// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Diagnostics;
using System.Linq;
using System.Security.AccessControl;
using System.Xml;
using System.Text;
using System.Text.RegularExpressions;

namespace UnrealBuildTool
{
	public abstract class RemoteToolChain : UEToolChain
    {
		protected void RegisterRemoteToolChain(UnrealTargetPlatform InPlatform, CPPTargetPlatform CPPPlatform)
		{
			RemoteToolChainPlatform = InPlatform;

			// Register this tool chain for IOS
			Log.TraceVerbose("        Registered for {0}", CPPPlatform.ToString());
			UEToolChain.RegisterPlatformToolChain(CPPPlatform, this);
		}

		/** These two variables will be loaded from XML config file in XmlConfigLoader.Init() */
		[XmlConfig]
		public static string RemoteServerName = "";
		[XmlConfig]
		public static string[] PotentialServerNames = new string[] { };

		/** Keep a list of remote files that are potentially copied from local to remote */
		private static Dictionary<FileItem, FileItem> CachedRemoteFileItems = new Dictionary<FileItem, FileItem>();

		/** The base path (on the Mac) to the your particular development directory, where files will be copied to from the PC */
		public static string UserDevRootMacBase = "/UE4/Builds/";

		/** The final path (on the Mac) to your particular development directory, where files will be copied to from the PC */
		public static string UserDevRootMac = "/UE4/Builds";

		/** Whether or not to connect to UnrealRemoteTool using RPCUtility */
		[XmlConfig]
		public static bool bUseRPCUtil = true;
		
		/** Path to rsync executable and parameters for your rsync utility */
		[XmlConfig]
		public static string RSyncExe = "${PROGRAM_FILES}\\DeltaCopy\\rsync.exe";
		public static string ResolvedRSyncExe = null;

		/** Path to rsync executable and parameters for your rsync utility */
		[XmlConfig]
		public static string SSHExe = "${PROGRAM_FILES}\\DeltaCopy\\ssh.exe";
		public static string ResolvedSSHExe = null;

		/** Instead of looking for RemoteToolChainPrivate.key in the usual places (Documents/Unreal Engine/UnrealBuildTool/SSHKeys, Engine/Build/SSHKeys), this private key will be used if set */
		[XmlConfig]
		public static string SSHPrivateKeyOverridePath = "";
		public static string ResolvedSSHPrivateKey = null;

		/** The authentication used for Rsync (for the -e rsync flag) */
		[XmlConfig]
		public static string RsyncAuthentication = "ssh -i '${CYGWIN_SSH_PRIVATE_KEY}'";
		public static string ResolvedRsyncAuthentication = null;

		/** The authentication used for SSH (probably similar to RsyncAuthentication) */
		[XmlConfig]
		public static string SSHAuthentication = "-i '${CYGWIN_SSH_PRIVATE_KEY}'";
		public static string ResolvedSSHAuthentication = null;

		/** Username on the remote machine to connect to with RSync */
		[XmlConfig]
		public static string RSyncUsername = "${CURRENT_USER}";
		public static string ResolvedRSyncUsername = null;

		// has the toolchain initialized remote execution yet? no need to do it multiple times
		private static bool bHasBeenInitialized = false;

		/** The directory that this local branch is in, without drive information (strip off X:\ from X:\UE4\iOS) */
		public static string BranchDirectory = Path.GetFullPath(".\\");


        /** Substrings that indicate a line contains an error */
        protected static List<string> ErrorMessageTokens;

		/** The platform this toolchain is compiling for */
		protected UnrealTargetPlatform RemoteToolChainPlatform;

		/** The average amound of memory a compile takes, used so that we don't compile too many things at once */
		public static int MemoryPerCompileMB = 1000;

		static RemoteToolChain()
        {
            ErrorMessageTokens = new List<string>();
            ErrorMessageTokens.Add("ERROR ");
            ErrorMessageTokens.Add("** BUILD FAILED **");
            ErrorMessageTokens.Add("[BEROR]");
            ErrorMessageTokens.Add("IPP ERROR");
            ErrorMessageTokens.Add("System.Net.Sockets.SocketException");

			BranchDirectory = BranchDirectory.Replace("Engine\\Binaries\\DotNET", "");
			BranchDirectory = BranchDirectory.Replace("Engine\\Source\\", "");
		}

		private static string ResolveString(string Input, bool bIsPath)
		{
			string Result = Input;

			// these assume entire string is a path, and will do file operations on the whole string
			if (bIsPath)
			{
				if (Result.Contains("${PROGRAM_FILES}"))
				{
					// first look in real ProgramFiles
					string Temp = Result.Replace("${PROGRAM_FILES}", Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles, Environment.SpecialFolderOption.DoNotVerify));
					if (File.Exists(Temp) || Directory.Exists(Temp))
					{
						Result = Temp;
					}
					else
					{
						// fallback to ProgramFilesX86
						Temp = Result.Replace("${PROGRAM_FILES}", Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86, Environment.SpecialFolderOption.DoNotVerify));
						if (File.Exists(Temp) || Directory.Exists(Temp))
						{
							Result = Temp;
						}
					}
				}

				if (Result.Contains("${ENGINE_ROOT}"))
				{
					string Temp = Result.Replace("${ENGINE_ROOT}", Path.GetFullPath(BuildConfiguration.RelativeEnginePath + "\\.."));

					// get the best version
					Result = LookForSpecialFile(Temp);
				}

				if (Result.Contains("${PROJECT_ROOT}"))
				{
					if (!UnrealBuildTool.HasUProjectFile())
					{
						throw new BuildException("Configuration setting was using ${PROJECT_ROOT}, but there was no project specified");
					}

					string Temp = Result.Replace("${PROJECT_ROOT}", Path.GetFullPath(UnrealBuildTool.GetUProjectPath()));
					
					// get the best version
					Result = LookForSpecialFile(Temp);
				}
			}

			// non path variables
			Result = Result.Replace("${CURRENT_USER}", Environment.UserName);

			// needs a resolved key (which isn't required if user is using alternate authentication)
			if (Result.Contains("${SSH_PRIVATE_KEY}") || Result.Contains("${CYGWIN_SSH_PRIVATE_KEY}"))
			{
				// if it needs the key, then make sure we have it!
				if (ResolvedSSHPrivateKey != null)
				{
					Result = Result.Replace("${SSH_PRIVATE_KEY}", ResolvedSSHPrivateKey);
					Result = Result.Replace("${CYGWIN_SSH_PRIVATE_KEY}", ConvertPathToCygwin(ResolvedSSHPrivateKey));
				}
				else
				{
					Result = null;
				}
			}

			return Result;
		}

		private static string LookForSpecialFile(string InPath)
		{
			// look in special NotForLicensees dir first
			string Special = Path.Combine(Path.GetDirectoryName(InPath), "NoRedist", Path.GetFileName(InPath));
			if (File.Exists(Special) || Directory.Exists(Special))
			{
				return Special;
			}

			Special = Path.Combine(Path.GetDirectoryName(InPath), "NotForLicensees", Path.GetFileName(InPath));
			if (File.Exists(Special) || Directory.Exists(Special))
			{
				return Special;
			}

			return InPath;
		}

		// Look for any build options in the engine config file.
		public override void ParseProjectSettings()
		{
			base.ParseProjectSettings();

			ConfigCacheIni Ini = new ConfigCacheIni(UnrealTargetPlatform.IOS, "Engine", UnrealBuildTool.GetUProjectPath());
			string ServerName = RemoteServerName;
			if (Ini.GetString("/Script/IOSRuntimeSettings.IOSRuntimeSettings", "RemoteServerName", out ServerName) && !String.IsNullOrEmpty(ServerName))
			{
				RemoteServerName = ServerName;
			}

			bool bUseRSync = false;
			if (Ini.GetBool("/Script/IOSRuntimeSettings.IOSRuntimeSettings", "bUseRSync", out bUseRSync))
			{
				bUseRPCUtil = !bUseRSync;
				Ini.GetString("/Script/IOSRuntimeSettings.IOSRuntimeSettings", "RSyncUsername", out RSyncUsername);

				string ConfigKeyPath;
				if (Ini.GetString("/Script/IOSRuntimeSettings.IOSRuntimeSettings", "SSHPrivateKeyOverridePath", out ConfigKeyPath))
				{
					if (File.Exists(ConfigKeyPath))
					{
						SSHPrivateKeyOverridePath = ConfigKeyPath;
					}
				}
			}
		}

		// Gather a users root path from the remote server. Should only be called once.
		public static void SetUserDevRootFromServer()
		{
			if (!bUseRPCUtil)
			{
				// Only set relative to the users root when using rsync, for now
				Hashtable Results = RPCUtilHelper.Command("/", "echo $HOME", null);

				if (Results == null)
				{
					Log.TraceInformation("UserDevRoot Command failed to execute!");
				}
				else if (Results["CommandOutput"] != null)
				{
					// pass back the string
					string HomeLocation = Results["CommandOutput"] as string;
					UserDevRootMac = HomeLocation + UserDevRootMacBase;
				}
			}
			else
			{
				UserDevRootMac = UserDevRootMacBase;
			}
		}

        // Do any one-time, global initialization for the tool chain
		static int InitializationErrorCode = 0;
		private static int InitializeRemoteExecution()
        {
			if (bHasBeenInitialized)
			{
				return InitializationErrorCode;
			}

            if (BuildHostPlatform.Current.Platform != UnrealTargetPlatform.Mac)
            {
            	// If we don't care which machine we're going to build on, query and
            	// pick the one with the most free command slots available
				if (RemoteServerName == "best_available")
            	{
					int AvailableSlots = 0;
					int Attempts = 0;
					if (!ProjectFileGenerator.bGenerateProjectFiles)
					{
						Log.TraceInformation("Picking a random Mac builder...");
					}
					while (AvailableSlots < 2 && Attempts < 20)
					{
						RemoteServerName = PotentialServerNames.OrderBy(x => Guid.NewGuid()).FirstOrDefault();
						
						// make sure it's ready to take commands
						AvailableSlots = GetAvailableCommandSlotCount(RemoteServerName);

						Attempts++;
					}

					// make sure it succeeded
					if (AvailableSlots <= 1)
					{
						throw new BuildException("Failed to find a Mac available to take commands!");
					}
					else if (!ProjectFileGenerator.bGenerateProjectFiles)
					{
						Log.TraceInformation("Chose {0} after {1} attempts to find a Mac, with {2} slots", RemoteServerName, Attempts, AvailableSlots);
					}
/*
 * this does not work right, because it pushes a lot of tasks to machines that have substantially more slots than others
					Log.TraceInformation("Picking the best available Mac builder...");
                	Int32 MostAvailableCount = Int32.MinValue;
					foreach (string NextMacName in PotentialServerNames)
                	{
                    	Int32 NextAvailableCount = GetAvailableCommandSlotCount(NextMacName);
                    	if (NextAvailableCount > MostAvailableCount)
                    	{
                        	MostAvailableName = NextMacName;
                        	MostAvailableCount = NextAvailableCount;
                    	}

						Log.TraceVerbose("... " + NextMacName + " has " + NextAvailableCount + " slots available");
                	}
                	Log.TraceVerbose("Picking the compile server with the most available command slots: " + MostAvailableName);

                	// Finally, assign the name of the Mac we're going to use
					RemoteServerName = MostAvailableName;
 */
            	}
				else if (!ProjectFileGenerator.bGenerateProjectFiles)
				{
					Log.TraceInformation("Picking the default remote server " + RemoteServerName);
				}

				// we need a server name!
				if (string.IsNullOrEmpty(RemoteServerName))
				{
					Log.TraceError("Remote compiling requires a server name. Use the editor to set up your remote compilation settings.");
					InitializationErrorCode = 99;
				}

				if (!bUseRPCUtil)
				{
					// we need the RemoteServerName and the Username to find the private key
					ResolvedRSyncUsername = ResolveString(RSyncUsername, false);

					bool bFoundOverrideSSHPrivateKey = false;

					// if the override path is set, just use it directly
					if (!string.IsNullOrEmpty(SSHPrivateKeyOverridePath))
					{
						ResolvedSSHPrivateKey = ResolveString(SSHPrivateKeyOverridePath, true);
						
						bFoundOverrideSSHPrivateKey = File.Exists(ResolvedSSHPrivateKey);
						
						// make sure it exists
						if (!bFoundOverrideSSHPrivateKey)
						{
							Log.TraceWarning("An SSHKey override was specified [" + SSHPrivateKeyOverridePath + "] but it doesn't exist. Looking elsewhere...");
						}
					}

					if (!bFoundOverrideSSHPrivateKey)
					{
						// all the places to look for a key
						string[] Locations = new string[] {
							Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Unreal Engine", "UnrealBuildTool"),
							Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "Unreal Engine", "UnrealBuildTool"),
							Path.Combine(UnrealBuildTool.GetUProjectPath(), "Build", "NotForLicensees"),
							Path.Combine(UnrealBuildTool.GetUProjectPath(), "Build", "NoRedist"),
							Path.Combine(UnrealBuildTool.GetUProjectPath(), "Build"),
							Path.Combine(BuildConfiguration.RelativeEnginePath, "Build", "NotForLicensees"),
							Path.Combine(BuildConfiguration.RelativeEnginePath, "Build", "NoRedist"),
							Path.Combine(BuildConfiguration.RelativeEnginePath, "Build"),
						};

						// look for a key file
						foreach (string Location in Locations)
						{
							string KeyPath = Path.Combine(Location, "SSHKeys", RemoteServerName, ResolvedRSyncUsername, "RemoteToolChainPrivate.key");
							if (File.Exists(KeyPath))
							{
								ResolvedSSHPrivateKey = KeyPath;
								bFoundOverrideSSHPrivateKey = true;
								break;
							}
						}
					}

/*					if (!bFoundOverrideSSHPrivateKey)
					{
						throw new BuildException("An SSHKey was required, but one cannot be found. Can't continue...");
					}*/

					// resolve the rest of the strings
					ResolvedRSyncExe = ResolveString(RSyncExe, true);
					ResolvedSSHExe = ResolveString(SSHExe, true);
					ResolvedRsyncAuthentication = ResolveString(RsyncAuthentication, false);
					ResolvedSSHAuthentication = ResolveString(SSHAuthentication, false);
				}

				// start up remote communication and record if it succeeds
				InitializationErrorCode = RPCUtilHelper.Initialize(RemoteServerName);

				// allow user to set up
				if (InitializationErrorCode == 100)
				{
					Process KeyProcess = new Process();
					KeyProcess.StartInfo.WorkingDirectory = Path.GetFullPath(Path.Combine(BuildConfiguration.RelativeEnginePath, "Build", "BatchFiles"));
					KeyProcess.StartInfo.FileName = "MakeAndInstallSSHKey.bat";
					KeyProcess.StartInfo.Arguments = string.Format(
						"\"{0}\" \"{1}\" {2} {3} \"{4}\" \"{5}\" \"{6}\"",
						ResolvedSSHExe,
						ResolvedRSyncExe,
						ResolvedRSyncUsername,
						RemoteServerName,
						Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
						ConvertPathToCygwin(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)),
						Path.GetFullPath(BuildConfiguration.RelativeEnginePath));

					KeyProcess.Start();
					KeyProcess.WaitForExit();

					// make sure it succeeded if we want to re-init
					if (KeyProcess.ExitCode == 0)
					{
						InitializeRemoteExecution();
					}
				}
			}
            else
			{
				RemoteServerName = Environment.MachineName;
				// can't error in this case
			}

			bHasBeenInitialized = true;
			return InitializationErrorCode;
        }

		public override void SetUpGlobalEnvironment()
		{
			base.SetUpGlobalEnvironment();

			// connect to server
			InitializeRemoteExecution();

			// Setup root directory to use.
			SetUserDevRootFromServer();
		}

        /** Converts the passed in path from UBT host to compiler native format. */
        public override String ConvertPath(String OriginalPath)
        {
            if (BuildHostPlatform.Current.Platform != UnrealTargetPlatform.Mac)
            {
				if (OriginalPath[1] != ':')
				{
					throw new BuildException("Can only convert full paths ({0})", OriginalPath);
				}

				string MacPath = string.Format("{0}{1}/{2}/{3}",
					UserDevRootMac,
					Environment.MachineName,
					OriginalPath[0].ToString().ToUpper(),
					OriginalPath.Substring(3));

				// clean the path
				MacPath = MacPath.Replace("\\", "/");

				return MacPath;
            }
            else
            {
				return OriginalPath.Replace("\\", "/");
            }
        }

		protected string GetMacDevSrcRoot()
		{
			if (BuildHostPlatform.Current.Platform != UnrealTargetPlatform.Mac)
			{
				// figure out the remote version of Engine/Source
				return ConvertPath(Path.GetFullPath(Path.Combine(BranchDirectory, "Engine/Source/")));
			}
			else
			{
				return ".";
			}
		}

		private static List<string> RsyncDirs = new List<string>();
		private static List<string> RsyncExtensions = new List<string>();

        public void QueueFileForBatchUpload(FileItem LocalFileItem)
        {
			// Now, we actually just remember unique directories with any files, and upload all files in them to the remote machine
			// (either via rsync, or RPCUtil acting like rsync)
			string Entry = Path.GetDirectoryName(LocalFileItem.AbsolutePath);
			if (!RsyncDirs.Contains(Entry))
			{
				RsyncDirs.Add(Entry);
			}

			string Ext = Path.GetExtension(LocalFileItem.AbsolutePath);
			if (Ext == "")
			{
				Ext = Path.GetFileName(LocalFileItem.AbsolutePath);
			}
			if (!RsyncExtensions.Contains(Ext))
            {
				RsyncExtensions.Add(Ext);
            }
        }

        public FileItem LocalToRemoteFileItem(FileItem LocalFileItem, bool bShouldUpload)
        {
            FileItem RemoteFileItem = null;

            // Look to see if we've already made a remote FileItem for this local FileItem
            if (!CachedRemoteFileItems.TryGetValue(LocalFileItem, out RemoteFileItem))
            {
                // If not, create it now
                string RemoteFilePath = ConvertPath(LocalFileItem.AbsolutePath);
				RemoteFileItem = FileItem.GetRemoteItemByPath(RemoteFilePath, RemoteToolChainPlatform);

                // Is shadowing requested?
                if (bShouldUpload)
                {
                    QueueFileForBatchUpload(LocalFileItem);
                }

                CachedRemoteFileItems.Add(LocalFileItem, RemoteFileItem);
            }

            return RemoteFileItem;
        }

        /**
		 * Helper function to sync source files to and from the local system and a remote Mac
		 */
        //This chunk looks to be required to pipe output to VS giving information on the status of a remote build.
        public static bool OutputReceivedDataEventHandlerEncounteredError = false;
        public static string OutputReceivedDataEventHandlerEncounteredErrorMessage = "";
        public static void OutputReceivedDataEventHandler(Object Sender, DataReceivedEventArgs Line)
        {
            if ((Line != null) && (Line.Data != null))
            {
                Log.TraceInformation(Line.Data);

                foreach (string ErrorToken in ErrorMessageTokens)
                {
                    if (Line.Data.Contains(ErrorToken))
                    {
                        OutputReceivedDataEventHandlerEncounteredError = true;
                        OutputReceivedDataEventHandlerEncounteredErrorMessage += Line.Data;
                        break;
                    }
                }
            }
        }

		public override void PostCodeGeneration(UHTManifest Manifest)
		{
			if (BuildHostPlatform.Current.Platform != UnrealTargetPlatform.Mac)
			{
				// @todo UHT: Temporary workaround for UBT no longer being able to follow includes from generated headers unless
				//  the headers already existed before the build started.  We're working on a proper fix.

				// Make sure all generated headers are synced.  If we had to generate code, we need to assume that not all of the
				// header files existed on disk at the time that UBT scanned include statements looking for prerequisite files.  Those
				// files are created during code generation and must exist on disk by the time this function is called.  We'll scan
				// for generated code files and make sure they are enqueued for copying to the remote machine.
				foreach( var UObjectModule in Manifest.Modules )
				{
					// @todo uht: Ideally would only copy exactly the files emitted by UnrealHeaderTool, rather than scanning directory (could copy stale files; not a big deal though)
					try
					{
						var GeneratedCodeDirectory = Path.GetDirectoryName( UObjectModule.GeneratedCPPFilenameBase );
						var GeneratedCodeFiles     = Directory.GetFiles( GeneratedCodeDirectory, "*", SearchOption.AllDirectories );
						foreach( var GeneratedCodeFile in GeneratedCodeFiles )
						{
							// Skip copying "Timestamp" files (UBT temporary files)
							if( !Path.GetFileName( GeneratedCodeFile ).Equals( @"Timestamp", StringComparison.InvariantCultureIgnoreCase ) )
							{
								var GeneratedCodeFileItem = FileItem.GetExistingItemByPath( GeneratedCodeFile );
								QueueFileForBatchUpload( GeneratedCodeFileItem );
							}
						}
					}
					catch (System.IO.DirectoryNotFoundException)
					{
						// Ignore directory not found
					}

					// For source files in legacy "Classes" directories, we need to make sure they all get copied over too, since
					// they may not have been directly included in any C++ source files (only generated headers), and the initial
					// header scan wouldn't have picked them up if they hadn't been generated yet!
					try
					{
						var SourceFiles = Directory.GetFiles( UObjectModule.BaseDirectory, "*", SearchOption.AllDirectories );
						foreach( var SourceFile in SourceFiles )
						{
							var SourceFileItem = FileItem.GetExistingItemByPath( SourceFile );
							QueueFileForBatchUpload( SourceFileItem );
						}
					}
					catch (System.IO.DirectoryNotFoundException)
					{
						// Ignore directory not found
					}
				}
			}
		}

		static public void OutputReceivedForRsync(Object Sender, DataReceivedEventArgs Line)
		{
			if ((Line != null) && (Line.Data != null) && (Line.Data != ""))
			{
				Log.TraceInformation(Line.Data);
			}
		}

		private static Dictionary<Object,StringBuilder> SSHOutputMap = new Dictionary<object,StringBuilder>();
		static public void OutputReceivedForSSH(Object Sender, DataReceivedEventArgs Line)
		{
			if ((Line != null) && (Line.Data != null) && (Line.Data != ""))
			{
				StringBuilder SSHOutput = SSHOutputMap[Sender];
				if (SSHOutput.Length != 0)
				{
					SSHOutput.Append(Environment.NewLine);
				}
				SSHOutput.Append(Line.Data);
			}
		}
		
		private static string ConvertPathToCygwin(string InPath)
		{
			if (InPath == null)
			{
				return null;
			}
			return "/cygdrive/" + Utils.CleanDirectorySeparators(InPath.Replace(":", ""), '/');
		}

		public override void PreBuildSync()
        {
			// no need to sync on the Mac!
			if (BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Mac)
			{
				return;
			}

			if (bUseRPCUtil)
			{
				string ExtString = "";

				// look only for useful extensions
				foreach (string Ext in RsyncExtensions)
				{
					// for later ls
					ExtString += Ext.StartsWith(".") ? ("*" + Ext) : Ext;
					ExtString += " ";
				}

				List<string> BatchUploadCommands = new List<string>();
				// for each directory we visited, add all the files in that directory
				foreach (string Dir in RsyncDirs)
				{
					List<string> LocalFilenames = new List<string>();

					// look only for useful extensions
					foreach (string Ext in RsyncExtensions)
					{
						string[] Files = Directory.GetFiles(Dir, "*" + Ext);
						foreach (string SyncFile in Files)
						{
							// remember all local files
							LocalFilenames.Add(Path.GetFileName(SyncFile));

							string RemoteFilePath = ConvertPath(SyncFile);
							// an upload command is local name and remote name
							BatchUploadCommands.Add(SyncFile + ";" + RemoteFilePath);
						}
					}
				}

				// batch upload
                RPCUtilHelper.BatchUpload(BatchUploadCommands.ToArray());
			}
			else
			{
				List<string> RelativeRsyncDirs = new List<string>();
				foreach (string Dir in RsyncDirs)
				{
					RelativeRsyncDirs.Add(Utils.CleanDirectorySeparators(Dir.Replace(":", ""), '/') + "/");
				}

				// write out directories to copy
				string RSyncPathsFile = Path.GetTempFileName();
				string IncludeFromFile = Path.GetTempFileName();
				File.WriteAllLines(RSyncPathsFile, RelativeRsyncDirs.ToArray());
				File.WriteAllLines(IncludeFromFile, RsyncExtensions);

				// source and destination paths in the format rsync wants
				string CygRootPath = "/cygdrive";// ConvertPathToCygwin(Path.GetFullPath(""));
				string RemotePath = string.Format("{0}{1}",
					UserDevRootMac,
					Environment.MachineName);

				// get the executable dir for SSH, so Rsync can call it easily
				string ExeDir = Path.GetDirectoryName(ResolvedSSHExe);
	
				Process RsyncProcess = new Process();
				if (ExeDir != "")
				{
					RsyncProcess.StartInfo.WorkingDirectory = ExeDir;
				}

				// --exclude='*'  ??? why???
				RsyncProcess.StartInfo.FileName = ResolvedRSyncExe;
				RsyncProcess.StartInfo.Arguments = string.Format(
					"-vzae \"{0}\" --rsync-path=\"mkdir -p {2} && rsync\" --chmod=ug=rwX,o=rxX --delete --files-from=\"{4}\" --include-from=\"{5}\" --include='*/' --exclude='*.o' --exclude='Timestamp' '{1}' {6}@{3}:'{2}'",
					ResolvedRsyncAuthentication,
					CygRootPath,
					RemotePath,
					RemoteServerName,
					ConvertPathToCygwin(RSyncPathsFile),
					ConvertPathToCygwin(IncludeFromFile),
					RSyncUsername);
				Console.WriteLine("Command: " + RsyncProcess.StartInfo.Arguments);

				RsyncProcess.OutputDataReceived += new DataReceivedEventHandler(OutputReceivedForRsync);
				RsyncProcess.ErrorDataReceived += new DataReceivedEventHandler(OutputReceivedForRsync);

				// run rsync
				Utils.RunLocalProcess(RsyncProcess);

				File.Delete(IncludeFromFile);
				File.Delete(RSyncPathsFile);
			}

			// we can now clear out the set of files
            RsyncDirs.Clear();
			RsyncExtensions.Clear();
		}

		static public bool UploadFile(string LocalPath, string RemotePath)
		{
			string RemoteDir = Path.GetDirectoryName(RemotePath).Replace("\\", "/");
			RemoteDir = RemoteDir.Replace(" ", "\\ ");
			string RemoteFilename = Path.GetFileName(RemotePath);

			// get the executable dir for SSH, so Rsync can call it easily
			string ExeDir = Path.GetDirectoryName(ResolvedSSHExe);

			Process RsyncProcess = new Process();
			if (ExeDir != "")
			{
				RsyncProcess.StartInfo.WorkingDirectory = ExeDir;
			}

			// make simple rsync commandline to send a file
			RsyncProcess.StartInfo.FileName = ResolvedRSyncExe;
			RsyncProcess.StartInfo.Arguments = string.Format(
				"-zae \"{0}\" --rsync-path=\"mkdir -p {1} && rsync\" '{2}' {3}@{4}:'{1}/{5}'",
				ResolvedRsyncAuthentication,
				RemoteDir,
				ConvertPathToCygwin(LocalPath),
				RSyncUsername,
				RemoteServerName,
				RemoteFilename
				);

			RsyncProcess.OutputDataReceived += new DataReceivedEventHandler(OutputReceivedForRsync);
			RsyncProcess.ErrorDataReceived += new DataReceivedEventHandler(OutputReceivedForRsync);

			// run rsync (0 means success)
			return Utils.RunLocalProcess(RsyncProcess) == 0;
		}

		static public bool DownloadFile(string RemotePath, string LocalPath)
		{
			// get the executable dir for SSH, so Rsync can call it easily
			string ExeDir = Path.GetDirectoryName(ResolvedSSHExe);
			string RemoteDir = RemotePath.Replace(" ", "\\ ");

			Process RsyncProcess = new Process();
			if (ExeDir != "")
			{
				RsyncProcess.StartInfo.WorkingDirectory = ExeDir;
			}

			// make sure directory exists to download to
			Directory.CreateDirectory(Path.GetDirectoryName(LocalPath));

			// make simple rsync commandline to send a file
			RsyncProcess.StartInfo.FileName = ResolvedRSyncExe;
			RsyncProcess.StartInfo.Arguments = string.Format(
				"-zae \"{0}\" {2}@{3}:'{4}' \"{1}\"",
				ResolvedRsyncAuthentication,
				ConvertPathToCygwin(LocalPath),
				RSyncUsername,
				RemoteServerName,
				RemoteDir
				);

			RsyncProcess.OutputDataReceived += new DataReceivedEventHandler(OutputReceivedForRsync);
			RsyncProcess.ErrorDataReceived += new DataReceivedEventHandler(OutputReceivedForRsync);

			//Console.WriteLine("COPY: {0} {1}", RsyncProcess.StartInfo.FileName, RsyncProcess.StartInfo.Arguments);

			// run rsync (0 means success)
			return Utils.RunLocalProcess(RsyncProcess) == 0;
		}

		static public Hashtable SSHCommand(string WorkingDirectory, string Command, string RemoteOutputPath)
		{
			Console.WriteLine("Doing {0}", Command);

			// make the commandline for other end
			string RemoteCommandline = "cd \"" + WorkingDirectory + "\"";
			if (!string.IsNullOrWhiteSpace(RemoteOutputPath))
			{
				RemoteCommandline += " && mkdir -p \"" + Path.GetDirectoryName(RemoteOutputPath).Replace("\\", "/") + "\"";
			}

			// get the executable dir for SSH
			string ExeDir = Path.GetDirectoryName(ResolvedSSHExe);

			Process SSHProcess = new Process();
			if (ExeDir != "")
			{
				SSHProcess.StartInfo.WorkingDirectory = ExeDir;
			}

			// long commands go as a file
			if (Command.Length > 1024)
			{
				// upload the commandline text file
				string CommandLineFile = Path.GetTempFileName();
				File.WriteAllText(CommandLineFile, Command);

				string RemoteCommandlineDir = "/var/tmp/" + Environment.MachineName;
				string RemoteCommandlinePath = RemoteCommandlineDir + "/" + Path.GetFileName(CommandLineFile);

				DateTime Now = DateTime.Now;
				UploadFile(CommandLineFile, RemoteCommandlinePath);
				Console.WriteLine("Upload took {0}", (DateTime.Now - Now).ToString());

				// execute the file, not a commandline
				RemoteCommandline += string.Format(" && bash < {0} && rm {0}", RemoteCommandlinePath);
			}
			else
			{
				RemoteCommandline += " && " + Command;
			}

			SSHProcess.StartInfo.FileName = ResolvedSSHExe;
			SSHProcess.StartInfo.Arguments = string.Format(
				"{0} {1}@{2} \"{3}\"",
				ResolvedSSHAuthentication,
				RSyncUsername,
				RemoteServerName,
				RemoteCommandline.Replace("\"", "\\\""));

			Hashtable Return = new Hashtable();

			// add this process to the map
			SSHOutputMap[SSHProcess] = new StringBuilder("");
			SSHProcess.OutputDataReceived += new DataReceivedEventHandler(OutputReceivedForSSH);
			SSHProcess.ErrorDataReceived += new DataReceivedEventHandler(OutputReceivedForSSH);

			DateTime Start = DateTime.Now;
			Int64 ExitCode = Utils.RunLocalProcess(SSHProcess);
			Console.WriteLine("Execute took {0}", (DateTime.Now - Start).ToString());

			// now we have enough to fill out the HashTable
			Return["CommandOutput"] = SSHOutputMap[SSHProcess].ToString();
			Return["ExitCode"] = (object)ExitCode;

			SSHOutputMap.Remove(SSHProcess);

			return Return;
		}

		public override void PostBuildSync(UEBuildTarget Target)
        {

        }

		static public Double GetAdjustedProcessorCountMultiplier()
		{
            if (BuildHostPlatform.Current.Platform != UnrealTargetPlatform.Mac)
            {
                Int32 RemoteCPUCount = RPCUtilHelper.GetCommandSlots();
                if (RemoteCPUCount == 0)
                {
                    RemoteCPUCount = Environment.ProcessorCount;
                }

                Double AdjustedMultiplier = (Double)RemoteCPUCount / (Double)Environment.ProcessorCount;
                Log.TraceVerbose("Adjusting the remote Mac compile process multiplier to " + AdjustedMultiplier.ToString());
                return AdjustedMultiplier;
            }
            else
            {
                return 1.0;
            }
		}

        static public Int32 GetAvailableCommandSlotCount(string TargetMacName)
        {
            // ask how many slots are available, and increase by 1 (not sure why)
            Int32 RemoteAvailableCommandSlotCount = 1 + QueryRemoteMachine(TargetMacName, "rpc:command_slots_available");

            Log.TraceVerbose("Available command slot count for " + TargetMacName + " is " + RemoteAvailableCommandSlotCount.ToString());
            return RemoteAvailableCommandSlotCount;
        }

		/**
		 * Translates clang output warning/error messages into vs-clickable messages
		 * 
		 * @param	sender		Sending object
		 * @param	e			Event arguments (In this case, the line of string output)
		 */
		protected void RemoteOutputReceivedEventHandler(object sender, DataReceivedEventArgs e)
		{
			var Output = e.Data;
			if (Output == null)
			{
				return;
			}

			if (Utils.IsRunningOnMono)
			{
				Log.TraceInformation(Output);
			}
			else
			{
				// Need to match following for clickable links
				string RegexFilePath = @"^(\/[A-Za-z0-9_\-\.]*)+\.(cpp|c|mm|m|hpp|h)";
				string RegexLineNumber = @"\:\d+\:\d+\:";
				string RegexDescription = @"(\serror:\s|\swarning:\s).*";

				// Get Matches
				string MatchFilePath = Regex.Match(Output, RegexFilePath).Value.Replace("Engine/Source/../../", "");
				string MatchLineNumber = Regex.Match(Output, RegexLineNumber).Value;
				string MatchDescription = Regex.Match(Output, RegexDescription).Value;

				// If any of the above matches failed, do nothing
				if (MatchFilePath.Length == 0 ||
					MatchLineNumber.Length == 0 ||
					MatchDescription.Length == 0)
				{
					Log.TraceInformation(Output);
					return;
				}

				// Convert Path
				string RegexStrippedPath = @"\/Engine\/.*"; //@"(Engine\/|[A-Za-z0-9_\-\.]*\/).*";
				string ConvertedFilePath = Regex.Match(MatchFilePath, RegexStrippedPath).Value;
				ConvertedFilePath = Path.GetFullPath("..\\.." + ConvertedFilePath);

				// Extract Line + Column Number
				string ConvertedLineNumber = Regex.Match(MatchLineNumber, @"\d+").Value;
				string ConvertedColumnNumber = Regex.Match(MatchLineNumber, @"(?<=:\d+:)\d+").Value;

				// Write output
				string ConvertedExpression = "  " + ConvertedFilePath + "(" + ConvertedLineNumber + "," + ConvertedColumnNumber + "):" + MatchDescription;
				Log.TraceInformation(ConvertedExpression); // To create clickable vs link
	//			Log.TraceInformation(Output);				// To preserve readable output log
			}
		}
		
		/**
		 * Queries the remote compile server for CPU information
		 * and computes the proper ProcessorCountMultiplier.
		 */
        static private Int32 QueryResult = 0;
        static public void OutputReceivedForQuery(Object Sender, DataReceivedEventArgs Line)
        {
            if ((Line != null) && (Line.Data != null) && (Line.Data != ""))
            {
                Int32 TestValue = 0;
                if (Int32.TryParse(Line.Data, out TestValue))
                {
                    QueryResult = TestValue;
                }
                else
                {
                  Log.TraceVerbose("Info: Unexpected output from remote Mac system info query, skipping");                  
                }
            }
        }

        static public Int32 QueryRemoteMachine(string MachineName, string Command)
        {
            // we must run the commandline RPCUtility, because we could run this before we have opened up the RemoteRPCUtlity
            Process QueryProcess = new Process();
            QueryProcess.StartInfo.WorkingDirectory = Path.GetFullPath("..\\Binaries\\DotNET");
            QueryProcess.StartInfo.FileName = QueryProcess.StartInfo.WorkingDirectory + "\\RPCUtility.exe";
            QueryProcess.StartInfo.Arguments = string.Format("{0} {1} sysctl -n hw.ncpu",
                MachineName,
                UserDevRootMac);
            QueryProcess.OutputDataReceived += new DataReceivedEventHandler(OutputReceivedForQuery);
            QueryProcess.ErrorDataReceived += new DataReceivedEventHandler(OutputReceivedForQuery);

            // Try to launch the query's process, and produce a friendly error message if it fails.
            Utils.RunLocalProcess(QueryProcess);

            return QueryResult;
        }
	};
}