// Copyright Epic Games, Inc. All Rights Reserved.
#include "MetasoundTriggerToggleNode.h"

#include "CoreMinimal.h"

#include "MetasoundBuilderInterface.h"
#include "MetasoundDataReferenceCollection.h"
#include "MetasoundExecutableOperator.h"
#include "MetasoundFacade.h"
#include "MetasoundNode.h"
#include "MetasoundNodeInterface.h"
#include "MetasoundNodeRegistrationMacro.h"
#include "MetasoundOperatorInterface.h"
#include "MetasoundPrimitives.h"
#include "MetasoundStandardNodesNames.h"
#include "MetasoundStandardNodesCategories.h"
#include "MetasoundVertex.h"

#define LOCTEXT_NAMESPACE "MetasoundStandardNodes_Toggle"

namespace Metasound
{
	namespace TriggerToggle
	{
		const FVertexName GetInputOnTriggerName() { return TEXT("On"); }
		const FVertexName GetInputOffTriggerName() { return TEXT("Off"); }
		const FVertexName GetInputInitName() { return TEXT("Init"); }
		const FVertexName GetOutputTriggerName() { return TEXT("Out"); }
		const FVertexName GetOutputValueName() { return TEXT("Value"); }
	}

	class FTriggerToggleOperator : public TExecutableOperator<FTriggerToggleOperator>
	{
		public:
			static const FNodeClassMetadata& GetNodeInfo();
			static const FVertexInterface& GetVertexInterface();
			static TUniquePtr<IOperator> CreateOperator(const FCreateOperatorParams& InParams, FBuildErrorArray& OutErrors);

			FTriggerToggleOperator(const FOperatorSettings& InSettings, const FTriggerReadRef& InTriggerOn, const FTriggerReadRef& InTriggerOff, const FBoolReadRef& InInitValue);

			virtual FDataReferenceCollection GetInputs() const override;
			virtual FDataReferenceCollection GetOutputs() const override;

			void Execute();

		private:

			FTriggerReadRef TriggerOn;
			FTriggerReadRef TriggerOff;
			FBoolReadRef InitValue;
			FTriggerWriteRef TriggerOutput;
			FBoolWriteRef ValueOutput;
	};

	FTriggerToggleOperator::FTriggerToggleOperator(const FOperatorSettings& InSettings, const FTriggerReadRef& InTriggerOn, const FTriggerReadRef& InTriggerOff, const FBoolReadRef& InInitValue)
	: TriggerOn(InTriggerOn)
	, TriggerOff(InTriggerOff)
	, InitValue(InInitValue)
	, TriggerOutput(FTriggerWriteRef::CreateNew(InSettings))
	, ValueOutput(FBoolWriteRef::CreateNew(*InInitValue))
	{
	}

	FDataReferenceCollection FTriggerToggleOperator::GetInputs() const
	{
		using namespace TriggerToggle;

		FDataReferenceCollection InputDataReferences;
		InputDataReferences.AddDataReadReference(GetInputOnTriggerName(), TriggerOn);
		InputDataReferences.AddDataReadReference(GetInputOffTriggerName(), TriggerOff);
		InputDataReferences.AddDataReadReference(GetInputInitName(), InitValue);
		return InputDataReferences;
	}

	FDataReferenceCollection FTriggerToggleOperator::GetOutputs() const
	{
		using namespace TriggerToggle;

		FDataReferenceCollection OutputDataReferences;
		OutputDataReferences.AddDataReadReference(GetOutputTriggerName(), TriggerOutput);
		OutputDataReferences.AddDataReadReference(GetOutputValueName(), ValueOutput);

		return OutputDataReferences;
	}

	void FTriggerToggleOperator::Execute()
	{
		TriggerOutput->AdvanceBlock();

		TriggerOn->ExecuteBlock(
			[&](int32 StartFrame, int32 EndFrame)
			{
			},
			[this](int32 StartFrame, int32 EndFrame)
			{
				*ValueOutput = true;
				TriggerOutput->TriggerFrame(StartFrame);
			}
		);

		TriggerOff->ExecuteBlock(
			[&](int32 StartFrame, int32 EndFrame)
			{
			},
			[this](int32 StartFrame, int32 EndFrame)
			{
				*ValueOutput = false;
				TriggerOutput->TriggerFrame(StartFrame);
			}
		);
	}

	TUniquePtr<IOperator> FTriggerToggleOperator::CreateOperator(const FCreateOperatorParams& InParams, FBuildErrorArray& OutErrors)
	{
		using namespace TriggerToggle;

		const FInputVertexInterface& InputInterface = GetVertexInterface().GetInputInterface();
		FTriggerReadRef InTriggerOn = InParams.InputDataReferences.GetDataReadReferenceOrConstruct<FTrigger>(GetInputOnTriggerName(), InParams.OperatorSettings);
		FTriggerReadRef InTriggerOff = InParams.InputDataReferences.GetDataReadReferenceOrConstruct<FTrigger>(GetInputOffTriggerName(), InParams.OperatorSettings);
		FBoolReadRef InInitValue = InParams.InputDataReferences.GetDataReadReferenceOrConstructWithVertexDefault<bool>(InputInterface, GetInputInitName(), InParams.OperatorSettings);

		return MakeUnique<FTriggerToggleOperator>(InParams.OperatorSettings, InTriggerOn, InTriggerOff, InInitValue);
	}

	const FVertexInterface& FTriggerToggleOperator::GetVertexInterface()
	{
		using namespace TriggerToggle;

		static const FVertexInterface Interface(
			FInputVertexInterface(
				TInputDataVertexModel<FTrigger>(GetInputOnTriggerName(), LOCTEXT("TriggerGateOnTT", "Trigger to toggle gate output to 1.")),
				TInputDataVertexModel<FTrigger>(GetInputOffTriggerName(), LOCTEXT("TriggerGateOffTT", "Trigger to toggle gate output to 0.")),
				TInputDataVertexModel<bool>(GetInputInitName(), LOCTEXT("TriggerGateInitTT", "Initial value of the output gate."))
			),
			FOutputVertexInterface(
				TOutputDataVertexModel<FTrigger>(GetOutputTriggerName(), LOCTEXT("TriggerGateOutputTriggerTT", "Triggers output when gate is toggled.")),
				TOutputDataVertexModel<bool>(GetOutputValueName(), LOCTEXT("TriggerGateOutputTriggerTT", "Current output value of the toggle."))
			)
		);

		return Interface;
	}

	const FNodeClassMetadata& FTriggerToggleOperator::GetNodeInfo()
	{
		auto InitNodeInfo = []() -> FNodeClassMetadata
		{
			FNodeClassMetadata Info;
			Info.ClassName = {StandardNodes::Namespace, TEXT("Trigger Toggle"), TEXT("")};
			Info.MajorVersion = 1;
			Info.MinorVersion = 0;
			Info.DisplayName = LOCTEXT("Metasound_TriggerToggleNodeDisplayName", "Trigger Toggle");
			Info.Description = LOCTEXT("Metasound_TriggerToggleNodeDescription", "Toggles a boolean value on or off.");
			Info.Author = PluginAuthor;
			Info.PromptIfMissing = PluginNodeMissingPrompt;
			Info.DefaultInterface = GetVertexInterface();
			Info.CategoryHierarchy.Emplace(NodeCategories::Trigger);

			return Info;
		};

		static const FNodeClassMetadata Info = InitNodeInfo();
		return Info;
	}

	FTriggerToggleNode::FTriggerToggleNode(const FNodeInitData& InInitData)
	:	FNodeFacade(InInitData.InstanceName, InInitData.InstanceID, TFacadeOperatorClass<FTriggerToggleOperator>())
	{
	}

	METASOUND_REGISTER_NODE(FTriggerToggleNode)
}

#undef LOCTEXT_NAMESPACE // MetasoundTriggerDelayNode