// Utility for fetching a nested value from a typography config.
@function _mat-get-type-value($config, $level, $name) {
  @return map-get(map-get($config, $level), $name);
}

// Gets the font size for a level inside a typography config.
@function mat-font-size($config, $level) {
  @return _mat-get-type-value($config, $level, font-size);
}

// Gets the line height for a level inside a typography config.
@function mat-line-height($config, $level) {
  @return _mat-get-type-value($config, $level, line-height);
}

// Gets the font weight for a level inside a typography config.
@function mat-font-weight($config, $level) {
  @return _mat-get-type-value($config, $level, font-weight);
}

// Gets the letter spacing for a level inside a typography config.
@function mat-letter-spacing($config, $level) {
  @return _mat-get-type-value($config, $level, letter-spacing);
}

// Gets the font-family from a typography config and removes the quotes around it.
@function mat-font-family($config, $level: null) {
  $font-family: map-get($config, font-family);

  @if $level != null {
    $font-family: _mat-get-type-value($config, $level, font-family);
  }

  // Guard against unquoting non-string values, because it's deprecated.
  @return if(type-of($font-family) == string, unquote($font-family), $font-family);
}

// Outputs the shorthand `font` CSS property, based on a set of typography values. Falls back to
// the individual properties if a value that isn't allowed in the shorthand is passed in.
@mixin mat-typography-font-shorthand($font-size, $font-weight, $line-height, $font-family) {
  // If any of the values are set to `inherit`, we can't use the shorthand
  // so we fall back to passing in the individual properties.
  @if ($font-size == inherit or
       $font-weight == inherit or
       $line-height == inherit or
       $font-family == inherit or
       $font-size == null or
       $font-weight == null or
       $line-height == null or
       $font-family == null) {

    font-size: $font-size;
    font-weight: $font-weight;
    line-height: $line-height;
    font-family: $font-family;
  }
  @else {
    // Otherwise use the shorthand `font`, because it's the least amount of bytes. Note
    // that we need to use interpolation for `font-size/line-height` in order to prevent
    // Sass from dividing the two values.
    font: $font-weight #{$font-size}/#{$line-height} $font-family;
  }
}

// Converts a typography level into CSS styles.
@mixin mat-typography-level-to-styles($config, $level) {
  $font-size: mat-font-size($config, $level);
  $font-weight: mat-font-weight($config, $level);
  $line-height: mat-line-height($config, $level);
  $font-family: mat-font-family($config, $level);

  @include mat-typography-font-shorthand($font-size, $font-weight, $line-height, $font-family);
  letter-spacing: mat-letter-spacing($config, $level);
}