#include "trop.h"

#include "hsvutil.h"

void OLDRGB2HSV(double r, double g, double b, double *h, double *s, double *v) {

  double max, min;

  double delta;

  max = std::max({r, g, b});

  min = std::min({r, g, b});

  *v = max;

  if (max != 0)

    *s = (max - min) / max;

  else

    *s = 0;

  if (*s == 0)

    *h = 0;

  else {

    delta = max - min;

    if (r == max)

      *h = (g - b) / delta;

    else if (g == max)

      *h = 2 + (b - r) / delta;

    else if (b == max)

      *h = 4 + (r - g) / delta;

    *h   = *h * 60;

    if (*h < 0) *h += 360;

  }

}

void OLDHSV2RGB(double hue, double sat, double value, double *red,

                double *green, double *blue) {

  int i;

  double p, q, t, f;

  //  if (hue > 360 || hue < 0)

  //    hue=0;

  if (hue > 360) hue -= ((int)hue / 360) * 360;

  // hue-=360;

  if (hue < 0) hue += (1 - (int)hue / 360) * 360;

  // hue+=360;

  if (sat < 0) sat     = 0;

  if (sat > 1) sat     = 1;

  if (value < 0) value = 0;

  if (value > 1) value = 1;

  if (sat == 0) {

    *red   = value;

    *green = value;

    *blue  = value;

  } else {

    if (hue == 360) hue = 0;

    hue = hue / 60;

    i   = (int)hue;

    f   = hue - i;

    p   = value * (1 - sat);

    q   = value * (1 - (sat * f));

    t   = value * (1 - (sat * (1 - f)));

    switch (i) {

    case 0:

      *red   = value;

      *green = t;

      *blue  = p;

      break;

    case 1:

      *red   = q;

      *green = value;

      *blue  = p;

      break;

    case 2:

      *red   = p;

      *green = value;

      *blue  = t;

      break;

    case 3:

      *red   = p;

      *green = q;

      *blue  = value;

      break;

    case 4:

      *red   = t;

      *green = p;

      *blue  = value;

      break;

    case 5:

      *red   = value;

      *green = p;

      *blue  = q;

      break;

    }

  }

}