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

#include "ProjectsPrivatePCH.h"
#include "ProjectDescriptor.h"

#define LOCTEXT_NAMESPACE "ProjectDescriptor"

FProjectDescriptor::FProjectDescriptor()
{
	FileVersion = EProjectDescriptorVersion::Latest;
	EpicSampleNameHash = 0;
}

void FProjectDescriptor::Sign(const FString& FilePath)
{
	EpicSampleNameHash = GetTypeHash(FPaths::GetCleanFilename(FilePath));
}

bool FProjectDescriptor::IsSigned(const FString& FilePath) const
{
	return EpicSampleNameHash == GetTypeHash(FPaths::GetCleanFilename(FilePath));
}

void FProjectDescriptor::UpdateSupportedTargetPlatforms(const FName& InPlatformName, bool bIsSupported)
{
	if ( bIsSupported )
	{
		TargetPlatforms.AddUnique(InPlatformName);
	}
	else
	{
		TargetPlatforms.Remove(InPlatformName);
	}
}

bool FProjectDescriptor::Load(const FString& FileName, FText& OutFailReason)
{
	// Read the file to a string
	FString FileContents;
	if (!FFileHelper::LoadFileToString(FileContents, *FileName))
	{
		OutFailReason = FText::Format(LOCTEXT("FailedToLoadDescriptorFile", "Failed to open descriptor file '{0}'"), FText::FromString(FileName));
		return false;
	}

	// Deserialize a JSON object from the string
	TSharedPtr< FJsonObject > Object;
	TSharedRef< TJsonReader<> > Reader = TJsonReaderFactory<>::Create(FileContents);
	if ( !FJsonSerializer::Deserialize(Reader, Object) || !Object.IsValid() )
	{
		OutFailReason = FText::Format(LOCTEXT("FailedToReadDescriptorFile", "Failed to read file. {0}"), FText::FromString(Reader->GetErrorMessage()));
		return false;
	}

	// Parse it as a project descriptor
	return Read(*Object.Get(), OutFailReason);
}

bool FProjectDescriptor::Read(const FJsonObject& Object, FText& OutFailReason)
{
	// Read the file version
	int32 FileVersionInt32;
	if(!Object.TryGetNumberField(TEXT("FileVersion"), FileVersionInt32))
	{
		if(!Object.TryGetNumberField(TEXT("ProjectFileVersion"), FileVersionInt32))
		{
			OutFailReason = LOCTEXT("InvalidProjectFileVersion", "File does not have a valid 'FileVersion' number.");
			return false;
		}
	}

	// Check that it's within range
	FileVersion = (EProjectDescriptorVersion::Type)FileVersionInt32;
	if ( FileVersion <= EProjectDescriptorVersion::Invalid || FileVersion > EProjectDescriptorVersion::Latest )
	{
		FText ReadVersionText = FText::FromString( FString::Printf( TEXT( "%d" ), (int32)FileVersion ) );
		FText LatestVersionText = FText::FromString( FString::Printf( TEXT( "%d" ), (int32)EProjectDescriptorVersion::Latest ) );
		OutFailReason = FText::Format( LOCTEXT("ProjectFileVersionTooLarge", "File appears to be in a newer version ({0}) of the file format that we can load (max version: {1})."), ReadVersionText, LatestVersionText);
		return false;
	}

	// Read simple fields
	Object.TryGetStringField(TEXT("EngineAssociation"), EngineAssociation);
	Object.TryGetStringField(TEXT("Category"), Category);
	Object.TryGetStringField(TEXT("Description"), Description);

	// Read the modules
	if(!FModuleDescriptor::ReadArray(Object, TEXT("Modules"), Modules, OutFailReason))
	{
		return false;
	}

	// Read the plugins
	if(!FPluginReferenceDescriptor::ReadArray(Object, TEXT("Plugins"), Plugins, OutFailReason))
	{
		return false;
	}

	// Read the target platforms
	const TArray< TSharedPtr<FJsonValue> > *TargetPlatformsValue;
	if(Object.TryGetArrayField(TEXT("TargetPlatforms"), TargetPlatformsValue))
	{
		for(int32 Idx = 0; Idx < TargetPlatformsValue->Num(); Idx++)
		{
			FString TargetPlatform;
			if((*TargetPlatformsValue)[Idx]->TryGetString(TargetPlatform))
			{
				TargetPlatforms.Add(*TargetPlatform);
			}
		}
	}

	// Get the sample name hash
	Object.TryGetNumberField(TEXT("EpicSampleNameHash"), EpicSampleNameHash);
	return true;
}

bool FProjectDescriptor::Save(const FString& FileName, FText& OutFailReason)
{
	// Write the contents of the descriptor to a string. Make sure the writer is destroyed so that the contents are flushed to the string.
	FString Text;
	TSharedRef< TJsonWriter<> > Writer = TJsonWriterFactory<>::Create(&Text);
	Write(Writer.Get());
	Writer->Close();

	// Save it to a file
	if ( FFileHelper::SaveStringToFile(Text, *FileName) )
	{
		return true;
	}
	else
	{
		OutFailReason = FText::Format( LOCTEXT("FailedToWriteOutputFile", "Failed to write output file '{0}'. Perhaps the file is Read-Only?"), FText::FromString(FileName) );
		return false;
	}
}

void FProjectDescriptor::Write(TJsonWriter<>& Writer) const
{
	Writer.WriteObjectStart();

	// Write all the simple fields
	Writer.WriteValue(TEXT("FileVersion"), EProjectDescriptorVersion::Latest);
	Writer.WriteValue(TEXT("EngineAssociation"), EngineAssociation);
	Writer.WriteValue(TEXT("Category"), Category);
	Writer.WriteValue(TEXT("Description"), Description);

	// Write the module list
	FModuleDescriptor::WriteArray(Writer, TEXT("Modules"), Modules);

	// Write the plugin list
	FPluginReferenceDescriptor::WriteArray(Writer, TEXT("Plugins"), Plugins);

	// Write the target platforms
	if ( TargetPlatforms.Num() > 0 )
	{
		Writer.WriteArrayStart(TEXT("TargetPlatforms"));
		for(int Idx = 0; Idx < TargetPlatforms.Num(); Idx++)
		{
			Writer.WriteValue(TargetPlatforms[Idx].ToString());
		}
		Writer.WriteArrayEnd();
	}

	// If it's a signed sample, write the name hash
	if(EpicSampleNameHash != 0)
	{
		Writer.WriteValue(TEXT("EpicSampleNameHash"), FString::Printf(TEXT("%u"), EpicSampleNameHash));
	}

	Writer.WriteObjectEnd();
}

FString FProjectDescriptor::GetExtension()
{
	static const FString ProjectExtension(TEXT("uproject"));
	return ProjectExtension;
}

#undef LOCTEXT_NAMESPACE