//
// Copyright 2021 Google LLC
// SPDX-License-Identifier: Apache-2.0
//

// stylelint-disable selector-class-pattern --
// Selector '.md3-*' should only be used in this project.

// PUBLIC PROPERTIES

// go/keep-sorted start
@use 'sass:map';
// go/keep-sorted end
// go/keep-sorted start
@use '../../focus/focus-ring';
@use '../../sass/color';
@use '../../sass/shape';
@use '../../sass/theme';
@use '../../sass/touch-target';
@use '../../sass/var';
@use '../../tokens';
@use './handle';
@use './icon';
@use './track';
// go/keep-sorted end

$_forced-colors-theme: (
  disabled-selected-icon-color: GrayText,
  disabled-selected-icon-opacity: 1,
  disabled-selected-track-color: GrayText,
  disabled-track-opacity: 1,
  disabled-unselected-handle-color: GrayText,
  disabled-unselected-handle-opacity: 1,
  disabled-unselected-icon-color: Canvas,
  disabled-unselected-icon-opacity: 1,
  selected-focus-track-color: ButtonText,
  selected-hover-track-color: ButtonText,
  selected-icon-color: ButtonText,
  selected-pressed-track-color: ButtonText,
  selected-track-color: ButtonText,
  unselected-focus-handle-color: ButtonText,
  unselected-handle-color: ButtonText,
  unselected-hover-handle-color: ButtonText,
  unselected-icon-color: Canvas,
  unselected-pressed-handle-color: ButtonText,
);

@mixin theme($tokens) {
  $tokens: theme.validate-theme(tokens.md-comp-switch-values(), $tokens);
  $tokens: _flatten-disable-colors($tokens);
  $tokens: theme.create-theme-vars($tokens, 'switch');
  $tokens: shape.resolve-tokens($tokens, 'track-shape', 'handle-shape');

  @include theme.emit-theme-vars($tokens);
}

@mixin styles() {
  $tokens: tokens.md-comp-switch-values();
  $tokens: _flatten-disable-colors($tokens);
  $tokens: theme.create-theme-vars($tokens, 'switch');
  $tokens: shape.resolve-tokens($tokens, 'track-shape', 'handle-shape');

  :host {
    @each $token, $value in $tokens {
      --_#{$token}: #{$value};
    }

    // TODO(b/230630968): create a forced-colors-mode mixin
    @media screen and (forced-colors: active) {
      @include theme($_forced-colors-theme);
    }

    display: inline-flex;
    outline: none;
    vertical-align: top;
    -webkit-tap-highlight-color: transparent;
  }

  md-focus-ring {
    @include focus-ring.theme(
      (
        shape: (
          var(--_track-shape-start-start),
          var(--_track-shape-start-end),
          var(--_track-shape-end-start),
          var(--_track-shape-end-end),
        ),
      )
    );
  }

  .md3-switch {
    align-items: center;
    background: none;
    border: none;
    cursor: pointer;
    display: inline-flex;
    flex-shrink: 0; // Stop from collapsing in flex containers
    margin: 0;
    outline: none;
    padding: 0;
    position: relative;
    width: var(--_track-width);
    height: var(--_track-height);

    // Track shape
    border-start-start-radius: var(--_track-shape-start-start);
    border-start-end-radius: var(--_track-shape-start-end);
    border-end-end-radius: var(--_track-shape-end-end);
    border-end-start-radius: var(--_track-shape-end-start);
  }

  // Touch target
  .md3-switch__touch {
    @include touch-target.touch-target();
  }

  // Disabled
  .md3-switch:disabled {
    cursor: default;
    pointer-events: none;
  }

  // Disabled - Track
  .md3-switch__track {
    .md3-switch:disabled & {
      background-color: transparent;
      border-color: transparent;

      &::before {
        background-clip: content-box;
      }
    }
    .md3-switch--selected:disabled & {
      background-clip: border-box;
    }
  }

  @include track.styles();
  @include handle.styles();
  @include icon.styles();
}

@function _flatten-disable-colors($theme) {
  @return color.join-color-and-opacity-pairs(
    $theme,
    (
      // Disabled Handle
      (
          color-key: disabled-selected-handle-color,
          opacity-key: disabled-selected-handle-opacity
        ),
      (
        color-key: disabled-unselected-handle-color,
        opacity-key: disabled-unselected-handle-opacity
      ),
      // Disabled Track
      (
          color-key: disabled-selected-track-color,
          opacity-key: disabled-track-opacity
        ),
      (
        color-key: disabled-unselected-track-color,
        opacity-key: disabled-track-opacity
      ),
      (
        color-key: disabled-unselected-track-outline-color,
        opacity-key: disabled-track-opacity
      ),
      // Disabled Icon
      (
          color-key: disabled-selected-icon-color,
          opacity-key: disabled-selected-icon-opacity
        ),
      (
        color-key: disabled-unselected-icon-color,
        opacity-key: disabled-unselected-icon-opacity
      )
    )
  );
}