#ifndef STK_WHISTLE_H
#define STK_WHISTLE_H

#include "Instrmnt.h"
#include "Sphere.h"
#include "Vector3D.h"
#include "Noise.h"
#include "SineWave.h"
#include "OnePole.h"
#include "Envelope.h"

namespace stk {

/***************************************************/
/*! \class Whistle
    \brief STK police/referee whistle instrument class.

    This class implements a hybrid physical/spectral
    model of a police whistle (a la Cook).

    Control Change Numbers: 
       - Noise Gain = 4
       - Fipple Modulation Frequency = 11
       - Fipple Modulation Gain = 1
       - Blowing Frequency Modulation = 2
       - Volume = 128

    by Perry R. Cook  1995--2019.
*/
/***************************************************/

class Whistle : public Instrmnt
{
public:
  //! Class constructor.
  /*!
    An StkError will be thrown if the rawwave path is incorrectly set.
  */
  Whistle( void );

  //! Class destructor.
  ~Whistle( void );

  //! Reset and clear all internal state.
  void clear( void );

  //! Set instrument parameters for a particular frequency.
  void setFrequency( StkFloat frequency );

  //! Apply breath velocity to instrument with given amplitude and rate of increase.
  void startBlowing( StkFloat amplitude, StkFloat rate );

  //! Decrease breath velocity with given rate of decrease.
  void stopBlowing( StkFloat rate );

  //! Start a note with the given frequency and amplitude.
  void noteOn( StkFloat frequency, StkFloat amplitude );

  //! Stop a note with the given amplitude (speed of decay).
  void noteOff( StkFloat amplitude );

  //! Perform the control change specified by \e number and \e value (0.0 - 128.0).
  void controlChange( int number, StkFloat value );

  //! Compute and return one output sample.
  StkFloat tick( unsigned int channel = 0 );

  //! Fill a channel of the StkFrames object with computed outputs.
  /*!
    The \c channel argument must be less than the number of
    channels in the StkFrames argument (the first channel is specified
    by 0).  However, range checking is only performed if _STK_DEBUG_
    is defined during compilation, in which case an out-of-range value
    will trigger an StkError exception.
  */
  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );

protected:

	Vector3D *tempVectorP_;
  Vector3D tempVector_;
  OnePole onepole_;
  Noise noise_;
	Envelope envelope_;
  Sphere can_;           // Declare a Spherical "can".
  Sphere pea_, bumper_;  // One spherical "pea", and a spherical "bumper".

  SineWave sine_;

  StkFloat baseFrequency_;
  StkFloat noiseGain_;
  StkFloat fippleFreqMod_;
	StkFloat fippleGainMod_;
	StkFloat blowFreqMod_;
	StkFloat tickSize_;
	StkFloat canLoss_;
	int subSample_, subSampCount_;
};

inline StkFrames& Whistle :: tick( StkFrames& frames, unsigned int channel )
{
  unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
  if ( channel > frames.channels() - nChannels ) {
    oStream_ << "Whistle::tick(): channel and StkFrames arguments are incompatible!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif

  StkFloat *samples = &frames[channel];
  unsigned int j, hop = frames.channels() - nChannels;
  if ( nChannels == 1 ) {
    for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
      *samples++ = tick();
  }
  else {
    for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
      *samples++ = tick();
      for ( j=1; j<nChannels; j++ )
        *samples++ = lastFrame_[j];
    }
  }

  return frames;
}

} // stk namespace
#endif
