/*
   math/functions.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#ifndef __INCLUDED_MATH_FUNCTIONS_H__
#define __INCLUDED_MATH_FUNCTIONS_H__

#include <cmath>
#include <cstdlib>
#include <cmath>

namespace math
{

/**
 * @brief return the smallest of two floats
 */
inline const float min(const float a, const float b)
{
	return (a < b ? a : b);
}

/**
 * @brief return the smallest of two integers
 */
inline const int min(const int a, const int b)
{
	return (a < b ? a : b);
}

/**
 * @brief return the smallest of two longs
 */
inline const long min(const long a, const long b)
{
	return (a < b ? a : b);
}

/**
 * @brief return the largest of two floats
 */
inline const float max(const float a, const float b)
{
	return (a > b ? a : b);
}

/**
 * @brief return the largest of two integers
 */
inline const int max(const int a, const int b)
{
	return (a > b ? a : b);
}

/**
 * @brief return the largest of two longs
 */
inline const long max(const long a, const long b)
{
	return (a > b ? a : b);
}

 /**
  * @brief returns a random float
  * The value returned will be in the interval [0-max]
  *  @param max the maximum value returned
  * */
inline float randomf(const float max = 1.0f)
{
	return ((float) rand() / (float) RAND_MAX) * max;
}

 /**
  * @brief returns a random float
  * The value returned will be in the interval [min-max]
  * */
inline float randomf(const float min, const float max)
{
	return (min + randomf(max - min));
}

/**
 * @brief returns a random integer
 * The value returned will be in the interval [0-(max-1)]
 *  @param max the maximum value returned
 * */

inline unsigned randomi(const unsigned int max)
{
	return ((unsigned int)(rand() % max));
}

/// return the sign of a float value
float sgnf(float value);

/// return an angle in the ]-180,180] range
float degrees180f(float angle);

/// return an angle in the [0,360[ range
float degrees360f(float angle);

/// clamp a float to a specified range
inline void clamp(float &value, const float min = 0.0f, const float max = 1.0f)
{
	if (value < min)
		value = min;
	else if (value > max)
		value = max;
}

/// return the absolute value of a float
inline float absf(const float f)
{
	return ( f < 0.0f ? -f : f );
}

/// swap two float values
inline void swap(float &x, float &y)
{
	float tmp = x;
	x = y;
	y = tmp;
}

} // namespace math

#endif // __INCLUDED_MATH_FUNCTIONS_H__