// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once

#include "CoreMinimal.h"

#include "EdGraph/EdGraph.h"
#include "MetasoundAssetBase.h"
#include "MetasoundFrontend.h"
#include "MetasoundFrontendDocument.h"
#include "MetasoundOperatorSettings.h"
#include "MetasoundRouter.h"

#if WITH_EDITORONLY_DATA
#include "Algo/Transform.h"
#endif // WITH_EDITORONLY_DATA

#include "Metasound.generated.h"


namespace Metasound
{
	namespace ConsoleVariables
	{
		static float BlockRate = 100.f;
	} // namespace ConsoleVariables

	template <typename TMetaSoundObject>
	void PostEditChangeProperty(TMetaSoundObject& InMetaSound, FPropertyChangedEvent& InEvent)
	{
		// TODO: Update registry info here if interface has changed,
		// potentially enabling removal of PreSave registration
	}

#if WITH_EDITORONLY_DATA
	template <typename TMetaSoundObject>
	void SetMetaSoundRegistryAssetClassInfo(TMetaSoundObject& InMetaSound, const Metasound::Frontend::FNodeClassInfo& InClassInfo)
	{
		using namespace Metasound;

		check(AssetTags::AssetClassID == GET_MEMBER_NAME_CHECKED(TMetaSoundObject, AssetClassID));
		check(AssetTags::RegistryInputTypes == GET_MEMBER_NAME_CHECKED(TMetaSoundObject, RegistryInputTypes));
		check(AssetTags::RegistryOutputTypes == GET_MEMBER_NAME_CHECKED(TMetaSoundObject, RegistryOutputTypes));
		check(AssetTags::RegistryVersionMajor == GET_MEMBER_NAME_CHECKED(TMetaSoundObject, RegistryVersionMajor));
		check(AssetTags::RegistryVersionMinor == GET_MEMBER_NAME_CHECKED(TMetaSoundObject, RegistryVersionMinor));

		bool bMarkDirty = InMetaSound.AssetClassID != InClassInfo.AssetClassID;
		bMarkDirty |= InMetaSound.RegistryVersionMajor != InClassInfo.Version.Major;
		bMarkDirty |= InMetaSound.RegistryVersionMinor != InClassInfo.Version.Minor;

		InMetaSound.AssetClassID = InClassInfo.AssetClassID;
		InMetaSound.RegistryVersionMajor = InClassInfo.Version.Major;
		InMetaSound.RegistryVersionMinor = InClassInfo.Version.Minor;

		{
			TArray<FString> InputTypes;
			Algo::Transform(InClassInfo.InputTypes, InputTypes, [](const FName& Name) { return Name.ToString(); });

			const FString TypeString = FString::Join(InputTypes, *AssetTags::ArrayDelim);
			bMarkDirty |= InMetaSound.RegistryInputTypes != TypeString;
			InMetaSound.RegistryInputTypes = TypeString;
		}

		{
			TArray<FString> OutputTypes;
			Algo::Transform(InClassInfo.OutputTypes, OutputTypes, [](const FName& Name) { return Name.ToString(); });

			const FString TypeString = FString::Join(OutputTypes, *AssetTags::ArrayDelim);
			bMarkDirty |= InMetaSound.RegistryOutputTypes != TypeString;
			InMetaSound.RegistryOutputTypes = TypeString;
		}
	}
#endif // WITH_EDITORONLY_DATA
} // namespace Metasound

UCLASS()
class METASOUNDENGINE_API UMetasoundEditorGraphBase : public UEdGraph
{
	GENERATED_BODY()

public:
	virtual bool IsEditorOnly() const override { return true; }
	virtual bool NeedsLoadForEditorGame() const override { return false; }

	virtual void Synchronize() { }
};


/**
 * This asset type is used for Metasound assets that can only be used as nodes in other Metasound graphs.
 * Because of this, they contain no required inputs or outputs.
 */
UCLASS(hidecategories = object, BlueprintType)
class METASOUNDENGINE_API UMetaSound : public UObject, public FMetasoundAssetBase
{
	GENERATED_BODY()

protected:
	UPROPERTY(EditAnywhere, Category = CustomView)
	FMetasoundFrontendDocument RootMetaSoundDocument;

#if WITH_EDITORONLY_DATA
	UPROPERTY()
	UMetasoundEditorGraphBase* Graph;
#endif // WITH_EDITORONLY_DATA

public:
	UMetaSound(const FObjectInitializer& ObjectInitializer);

	UPROPERTY(AssetRegistrySearchable)
	FGuid AssetClassID;

#if WITH_EDITORONLY_DATA
	UPROPERTY(AssetRegistrySearchable)
	FString RegistryInputTypes;

	UPROPERTY(AssetRegistrySearchable)
	FString RegistryOutputTypes;

	UPROPERTY(AssetRegistrySearchable)
	int32 RegistryVersionMajor = 0;

	UPROPERTY(AssetRegistrySearchable)
	int32 RegistryVersionMinor = 0;

	// Sets Asset Registry Metadata associated with this MetaSound
	virtual void SetRegistryAssetClassInfo(const Metasound::Frontend::FNodeClassInfo& InClassInfo) override;

	// Returns document name (for editor purposes, and avoids making document public for edit
	// while allowing editor to reference directly)
	static FName GetDocumentPropertyName()
	{
		return GET_MEMBER_NAME_CHECKED(UMetaSound, RootMetaSoundDocument);
	}

	// Name to display in editors
	virtual FText GetDisplayName() const override;

	// Returns the graph associated with this Metasound. Graph is required to be referenced on
	// Metasound UObject for editor serialization purposes.
	// @return Editor graph associated with UMetaSoundSource.
	virtual UEdGraph* GetGraph() override;
	virtual const UEdGraph* GetGraph() const override;
	virtual UEdGraph& GetGraphChecked() override;
	virtual const UEdGraph& GetGraphChecked() const override;

	// Sets the graph associated with this Metasound. Graph is required to be referenced on
	// Metasound UObject for editor serialization purposes.
	// @param Editor graph associated with UMetaSoundSource.
	virtual void SetGraph(UEdGraph* InGraph) override
	{
		Graph = CastChecked<UMetasoundEditorGraphBase>(InGraph);
	}
#endif // #if WITH_EDITORONLY_DATA

#if WITH_EDITOR
	virtual void PreSave(FObjectPreSaveContext SaveContext) override;
	virtual void PostEditUndo() override;
	virtual void PostEditChangeProperty(FPropertyChangedEvent& InEvent) override;
#endif // WITH_EDITOR

	// Returns Asset Metadata associated with this MetaSound
	virtual Metasound::Frontend::FNodeClassInfo GetAssetClassInfo() const override;

	virtual const FMetasoundFrontendVersion& GetDefaultArchetypeVersion() const override;

	UObject* GetOwningAsset() override
	{
		return this;
	}

	const UObject* GetOwningAsset() const override
	{
		return this;
	}

	TUniquePtr<IAudioInstanceTransmitter> CreateInstanceTransmitter(const FAudioInstanceTransmitterInitParams& InParams) const;

	// Get the most up to date archetype for metasound sources.
	const TArray<FMetasoundFrontendVersion>& GetSupportedArchetypeVersions() const override;

protected:

	Metasound::Frontend::FDocumentAccessPtr GetDocument() override
	{
		using namespace Metasound::Frontend;
		// Return document using FAccessPoint to inform the TAccessPtr when the 
		// object is no longer valid.
		return MakeAccessPtr<FDocumentAccessPtr>(RootMetaSoundDocument.AccessPoint, RootMetaSoundDocument);
	}

	Metasound::Frontend::FConstDocumentAccessPtr GetDocument() const override
	{
		using namespace Metasound::Frontend;
		// Return document using FAccessPoint to inform the TAccessPtr when the 
		// object is no longer valid.
		return MakeAccessPtr<FConstDocumentAccessPtr>(RootMetaSoundDocument.AccessPoint, RootMetaSoundDocument);
	}

	bool CopyDocumentAndInjectReceiveNodes(uint64 InInstanceID, const FMetasoundFrontendDocument& InSourceDoc, FMetasoundFrontendDocument& OutDestDoc) const;	

private:
	TArray<FString> GetTransmittableInputVertexNames() const;
	Metasound::FOperatorSettings GetOperatorSettings(Metasound::FSampleRate InSampleRate) const;
	Metasound::FSendAddress CreateSendAddress(uint64 InInstanceID, const FString& InVertexName, const FName& InDataTypeName) const;
	static const FString& GetAudioDeviceHandleVariableName();
	static const FMetasoundFrontendArchetype& GetBaseArchetype();
};