/*
 * Deskflow -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2004 Chris Schoeneman
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 *
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "base/IEventQueueBuffer.h"
#include "common/stdvector.h"
#include "mt/Mutex.h"

#if X_DISPLAY_MISSING
#error X11 is required to build deskflow
#else
#include <X11/Xlib.h>
#endif

class IEventQueue;

//! Event queue buffer for X11
class XWindowsEventQueueBuffer : public IEventQueueBuffer
{
public:
  XWindowsEventQueueBuffer(Display *, Window, IEventQueue *events);
  XWindowsEventQueueBuffer(XWindowsEventQueueBuffer const &) = delete;
  XWindowsEventQueueBuffer(XWindowsEventQueueBuffer &&) = delete;
  virtual ~XWindowsEventQueueBuffer();

  XWindowsEventQueueBuffer &operator=(XWindowsEventQueueBuffer const &) = delete;
  XWindowsEventQueueBuffer &operator=(XWindowsEventQueueBuffer &&) = delete;

  // IEventQueueBuffer overrides
  virtual void init()
  {
  }
  virtual void waitForEvent(double timeout);
  virtual Type getEvent(Event &event, UInt32 &dataID);
  virtual bool addEvent(UInt32 dataID);
  virtual bool isEmpty() const;
  virtual EventQueueTimer *newTimer(double duration, bool oneShot) const;
  virtual void deleteTimer(EventQueueTimer *) const;

private:
  void flush();

  int getPendingCountLocked();

private:
  using EventList = std::vector<XEvent>;

  Mutex m_mutex;
  Display *m_display;
  Window m_window;
  Atom m_userEvent;
  XEvent m_event;
  EventList m_postedEvents;
  bool m_waiting;
  int m_pipefd[2];
  IEventQueue *m_events;
};
