@use 'sass:map';
@use 'sass:meta';
@use 'sass:string';

/// Emits CSS styles for the given typography level.
/// @param {Map} $config A typography config.
/// @param {Map} $level A typography level.
@mixin typography-level($config, $level) {
  // we deliberately do not use the font shorthand here because it overrides
  // certain font properties that can't be configured in the current typography
  // config, e.g. the font-variant-caps or font-feature-settings property
  font-size: font-size($config, $level);
  font-weight: font-weight($config, $level);
  line-height: line-height($config, $level);
  font-family: font-family($config, $level);
  letter-spacing: letter-spacing($config, $level);
}

// Utility for fetching a nested value from a typography config.
@function _mat-get-type-value($config, $level, $name) {
  @if meta.type-of($config) != 'map' {
    @error 'Typography config must be a map. Received #{meta.type-of($config)}.';
  }

  @if not map.has-key($config, $level) {
    @error 'Typography config does not have a level called "#{$level}". ' +
           'Available levels are: #{map.keys($config)}.';
  }

  @return map.get(map.get($config, $level), $name);
}

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

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

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

/// Gets the letter spacing for a level inside a typography config.
/// @param {Map} $config A typography config.
/// @param {Map} $level A typography level.
@function letter-spacing($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.
/// @param {Map} $config A typography config.
/// @param {Map} $level A typography level.
@function font-family($config, $level: null) {
  @if meta.type-of($config) != 'map' {
    @error 'Typography config must be a map. Received #{meta.type-of($config)}.';
  }

  $font-family: map.get($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.
  @if (meta.type-of($font-family) == string) {
    $font-family: string.unquote($font-family);
  }

  @return $font-family;
}