// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "UObject/NoExportTypes.h"
#include "Engine/Texture2D.h"
#include <memory>
#include "PlotCanvas.generated.h"

/**
 * 
 */
UCLASS(Blueprintable, BlueprintType)
class IMMERSIVEANALYTICS_API UPlotCanvas : public UObject
{
	GENERATED_BODY()

public:

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Variables)
		UTexture2D* dynamicCanvas;

	UFUNCTION(BlueprintCallable, Category = DrawingTools)
		void InitializeCanvas(const int32 pixelsH, const int32 pixelsV);
	UFUNCTION(BlueprintCallable, Category = DrawingTools)
		void UpdateCanvas();
	UFUNCTION(BlueprintCallable, Category = DrawingTools)
		void ClearCanvas();

	UFUNCTION(BlueprintCallable, Category = DrawingTools)
		void InitializeDrawingTools(const int32 brushRadius, uint8 r, uint8 g, uint8 b);

	UFUNCTION(BlueprintCallable, Category = DrawingTools)
		void DrawFromData();

	UFUNCTION(BlueprintCallable, Category = DrawingTools)
		void DrawDot(const int32 pixelCoordX, const int32 pixelCoordY);

private:

	// canvas
	std::unique_ptr<uint8[]> canvasPixelData;
	int canvasWidth;
	int canvasHeight;
	int bytesPerPixel;
	int bufferPitch;
	int bufferSize;

	// draw brush tool
	std::unique_ptr<uint8[]> canvasBrushMask;
	int radius;
	int brushBufferSize;

	std::unique_ptr<FUpdateTextureRegion2D> echoUpdateTextureRegion;
	void setPixelColor(uint8*& pointer, uint8 red, uint8 green, uint8 blue, uint8 alpha);
};