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

#pragma once

#include "CoreMinimal.h"
#include "Editor/UnrealEdTypes.h"
#include "LevelEditorMenuContext.h"

class FExtender;
class UToolMenu;
class UTypedElementSelectionSet;
struct FToolMenuContext;
class SLevelEditor;
class SWidget;
struct FToolMenuSection;

/**
 * Context menu construction class 
 */
class LEVELEDITOR_API FLevelEditorContextMenu
{

public:

	/**
	 * Summons the level viewport context menu
	 * @param	LevelEditor		The level editor using this menu.
	 * @param	ContextType		The context we should use to specialize this menu
	 * @param	HitProxyActor	The hitproxy actor in the case the ContextType is Viewport
	 */
	static void SummonMenu( const TSharedRef< class SLevelEditor >& LevelEditor, ELevelEditorMenuContext ContextType, const FTypedElementHandle& HitProxyElement = FTypedElementHandle());

	/**
	 * Summons the viewport view option menu
	 * @param LevelEditor		The level editor using this menu.
	 */
	static void SummonViewOptionMenu( const TSharedRef< class SLevelEditor >& LevelEditor, const ELevelViewportType ViewOption );

	/**
	 * Creates a widget for the context menu that can be inserted into a pop-up window
	 *
	 * @param	LevelEditor		The level editor using this menu.
	 * @param	ContextType		The context we should use to specialize this menu
	 * @param	Extender		Allows extension of this menu based on context.
	 * @param	HitProxyActor	The hitproxy actor in the case the ContextType is Viewport
	 * @return	Widget for this context menu
	 */
	static TSharedRef< SWidget > BuildMenuWidget(TWeakPtr< ILevelEditor > LevelEditor, ELevelEditorMenuContext ContextType, TSharedPtr<FExtender> Extender = TSharedPtr<FExtender>(), const FTypedElementHandle& HitProxyElement = FTypedElementHandle());

	/**
	 * Populates the specified menu builder for the context menu that can be inserted into a pop-up window
	 *
	 * @param	Menu			The menu to fill
	 * @param	LevelEditor		The level editor using this menu.
	 * @param	ContextType		The context we should use to specialize this menu
	 * @param	Extender		Allows extension of this menu based on context.
	 * @param	HitProxyActor	The hitproxy actor in the case the ContextType is Viewport
	 */
	static UToolMenu* GenerateMenu(TWeakPtr< ILevelEditor > LevelEditor, ELevelEditorMenuContext ContextType, TSharedPtr<FExtender> Extender = TSharedPtr<FExtender>(), const FTypedElementHandle& HitProxyElement = FTypedElementHandle());

	/* Adds required information to Context for build menu based on current selection */
	static FName InitMenuContext(FToolMenuContext& Context, TWeakPtr<ILevelEditor> LevelEditor, ELevelEditorMenuContext ContextType, const FTypedElementHandle& HitProxyElement = FTypedElementHandle());

	/* Returns name of menu to display based on current selection */
	static FName GetContextMenuName(ELevelEditorMenuContext ContextType, const UTypedElementSelectionSet* InSelectionSet);

	/* Returns a user-readable title for the menu to display; the title can be displayed in UI like the menu bar */
	static FText GetContextMenuTitle(ELevelEditorMenuContext ContextType, const UTypedElementSelectionSet* InSelectionSet);

	/* Returns a user-readable tooltip describing the menu to display */
	static FText GetContextMenuToolTip(ELevelEditorMenuContext ContextType, const UTypedElementSelectionSet* InSelectionSet);

	static void RegisterComponentContextMenu();
	static void RegisterActorContextMenu();
	static void RegisterElementContextMenu();
	static void RegisterSceneOutlinerContextMenu();
	static void RegisterMenuBarEmptyContextMenu();
	static void RegisterEmptySelectionContextMenu();

	static void AddPlayFromHereSubMenu(FToolMenuSection& Section);

	/**
	 * Builds the actor group menu
	 *
	 * @param Menu		The menu to add items to.
	 * @param SelectedActorInfo	Information about the selected actors.
	 */
	static void BuildGroupMenu(FToolMenuSection& Section, const struct FSelectedActorInfo& SelectedActorInfo);
};