//
// Copyright 2019 Stijn de Witt. Some rights reserved.
// Licensed under the MIT Open Source license. 
// https://opensource.org/licenses/MIT
// See LICENSE for details.
//
// Based on code copyright 2018 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0.
// http://www.apache.org/licenses/LICENSE-2.0
// See LICENSE-MDC for details.
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under these licenses is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the licenses for the specific language governing permissions and
// limitations under these licenses.
// 

@function typography-get-global-variable_($style) {
  @if $style == "headline1" {
    @return $typography-styles-headline1;
  } @else if $style == "headline2" {
    @return $typography-styles-headline2;
  } @else if $style == "headline3" {
    @return $typography-styles-headline3;
  } @else if $style == "headline4" {
    @return $typography-styles-headline4;
  } @else if $style == "headline5" {
    @return $typography-styles-headline5;
  } @else if $style == "headline6" {
    @return $typography-styles-headline6;
  } @else if $style == "subtitle1" {
    @return $typography-styles-subtitle1;
  } @else if $style == "subtitle2" {
    @return $typography-styles-subtitle2;
  } @else if $style == "body1" {
    @return $typography-styles-body1;
  } @else if $style == "body2" {
    @return $typography-styles-body2;
  } @else if $style == "caption" {
    @return $typography-styles-caption;
  } @else if $style == "button" {
    @return $typography-styles-button;
  } @else if $style == "overline" {
    @return $typography-styles-overline;
  } @else {
    @return ();
  }
}

@function typography-set-styles_($base-styles, $scale-styles) {
  @each $style, $style-props in $scale-styles {

    // Merge base properties for all styles.
    $style-props: map-merge($base-styles, $style-props);

    // Merge global overrides onto each style.
    @if global_variable_exists(typography-styles-#{$style}) {
      $style-props: map-merge($style-props, typography-get-global-variable_(#{$style}));
    }

    // Override original styles with new styles.
    $scale-styles: map-merge($scale-styles, (#{$style}: $style-props));
  }

  @return $scale-styles;
}

@function typography-get-letter-spacing_($tracking, $font-size) {
  @return $tracking / ($font-size * 16) * 1em;
}