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

/**
 * MaterialEditorInstanceConstant.h: This class is used by the material instance editor to hold a set of inherited parameters which are then pushed to a material instance.
 */

#pragma once

#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "UObject/Object.h"
#include "Misc/Guid.h"
#include "StaticParameterSet.h"
#include "Editor/UnrealEdTypes.h"
#include "Materials/MaterialInstanceBasePropertyOverrides.h"
#include "MaterialEditorInstanceConstant.h"
#include "MaterialEditorPreviewParameters.generated.h"

class UDEditorParameterValue;
class UMaterial;
class UMaterialInstanceConstant;
struct FPropertyChangedEvent;

UCLASS(hidecategories = Object, collapsecategories)
class UNREALED_API UMaterialEditorPreviewParameters: public UObject
{
    GENERATED_BODY()

public:
    UPROPERTY(EditAnywhere, editfixedsize, Category = UMaterialEditorPreviewParameters)
    TArray<struct FEditorParameterGroup> ParameterGroups;

    UPROPERTY()
    class UMaterial* PreviewMaterial;

    UPROPERTY()
    class UMaterialFunction* OriginalFunction;

    UPROPERTY()
    class UMaterial* OriginalMaterial;

#if WITH_EDITORONLY_DATA
    UPROPERTY()
    TArray<class UMaterialInstanceConstant*> StoredLayerPreviews;

    UPROPERTY()
    TArray<class UMaterialInstanceConstant*> StoredBlendPreviews;
#endif

    //~ Begin UObject Interface.
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
#if WITH_EDITOR
    virtual void PostEditUndo() override;
#endif
    //~ End UObject Interface.

    /** Regenerates the parameter arrays. */
    void RegenerateArrays();

protected:
    /** Copies the parameter array values back to the source instance. */
    void CopyToSourceInstance();

    void ApplySourceFunctionChanges();

    /**
    *  Creates/adds value to group retrieved from parent material .
    *
    * @param ParentMaterial		Name of material to search for groups.
    * @param ParameterValue		Current data to be grouped
    * @param OptionalGroupName	Optional Group Name that be used directly instead of resolving it from the material

    */
    void AssignParameterToGroup(UMaterial* ParentMaterial, UDEditorParameterValue* ParameterValue, FName* OptionalGroupName = nullptr);

    static FName GlobalGroupPrefix;
};