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

#include "TargetPlatformPrivatePCH.h"
#include "PlatformInfo.h"
#include "DesktopPlatformModule.h"
#include "IPhysXFormatModule.h"
#include "IPhysXFormat.h"


DEFINE_LOG_CATEGORY_STATIC(LogTargetPlatformManager, Log, All);


// autosdks only function properly on windows right now.
#if !IS_MONOLITHIC && (PLATFORM_WINDOWS)
	#define AUTOSDKS_ENABLED 1
#else
	#define AUTOSDKS_ENABLED 0
#endif


/**
 * Module for the target platform manager
 */
class FTargetPlatformManagerModule
	: public ITargetPlatformManagerModule
{
public:

	/** Default constructor. */
	FTargetPlatformManagerModule()
		: bRestrictFormatsToRuntimeOnly(false), bForceCacheUpdate(true)
	{
#if AUTOSDKS_ENABLED		
		
		// AutoSDKs only enabled if UE_SDKS_ROOT is set.
		if (IsAutoSDKsEnabled())
		{					
			// amortize UBT cost by calling it once for all platforms, rather than once per platform.
			FString UBTParams(TEXT("-autosdkonly"));
			int32 UBTReturnCode = -1;
			FString UBTOutput;
			if (!FDesktopPlatformModule::Get()->InvokeUnrealBuildToolSync(UBTParams, *GLog, true, UBTReturnCode, UBTOutput))
			{
				UE_LOG(LogTargetPlatformManager, Fatal, TEXT("Failed to run UBT to check SDK status!"));
			}

			// we have to setup our local environment according to AutoSDKs or the ITargetPlatform's IsSDkInstalled calls may fail
			// before we get a change to setup for a given platform.  Use the platforminfo list to avoid any kind of interdependency.
			int32 NumPlatforms;
			const PlatformInfo::FPlatformInfo* PlatformInfoArray = PlatformInfo::GetPlatformInfoArray(NumPlatforms);
			for (int32 i = 0; i < NumPlatforms; ++i)
			{
				const PlatformInfo::FPlatformInfo& PlatformInfo = PlatformInfoArray[i];
				if (PlatformInfo.AutoSDKPath.Len() > 0)
				{
					SetupAndValidateAutoSDK(PlatformInfo.AutoSDKPath);
				}
			}
		}
#endif

		SetupSDKStatus();
		GetTargetPlatforms();
		GetActiveTargetPlatforms();
		GetAudioFormats();
		GetTextureFormats();
		GetShaderFormats();

		bForceCacheUpdate = false;

		FModuleManager::Get().OnModulesChanged().AddRaw(this, &FTargetPlatformManagerModule::ModulesChangesCallback);
	}

	/** Destructor. */
	virtual ~FTargetPlatformManagerModule()
	{
		FModuleManager::Get().OnModulesChanged().RemoveAll(this);
	}

public:

	// ITargetPlatformManagerModule interface

	virtual void Invalidate()
	{
		bForceCacheUpdate = true;

		SetupSDKStatus();
		GetTargetPlatforms();
		GetActiveTargetPlatforms();
		GetAudioFormats();
		GetTextureFormats();
		GetShaderFormats();

		bForceCacheUpdate = false;
	}

	virtual const TArray<ITargetPlatform*>& GetTargetPlatforms() override
	{
		if (Platforms.Num() == 0 || bForceCacheUpdate)
		{
			DiscoverAvailablePlatforms();
		}

		return Platforms;
	}

	virtual ITargetDevicePtr FindTargetDevice(const FTargetDeviceId& DeviceId) override
	{
		ITargetPlatform* Platform = FindTargetPlatform(DeviceId.GetPlatformName());

		if (Platform != nullptr)
		{
			return Platform->GetDevice(DeviceId);
		}

		return nullptr;
	}

	virtual ITargetPlatform* FindTargetPlatform(FString Name) override
	{
		const TArray<ITargetPlatform*>& TargetPlatforms = GetTargetPlatforms();	
		
		for (int32 Index = 0; Index < TargetPlatforms.Num(); Index++)
		{
			if (TargetPlatforms[Index]->PlatformName() == Name)
			{
				return TargetPlatforms[Index];
			}
		}

		return nullptr;
	}

	virtual const TArray<ITargetPlatform*>& GetCookingTargetPlatforms() override
	{
		static bool bInitialized = false;
		static TArray<ITargetPlatform*> Results;

		if ( !bInitialized || bForceCacheUpdate )
		{
			Results = GetActiveTargetPlatforms();

			FString PlatformStr;
			if (FParse::Value(FCommandLine::Get(), TEXT("TARGETPLATFORM="), PlatformStr))
			{
				if (PlatformStr == TEXT("None"))
				{
					Results = Platforms;
				}
			}
			else
			{
				Results = Platforms;
			}
		}

		return Results;
	}

	virtual const TArray<ITargetPlatform*>& GetActiveTargetPlatforms() override
	{
		static bool bInitialized = false;
		static TArray<ITargetPlatform*> Results;

		if (!bInitialized || bForceCacheUpdate)
		{
			bInitialized = true;

			Results.Empty(Results.Num());

			const TArray<ITargetPlatform*>& TargetPlatforms = GetTargetPlatforms();	

			FString PlatformStr;

			if (FParse::Value(FCommandLine::Get(), TEXT("TARGETPLATFORM="), PlatformStr))
			{
				if (PlatformStr == TEXT("None"))
				{
				}
				else if (PlatformStr == TEXT("All"))
				{
					Results = TargetPlatforms;
				}
				else
				{
					TArray<FString> PlatformNames;

					PlatformStr.ParseIntoArray(&PlatformNames, TEXT("+"), true);

					// for nicer user response
					FString AvailablePlatforms;

					for (int32 Index = 0; Index < TargetPlatforms.Num(); Index++)
					{
						if (PlatformNames.Contains(TargetPlatforms[Index]->PlatformName()))
						{							
							Results.Add(TargetPlatforms[Index]);						
						}

						if(!AvailablePlatforms.IsEmpty())
						{
							AvailablePlatforms += TEXT(", ");
						}
						AvailablePlatforms += TargetPlatforms[Index]->PlatformName();
					}

					if (Results.Num() == 0)
					{
						// An invalid platform was specified...
						// Inform the user and exit.
						UE_LOG(LogTargetPlatformManager, Fatal, TEXT("Invalid target platform specified (%s). Available = { %s } "), *PlatformStr, *AvailablePlatforms);
					}
				}
			}
			else
			{
				// if there is no argument, use the current platform and only build formats that are actually needed to run.
				bRestrictFormatsToRuntimeOnly = true;

				for (int32 Index = 0; Index < TargetPlatforms.Num(); Index++)
				{
					if (TargetPlatforms[Index]->IsRunningPlatform())
					{						
						Results.Add(TargetPlatforms[Index]);					
					}
				}
			}

			if (!Results.Num())
			{
				UE_LOG(LogTargetPlatformManager, Display, TEXT("Not building assets for any platform."));
			}
			else
			{
				for (int32 Index = 0; Index < Results.Num(); Index++)
				{
					UE_LOG(LogTargetPlatformManager, Display, TEXT("Building Assets For %s"), *Results[Index]->PlatformName());
				}
			}
		}

		return Results;
	}

	virtual bool RestrictFormatsToRuntimeOnly() override
	{
		GetActiveTargetPlatforms(); // make sure this is initialized

		return bRestrictFormatsToRuntimeOnly;
	}

	virtual ITargetPlatform* GetRunningTargetPlatform() override
	{
		static bool bInitialized = false;
		static ITargetPlatform* Result = nullptr;

		if (!bInitialized || bForceCacheUpdate)
		{
			bInitialized = true;
			Result = nullptr;

			const TArray<ITargetPlatform*>& TargetPlatforms = GetTargetPlatforms();	

			for (int32 Index = 0; Index < TargetPlatforms.Num(); Index++)
			{
				if (TargetPlatforms[Index]->IsRunningPlatform())
				{
					 // we should not have two running platforms
					checkf((Result == nullptr),
						TEXT("Found multiple running platforms.\n\t%s\nand\n\t%s"),
						*Result->PlatformName(),
						*TargetPlatforms[Index]->PlatformName()
						);
					Result = TargetPlatforms[Index];
				}
			}
		}

		return Result;
	}

	virtual const TArray<const IAudioFormat*>& GetAudioFormats() override
	{
		static bool bInitialized = false;
		static TArray<const IAudioFormat*> Results;

		if (!bInitialized || bForceCacheUpdate)
		{
			bInitialized = true;
			Results.Empty(Results.Num());

			TArray<FName> Modules;

			FModuleManager::Get().FindModules(TEXT("*AudioFormat*"), Modules);

			if (!Modules.Num())
			{
				UE_LOG(LogTargetPlatformManager, Error, TEXT("No target audio formats found!"));
			}

			for (int32 Index = 0; Index < Modules.Num(); Index++)
			{
				IAudioFormatModule* Module = FModuleManager::LoadModulePtr<IAudioFormatModule>(Modules[Index]);
				if (Module)
				{
					IAudioFormat* Format = Module->GetAudioFormat();
					if (Format != nullptr)
					{
						Results.Add(Format);
					}
				}
			}
		}

		return Results;
	}

	virtual const IAudioFormat* FindAudioFormat(FName Name) override
	{
		const TArray<const IAudioFormat*>& AudioFormats = GetAudioFormats();

		for (int32 Index = 0; Index < AudioFormats.Num(); Index++)
		{
			TArray<FName> Formats;

			AudioFormats[Index]->GetSupportedFormats(Formats);

			for (int32 FormatIndex = 0; FormatIndex < Formats.Num(); FormatIndex++)
			{
				if (Formats[FormatIndex] == Name)
				{
					return AudioFormats[Index];
				}
			}
		}

		return nullptr;
	}

	virtual const TArray<const ITextureFormat*>& GetTextureFormats() override
	{
		static bool bInitialized = false;
		static TArray<const ITextureFormat*> Results;

		if (!bInitialized || bForceCacheUpdate)
		{
			bInitialized = true;
			Results.Empty(Results.Num());

			TArray<FName> Modules;

			FModuleManager::Get().FindModules(TEXT("*TextureFormat*"), Modules);

			if (!Modules.Num())
			{
				UE_LOG(LogTargetPlatformManager, Error, TEXT("No target texture formats found!"));
			}

			for (int32 Index = 0; Index < Modules.Num(); Index++)
			{
				ITextureFormatModule* Module = FModuleManager::LoadModulePtr<ITextureFormatModule>(Modules[Index]);
				if (Module)
				{
					ITextureFormat* Format = Module->GetTextureFormat();
					if (Format != nullptr)
					{
						Results.Add(Format);
					}
				}
			}
		}

		return Results;
	}

	virtual const ITextureFormat* FindTextureFormat(FName Name) override
	{
		const TArray<const ITextureFormat*>& TextureFormats = GetTextureFormats();

		for (int32 Index = 0; Index < TextureFormats.Num(); Index++)
		{
			TArray<FName> Formats;

			TextureFormats[Index]->GetSupportedFormats(Formats);

			for (int32 FormatIndex = 0; FormatIndex < Formats.Num(); FormatIndex++)
			{
				if (Formats[FormatIndex] == Name)
				{
					return TextureFormats[Index];
				}
			}
		}

		return nullptr;
	}

	virtual const TArray<const IShaderFormat*>& GetShaderFormats() override
	{
		static bool bInitialized = false;
		static TArray<const IShaderFormat*> Results;

		if (!bInitialized || bForceCacheUpdate)
		{
			bInitialized = true;
			Results.Empty(Results.Num());

			TArray<FName> Modules;

			FModuleManager::Get().FindModules(SHADERFORMAT_MODULE_WILDCARD, Modules);

			if (!Modules.Num())
			{
				UE_LOG(LogTargetPlatformManager, Error, TEXT("No target shader formats found!"));
			}

			for (int32 Index = 0; Index < Modules.Num(); Index++)
			{
				IShaderFormatModule* Module = FModuleManager::LoadModulePtr<IShaderFormatModule>(Modules[Index]);
				if (Module)
				{
					IShaderFormat* Format = Module->GetShaderFormat();
					if (Format != nullptr)
					{
						Results.Add(Format);
					}
				}
			}
		}
		return Results;
	}

	virtual const IShaderFormat* FindShaderFormat(FName Name) override
	{
		const TArray<const IShaderFormat*>& ShaderFormats = GetShaderFormats();	

		for (int32 Index = 0; Index < ShaderFormats.Num(); Index++)
		{
			TArray<FName> Formats;
			
			ShaderFormats[Index]->GetSupportedFormats(Formats);
		
			for (int32 FormatIndex = 0; FormatIndex < Formats.Num(); FormatIndex++)
			{
				if (Formats[FormatIndex] == Name)
				{
					return ShaderFormats[Index];
				}
			}
		}

		return nullptr;
	}

	virtual uint16 ShaderFormatVersion(FName Name) override
	{
		static TMap<FName, uint16> AlreadyFound;
		uint16* Result = AlreadyFound.Find(Name);

		if (!Result)
		{
			const IShaderFormat* SF = FindShaderFormat(Name);

			if (SF)
			{
				Result = &AlreadyFound.Add(Name, SF->GetVersion(Name));
			}
		}

		check(Result);

		return *Result;
	}

	virtual const TArray<const IPhysXFormat*>& GetPhysXFormats() override
	{
		static bool bInitialized = false;
		static TArray<const IPhysXFormat*> Results;

		if (!bInitialized || bForceCacheUpdate)
		{
			bInitialized = true;
			Results.Empty(Results.Num());
			
			TArray<FName> Modules;
			FModuleManager::Get().FindModules(TEXT("PhysXFormat*"), Modules);
			
			if (!Modules.Num())
			{
				UE_LOG(LogTargetPlatformManager, Error, TEXT("No target PhysX formats found!"));
			}

			for (int32 Index = 0; Index < Modules.Num(); Index++)
			{
				IPhysXFormatModule* Module = FModuleManager::LoadModulePtr<IPhysXFormatModule>(Modules[Index]);
				if (Module)
				{
					IPhysXFormat* Format = Module->GetPhysXFormat();
					if (Format != nullptr)
					{
						Results.Add(Format);
					}
				}
			}
		}

		return Results;
	}

	virtual const IPhysXFormat* FindPhysXFormat(FName Name) override
	{
		const TArray<const IPhysXFormat*>& PhysXFormats = GetPhysXFormats();

		for (int32 Index = 0; Index < PhysXFormats.Num(); Index++)
		{
			TArray<FName> Formats;

			PhysXFormats[Index]->GetSupportedFormats(Formats);
		
			for (int32 FormatIndex = 0; FormatIndex < Formats.Num(); FormatIndex++)
			{
				if (Formats[FormatIndex] == Name)
				{
					return PhysXFormats[Index];
				}
			}
		}

		return nullptr;
	}

protected:

	/**
	 * Checks whether the AutoDesk software development kit (SDK) is enabled.
	 *
	 * @return true if the SDK is enabled, false otherwise.
	 */
	bool IsAutoSDKsEnabled()
	{
		static const FString SDKRootEnvFar(TEXT("UE_SDKS_ROOT"));
		const int32 MaxPathSize = 16384;
		TCHAR SDKPath[MaxPathSize] = { 0 };
		FPlatformMisc::GetEnvironmentVariable(*SDKRootEnvFar, SDKPath, MaxPathSize);

		// AutoSDKs only enabled if UE_SDKS_ROOT is set.
		if (SDKPath[0] != 0)
		{
			return true;
		}
		return false;
	}

	/** Discovers the available target platforms. */
	void DiscoverAvailablePlatforms()
	{
		Platforms.Empty(Platforms.Num());

		TArray<FName> Modules;

		FModuleManager::Get().FindModules(TEXT("*TargetPlatform"), Modules);

		// remove this module from the list
		Modules.Remove(FName(TEXT("TargetPlatform")));

		if (!Modules.Num())
		{
			UE_LOG(LogTargetPlatformManager, Error, TEXT("No target platforms found!"));
		}

		FScopedSlowTask SlowTask(Modules.Num());
		for (int32 Index = 0; Index < Modules.Num(); Index++)
		{
			SlowTask.EnterProgressFrame(1);
			ITargetPlatformModule* Module = FModuleManager::LoadModulePtr<ITargetPlatformModule>(Modules[Index]);
			if (Module)
			{
				ITargetPlatform* Platform = Module->GetTargetPlatform();
				if (Platform != nullptr)
				{
					// would like to move this check to GetActiveTargetPlatforms, but too many things cache this result
					// this setup will become faster after TTP 341897 is complete.					
					if (SetupAndValidateAutoSDK(Platform->GetPlatformInfo().AutoSDKPath))
					{
						Platforms.Add(Platform);
					}
				}
			}
		}
	}

	bool UpdatePlatformEnvironment(FString PlatformName, TArray<FString> &Keys, TArray<FString> &Values)
	{
		SetupEnvironmentVariables(Keys, Values);
		return SetupSDKStatus(PlatformName);	
	}

	bool SetupAndValidateAutoSDK(const FString& AutoSDKPath)
	{
#if AUTOSDKS_ENABLED
		bool bValidSDK = false;
		if (AutoSDKPath.Len() > 0)
		{		
			FName PlatformFName(*AutoSDKPath);

			// cache result of the last setup attempt to avoid calling UBT all the time.
			bool* bPreviousSetupSuccessful = PlatformsSetup.Find(PlatformFName);
			if (bPreviousSetupSuccessful)
			{
				bValidSDK = *bPreviousSetupSuccessful;
			}
			else
			{
				bValidSDK = SetupEnvironmentFromAutoSDK(AutoSDKPath);
				PlatformsSetup.Add(PlatformFName, bValidSDK);
			}
		}
		else
		{
			// if a platform has no AutoSDKPath, then just assume the SDK is installed, we have no basis for determining it.
			bValidSDK = true;
		}
		return bValidSDK;
#else
		return true;
#endif // AUTOSDKS_ENABLED
	}
	
	bool SetupEnvironmentFromAutoSDK(const FString& AutoSDKPath)
	{						
#if AUTOSDKS_ENABLED
		
		if (!IsAutoSDKsEnabled())
		{
			return true;
		}

		// Invoke UBT to perform SDK switching, or detect that a proper manual SDK is already setup.				
#if PLATFORM_WINDOWS
		FString HostPlatform(TEXT("HostWin64"));
#else
#error Fill in your host platform directory
#endif		

		static const FString SDKRootEnvFar(TEXT("UE_SDKS_ROOT"));
		const int32 MaxPathSize = 16384;
		TCHAR SDKPath[MaxPathSize] = { 0 };
		FPlatformMisc::GetEnvironmentVariable(*SDKRootEnvFar, SDKPath, MaxPathSize);

		FString TargetSDKRoot = FPaths::Combine(SDKPath, *HostPlatform, *AutoSDKPath);
		static const FString SDKInstallManifestFileName(TEXT("CurrentlyInstalled.txt"));
		FString SDKInstallManifestFilePath = FPaths::Combine(*TargetSDKRoot, *SDKInstallManifestFileName);

		// If we are using a manual install, then it is valid for there to be no OutputEnvVars file.
		TAutoPtr<FArchive> InstallManifestFile(IFileManager::Get().CreateFileReader(*SDKInstallManifestFilePath));
		if (InstallManifestFile.IsValid())
		{
			TArray<FString> FileLines;
			int64 FileSize = InstallManifestFile->TotalSize();
			int64 MemSize = FileSize + 1;
			void* FileMem = FMemory::Malloc(MemSize);
			FMemory::Memset(FileMem, 0, MemSize);

			InstallManifestFile->Serialize(FileMem, FileSize);

			FString FileAsString(ANSI_TO_TCHAR(FileMem));
			FileAsString.ParseIntoArrayLines(&FileLines);

			FMemory::Free(FileMem);
			InstallManifestFile->Close();

			
			if (FileLines.Num() != 2)
			{
				UE_LOG(LogTargetPlatformManager, Warning, TEXT("Malformed install manifest file for Platform %s"), *AutoSDKPath);
				return false;
			}

			static const FString ManualSDKString(TEXT("ManualSDK"));
			if (FileLines[1].Compare(ManualSDKString, ESearchCase::IgnoreCase) == 0)
			{
				UE_LOG(LogTargetPlatformManager, Verbose, TEXT("Platform %s has manual sdk install"), *AutoSDKPath);				
				return true;
			}
		}
		else
		{	
			UE_LOG(LogTargetPlatformManager, Warning, TEXT("install manifest file for Platform %s not found.  Platform not set up."), *AutoSDKPath);			
			return false;			
		}		

		static const FString SDKEnvironmentVarsFile(TEXT("OutputEnvVars.txt"));
		FString EnvVarFileName = FPaths::Combine(*TargetSDKRoot, *SDKEnvironmentVarsFile);		

		// If we are using a manual install, then it is valid for there to be no OutputEnvVars file.
		TAutoPtr<FArchive> EnvVarFile(IFileManager::Get().CreateFileReader(*EnvVarFileName));
		if (EnvVarFile.IsValid())
		{
			TArray<FString> FileLines;
			{
				int64 FileSize = EnvVarFile->TotalSize();
				int64 MemSize = FileSize + 1;
				void* FileMem = FMemory::Malloc(MemSize);
				FMemory::Memset(FileMem, 0, MemSize);

				EnvVarFile->Serialize(FileMem, FileSize);

				FString FileAsString(ANSI_TO_TCHAR(FileMem));
				FileAsString.ParseIntoArrayLines(&FileLines);

				FMemory::Free(FileMem);
				EnvVarFile->Close();				
			}			

			TArray<FString> PathAdds;
			TArray<FString> PathRemoves;
			TArray<FString> EnvVarNames;
			TArray<FString> EnvVarValues;

			const FString VariableSplit(TEXT("="));
			for (int32 i = 0; i < FileLines.Num(); ++i)
			{				
				const FString& VariableString = FileLines[i];

				FString Left;
				FString Right;
				VariableString.Split(VariableSplit, &Left, &Right);
				
				if (Left.Compare(TEXT("strippath"), ESearchCase::IgnoreCase) == 0)
				{
					PathRemoves.Add(Right);
				}
				else if (Left.Compare(TEXT("addpath"), ESearchCase::IgnoreCase) == 0)
				{
					PathAdds.Add(Right);
				}
				else
				{
					// convenience for setup.bat writers.  Trim any accidental whitespace from var names/values.
					EnvVarNames.Add(Left.Trim().TrimTrailing());
					EnvVarValues.Add(Right.Trim().TrimTrailing());
				}
			}

			// don't actually set anything until we successfully validate and read all values in.
			// we don't want to set a few vars, return a failure, and then have a platform try to
			// build against a manually installed SDK with half-set env vars.
			SetupEnvironmentVariables(EnvVarNames, EnvVarValues);


			const int32 MaxPathVarLen = 32768;
			TCHAR OrigPathVarMem[MaxPathVarLen];
			FPlatformMisc::GetEnvironmentVariable(TEXT("PATH"), OrigPathVarMem, MaxPathVarLen);

			// actually perform the PATH stripping / adding.
			FString OrigPathVar(OrigPathVarMem);

			const TCHAR* PathDelimiter = FPlatformMisc::GetPathVarDelimiter();
			TArray<FString> PathVars;
			OrigPathVar.ParseIntoArray(&PathVars, PathDelimiter, true);

			TArray<FString> ModifiedPathVars;
			ModifiedPathVars = PathVars;

			// perform removes first, in case they overlap with any adds.
			for (int32 PathRemoveIndex = 0; PathRemoveIndex < PathRemoves.Num(); ++PathRemoveIndex)
			{
				const FString& PathRemove = PathRemoves[PathRemoveIndex];
				for (int32 PathVarIndex = 0; PathVarIndex < PathVars.Num(); ++PathVarIndex)
				{
					const FString& PathVar = PathVars[PathVarIndex];
					if (PathVar.Find(PathRemove, ESearchCase::IgnoreCase) >= 0)
					{
						UE_LOG(LogTargetPlatformManager, Verbose, TEXT("Removing Path: '%s'"), *PathVar);
						ModifiedPathVars.Remove(PathVar);
					}
				}
			}

			// remove all the of ADDs so that if this function is executed multiple times, the paths will be guarateed to be in the same order after each run.
			// If we did not do this, a 'remove' that matched some, but not all, of our 'adds' would cause the order to change.
			for (int32 PathAddIndex = 0; PathAddIndex < PathAdds.Num(); ++PathAddIndex)			
			{
				const FString& PathAdd = PathAdds[PathAddIndex];				
				for (int32 PathVarIndex = 0; PathVarIndex < PathVars.Num(); ++PathVarIndex)
				{
					const FString& PathVar = PathVars[PathVarIndex];
					if (PathVar.Find(PathAdd, ESearchCase::IgnoreCase) >= 0)
					{
						UE_LOG(LogTargetPlatformManager, Verbose, TEXT("Removing Path: '%s'"), *PathVar);
						ModifiedPathVars.Remove(PathVar);
					}
				}
			}

			// perform adds, but don't add duplicates
			for (int32 PathAddIndex = 0; PathAddIndex < PathAdds.Num(); ++PathAddIndex)
			{
				const FString& PathAdd = PathAdds[PathAddIndex];
				if (!ModifiedPathVars.Contains(PathAdd))
				{
					UE_LOG(LogTargetPlatformManager, Verbose, TEXT("Adding Path: '%s'"), *PathAdd);					
					ModifiedPathVars.Add(PathAdd);
				}
			}

			FString ModifiedPath = FString::Join(ModifiedPathVars, PathDelimiter);
			FPlatformMisc::SetEnvironmentVar(TEXT("PATH"), *ModifiedPath);			
		}
		else
		{
			UE_LOG(LogTargetPlatformManager, Warning, TEXT("OutputEnvVars.txt not found for platform: '%s'"), *AutoSDKPath);			
			return false;
		}

		UE_LOG(LogTargetPlatformManager, Verbose, TEXT("Platform %s has auto sdk install"), *AutoSDKPath);		
		return true;
#else
		return true;
#endif
	}

	bool SetupSDKStatus()
	{
		return SetupSDKStatus(TEXT(""));
	}

	bool SetupSDKStatus(FString TargetPlatforms)
	{
		// run UBT with -validate -allplatforms and read the output
#if PLATFORM_MAC
		FString CmdExe = TEXT("/bin/sh");
        FString ScriptPath = FPaths::ConvertRelativePathToFull(FPaths::EngineDir() / TEXT("Build/BatchFiles/Mac/RunMono.sh"));
		FString CommandLine = TEXT("\"") + ScriptPath + TEXT("\" \"") + FPaths::ConvertRelativePathToFull(FPaths::EngineDir() / TEXT("Binaries/DotNet/UnrealBuildTool.exe")) + TEXT("\" -validateplatform");
#else
		FString CmdExe = FPaths::ConvertRelativePathToFull(FPaths::EngineDir() / TEXT("Binaries/DotNet/UnrealBuildTool.exe"));
		FString CommandLine = TEXT("-validateplatform");
#endif

		// Allow for only a subset of platforms to be reparsed - needed when kicking a change from the UI
		CommandLine += TargetPlatforms.IsEmpty() ? TEXT(" -allplatforms") : (TEXT(" -platforms=") + TargetPlatforms);

		TSharedPtr<FMonitoredProcess> UBTProcess = MakeShareable(new FMonitoredProcess(CmdExe, CommandLine, true));
		UBTProcess->OnOutput().BindStatic(&FTargetPlatformManagerModule::OnStatusOutput);
		SDKStatusMessage = TEXT("");
		UBTProcess->Launch();
		while(UBTProcess->IsRunning())
		{
			FPlatformProcess::Sleep(0.01f);
		}

		TArray<FString> PlatArray;
		SDKStatusMessage.ParseIntoArrayWS(&PlatArray);
		for (int Index = 0; Index < PlatArray.Num()-2; ++Index)
		{
            FString Item = PlatArray[Index];
			if (PlatArray[Index].Contains(TEXT("##PlatformValidate:")))
			{
				PlatformInfo::EPlatformSDKStatus Status = PlatArray[Index+2].Contains(TEXT("INVALID")) ? PlatformInfo::EPlatformSDKStatus::NotInstalled : PlatformInfo::EPlatformSDKStatus::Installed;
				FString PlatformName = PlatArray[Index+1];
				if (PlatformName == TEXT("Win32") || PlatformName == TEXT("Win64"))
				{
					PlatformName = TEXT("Windows");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("WindowsNoEditor");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("WindowsClient");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("WindowsServer");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
				}
				else if (PlatformName == TEXT("Mac"))
				{
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("MacNoEditor");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("MacClient");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("MacServer");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
				}
				else if (PlatformName == TEXT("Linux"))
				{
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("LinuxNoEditor");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("LinuxClient");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
					PlatformName = TEXT("LinuxServer");
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
				}
				else
				{
					PlatformInfo::UpdatePlatformSDKStatus(PlatformName, Status);
				}
			}
		}
		return true;
	}

private:

	void SetupEnvironmentVariables(TArray<FString> &EnvVarNames, TArray<FString> EnvVarValues)
	{
		for (int i = 0; i < EnvVarNames.Num(); ++i)
		{
			const FString& EnvVarName = EnvVarNames[i];
			const FString& EnvVarValue = EnvVarValues[i];
			UE_LOG(LogTargetPlatformManager, Verbose, TEXT("Setting variable '%s' to '%s'."), *EnvVarName, *EnvVarValue);
			FPlatformMisc::SetEnvironmentVar(*EnvVarName, *EnvVarValue);
		}
	}

	void ModulesChangesCallback(FName ModuleName, EModuleChangeReason ReasonForChange)
	{
		if (ModuleName.ToString().Contains(TEXT("TargetPlatform")) )
		{
			Invalidate();
		}
	}
	
	static FString SDKStatusMessage;
	static void OnStatusOutput(FString Message)
	{
		SDKStatusMessage += Message;
	}

	// If true we should build formats that are actually required for use by the runtime. 
	// This happens for an ordinary editor run and more specifically whenever there is no
	// TargetPlatform= on the command line.
	bool bRestrictFormatsToRuntimeOnly;

	// Flag to force reinitialization of all cached data. This is needed to have up-to-date caches
	// in case of a module reload of a TargetPlatform-Module.
	bool bForceCacheUpdate;

	// Holds the list of discovered platforms.
	TArray<ITargetPlatform*> Platforms;

#if AUTOSDKS_ENABLED
	// holds the list of Platforms that have attempted setup.
	TMap<FName, bool> PlatformsSetup;
#endif
};


FString FTargetPlatformManagerModule::SDKStatusMessage = TEXT("");


IMPLEMENT_MODULE(FTargetPlatformManagerModule, TargetPlatform);