/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __nsNativeMenuService_h__
#define __nsNativeMenuService_h__

#include "mozilla/Attributes.h"
#include "nsCOMPtr.h"
#include "nsDataHashtable.h"
#include "nsINativeMenuService.h"
#include "nsTArray.h"

#include <gdk/gdk.h>
#include <gio/gio.h>
#include <gtk/gtk.h>

class nsMenuBar;

/*
 * The main native menu service singleton. nsWebShellWindow calls in to this when
 * a new top level window is created.
 *
 * Menubars are owned by their nsWindow. This service holds a weak reference to
 * each menubar for the purpose of re-registering them with the shell if it
 * needs to. The menubar is responsible for notifying the service when the last
 * reference to it is dropped.
 */
class nsNativeMenuService final : public nsINativeMenuService {
public:
    NS_DECL_ISUPPORTS

    NS_IMETHOD CreateNativeMenuBar(nsIWidget* aParent, nsIContent* aMenuBarNode) override;

    // Returns the singleton addref'd for the service manager
    static already_AddRefed<nsNativeMenuService> GetInstanceForServiceManager();

    // Returns the singleton without increasing the reference count
    static nsNativeMenuService* GetSingleton();

    // Called by a menubar when it is deleted
    void NotifyNativeMenuBarDestroyed(nsMenuBar* aMenuBar);

private:
    nsNativeMenuService();
    ~nsNativeMenuService();
    nsresult Init();

    static void EnsureInitialized();
    void SetOnline(bool aOnline);
    void RegisterNativeMenuBar(nsMenuBar* aMenuBar);
    static void name_owner_changed_cb(GObject* gobject,
                                      GParamSpec* pspec,
                                      gpointer user_data);
    static void proxy_created_cb(GObject* source_object,
                                 GAsyncResult* res,
                                 gpointer user_data);
    static void register_native_menubar_cb(GObject* source_object,
                                           GAsyncResult* res,
                                           gpointer user_data);
    static gboolean map_event_cb(GtkWidget* widget, GdkEvent* event,
                                 gpointer user_data);
    void OnNameOwnerChanged();
    void OnProxyCreated(GDBusProxy* aProxy);
    void OnNativeMenuBarRegistered(nsMenuBar* aMenuBar,
                                   bool aSuccess);
    static void PrefChangedCallback(const char* aPref, void* aClosure);
    void PrefChanged();

    GCancellable* mCreateProxyCancellable;
    GDBusProxy* mDbusProxy;
    bool mOnline;
    nsTArray<nsMenuBar* > mMenuBars;
    nsDataHashtable<nsPtrHashKey<nsMenuBar>, GCancellable*> mMenuBarRegistrationCancellables;

    static bool sShutdown;
    static nsNativeMenuService* sService;
};

#endif /* __nsNativeMenuService_h__ */