/***************************************************************************
 *
 * Project:  OpenCPN
 *
 ***************************************************************************
 *   Copyright (C) 2013 by David S. Register                               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,  USA.         *
 **************************************************************************/

#ifndef __OCP_DATASTREAMINPUT_THREAD_H__
#define __OCP_DATASTREAMINPUT_THREAD_H__

#include <wx/thread.h>
#include <wx/string.h>
#include <wx/event.h>
#include <wx/arrstr.h>

#include <mutex>  // std::mutex
#include <queue>  // std::queue

#ifdef __WXMSW__
#include <windows.h>
#include <initguid.h>
#include "setupapi.h"  // presently stored in opencpn/src
#endif

#include "config.h"

#include "dsPortType.h"

#ifdef OCPN_USE_NEWSERIAL
#include "serial/serial.h"
#endif

#define OUT_QUEUE_LENGTH 20
#define MAX_OUT_QUEUE_MESSAGE_LENGTH 100

class DataStream;

template <typename T>
class atomic_queue {
public:
  size_t size() {
    std::lock_guard<std::mutex> lock(m_mutex);
    return m_queque.size();
  }

  bool empty() {
    std::lock_guard<std::mutex> lock(m_mutex);
    return m_queque.empty();
  }

  const T &front() {
    std::lock_guard<std::mutex> lock(m_mutex);
    return m_queque.front();
  }

  void push(const T &value) {
    std::lock_guard<std::mutex> lock(m_mutex);
    m_queque.push(value);
  }

  void pop() {
    std::lock_guard<std::mutex> lock(m_mutex);
    m_queque.pop();
  }

private:
  std::queue<T> m_queque;
  mutable std::mutex m_mutex;
};

/**
 * This thread manages reading the data stream from the declared serial port.
 *
 * This thread manages reading the NMEA data stream from the declared source.
 */
class OCP_DataStreamInput_Thread : public wxThread {
public:
  OCP_DataStreamInput_Thread(DataStream *Launcher, wxEvtHandler *MessageTarget,
                             const wxString &PortName,
                             const wxString &strBaudRate, dsPortType io_select);

  ~OCP_DataStreamInput_Thread(void);
  void *Entry();
  bool SetOutMsg(const wxString &msg);
  void OnExit(void);

private:
#ifdef OCPN_USE_NEWSERIAL
  serial::Serial m_serial;
  void ThreadMessage(const wxString &msg);
  bool OpenComPortPhysical(const wxString &com_name, int baud_rate);
  void CloseComPortPhysical();
  void Parse_And_Send_Posn(const char *s);
  size_t WriteComPortPhysical(char *msg);
  size_t WriteComPortPhysical(const wxString &string);
#else
  void ThreadMessage(const wxString &msg);
  void Parse_And_Send_Posn(const char *s);
  int OpenComPortPhysical(const wxString &com_name, int baud_rate);
  int CloseComPortPhysical(int fd);
  int WriteComPortPhysical(int port_descriptor, const wxString &string);
  int WriteComPortPhysical(int port_descriptor, char *msg);
  int ReadComPortPhysical(int port_descriptor, int count, unsigned char *p);
  bool CheckComPortPhysical(int port_descriptor);

  void HandleASuccessfulRead(char *buf, int nread);
  wxCriticalSection m_outCritical;
#endif
  wxEvtHandler *m_pMessageTarget;
  DataStream *m_launcher;
  wxString m_PortName;
  wxString m_FullPortName;

  dsPortType m_io_select;

  char *put_ptr;
  char *tak_ptr;

  char *rx_buffer;
  char *temp_buf;

  unsigned long error;

  int m_gps_fd;
  int m_baud;
  int m_n_timeout;

  // int                     m_takIndex;
  // int                     m_putIndex;
  // char                    *m_poutQueue[OUT_QUEUE_LENGTH];

  atomic_queue<char *> out_que;

#ifdef __WXMSW__
  HANDLE m_hSerialComm;
  bool m_nl_found;
#endif
};

#endif
