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

#pragma once

#include "CoreMinimal.h"
#include "Misc/NotifyHook.h"
#include "Layout/Visibility.h"
#include "Input/Reply.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/Views/STableViewBase.h"
#include "Widgets/Views/STableRow.h"
#include "Widgets/Input/SSpinBox.h"
#include "IDetailsView.h"
#include "ISocketManager.h"

class IStaticMeshEditor;
class UStaticMesh;
class UStaticMeshSocket;
struct FPropertyChangedEvent;
struct SocketListItem;

class SSocketManager: public ISocketManager
    , public FNotifyHook
{
public:
    SLATE_BEGIN_ARGS(SSocketManager): _StaticMeshEditorPtr() {}
    SLATE_ARGUMENT(TSharedPtr<IStaticMeshEditor>, StaticMeshEditorPtr)
    SLATE_EVENT(FSimpleDelegate, OnSocketSelectionChanged)
    SLATE_END_ARGS()

    virtual void Construct(const FArguments& InArgs);

    virtual ~SSocketManager();

    // ISocketManager interface
    virtual UStaticMeshSocket* GetSelectedSocket() const override;
    virtual void SetSelectedSocket(UStaticMeshSocket* InSelectedSocket) override;
    virtual void DeleteSelectedSocket() override;
    virtual void DuplicateSelectedSocket() override;
    virtual void RequestRenameSelectedSocket() override;
    virtual void UpdateStaticMesh() override;
    // End of ISocketManager

    /**
     *	Checks for a duplicate socket using the name for comparison.
     *
     *	@param InSocketName			The name to compare.
     *
     *	@return						TRUE if another socket already exists with that name.
     */
    bool CheckForDuplicateSocket(const FString& InSocketName);

private:
    /** Creates a widget from the list item. */
    TSharedRef<ITableRow> MakeWidgetFromOption(TSharedPtr<struct SocketListItem> InItem, const TSharedRef<STableViewBase>& OwnerTable);

    /**	Creates a socket with a specified name. */
    void CreateSocket();

    /** Refreshes the socket list. */
    void RefreshSocketList();

    /** Gets the visibility of the select a socket message */
    EVisibility GetSelectSocketMessageVisibility() const;

    /**
     *	Updates the details to the selected socket.
     *
     *	@param InSocket				The newly selected socket.
     */
    void SocketSelectionChanged(UStaticMeshSocket* InSocket);

    /** Callback for the list view when an item is selected. */
    void SocketSelectionChanged_Execute(TSharedPtr<SocketListItem> InItem, ESelectInfo::Type SelectInfo);

    /** Callback for the Create Socket button. */
    FReply CreateSocket_Execute();

    FText GetSocketHeaderText() const;

    /** Callback for when the socket name textbox is changed, verifies the name is not a duplicate. */
    void SocketName_TextChanged(const FText& InText);

    /** Callback to retrieve the context menu for the list view */
    TSharedPtr<SWidget> OnContextMenuOpening();

    /** FNotifyHook interface */
    virtual void NotifyPostChange(const FPropertyChangedEvent& PropertyChangedEvent, FProperty* PropertyThatChanged) override;

    /** Post undo */
    void PostUndo();

    /** Callback when an item is scrolled into view, handling calls to rename items */
    void OnItemScrolledIntoView(TSharedPtr<SocketListItem> InItem, const TSharedPtr<ITableRow>& InWidget);

private:
    /** Add a property change listener to each socket. */
    void AddPropertyChangeListenerToSockets();

    /** Remove the property change listener from the sockets. */
    void RemovePropertyChangeListenerFromSockets();

    /** Called when a socket property has changed. */
    void OnSocketPropertyChanged(const UStaticMeshSocket* Socket, const FProperty* ChangedProperty);

    /** Called when socket selection changes */
    FSimpleDelegate OnSocketSelectionChanged;

    /** Pointer back to the static mesh editor, used for */
    TWeakPtr<IStaticMeshEditor> StaticMeshEditorPtr;

    /** Details panel for the selected socket. */
    TSharedPtr<class IDetailsView> SocketDetailsView;

    /** List of sockets for for the associated static mesh or anim set. */
    TArray<TSharedPtr<SocketListItem>> SocketList;

    /** Listview for displaying the sockets. */
    TSharedPtr<SListView<TSharedPtr<SocketListItem>>> SocketListView;

    /** Helper variable for rotating in world space. */
    FVector WorldSpaceRotation;

    /** The static mesh being edited. */
    TWeakObjectPtr<UStaticMesh> StaticMesh;

    /** Widgets for the World Space Rotation */
    TSharedPtr<SSpinBox<float>> PitchRotation;
    TSharedPtr<SSpinBox<float>> YawRotation;
    TSharedPtr<SSpinBox<float>> RollRotation;

    /** Points to an item that is being requested to be renamed */
    TWeakPtr<SocketListItem> DeferredRenameRequest;
};