// –––––––––––––––––––––––––––––––––––––––––––––––––––––––––
//  Google Fonts  v.2.0.0
// –––––––––––––––––––––––––––––––––––––––––––––––––––––––––
//
//  Subset config
//
//  Note!
//  The Latin subset is always included if available and need not be specified.
//  Please note that if a client browser supports unicode-range the subset parameter
//  is ignored; the browser will select from the subsets supported by the font to
//  get what it needs to render the text.
//  Source: https://developers.google.com/fonts/docs/getting_started
//
$google-font-subsets: (
        'arabic'      : false
, 'bengali'     : false
, 'cyrillic'    : false
, 'cyrillic-ext': false
, 'devanagari'  : false
, 'greek'       : false
, 'greek-ext'   : false
, 'gujarati'    : false
, 'hebrew'      : false
, 'khmer'       : false
, 'latin'       : false
, 'latin-ext'   : false
, 'tamil'       : false
, 'telugu'      : false
, 'thai'        : false
, 'vietnamese'  : false
) !default;

//
//   Google Fonts
//
@mixin google-font(
  $name   : null,     //  string (unquoted will work too)
  $weights: 400,      //  list or numeric value (100 200 300 400 ...)
  $styles : normal,   //  list or string (normal and or italic)
  $text   : null      //  string (don\'t forget to unescape )
){
  //  base url
  $URL: '//fonts.googleapis.com/css?family=';

  //  create global variables
  @if not variable-exists(__gf__combine){ $__gf__combine: false !global; }
  @if not variable-exists(__gf__map){ $__gf__map: () !global; }
  @if not variable-exists(google-font-subsets){ $google-font-subsets: () !global; }

  //  append italic to weights
  @if index($styles, italic) and not str-index($weights+'',i){
    $wgt: if(index($styles, normal), $weights, ());
    @each $weight in $weights { $wgt: append($wgt, $weight + i); }
    $weights: $wgt;
  }

  //  reduce and encode text
  @if $text {
    $list: __gf__list-unique(__gf__str-explode($text));
    $text:'&text=';
    $encode:('!':'%21','#':'%23','$':'%24','&':'%26','\'':'%27',
            '(':'%28',')':'%29','*':'%2A','+':'%2B',',':'%2C',
            '/':'%2F',':':'%3A',';':'%3B','=':'%3D','?':'%3F',
            '@':'%40','[':'%5B',']':'%5D',' ':'%20');
    @for $i from 1 through length($list) {
      $char: map-get($encode,nth($list,$i)) or nth($list,$i);
      $text: $text + $char;
    }
  }

  //  subsets from config
  $subset: '';
  @each $set, $enabled in $google-font-subsets {
    @if $enabled {
      $subset: $subset + if($subset == '', '', ',') + $set;
    }
  }
  $subset: if(str-length($subset) > 0 and $subset != latin, '&subset=' + $subset, '');

  @if $name {
    //  replace name whitespaces
    $name: if(type-of($name) == string, unquote($name),$name);
    $name: __gf__str-replace(inspect($name),' ','+');
    //noinspection SassScssUnresolvedVariable
    @if $__gf__combine and not $text {
      //  add weights to combine map
      //noinspection SassScssUnresolvedVariable
      $wgt: map-get($__gf__map, $name) or ();
      $wgt: __gf__list-unique(join($wgt, $weights, comma));
      $__gf__map: map-merge($__gf__map, ($name: $wgt)) !global;
    } @else {
      //  create query
      $query: '';
      @each $weight in $weights { $query: $query + if($query != '', ',', '') + $weight; }
      $query: __gf__str-replace($query, ' ');
      $query: $name + if(str-length($query) > 0 and $query != '400',  ':'+ $query, '');

      //  create single immport
      @at-root { @import url($URL + $query + if($text, $text, '') + $subset); }
    }
  } @else {
    //  set combine flag
    $__gf__combine: true  !global;

    //  nested includes
    @content;

    //  convert combine map to query
    //  (remove weights if just 400)
    $query:'';
    @each $font, $weights in $__gf__map {
      $query: $query + if($query != '', '|', '') + $font +
                if(length($weights) == 1 and (nth($weights, 1) == '400'),
                '', ':' + join((), $weights, comma));
    }

    //  remove query whitespaces
    $query: __gf__str-replace($query,' ');

    //  create combined immport
    @at-root { @import url($URL + $query + $subset); }

    //  reset combine flag
    $__gf__combine: false !global;
  }
}
//
//  Helper functions
//
@function __gf__list-unique($list) {
  $result: ();
  @each $item in $list { @if not index($result, $item+''){ $result: append($result, $item+'');} }
  @each $item in $result { $result: set-nth($result, index($result, $item),unquote($item)); }
  @return $result;
}
@function __gf__str-replace($string, $search, $replace: '') {
  $index: str-index($string, $search);
  @return if($index,
          str-slice($string, 1, $index - 1) + $replace +
    __gf__str-replace(str-slice($string, $index +
    str-length($search)), $search, $replace),
          $string);
}
@function __gf__str-explode($string){
  $list:();
  @for $i from 1 through str-length($string) { $list: append($list, str-slice($string, $i, $i)); }
  @return $list;
}