@use 'sass:map';
@use '../../../theming/palette';
@use '../../../theming/theming';
@use '../../../style/sass-utils';
@use '../../token-utils';
@use '@material/theme/theme-color' as mdc-theme-color;

// The prefix used to generate the fully qualified name for tokens in this file.
$prefix: (mdc, checkbox);

// MDC logs a warning if the `contrast-tone` function is called with a CSS variable.
// This function falls back to determining the tone based on whether the theme is light or dark.
@function _contrast-tone($value, $is-dark, $light-color: '#fff', $dark-color: '#000') {
  @if ($value == 'dark' or $value == 'light' or type-of($value) == 'color') {
    @return if(mdc-theme-color.contrast-tone($value) == 'dark', $dark-color, $light-color);
  }

  @return if($is-dark, $light-color, $dark-color);
}

// Tokens that can't be configured through Angular Material's current theming API,
// but may be in a future version of the theming API.
//
// Tokens that are available in MDC, but not used in Angular Material should be mapped to `null`.
// `null` indicates that we are intentionally choosing not to emit a slot or value for the token in
// our CSS.
@function get-unthemable-tokens() {
  @return (
    // The color of the checkmark when the checkbox is selected and disabled.
    disabled-selected-checkmark-color: #fff,
    // The opacity of the ripple when the checkbox is selected and focused.
    selected-focus-state-layer-opacity: 0.16,
    // The opacity of the ripple when the checkbox is selected and hovered.
    selected-hover-state-layer-opacity: 0.04,
    // The opacity of the ripple when the checkbox is selected and pressed.
    selected-pressed-state-layer-opacity: 0.16,
    // The opacity of the ripple when the checkbox is unselected and focused.
    unselected-focus-state-layer-opacity: 0.16,
    // The opacity of the ripple when the checkbox is unselected and hovered.
    unselected-hover-state-layer-opacity: 0.04,
    // The opacity of the ripple when the checkbox is unselected and pressed.
    unselected-pressed-state-layer-opacity: 0.16,
    // =============================================================================================
    // = TOKENS NOT USED IN ANGULAR MATERIAL                                                       =
    // =============================================================================================
    // MDC currently doesn't output a slot for these tokens.
    disabled-selected-icon-opacity: null,
    disabled-unselected-icon-opacity: null,
  );
}

// Tokens that can be configured through Angular Material's color theming API.
@function get-color-tokens($config) {
  $foreground: map.get($config, foreground);
  $accent: map.get($config, accent);
  $is-dark: map.get($config, is-dark);
  $foreground-base: theming.get-color-from-palette($foreground, base);
  $accent-default: theming.get-color-from-palette($accent, default);
  $disabled-color: theming.get-color-from-palette($foreground, base, 0.38);
  $selected-color: theming.get-color-from-palette($accent);
  $border-color: theming.get-color-from-palette($foreground, base, 0.54);
  $active-border-color:
    theming.get-color-from-palette(palette.$gray-palette, if($is-dark, 200, 900));

  @return (
    // The color of the checkbox fill when the checkbox is selected and disabled.
    disabled-selected-icon-color: $disabled-color,
    // The color of the checkbox border when the checkbox is unselected and disabled.
    disabled-unselected-icon-color: $disabled-color,
    // The color of the checkmark when the checkbox is selected.
    selected-checkmark-color: _contrast-tone($selected-color, $is-dark),
    // The color of the checkbox fill when the checkbox is selected and focused.
    selected-focus-icon-color: $selected-color,
    // The color of the checkbox fill when the checkbox is selected and hovered.
    selected-hover-icon-color: $selected-color,
    // The color of the checkbox fill when the checkbox is selected.
    selected-icon-color: $selected-color,
    // The color of the checkbox fill when the checkbox is selected an pressed.
    selected-pressed-icon-color: $selected-color,
    // The color of the checkbox border when the checkbox is unselected and focused.
    unselected-focus-icon-color: $active-border-color,
    // The color of the checkbox border when the checkbox is unselected and hovered.
    unselected-hover-icon-color: $active-border-color,
    // The color of the checkbox border when the checkbox is unselected.
    unselected-icon-color: $border-color,
    // The color of the checkbox border when the checkbox is unselected and pressed.
    unselected-pressed-icon-color: $border-color,
    // The color of the ripple when the checkbox is selected and focused.
    selected-focus-state-layer-color: $accent-default,
    // The color of the ripple when the checkbox is selected and hovered.
    selected-hover-state-layer-color: $accent-default,
    // The color of the ripple when the checkbox is selected and pressed.
    selected-pressed-state-layer-color: $accent-default,
    // The color of the ripple when the checkbox is unselected and focused.
    unselected-focus-state-layer-color: $foreground-base,
    // The color of the ripple when the checkbox is unselected and hovered.
    unselected-hover-state-layer-color: $foreground-base,
    // The color of the ripple when the checkbox is unselected and pressed.
    unselected-pressed-state-layer-color: $foreground-base,
  );
}

// Tokens that can be configured through Angular Material's typography theming API.
@function get-typography-tokens($config) {
  @return ();
}

// Tokens that can be configured through Angular Material's density theming API.
@function get-density-tokens($config) {
  $scale: theming.clamp-density($config, -3);

  @return (
    // The diameter of the checkbox's ripple.
    state-layer-size: map.get((
      0: 40px,
      -1: 36px,
      -2: 32px,
      -3: 28px,
    ), $scale)
  );
}

// Combines the tokens generated by the above functions into a single map with placeholder values.
// This is used to create token slots.
@function get-token-slots() {
  @return sass-utils.deep-merge-all(
      get-unthemable-tokens(),
      get-color-tokens(token-utils.$placeholder-color-config),
      get-typography-tokens(token-utils.$placeholder-typography-config),
      get-density-tokens(token-utils.$placeholder-density-config)
  );
}