// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "HAL/Platform.h"
#include "MuR/Image.h"
#include "MuR/Operations.h"
#include "MuR/ParametersPrivate.h"
#include "MuR/Ptr.h"
#include "MuT/AST.h"


namespace mu
{
	struct FProgram;


	/** Parameter operation. */
	class ASTOpParameter final : public ASTOp
	{
	public:

		//! Type of parameter
		EOpType Type = EOpType::NONE;

		//!
		FParameterDesc Parameter;

		/** Used by some parameter types (Mesh) to specify which subdata from the actual parameter value should be used in the operation. */
		int32 LODIndex = 0;
		int32 SectionIndex = 0;
		uint32 MeshID = 0;

		//** Ranges adding dimensions to this parameter. */
		TArray<FRangeData> Ranges;

		/** Index of the parameter in the final program parameter list. 
		* This is generated at link time, because the parameters may be reordered. 
		*/
		int32 LinkedParameterIndex = -1;

	public:

		~ASTOpParameter() override;

		// ASTOp interface.
		virtual EOpType GetOpType() const override;
		virtual uint64 Hash() const override;
		virtual void ForEachChild(const TFunctionRef<void(ASTChild&)>) override;
		virtual bool IsEqual(const ASTOp&) const override;
		virtual Ptr<ASTOp> Clone(MapChildFuncRef ) const override;
		virtual void Assert() override;
		virtual void Link(FProgram&, FLinkerOptions*) override;
		virtual int EvaluateInt(ASTOpList& Facts, bool& bOutUnknown) const override;
		virtual FBoolEvalResult EvaluateBool(ASTOpList& Facts, FEvaluateBoolCache* = nullptr) const override;
		virtual FImageDesc GetImageDesc(bool, FGetImageDescContext*) const override;
		virtual bool IsColourConstant(FVector4f& OutColour) const override;

	};

}