/***************************************************************************
 *
 * Author: "Sjors H.W. Scheres"
 * MRC Laboratory of Molecular Biology
 *
 * 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.
 *
 * This complete copyright notice must be included in any revised version of the
 * source code. Additional authorship citations may be added, but existing
 * author citations must be preserved.
 ***************************************************************************/
/***************************************************************************
 *
 * Authors:     Carlos Oscar S. Sorzano (coss@cnb.csic.es)
 *
 * Unidad de  Bioinformatica of Centro Nacional de Biotecnologia , CSIC
 *
 * 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
 *
 *  All comments concerning this program package may be sent to the
 *  e-mail address 'xmipp@cnb.csic.es'
 ***************************************************************************/

#ifndef MACROS_H
#define MACROS_H

#ifndef _CYGWIN
#ifdef __APPLE__
#include <limits.h>
#else
#include <values.h>
#endif
#endif

#ifndef MINFLOAT
#define MINFLOAT -1e30
#endif
#ifndef MAXFLOAT
#define MAXFLOAT  1e30
#endif

#ifdef FLOAT_PRECISION
#define DOUBLE float
#define MY_MPI_DOUBLE MPI_FLOAT
#else
#define DOUBLE double
#define MY_MPI_DOUBLE MPI_DOUBLE
#endif



//#define DEBUG
//#define DEBUG_CHECKSIZES

/// @defgroup Macros Macros
/// @ingroup DataLibrary
//@{
/// @name Constants
//@{

/** Pi
 * @ingroup MacrosConstants
 */
#ifndef PI
#define PI 3.14159265358979323846
#endif

/** Equal accuracy
 *
 * In a comparison if two values are closer than this epsilon they are said to
 * be the same. Actually For double precision calculations set to 1e-6, for single-precision set to 1e-4 (finding symmetry subgroups will go wrong otherwise)
 */
#ifdef FLOAT_PRECISION
#define XMIPP_EQUAL_ACCURACY 1e-4
#else
#define XMIPP_EQUAL_ACCURACY 1e-6
#endif
//@}

/// @name Numerical functions
//@{
/** Absolute value
 *
 * Valid for any kind of number (int, short, float, etc)
 *
 * @code
 * x = ABS(x);
 * @endcode
 */
#ifndef ABS
#define ABS(x) (((x) >= 0) ? (x) : (-(x)))
#endif

/** Sign of
 *
 * Valid for any kind of number (int, short, float, etc). It returns +1 or -1
 *
 * @code
 * if (SGN(x) == -1)
 *     std::cout << "x is negative" << std::endl;
 * @endcode
 */
#ifndef SGN
#define SGN(x) (((x) >= 0) ? 1 : -1)
#endif

/** Sign of, considering 0 as 0
 *
 * Valid for any kind of number (int, short, float, etc). It returns +1 if the
 * number is positive, -1 if the number is negative, and 0 if the number is 0.
 *
 * @code
 * if (SGN0(x) == -1)
 *     std::cout << "x is negative" << std::endl;
 * @endcode
 */
#ifndef SGN0
#define SGN0(x) (((x) >= 0) ? (((x) == 0) ? 0:1) : -1)
#endif

/** Minimum
 *
 * Valid for any kind of numbers (int, short, float, etc).
 *
 * @code
 * min_val = XMIPP_MIN(x, y);
 * @endcode
 */
#ifndef XMIPP_MIN
#define XMIPP_MIN(x, y) (((x) >= (y)) ? (y) : (x))
#endif

/** Maximum
 *
 * Valid for any kind of numbers (int, short, float, etc).
 *
 * @code
 * max_val = XMIPP_MAX(x, y);
 * @endcode
 */
#ifndef XMIPP_MAX
#define XMIPP_MAX(x,y) (((x)>=(y))?(x):(y))
#endif

/** Round to next integer
 *
 * Valid for any kind of numbers (int, short, float, etc). The result is of type
 * integer.
 *
 * @code
 * a = ROUND(-0.8); // a = -1
 * a = ROUND(-0.2); // a = 0
 * a = ROUND(0.2); // a = 0
 * a = ROUND(0.8); // a = 1
 * @endcode
 */
#ifndef ROUND
#define ROUND(x) (((x) > 0) ? (int)((x) + 0.5) : (int)((x) - 0.5))
#endif

/** Round to next larger integer
 *
 * Valid for any kind of numbers (int, short, float, etc). The result is of type
 * integer.
 *
 * @code
 * a = CEIL(-0.8); // a = 0
 * a = CEIL(-0.2); // a = 0
 * a = CEIL(0.2); // a = 1
 * a = CEIL(0.8); // a = 1
 * @endcode
 */
#define CEIL(x) (((x) == (int)(x)) ? (int)(x):(((x) > 0) ? (int)((x) + 1) : (int)(x)))

/** Round to next smaller integer
 *
 * Valid for any kind of numbers (int, short, float, etc). The result is of type
 * integer.
 *
 * @code
 * a = FLOOR(-0.8); // a = -1
 * a = FLOOR(-0.2); // a = -1
 * a = FLOOR(0.2); // a = 0
 * a = FLOOR(0.8); // a = 0
 * @endcode
 */
#define FLOOR(x) (((x) == (int)(x)) ? (int)(x):(((x) > 0) ? (int)(x) : (int)((x) - 1)))

/** Return the fractional part of a value
 *
 * The fractional part of 3.7 is 0.7 and of -3.7 is -0.7.
 */
#define FRACTION(x) ((x) - (int)(x))

/** Clip in a saturation fashion
 *
 * CLIP is a macro which acts like a saturation curve, a value x is "clipped" to
 * a range defined by x0 and xF, for example the output values for the following
 * x and CLIP(x,-2,2) would be
 *
 * @code
 * x = ... -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 ...
 * output = ... -2 -2 -2 -2 -2 -2 -2 -1 0 1 2 2 2 2 2 2 2 ...
 * @endcode
 */
#define CLIP(x, x0, xF) (((x) < (x0)) ? (x0) : (((x) > (xF)) ? (xF) : (x)))

/** Wrapping for integers
 *
 * intWRAP performs a wrapping in the integer set, when the cycle is finsihed it
 * begins again. For example, for intWRAP(x,-2,2) would be
 *
 * @code
 * x = ... -8 -7 -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8 ...
 * output = ...  2 -2 -1  0  1  2 -2 -1  0  1  2 -2 -1  0  1  2 -2 ...
 * @endcode
 */
#define intWRAP(x, x0, xF) (((x) >= (x0) && (x) <= (xF)) ? (x) : ((x) < (x0)) ? ((x) - (int)(((x) - (x0) + 1) / ((xF) - (x0) + 1) - 1) *  ((xF) - (x0) + 1)) : ((x) - (int)(((x) - (xF) - 1) / ((xF) - (x0) + 1) + 1) * ((xF) - (x0) + 1)))

/** Wrapping for real numbers
 *
 * realWRAP is used to keep a floating number between a range with a wrapping
 * fashion. For instance, it is used in trigonometry to say that an angle of
 * 5*PI is the same as PI, ie, to keep an angle in the range 0...2*PI
 *
 * @code
 * Corrected_angle = realWRAP(angle, 0, 2*PI);
 * @endcode
 */
#define realWRAP(x, x0, xF) (((x) >= (x0) && (x) <= (xF)) ? (x) : ((x) < (x0))  ? ((x) - (int)(((x) - (x0)) / ((xF) - (x0)) - 1) * ((xF) - (x0))) : ((x) - (int)(((x) - (xF)) / ((xF) - (x0)) + 1) * ((xF) - (x0))))

/** Degrees to radians
 *
 * @code
 * angle_in_radians = DEG2RAD(ang_in_degrees);
 * @endcode
 */
#define DEG2RAD(d) ((d) * PI / 180)

/** Radians to degrees
 *
 * @code
 * angle_in_degrees = RAD2DEG(ang_in_radians);
 * @endcode
 */
#define RAD2DEG(r) ((r) * 180 / PI)

/** Cosine in degrees
 *
 * @code
 * if (COSD(90) == 0)
 *     std::cout << "This is in degrees!\n";
 * @endcode
 */
#define COSD(x) cos(PI * (x) / 180.)

/** ArcCosine in degrees
 *
 * @code
 * if (ACOSD(0.5) == 60)
 *     std::cout << "This is in degrees!\n";
 * @endcode
 */
#define ACOSD(x) acos((x)) * 180. / PI

/** Sine in degrees
 *
 * @code
 * if (SIND(90) == 1)
 *     std::cout << "This is in degrees!\n";
 * @endcode
 */
#define SIND(x) sin(PI * (x) / 180.)

/** ArcSine in degrees
 *
 * @code
 * if (ASIND(0.5) == 30.)
 *     std::cout << "This is in degrees!\n";
 * @endcode
 */
#define ASIND(x) asin((x)) * 180. / PI

/** SINC function
 *
 * The sinc function is defined as sin(PI*x)/(PI*x).
 */
#define SINC(x) (((x) < 0.0001 && (x) > -0.0001) ? 1 : sin(PI * (x)) / (PI * (x)))

/** Returns next positive power_class of 2
 *
 * It is supposed that the given number is positive although it's not needed to
 * be an integer
 *
 * @code
 * next_power = NEXT_POWER_OF_2(1000); // next_power = 1024
 * @endcode
 */
#define NEXT_POWER_OF_2(x) pow(2, ceil(log((DOUBLE) x) / log(2.0)-XMIPP_EQUAL_ACCURACY) )

/** Linear interpolation
 *
 * From low (when a=0) to high (when a=1). The following value is returned
 * (equal to (a*h)+((1-a)*l)
 */
#define LIN_INTERP(a, l, h) ((l) + ((h) - (l)) * (a))

/** XOR
 *
 * Logical Xor
 */
#define XOR(a, b) (((a) && !(b)) || (!(a) && (b)))
//@}

/// @name Miscellaneous
//@{

/** Swap two values
 *
 * It uses a temporal variable which must be of the same type as the two
 * parameters
 */
#define SWAP(a, b, tmp) { tmp = a; a = b; b = tmp; }

/** Starting point for Xmipp volume/image
 *
 * Given a size (in some direction), this function returns the first index for
 * a volume/image/array with this size. The formula is -(int) ((float) (size)
 * / 2.0)
 */
#define FIRST_XMIPP_INDEX(size) -(long int)((float) (size) / 2.0)

/** Starting point for Xmipp volume/image
 * @ingroup MacrosMisc
 *
 * Given a size (in some direction), this function returns the first index for a
 * volume/image/array with this size. The formula is FIRST_XMIPP_INDEX(size) +
 * (size) - 1
 */
#define LAST_XMIPP_INDEX(size) FIRST_XMIPP_INDEX(size) + (size) - 1
//@}
//@}
#endif
