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

#pragma once

#include "CoreMinimal.h"
#include "SCompoundWidget.h"
#include "Singleton/MidiSequencer.h"

class SUpdatableTexture;
class FPatternInstance;
class FUpdatableTexture;

struct FPatternInstanceClickData
{
	FPatternInstance* PatternInstance;
	double MidiTimestampOffset;
};

DECLARE_DELEGATE_RetVal_OneParam(FReply, FPatternInstanceClickDelegate, FPatternInstanceClickData)

/**
 * 
 */
class ARONA_API SPatternInstance : public SCompoundWidget
{
public:

	enum class ResizeDir
	{
		None,
		Left,
		Right,
	};
	SLATE_BEGIN_ARGS(SPatternInstance)
		{}

	SLATE_ARGUMENT(FPatternInstance*, PatternInstance)
	SLATE_ATTRIBUTE(float, FrameToPixel)
	
	SLATE_ATTRIBUTE(AudioFrame, SnapFrame)
	SLATE_ATTRIBUTE(TRange<AudioFrame>, FrameViewRange)

	SLATE_END_ARGS()

	/** Constructs this widget with InArgs */
	virtual void Construct(const FArguments& InArgs);

	virtual FReply OnMouseButtonDown(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
	virtual FReply OnMouseButtonUp(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
	virtual FReply OnMouseMove(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;

	virtual TSharedRef<SWidget> GetViewWidget() = 0;
	virtual void RequestUpdate() = 0;
	
	FPatternInstance* GetPatternInstance() const { return PatternInstance; }
	TRange<AudioFrame> GetTimeRange() const { return PatternInstance->TimeRange; }
	TRange<AudioFrame> GetFrameViewRange() const { return FrameViewRange.Get(); }
	float ResizeHandleSize = 5.f;
protected:
	virtual FReply OpenPatternMenu() { return FReply::Unhandled(); }
	
	ResizeDir ResizeDirection = ResizeDir::None;

	FPatternInstance* PatternInstance = nullptr;
	
	TAttribute<float> FrameToPixel;
	TAttribute<AudioFrame> SnapFrame;
	TAttribute<TRange<AudioFrame>> FrameViewRange;
	
	FVector2f MouseDownPos; // 屏幕坐标
	AudioFrame BeginPatternEnd;
	AudioFrame BeginPatternStart;
	AudioFrame BeginPatternPos;

	mutable FVector2f LastSize;
};