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

/*=============================================================================
        EditorComponents.h: Scene components used by the editor modes.
=============================================================================*/

#pragma once

#include "CoreMinimal.h"
#include "Engine/EngineTypes.h"
#include "UObject/GCObject.h"

class FPrimitiveDrawInterface;
class FSceneView;
class UMaterial;
class UMaterialInstanceDynamic;

class FGridWidget: public FGCObject
{
public:
    FGridWidget();

    void DrawNewGrid(const FSceneView* View, FPrimitiveDrawInterface* PDI);

    /**
     * FGCObject interface: Serializes the widget reference so they dont get garbage collected.
     *
     * @param Ar	FArchive to serialize with
     */
    virtual void AddReferencedObjects(FReferenceCollector& Collector) override;
    virtual FString GetReferencerName() const override
    {
        return "FGridWidget";
    }

private:
    // ALU based
    UMaterial* LevelGridMaterial;
    UMaterialInstanceDynamic* LevelGridMaterialInst;
    // texture based
    UMaterial* LevelGridMaterial2;
    UMaterialInstanceDynamic* LevelGridMaterialInst2;
};

/**
 * Implements some basic functionality used by all editor viewports.
 */
class FEditorCommonDrawHelper
{
public:
    UNREALED_API FEditorCommonDrawHelper();
    virtual UNREALED_API ~FEditorCommonDrawHelper();

    /** Renders the grid, pivot, and base info. */
    virtual void UNREALED_API Draw(const FSceneView* View, FPrimitiveDrawInterface* PDI);

    /**
     * Renders the editor's pivot.
     */
    void DrawPivot(const FSceneView* View, FPrimitiveDrawInterface* PDI);

    /** Draw green lines to indicate what the selected actor(s) are based on. */
    void DrawBaseInfo(const FSceneView* View, FPrimitiveDrawInterface* PDI);

private:
    /** Types of axis lines we can draw for orthographic views */
    struct EAxisLines
    {
        enum Type
        {
            // Major lines
            Major,

            // Minor lines
            Minor,
        };
    };

    /**
     * Draws a section(vertical lines or horizontal lines) of a viewport's grid.
     */
    static void DrawGridSection(float ViewportGridY, FVector* A, FVector* B, float* AX, float* BX, int32 Axis, const FSceneView* View, FPrimitiveDrawInterface* PDI);

    /**
     * Draws an origin axis line for the orthographic grid
     */
    static void DrawOriginAxisLine(FVector* A, FVector* B, float* AX, float* BX, const FSceneView* View, FPrimitiveDrawInterface* PDI, const FLinearColor& Color);

    /** Draws the viewport grid. */
    void DrawOldGrid(const FSceneView* View, FPrimitiveDrawInterface* PDI);

public:
    uint32 bDrawGrid     : 1;
    uint32 bDrawPivot    : 1;
    uint32 bDrawBaseInfo : 1;
    uint32 bDrawWorldBox : 1;
    uint32 bDrawKillZ    : 1;
    float AxesLineThickness;

    /** Color of the grid on the main axes lines */
    FColor GridColorAxis;

    /** Color of the grid on major axes lines (every Nth grid step line) */
    FColor GridColorMajor;

    /** Color of grid lines at each grid interval */
    FColor GridColorMinor;

    float PerspectiveGridSize;

    FColor PivotColor;
    float PivotSize;

    /** The number of cells to draw. */
    int32 NumCells;

    FColor BaseBoxColor;

    ESceneDepthPriorityGroup DepthPriorityGroup;

    float GridDepthBias;

    FGridWidget* GridWidget;
};

namespace EditorActorSelectionDefs
{
/** The maximum number of actors we should select before a performance warning message is displayed to the user */
static const int32 MaxActorsToSelectBeforeWarning = 5000;
};  // namespace EditorActorSelectionDefs