/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 Header:       FGEngine.h
 Author:       Jon S. Berndt
 Date started: 01/21/99

 ------------- Copyright (C) 1999  Jon S. Berndt (jsb@hal-pc.org) -------------

 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., 59 Temple
 Place - Suite 330, Boston, MA  02111-1307, USA.

 Further information about the GNU General Public License can also be found on
 the world wide web at http://www.gnu.org.

FUNCTIONAL DESCRIPTION
--------------------------------------------------------------------------------

Based on Flightgear code, which is based on LaRCSim. This class simulates
a generic engine.

HISTORY
--------------------------------------------------------------------------------
01/21/99   JSB   Created

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
SENTRY
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifndef FGENGINE_H
#define FGENGINE_H

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifdef FGFS
#  include <simgear/compiler.h>
#  include STL_STRING
   SG_USING_STD(string);
#  ifdef FG_HAVE_STD_INCLUDES
#    include <vector>
#  else
#    include <vector.h>
#  endif
#else
#  include <vector>
#  include <string>
#endif

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
DEFINITIONS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#define ID_ENGINE "$Id$"

using std::string;

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
FORWARD DECLARATIONS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

class FGFDMExec;
class FGState;
class FGAtmosphere;
class FGFCS;
class FGAircraft;
class FGTranslation;
class FGRotation;
class FGPropulsion;
class FGPosition;
class FGAuxiliary;
class FGOutput;

using std::vector;

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
COMMENTS, REFERENCES, and NOTES [use "class documentation" below for API docs]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS DOCUMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

/** Base class for all engines.
    This base class contains methods and members common to all engines, such as
    logic to drain fuel from the appropriate tank, etc.
    @author Jon S. Berndt
    @version $Id$ 
*/

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS DECLARATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

class FGEngine {
public:
  FGEngine(FGFDMExec* exec);
  virtual ~FGEngine();

  enum EngineType {etUnknown, etRocket, etPiston, etTurboProp, etTurboJet, etTurboShaft};

  virtual float  GetThrottleMin(void) { return MinThrottle; }
  virtual float  GetThrottleMax(void) { return MaxThrottle; }
  float  GetThrottle(void) { return Throttle; }
  float  GetThrust(void) { return Thrust; }
  bool   GetStarved(void) { return Starved; }
  bool   GetFlameout(void) { return Flameout; }
  bool   GetRunning(void) { return Running; }
  int    GetType(void) { return Type; }
  string GetName(void) { return Name; }

  void SetStarved(bool tt) {Starved = tt;}
  void SetStarved(void)    {Starved = true;}

  void SetRunning(bool bb) { Running=bb; }
  void SetName(string name) {Name = name;}
  void AddFeedTank(int tkID);

  /** Calculates the thrust of the engine, and other engine functions.
      @param PowerRequired this is the power required to run the thrusting device
             such as a propeller. This resisting effect must be provided to the 
             engine model.
      @return Thrust in pounds */
  virtual float Calculate(float PowerRequired) {return 0.0;};

  /** Reduces the fuel in the active tanks by the amount required.
      This function should be called from within the
      derived class' Calculate() function before any other calculations are
      done. This base class method removes fuel from the fuel tanks as
      appropriate, and sets the starved flag if necessary. */
  void ConsumeFuel(void);

  /** The fuel need is calculated based on power levels and flow rate for that
      power level. It is also turned from a rate into an actual amount (pounds)
      by multiplying it by the delta T and the rate.
      @return Total fuel requirement for this engine in pounds. */
  float CalcFuelNeed(void);

  /** The oxidizer need is calculated based on power levels and flow rate for that
      power level. It is also turned from a rate into an actual amount (pounds)
      by multiplying it by the delta T and the rate.
      @return Total oxidizer requirement for this engine in pounds. */
  float CalcOxidizerNeed(void);

  /// Sets engine placement information
  void SetPlacement(float x, float y, float z, float pitch, float yaw);

  virtual float GetPowerAvailable(void) {return 0.0;};

  bool GetTrimMode(void) {return TrimMode;}
  void SetTrimMode(bool state) {TrimMode = state;}

protected:
  string Name;
  EngineType Type;
  float X, Y, Z;
  float EnginePitch;
  float EngineYaw;
  float SLFuelFlowMax;
  float SLOxiFlowMax;
  float MaxThrottle;
  float MinThrottle;

  float Thrust;
  float Throttle;
  float FuelNeed, OxidizerNeed;
  bool  Starved;
  bool  Flameout;
  bool  Running;
  float PctPower;
  int   EngineNumber;
  bool  TrimMode;

  FGFDMExec*      FDMExec;
  FGState*        State;
  FGAtmosphere*   Atmosphere;
  FGFCS*          FCS;
  FGPropulsion*   Propulsion;
  FGAircraft*     Aircraft;
  FGTranslation*  Translation;
  FGRotation*     Rotation;
  FGPosition*     Position;
  FGAuxiliary*    Auxiliary;
  FGOutput*       Output;

  vector <int> SourceTanks;
  void Debug(void);
};

#include "FGState.h"
#include "FGFDMExec.h"
#include "FGAtmosphere.h"
#include "FGFCS.h"
#include "FGAircraft.h"
#include "FGTranslation.h"
#include "FGRotation.h"
#include "FGPropulsion.h"
#include "FGPosition.h"
#include "FGAuxiliary.h"
#include "FGOutput.h"
#include "FGDefs.h"

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#endif