// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "NiagaraEditorCommon.h"
#include "NiagaraNode.h"
#include "NiagaraNodeInput.h"
#include "NiagaraNodeFunctionCall.generated.h"

class UNiagaraScript;

UCLASS(MinimalAPI)
class UNiagaraNodeFunctionCall : public UNiagaraNode
{
	GENERATED_BODY()

public:

	UPROPERTY(EditAnywhere, Category = "Function")
	UNiagaraScript* FunctionScript;

	/** 
	 * A path to a script asset which can be used to assign the function script the first time that
	 * default pins are generated. This is used so that the function nodes can be populated in the graph context
	 * menu without having to load all of the actual script assets.
	 */
	UPROPERTY(Transient)
	FName FunctionScriptAssetObjectPath;

	/** Some functions can be provided a signature directly rather than a script. */
	UPROPERTY()
	FNiagaraFunctionSignature Signature;

	//Begin UObject interface
	virtual void PostLoad()override;
	virtual void PostEditChangeProperty(struct FPropertyChangedEvent& PropertyChangedEvent)override;
	//End UObject interface

	//~ Begin UNiagaraNode Interface
	virtual void Compile(class INiagaraCompiler* Compiler, TArray<int32>& Outputs)override;
	virtual UObject* GetReferencedAsset() const override;
	virtual bool RefreshFromExternalChanges() override;
	virtual ENiagaraNumericOutputTypeSelectionMode GetNumericOutputTypeSelectionMode() const override;
	virtual bool CanAddToGraph(UNiagaraGraph* TargetGraph, FString& OutErrorMsg) const override;
	virtual void SubsumeExternalDependencies(TMap<UObject*, UObject*>& ExistingConversions) override;
	//End UNiagaraNode interface

	//~ Begin EdGraphNode Interface
	virtual void AllocateDefaultPins() override;
	virtual FText GetNodeTitle(ENodeTitleType::Type TitleType) const override;
	virtual FText GetTooltipText() const override;
	virtual FLinearColor GetNodeTitleColor() const override;
	//~ End EdGraphNode Interface

	bool FindAutoBoundInput(UNiagaraNodeInput* InputNode, UEdGraphPin* PinToAutoBind, FNiagaraVariable& OutFoundVar, ENiagaraInputNodeUsage& OutNodeUsage);

protected:

	/** Adjusted every time that we compile this script. Lets us know that we might differ from any cached versions.*/
	UPROPERTY()
	FGuid CachedChangeId;
};