// Part of BNC, a utility for retrieving decoding and
// converting GNSS data streams from NTRIP broadcasters.
//
// Copyright (C) 2007
// German Federal Agency for Cartography and Geodesy (BKG)
// http://www.bkg.bund.de
// Czech Technical University Prague, Department of Geodesy
// http://www.fsv.cvut.cz
//
// Email: euref-ip@bkg.bund.de
//
// 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, version 2.
//
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

/* -------------------------------------------------------------------------
 * BKG NTRIP Client
 * -------------------------------------------------------------------------
 *
 * Class:      bncutils
 *
 * Purpose:    Auxiliary Functions
 *
 * Author:     L. Mervart
 *
 * Created:    30-Aug-2006
 *
 * Changes:    
 *
 * -----------------------------------------------------------------------*/

#include <iostream>
#include <ctime>
#include <math.h>

#include <QRegExp>
#include <QStringList>
#include <QDateTime>

#include "bncutils.h"
#include "bncapp.h"

using namespace std;

void expandEnvVar(QString& str) {

  QRegExp rx("(\\$\\{.+\\})");

  if (rx.indexIn(str) != -1) {
    QStringListIterator it(rx.capturedTexts());
    if (it.hasNext()) {
      QString rxStr  = it.next();
      QString envVar = rxStr.mid(2,rxStr.length()-3);
      str.replace(rxStr, qgetenv(envVar.toAscii()));
    }
  }

}

QDateTime dateAndTimeFromGPSweek(int GPSWeek, double GPSWeeks) {

  static const QDate zeroEpoch(1980, 1, 6);
 
  QDate date(zeroEpoch);
  QTime time(0,0,0,0);

  int weekDays = int(GPSWeeks) / 86400;
  date = date.addDays( GPSWeek * 7 + weekDays );
  time = time.addMSecs( int( (GPSWeeks - 86400 * weekDays) * 1e3 ) );

  return QDateTime(date,time);
}

void currentGPSWeeks(int& week, double& sec) {

  QDateTime currDateTime;
  int leapsecond = 0;

  if ( ((bncApp*) qApp)->_currentDateAndTimeGPS ) {
    currDateTime = *(((bncApp*) qApp)->_currentDateAndTimeGPS);
  }
  else {
    currDateTime = QDateTime::currentDateTime().toUTC();
    if (currDateTime.date().year() >= 2009) {
      leapsecond = 15;
    }
    else {
      leapsecond = 14;
    }
  }

  QDate     currDate = currDateTime.date();
  QTime     currTime = currDateTime.time();

  week = int( (double(currDate.toJulianDay()) - 2444244.5) / 7 );

  sec = (currDate.dayOfWeek() % 7) * 24.0 * 3600.0 + 
        currTime.hour()                   * 3600.0 + 
        currTime.minute()                 *   60.0 + 
        currTime.second()                          +
        currTime.msec()                   / 1000.0 +
        leapsecond;
}

QDateTime currentDateAndTimeGPS() {
  int    GPSWeek;
  double GPSWeeks;
  currentGPSWeeks(GPSWeek, GPSWeeks);
  return dateAndTimeFromGPSweek(GPSWeek, GPSWeeks);
}