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


#include "SMidiPatternThumbnail.h"

#include "SInvalidationPanel.h"
#include "SlateOptMacros.h"
#include "Render/UpdatableTexture.h"
#include "Pattern/MidiPattern.h"
#include "PluginHost/PluginHost.h"
#include "UI/Widget/SUpdatableImage.h"
#include "UI/Widget/Thumbnail.h"

BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION


SMidiPatternThumbnail::~SMidiPatternThumbnail()
{
	if (FMidiPattern* Pattern = (FMidiPattern*)GetPattern())
		Pattern->OnChanged.RemoveAll(this);
}

void SMidiPatternThumbnail::Construct(const FArguments& InArgs)
{
	ChildSlot
	[
		SNew(SInvalidationPanel)
		[
			SAssignNew(UpdatableImage, SUpdatableImage)
			.OnPostResize(this, &SMidiPatternThumbnail::UpdateMidiThumbnail)
		]
	];
}

void SMidiPatternThumbnail::Redraw()
{
	OnChanged(nullptr, nullptr);
}

void SMidiPatternThumbnail::OnPatternChanged(FPattern* OldPattern, FPattern* NewPattern)
{
	FMidiPattern* OldMidiPattern = (FMidiPattern*)OldPattern;
	FMidiPattern* NewMidiPattern = (FMidiPattern*)NewPattern;
	check(NewPattern->Type == EPatternType::Midi)
	
	if (OldMidiPattern)
		OldMidiPattern->OnChanged.RemoveAll(this);
	
	if (!NewMidiPattern)
		return;
	NewMidiPattern->OnChanged_MainThread.AddRaw(this, &SMidiPatternThumbnail::OnChanged);
}

void SMidiPatternThumbnail::OnChanged(FPluginHost* Host, FMidiMessageSequence* Changed)
{
	if (!GetPattern())
		return;
	UpdatableImage->NeedRedraw();
}

void SMidiPatternThumbnail::UpdateMidiThumbnail(FImageData& ImageData)
{
	if (!GetPattern())
		return;
	
	ImageData.ClearColor(FColor::Black);
	FMidiPattern* Pattern = (FMidiPattern*)GetPattern();
	Thumbnail::GenerateMidiPatternThumbnail(Pattern, ImageData, FColor::White);
}

END_SLATE_FUNCTION_BUILD_OPTIMIZATION