// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "Widgets/SCompoundWidget.h"

class FAssetData;
class IPersonaPreviewScene;
class UBlendProfile;
struct FSelectedSocketInfo;

// Called when a bone is selected
DECLARE_MULTICAST_DELEGATE_OneParam(FOnObjectSelectedMulticast, UObject* /* InObject */);

// Called when an object is selected
typedef FOnObjectSelectedMulticast::FDelegate FOnObjectSelected;

/** Init params for a skeleton tree widget */
struct FSkeletonTreeArgs
{
	FSkeletonTreeArgs(FSimpleMulticastDelegate& InOnPostUndo)
		: OnPostUndo(InOnPostUndo)
	{}

	/** Multicast delegate the tree will register with for undo messages */
	FSimpleMulticastDelegate& OnPostUndo;

	/** Delegate called by the tree when a socket is selected */
	FOnObjectSelected OnObjectSelected;

	/** Optional preview scene that we can pair with */
	TSharedPtr<class IPersonaPreviewScene> PreviewScene;
};

/** Interface used to deal with skeleton editing UI */
class SKELETONEDITOR_API ISkeletonTree : public SCompoundWidget
{
public:
	struct Columns
{
		static const FName Name;
		static const FName Retargeting;
		static const FName BlendProfile;
};

	/** Get editable skeleton that this widget is editing */
	virtual TSharedRef<class IEditableSkeleton> GetEditableSkeleton() const = 0;

	/** Get preview scene that this widget is editing */
	virtual TSharedPtr<class IPersonaPreviewScene> GetPreviewScene() const = 0;

	/** Set the skeletal mesh we optionally work with */
	virtual void SetSkeletalMesh(class USkeletalMesh* NewSkeletalMesh) = 0;

	/** Set the selected socket */
	virtual void SetSelectedSocket(const struct FSelectedSocketInfo& InSocketInfo) = 0;

	/** Set the selected bone */
	virtual void SetSelectedBone(const FName& InBoneName) = 0;

	/** Deselect everything that is currently selected */
	virtual void DeselectAll() = 0;

	/** Duplicate the socket and select it */
	virtual void DuplicateAndSelectSocket(const FSelectedSocketInfo& SocketInfoToDuplicate, const FName& NewParentBoneName = FName()) = 0;

	/** Registers a delegate to be called when the selected object is changed */
	virtual void RegisterOnObjectSelected(const FOnObjectSelected& Delegate) = 0;

	/** Unregisters a delegate to be called when the selected object is changed */
	virtual void UnregisterOnObjectSelected(SWidget* Widget) = 0;

	/** Gets the currently selected blend profile */
	virtual UBlendProfile* GetSelectedBlendProfile() = 0;

	/** Attached the supplied assets to the tree to the specified attach item (bone/socket) */
	virtual void AttachAssets(const TSharedRef<class ISkeletonTreeItem>& TargetItem, const TArray<FAssetData>& AssetData) = 0;
};