// Bootstrap functions
//
// Utility mixins and functions for evaluating source code across our variables, maps, and mixins.

// Ascending
// Used to evaluate Sass maps like our grid breakpoints.
@mixin _assert-ascending($map, $map-name) {
  $prev-key: null;
  $prev-num: null;
  @each $key, $num in $map {
    @if $prev-num == null or unit($num) == "%" or unit($prev-num) == "%" {
      // Do nothing
    } @else if not comparable($prev-num, $num) {
      @warn "Potentially invalid value for #{$map-name}: This map must be in ascending order, but key '#{$key}' has value #{$num} whose unit makes it incomparable to #{$prev-num}, the value of the previous key '#{$prev-key}' !";
    } @else if $prev-num >= $num {
      @warn "Invalid value for #{$map-name}: This map must be in ascending order, but key '#{$key}' has value #{$num} which isn't greater than #{$prev-num}, the value of the previous key '#{$prev-key}' !";
    }
    $prev-key: $key;
    $prev-num: $num;
  }
}

// Starts at zero
// Used to ensure the min-width of the lowest breakpoint starts at 0.
@mixin _assert-starts-at-zero($map, $map-name: "$grid-breakpoints") {
  @if length($map) > 0 {
    $values: map-values($map);
    $first-value: nth($values, 1);
    @if $first-value != 0 {
      @warn "First breakpoint in #{$map-name} must start at 0, but starts at #{$first-value}.";
    }
  }
}

// Internal Bootstrap function to turn maps into its negative variant.
// It prefixes the keys with `n` and makes the value negative.
@function negativify-map($map) {
  $result: ();
  @each $key, $value in $map {
    @if $key != 0 {
      $result: map-merge($result, ("n" + $key: (-$value)));
    }
  }
  @return $result;
}

// Get multiple keys from a sass map
@function map-get-multiple($map, $values) {
  $result: ();
  @each $key, $value in $map {
    @if (index($values, $key) != null) {
      $result: map-merge($result, ($key: $value));
    }
  }
  @return $result;
}

// Replace `$search` with `$replace` in `$string`
// Used on our SVG icon backgrounds for custom forms.
//
// @author Hugo Giraudel
// @param {String} $string - Initial string
// @param {String} $search - Substring to replace
// @param {String} $replace ('') - New value
// @return {String} - Updated string
@function str-replace($string, $search, $replace: "") {
  $index: str-index($string, $search);

  @if $index {
    @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
  }

  @return $string;
}

// See https://codepen.io/kevinweber/pen/dXWoRw
//
// Requires the use of quotes around data URIs.

@function escape-svg($string) {
  @if str-index($string, "data:image/svg+xml") {
    @each $char, $encoded in $escaped-characters {
      // Do not escape the url brackets
      @if str-index($string, "url(") == 1 {
        $string: url("#{str-replace(str-slice($string, 6, -3), $char, $encoded)}");
      } @else {
        $string: str-replace($string, $char, $encoded);
      }
    }
  }

  @return $string;
}

// Color contrast
// See https://github.com/twbs/bootstrap/pull/30168

// A list of pre-calculated numbers of pow(($value / 255 + .055) / 1.055, 2.4). (from 0 to 255)
// stylelint-disable-next-line scss/dollar-variable-default, scss/dollar-variable-pattern
$_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003 .0033 .0037 .004 .0044 .0048 .0052 .0056 .006 .0065 .007 .0075 .008 .0086 .0091 .0097 .0103 .011 .0116 .0123 .013 .0137 .0144 .0152 .016 .0168 .0176 .0185 .0194 .0203 .0212 .0222 .0232 .0242 .0252 .0262 .0273 .0284 .0296 .0307 .0319 .0331 .0343 .0356 .0369 .0382 .0395 .0409 .0423 .0437 .0452 .0467 .0482 .0497 .0513 .0529 .0545 .0561 .0578 .0595 .0612 .063 .0648 .0666 .0685 .0704 .0723 .0742 .0762 .0782 .0802 .0823 .0844 .0865 .0887 .0908 .0931 .0953 .0976 .0999 .1022 .1046 .107 .1095 .1119 .1144 .117 .1195 .1221 .1248 .1274 .1301 .1329 .1356 .1384 .1413 .1441 .147 .15 .1529 .1559 .159 .162 .1651 .1683 .1714 .1746 .1779 .1812 .1845 .1878 .1912 .1946 .1981 .2016 .2051 .2086 .2122 .2159 .2195 .2232 .227 .2307 .2346 .2384 .2423 .2462 .2502 .2542 .2582 .2623 .2664 .2705 .2747 .2789 .2831 .2874 .2918 .2961 .3005 .305 .3095 .314 .3185 .3231 .3278 .3325 .3372 .3419 .3467 .3515 .3564 .3613 .3663 .3712 .3763 .3813 .3864 .3916 .3968 .402 .4072 .4125 .4179 .4233 .4287 .4342 .4397 .4452 .4508 .4564 .4621 .4678 .4735 .4793 .4851 .491 .4969 .5029 .5089 .5149 .521 .5271 .5333 .5395 .5457 .552 .5583 .5647 .5711 .5776 .5841 .5906 .5972 .6038 .6105 .6172 .624 .6308 .6376 .6445 .6514 .6584 .6654 .6724 .6795 .6867 .6939 .7011 .7084 .7157 .7231 .7305 .7379 .7454 .7529 .7605 .7682 .7758 .7835 .7913 .7991 .807 .8148 .8228 .8308 .8388 .8469 .855 .8632 .8714 .8796 .8879 .8963 .9047 .9131 .9216 .9301 .9387 .9473 .956 .9647 .9734 .9823 .9911 1;

@function color-contrast($background, $color-contrast-dark: $color-contrast-dark, $color-contrast-light: $color-contrast-light, $min-contrast-ratio: $min-contrast-ratio) {
  $foregrounds: $color-contrast-light, $color-contrast-dark, $white, $black;
  $max-ratio: 0;
  $max-ratio-color: null;

  @each $color in $foregrounds {
    $contrast-ratio: contrast-ratio($background, $color);
    @if $contrast-ratio > $min-contrast-ratio {
      @return $color;
    } @else if $contrast-ratio > $max-ratio {
      $max-ratio: $contrast-ratio;
      $max-ratio-color: $color;
    }
  }

  @warn "Found no color leading to #{$min-contrast-ratio}:1 contrast ratio against #{$background}...";

  @return $max-ratio-color;
}

@function contrast-ratio($background, $foreground: $color-contrast-light) {
  $l1: luminance($background);
  $l2: luminance(opaque($background, $foreground));

  @return if($l1 > $l2, ($l1 + .05) / ($l2 + .05), ($l2 + .05) / ($l1 + .05));
}

// Return WCAG2.0 relative luminance
// See https://www.w3.org/WAI/GL/wiki/Relative_luminance
// See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
@function luminance($color) {
  $rgb: (
    "r": red($color),
    "g": green($color),
    "b": blue($color)
  );

  @each $name, $value in $rgb {
    $value: if($value / 255 < .03928, $value / 255 / 12.92, nth($_luminance-list, $value + 1));
    $rgb: map-merge($rgb, ($name: $value));
  }

  @return (map-get($rgb, "r") * .2126) + (map-get($rgb, "g") * .7152) + (map-get($rgb, "b") * .0722);
}

// Return opaque color
// opaque(#fff, rgba(0, 0, 0, .5)) => #808080
@function opaque($background, $foreground) {
  @return mix(rgba($foreground, 1), $background, opacity($foreground) * 100);
}

// scss-docs-start color-functions
// Tint a color: mix a color with white
@function tint-color($color, $weight) {
  @return mix(white, $color, $weight);
}

// Shade a color: mix a color with black
@function shade-color($color, $weight) {
  @return mix(black, $color, $weight);
}

// Shade the color if the weight is positive, else tint it
@function shift-color($color, $weight) {
  @return if($weight > 0, shade-color($color, $weight), tint-color($color, -$weight));
}
// scss-docs-end color-functions

// Return valid calc
@function add($value1, $value2, $return-calc: true) {
  @if $value1 == null {
    @return $value2;
  }

  @if $value2 == null {
    @return $value1;
  }

  @if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
    @return $value1 + $value2;
  }

  @return if($return-calc == true, calc(#{$value1} + #{$value2}), $value1 + unquote(" + ") + $value2);
}

@function subtract($value1, $value2, $return-calc: true) {
  @if $value1 == null and $value2 == null {
    @return null;
  }

  @if $value1 == null {
    @return -$value2;
  }

  @if $value2 == null {
    @return $value1;
  }

  @if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
    @return $value1 - $value2;
  }

  @return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
}
@function choose-contrast-color($color) {
  $lightContrast: contrast($color, white);
  $darkContrast: contrast($color, black);

  @if ($lightContrast > $darkContrast) {
    @return white;
  }
  @else {
    @return black;
  }
}

/**
 * Calculate the luminance for a color.
 * See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
 */
 @function luminance($color) {
  $red: nth($linear-channel-values, red($color) + 1);
  $green: nth($linear-channel-values, green($color) + 1);
  $blue: nth($linear-channel-values, blue($color) + 1);

  @return .2126 * $red + .7152 * $green + .0722 * $blue;
}

/**
 * Calculate the contrast ratio between two colors.
 * See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
 */
@function contrast($back, $front) {
  $backLum: luminance($back) + .05;
  $foreLum: luminance($front) + .05;

  @return max($backLum, $foreLum) / min($backLum, $foreLum);
}

//
// Copyright 2017 Google Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

// Precomputed linear color channel values, for use in contrast calculations.
// See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
//
// Algorithm, for c in 0 to 255:
// f(c) {
//   c = c / 255;
//   return c < 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
// }
//
// This lookup table is needed since there is no `pow` in SASS.
// prettier-ignore
$linear-channel-values:
  0
  .0003035269835488375
  .000607053967097675
  .0009105809506465125
  .00121410793419535
  .0015176349177441874
  .001821161901293025
  .0021246888848418626
  .0024282158683907
  .0027317428519395373
  .003035269835488375
  .003346535763899161
  .003676507324047436
  .004024717018496307
  .004391442037410293
  .004776953480693729
  .005181516702338386
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  .006048833022857054
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  .007499032043226175
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  .013702083047289686
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  .017641954488384078
  .018500220128379697
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  .07227185068231748
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  .07618538148130785
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  .08021982031446832
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  .08437621154414882
  .08650046203654976
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  .12213877222960187
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  .12743768043564743
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  .13286832155381798
  .13563332965520566
  .13843161503245183
  .14126329114027164
  .14412847085805777
  .14702726649759498
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  .15292615199615017
  .1559264637078274
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  .23074004852434915
  .23455058216100522
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  .24620132670783548
  .25015828472995344
  .25415209433082675
  .2581828529215958
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  .2704977910130658
  .27467731206038465
  .2788942634768104
  .2831487404299921
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  .2961382707983211
  .3005437944157765
  .3049873140698863
  .30946892281750854
  .31398871337571754
  .31854677812509186
  .32314320911295075
  .3277780980565422
  .33245153634617935
  .33716361504833037
  .3419144249086609
  .3467040563550296
  .35153259950043936
  .3564001441459435
  .3613067797835095
  .3662525955988395
  .3712376804741491
  .3762621229909065
  .38132601143253014
  .386429433787049
  .39157247774972326
  .39675523072562685
  .4019777798321958
  .4072402119017367
  .41254261348390375
  .4178850708481375
  .4232676699860717
  .4286904966139066
  .43415363617474895
  .4396571738409188
  .44520119451622786
  .45078578283822346
  .45641102318040466
  .4620769996544071
  .467783796112159
  .47353149614800955
  .4793201831008268
  .4851499400560704
  .4910208498478356
  .4969329950608704
  .5028864580325687
  .5088813208549338
  .5149176653765214
  .5209955732043543
  .5271151257058131
  .5332764040105052
  .5394794890121072
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  .5711248294648731
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  .6583748172794485
  .665387298282272
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  .6866853124353135
  .6938717612919899
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  .7156935005064807
  .7230551289219693
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  .7379104087727308
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  .7529422167760779
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  .768151147247507
  .7758222183174236
  .7835377915261935
  .7912979403326302
  .799102738014409
  .8069522576692516
  .8148465722161012
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  .8307698767746546
  .83879901174074
  .846873231509858
  .8549926081242338
  .8631572134541023
  .8713671191987972
  .8796223968878317
  .8879231178819663
  .8962693533742664
  .9046611743911496
  .9130986517934192
  .9215818562772946
  .9301108583754237
  .938685728457888
  .9473065367331999
  .9559733532492861
  .9646862478944651
  .9734452903984125
  .9822505503331171
  .9911020971138298
  1;