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

#pragma once

#include "CoreMinimal.h"
#include "SlateFwd.h"
#include "Stats/Stats.h"
#include "Misc/Attribute.h"
#include "Animation/CurveSequence.h"
#include "Layout/Visibility.h"
#include "Widgets/SWidget.h"
#include "Editor/UnrealEdTypes.h"
#include "Application/ThrottleManager.h"
#include "EditorViewportLayout.h"
#include "TickableEditorObject.h"
#include "SEditorViewport.h"

class FAssetEditorViewportLayout;
class SAssetEditorViewportsOverlay;
class SWindow;
class SAssetEditorViewport;

/** Arguments for constructing a viewport */
struct FAssetEditorViewportConstructionArgs
{
    FAssetEditorViewportConstructionArgs()
        : ViewportType(LVT_Perspective), bRealtime(false)
    {}

    /** The viewport's parent layout */
    TSharedPtr<FAssetEditorViewportLayout> ParentLayout;
    /** The viewport's desired type */
    ELevelViewportType ViewportType;
    /** Whether the viewport should default to realtime */
    bool bRealtime;
    /** A config key for loading/saving settings for the viewport */
    FName ConfigKey;
    /** Widget enabled attribute */
    TAttribute<bool> IsEnabled;
};

namespace EditorViewportConfigurationNames
{
static FName TwoPanesHoriz("TwoPanesHoriz");
static FName TwoPanesVert("TwoPanesVert");
static FName ThreePanesLeft("ThreePanesLeft");
static FName ThreePanesRight("ThreePanesRight");
static FName ThreePanesTop("ThreePanesTop");
static FName ThreePanesBottom("ThreePanesBottom");
static FName FourPanesLeft("FourPanesLeft");
static FName FourPanesRight("FourPanesRight");
static FName FourPanesTop("FourPanesTop");
static FName FourPanesBottom("FourPanesBottom");
static FName FourPanes2x2("FourPanes2x2");
static FName OnePane("OnePane");
}  // namespace EditorViewportConfigurationNames
/**
 * Base class for viewport layout configurations
 * Handles maximizing and restoring well as visibility of specific viewports.
 */
class UNREALED_API FAssetEditorViewportLayout: public TSharedFromThis<FAssetEditorViewportLayout>
    , public FEditorViewportLayout
    , public FTickableEditorObject
{
public:
    /**
     * Constructor
     */
    FAssetEditorViewportLayout();

    /**
     * Destructor
     */
    virtual ~FAssetEditorViewportLayout();

    /** Create an instance of a custom viewport from the specified viewport type name */
    TSharedRef<IEditorViewportLayoutEntity> FactoryViewport(TFunction<TSharedRef<SEditorViewport>(void)>& Func, FName InTypeName, const FAssetEditorViewportConstructionArgs& ConstructionArgs) const;

    /** FTickableEditorObject interface */
    virtual void Tick(float DeltaTime) override {}
    virtual bool IsTickable() const override { return false; }
    virtual TStatId GetStatId() const override { return TStatId(); }

    /**
     * Builds a viewport layout and returns the widget containing the layout
     *
     * @param InParentDockTab		The parent dock tab widget of this viewport configuration
     * @param InParentTab			The parent tab object
     * @param LayoutString			The layout string loaded from file to custom build the layout with
     */
    TSharedRef<SWidget> BuildViewportLayout(TFunction<TSharedRef<SEditorViewport>(void)>& Func, TSharedPtr<SDockTab> InParentDockTab, TSharedPtr<class FViewportTabContent> InParentTab, const FString& LayoutString);

    /** Returns the parent tab content object */
    TWeakPtr<class FViewportTabContent> GetParentTabContent() const { return ParentTabContent; }

    /** Generates a layout string for persisting settings for this layout based on the runtime type of layout */
    FString GetTypeSpecificLayoutString(const FString& LayoutString) const;

    /**
     * Overridden in derived classes to set up custom layouts
     *
     * @param LayoutString		The layout string loaded from a file
     * @return The base widget representing the layout.  Usually a splitter
     */
    virtual TSharedRef<SWidget> MakeViewportLayout(TFunction<TSharedRef<SEditorViewport>(void)>& Func, const FString& LayoutString) = 0;

    /** The overlay widget that handles what viewports should be on top (non-maximized or maximized) */
    TWeakPtr<class SAssetEditorViewportsOverlay> ViewportsOverlayPtr;

    /** The parent tab content object where this layout resides */
    TWeakPtr<class FViewportTabContent> ParentTabContent;

    /** The parent tab where this layout resides */
    TWeakPtr<SDockTab> ParentTab;
};