// -*- C++ -*-
// $Id: gpx.h,v 1.1 2009-07-05 21:14:56 robertl Exp $
//------------------------------------------------------------------------
//
//  Copyright (C) 2009  S. Khai Mong <khai@mangrai.com>.
//
//  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 GPX_H
#define GPX_H

#include <QDateTime>             // for QDateTime
#include <QList>                 // for QList
#include <QString>               // for QString
#include <QtGlobal>              // for foreach
#include "latlng.h"              // for LatLng


//------------------------------------------------------------------------
class GpxItem
{
public:
  GpxItem(): visible(true) {}
  GpxItem(bool visible): visible(visible) {}

  void setVisible(bool b)
  {
    visible = b;
  }

  bool getVisible() const
  {
    return visible;
  }

protected:
  bool visible;
};

//------------------------------------------------------------------------
class GpxRoutePoint: public GpxItem
{
public:
  GpxRoutePoint():  location(LatLng()), name(QString())
  {
  }

  void setLocation(const LatLng& pt)
  {
    location = pt;
  }

  LatLng getLocation() const
  {
    return location;
  }

  void setName(const QString& s)
  {
    name = s;
  }

  QString getName() const
  {
    return name;
  }

private:
  LatLng location;
  QString name;
};

//------------------------------------------------------------------------
class GpxRoute: public GpxItem
{
public:
  GpxRoute(): name(QString()), cachedLength(-1) {}

  GpxRoute(const GpxRoute& c)
    :GpxItem(c.visible),
     name(c.name), cachedLength(c.cachedLength)
  {
    routePoints.clear();
    foreach (GpxRoutePoint sg, c.routePoints) {
      routePoints << sg;
    }
  }
  GpxRoute& operator = (const GpxRoute& c)
  {
    visible = c.visible;
    name = c.name;
    cachedLength = c.cachedLength;
    routePoints.clear();
    foreach (GpxRoutePoint sg, c.routePoints) {
      routePoints << sg;
    }
    return *this;
  }

  double length() const
  {
    if (cachedLength >=0.0) {
      return cachedLength;
    }
    LatLng prevPt;
    bool first = true;
    double dist = 0.0;
    foreach (GpxRoutePoint pt, routePoints) {
      if (first) {
        prevPt = pt.getLocation();
        first = false;
      } else {
        LatLng thisPt = pt.getLocation();
        dist += prevPt.haversineDistance(thisPt);
        prevPt = thisPt;
      }
    }
    auto* dptr = (double*)(&cachedLength);  // big cheat
    *dptr = dist;
    return cachedLength;
  }

  void setName(const QString& s)
  {
    name = s;
  }

  QString getName() const
  {
    return name;
  }

  void clear()
  {
    routePoints.clear();
  }

  void addPoint(const GpxRoutePoint& pt)
  {
    routePoints << pt;
  }
  const QList<GpxRoutePoint>& getRoutePoints() const
  {
    return routePoints;
  }

private:
  QString name;
  QList <GpxRoutePoint> routePoints;
  double cachedLength;
};

//------------------------------------------------------------------------
class GpxTrackPoint: public GpxItem
{
public:
  GpxTrackPoint():  location(LatLng()), elevation(0), dateTime(QDateTime())
  {
  }

  void setLocation(const LatLng& pt)
  {
    location = pt;
  }

  LatLng getLocation() const
  {
    return location;
  }

  void setElevation(double e)
  {
    elevation = e;
  }

  double getElevation() const
  {
    return elevation;
  }

  void setDateTime(const QDateTime& dt)
  {
    dateTime = dt;
  }

  QDateTime getDateTime() const
  {
    return dateTime;
  }

private:
  LatLng location;
  double  elevation;
  QDateTime dateTime;
};

//------------------------------------------------------------------------
class GpxTrackSegment: public GpxItem
{
public:
  GpxTrackSegment() {}

  GpxTrackSegment(const GpxTrackSegment& c): GpxItem(c.visible)
  {
    trackPoints.clear();
    foreach (GpxTrackPoint pt, c.trackPoints) {
      trackPoints << pt;
    }
  }
  GpxTrackSegment& operator = (const GpxTrackSegment& c)
  {
    visible = c.visible;
    trackPoints.clear();
    foreach (GpxTrackPoint pt, c.trackPoints) {
      trackPoints << pt;
    }
    return *this;
  }
  void addPoint(const GpxTrackPoint& pt)
  {
    trackPoints << pt;
  }
  void clear()
  {
    trackPoints.clear();
  }

  const QList<GpxTrackPoint>& getTrackPoints() const
  {
    return trackPoints;
  }

private:
  QList <GpxTrackPoint> trackPoints;
};
//------------------------------------------------------------------------
class GpxTrack: public GpxItem
{
public:
  GpxTrack():  number(1), name(QString()), comment(QString()), description(QString()), cachedLength(-1.0) {}

  GpxTrack(const GpxTrack& c)
    :GpxItem(c.visible),
     number(c.number),
     name(c.name),
     comment(c.comment),
     description(c.description),
     cachedLength(c.cachedLength)
  {
    trackSegments.clear();
    foreach (GpxTrackSegment sg, c.trackSegments) {
      trackSegments << sg;
    }
  }
  GpxTrack& operator = (const GpxTrack& c)
  {
    visible = c.visible;
    number = c.number;
    name = c.name;
    comment = c.comment;
    description = c.description;
    cachedLength = c.cachedLength;
    trackSegments.clear();
    foreach (GpxTrackSegment sg, c.trackSegments) {
      trackSegments << sg;
    }
    return *this;
  }

  void setNumber(int n)
  {
    number = n;
  }

  int getNumber() const
  {
    return number;
  }

  void setName(const QString& s)
  {
    name = s;
  }

  QString getName() const
  {
    return name;
  }

  void setComment(const QString& s)
  {
    comment = s;
  }

  QString getComment() const
  {
    return comment;
  }

  void setDescription(const QString& s)
  {
    description = s;
  }

  QString getDescription() const
  {
    return description;
  }

  void clear()
  {
    trackSegments.clear();
  }

  void addSegment(const GpxTrackSegment& seg)
  {
    trackSegments << seg;
  }
  const QList<GpxTrackSegment>& getTrackSegments() const
  {
    return trackSegments;
  }

  double length() const
  {
    if (cachedLength >=0.0) {
      return cachedLength;
    }
    LatLng prevPt;
    bool first = true;
    double dist = 0.0;
    foreach (GpxTrackSegment seg, trackSegments) {
      foreach (GpxTrackPoint pt, seg.getTrackPoints()) {
        if (first) {
          prevPt = pt.getLocation();
          first = false;
        } else {
          LatLng thisPt = pt.getLocation();
          dist += prevPt.haversineDistance(thisPt);
          prevPt = thisPt;
        }
      }
    }
    auto* dptr = (double*)(&cachedLength);  // big cheat
    *dptr = dist;
    return cachedLength;
  }

private:
  int     number;
  QString name;
  QString comment;
  QString description;
  QList <GpxTrackSegment> trackSegments;
  double cachedLength;
};

//------------------------------------------------------------------------
class GpxWaypoint: public GpxItem
{
public:
  GpxWaypoint(): 
    location_(LatLng(0, 0)),
    elevation_(-1.0E-100),
    name_(QString()),
    comment_(QString()),
    description_(QString()),
    symbol_(QString())
  {}

  void setLocation(const LatLng& pt)
  {
    location_ = pt;
  }

  LatLng getLocation() const
  {
    return location_;
  }

  void setElevation(double e)
  {
    elevation_ = e;
  }

  double getElevation() const
  {
    return elevation_;
  }

  void setName(const QString& s)
  {
    name_ = s;
  }

  QString getName() const
  {
    return name_;
  }

  void setComment(const QString& s)
  {
    comment_ = s;
  }

  QString getComment() const
  {
    return comment_;
  }

  void setDescription(const QString& s)
  {
    description_ = s;
  }

  QString getDescription() const
  {
    return description_;
  }

  void setSymbol(const QString& s)
  {
    symbol_ = s;
  }

  QString getSymbol() const
  {
    return symbol_;
  }

private:
  LatLng location_;
  double  elevation_;
  QString name_;
  QString comment_;
  QString description_;
  QString symbol_;
};

//------------------------------------------------------------------------
class Gpx
{
public:
  Gpx() {}
  bool read(const QString& fileName);

  QList <GpxWaypoint>& getWaypoints()
  {
    return wayPoints;
  } // nonconst

  QList <GpxTrack>&    getTracks()
  {
    return tracks;
  }

  QList <GpxRoute>&    getRoutes()
  {
    return routes;
  }

  const QList <GpxWaypoint>& getWaypoints() const
  {
    return wayPoints;
  }

  const QList <GpxTrack>& getTracks()       const
  {
    return tracks;
  }

  const QList <GpxRoute>& getRoutes()       const
  {
    return routes;
  }

private:
  QList <GpxWaypoint> wayPoints;
  QList <GpxTrack>    tracks;
  QList <GpxRoute>    routes;
};


#endif
