// Copyright Epic Games, Inc. All Rights Reserved.
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Xml;
using System.Diagnostics;
using UnrealBuildTool;
using EpicGames.Core;
using System.Linq;
using System.Reflection;
using OpenTracing;
using OpenTracing.Util;
using UnrealBuildBase;

namespace AutomationTool
{
	class UnrealBuildException : AutomationException
	{
		public UnrealBuildException(string Message)
			: base("BUILD FAILED: " + Message)
		{
			OutputFormat = AutomationExceptionOutputFormat.Minimal;
		}

		public UnrealBuildException(string Format, params object[] Args)
			: this(String.Format(Format, Args))
		{
		}
	}

	[Help("ForceMonolithic", "Toggle to combined the result into one executable")]
	[Help("ForceDebugInfo", "Forces debug info even in development builds")]
	[Help("NoXGE", "Toggle to disable the distributed build process")]
	[Help("ForceNonUnity", "Toggle to disable the unity build system")]
	[Help("ForceUnity", "Toggle to force enable the unity build system")]
	[Help("Licensee", "If set, this build is being compiled by a licensee")]
	public class UnrealBuild
	{
		private BuildCommand OwnerCommand;

		/// <summary>
		/// If true we will let UBT build UHT
		/// </summary>
		public bool AlwaysBuildUHT { get; set; }

		public void AddBuildProduct(string InFile)
		{
			string File = CommandUtils.CombinePaths(InFile);
			if (!CommandUtils.FileExists(File) && !CommandUtils.DirectoryExists(File))
			{
				throw new UnrealBuildException("Specified file to AddBuildProduct {0} does not exist.", File);
			}
			BuildProductFiles.Add(File);
		}

		static bool IsBuildReceipt(string FileName)
		{
			return FileName.EndsWith(".version", StringComparison.InvariantCultureIgnoreCase)
				|| FileName.EndsWith(".target", StringComparison.InvariantCultureIgnoreCase) 
				|| FileName.EndsWith(".modules", StringComparison.InvariantCultureIgnoreCase)
				|| FileName.EndsWith("buildid.txt", StringComparison.InvariantCultureIgnoreCase);
		}

		BuildManifest AddBuildProductsFromManifest(FileReference ManifestFile)
		{
			if (!FileReference.Exists(ManifestFile))
			{
				throw new UnrealBuildException("UBT Manifest {0} does not exist.", ManifestFile);
			}

			BuildManifest Manifest = CommandUtils.ReadManifest(ManifestFile);
			foreach (string Item in Manifest.BuildProducts)
			{
				if (!CommandUtils.FileExists_NoExceptions(Item) && !CommandUtils.DirectoryExists_NoExceptions(Item))
				{
					throw new UnrealBuildException($"AddBuildProductsFromManifest: {Item} was in manifest \"{ManifestFile}\" but could not be found.");
				}
				AddBuildProduct(Item);
			}
			return Manifest;
		}
		
		private void PrepareUBT()
		{
			if (!FileReference.Exists(UnrealBuildToolDll))
			{
				throw new UnrealBuildException($"UnrealBuildTool.dll does not exist at {UnrealBuildToolDll}");
			}

			if (!FileReference.Exists(Unreal.DotnetPath))
			{
				throw new UnrealBuildException($"dotnet executable does not exist at {Unreal.DotnetPath}");
			}
		}

		public class XGEItem
		{
			public FileReference ManifestFile;
			public BuildManifest Manifest;
			public UnrealTargetPlatform Platform;
			public UnrealTargetConfiguration Config;
			public string TargetName;
			public FileReference UProjectPath;
			public List<string> XgeXmlFiles;
			public string OutputCaption;
		}

		XGEItem XGEPrepareBuildWithUBT(string TargetName, UnrealTargetPlatform Platform, UnrealTargetConfiguration Config, FileReference UprojectPath, string InAddArgs)
		{
			string AddArgs = "";
			if (UprojectPath != null)
			{
				AddArgs += " " + CommandUtils.MakePathSafeToUseWithCommandLine(UprojectPath.FullName);
			}
			AddArgs += " -NoUBTMakefiles";
			AddArgs += " " + InAddArgs;

			PrepareUBT();

            FileReference ManifestFile = GetManifestFile(UprojectPath);
			CommandUtils.DeleteFile(ManifestFile);

			ClearExportedXGEXML();

			string UHTArg = this.AlwaysBuildUHT ? "" : "-nobuilduht";

			CommandUtils.RunUBT(CommandUtils.CmdEnv, UnrealBuildToolDll: UnrealBuildToolDll, Project: UprojectPath, Target: TargetName, Platform: Platform, Config: Config, AdditionalArgs: String.Format("-Manifest={0} {1} -NoHotReload -xgeexport {2}", CommandUtils.MakePathSafeToUseWithCommandLine(ManifestFile.FullName), UHTArg, AddArgs));

			XGEItem Result = new XGEItem();
			Result.Platform = Platform;
			Result.Config = Config;
			Result.TargetName = TargetName;
			Result.UProjectPath = UprojectPath;
			Result.ManifestFile = ManifestFile;
			Result.Manifest = CommandUtils.ReadManifest(ManifestFile);
			Result.OutputCaption = String.Format("{0}-{1}-{2}", TargetName, Platform.ToString(), Config.ToString());
			CommandUtils.DeleteFile(ManifestFile);

			Result.XgeXmlFiles = new List<string>();
			foreach (var XGEFile in FindXGEFiles())
			{
				if (!CommandUtils.FileExists_NoExceptions(XGEFile))
				{
					throw new UnrealBuildException("Couldn't find file: {0}", XGEFile);
				}
				int FileNum = 0;
				string OutFile;
				while (true)
				{
					OutFile = CommandUtils.CombinePaths(CommandUtils.CmdEnv.LogFolder, String.Format("UBTExport.{0}.xge.xml", FileNum));
					FileInfo ItemInfo = new FileInfo(OutFile);
					if (!ItemInfo.Exists)
					{
						break;
					}
					FileNum++;
				}
				CommandUtils.CopyFile(XGEFile, OutFile);
				Result.XgeXmlFiles.Add(OutFile);
			}
			ClearExportedXGEXML();
			return Result;
		}

		void XGEFinishBuildWithUBT(XGEItem Item)
		{
			// run the deployment steps, if necessary
			foreach(string DeployTargetFile in Item.Manifest.DeployTargetFiles)
			{
				CommandUtils.RunUBT(CommandUtils.CmdEnv, UnrealBuildToolDll, String.Format("-Mode=Deploy -Receipt=\"{0}\"", DeployTargetFile));
			}

			foreach (string ManifestItem in Item.Manifest.BuildProducts)
			{
				if (!CommandUtils.FileExists_NoExceptions(ManifestItem))
				{
					throw new UnrealBuildException($"XGEFinishBuildWithUBT: \"{ManifestItem}\" was in manifest \"{Item.ManifestFile}\" but could not be found");
				}
				AddBuildProduct(ManifestItem);
			}
		}

		void CleanWithUBT(string TargetName, UnrealTargetPlatform Platform, UnrealTargetConfiguration Config, FileReference UprojectPath, string InAddArgs = "")
		{
			string AddArgs = "";
			if (UprojectPath != null)
			{
				AddArgs += " " + CommandUtils.MakePathSafeToUseWithCommandLine(UprojectPath.FullName);
			}
			AddArgs += " -NoUBTMakefiles";
			AddArgs += " " + InAddArgs;
			if (!TargetName.Equals("UnrealHeaderTool", StringComparison.InvariantCultureIgnoreCase))
			{
				AddArgs += " -nobuilduht";
			}

			PrepareUBT();
			using (IScope Scope = GlobalTracer.Instance.BuildSpan("Compile").StartActive())
			{
				Scope.Span.SetTag("target", TargetName);
				Scope.Span.SetTag("platform", Platform.ToString());
				Scope.Span.SetTag("config", Config.ToString());
				CommandUtils.RunUBT(CommandUtils.CmdEnv, UnrealBuildToolDll: UnrealBuildToolDll, Project: UprojectPath, Target: TargetName, Platform: Platform, Config: Config, AdditionalArgs: "-Clean -NoHotReload" + AddArgs);
			}
        }

		BuildManifest BuildWithUBT(string TargetName, UnrealTargetPlatform TargetPlatform, UnrealTargetConfiguration Config, FileReference UprojectPath, bool ForceFlushMac = false, bool DisableXGE = false, string InAddArgs = "")
		{
			string AddArgs = "";
			if (UprojectPath != null)
			{
				AddArgs += " " + CommandUtils.MakePathSafeToUseWithCommandLine(UprojectPath.FullName);
			}
			AddArgs += " -NoUBTMakefiles";
			AddArgs += " " + InAddArgs;
			if (ForceFlushMac)
			{
				AddArgs += " -flushmac";
			}
			if (DisableXGE)
			{
				AddArgs += " -noxge";
			}

			PrepareUBT();

			FileReference ManifestFile = GetManifestFile(UprojectPath);
			CommandUtils.DeleteFile(ManifestFile);

			CommandUtils.RunUBT(CommandUtils.CmdEnv, UnrealBuildToolDll: UnrealBuildToolDll, Project: UprojectPath, Target: TargetName, Platform: TargetPlatform, Config: Config, AdditionalArgs: String.Format("{0} -Manifest={1} -NoHotReload", AddArgs, CommandUtils.MakePathSafeToUseWithCommandLine(ManifestFile.FullName)));

			BuildManifest Manifest = AddBuildProductsFromManifest(ManifestFile);
			CommandUtils.DeleteFile(ManifestFile);

			return Manifest;
		}

		string[] DotNetProductExtenstions()
		{
			return new string[] 
			{
				".dll",
				".pdb",
				".exe.config",
				".exe",
				"exe.mdb"
			};
		}

		string[] SwarmBuildProducts()
		{
			return new string[]
            {
                "AgentInterface",
                "SwarmAgent",
                "SwarmCoordinator",
                "SwarmCoordinatorInterface",
                "SwarmInterface",
				"SwarmCommonUtils"
            };
		}

		void AddBuildProductsForCSharpProj(string CsProj)
		{
			string BaseOutput = CommandUtils.CmdEnv.LocalRoot + @"/Engine/Binaries/DotNET/" + Path.GetFileNameWithoutExtension(CsProj);
			foreach (var Ext in DotNetProductExtenstions())
			{
				if (CommandUtils.FileExists(BaseOutput + Ext))
				{
					AddBuildProduct(BaseOutput + Ext);
				}
			}
		}

		void AddIOSBuildProductsForCSharpProj(string CsProj)
		{
			string BaseOutput = CommandUtils.CmdEnv.LocalRoot + @"/Engine/Binaries/DotNET/IOS/" + Path.GetFileNameWithoutExtension(CsProj);
			foreach (var Ext in DotNetProductExtenstions())
			{
				if (CommandUtils.FileExists(BaseOutput + Ext))
				{
					AddBuildProduct(BaseOutput + Ext);
				}
			}
		}

		void AddSwarmBuildProducts()
		{
			foreach (var SwarmProduct in SwarmBuildProducts())
			{
				string DotNETOutput = CommandUtils.CmdEnv.LocalRoot + @"/Engine/Binaries/DotNET/" + SwarmProduct;
				string Win64Output = CommandUtils.CmdEnv.LocalRoot + @"/Engine/Binaries/Win64/" + SwarmProduct;
				foreach (var Ext in DotNetProductExtenstions())
				{
					if (CommandUtils.FileExists(DotNETOutput + Ext))
					{
						AddBuildProduct(DotNETOutput + Ext);
					}
				}
				foreach (var Ext in DotNetProductExtenstions())
				{
					if (CommandUtils.FileExists(Win64Output + Ext))
					{
						AddBuildProduct(Win64Output + Ext);
					}
				}
			}
		}

		/// <summary>
		/// Updates the engine version files
		/// </summary>
		public List<FileReference> UpdateVersionFiles(bool ActuallyUpdateVersionFiles = true, int? ChangelistNumberOverride = null, int? CompatibleChangelistNumberOverride = null, string Build = null, bool? IsPromotedOverride = null)
		{
			bool bIsLicenseeVersion = ParseParam("Licensee") || !FileReference.Exists(FileReference.Combine(Unreal.EngineDirectory, "Restricted", "NotForLicensees", "Build", "EpicInternal.txt"));
			bool bIsPromotedBuild = IsPromotedOverride.HasValue? IsPromotedOverride.Value : (ParseParamInt("Promoted", 1) != 0);
			bool bDoUpdateVersionFiles = CommandUtils.P4Enabled && ActuallyUpdateVersionFiles;		
			int ChangelistNumber = 0;
			if (bDoUpdateVersionFiles)
			{
				ChangelistNumber = ChangelistNumberOverride.HasValue? ChangelistNumberOverride.Value : CommandUtils.P4Env.Changelist;
			}
			int CompatibleChangelistNumber = 0;
			if(bDoUpdateVersionFiles && CompatibleChangelistNumberOverride.HasValue)
			{
				CompatibleChangelistNumber = CompatibleChangelistNumberOverride.Value;
			}

			string Branch = OwnerCommand.ParseParamValue("Branch");
			if (String.IsNullOrEmpty(Branch))
			{
				Branch = CommandUtils.P4Enabled ? CommandUtils.EscapePath(CommandUtils.P4Env.Branch) : "";
			}

			return StaticUpdateVersionFiles(ChangelistNumber, CompatibleChangelistNumber, Branch, Build, bIsLicenseeVersion, bIsPromotedBuild, bDoUpdateVersionFiles);
		}

		public static List<FileReference> StaticUpdateVersionFiles(int ChangelistNumber, int CompatibleChangelistNumber, string Branch, string Build, bool bIsLicenseeVersion, bool bIsPromotedBuild, bool bDoUpdateVersionFiles)
		{
			FileReference BuildVersionFile = BuildVersion.GetDefaultFileName();

			// Get the revision to sync files to before 
			if(CommandUtils.P4Enabled && ChangelistNumber > 0)
			{
				CommandUtils.P4.Sync(String.Format("-f \"{0}@{1}\"", BuildVersionFile, ChangelistNumber), false, false);
			}

			BuildVersion Version;
			if(!BuildVersion.TryRead(BuildVersionFile, out Version))
			{
				Version = new BuildVersion();
			}

			List<FileReference> Result = new List<FileReference>(1);
			{
				if (bDoUpdateVersionFiles)
				{
					CommandUtils.LogLog("Updating {0} with:", BuildVersionFile);
					CommandUtils.LogLog("  Changelist={0}", ChangelistNumber);
					CommandUtils.LogLog("  CompatibleChangelist={0}", CompatibleChangelistNumber);
					CommandUtils.LogLog("  IsLicenseeVersion={0}", bIsLicenseeVersion? 1 : 0);
					CommandUtils.LogLog("  IsPromotedBuild={0}", bIsPromotedBuild? 1 : 0);
					CommandUtils.LogLog("  BranchName={0}", Branch);
					CommandUtils.LogLog("  BuildVersion={0}", Build);

					Version.Changelist = ChangelistNumber;
					if(CompatibleChangelistNumber > 0)
					{
						Version.CompatibleChangelist = CompatibleChangelistNumber;
					}
					else if(bIsLicenseeVersion != Version.IsLicenseeVersion)
					{
						Version.CompatibleChangelist = 0; // Clear out the compatible changelist number; it corresponds to a different P4 server.
					}
					Version.IsLicenseeVersion = bIsLicenseeVersion;
					Version.IsPromotedBuild = bIsPromotedBuild;
					Version.BranchName = Branch;
					Version.BuildVersionString = Build;

					if (File.Exists(BuildVersionFile.FullName))
					{
						VersionFileUpdater.MakeFileWriteable(BuildVersionFile.FullName);
					}

					Version.Write(BuildVersionFile);
				}
				else
				{
					CommandUtils.LogVerbose("{0} will not be updated because P4 is not enabled.", BuildVersionFile);
				}
				Result.Add(BuildVersionFile);
			}

			return Result;
		}

		[DebuggerDisplay("{TargetName} {Platform} {Config}")]
		public class BuildTarget
		{
			/// <summary>
			/// Name of the target
			/// </summary>
			public string TargetName;

			/// <summary>
			/// For code-based projects with a .uproject, the TargetName isn't enough for UBT to find the target, this will point UBT to the target
			/// </summary>
			public FileReference UprojectPath;

			/// <summary>
			/// Platform to build
			/// </summary>
			public UnrealTargetPlatform Platform;

			/// <summary>
			/// Configuration to build
			/// </summary>
			public UnrealTargetConfiguration Config;

			/// <summary>
			/// Extra UBT args
			/// </summary>
			public string UBTArgs;

			/// <summary>
			/// Whether to clean this target. If not specified, the target will be cleaned if -Clean is on the command line.
			/// </summary>
			public bool? Clean;

			/// <summary>
			/// Format as string
			/// </summary>
			/// <returns></returns>
			public override string ToString()
			{
				return string.Format("{0} {1} {2}", TargetName, Platform, Config);
			}
		}


		public class BuildAgenda
		{
			/// <summary>
			/// .NET .csproj files that will be compiled and included in the build.  Currently we assume the output
			/// binary file names match the solution file base name, but with various different binary file extensions.
			/// </summary>
			public List<string> DotNetProjects = new List<string>();

			public string SwarmAgentProject = "";
			public string SwarmCoordinatorProject = "";

			/// <summary>
			/// List of targets to build.  These can be various Unreal projects, programs or libraries in various configurations
			/// </summary>
			public List<BuildTarget> Targets = new List<BuildTarget>();

			/// <summary>
			/// Adds a target with the specified configuration.
			/// </summary>
			/// <param name="TargetName">Name of the target</param>
			/// <param name="InPlatform">Platform</param>
			/// <param name="InConfiguration">Configuration</param>
			/// <param name="InUprojectPath">Path to optional uproject file</param>
			/// <param name="InAddArgs">Specifies additional arguments for UBT</param>
			public void AddTarget(string TargetName, UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration, FileReference InUprojectPath = null, string InAddArgs = "")
			{
				// Is this platform a compilable target?
				if (!Platform.GetPlatform(InPlatform).CanBeCompiled())
				{
					return;
				}

				Targets.Add(new BuildTarget()
				{
					TargetName = TargetName,
					Platform = InPlatform,
					Config = InConfiguration,
					UprojectPath = InUprojectPath,
					UBTArgs = InAddArgs,
				});
			}

			/// <summary>
			/// Adds multiple targets with the specified configuration.
			/// </summary>
			/// <param name="TargetNames">List of targets.</param>
			/// <param name="InPlatform">Platform</param>
			/// <param name="InConfiguration">Configuration</param>
			/// <param name="InUprojectPath">Path to optional uproject file</param>
			/// <param name="InAddArgs">Specifies additional arguments for UBT</param>
			public void AddTargets(string[] TargetNames, UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration, FileReference InUprojectPath = null, string InAddArgs = "")
			{
				// Is this platform a compilable target?
				if (!Platform.GetPlatform(InPlatform).CanBeCompiled())
				{
					return;
				}

				foreach (var Target in TargetNames)
				{
					Targets.Add(new BuildTarget()
					{
						TargetName = Target,
						Platform = InPlatform,
						Config = InConfiguration,
						UprojectPath = InUprojectPath,
						UBTArgs = InAddArgs,
					});
				}
			}
		}


		public UnrealBuild(BuildCommand Command)
		{
			OwnerCommand = Command;
			BuildProductFiles.Clear();
		}

		public List<string> FindXGEFiles()
		{
			var Result = new List<string>();
			var Root = CommandUtils.CombinePaths(CommandUtils.CmdEnv.LocalRoot, @"\Engine\Intermediate\Build");			
			Result.AddRange(CommandUtils.FindFiles_NoExceptions("*.xge.xml", false, Root));
			Result.Sort();
			return Result;
		}

		public bool ProcessXGEItems(List<XGEItem> Actions, string XGETool, string Args, string TaskFilePath, bool ShowProgress)
		{
			IScope CombineXGEScope = GlobalTracer.Instance.BuildSpan("CombineXGEItemFiles").WithTag("xgeTool", Path.GetFileNameWithoutExtension(XGETool)).StartActive();

			XmlDocument XGETaskDocument;	
			if (!CombineXGEItemFiles(Actions, TaskFilePath, out XGETaskDocument))
			{
				CommandUtils.LogVerbose("Incremental build, apparently everything was up to date, no XGE jobs produced.");
			}
			else
			{
				XmlElement EnvironmentsElement = XGETaskDocument.CreateElement("Environments");// Make sure all the tasks have a unique prefix
				if(ShowProgress)
				{
					List<XmlElement> AllToolElements = new List<XmlElement>();
					foreach(XmlElement EnvironmentElement in EnvironmentsElement.GetElementsByTagName("Environment"))
					{
						foreach(XmlElement ToolsElement in EnvironmentElement.GetElementsByTagName("Tools"))
						{
							foreach(XmlElement ToolElement in ToolsElement.GetElementsByTagName("Tool"))
							{
								AllToolElements.Add(ToolElement);
							}
						}
					}
					for(int Idx = 0; Idx < AllToolElements.Count; Idx++)
					{
						XmlElement ToolElement = AllToolElements[Idx];
						if (ToolElement.HasAttribute("OutputPrefix"))
						{
							ToolElement.SetAttribute("OutputPrefix", ToolElement.Attributes["OutputPrefix"].Value + String.Format(" [@progress increment 1/{0}]", AllToolElements.Count));
						}
						else
						{
							ToolElement.SetAttribute("OutputPrefix", String.Format(" [@progress increment 1/{0} skipline]", AllToolElements.Count));
						}
					}
				}

				// Write the XGE task XML to a temporary file.
				using (FileStream OutputFileStream = new FileStream(TaskFilePath, FileMode.Create, FileAccess.Write))
				{
					XGETaskDocument.Save(OutputFileStream);
				}
				if (!CommandUtils.FileExists(TaskFilePath))
				{
					throw new UnrealBuildException("Unable to find xge xml: " + TaskFilePath);
				}

				CombineXGEScope.Span.Finish();

				if(XGETool == null)
				{
					CommandUtils.PushDir(CommandUtils.CombinePaths(CommandUtils.CmdEnv.LocalRoot, @"\Engine\Source"));
					try
					{
						int ExitCode = ParallelExecutor.Execute(TaskFilePath, OwnerCommand.ParseParam("StopOnErrors"));
						if(ExitCode != 0)
						{
							return false;
						}
					}
					finally
					{
						CommandUtils.PopDir();
					}
				}
				else
				{
					using (IScope Scope = GlobalTracer.Instance.BuildSpan("ProcessXGE").WithTag("xgeTool", Path.GetFileNameWithoutExtension(XGETool)).StartActive())
					{
						int ConnectionRetries = 4;
						while (true)
						{
							CommandUtils.LogVerbose("Running {0} *******", XGETool);
							CommandUtils.PushDir(CommandUtils.CombinePaths(CommandUtils.CmdEnv.LocalRoot, @"\Engine\Source"));
							int SuccesCode;
							string LogFile = CommandUtils.GetRunAndLogOnlyName(CommandUtils.CmdEnv, XGETool);
							string Output = CommandUtils.RunAndLog(XGETool, Args, out SuccesCode, LogFile);
							bool bOutputContainsProject = Output.Contains("------Project:");
							CommandUtils.PopDir();
							if (ConnectionRetries > 0 && (SuccesCode == 4 || SuccesCode == 2) && !bOutputContainsProject && XGETool != null)
							{
								CommandUtils.LogWarning(String.Format("{0} failure on the local connection timeout", XGETool));
								if (ConnectionRetries < 2)
								{
									System.Threading.Thread.Sleep(60000);
								}
								ConnectionRetries--;
								continue;
							}
							else if (SuccesCode != 0)
							{
								throw new UnrealBuildException("Command failed (Result:{3}): {0} {1}. See logfile for details: '{2}' ",
																XGETool, Args, Path.GetFileName(LogFile), SuccesCode);
							}
							CommandUtils.LogVerbose("{0} {1} Done *******", XGETool, Args);
							break;
						}
					}
				}
			}
			foreach (var Item in Actions)
			{
				XGEFinishBuildWithUBT(Item);
			}
			return true;
		}

        private static bool CombineXGEItemFiles(List<XGEItem> Actions, string TaskFilePath, out XmlDocument XGETaskDocument)
        {
            XGETaskDocument = new XmlDocument();

			// <BuildSet FormatVersion="1">...</BuildSet>
			XmlElement BuildSetElement = XGETaskDocument.CreateElement("BuildSet");
			XGETaskDocument.AppendChild(BuildSetElement);
			BuildSetElement.SetAttribute("FormatVersion", "1");

			// <Environments>...</Environments>
			XmlElement EnvironmentsElement = XGETaskDocument.CreateElement("Environments");
			BuildSetElement.AppendChild(EnvironmentsElement);

			int Job = 0;
			int Env = 0;
			Dictionary<string, XmlElement> EnvStringToEnv = new Dictionary<string, XmlElement>();
			Dictionary<string, XmlElement> EnvStringToProject = new Dictionary<string, XmlElement>();
			Dictionary<string, string> ParamsToTool = new Dictionary<string, string>();
			Dictionary<string, XmlElement> ParamsToToolElement = new Dictionary<string, XmlElement>();
			Dictionary<string, string> ToolToAction = new Dictionary<string, string>();
			foreach (var Item in Actions)
			{
				var CurrentDependencies = new List<string>();
				foreach (var XGEFile in Item.XgeXmlFiles)
				{
					if (!CommandUtils.FileExists_NoExceptions(XGEFile))
					{
						throw new UnrealBuildException("Couldn't find file: {0}", XGEFile);
					}
					var TargetFile = TaskFilePath + "." + Path.GetFileName(XGEFile);
					CommandUtils.CopyFile(XGEFile, TargetFile);
					CommandUtils.CopyFile_NoExceptions(XGEFile, TaskFilePath);

					XmlReaderSettings XmlSettings = new XmlReaderSettings();
					XmlSettings.DtdProcessing = DtdProcessing.Ignore;
					XmlSettings.XmlResolver = null;

					XmlDocument UBTTask = new XmlDocument();
                    using (XmlReader Reader = XmlReader.Create(XGEFile, XmlSettings))
					{
						UBTTask.Load(Reader);
					}

					CommandUtils.DeleteFile(XGEFile);

					var All = new List<string>();
					{
						var Elements = UBTTask.GetElementsByTagName("Variable");
						foreach (XmlElement Element in Elements)
						{
							string Pair = Element.Attributes["Name"].Value + "=" + Element.Attributes["Value"].Value;
							All.Add(Pair);
						}
					}
					All.Sort();
					string AllString = "";
					foreach (string Element in All)
					{
						AllString += Element + "\n";
					}
					XmlElement ToolsElement;
					XmlElement ProjectElement;

					if (EnvStringToEnv.ContainsKey(AllString))
					{
						ToolsElement = EnvStringToEnv[AllString];
						ProjectElement = EnvStringToProject[AllString];
					}
					else
					{
						string EnvName = string.Format("Env_{0}", Env);
						Env++;
						// <Environment Name="Win32">...</Environment>
						XmlElement EnvironmentElement = XGETaskDocument.CreateElement("Environment");
						EnvironmentsElement.AppendChild(EnvironmentElement);
						EnvironmentElement.SetAttribute("Name", EnvName);

						// <Tools>...</Tools>
						ToolsElement = XGETaskDocument.CreateElement("Tools");
						EnvironmentElement.AppendChild(ToolsElement);

						{
							// <Variables>...</Variables>
							XmlElement VariablesElement = XGETaskDocument.CreateElement("Variables");
							EnvironmentElement.AppendChild(VariablesElement);

							var Elements = UBTTask.GetElementsByTagName("Variable");
							foreach (XmlElement Element in Elements)
							{
								// <Variable>...</Variable>
								XmlElement VariableElement = XGETaskDocument.CreateElement("Variable");
								VariablesElement.AppendChild(VariableElement);
								VariableElement.SetAttribute("Name", Element.Attributes["Name"].Value);
								VariableElement.SetAttribute("Value", Element.Attributes["Value"].Value);
							}
						}

						// <Project Name="Default" Env="Default">...</Project>
						ProjectElement = XGETaskDocument.CreateElement("Project");
						BuildSetElement.AppendChild(ProjectElement);
						ProjectElement.SetAttribute("Name", EnvName);
						ProjectElement.SetAttribute("Env", EnvName);

						EnvStringToEnv.Add(AllString, ToolsElement);
						EnvStringToProject.Add(AllString, ProjectElement);

					}

					Dictionary<string, string> ToolToTool = new Dictionary<string, string>();
					Dictionary<string, string> ActionToAction = new Dictionary<string, string>();

					{
						var Elements = UBTTask.GetElementsByTagName("Tool");
						foreach (XmlElement Element in Elements)
						{
							string Key = Element.Attributes["Path"].Value;
							Key += " ";
							Key += Element.Attributes["Params"].Value;

							//hack hack hack
							string ElementParams = Element.Attributes["Params"].Value;
							if (!String.IsNullOrEmpty(ElementParams))
							{
								int YcIndex = ElementParams.IndexOf(" /Yc\"");
								if (YcIndex >= 0)
								{
									// /Fp&quot;D:\BuildFarm\buildmachine_++depot+UE4\Engine\Intermediate\BuildData\Win64\UnrealEditor\Development\SharedPCHs\CoreUObject.h.pch&quot
									string Fp = " /Fp\"";
									int FpIndex = ElementParams.IndexOf(Fp, YcIndex);
									if (FpIndex >= 0)
									{
										int EndIndex = ElementParams.IndexOf("\"", FpIndex + Fp.Length);
										if (EndIndex >= 0)
										{
											string PCHFileName = ElementParams.Substring(FpIndex + Fp.Length, EndIndex - FpIndex - Fp.Length);
											if (PCHFileName.Contains(@"\SharedPCHs\") && PCHFileName.Contains(@"\UnrealEditor\"))
											{
												Key = "SharedEditorPCH$ " + PCHFileName;
												CommandUtils.LogLog("Hack: detected Shared PCH, which will use a different key {0}", Key);
											}
										}
									}
								}

							}

							string ToolName = string.Format("{0}_{1}", Element.Attributes["Name"].Value, Job);
							string OriginalToolName = ToolName;

							if (ParamsToTool.ContainsKey(Key))
							{
								ToolName = ParamsToTool[Key];
								ToolToTool.Add(OriginalToolName, ToolName);

								XmlElement ToolElement = ParamsToToolElement[Key];
								ToolElement.SetAttribute("GroupPrefix", ToolElement.Attributes["GroupPrefix"].Value + " + " + Item.OutputCaption);
							}
							else
							{
								// <Tool ... />
								XmlElement ToolElement = XGETaskDocument.CreateElement("Tool");
								ToolsElement.AppendChild(ToolElement);

								ParamsToTool.Add(Key, ToolName);
								ParamsToToolElement.Add(Key, ToolElement);

								ToolElement.SetAttribute("Name", ToolName);
								ToolElement.SetAttribute("AllowRemote", Element.Attributes["AllowRemote"].Value);
								if (Element.HasAttribute("OutputPrefix"))
								{
									ToolElement.SetAttribute("OutputPrefix", Element.Attributes["OutputPrefix"].Value);
								}
								ToolElement.SetAttribute("GroupPrefix", "** For " + Item.OutputCaption);

								ToolElement.SetAttribute("Params", Element.Attributes["Params"].Value);
								ToolElement.SetAttribute("Path", Element.Attributes["Path"].Value);
								if(Element.HasAttribute("VCCompiler"))
								{
									ToolElement.SetAttribute("VCCompiler", Element.Attributes["VCCompiler"].Value);
								}
								ToolElement.SetAttribute("SkipIfProjectFailed", Element.Attributes["SkipIfProjectFailed"].Value);
								if (Element.HasAttribute("AutoReserveMemory"))
								{
									ToolElement.SetAttribute("AutoReserveMemory", Element.Attributes["AutoReserveMemory"].Value);
								}
								ToolElement.SetAttribute("OutputFileMasks", Element.Attributes["OutputFileMasks"].Value);
								if(Element.HasAttribute("AutoRecover"))
								{
									ToolElement.SetAttribute("AutoRecover", Element.Attributes["AutoRecover"].Value);
								}
								//ToolElement.SetAttribute("AllowRestartOnLocal", "false");  //vs2012 can't really restart, so we will go with this for now
								if (Element.Attributes["OutputFileMasks"].Value == "PCLaunch.rc.res")
								{
									// total hack, when doing clean compiles, this output directory does not exist, we need to create it now
									string Parms = Element.Attributes["Params"].Value;
									string Start = "/fo \"";
									int StartIndex = Parms.IndexOf(Start);
									if (StartIndex >= 0)
									{
										Parms = Parms.Substring(StartIndex + Start.Length);
										int EndIndex = Parms.IndexOf("\"");
										if (EndIndex > 0)
										{
											string ResLocation = CommandUtils.CombinePaths(Parms.Substring(0, EndIndex));
											if (!CommandUtils.DirectoryExists_NoExceptions(CommandUtils.GetDirectoryName(ResLocation)))
											{
												CommandUtils.CreateDirectory(CommandUtils.GetDirectoryName(ResLocation));
											}
										}
									}
								}
							}
						}
					}
					{
						var NextDependencies = new List<string>();

						var Elements = UBTTask.GetElementsByTagName("Task");
						foreach (XmlElement Element in Elements)
						{
							string ToolName = string.Format("{0}_{1}", Element.Attributes["Tool"].Value, Job);
							string ActionName = string.Format("{0}_{1}", Element.Attributes["Name"].Value, Job);
							string OriginalActionName = ActionName;

							if (ToolToTool.ContainsKey(ToolName))
							{
								ToolName = ToolToTool[ToolName];
								ActionName = ToolToAction[ToolName];
								ActionToAction.Add(OriginalActionName, ActionName);
							}
							else
							{
								ActionToAction.Add(OriginalActionName, ActionName);
								ToolToAction.Add(ToolName, ActionName);
								// <Task ... />
								XmlElement TaskElement = XGETaskDocument.CreateElement("Task");
								ProjectElement.AppendChild(TaskElement);

								TaskElement.SetAttribute("SourceFile", Element.Attributes["SourceFile"].Value);
								if (Element.HasAttribute("Caption"))
								{
									TaskElement.SetAttribute("Caption", Element.Attributes["Caption"].Value);
								}
								TaskElement.SetAttribute("Name", ActionName);
								NextDependencies.Add(ActionName);
								TaskElement.SetAttribute("Tool", ToolName);
								TaskElement.SetAttribute("WorkingDir", Element.Attributes["WorkingDir"].Value);
								TaskElement.SetAttribute("SkipIfProjectFailed", Element.Attributes["SkipIfProjectFailed"].Value);

								string NewDepends = "";
								if (Element.HasAttribute("DependsOn"))
								{
									string Depends = Element.Attributes["DependsOn"].Value;
									while (Depends.Length > 0)
									{
										string ThisAction = Depends;
										int Semi = Depends.IndexOf(";");
										if (Semi >= 0)
										{
											ThisAction = Depends.Substring(0, Semi);
											Depends = Depends.Substring(Semi + 1);
										}
										else
										{
											Depends = "";
										}
										if (ThisAction.Length > 0)
										{
											if (NewDepends.Length > 0)
											{
												NewDepends += ";";
											}
											string ActionJob = ThisAction + string.Format("_{0}", Job);
											if (!ActionToAction.ContainsKey(ActionJob))
											{
												throw new UnrealBuildException("Action not found '{0}' in {1}->{2}", ActionJob, XGEFile, TargetFile);
												// the XGE schedule is not topologically sorted. Hmmm. Well, we make a scary assumption here that this 
											}
											NewDepends += ActionToAction[ActionJob];
										}
									}
								}
								foreach (var Dep in CurrentDependencies)
								{
									if (NewDepends.Length > 0)
									{
										NewDepends += ";";
									}
									NewDepends += Dep;
								}
								if (NewDepends != "")
								{
									TaskElement.SetAttribute("DependsOn", NewDepends);
								}
							}

						}
						CurrentDependencies.AddRange(NextDependencies);
					}
					Job++;
				}
			}
			return (Job > 0);
		}

		public void ClearExportedXGEXML()
		{
			foreach (var XGEFile in FindXGEFiles())
			{
				CommandUtils.DeleteFile(XGEFile);
			}
		}

		public bool CanUseXGE(UnrealTargetPlatform Platform)
		{
			return PlatformExports.CanUseXGE(Platform, Log.Logger);
		}

		public bool CanUseParallelExecutor(UnrealTargetPlatform Platform)
		{
			return PlatformExports.CanUseParallelExecutor(Platform, Log.Logger);
		}

		private bool ParseParam(string Name)
		{
			return OwnerCommand != null && OwnerCommand.ParseParam(Name);
		}

		private string ParseParamValue(string Name)
		{
			return (OwnerCommand != null)? OwnerCommand.ParseParamValue(Name) : null;
		}

		private int ParseParamInt(string Name, int Default = 0)
		{
			return (OwnerCommand != null)? OwnerCommand.ParseParamInt(Name, Default) : Default;
		}

		/// <summary>
		/// Executes a build.
		/// </summary>
		/// <param name="Agenda">Build agenda.</param>
		/// <param name="InDeleteBuildProducts">if specified, determines if the build products will be deleted before building. If not specified -clean parameter will be used,</param>
		/// <param name="InUpdateVersionFiles">True if the version files are to be updated </param>
		/// <param name="InForceNoXGE">If true will force XGE off</param>
		/// <param name="InUseParallelExecutor">If true AND XGE not present or not being used then use ParallelExecutor</param>
		public void Build(BuildAgenda Agenda, bool? InDeleteBuildProducts = null, bool InUpdateVersionFiles = true, bool InForceNoXGE = false, bool InUseParallelExecutor = false, bool InShowProgress = false, int? InChangelistNumberOverride = null, Dictionary<BuildTarget, BuildManifest> InTargetToManifest = null)
		{
			if (!CommandUtils.CmdEnv.HasCapabilityToCompile)
			{
				throw new UnrealBuildException("You are attempting to compile on a machine that does not have a supported compiler!");
			}
			bool DeleteBuildProducts = InDeleteBuildProducts.HasValue ? InDeleteBuildProducts.Value : ParseParam("Clean");
			if (InUpdateVersionFiles)
			{
				UpdateVersionFiles(ActuallyUpdateVersionFiles: true, ChangelistNumberOverride: InChangelistNumberOverride);
			}

			//////////////////////////////////////

			// make a set of unique platforms involved
			var UniquePlatforms = new List<UnrealTargetPlatform>();
			foreach (var Target in Agenda.Targets)
			{
				if (!UniquePlatforms.Contains(Target.Platform))
				{
					UniquePlatforms.Add(Target.Platform);
				}
			}

			if (Agenda.SwarmAgentProject != "")
			{
				string SwarmAgentSolution = Path.Combine(CommandUtils.CmdEnv.LocalRoot, Agenda.SwarmAgentProject);
				CommandUtils.BuildSolution(CommandUtils.CmdEnv, SwarmAgentSolution, "Development", "Mixed Platforms");
				AddSwarmBuildProducts();
			}

			if (Agenda.SwarmCoordinatorProject != "")
			{
				string SwarmCoordinatorSolution = Path.Combine(CommandUtils.CmdEnv.LocalRoot, Agenda.SwarmCoordinatorProject);
				CommandUtils.BuildSolution(CommandUtils.CmdEnv, SwarmCoordinatorSolution, "Development", "Mixed Platforms");
				AddSwarmBuildProducts();
			}
				
			foreach (var DotNetProject in Agenda.DotNetProjects)
			{
				string CsProj = Path.Combine(CommandUtils.CmdEnv.LocalRoot, DotNetProject);
				CommandUtils.BuildCSharpProject(CommandUtils.CmdEnv, CsProj);
				AddBuildProductsForCSharpProj(CsProj);
			}

			string XGEConsole = null;
			bool bDisableXGE = ParseParam("NoXGE") || InForceNoXGE;
			bool bCanUseXGE = !bDisableXGE && PlatformExports.TryGetXgConsoleExecutable(out XGEConsole);

			// only run ParallelExecutor if not running XGE (and we've requested ParallelExecutor and it exists)
			bool bCanUseParallelExecutor = InUseParallelExecutor && (HostPlatform.Current.HostEditorPlatform == UnrealTargetPlatform.Win64);
			CommandUtils.LogLog("************************* UnrealBuild:");
			CommandUtils.LogLog("************************* UseXGE: {0}", bCanUseXGE);
			CommandUtils.LogLog("************************* UseParallelExecutor: {0}", bCanUseParallelExecutor);

			// Clean all the targets
			foreach (BuildTarget Target in Agenda.Targets)
			{
				bool bClean = Target.Clean ?? DeleteBuildProducts;
				if (bClean)
				{
					CleanWithUBT(Target.TargetName, Target.Platform, Target.Config, Target.UprojectPath, Target.UBTArgs);
				}
			}

			// Filter the targets into those which can be built in parallel, vs those that must be executed serially
			List<BuildTarget> NormalTargets = new List<BuildTarget>();
			List<BuildTarget> ParallelXgeTargets = new List<BuildTarget>();
			List<BuildTarget> ParallelTargets = new List<BuildTarget>();
			foreach (BuildTarget Target in Agenda.Targets)
			{
				if(Target.TargetName == "UnrealHeaderTool")
				{
					NormalTargets.Insert(0, Target);
				}
				else if(bCanUseXGE && CanUseXGE(Target.Platform))
				{
					ParallelXgeTargets.Add(Target);
				}
				else if(bCanUseParallelExecutor && CanUseParallelExecutor(Target.Platform))
				{
					ParallelTargets.Add(Target);
				}
				else
				{
					NormalTargets.Add(Target);
				}
			}

			// Execute all the serial targets
			foreach(BuildTarget Target in NormalTargets)
			{
				// When building a target for Mac or iOS, use UBT's -flushmac option to clean up the remote builder
				bool bForceFlushMac = DeleteBuildProducts && (Target.Platform == UnrealTargetPlatform.Mac || Target.Platform == UnrealTargetPlatform.IOS);
				BuildManifest Manifest = BuildWithUBT(Target.TargetName, Target.Platform, Target.Config, Target.UprojectPath, bForceFlushMac, bDisableXGE, Target.UBTArgs);
				if(InTargetToManifest != null)
				{
					InTargetToManifest[Target] = Manifest;
				}
			}

			// Execute all the XGE targets
			if(ParallelXgeTargets.Count > 0)
			{
				BuildParallelTargets(ParallelXgeTargets, InShowProgress, XGEConsole, InTargetToManifest);
			}

			// Execute all the parallel targets
			if(ParallelTargets.Count > 0)
			{
				BuildParallelTargets(ParallelTargets, InShowProgress, null, InTargetToManifest);
			}
		}

		private void BuildParallelTargets(List<BuildTarget> ParallelTargets, bool InShowProgress, string XGETool, Dictionary<BuildTarget, BuildManifest> InTargetToManifest)
		{
			string TaskFilePath = CommandUtils.CombinePaths(CommandUtils.CmdEnv.LogFolder, @"UAT_XGE.xml");

			CommandUtils.LogSetProgress(InShowProgress, "Generating headers...");

			List<XGEItem> XGEItems = new List<XGEItem>();
			foreach (BuildTarget Target in ParallelTargets)
			{
				XGEItem Item = XGEPrepareBuildWithUBT(Target.TargetName, Target.Platform, Target.Config, Target.UprojectPath, Target.UBTArgs);
				if(InTargetToManifest != null)
				{
					InTargetToManifest[Target] = Item.Manifest;
				}
				XGEItems.Add(Item);
			}

			string Args = null;
			if (XGETool != null) 
			{
				Debug.Assert(OperatingSystem.IsWindows());

				Args = "\"" + TaskFilePath + "\" /Rebuild /NoLogo /ShowAgent /ShowTime";
				if (ParseParam("StopOnErrors"))
				{
					Args += " /StopOnErrors";
				}

				// A bug in the UCRT can cause XGE to hang on VS2015 builds. Figure out if this hang is likely to effect this build and workaround it if able.
				string XGEVersion = Microsoft.Win32.Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Xoreax\IncrediBuild\Builder", "Version", null) as string;
				if (XGEVersion != null)
				{
					// Per Xoreax support, subtract 1001000 from the registry value to get the build number of the installed XGE.
					int XGEBuildNumber;
					if (Int32.TryParse(XGEVersion, out XGEBuildNumber) && XGEBuildNumber - 1001000 >= 1659)
					{
						Args += " /no_watchdog_thread";
					}
				}
			}

			CommandUtils.LogSetProgress(InShowProgress, "Building...");
			if (!ProcessXGEItems(XGEItems, XGETool, Args, TaskFilePath, InShowProgress))
			{
				throw new UnrealBuildException("{0} failed, retries not enabled:", XGETool);
			}
		}

		/// <summary>
		/// Checks to make sure there was at least one build product, and that all files exist.  Also, logs them all out.
		/// </summary>
		/// <param name="BuildProductFiles">List of files</param>
		public static void CheckBuildProducts(HashSet<string> BuildProductFiles)
		{
			// Check build products
			{
				CommandUtils.LogLog("Build products *******");
				if (BuildProductFiles.Count < 1)
				{
					CommandUtils.LogInformation("No build products were made");
				}
				else
				{
					foreach (var Product in BuildProductFiles)
					{
						if (!CommandUtils.FileExists(Product) && !CommandUtils.DirectoryExists(Product))
						{
							throw new UnrealBuildException("{0} was a build product but no longer exists", Product);
						}
						CommandUtils.LogLog(Product);
					}
				}
				CommandUtils.LogLog("End Build products *******");
			}
		}


		/// <summary>
		/// Adds or edits existing files at head revision, expecting an exclusive lock, resolving by clobbering any existing version
		/// </summary>
		/// <param name="Files">List of files to check out</param>
		public static void AddBuildProductsToChangelist(int WorkingCL, IEnumerable<string> Files)
		{
			CommandUtils.LogInformation("Adding {0} build products to changelist {1}...", Files.Count(), WorkingCL);
			foreach (var File in Files)
			{
				CommandUtils.P4.Sync("-f -k " + CommandUtils.MakePathSafeToUseWithCommandLine(File) + "#head"); // sync the file without overwriting local one
				if (!CommandUtils.FileExists(File))
				{
					throw new UnrealBuildException("{0} was a build product but no longer exists", File);
				}

				CommandUtils.P4.ReconcileNoDeletes(WorkingCL, CommandUtils.MakePathSafeToUseWithCommandLine(File));

				// Change file type on binary files to be always writeable.
				var FileStats = CommandUtils.P4.FStat(File);

                if (CommandUtils.IsProbablyAMacOrIOSExe(File))
                {
                    if (FileStats.Type == P4FileType.Binary && (FileStats.Attributes & (P4FileAttributes.Executable | P4FileAttributes.Writeable)) != (P4FileAttributes.Executable | P4FileAttributes.Writeable))
                    {
                        CommandUtils.P4.ChangeFileType(File, (P4FileAttributes.Executable | P4FileAttributes.Writeable));
                    }
                }
                else
                {
					if (IsBuildProduct(File, FileStats) && (FileStats.Attributes & P4FileAttributes.Writeable) != P4FileAttributes.Writeable)
                    {
                        CommandUtils.P4.ChangeFileType(File, P4FileAttributes.Writeable);
                    }

                }                    
			}
		}

		/// <summary>
		/// Determines if this file is a build product.
		/// </summary>
		/// <param name="File">File path</param>
		/// <param name="FileStats">P4 file stats.</param>
		/// <returns>True if this is a Windows build product. False otherwise.</returns>
		private static bool IsBuildProduct(string File, P4FileStat FileStats)
		{
			if(FileStats.Type == P4FileType.Binary || IsBuildReceipt(File))
			{
				return true;
			}

			return FileStats.Type == P4FileType.Text && File.EndsWith(".exe.config", StringComparison.InvariantCultureIgnoreCase);
		}

		/// <summary>
		/// Add UBT files to build products
		/// </summary>
		public void AddUBTFilesToBuildProducts()
		{
			string UBTLocation = UnrealBuildToolDll.Directory.FullName;
			// copy all the files from the UBT output directory
			string[] UBTFiles = CommandUtils.FindFiles_NoExceptions("*.*", true, UBTLocation);

			foreach (string UBTFile in UBTFiles)
			{
				AddBuildProduct(UBTFile);
			}
		}

		/// <summary>
		/// Copy the UAT files to their precompiled location, and add them as build products
		/// </summary>
		public void AddUATFilesToBuildProducts()
		{
			// All scripts are expected to exist in DotNET/AutomationScripts subfolder.
			foreach (FileReference BuildProduct in ScriptManager.BuildProducts)
			{
				string UATScriptFilePath = BuildProduct.FullName;
				if (!CommandUtils.FileExists_NoExceptions(UATScriptFilePath))
				{
					throw new UnrealBuildException("Cannot add UAT to the build products because {0} does not exist.", UATScriptFilePath);
				}
				AddBuildProduct(UATScriptFilePath);
			}
		}

		FileReference GetManifestFile(FileReference ProjectFile)
		{
			// Can't write to Engine directory on installed builds
			if (Unreal.IsEngineInstalled() && ProjectFile != null)
			{
				return FileReference.Combine(ProjectFile.Directory, "Intermediate", "Build", "Manifest.xml");
			}
			else
			{
				return FileReference.Combine(Unreal.EngineDirectory, "Intermediate", "Build", "Manifest.xml");
			}
		}

		[Obsolete("Deprecated in UE5.1; use UnrealBuildToolDll")]
		public static string GetUBTExecutable()
		{
			return CommandUtils.CombinePaths(CommandUtils.CmdEnv.LocalRoot, @"Engine/Binaries/DotNET/UnrealBuildTool/UnrealBuildTool" + (RuntimePlatform.IsWindows ? ".exe" : ""));
		}

		[Obsolete("Deprecated in UE5.1; use UnrealBuildToolDll")]
		public string UBTExecutable
		{
			get
			{
				return GetUBTExecutable();							
			}
		}

		public static FileReference UnrealBuildToolDll => 
			FileReference.FromString(CommandUtils.CombinePaths(CommandUtils.CmdEnv.LocalRoot, "Engine/Binaries/DotNET/UnrealBuildTool/UnrealBuildTool.dll"));

		// List of everything we built so far
		public readonly HashSet<string> BuildProductFiles = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase);
	}
}