@import './tinycolor.scss';

$hueStep: 2;
$saturationStep: 16;
$saturationStep2: 5;
$brightnessStep1: 5;
$brightnessStep2: 15;
$lightColorCount: 5;
$darkColorCount: 4;

@function gethue($h, $s, $v, $i, $isLight) {
  $hue: null;

  @if ($h >= 60 and $h <= 240) {
    @if ($isLight == true) {
      $hue: $h - $hueStep * $i;
    }

    @else {
      $hue: $h + $hueStep * $i;
    }
  }

  @else {
    @if ($isLight == true) {
      $hue: $h + $hueStep * $i;
    }

    @else {
      $hue: $h - $hueStep * $i;
    }
  }

  @if ($hue < 0) {
    $hue: $hue + 360;
  }

  @else if ($hue >= 360) {
    $hue: $hue - 360;
  }

  @return $hue;
}

@function getsaturation($h, $s, $v, $i, $isLight) {
  $saturation: 0;

  @if ($isLight) {
    $saturation: $s - $saturationStep * $i;
  }

  @else if ($i == $darkColorCount) {
    $saturation: $s + $saturationStep;
  }

  @else {
    $saturation: $s + $saturationStep2 * $i;
  }

  @if ($saturation > 100) {
    $saturation: 100;
  }

  @if ($isLight and $i == $lightColorCount and $saturation > 10) {
    $saturation: 10;
  }

  @if ($saturation < 6) {
    $saturation: 6;
  }

  @return round($saturation);
}

@function getvalue($h, $s, $v, $i, $isLight) {
  @if ($isLight) {
    @return $v + $brightnessStep1 * $i;
  }

  @return $v - $brightnessStep2 * $i;
}

@function colorpalette($color, $index) {
  $isLight: $index <= 6;
  $i: 0;
  $hsv: ch-color-to-hsv($color);
  $h: nth($hsv, 1);
  $s: nth($hsv, 2);
  $v: nth($hsv, 3);

  @if ($index <= 6) {
    $i: $lightColorCount + 1 - $index;
  }

  @else {
    $i: $index - $lightColorCount - 1;
  }
  $adjustHue: round(gethue($h, $s, $v, $i, $isLight));
  $adjustSaturation: getsaturation($h, $s, $v, $i, $isLight);
  $adjustLight: getvalue($h, $s, $v, $i, $isLight);

  @return ch-hsv-to-color($adjustHue, $adjustSaturation, $adjustLight);
}