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


#include "SPatternSelector.h"

#include "SPatternThumbnail.h"
#include "SInvalidationPanel.h"
#include "SlateOptMacros.h"
#include "SMenuAnchor.h"
#include "SScrollBox.h"
#include "Singleton/MidiSequencer.h"
#include "UI/Widget/ChannelRack/ChannelRackMidiThumbnail.h"

BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION

void SPatternSelector::Construct(const FArguments& InArgs)
{
	FPatternSelector::Get().OnPatternSelected.AddRaw(this, &SPatternSelector::OnPatternSelected);
	FPatternSelector::Get().OnPatternDeselected.AddRaw(this, &SPatternSelector::OnPatternDeselected);
	PatternList = SNew(SScrollBox);
	ChildSlot
	[
		SAssignNew(MenuAnchor, SMenuAnchor)
		.OnGetMenuContent(this, &SPatternSelector::CreatePatternList)
		.Placement(EMenuPlacement::MenuPlacement_ComboBox)
		[
			SAssignNew(SelectPatternName, STextBlock)
		]
	];

	FMidiSequencer::Get().OnNewPattern.AddRaw(this, &SPatternSelector::OnNewPattern);
	FMidiSequencer::Get().OnDeletePattern.AddRaw(this, &SPatternSelector::OnDeletePattern);

	for (FPattern* MidiPattern : FMidiSequencer::Get().GetPattern(EPatternType::Midi))
	{
		OnNewPattern(MidiPattern);
	}
}

FReply SPatternSelector::OnMouseButtonDown(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	if (MouseEvent.GetEffectingButton() == EKeys::LeftMouseButton)
	{
		MenuAnchor->SetIsOpen(true);
	}
	return SCompoundWidget::OnMouseButtonDown(MyGeometry, MouseEvent);
}

void SPatternSelector::OnPatternSelected(FPattern* Pattern)
{
	SelectPatternName->SetText(FText::FromString(Pattern->Name));
	MenuAnchor->SetIsOpen(false);
	FPatternSelector::Get().SelectPattern(Pattern);
}

void SPatternSelector::OnPatternDeselected(FPattern* Pattern)
{
	SelectPatternName->SetText(FText::FromString("无"));
}

void SPatternSelector::OnNewPattern(FPattern* Pattern)
{
	const TSharedRef<SAutoPatternThumbnail> PatternThumbnail = SNew(SAutoPatternThumbnail, Pattern);
	PatternThumbnail->OnPatternClicked.AddRaw(this, &SPatternSelector::OnPatternSelected);
	PatternList->AddSlot()
	.HAlign(HAlign_Fill)
	[
		PatternThumbnail
	];
}

void SPatternSelector::OnDeletePattern(FPattern* Pattern)
{
	const TSharedPtr<SScrollPanel>& ScrollPanel = PatternList->GetScrollPanel();
	FChildren* Children = ScrollPanel->GetChildren();
	for (int32 i = 0; i < Children->Num(); ++i)
	{
		TSharedRef<SWidget> Child = Children->GetChildAt(i);
		TSharedRef<SAutoPatternThumbnail> ThumbnailWidget = StaticCastSharedRef<SAutoPatternThumbnail>(Child);
		if (ThumbnailWidget->GetPattern() == Pattern)
		{
			PatternList->RemoveSlot(Child);
			break;
		}
	}
}

TSharedRef<SWidget> SPatternSelector::CreatePatternList()
{
	return PatternList.ToSharedRef();
}

END_SLATE_FUNCTION_BUILD_OPTIMIZATION