#ifndef TNZ_EXTUTIL_H
#define TNZ_EXTUTIL_H

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

#include "tcommon.h"
#include <tvectorimage.h>

#undef DVAPI
#undef DVVAR
#ifdef TNZEXT_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

#include "ext/Types.h"

namespace ToonzExt
{
// Functions for straight corners management.
/**
   * @brief Like cornersDetector but for straight corners.
   */
DVAPI bool
straightCornersDetector(const TStroke *stroke,
						std::vector<double> &corners);

/**
   * @brief Find intervals where stroke is a straight line.
   *
   * These intervals are stored in an @c vector od Interval.
   */
DVAPI bool
detectStraightIntervals(const TStroke *stroke,
						ToonzExt::Intervals &intervals,
						double tolerance = TConsts::epsilon);

/**
   * @brief Retrieve parameters for straight intervals 
   * near actualW parameter.
   *
   * @return If not found return [-1,-1] interval, else 
   *         the correct interval.
   */
DVAPI bool
findNearestStraightCorners(const TStroke *s,
						   double actualW,
						   Interval &out,
						   const ToonzExt::Intervals *const cl = 0,
						   double tolerance = TConsts::epsilon);

/**
   */
DVAPI bool
isAStraightCorner(const TStroke *s,
				  double actualW,
				  const ToonzExt::Intervals *const cl = 0,
				  double tolerance = TConsts::epsilon);

// Functions for spire corners management.

/**
   * @brief Enhanced version of Toonz detect corners.
   */
DVAPI bool
cornersDetector(const TStroke *stroke,
				int minDegree,
				std::vector<double> &corners);

/**
   * @brief Find intervals where stroke has limited from spire.
   *
   * These intervals are stored in an @c vector od Interval.
   */
DVAPI bool
detectSpireIntervals(const TStroke *stroke,
					 ToonzExt::Intervals &intervals,
					 int minDegree);

/**
   * @brief Retrieve parameters for corners near actualW parameter.
   */
DVAPI bool
findNearestSpireCorners(const TStroke *s,
						double actualW,
						Interval &out,
						int cornerSize,
						const ToonzExt::Intervals *const cl = 0,
						double tolerance = TConsts::epsilon);

/**
   */
DVAPI bool
isASpireCorner(const TStroke *s,
			   double w,
			   int cornerSize,
			   const ToonzExt::Intervals *const cl = 0,
			   double tolerance = TConsts::epsilon);

/**
   * @brief Retrieve corners of a TStroke.
   */
DVAPI void
findCorners(const TStroke *stroke,
			Intervals &corners,
			Intervals &intervals,
			int angle,
			double tolerance);

/**
   * @brief Retrieve corners of a TStroke.
   */
DVAPI bool
findNearestCorners(const TStroke *stroke,
				   double w,
				   Interval &out,
				   const Intervals &values,
				   double tolerance = TConsts::epsilon);

//  Stroke related functions.

/**
   * @brief Rotate the control point at even position [0,2,4,...] in a
   * new position along the close path of a selfLoop stroke.
   *
   * The new position is: @b atLenght.
   * @return 0 if some problem occurs, else the new stroke.
   * @todo Some refactoring required, code duplication.
   */
DVAPI TStroke *
rotateControlPoint(const TStroke *stroke,
				   const ToonzExt::EvenInt &even,
				   double atLenght);

/**
   * Retrieve all parameters where stroke has a minimum.
   */
DVAPI bool
getAllW(const TStroke *stroke,
		const TPointD &pnt,
		double &dist2,
		std::vector<double> &parameters);
/**
   * @brief Replace a stroke in a vector image.
   */
DVAPI bool
replaceStroke(TStroke *old_stroke,
			  TStroke *new_stroke,
			  unsigned int n_,
			  TVectorImageP &vi);

/**
   * @brief Copy several parameters that are not 
   *        copied with operator= 
   */
void cloneStrokeStatus(const TStroke *from,
					   TStroke *to);

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

template <class T>
inline bool
isValid(const T *s)
{
	assert(0 != s);
	if (!s)
		return false;
	return true;
}

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

inline bool
isValid(double w)
{
	assert(0.0 <= w &&
		   w <= 1.0);
	if (w < 0.0 ||
		w > 1.0)
		return false;
	return true;
}

//---------------------------------------------------------------------------
}

#endif /* TNZ_EXTUTIL_H */
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//  End Of File
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