/**
 * @author  Fabrizio Morciano <fabrizio.morciano@gmail.com>
 */

#include "ext/StrokeParametricDeformer.h"
#include "ext/NotSimmetricExpPotential.h"
//#include "ext/NotSimmetricBezierPotential.h"
//#include "ext/SquarePotential.h"

#include <sstream>

#include <tstroke.h>

using namespace std;

//-----------------------------------------------------------------------------

ToonzExt::StrokeParametricDeformer::StrokeParametricDeformer(double actionLenght,
															 double startParameter,
															 TStroke *s,
															 Potential *pot)
	: startParameter_(startParameter), actionLenght_(actionLenght), vx_(1.0), vy_(1.0), pot_(0)
{
	diff_ = 0.001;

	try {
		ref_copy_ = new TStroke(*s);
	} catch (std::bad_alloc &) {
		throw std::invalid_argument("Not possible to have a copy of stroke!!!");
	}

	assert(0.0 <= startParameter_ &&
		   startParameter_ <= 1.0);

	//double
	//  max_length = s->getLength();

	//  if( actionLenght == -1 )
	//  {
	//    assert(false && "Rispristina la vecchia gestione");
	//    actionLenght_ = 2.0 * max_length;
	//  }
	//  else
	//  {
	assert(0.0 <= actionLenght_);
	// && actionLenght_ <= max_length );

	if (0.0 > actionLenght_)
		actionLenght_ = 0.0;
	//else if ( actionLenght_ > max_length )
	//  actionLenght_ = max_length;
	//}

	pot_ = pot;
	if (!pot_)
		throw std::invalid_argument("Not Possible to have a ref of Potential!!!");

	pot_->setParameters(ref_copy_,
						startParameter_,
						actionLenght_);
	assert(pot_);
	startLenght_ = startParameter_;
}

//-----------------------------------------------------------------------------

void ToonzExt::StrokeParametricDeformer::setMouseMove(double vx,
													  double vy)
{
	vx_ = vx;
	vy_ = vy;
}

//-----------------------------------------------------------------------------

ToonzExt::StrokeParametricDeformer::~StrokeParametricDeformer()
{
	delete pot_;
	delete ref_copy_;
}

//-----------------------------------------------------------------------------

TThickPoint
ToonzExt::StrokeParametricDeformer::getDisplacement(const TStroke &stroke,
													double w) const
{
	// conversion in absolute system for shape deformation
	double val = pot_->value(w);

	assert(val >= 0);

	// amplify movement
	return TThickPoint(vx_ * val, vy_ * val, 0.0);
}

//-----------------------------------------------------------------------------

TThickPoint
ToonzExt::StrokeParametricDeformer::getDisplacementForControlPoint(
	const TStroke &stroke,
	UINT n) const
{
	double w = stroke.getParameterAtControlPoint(n);
	return this->getDisplacement(stroke, w);
}

//-----------------------------------------------------------------------------

TThickPoint
ToonzExt::StrokeParametricDeformer::getDisplacementForControlPointLen(
	const TStroke &stroke,
	double cpLen) const
{
	return this->getDisplacement(stroke, cpLen);
}

//-----------------------------------------------------------------------------

double
ToonzExt::StrokeParametricDeformer::getDelta(const TStroke &stroke,
											 double w) const
{
#if 0
  double  w0 = w;
  if(w0 == 1.0)
    return norm( stroke.getSpeed(1.0));
  double tmp = stroke.getLength(w0);
  tmp+=1.0;
  double w1 = stroke.getParameterAtLength(tmp);

  /*
  double  w1 = w + 0.01;  
  if(w1>1.0)
  {
    w0 = 1.0 - 0.01;
    w1 = 1.0;
  }
  */

  const double  dx = 1.0; //stroke.getLength(w0,w1);
  TThickPoint pnt = this->getDisplacement(stroke,w1) - 
                    this->getDisplacement(stroke,w0);

  double  dy =  sqrt( sq(pnt.x) + sq(pnt.y) + sq(pnt.thick) );

  assert(dx!=0.0);
  return dy/dx;

  /*
  // the increaser is wrong than this value need to be the deformation
  //  value 

  // is norm 
  TThickPoint pnt = this->getDisplacement(stroke,
                                          w);
  return sqrt( sq(pnt.x) + sq(pnt.y) + sq(pnt.thick) );

  //return pot_->gradient(w);
  */
#endif
	return this->getDisplacement(stroke, w).y;
}

//-----------------------------------------------------------------------------

double
ToonzExt::StrokeParametricDeformer::getMaxDiff() const
{
	return diff_;
}

//-----------------------------------------------------------------------------

void ToonzExt::StrokeParametricDeformer::getRange(double &from,
												  double &to)
{
	double x = ref_copy_->getLength(startParameter_);
	double delta = x - actionLenght_ * 0.5;
	if (delta > 0)
		from = ref_copy_->getParameterAtLength(delta);
	else
		from = 0.0;

	delta = x + actionLenght_ * 0.5;
	if (delta < ref_copy_->getLength())
		to = ref_copy_->getParameterAtLength(delta);
	else
		to = 1.0;
}

//-----------------------------------------------------------------------------
//  End Of File
//-----------------------------------------------------------------------------