/***************************************************************************
 *
 * Project:  OpenCPN
 * Purpose:  NMEA0183 Support Classes
 * Author:   Samuel R. Blackburn, David S. Register
 *
 ***************************************************************************
 *   Copyright (C) 2010 by Samuel R. Blackburn, 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.             *
 ***************************************************************************
 *
 *   S Blackburn's original source license:                                *
 *         "You can use it any way you like."                              *
 *   More recent (2010) license statement:                                 *
 *         "It is BSD license, do with it what you will"                   *
 */

#include "nmea0183.h"
#include "hdm.hpp"

/*
** Author: Samuel R. Blackburn
** CI$: 76300,326
** Internet: sammy@sed.csc.com
**
** You can use it any way you like.
*/

HDM::HDM() {
  Mnemonic = _T("HDM");
  Empty();
}

HDM::~HDM() {
  Mnemonic.Empty();
  Empty();
}

void HDM::Empty(void) { DegreesMagnetic = 0.0; }

bool HDM::Parse(const SENTENCE& sentence) {
  /*
  ** HDM - Heading - Magnetic
  **
  **        1   2 3
  **        |   | |
  ** $--HDM,x.x,M*hh<CR><LF>
  **
  ** Field Number:
  **  1) Heading Degrees, Magnetic
  **  2) M = Magnetic
  **  3) Checksum
  */

  /*
  ** First we check the checksum...
  */

  if (sentence.IsChecksumBad(3) == TRUE) {
    SetErrorMessage(_T("Invalid Checksum"));
    return (FALSE);
  }

  DegreesMagnetic = sentence.Double(1);

  return (TRUE);
}

bool HDM::Write(SENTENCE& sentence) {
  /*
  ** Let the parent do its thing
  */

  RESPONSE::Write(sentence);

  sentence += DegreesMagnetic;
  sentence += _T("M");

  sentence.Finish();

  return (TRUE);
}

const HDM& HDM::operator=(const HDM& source) {
  DegreesMagnetic = source.DegreesMagnetic;

  return (*this);
}