@use "sass:string";
@use "sass:list";

// --------------------------------------------------
// !!!! Interpolation fix/hack, for issue #32
// --------------------------------------------------

@function str-split($string, $separator: " ") {
  // from: https://stackoverflow.com/questions/32376461/how-to-split-a-string-into-two-lists-of-numbers-in-sass#answer-42295154
  $split-arr: ();  // empty array/list
  $index: str-index($string, $separator);  // first index of separator in string
  @while $index != null {  // loop through string
    $item: str-slice($string, 1, $index - 1);  // get the substring from the first character to the separator
    $split-arr: append($split-arr, $item);  // push item to array
    $string: str-slice($string, $index + 1);  // remove item and separator from string
    $index: str-index($string, $separator);  // find new index of separator
  }
  $split-arr: append($split-arr, $string);  // add the remaining string to list (the last item)
  @return $split-arr;
}

// !!!! ---------- end of Hack

// Button variants

@mixin button-variant-alt(
  $background,
  $border,
  $color: color-contrast($background, $color-contrast-dark-alt, $color-contrast-light-alt, $min-contrast-ratio-alt),
  $hover-background: if($color == $color-contrast-light-alt, shade-color($background, $btn-hover-bg-shade-amount-alt), tint-color($background, $btn-hover-bg-tint-amount-alt)),
  $hover-border: if($color == $color-contrast-light-alt, shade-color($border, $btn-hover-border-shade-amount-alt), tint-color($border, $btn-hover-border-tint-amount-alt)),
  $hover-color: color-contrast($hover-background, $color-contrast-dark-alt, $color-contrast-light-alt, $min-contrast-ratio-alt),
  $active-background: if($color == $color-contrast-light-alt, shade-color($background, $btn-active-bg-shade-amount-alt), tint-color($background, $btn-active-bg-tint-amount-alt)),
  $active-border: if($color == $color-contrast-light-alt, shade-color($border, $btn-active-border-shade-amount-alt), tint-color($border, $btn-active-border-tint-amount-alt)),
  $active-color: color-contrast($active-background, $color-contrast-dark-alt, $color-contrast-light-alt, $min-contrast-ratio-alt),
  $disabled-background: $background,
  $disabled-border: $border,
  $disabled-color: color-contrast($disabled-background, $color-contrast-dark-alt, $color-contrast-light-alt, $min-contrast-ratio-alt),
  $btn-box-shadow: $btn-box-shadow-alt
) {
  color: $color;
  @include gradient-bg($background);
  border-color: $border;
  @include box-shadow($btn-box-shadow);

  &:hover {
    color: $hover-color;
    @include gradient-bg($hover-background);
    border-color: $hover-border;
  }

  // --------------------------------------------------
  // !!!! Interpolation fix/hack, for issue #32
  // --------------------------------------------------
  $in: str-split(#{&});
  $a1: #{null};
  $a2: #{null};
  @if length($in) < 2 {
    $a2: nth($in, 1);
  } @else {
    @for $i from 1 through length($in) - 1 {
      $a1: append($a1, nth($in, $i), space);
    }
    $a2: nth($in, -1);  // last one
  }
  // @debug "$in = #{$in}";
  // @debug "$a1 = #{$a1}";
  // @debug "$a2 = #{$a2}";

  // .www {
  //   content: "---------- WWWWWWWWWW ---------- DEBUG REMOVE THIS";
  // }

  @at-root #{$a1} .btn-check:focus + #{$a2},
  #{$a1} #{$a2}:focus {
    color: $hover-color;
    @include gradient-bg($hover-background);
    border-color: $hover-border;
    @if $enable-shadows {
      @include box-shadow($btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix($color, $border, 15%), .5));
    } @else {
      // Avoid using mixin so we can pass custom focus shadow properly
      box-shadow: 0 0 0 $btn-focus-width rgba(mix($color, $border, 15%), .5);
    }
  }

  @at-root #{$a1} .btn-check:checked + #{$a2},
  #{$a1} .btn-check:active + #{$a2},
  #{$a1} #{$a2}:active,
  #{$a1} #{$a2}.active,
  #{$a1} .show > #{$a2}.dropdown-toggle {
    color: $active-color;
    background-color: $active-background;
    // Remove CSS gradients if they're enabled
    background-image: if($enable-gradients, none, null);
    border-color: $active-border;

    &:focus {
      @if $enable-shadows {
        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix($color, $border, 15%), .5));
      } @else {
        // Avoid using mixin so we can pass custom focus shadow properly
        box-shadow: 0 0 0 $btn-focus-width rgba(mix($color, $border, 15%), .5);
      }
    }
  }

  // .xxx {
  //   content: "---------- XXXXXXXXXX ---------- DEBUG REMOVE THIS";
  // }

  &:disabled,
  &.disabled {
    color: $disabled-color;
    background-color: $disabled-background;
    // Remove CSS gradients if they're enabled
    background-image: if($enable-gradients, none, null);
    border-color: $disabled-border;
  }
}

@mixin button-outline-variant-alt(
  $color,
  $color-hover: color-contrast($color),
  $active-background: $color,
  $active-border: $color,
  $active-color: color-contrast($active-background),
  $btn-active-box-shadow: $btn-active-box-shadow-alt
) {
  color: $color;
  border-color: $color;

  &:hover {
    color: $color-hover;
    background-color: $active-background;
    border-color: $active-border;
  }

  // --------------------------------------------------
  // !!!! Interpolation fix/hack, for issue #32
  // --------------------------------------------------
  $in: str-split(#{&});
  $a1: #{null};
  $a2: #{null};
  @if length($in) < 2 {
    $a2: nth($in, 1);
  } @else {
    @for $i from 1 through length($in) - 1 {
      $a1: append($a1, nth($in, $i), space);
    }
    $a2: nth($in, -1);  // last one
  }

  @at-root #{$a1} .btn-check:focus + #{$a2},
  #{$a1} #{$a2}:focus {
    box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
  }

  @at-root #{$a1} .btn-check:checked + #{$a2},
  #{$a1} .btn-check:active + #{$a2},
  #{$a1} #{$a2}:active,
  #{$a1} #{$a2}.active,
  #{$a1} #{$a2}.dropdown-toggle.show {
    color: $active-color;
    background-color: $active-background;
    border-color: $active-border;

    &:focus {
      @if $enable-shadows {
        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5));
      } @else {
        // Avoid using mixin so we can pass custom focus shadow properly
        box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
      }
    }
  }

  &:disabled,
  &.disabled {
    color: $color;
    background-color: transparent;
  }
}