@use 'sass:math';
@use '../../functions/is-integer' as *;
@use '../../functions/make-long-shadow' as *;

/// Creates a long shadow effect on text.
///
/// @param {Color} $color [hsla(0, 0%, 15%, 0.95)] - The color of the long shadow.
/// @param {Number} $longness [20] - Used to calculate the length of the shadow.
/// Must be a unitless integer greater than 0.
///
/// @group Utilities
/// @require {function} is-integer
/// @require {function} make-long-shadow
@mixin long-shadow($color: hsla(0, 0%, 15%, 0.95), $longness: 20) {
  @if not is-integer($longness) or
      not math.is-unitless($longness) or
      $longness <= 0
  {
    @error 'Invalid input for $longness in the [ long-shadow() ] ' +
        'mixin. This value must be a unitless integer greater than 0. ' +
        'It is used by the mixin to calculate the values for the length ' +
        'of the shadow.';
  }

  text-shadow: make-long-shadow($color, $longness);
}