//
// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

@import "./variables";

// Applies the correct theme color style to the specified property.
// $property is typically color or background-color, but can be any CSS property that accepts color values.
// $style should be one of the map keys in $mdc-theme-property-values (_variables.scss).
@mixin mdc-theme-prop($property, $style, $important: false) {
  @if not map-has-key($mdc-theme-property-values, $style) {
    @error "Invalid style: '#{$style}'. Choose one of: #{map-keys($mdc-theme-property-values)}";
  }

  @if $important {
    /* @alternate */
    #{$property}: map-get($mdc-theme-property-values, $style) !important;
    #{$property}: var(--mdc-theme-#{$style}, map-get($mdc-theme-property-values, $style)) !important;
  }

  @else {
    /* @alternate */
    #{$property}: map-get($mdc-theme-property-values, $style);
    #{$property}: var(--mdc-theme-#{$style}, map-get($mdc-theme-property-values, $style));
  }
}

// Creates a rule to be used in MDC-Web components for dark theming, and applies the provided contents.
// Should provide the $root-selector option if applied to anything other than the root selector.
// When used with a modifier class, provide a second argument of `true` for the $compound parameter
// to specify that this should be attached as a compound class.
//
// Usage example:
//
// ```scss
// .mdc-foo {
//   color: black;
//
//   @include mdc-theme-dark {
//     color: white;
//   }
//
//   &__bar {
//     background: black;
//
//     @include mdc-theme-dark(".mdc-foo") {
//       background: white;
//     }
//   }
// }
//
// .mdc-foo--disabled {
//   opacity: .38;
//
//   @include mdc-theme-dark(".mdc-foo", true) {
//     opacity: .5;
//   }
// }
// ```
@mixin mdc-theme-dark($root-selector: null, $compound: false) {
  @if ($root-selector) {
    @at-root {
      @if ($compound) {
        #{$root-selector}--theme-dark#{&},
        .mdc-theme--dark & {
          @content;
        }
      }

      @else {
        #{$root-selector}--theme-dark &,
        .mdc-theme--dark & {
          @content;
        }
      }
    }
  }

  @else {
    &--theme-dark,
    .mdc-theme--dark & {
      @content;
    }
  }
}