/*
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get-font-stack()
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Get a font stack from a style- or
role-based font token.
----------------------------------------
*/

@use "sass:map";
@use "sass:string";
@use "../../variables/font-type-tokens" as types;
@use "../../tokens/font/typefaces" as typefaces;
@use "../../functions/general";
@use "convert-to-font-type" as *;

@function get-font-stack($token) {
  // Start by converting to a type token (sans, serif, etc)
  $type-token: convert-to-font-type($token);
  $output-display-name: true;
  $this-stack: null;
  // Get the font type metadata
  $this-font-map: map.get(types.$project-font-type-tokens, $type-token);
  // Only output if the font type has an assigned typeface token
  @if map.get($this-font-map, "typeface-token") {
    $this-font-token: map.get($this-font-map, "typeface-token");
    // Get the typeface metadata
    $this-typeface-data: map.get(
      typefaces.$all-typeface-tokens,
      $this-font-token
    );
    $this-name: map.get($this-typeface-data, "display-name");
    // If it's a system typeface, don't output the display name
    @if map.has-key($this-typeface-data, "system-font") {
      $output-display-name: false;
      // @debug "it's a system font";
    }
    // If there's a custom stack, use it and output the display name
    @if map.get($this-font-map, "custom-stack") {
      $this-stack: map.get($this-font-map, "custom-stack");
      $output-display-name: true;
      // @debug "it has a custom stack";
    }
    // Otherwise, just get the token's default stack
    @else {
      $this-stack: general.map-deep-get(
        typefaces.$all-typeface-tokens,
        $this-font-token,
        "stack"
      );
    }
    // If the typeface has no display name (system fonts), don't output the display name
    @if not map.get($this-typeface-data, "display-name") {
      $output-display-name: false;
    }
    @if not $output-display-name {
      @return #{$this-stack};
    }
    @return string.unquote("#{$this-name}, #{$this-stack}");
  }
  @return false;
}

// @debug get-font-stack("heading");
// @return Merriweather Web, Georgia, Cambria, Times New Roman, Times, serif