// Math module for division
@use "sass:math";

$values: (
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  "255": 1
);
  
  
@function luminance($color) {

  $luminance: null;
  
  $R: red($color);
  $Rg: map-get($values, #{$R});
  
  $G: green($color);
  $Gg: map-get($values, #{$G});

  $B: blue($color);
  $Bg: map-get($values, #{$B});

  $luminance: 0.2126 * $Rg + 0.7152 * $Gg + 0.0722 * $Bg;
  
  @return $luminance;
}

@function contrast-ratio($color1, $color2) {
  $luminance-color1: luminance($color1);
  $luminance-color2: luminance($color2);
  
  //(L1 + 0.05) / (L2 + 0.05) Where L1 is the larger relative luminance, and L2 is the smaller
  $contrast-ratio: null;
  @if $luminance-color1 > $luminance-color2 {
    $contrast-ratio: math.div($luminance-color1 + 0.05, $luminance-color2 + 0.05);
  } 
  @else {
    $contrast-ratio: math.div($luminance-color2 + 0.05, $luminance-color1 + 0.05);
  }
   
  @return $contrast-ratio;
}