified project
		private void AddEngineLocalizationFiles( ProjectFile EngineProject )
		{
			DirectoryReference EngineLocalizationDirectory = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Content", "Localization" );
			if( DirectoryReference.Exists(EngineLocalizationDirectory) )
			{
				EngineProject.AddFilesToProject( SourceFileSearch.FindFiles( EngineLocalizationDirectory ), UnrealBuildTool.EngineDirectory );
			}
		}


        /// Adds all engine template text files to the specified project
        private void AddEngineTemplateFiles( ProjectFile EngineProject )
        {
            DirectoryReference EngineTemplateDirectory = DirectoryReference.Combine(UnrealBuildTool.EngineDirectory, "Content", "Editor", "Templates");
            if (DirectoryReference.Exists(EngineTemplateDirectory))
            {
				EngineProject.AddFilesToProject( SourceFileSearch.FindFiles( EngineTemplateDirectory ), UnrealBuildTool.EngineDirectory );
			}
        }


		/// Adds all engine config files to the specified project
		private void AddEngineConfigFiles( ProjectFile EngineProject )
		{
            DirectoryReference EngineConfigDirectory = DirectoryReference.Combine(UnrealBuildTool.EngineDirectory, "Config" );
			if( DirectoryReference.Exists(EngineConfigDirectory) )
			{
				EngineProject.AddFilesToProject( SourceFileSearch.FindFiles( EngineConfigDirectory ), UnrealBuildTool.EngineDirectory );
			}
		}

		/// Adds all engine extras files to the specified project
		protected virtual void AddEngineExtrasFiles(ProjectFile EngineProject)
		{
		}

		/// Adds UnrealHeaderTool config files to the specified project
		private void AddUnrealHeaderToolConfigFiles(ProjectFile EngineProject)
		{
			DirectoryReference UHTConfigDirectory = DirectoryReference.Combine(UnrealBuildTool.EngineDirectory, "Programs", "UnrealHeaderTool", "Config");
			if (DirectoryReference.Exists(UHTConfigDirectory))
			{
				EngineProject.AddFilesToProject(SourceFileSearch.FindFiles(UHTConfigDirectory), UnrealBuildTool.EngineDirectory);
			}
		}

        /// <summary>
        /// Finds any additional plugin files.
        /// </summary>
        /// <returns>List of additional plugin files</returns>
		private List<FileReference> DiscoverExtraPlugins(List<FileReference> AllGameProjects)
		{
			List<FileReference> AddedPlugins = new List<FileReference>();

            foreach (FileReference GameProject in AllGameProjects)
			{
                // Check the user preference to see if they'd like to include nativized assets as a generated project.
                bool bIncludeNativizedAssets = false;
                ConfigHierarchy Config = ConfigCache.ReadHierarchy(ConfigHierarchyType.Game, GameProject.Directory, BuildHostPlatform.Current.Platform);
                if (Config != null)
                {
                    Config.TryGetValue("/Script/UnrealEd.ProjectPackagingSettings", "bIncludeNativizedAssetsInProjectGeneration", out bIncludeNativizedAssets);
                }

                // Note: Whether or not we include nativized assets here has no bearing on whether or not they actually get built.
                if (bIncludeNativizedAssets)
                {
                    AddedPlugins.AddRange(Plugins.EnumeratePlugins(DirectoryReference.Combine(GameProject.Directory, "Intermediate", "Plugins")).Where(x => x.GetFileNameWithoutExtension() == "NativizedAssets"));
                }
			}
			return AddedPlugins;
		}

		/// <summary>
		/// Finds all module files (filtering by platform)
		/// </summary>
		/// <returns>Filtered list of module files</returns>
		protected List<FileReference> DiscoverModules(List<FileReference> AllGameProjects)
		{
			List<FileReference> AllModuleFiles = new List<FileReference>();

			// Locate all modules (*.Build.cs files)
			List<FileReference> FoundModuleFiles = RulesCompiler.FindAllRulesSourceFiles( RulesCompiler.RulesFileType.Module, GameFolders: AllGameProjects.Select(x => x.Directory).ToList(), ForeignPlugins: DiscoverExtraPlugins(AllGameProjects), AdditionalSearchPaths:null );
			foreach( FileReference BuildFileName in FoundModuleFiles )
			{
				AllModuleFiles.Add( BuildFileName );
			}
			return AllModuleFiles;
		}

		/// <summary>
		/// List of non-redistributable folders
		/// </summary>
		private static string[] NoRedistFolders = new string[]
		{
			Path.DirectorySeparatorChar + "NoRedist" + Path.DirectorySeparatorChar,
			Path.DirectorySeparatorChar + "NotForLicensees" + Path.DirectorySeparatorChar
		};

		/// <summary>
		/// Checks if a module is in a non-redistributable folder
		/// </summary>
		private static bool IsNoRedistModule(FileReference ModulePath)
		{
			foreach (string NoRedistFolderName in NoRedistFolders)
			{
				if (ModulePath.FullName.IndexOf(NoRedistFolderName, StringComparison.InvariantCultureIgnoreCase) >= 0)
				{
					return true;
				}
			}
			return false;
		}

		/// <summary>
		/// Finds all target files (filtering by platform)
		/// </summary>
		/// <returns>Filtered list of target files</returns>
		protected List<FileReference> DiscoverTargets(List<FileReference> AllGameProjects)
		{
			List<FileReference> AllTargetFiles = new List<FileReference>();

			// Make a list of all platform name strings that we're *not* including in the project files
			List<string> UnsupportedPlatformNameStrings = Utils.MakeListOfUnsupportedPlatforms( SupportedPlatforms );

			// Locate all targets (*.Target.cs files)
			List<FileReference> FoundTargetFiles = RulesCompiler.FindAllRulesSourceFiles( RulesCompiler.RulesFileType.Target, AllGameProjects.Select(x => x.Directory).ToList(), ForeignPlugins: DiscoverExtraPlugins(AllGameProjects), AdditionalSearchPaths:null );
			foreach( FileReference CurTargetFile in FoundTargetFiles )
			{
				string CleanTargetFileName = Utils.CleanDirectorySeparators( CurTargetFile.FullName );

				// remove the local root
				string LocalRoot = UnrealBuildTool.RootDirectory.FullName;
				string Search = CleanTargetFileName;
				if (Search.StartsWith(LocalRoot, StringComparison.InvariantCultureIgnoreCase))
				{
					if (LocalRoot.EndsWith("\\") || LocalRoot.EndsWith("/"))
					{
						Search = Search.Substring(LocalRoot.Length - 1);
					}
					else
					{
						Search = Search.Substring(LocalRoot.Length);
					}
				}

				if (OnlyGameProject != null)
				{
					string ProjectRoot = OnlyGameProject.Directory.FullName;
					if (Search.StartsWith(ProjectRoot, StringComparison.InvariantCultureIgnoreCase))
					{
						if (ProjectRoot.EndsWith("\\") || ProjectRoot.EndsWith("/"))
						{
							Search = Search.Substring(ProjectRoot.Length - 1);
						}
						else
						{
							Search = Search.Substring(ProjectRoot.Length);
						}
					}
				}

				// Skip targets in unsupported platform directories
				bool IncludeThisTarget = true;
				foreach( string CurPlatformName in UnsupportedPlatformNameStrings )
				{
					if (Search.IndexOf(Path.DirectorySeparatorChar + CurPlatformName + Path.DirectorySeparatorChar, StringComparison.InvariantCultureIgnoreCase) != -1)
					{
						IncludeThisTarget = false;
						break;
					}
				}

				if( IncludeThisTarget )
				{
					AllTargetFiles.Add( CurTargetFile );
				}
			}

			return AllTargetFiles;
		}


	
		/// <summary>
		/// Recursively collapses all sub-folders that are redundant.  Should only be called after we're done adding
		/// files and projects to the master project.
		/// </summary>
		/// <param name="Folder">The folder whose sub-folders we should potentially collapse into</param>
		/// <param name="ParentMasterProjectFolderPath"></param>
		void EliminateRedundantMasterProjectSubFolders( MasterProjectFolder Folder, string ParentMasterProjectFolderPath )
		{
			// NOTE: This is for diagnostics output only
			string MasterProjectFolderPath = String.IsNullOrEmpty( ParentMasterProjectFolderPath ) ? Folder.FolderName : ( ParentMasterProjectFolderPath + "/" + Folder.FolderName );

			// We can eliminate folders that meet all of these requirements:
			//		1) Have only a single project file in them
			//		2) Have no files in the folder except project files, and no sub-folders
			//		3) The project file matches the folder name
			//
			// Additionally, if KeepSourceSubDirectories==false, we can eliminate directories called "Source".
			//
			// Also, we can kill folders that are completely empty.
			

			foreach( MasterProjectFolder SubFolder in Folder.SubFolders )
			{
				// Recurse
				EliminateRedundantMasterProjectSubFolders( SubFolder, MasterProjectFolderPath );
			}

			List<MasterProjectFolder> SubFoldersToAdd = new List<MasterProjectFolder>();
			List<MasterProjectFolder> SubFoldersToRemove = new List<MasterProjectFolder>();
			foreach( MasterProjectFolder SubFolder in Folder.SubFolders )
			{
				bool CanCollapseFolder = false;

				// 1)
				if( SubFolder.ChildProjects.Count == 1 )
				{
					// 2)
					if( SubFolder.Files.Count == 0 &&
						SubFolder.SubFolders.Count == 0 )
					{
						// 3)
						if (SubFolder.FolderName.Equals(SubFolder.ChildProjects[0].ProjectFilePath.GetFileNameWithoutAnyExtensions(), StringComparison.InvariantCultureIgnoreCase))
						{
							CanCollapseFolder = true;
						}
					}
				}

				if( !bKeepSourceSubDirectories )
				{
					if( SubFolder.FolderName.Equals( "Source", StringComparison.InvariantCultureIgnoreCase ) )
					{
						// Avoid collapsing the Engine's Source directory, since there are so many other solution folders in
						// the parent directory.
						if( !Folder.FolderName.Equals( "Engine", StringComparison.InvariantCultureIgnoreCase ) )
						{
							CanCollapseFolder = true;
						}
					}
				}

				if( SubFolder.ChildProjects.Count == 0 && SubFolder.Files.Count == 0 && SubFolder.SubFolders.Count == 0 )
				{
					// Folder is totally empty
					CanCollapseFolder = true;
				}

				if( CanCollapseFolder )
				{
					// OK, this folder is redundant and can be collapsed away.

					SubFoldersToAdd.AddRange( SubFolder.SubFolders );
					SubFolder.SubFolders.Clear();

					Folder.ChildProjects.AddRange( SubFolder.ChildProjects );
					SubFolder.ChildProjects.Clear();

					Folder.Files.AddRange( SubFolder.Files );
					SubFolder.Files.Clear();

					SubFoldersToRemove.Add( SubFolder );
				}
			}

			foreach( MasterProjectFolder SubFolderToRemove in SubFoldersToRemove )
			{
				Folder.SubFolders.Remove( SubFolderToRemove );
			}
			Folder.SubFolders.AddRange( SubFoldersToAdd );

			// After everything has been collapsed, do a bit of data validation
			Validate(Folder, ParentMasterProjectFolderPath);
		}

		/// <summary>
		/// Validate the specified Folder. Default implementation requires
		/// for project file names to be unique!
		/// </summary>
		/// <param name="Folder">Folder.</param>
		/// <param name="MasterProjectFolderPath">Parent master project folder path.</param>
		protected virtual void Validate(MasterProjectFolder Folder, string MasterProjectFolderPath)
		{
			foreach (ProjectFile CurChildProject in Folder.ChildProjects)
			{
				foreach (ProjectFile OtherChildProject in Folder.ChildProjects)
				{
					if (CurChildProject != OtherChildProject)
					{
						if (CurChildProject.ProjectFilePath.GetFileNameWithoutAnyExtensions().Equals(OtherChildProject.ProjectFilePath.GetFileNameWithoutAnyExtensions(), StringComparison.InvariantCultureIgnoreCase))
						{
							throw new BuildException("Detected collision between two project files with the same path in the same master project folder, " + OtherChildProject.ProjectFilePath.FullName + " and " + CurChildProject.ProjectFilePath.FullName + " (master project folder: " + MasterProjectFolderPath + ")");
						}
					}
				}
			}

			foreach (MasterProjectFolder SubFolder in Folder.SubFolders)
			{
				// If the parent folder already has a child project or file item with the same name as this sub-folder, then
				// that's considered an error (it should never have been allowed to have a folder name that collided
				// with project file names or file items, as that's not supported in Visual Studio.)
				foreach (ProjectFile CurChildProject in Folder.ChildProjects)
				{
					if (CurChildProject.ProjectFilePath.GetFileNameWithoutAnyExtensions().Equals(SubFolder.FolderName, StringComparison.InvariantCultureIgnoreCase))
					{
						throw new BuildException("Detected collision between a master project sub-folder " + SubFolder.FolderName + " and a project within the outer folder " + CurChildProject.ProjectFilePath + " (master project folder: " + MasterProjectFolderPath + ")");
					}
				}
				foreach (string CurFile in Folder.Files)
				{
					if (Path.GetFileName(CurFile).Equals(SubFolder.FolderName, StringComparison.InvariantCultureIgnoreCase))
					{
						throw new BuildException("Detected collision between a master project sub-folder " + SubFolder.FolderName + " and a file within the outer folder " + CurFile + " (master project folder: " + MasterProjectFolderPath + ")");
					}
				}
				foreach (MasterProjectFolder CurFolder in Folder.SubFolders)
				{
					if (CurFolder != SubFolder)
					{
						if (CurFolder.FolderName.Equals(SubFolder.FolderName, StringComparison.InvariantCultureIgnoreCase))
						{
							throw new BuildException("Detected collision between a master project sub-folder " + SubFolder.FolderName + " and a sibling folder " + CurFolder.FolderName + " (master project folder: " + MasterProjectFolderPath + ")");
						}
					}
				}
			}
		}

		/// <summary>
		/// Adds UnrealBuildTool to the master project
		/// </summary>
		private void AddUnrealBuildToolProject(MasterProjectFolder ProgramsFolder)
		{
			List<string> ProjectDirectoryNames = new List<string>();
			ProjectDirectoryNames.Add("UnrealBuildTool");

			if (AllowDotNetCoreProjects)
			{
				ProjectDirectoryNames.Add("UnrealBuildTool_NETCore");
			}

			foreach (string ProjectDirectoryName in ProjectDirectoryNames)
			{
				DirectoryReference ProjectDirectory = DirectoryReference.Combine(UnrealBuildTool.EngineSourceDirectory, "Programs", ProjectDirectoryName);
				if (DirectoryReference.Exists(ProjectDirectory))
				{
					FileReference ProjectFileName = FileReference.Combine(ProjectDirectory, "UnrealBuildTool.csproj");

					if (FileReference.Exists(ProjectFileName))
					{
						VCSharpProjectFile UnrealBuildToolProject = new VCSharpProjectFile(ProjectFileName);
						UnrealBuildToolProject.ShouldBuildForAllSolutionTargets = true;

						if (bIncludeDotNETCoreProjects || !UnrealBuildToolProject.IsDotNETCoreProject())
						{
							if (!UnrealBuildToolProject.IsDotNETCoreProject())
							{
								// Store it off as we need it when generating target projects.
								UBTProject = UnrealBuildToolProject;
							}

							// Add the project
							AddExistingProjectFile(UnrealBuildToolProject, bNeedsAllPlatformAndConfigurations: true, bForceDevelopmentConfiguration: true);

							// Put this in a solution folder
							ProgramsFolder.ChildProjects.Add(UnrealBuildToolProject);
						}
					}
				}
			}
		}

		/// <summary>
		/// Adds a C# project to the master project
		/// </summary>
		/// <param name="ProjectName">Name of project file to add</param>
		/// <param name="bShouldBuildForAllSolutionTargets"></param>
		/// <param name="bForceDevelopmentConfiguration"></param>
		/// <param name="bShouldBuildByDefaultForSolutionTargets"></param>
		/// <returns>ProjectFile if the operation was successful, otherwise null.</returns>
		private VCSharpProjectFile AddSimpleCSharpProject(string ProjectName, bool bShouldBuildForAllSolutionTargets = false, bool bForceDevelopmentConfiguration = false, bool bShouldBuildByDefaultForSolutionTargets = true)
		{
			VCSharpProjectFile Project = null;

			FileReference ProjectFileName = FileReference.Combine( UnrealBuildTool.EngineSourceDirectory, "Programs", ProjectName, Path.GetFileName( ProjectName ) + ".csproj" );
			FileInfo Info = new FileInfo( ProjectFileName.FullName );
			if( Info.Exists )
			{
				Project = new VCSharpProjectFile(ProjectFileName);
				Project.ShouldBuildForAllSolutionTargets = bShouldBuildForAllSolutionTargets;
				Project.ShouldBuildByDefaultForSolutionTargets = bShouldBuildByDefaultForSolutionTargets;
				AddExistingProjectFile(Project, bForceDevelopmentConfiguration: bForceDevelopmentConfiguration);
			}
			else
			{
				throw new BuildException( ProjectFileName.FullName + " doesn't exist!" );
			}

			return Project;
		}

		/// <summary>
		/// Check the registry for MVC3 project support
		/// </summary>
		/// <param name="RootKey"></param>
		/// <param name="VisualStudioVersion"></param>
		/// <returns></returns>
		private bool CheckRegistryKey( RegistryKey RootKey, string VisualStudioVersion )
		{
			bool bInstalled = false;
			RegistryKey VSSubKey = RootKey.OpenSubKey( "SOFTWARE\\Microsoft\\VisualStudio\\" + VisualStudioVersion + "\\Projects\\{E53F8FEA-EAE0-44A6-8774-FFD645390401}" );
			if( VSSubKey != null )
			{
				bInstalled = true;
				VSSubKey.Close();
			}

			return bInstalled;
		}

		/// <summary>
		/// Check to see if a Visual Studio Extension is installed
		/// </summary>
		/// <param name="VisualStudioFolder"></param>
		/// <param name="VisualStudioVersion"></param>
		/// <param name="Extension"></param>
		/// <returns></returns>
		private bool CheckVisualStudioExtensionPackage( string VisualStudioFolder, string VisualStudioVersion, string Extension )
		{
			DirectoryInfo DirInfo = new DirectoryInfo( Path.Combine( VisualStudioFolder, VisualStudioVersion, "Extensions" ) );
			if( DirInfo.Exists )
			{
				List<FileInfo> PackageDefs = DirInfo.GetFiles( "*.pkgdef", SearchOption.AllDirectories ).ToList();
				List<string> PackageDefNames = PackageDefs.Select( x => x.Name ).ToList();
				if( PackageDefNames.Contains( Extension ) )
				{
					return true;
				}
			}

			return false;
		}

		/// <summary>
		/// Adds all of the config files for program targets to their project files
		/// </summary>
		private void AddEngineProgramConfigFiles( Dictionary<FileReference, ProjectFile> ProgramProjects )
		{
			if( bIncludeConfigFiles )
			{
				foreach( KeyValuePair<FileReference, ProjectFile> FileAndProject in ProgramProjects )
				{
					string ProgramName = FileAndProject.Key.GetFileNameWithoutAnyExtensions();
					ProjectFile ProgramProjectFile = FileAndProject.Value;

					// @todo projectfiles: The config folder for programs is kind of weird -- you end up going UP a few directories to get to it.  This stuff is not great.
					// @todo projectfiles: Fragile assumption here about Programs always being under /Engine/Programs

					DirectoryReference ProgramDirectory;

                    if ( FileAndProject.Key.IsUnderDirectory(UnrealBuildTool.EnterpriseDirectory) )
					{
						ProgramDirectory = DirectoryReference.Combine( UnrealBuildTool.EnterpriseDirectory, "Programs", ProgramName );
					}
					else
					{
						ProgramDirectory = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Programs", ProgramName );
					}

					DirectoryReference ProgramConfigDirectory = DirectoryReference.Combine( ProgramDirectory, "Config" );
					if( DirectoryReference.Exists(ProgramConfigDirectory) )
					{
						ProgramProjectFile.AddFilesToProject( SourceFileSearch.FindFiles( ProgramConfigDirectory ), ProgramDirectory );
					}
				}
			}
		}

		/// <summary>
		/// Generates data for IntelliSense (compile definitions, include paths)
		/// </summary>
		/// <param name="Arguments">Incoming command-line arguments to UBT</param>
		/// <param name="Targets">Targets to build for intellisense</param>
		/// <return>Whether the process was successful or not</return>
		private void GenerateIntelliSenseData(string[] Arguments, List<Tuple<ProjectFile, ProjectTarget>> Targets)
		{
			if(ShouldGenerateIntelliSenseData() && Targets.Count > 0)
			{
				string ProgressInfoText = Utils.IsRunningOnMono ? "Generating data for project indexing..." : "Binding IntelliSense data...";
				using(ProgressWriter Progress = new ProgressWriter(ProgressInfoText, true))
				{
					for(int TargetIndex = 0; TargetIndex < Targets.Count; ++TargetIndex)
					{
						ProjectFile TargetProjectFile = Targets[ TargetIndex ].Item1;
						ProjectTarget CurTarget = Targets[ TargetIndex ].Item2;

						Log.TraceVerbose("Found target: " + CurTarget.Name);

						List<string> NewArguments = new List<string>(Arguments.Length + 4);
						if(CurTarget.TargetRules.Type != TargetType.Program)
						{
							NewArguments.Add("-precompile");
						}
						NewArguments.AddRange(Arguments);

						try
						{
							// Get the architecture from the target platform
							string DefaultArchitecture = UEBuildPlatform.GetBuildPlatform(BuildHostPlatform.Current.Platform).GetDefaultArchitecture(CurTarget.UnrealProjectFilePath);

							// Create the target descriptor
							TargetDescriptor TargetDesc = new TargetDescriptor(CurTarget.UnrealProjectFilePath, CurTarget.Name, BuildHostPlatform.Current.Platform, UnrealTargetConfiguration.Development, DefaultArchitecture, new CommandLineArguments(NewArguments.ToArray()));

							// Create the target
							UEBuildTarget Target = UEBuildTarget.Create(TargetDesc, false, bUsePrecompiled);

							// Generate a compile environment for each module in the binary
							CppCompileEnvironment GlobalCompileEnvironment = Target.CreateCompileEnvironmentForProjectFiles();
							foreach(UEBuildBinary Binary in Target.Binaries)
							{
								CppCompileEnvironment BinaryCompileEnvironment = Binary.CreateBinaryCompileEnvironment(GlobalCompileEnvironment);
								foreach(UEBuildModuleCPP Module in Binary.Modules.OfType<UEBuildModuleCPP>())
								{
									ProjectFile ProjectFileForIDE;
									if (ModuleToProjectFileMap.TryGetValue(Module.Name, out ProjectFileForIDE) && ProjectFileForIDE == TargetProjectFile)
									{
										CppCompileEnvironment ModuleCompileEnvironment = Module.CreateModuleCompileEnvironment(Target.Rules, BinaryCompileEnvironment);
										ProjectFileForIDE.AddIntelliSensePreprocessorDefinitions(ModuleCompileEnvironment.Definitions);
										ProjectFileForIDE.AddIntelliSenseIncludePaths(ModuleCompileEnvironment.SystemIncludePaths, true);
										ProjectFileForIDE.AddIntelliSenseIncludePaths(ModuleCompileEnvironment.UserIncludePaths, false);
									}
								}
							}

							// If we're generating project files, then go ahead and wipe out the existing UBTMakefile for every target, to make sure that
							// it gets a full dependency scan next time.
							// NOTE: This is just a safeguard and doesn't have to be perfect.  We also check for newer project file timestamps in LoadUBTMakefile()
							FileReference MakefileLocation = TargetMakefile.GetLocation(TargetDesc.ProjectFile, TargetDesc.Name, TargetDesc.Platform, TargetDesc.Configuration);
							if (FileReference.Exists(MakefileLocation))
							{
								FileReference.Delete(MakefileLocation);
							}
						}
						catch(Exception Ex)
						{
							Log.TraceWarning("Exception while generating include data for {0}: {1}", CurTarget.Name, Ex.ToString());
						}

						// Display progress
						Progress.Write(TargetIndex + 1, Targets.Count);
					}
				}
			}
		}


		/// <summary>
		/// Selects which platforms and build configurations we want in the project file
		/// </summary>
		/// <param name="IncludeAllPlatforms">True if we should include ALL platforms that are supported on this machine.  Otherwise, only desktop platforms will be included.</param>
		/// <param name="SupportedPlatformNames">Output string for supported platforms, returned as comma-separated values.</param>
		protected virtual void SetupSupportedPlatformsAndConfigurations(bool IncludeAllPlatforms, out string SupportedPlatformNames)
		{
			StringBuilder SupportedPlatformsString = new StringBuilder();

			System.Array PlatformEnums = Enum.GetValues(typeof(UnrealTargetPlatform));
			foreach (UnrealTargetPlatform Platform in PlatformEnums)
			{
				// project is in the explicit platform list or we include them all, we add the valid desktop platforms as they are required
				bool bInProjectPlatformsList = (ProjectPlatforms.Count > 0) ? (IsValidDesktopPlatform(Platform) || ProjectPlatforms.Contains(Platform)) : true;

				// project is a desktop platform or we have specified some platforms explicitly
				bool IsRequiredPlatform = (IsValidDesktopPlatform(Platform) || ProjectPlatforms.Count > 0);

				// Only include desktop platforms unless we were explicitly asked to include all platforms or restricted to a single platform.
				if (bInProjectPlatformsList && (IncludeAllPlatforms || IsRequiredPlatform))
				{
					// If there is a build platform present, add it to the SupportedPlatforms list
					UEBuildPlatform BuildPlatform = UEBuildPlatform.GetBuildPlatform( Platform, true );
					if( BuildPlatform != null )
					{
						if (InstalledPlatformInfo.IsValidPlatform(Platform, EProjectType.Code))
						{
							SupportedPlatforms.Add(Platform);

							if (SupportedPlatformsString.Length > 0)
							{
								SupportedPlatformsString.Append(", ");
							}
							SupportedPlatformsString.Append(Platform.ToString());
						}
					}
				}
			}

			// Add all configurations
			foreach( UnrealTargetConfiguration CurConfiguration in Enum.GetValues( typeof(UnrealTargetConfiguration) ) )
			{
				if( CurConfiguration != UnrealTargetConfiguration.Unknown )
				{
					if (InstalledPlatformInfo.IsValidConfiguration(CurConfiguration, EProjectType.Code))
					{
						SupportedConfigurations.Add(CurConfiguration);
					}
				}
			}

			SupportedPlatformNames = SupportedPlatformsString.ToString();
		}

		/// <summary>
		/// Is this a valid platform. Used primarily for Installed vs non-Installed builds.
		/// </summary>
		/// <param name="InPlatform"></param>
		/// <returns>true if valid, false if not</returns>
		static public bool IsValidDesktopPlatform(UnrealTargetPlatform InPlatform)
		{
			switch (BuildHostPlatform.Current.Platform)
			{
				case UnrealTargetPlatform.Linux:
					return InPlatform == UnrealTargetPlatform.Linux;
				case UnrealTargetPlatform.Mac:
					return InPlatform == UnrealTargetPlatform.Mac;
				case UnrealTargetPlatform.Win64:
					return ((InPlatform == UnrealTargetPlatform.Win32) || (InPlatform == UnrealTargetPlatform.Win64));
				default:
					throw new BuildException("Invalid RuntimePlatform:" + BuildHostPlatform.Current.Platform);
			}
		}

		/// <summary>
		/// Find the game which contains a given input file.
		/// </summary>
		/// <param name="AllGames">All game folders</param>
		/// <param name="File">Full path of the file to search for</param>
		protected FileReference FindGameContainingFile(List<FileReference> AllGames, FileReference File)
		{
			foreach (FileReference Game in AllGames)
			{
				if (File.IsUnderDirectory(Game.Directory))
				{
					return Game;
				}
			}
			return null;
		}

		/// <summary>
		/// Finds all modules and code files, given a list of games to process
		/// </summary>
		/// <param name="AllGames">All game folders</param>
		/// <param name="ProgramProjects">All program projects</param>
		/// <param name="ModProjects">All mod projects</param>
		/// <param name="AllModuleFiles">List of *.Build.cs files for all engine programs and games</param>
		/// <param name="bGatherThirdPartySource">True to gather source code from third party projects too</param>
		protected void AddProjectsForAllModules( List<FileReference> AllGames, Dictionary<FileReference, ProjectFile> ProgramProjects, List<ProjectFile> ModProjects, List<FileReference> AllModuleFiles, bool bGatherThirdPartySource )
		{
			HashSet<ProjectFile> ProjectsWithPlugins = new HashSet<ProjectFile>();
			foreach( FileReference CurModuleFile in AllModuleFiles )
			{
				Log.TraceVerbose("AddProjectsForAllModules " + CurModuleFile);

				// The module's "base directory" is simply the directory where its xxx.Build.cs file is stored.  We'll always
				// harvest source files for this module in this base directory directory and all of its sub-directories.
				string ModuleName = CurModuleFile.GetFileNameWithoutAnyExtensions();		// Remove both ".cs" and ".Build"

				bool WantProjectFileForModule = true;

				// We'll keep track of whether this is an "engine" or "external" module.  This is determined below while loading module rules.
				bool IsEngineModule = UnrealBuildTool.IsUnderAnEngineDirectory(CurModuleFile.Directory);
				bool IsThirdPartyModule = CurModuleFile.IsUnderDirectory(UnrealBuildTool.EngineSourceThirdPartyDirectory);

				if( IsEngineModule && !bIncludeEngineSource )
				{
					// We were asked to exclude engine modules from the generated projects
					WantProjectFileForModule = false;
				}

				if( CurModuleFile.IsUnderDirectory(UnrealBuildTool.EnterpriseDirectory) && !bIncludeEnterpriseSource )
				{
					// We were asked to exclude enterprise modules from the generated projects
					WantProjectFileForModule = false;
				}

				if( WantProjectFileForModule )
				{
					DirectoryReference BaseFolder;
					ProjectFile ProjectFile = FindProjectForModule(CurModuleFile, AllGames, ProgramProjects, ModProjects, out BaseFolder);

					// Update our module map
					ModuleToProjectFileMap[ ModuleName ] = ProjectFile;
					ProjectFile.IsGeneratedProject = true;

					// Only search subdirectories for non-external modules.  We don't want to add all of the source and header files
					// for every third-party module, unless we were configured to do so.
					bool SearchSubdirectories = !IsThirdPartyModule || bGatherThirdPartySource;

					if( bGatherThirdPartySource )
					{
						Log.TraceInformation( "Searching for third-party source files..." );
					}


					// Find all of the source files (and other files) and add them to the project
					List<FileReference> FoundFiles = SourceFileSearch.FindModuleSourceFiles( CurModuleFile, SearchSubdirectories:SearchSubdirectories );
					ProjectFile.AddFilesToProject( FoundFiles, BaseFolder );

					// Check if there's a plugin directory here
					if(!ProjectsWithPlugins.Contains(ProjectFile))
					{
						DirectoryReference PluginFolder = DirectoryReference.Combine(BaseFolder, "Plugins");
						if(DirectoryReference.Exists(PluginFolder))
						{
							// Add all the plugin files for this project
							foreach(FileReference PluginFileName in Plugins.EnumeratePlugins(PluginFolder))
							{
								if(!ModProjects.Any(x => x.BaseDir == PluginFileName.Directory))
								{
									AddPluginFilesToProject(PluginFileName, BaseFolder, ProjectFile);
								}
							}
						}
						ProjectsWithPlugins.Add(ProjectFile);
					}
				}
			}
		}

		private void AddPluginFilesToProject(FileReference PluginFileName, DirectoryReference BaseFolder, ProjectFile ProjectFile)
		{
			// Add the .uplugin file
			ProjectFile.AddFileToProject(PluginFileName, BaseFolder);

			// Add plugin config files if we have any
			if( bIncludeConfigFiles )
			{
				DirectoryReference PluginConfigFolder = DirectoryReference.Combine(PluginFileName.Directory, "Config");
				if(DirectoryReference.Exists(PluginConfigFolder))
				{
					ProjectFile.AddFilesToProject(SourceFileSearch.FindFiles(PluginConfigFolder), BaseFolder );
				}
			}

			// Add plugin "resource" files if we have any
			DirectoryReference PluginResourcesFolder = DirectoryReference.Combine(PluginFileName.Directory, "Resources");
			if(DirectoryReference.Exists(PluginResourcesFolder))
			{
				ProjectFile.AddFilesToProject(SourceFileSearch.FindFiles(PluginResourcesFolder), BaseFolder );
            }

            // Add plugin shader files if we have any
            DirectoryReference PluginShadersFolder = DirectoryReference.Combine(PluginFileName.Directory, "Shaders");
            if (DirectoryReference.Exists(PluginShadersFolder))
            {
                ProjectFile.AddFilesToProject(SourceFileSearch.FindFiles(PluginShadersFolder), BaseFolder);
            }
        }

		private ProjectFile FindProjectForModule(FileReference CurModuleFile, List<FileReference> AllGames, Dictionary<FileReference, ProjectFile> ProgramProjects, List<ProjectFile> ModProjects, out DirectoryReference BaseFolder)
		{
			string ProjectFileNameBase = null;

			string PossibleProgramTargetName = CurModuleFile.GetFileNameWithoutAnyExtensions();

			// @todo projectfiles: This works fine for now, but is pretty busted.  It assumes only one module per program and that it matches the program target file name. (see TTP 307091)
			if( ProgramProjects != null && ProgramProjects.Any( ProgramProject => PossibleProgramTargetName.Equals( ProgramProject.Key.GetFileNameWithoutAnyExtensions() ) ) )	// @todo projectfiles: When building (in mem projects), ProgramProjects will be null so we are using the UE4 project instead
			{
				ProjectFileNameBase = PossibleProgramTargetName;
				BaseFolder = CurModuleFile.Directory;
			}
			else if( CurModuleFile.IsUnderDirectory(UnrealBuildTool.EngineDirectory) )
			{
				ProjectFileNameBase = EngineProjectFileNameBase;
				BaseFolder = UnrealBuildTool.EngineDirectory;
			}
			else if( CurModuleFile.IsUnderDirectory(UnrealBuildTool.EnterpriseSourceDirectory) ||
				CurModuleFile.IsUnderDirectory(DirectoryReference.Combine(UnrealBuildTool.EnterpriseDirectory, "Plugins")) )
			{
				ProjectFileNameBase = EnterpriseProjectFileNameBase;
				BaseFolder = UnrealBuildTool.EnterpriseDirectory;
			}
			else
			{
				// Check if it's a mod
				foreach(ProjectFile ModProject in ModProjects)
				{
					if(CurModuleFile.IsUnderDirectory(ModProject.BaseDir))
					{
						BaseFolder = ModProject.BaseDir;
						return ModProject;
					}
				}

				// Figure out which game project this target belongs to
				FileReference ProjectInfo = FindGameContainingFile(AllGames, CurModuleFile);
				if(ProjectInfo == null)
				{
					throw new BuildException( "Found a non-engine module file (" + CurModuleFile + ") that did not exist within any of the known game folders" );
				}
				BaseFolder = ProjectInfo.Directory;
				ProjectFileNameBase = ProjectInfo.GetFileNameWithoutExtension();
			}

			// Setup a project file entry for this module's project.  Remember, some projects may host multiple modules!
			FileReference ProjectFileName = FileReference.Combine( IntermediateProjectFilesPath, ProjectFileNameBase + ProjectFileExtension );
			bool bProjectAlreadyExisted;
			return FindOrAddProject( ProjectFileName, BaseFolder, IncludeInGeneratedProjects:true, bAlreadyExisted:out bProjectAlreadyExisted );
		}

		/// <summary>
		/// Creates project entries for all known targets (*.Target.cs files)
		/// </summary>
		/// <param name="PlatformProjectGenerators">The registered platform project generators</param>
		/// <param name="AllGames">All game folders</param>
		/// <param name="EngineProject">The engine project we created</param>
		/// <param name="EnterpriseProject">The enterprise project we created</param>
		/// <param name="GameProjects">Map of game folder name to all of the game projects we created</param>
		/// <param name="ProgramProjects">Map of program names to all of the program projects we created</param>
		private void AddProjectsForAllTargets( 
			PlatformProjectGeneratorCollection PlatformProjectGenerators, 
			List<FileReference> AllGames, 
			out ProjectFile EngineProject, 
			out ProjectFile EnterpriseProject,
			out List<ProjectFile> GameProjects, 
			out Dictionary<FileReference, ProjectFile> ProgramProjects)
		{
			// As we're creating project files, we'll also keep track of whether we created an "engine" project and return that if we have one
			EngineProject = null;
			EnterpriseProject = null;
			GameProjects = new List<ProjectFile>();
			ProgramProjects = new Dictionary<FileReference, ProjectFile>();

			// Get some standard directories
			DirectoryReference EngineSourceProgramsDirectory = DirectoryReference.Combine(UnrealBuildTool.EngineSourceDirectory, "Programs");
			DirectoryReference EnterpriseSourceProgramsDirectory = DirectoryReference.Combine(UnrealBuildTool.EnterpriseSourceDirectory, "Programs");

			// Find all of the target files.  This will filter out any modules or targets that don't
			// belong to platforms we're generating project files for.
			List<FileReference> AllTargetFiles = DiscoverTargets(AllGames);

			// Sort the targets by name. When we have multiple targets of a given type for a project, we'll use the order to determine which goes in the primary project file (so that client names with a suffix will go into their own project).
			AllTargetFiles = AllTargetFiles.OrderBy(x => x.FullName, StringComparer.OrdinalIgnoreCase).ToList();

			foreach( FileReference TargetFilePath in AllTargetFiles )
			{
				string TargetName = TargetFilePath.GetFileNameWithoutAnyExtensions();		// Remove both ".cs" and ".Target"

				// Check to see if this is an Engine target.  That is, the target is located under the "Engine" folder
				bool IsEngineTarget = false;
				bool IsEnterpriseTarget = false;
				bool WantProjectFileForTarget = true;
				if(TargetFilePath.IsUnderDirectory(UnrealBuildTool.EngineDirectory))
				{
					// This is an engine target
					IsEngineTarget = true;

					if(TargetFilePath.IsUnderDirectory(EngineSourceProgramsDirectory))
					{
						WantProjectFileForTarget = IncludeEnginePrograms;
					}
					else if(TargetFilePath.IsUnderDirectory(UnrealBuildTool.EngineSourceDirectory))
					{
						WantProjectFileForTarget = bIncludeEngineSource;
					}
				}
				else if (TargetFilePath.IsUnderDirectory(UnrealBuildTool.EnterpriseSourceDirectory))
				{
					// This is an enterprise target
					IsEnterpriseTarget = true;

					if(TargetFilePath.IsUnderDirectory(EnterpriseSourceProgramsDirectory))
					{
						WantProjectFileForTarget = bIncludeEnterpriseSource && IncludeEnginePrograms;
					}
					else
					{
						WantProjectFileForTarget = bIncludeEnterpriseSource;
					}
				}

				if (WantProjectFileForTarget)
				{
					RulesAssembly RulesAssembly;

					FileReference CheckProjectFile = AllGames.FirstOrDefault(x => TargetFilePath.IsUnderDirectory(x.Directory));
					if(CheckProjectFile == null)
					{
						if(TargetFilePath.IsUnderDirectory(UnrealBuildTool.EnterpriseDirectory))
						{
							RulesAssembly = RulesCompiler.CreateEnterpriseRulesAssembly(false, false);
						}
						else
						{
							RulesAssembly = RulesCompiler.CreateEngineRulesAssembly(false, false);
						}
					}
					else
					{
						RulesAssembly = RulesCompiler.CreateProjectRulesAssembly(CheckProjectFile, false, false);
					}

					// Create target rules for all of the platforms and configuration combinations that we want to enable support for.
					// Just use the current platform as we only need to recover the target type and both should be supported for all targets...
					TargetRules TargetRulesObject = RulesAssembly.CreateTargetRules(TargetName, BuildHostPlatform.Current.Platform, UnrealTargetConfiguration.Development, "", CheckProjectFile, null);

					bool IsProgramTarget = false;

					DirectoryReference GameFolder = null;
					string ProjectFileNameBase = null;
					if (TargetRulesObject.Type == TargetType.Program)
					{
						IsProgramTarget = true;
						ProjectFileNameBase = TargetName;
					}
					else if (IsEngineTarget)
					{
						ProjectFileNameBase = EngineProjectFileNameBase;
					}
					else if (IsEnterpriseTarget)
					{
						ProjectFileNameBase = EnterpriseProjectFileNameBase;
					}
					else
					{
						// Figure out which game project this target belongs to
						FileReference ProjectInfo = FindGameContainingFile(AllGames, TargetFilePath);
						if (ProjectInfo == null)
						{
							throw new BuildException("Found a non-engine target file (" + TargetFilePath + ") that did not exist within any of the known game folders");
						}
						GameFolder = ProjectInfo.Directory;
						ProjectFileNameBase = ProjectInfo.GetFileNameWithoutExtension();
					}

					// Get the suffix to use for this project file. If we have multiple targets of the same type, we'll have to split them out into separate IDE project files.
					string GeneratedProjectName = TargetRulesObject.GeneratedProjectName;
					if(GeneratedProjectName == null)
					{
						ProjectFile ExistingProjectFile;
						if( ProjectFileMap.TryGetValue( GetProjectLocation(ProjectFileNameBase), out ExistingProjectFile ) && ExistingProjectFile.ProjectTargets.Any(x => x.TargetRules.Type == TargetRulesObject.Type))
						{
							GeneratedProjectName = TargetRulesObject.Name;
						}
						else
						{
							GeneratedProjectName = ProjectFileNameBase;
						}
					}

					// @todo projectfiles: We should move all of the Target.cs files out of sub-folders to clean up the project directories a bit (e.g. GameUncooked folder)
					FileReference ProjectFilePath = GetProjectLocation(GeneratedProjectName);
					if (TargetRulesObject.Type == TargetType.Game || TargetRulesObject.Type == TargetType.Client || TargetRulesObject.Type == TargetType.Server)
					{
						// Allow platforms to generate stub projects here...
						PlatformProjectGenerators.GenerateGameProjectStubs(
							InGenerator: this,
							InTargetName: TargetName,
							InTargetFilepath: TargetFilePath.FullName,
							InTargetRules: TargetRulesObject,
							InPlatforms: SupportedPlatforms,
							InConfigurations: SupportedConfigurations);
					}

					DirectoryReference BaseFolder;
					if (IsProgramTarget)
					{
						BaseFolder = TargetFilePath.Directory;
					}
					else if (IsEngineTarget)
					{
						BaseFolder = UnrealBuildTool.EngineDirectory;
					}
					else if (IsEnterpriseTarget)
					{
						BaseFolder = UnrealBuildTool.EnterpriseDirectory;
					}
					else
					{
						BaseFolder = GameFolder;
					}

					bool bProjectAlreadyExisted;
					ProjectFile ProjectFile = FindOrAddProject(ProjectFilePath, BaseFolder, IncludeInGeneratedProjects: true, bAlreadyExisted: out bProjectAlreadyExisted);
					ProjectFile.IsForeignProject = CheckProjectFile != null && !NativeProjects.IsNativeProject(CheckProjectFile);
					ProjectFile.IsGeneratedProject = true;
					ProjectFile.IsStubProject = UnrealBuildTool.IsProjectInstalled();
					if (TargetRulesObject.bBuildInSolutionByDefault.HasValue)
					{
						ProjectFile.ShouldBuildByDefaultForSolutionTargets = TargetRulesObject.bBuildInSolutionByDefault.Value;
					}

					// Add the project to the right output list
					if (IsProgramTarget)
					{
						ProgramProjects[TargetFilePath] = ProjectFile;
					}
					else if (IsEngineTarget)
					{
						EngineProject = ProjectFile;
						if (UnrealBuildTool.IsEngineInstalled())
						{
							// Allow engine projects to be created but not built for Installed Engine builds
							EngineProject.IsForeignProject = false;
							EngineProject.IsGeneratedProject = true;
							EngineProject.IsStubProject = true;
						}
					}
					else if (IsEnterpriseTarget)
					{
						EnterpriseProject = ProjectFile;
						if (UnrealBuildTool.IsEnterpriseInstalled())
						{
							// Allow enterprise projects to be created but not built for Installed Engine builds
							EnterpriseProject.IsForeignProject = false;
							EnterpriseProject.IsGeneratedProject = true;
							EnterpriseProject.IsStubProject = true;
						}
					}
					else
					{
						if (!bProjectAlreadyExisted)
						{
							GameProjects.Add(ProjectFile);

							// Add the .uproject file for this game/template
							FileReference UProjectFilePath = FileReference.Combine(BaseFolder, ProjectFileNameBase + ".uproject");
							if (FileReference.Exists(UProjectFilePath))
							{
								ProjectFile.AddFileToProject(UProjectFilePath, BaseFolder);
							}
							else
							{
								throw new BuildException("Not expecting to find a game with no .uproject file.  File '{0}' doesn't exist", UProjectFilePath);
							}
						}
					}

					foreach (ProjectTarget ExistingProjectTarget in ProjectFile.ProjectTargets)
					{
						if (ExistingProjectTarget.TargetRules.Type == TargetRulesObject.Type)
						{
							throw new BuildException("Not expecting project {0} to already have a target rules of with configuration name {1} ({2}) while trying to add: {3}", ProjectFilePath, TargetRulesObject.Type.ToString(), ExistingProjectTarget.TargetRules.ToString(), TargetRulesObject.ToString());
						}

						// Not expecting to have both a game and a program in the same project.  These would alias because we share the project and solution configuration names (just because it makes sense to)
						if ((ExistingProjectTarget.TargetRules.Type == TargetType.Game && TargetRulesObject.Type == TargetType.Program) ||
							(ExistingProjectTarget.TargetRules.Type == TargetType.Program && TargetRulesObject.Type == TargetType.Game))
						{
							throw new BuildException("Not expecting project {0} to already have a Game/Program target ({1}) associated with it while trying to add: {2}", ProjectFilePath, ExistingProjectTarget.TargetRules.ToString(), TargetRulesObject.ToString());
						}
					}

					ProjectTarget ProjectTarget = new ProjectTarget()
						{
							TargetRules = TargetRulesObject,
							TargetFilePath = TargetFilePath,
							ProjectFilePath = ProjectFilePath,
							UnrealProjectFilePath = CheckProjectFile,
							SupportedPlatforms = TargetRulesObject.GetSupportedPlatforms().Where(x => UEBuildPlatform.GetBuildPlatform(x, true) != null).ToArray(),
							CreateRulesDelegate = (Platform, Configuration) => RulesAssembly.CreateTargetRules(TargetName, Platform, Configuration, "", CheckProjectFile, null)
                        };

					ProjectFile.ProjectTargets.Add(ProjectTarget);

					// Make sure the *.Target.cs file is in the project.
					ProjectFile.AddFileToProject(TargetFilePath, BaseFolder);

					Log.TraceVerbose("Generating target {0} for {1}", TargetRulesObject.Type.ToString(), ProjectFilePath);
				}
			}
		}

		/// <summary>
		/// Adds separate project files for all mods
		/// </summary>
		/// <param name="GameProjects">List of game project files</param>
		/// <param name="ModProjects">Receives the list of mod projects on success</param>
		void AddProjectsForMods(List<ProjectFile> GameProjects, out List<ProjectFile> ModProjects)
		{
			// Find all the mods for game projects
			ModProjects = new List<ProjectFile>();
			if(GameProjects.Count == 1)
			{
				ProjectFile GameProject = GameProjects.First();
				foreach(PluginInfo PluginInfo in Plugins.ReadProjectPlugins(GameProject.BaseDir))
				{
					if(PluginInfo.Descriptor.Modules != null && PluginInfo.Descriptor.Modules.Length > 0 && PluginInfo.Type == PluginType.Mod)
					{
						FileReference ModProjectFilePath = FileReference.Combine(PluginInfo.Directory, "Mods", PluginInfo.Name + ProjectFileExtension);

						bool bProjectAlreadyExisted;
						ProjectFile ModProjectFile = FindOrAddProject(ModProjectFilePath, PluginInfo.Directory, IncludeInGeneratedProjects: true, bAlreadyExisted: out bProjectAlreadyExisted);
						ModProjectFile.IsForeignProject = GameProject.IsForeignProject;
						ModProjectFile.IsGeneratedProject = true;
						ModProjectFile.IsStubProject = false;
						ModProjectFile.PluginFilePath = PluginInfo.File;
						ModProjectFile.ProjectTargets.AddRange(GameProject.ProjectTargets);

						AddPluginFilesToProject(PluginInfo.File, PluginInfo.Directory, ModProjectFile);

						ModProjects.Add(ModProjectFile);
					}
				}
			}
		}

		/// <summary>
		/// Gets the location for a project file
		/// </summary>
		/// <param name="BaseName">The base name for the project file</param>
		/// <returns>Full path to the project file</returns>
		private FileReference GetProjectLocation(string BaseName)
		{
			return FileReference.Combine(IntermediateProjectFilesPath, BaseName + ProjectFileExtension);
		}
		
		/// Adds shader source code to the specified project
		protected void AddEngineShaderSource( ProjectFile EngineProject )
		{
			// Setup a project file entry for this module's project.  Remember, some projects may host multiple modules!
			DirectoryReference ShadersDirectory = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Shaders" );
			if(DirectoryReference.Exists(ShadersDirectory))
			{
				List<string> SubdirectoryNamesToExclude = new List<string>();
				{
					// Don't include binary shaders in the project file.
					SubdirectoryNamesToExclude.Add( "Binaries" );
					// We never want shader intermediate files in our project file
					SubdirectoryNamesToExclude.Add( "PDBDump" );
					SubdirectoryNamesToExclude.Add( "WorkingDirectory" );
				}

				EngineProject.AddFilesToProject( SourceFileSearch.FindFiles( ShadersDirectory, SubdirectoryNamesToExclude ), UnrealBuildTool.EngineDirectory );
			}
		}


		/// Adds engine build infrastructure files to the specified project
		protected void AddEngineBuildFiles( ProjectFile EngineProject )
		{
			DirectoryReference BuildDirectory = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Build" );

			List<string> SubdirectoryNamesToExclude = new List<string>();
			SubdirectoryNamesToExclude.Add("Receipts");

			EngineProject.AddFilesToProject( SourceFileSearch.FindFiles( BuildDirectory, SubdirectoryNamesToExclude ), UnrealBuildTool.EngineDirectory );
		}



		/// Adds engine documentation to the specified project
		protected void AddEngineDocumentation( ProjectFile EngineProject )
		{
			// NOTE: The project folder added here will actually be collapsed away later if not needed
			DirectoryReference DocumentationProjectDirectory = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Documentation" );
			DirectoryReference DocumentationSourceDirectory = DirectoryReference.Combine( UnrealBuildTool.EngineDirectory, "Documentation", "Source" );
			DirectoryInfo DirInfo = new DirectoryInfo( DocumentationProjectDirectory.FullName );
			if( DirInfo.Exists && DirectoryReference.Exists(DocumentationSourceDirectory) )
			{
				Log.TraceVerbose( "Adding documentation files..." );

				List<string> SubdirectoryNamesToExclude = new List<string>();
				{
					// We never want any of the images or attachment files included in our generated project
					SubdirectoryNamesToExclude.Add( "Images" );
					SubdirectoryNamesToExclude.Add( "Attachments" );

					// The API directory is huge, so don't include any of it
					SubdirectoryNamesToExclude.Add("API");

					// Omit Javascript source because it just confuses the Visual Studio IDE
					SubdirectoryNamesToExclude.Add( "Javascript" );
				}

				List<FileReference> DocumentationFiles = SourceFileSearch.FindFiles( DocumentationSourceDirectory, SubdirectoryNamesToExclude );

				// Filter out non-English documentation files if we were configured to do so
				if( !bAllDocumentationLanguages )
				{
					List<FileReference> FilteredDocumentationFiles = new List<FileReference>();
					foreach( FileReference DocumentationFile in DocumentationFiles )
					{
						bool bPassesFilter = true;
						if( DocumentationFile.FullName.EndsWith( ".udn", StringComparison.InvariantCultureIgnoreCase ) )
						{
							string LanguageSuffix = Path.GetExtension( Path.GetFileNameWithoutExtension( DocumentationFile.FullName ) );
							if( !String.IsNullOrEmpty( LanguageSuffix ) &&
								!LanguageSuffix.Equals( ".int", StringComparison.InvariantCultureIgnoreCase ) )
							{
								bPassesFilter = false;
							}
						}

						if( bPassesFilter )
						{
							FilteredDocumentationFiles.Add( DocumentationFile );
						}
					}
					DocumentationFiles = FilteredDocumentationFiles;
				}

				EngineProject.AddFilesToProject( DocumentationFiles, UnrealBuildTool.EngineDirectory );
			}
			else
			{
				Log.TraceVerbose("Skipping documentation project... directory not found");
			}
		}




		/// <summary>
		/// Adds a new project file and returns an object that represents that project file (or if the project file is already known, returns that instead.)
		/// </summary>
		/// <param name="FilePath">Full path to the project file</param>
		/// <param name="BaseDir">Base directory for files in this project</param>
		/// <param name="IncludeInGeneratedProjects">True if this project should be included in the set of generated projects.  Only matters when actually generating project files.</param>
		/// <param name="bAlreadyExisted">True if we already had this project file</param>
		/// <returns>Object that represents this project file in Unreal Build Tool</returns>
		public ProjectFile FindOrAddProject( FileReference FilePath, DirectoryReference BaseDir, bool IncludeInGeneratedProjects, out bool bAlreadyExisted )
		{
			if( FilePath == null )
			{
				throw new BuildException( "Not valid to call FindOrAddProject() with an empty file path!" );
			}

			// Do we already have this project?
			ProjectFile ExistingProjectFile;
			if( ProjectFileMap.TryGetValue( FilePath, out ExistingProjectFile ) )
			{
				bAlreadyExisted = true;
				return ExistingProjectFile;
			}

			// Add a new project file for the specified path
			ProjectFile NewProjectFile = AllocateProjectFile( FilePath );
			NewProjectFile.BaseDir = BaseDir;
			ProjectFileMap[ FilePath ] = NewProjectFile;

			if( IncludeInGeneratedProjects )
			{
				GeneratedProjectFiles.Add( NewProjectFile );
			}

			bAlreadyExisted = false;
			return NewProjectFile;
		}


		/// <summary>
		/// Allocates a generator-specific project file object
		/// </summary>
		/// <param name="InitFilePath">Path to the project file</param>
		/// <returns>The newly allocated project file object</returns>
		protected abstract ProjectFile AllocateProjectFile( FileReference InitFilePath );


		/// <summary>
		/// Allocates a generator-specific master project folder object
		/// </summary>
		/// <param name="OwnerProjectFileGenerator">Project file generator that owns this object</param>
		/// <param name="FolderName">Name for this folder</param>
		/// <returns>The newly allocated project folder object</returns>
		public abstract MasterProjectFolder AllocateMasterProjectFolder(ProjectFileGenerator OwnerProjectFileGenerator, string FolderName );



		/// <summary>
		/// Returns a list of all the known project files
		/// </summary>
		/// <returns>Project file list</returns>
		public List<ProjectFile> AllProjectFiles
		{
			get
			{
				List<ProjectFile> CombinedList = new List<ProjectFile>();
				CombinedList.AddRange( GeneratedProjectFiles );
				CombinedList.AddRange( OtherProjectFiles );
				return CombinedList;
			}
		}

	
		/// <summary>
		/// Writes the project files to disk
		/// </summary>
		/// <returns>True if successful</returns>
		protected virtual bool WriteProjectFiles(PlatformProjectGeneratorCollection PlatformProjectGenerators)
		{
            using(ProgressWriter Progress = new ProgressWriter("Writing project files...", true))
			{
				int TotalProjectFileCount = GeneratedProjectFiles.Count + 1;	// +1 for the master project file, which we'll save next

				for(int ProjectFileIndex = 0 ; ProjectFileIndex < GeneratedProjectFiles.Count; ++ProjectFileIndex )
				{
					ProjectFile CurProject = GeneratedProjectFiles[ ProjectFileIndex ];
					if( !CurProject.WriteProjectFile(SupportedPlatforms, SupportedConfigurations, PlatformProjectGenerators) )
					{
						return false;
					}

					Progress.Write(ProjectFileIndex + 1, TotalProjectFileCount);
				}

				WriteMasterProjectFile( UBTProject, PlatformProjectGenerators );
				Progress.Write(TotalProjectFileCount, TotalProjectFileCount);
			}
			return true;
		}

		/// <summary>
		/// Writes the master project file (e.g. Visual Studio Solution file)
		/// </summary>
		/// <param name="UBTProject">The UnrealBuildTool project</param>
		/// <param name="PlatformProjectGenerators">The platform project file generators</param>
		/// <returns>True if successful</returns>
		protected abstract bool WriteMasterProjectFile( ProjectFile UBTProject, PlatformProjectGeneratorCollection PlatformProjectGenerators );


		/// <summary>
		/// Writes any additional solution-wide debug files (e.g. UnrealVS hints)
		/// </summary>
		/// <param name="PlatformProjectGenerators">The platform project generators</param>
		/// <param name="IntermediateProjectFilesPath">Intermediate project files folder</param>
		protected virtual void WriteDebugSolutionFiles( PlatformProjectGeneratorCollection PlatformProjectGenerators, DirectoryReference IntermediateProjectFilesPath )
		{
		}


		/// <summary>
		/// Writes the specified string content to a file.  Before writing to the file, it loads the existing file (if present) to see if the contents have changed
		/// </summary>
		/// <param name="FileName">File to write</param>
		/// <param name="NewFileContents">File content</param>
		/// <param name="InEncoding"></param>
		/// <returns>True if the file was saved, or if it didn't need to be overwritten because the content was unchanged</returns>
		public static bool WriteFileIfChanged( string FileName, string NewFileContents, Encoding InEncoding = null )
		{
			// Check to see if the file already exists, and if so, load it up
			string LoadedFileContent = null;
			bool FileAlreadyExists = File.Exists( FileName );
			if( FileAlreadyExists )
			{
				try
				{
					LoadedFileContent = File.ReadAllText( FileName );
				}
				catch( Exception )
				{
					Log.TraceInformation( "Error while trying to load existing file {0}.  Ignored.", FileName );
				}
			}


			// Don't bother saving anything out if the new file content is the same as the old file's content
			bool FileNeedsSave = true;
			if( LoadedFileContent != null )
			{
				bool bIgnoreProjectFileWhitespaces = true;
				if (ProjectFileComparer.CompareOrdinalIgnoreCase(LoadedFileContent, NewFileContents, bIgnoreProjectFileWhitespaces) == 0)
				{
					// Exact match!
					FileNeedsSave = false;
				}

				if( !FileNeedsSave )
				{
					Log.TraceVerbose( "Skipped saving {0} because contents haven't changed.", Path.GetFileName( FileName ) );
				}
			}

			if( FileNeedsSave )
			{
				// Save the file
				try
				{
					Directory.CreateDirectory( Path.GetDirectoryName( FileName ) );
                    // When WriteAllText is passed Encoding.UTF8 it likes to write a BOM marker
                    // at the start of the file (adding two bytes to the file length).  For most
                    // files this is only mildly annoying but for Makefiles it can actually make
                    // them un-useable.
                    // TODO(sbc): See if we can just drop the Encoding.UTF8 argument on all
                    // platforms.  In this case UTF8 encoding will still be used but without the
                    // BOM, which is, AFAICT, desirable in almost all cases.
					if (BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Linux || BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Mac)
                        File.WriteAllText(FileName, NewFileContents, new UTF8Encoding());
                    else
                        File.WriteAllText(FileName, NewFileContents, InEncoding != null ? InEncoding : Encoding.UTF8);
                    Log.TraceVerbose("Saved {0}", Path.GetFileName(FileName));
				}
				catch( Exception ex )
				{
					// Unable to write to the project file.
					string Message = string.Format("Error while trying to write file {0}.  The file is probably read-only.", FileName);
					Log.TraceInformation("");
					Log.TraceError(Message);
					throw new BuildException(ex, Message);
				}
			}

			return true;
		}

		/// <summary>
		/// Adds the given project to the OtherProjects list
		/// </summary>
		/// <param name="InProject">The project to add</param>
		/// <param name="bNeedsAllPlatformAndConfigurations"></param>
		/// <param name="bForceDevelopmentConfiguration"></param>
		/// <param name="bProjectDeploys"></param>
		/// <param name="InSupportedPlatforms"></param>
		/// <param name="InSupportedConfigurations"></param>
		/// <returns>True if successful</returns>
		public void AddExistingProjectFile(ProjectFile InProject, bool bNeedsAllPlatformAndConfigurations = false, bool bForceDevelopmentConfiguration = false, bool bProjectDeploys = false, List<UnrealTargetPlatform> InSupportedPlatforms = null, List<UnrealTargetConfiguration> InSupportedConfigurations = null)
		{
			if( InProject.ProjectTargets.Count != 0 )
			{
				throw new BuildException( "Expecting existing project to not have any ProjectTargets defined yet." );
			}
			
			ProjectTarget ProjectTarget = new ProjectTarget();
			ProjectTarget.SupportedPlatforms = new UnrealTargetPlatform[0];
			if( bForceDevelopmentConfiguration )
			{
				ProjectTarget.ForceDevelopmentConfiguration = true;
			}
			ProjectTarget.ProjectDeploys = bProjectDeploys;

			if (bNeedsAllPlatformAndConfigurations)
			{
				// Add all platforms
				Array AllPlatforms = Enum.GetValues(typeof(UnrealTargetPlatform));
				foreach (UnrealTargetPlatform CurPlatfrom in AllPlatforms)
				{
					ProjectTarget.ExtraSupportedPlatforms.Add(CurPlatfrom);
				}

				// Add all configurations
				Array AllConfigurations = Enum.GetValues(typeof(UnrealTargetConfiguration));
				foreach (UnrealTargetConfiguration CurConfiguration in AllConfigurations)
				{
					ProjectTarget.ExtraSupportedConfigurations.Add( CurConfiguration );
				}
			}
			else if (InSupportedPlatforms != null || InSupportedConfigurations != null)
			{
				if (InSupportedPlatforms != null)
				{
					// Add all explicitly specified platforms
					foreach (UnrealTargetPlatform CurPlatfrom in InSupportedPlatforms)
					{
						ProjectTarget.ExtraSupportedPlatforms.Add(CurPlatfrom);
					}
				}
				else
				{
					// Otherwise, add all platforms
					Array AllPlatforms = Enum.GetValues(typeof(UnrealTargetPlatform));
					foreach (UnrealTargetPlatform CurPlatfrom in AllPlatforms)
					{
						ProjectTarget.ExtraSupportedPlatforms.Add(CurPlatfrom);
					}
				}

				if (InSupportedConfigurations != null)
				{
					// Add all explicitly specified configurations
					foreach (UnrealTargetConfiguration CurConfiguration in InSupportedConfigurations)
					{
						ProjectTarget.ExtraSupportedConfigurations.Add(CurConfiguration);
					}
				}
				else
				{
					// Otherwise, add all configurations
					Array AllConfigurations = Enum.GetValues(typeof(UnrealTargetConfiguration));
					foreach (UnrealTargetConfiguration CurConfiguration in AllConfigurations)
					{
						ProjectTarget.ExtraSupportedConfigurations.Add(CurConfiguration);
					}
				}
			}
			else
			{
                bool bFoundDevelopmentConfig = false;
                bool bFoundDebugConfig = false;

                try
                {

                    // Parse the project and ensure both Development and Debug configurations are present
                    foreach (string Config in XElement.Load(InProject.ProjectFilePath.FullName).Elements("{http://schemas.microsoft.com/developer/msbuild/2003}PropertyGroup")
                                           .Where(node => node.Attribute("Condition") != null)
                                           .Select(node => node.Attribute("Condition").ToString())
                                           .ToList())
                    {
                        if (Config.Contains("Development|"))
                        {
                            bFoundDevelopmentConfig = true;
                        }
                        else if (Config.Contains("Debug|"))
                        {
                            bFoundDebugConfig = true;
                        }
                    }
                }
                catch
                {
                    Trace.TraceError("Unable to parse existing project file {0}", InProject.ProjectFilePath.FullName);
                }

                if (!bFoundDebugConfig || !bFoundDevelopmentConfig)
                {
                    throw new BuildException("Existing C# project {0} must contain a {1} configuration", InProject.ProjectFilePath.FullName, bFoundDebugConfig ? "Development" : "Debug");
                }

                // For existing project files, just support the default desktop platforms and configurations
                ProjectTarget.ExtraSupportedPlatforms.AddRange(Utils.GetPlatformsInClass(UnrealPlatformClass.Desktop));
				// Debug and Development only
				ProjectTarget.ExtraSupportedConfigurations.Add(UnrealTargetConfiguration.Debug);
				ProjectTarget.ExtraSupportedConfigurations.Add(UnrealTargetConfiguration.Development);
			}

			InProject.ProjectTargets.Add( ProjectTarget );

			// Existing projects must always have a GUID.  This will throw an exception if one isn't found.
			InProject.LoadGUIDFromExistingProject();

			OtherProjectFiles.Add( InProject );
		}

		/// The default project to be built for the solution.
		protected ProjectFile DefaultProject;

		/// The project for UnrealBuildTool.  Note that when generating project files for installed builds, we won't have
		/// an UnrealBuildTool project at all.
		protected ProjectFile UBTProject;

		/// List of platforms that we'll support in the project files
		protected List<UnrealTargetPlatform> SupportedPlatforms = new List<UnrealTargetPlatform>();

		/// List of build configurations that we'll support in the project files
		protected List<UnrealTargetConfiguration> SupportedConfigurations = new List<UnrealTargetConfiguration>();

		/// Map of project file names to their project files.  This includes every single project file in memory or otherwise that
		/// we know about so far.  Note that when generating project files, this map may even include project files that we won't
		/// be including in the generated projects.
		protected readonly Dictionary<FileReference, ProjectFile> ProjectFileMap = new Dictionary<FileReference, ProjectFile>();

		/// List of project files that we'll be generating
		protected readonly List<ProjectFile> GeneratedProjectFiles = new List<ProjectFile>();

		/// List of other project files that we want to include in a generated solution file, even though we
		/// aren't generating them ourselves.  Note that these may *not* always be C++ project files (e.g. C#)
		protected readonly List<ProjectFile> OtherProjectFiles = new List<ProjectFile>();

        protected readonly List<ProjectFile> AutomationProjectFiles = new List<ProjectFile>();

		/// List of top-level folders in the master project file
		protected MasterProjectFolder RootFolder;
	}

	/// <summary>
	/// Helper class used for comparing the existing and generated project files.
	/// </summary>
	class ProjectFileComparer
	{
		//static readonly string GUIDRegexPattern = "(\\{){0,1}[0-9a-fA-F]{8}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{12}(\\}){0,1}";
		//static readonly string GUIDReplaceString = "GUID";

		/// <summary>
		/// Used by CompareOrdinalIgnoreWhitespaceAndCase to determine if a whitespace can be ignored.
		/// </summary>
		/// <param name="Whitespace">Whitespace character.</param>
		/// <returns>true if the character can be ignored, false otherwise.</returns>
		static bool CanIgnoreWhitespace(char Whitespace)
		{
			// Only ignore spaces and tabs.
			return Whitespace == ' ' || Whitespace == '\t';
		}

		/*
		/// <summary>
		/// Replaces all GUIDs in the project file with "GUID" text.
		/// </summary>
		/// <param name="ProjectFileContents">Contents of the project file to remove GUIDs from.</param>
		/// <returns>String with all GUIDs replaced with "GUID" text.</returns>
		static string StripGUIDs(string ProjectFileContents)
		{
			// Replace all GUIDs with "GUID" text.
			return System.Text.RegularExpressions.Regex.Replace(ProjectFileContents, GUIDRegexPattern, GUIDReplaceString);
		}
		*/

		/// <summary>
		/// Compares two project files ignoring whitespaces, case and GUIDs.
		/// </summary>
		/// <remarks>
		/// Compares two specified String objects by evaluating the numeric values of the corresponding Char objects in each string.
		/// Only space and tabulation characters are ignored. Ignores leading whitespaces at the beginning of each line and 
		/// differences in whitespace sequences between matching non-whitespace sub-strings.
		/// </remarks>
		/// <param name="StrA">The first string to compare.</param>
		/// <param name="StrB">The second string to compare. </param>
		/// <returns>An integer that indicates the lexical relationship between the two comparands.</returns>
		public static int CompareOrdinalIgnoreWhitespaceAndCase(string StrA, string StrB)
		{
			// Remove GUIDs before processing the strings.
			//StrA = StripGUIDs(StrA);
			//StrB = StripGUIDs(StrB);

			int IndexA = 0;
			int IndexB = 0;
			while (IndexA < StrA.Length && IndexB < StrB.Length)
			{
				char A = Char.ToLowerInvariant(StrA[IndexA]);
				char B = Char.ToLowerInvariant(StrB[IndexB]);
				if (Char.IsWhiteSpace(A) && Char.IsWhiteSpace(B) && CanIgnoreWhitespace(A) && CanIgnoreWhitespace(B))
				{
					// Skip whitespaces in both strings
					for (IndexA++; IndexA < StrA.Length && Char.IsWhiteSpace(StrA[IndexA]) == true; IndexA++) ;
					for (IndexB++; IndexB < StrB.Length && Char.IsWhiteSpace(StrB[IndexB]) == true; IndexB++) ;
				}
				else if (Char.IsWhiteSpace(A) && IndexA > 0 && StrA[IndexA - 1] == '\n')
				{
					// Skip whitespaces in StrA at the beginning of each line
					for (IndexA++; IndexA < StrA.Length && Char.IsWhiteSpace(StrA[IndexA]) == true; IndexA++) ;
				}
				else if (Char.IsWhiteSpace(B) && IndexB > 0 && StrB[IndexB - 1] == '\n')
				{
					// Skip whitespaces in StrA at the beginning of each line
					for (IndexB++; IndexB < StrB.Length && Char.IsWhiteSpace(StrB[IndexB]) == true; IndexB++) ;
				}
				else if (A != B)
				{
					return A - B;
				}
				else
				{
					IndexA++;
					IndexB++;
				}
			}
			// Check if we reached the end in both strings
			return (StrA.Length - IndexA) - (StrB.Length - IndexB);
		}

		/// <summary>
		/// Compares two project files ignoring case and GUIDs.
		/// </summary>
		/// <param name="StrA">The first string to compare.</param>
		/// <param name="StrB">The second string to compare. </param>
		/// <returns>An integer that indicates the lexical relationship between the two comparands.</returns>
		public static int CompareOrdinalIgnoreCase(string StrA, string StrB)
		{
			// Remove GUIDs before processing the strings.
			//StrA = StripGUIDs(StrA);
			//StrB = StripGUIDs(StrB);

			// Use simple ordinal comparison.
			return String.Compare(StrA, StrB, StringComparison.InvariantCultureIgnoreCase);
		}

		/// <summary>
		/// Compares two project files ignoring case and GUIDs.
		/// </summary>
		/// <see cref="CompareOrdinalIgnoreWhitespaceAndCase"/>
		/// <param name="StrA">The first string to compare.</param>
		/// <param name="StrB">The second string to compare. </param>
		/// <param name="bIgnoreWhitespace">True if whitsapces should be ignored.</param>
		/// <returns>An integer that indicates the lexical relationship between the two comparands.</returns>
		public static int CompareOrdinalIgnoreCase(string StrA, string StrB, bool bIgnoreWhitespace)
		{
			if (bIgnoreWhitespace)
			{
				return CompareOrdinalIgnoreWhitespaceAndCase(StrA, StrB);
			}
			else
			{
				return CompareOrdinalIgnoreCase(StrA, StrB);
			}
		}
	}
}