@use 'sass:map';
@use '../function' as *;
@use '../config' as *;

/// Set the ::selection of an element with automatic foreground color.
/// @param {color} $background - The background color.
/// @param {color} $foreground - The foreground color. If null, the color will be automatically calculated.
/// @param {boolean} $is-direct - If true, the selection will be applied to the current element if false it will be applied to its children.
/// @return {mixin} - The selection mixin.
@mixin selection(
  $background: 'primary',
  $foreground: null,
  $is-direct: false
) {
  $is-variable: false;
  $original-background: $background;

  @if map.has-key($colors, 'base', $background) {
    $background: color($background);
    $is-variable: true;
  }

  @if not $foreground and not $is-variable {
    $foreground: color-contrast($background);
  } @else if not $foreground and $is-variable {
    $foreground: color-contrast(color($original-background, $only-color: true));
  }

  @if $is-direct {
    &::selection {
      background-color: $background;
      color: $foreground;
    }
  } @else {
    ::selection {
      background-color: $background;
      color: $foreground;
    }
  }
}