// https://github.com/pentzzsolt/sass-recursive-map-merge/issues/12

// Add small helper function
@function convert-empty-list-to-map($source) {
  @if ( type-of($source) == list and length($source) == 0 ) {
    @return map-remove((x:x), x);
  }
  @return $source;
};

// Updated function
@function r-map-merge($source1, $source2 ) {
  @if ( type-of($source1) == map or ( type-of($source1) == list and length($source1) == 0) ) and
      ( type-of($source2) == map or ( type-of($source2) == list and length($source2) == 0) ) {

    // Check both maps and convert to [map] when empty
    $map1: convert-empty-list-to-map($source1);
    $map2: convert-empty-list-to-map($source2);

    $result: $map1;

    @each $key, $value in $map2 {
      // Check both childs and convert to map when empty
      $map1-child: convert-empty-list-to-map(map-get($map1, $key));
      $map2-child: convert-empty-list-to-map($value);

      @if ( type-of($map1-child) == map and type-of($map2-child) == map ) {
        $result: map-merge($result, ($key: r-map-merge($map1-child, $map2-child)));
      }
      @else {
        $result: map-merge($result, ($key: $value));
      }
    }

    @return $result;
  }
  @else {
    @warn "recursive-map-merge() expects it\'s parameters to be map types!";
    @return null;
  }
}

/// Map deep get
/// @access public
/// @param {Map} $map - Map
/// @param {Arglist|list} $keys - Key chain
/// @return {*} - Desired value

@function map-deep-get($map, $keys...) {

  @if length($keys) == 1 and (type_of(nth($keys, 1)) == list or type_of(nth($keys, 1) == arglist )) {
    $keys: nth($keys, 1);
  }

  @each $key in $keys {
    @if map-has-key($map, $key) {
      $map: map-get($map, $key);
    } @else {
      @return null;
    }
  }
  @return $map;
}