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

#include "VirtualShadowMapVisualizationMenuCommands.h"
#include "VirtualShadowMapVisualizationData.h"
#include "Containers/UnrealString.h"
#include "Framework/Commands/InputChord.h"
#include "Materials/Material.h"
#include "Internationalization/Text.h"
#include "Templates/Function.h"
#include "Styling/AppStyle.h"
#include "EditorViewportClient.h"

int32 GVirtualShadowMapVisualizeAdvanced = 0;
static FAutoConsoleVariableRef CVarVirtualShadowMapVisualizeAdvanced(
	TEXT("r.Shadow.Virtual.Visualize.Advanced"),
	GVirtualShadowMapVisualizeAdvanced,
	TEXT("")
);

#define LOCTEXT_NAMESPACE "VirtualShadowMapVisualizationMenuCommands"

FVirtualShadowMapVisualizationMenuCommands::FVirtualShadowMapVisualizationMenuCommands()
	: TCommands<FVirtualShadowMapVisualizationMenuCommands>
	(
		TEXT("VirtualShadowMapVisualizationMenu"), // Context name for fast lookup
		NSLOCTEXT("Contexts", "VirtualShadowMapVisualizationMenu", "VirtualShadowMa Visualization"), // Localized context name for displaying
		NAME_None, // Parent context name.  
		FAppStyle::GetAppStyleSetName() // Icon Style Set
	),
	CommandMap()
{
}

void FVirtualShadowMapVisualizationMenuCommands::BuildCommandMap()
{
	const FVirtualShadowMapVisualizationData& VisualizationData = GetVirtualShadowMapVisualizationData();
	const FVirtualShadowMapVisualizationData::TModeMap& ModeMap = VisualizationData.GetModeMap();

	CommandMap.Empty();
	for (FVirtualShadowMapVisualizationData::TModeMap::TConstIterator It = ModeMap.CreateConstIterator(); It; ++It)
	{
		const FVirtualShadowMapVisualizationData::FModeRecord& Entry = It.Value();
		FVirtualShadowMapVisualizationRecord& Record = CommandMap.Add(Entry.ModeName, FVirtualShadowMapVisualizationRecord());
		Record.Name = Entry.ModeName;
		Record.Command = FUICommandInfoDecl(
			this->AsShared(),
			Entry.ModeName,
			Entry.ModeText,
			Entry.ModeDesc)
			.UserInterfaceType(EUserInterfaceActionType::RadioButton)
			.DefaultChord(FInputChord());

		switch (Entry.ModeType)
		{
		case FVirtualShadowMapVisualizationData::FModeType::Standard:
			Record.Type = FVirtualShadowMapVisualizationType::Standard;
			break;

		default:
		case FVirtualShadowMapVisualizationData::FModeType::Advanced:
			Record.Type = FVirtualShadowMapVisualizationType::Advanced;
			break;
		}
	}
}

void FVirtualShadowMapVisualizationMenuCommands::BuildVisualisationSubMenu(FMenuBuilder& Menu)
{
	const bool bShowAdvanced = GVirtualShadowMapVisualizeAdvanced != 0;

	const FVirtualShadowMapVisualizationMenuCommands& Commands = FVirtualShadowMapVisualizationMenuCommands::Get();
	if (Commands.IsPopulated())
	{
		Menu.BeginSection("LevelViewportVirtualShadowMapVisualizationMode", LOCTEXT("VirtualShadowMapVisualizationHeader", "Visualization Mode"));

		Commands.AddCommandTypeToMenu(Menu, FVirtualShadowMapVisualizationType::Standard, false);
		if (bShowAdvanced)
		{
			Commands.AddCommandTypeToMenu(Menu, FVirtualShadowMapVisualizationType::Advanced, true);
		}

		Menu.EndSection();
	}
}

bool FVirtualShadowMapVisualizationMenuCommands::AddCommandTypeToMenu(FMenuBuilder& Menu, const FVirtualShadowMapVisualizationType Type, bool bSeparatorBefore) const
{
	bool bAddedCommands = false;

	const TVirtualShadowMapVisualizationModeCommandMap& Commands = CommandMap;
	for (TCommandConstIterator It = CreateCommandConstIterator(); It; ++It)
	{
		const FVirtualShadowMapVisualizationRecord& Record = It.Value();
		if (Record.Type == Type)
		{
			if (!bAddedCommands && bSeparatorBefore)
			{
				Menu.AddMenuSeparator();
			}
			Menu.AddMenuEntry(Record.Command, NAME_None, Record.Command->GetLabel());
			bAddedCommands = true;
		}
	}

	return bAddedCommands;
}

FVirtualShadowMapVisualizationMenuCommands::TCommandConstIterator FVirtualShadowMapVisualizationMenuCommands::CreateCommandConstIterator() const
{
	return CommandMap.CreateConstIterator();
}

void FVirtualShadowMapVisualizationMenuCommands::RegisterCommands()
{
	BuildCommandMap();
}

void FVirtualShadowMapVisualizationMenuCommands::BindCommands(FUICommandList& CommandList, const TSharedPtr<FEditorViewportClient>& Client) const
{
	// Map Virtual shadow map visualization mode actions
	for (FVirtualShadowMapVisualizationMenuCommands::TCommandConstIterator It = FVirtualShadowMapVisualizationMenuCommands::Get().CreateCommandConstIterator(); It; ++It)
	{
		const FVirtualShadowMapVisualizationMenuCommands::FVirtualShadowMapVisualizationRecord& Record = It.Value();
		CommandList.MapAction(
			Record.Command,
			FExecuteAction::CreateStatic<const TSharedPtr<FEditorViewportClient>&>(&FVirtualShadowMapVisualizationMenuCommands::ChangeVirtualShadowMapVisualizationMode, Client, Record.Name),
			FCanExecuteAction(),
			FIsActionChecked::CreateStatic<const TSharedPtr<FEditorViewportClient>&>(&FVirtualShadowMapVisualizationMenuCommands::IsVirtualShadowMapVisualizationModeSelected, Client, Record.Name)
		);
	}
}

void FVirtualShadowMapVisualizationMenuCommands::ChangeVirtualShadowMapVisualizationMode(const TSharedPtr<FEditorViewportClient>& Client, FName InName)
{
	check(Client.IsValid());
	Client->ChangeVirtualShadowMapVisualizationMode(InName);
}

bool FVirtualShadowMapVisualizationMenuCommands::IsVirtualShadowMapVisualizationModeSelected(const TSharedPtr<FEditorViewportClient>& Client, FName InName)
{
	check(Client.IsValid());
	return Client->IsVirtualShadowMapVisualizationModeSelected(InName);
}

#undef LOCTEXT_NAMESPACE