////
/// @group Selectors
////
@use "sass:list";

/// Default domains treated as internal (excluded from external-link matching).
/// Covers common Threespot infrastructure hostnames so every site picks them
/// up without configuration.
/// @type List
$external-href-base-domains: ("lndo.site", "//localhost", "pantheonsite.io") !default;

/// Site-specific domains treated as internal, appended to
/// `$external-href-base-domains`. Typically the production and staging
/// hostnames a project should not flag as external.
/// @type List
$external-href-domains: () !default;

/// Match anchor elements whose `href` points to an external domain.
/// Uses `:where()` to keep specificity low so other rules (e.g. download
/// links) can override when an external link is also a download.
///
/// @param {List} $domains [$external-href-domains] - Per-call domain list,
///   appended to `$external-href-base-domains`. Defaults to the
///   module-level `$external-href-domains` so consumers can configure once
///   via `@use ... with (...)` and call the mixin with no arguments.
///
/// @example scss
///   @use "frontline-sass/src/frontline" as * with (
///     $external-href-domains: ("example.com", "staging.example.com")
///   );
///
///   a {
///     @include is-external-href {
///       &:after { content: " (external)"; }
///     }
///   }
@mixin is-external-href($domains: $external-href-domains) {
  $all: list.join($external-href-base-domains, $domains);
  $selector: "";

  @each $domain in $all {
    @if $selector == "" {
      $selector: '[href*="#{$domain}"]';
    } @else {
      $selector: '#{$selector}, [href*="#{$domain}"]';
    }
  }

  &:where([href^="http"]:not(#{$selector})) {
    @content;
  }
}