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

/**
 * Fbx Importer UI options.
 */

#pragma once

#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "UObject/Object.h"
#include "FbxSceneImportOptionsStaticMesh.generated.h"

UENUM(BlueprintType)
enum class EFbxSceneVertexColorImportOption : uint8
{
    /** Import the static mesh using the vertex colors from the FBX file. */
    Replace,
    /** Ignore vertex colors from the FBX file, and keep the existing mesh vertex colors. */
    Ignore,
    /** Override all vertex colors with the specified color. */
    Override
};

UENUM(BlueprintType)
enum class EFBXSceneNormalImportMethod : uint8
{
    FBXSceneNIM_ComputeNormals UMETA(DisplayName = "Compute Normals"),
    FBXSceneNIM_ImportNormals UMETA(DisplayName = "Import Normals"),
    FBXSceneNIM_ImportNormalsAndTangents UMETA(DisplayName = "Import Normals and Tangents"),
    FBXSceneNIM_MAX,
};

UENUM(BlueprintType)
enum class EFBXSceneNormalGenerationMethod : uint8
{
    /** Use the legacy built in method to generate normals (faster in some cases) */
    BuiltIn,
    /** Use MikkTSpace to generate normals and tangents */
    MikkTSpace,
};

UCLASS(BlueprintType, config = EditorPerProjectUserSettings, HideCategories = Object, MinimalAPI)
class UFbxSceneImportOptionsStaticMesh: public UObject
{
    GENERATED_UCLASS_BODY()

    //////////////////////////////////////////////////////////////////////////
    // Static Mesh section

    /** For static meshes, enabling this option will combine all meshes in the FBX into a single monolithic mesh in Unreal */
    UPROPERTY()
    FName StaticMeshLODGroup;

    /** If checked, collision will automatically be generated (ignored if custom collision is imported or used). */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh, DisplayName = "Generate Missing Collision")
    uint32 bAutoGenerateCollision : 1;

    /** Specify how vertex colors should be imported */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    EFbxSceneVertexColorImportOption VertexColorImportOption;

    /** Specify override color in the case that VertexColorImportOption is set to Override */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    FColor VertexOverrideColor;

    /** Disabling this option will keep degenerate triangles found.  In general you should leave this option on. */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    uint32 bRemoveDegenerates : 1;

    /** Required for PNT tessellation but can be slow. Recommend disabling for larger meshes. */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    uint32 bBuildAdjacencyBuffer : 1;

    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    uint32 bBuildReversedIndexBuffer : 1;

    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    uint32 bGenerateLightmapUVs : 1;

    /** If checked, one convex hull per UCX_ prefixed collision mesh will be generated instead of decomposing into multiple hulls */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    uint32 bOneConvexHullPerUCX : 1;

    /** Enabling this option will read the tangents(tangent,binormal,normal) from FBX file instead of generating them automatically. */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    EFBXSceneNormalImportMethod NormalImportMethod;

    /** Use the MikkTSpace tangent space generator for generating normals and tangents on the mesh */
    UPROPERTY(EditAnywhere, config, Category = StaticMesh)
    EFBXSceneNormalGenerationMethod NormalGenerationMethod;

    void FillStaticMeshInmportData(class UFbxStaticMeshImportData* StaticMeshImportData, class UFbxSceneImportOptions* SceneImportOptions);
};