@use 'sass:color';
@use 'sass:meta';
@use '../core/tokens/m2-utils';
@use '../core/theming/inspection';
@use '../core/style/sass-utils';

// Tokens that can't be configured through Angular Material's current theming API,
// but may be in a future version of the theming API.
@function get-unthemable-tokens() {
  @return ();
}

// Tokens that can be configured through Angular Material's color theming API.
@function get-color-tokens($theme) {
  $table-background: inspection.get-theme-color($theme, background, card);
  $text-color: inspection.get-theme-color($theme, foreground, secondary-text);
  $arrow-color: null;

  // Because the arrow is made up of multiple elements that are stacked on top of each other,
  // we can't use the semi-transparent color from the theme directly. If the value is a color
  // *type*, we convert it into a solid color by taking the opacity from the rgba value and
  // using the value to determine the percentage of the background to put into foreground
  // when mixing the colors together. Otherwise, if it resolves to something different
  // (e.g. it resolves to a CSS variable), we use the color directly.
  @if (meta.type-of($table-background) == color and meta.type-of($text-color) == color) {
    $text-opacity: color.opacity($text-color);
    $arrow-color: color.mix($table-background, rgba($text-color, 1), (1 - $text-opacity) * 100%);
  }
  @else {
    $arrow-color: $text-color;
  }

  @return (
    sort-arrow-color: $arrow-color,
  );
}

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

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

// 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(m2-utils.$placeholder-color-config),
      get-typography-tokens(m2-utils.$placeholder-typography-config),
      get-density-tokens(m2-utils.$placeholder-density-config)
  );
}