@use "sass:list";
@use "sass:map";
@use "sass:math";
@use "sass:meta";

$baseline: 16px !default;
$fallback: false !default;
$px-only: false !default;

// Dart Sass <1.33.0 compatibility
@function _divide($a, $b) {
  @if map.has-key(meta.module-functions("math"), "div") {
    @return math.div($a, $b);
  }

  @return $a / $b;
}

@function _convert($to, $values...) {
  $result: ();
  $separator: list.separator($values);

  @each $value in $values {
    @if meta.type-of($value) == "number" and math.unit($value) == "rem" and $to == "px" {
      $result: list.append($result, _divide($value, 1rem) * $baseline, $separator);
    } @else if meta.type-of($value) == "number" and math.unit($value) == "px" and $to == "rem" {
      $result: list.append($result, _divide($value, $baseline) * 1rem, $separator);
    } @else if meta.type-of($value) == "list" {
      $result: list.append($result, _convert($to, $value...), $separator);
    } @else {
      $result: list.append($result, $value, $separator);
    }
  }

  @return if(list.length($result) == 1, list.nth($result, 1), $result);
}

@function convert($values...) {
  @if $px-only {
    @return _convert(px, $values...);
  } @else {
    @return _convert(rem, $values...);
  }
}

@mixin convert($properties, $values...) {
  @if meta.type-of($properties) == "map" {
    @each $property, $values in $properties {
      @include convert($property, $values);
    }
  } @else {
    @each $property in $properties {
      @if $fallback or $px-only {
        #{$property}: _convert(px, $values...);
      }
      @if not $px-only {
        #{$property}: _convert(rem, $values...);
      }
    }
  }
}

@mixin baseline($zoom: 100%) {
  font-size: _divide($zoom, 16px) * $baseline;
}

// Proxy when used with a different namespace
@function rem($values...) {
  @return convert($values...);
}

@mixin rem($properties, $values...) {
  @include convert($properties, $values...);
}

// Proxy when imported globally
@function rem-convert($values...) {
  @return convert($values...);
}

@mixin rem-convert($properties, $values...) {
  @include convert($properties, $values...);
}