@use 'sass:map';
@use 'sass:list';
@use '../core/tokens/m3-utils';
@use '../core/theming/theming';
@use '../core/tokens/m3';

/// Generates custom tokens for the mat-list.
@function get-tokens($theme: m3.$sys-theme) {
  $system: m3-utils.get-system($theme);

  // list-item-container-color
  // This does not match the spec, which defines this to be `md.sys.color.surface`.
  // However, this interferes with the use case of placing a list on other components. For example,
  // the bottom sheets container color is `md.sys.color.surface-container-low`. Instead, allow the
  // list to just display the colors for its background.

  // list-item-leading-icon-size
  // Match spec, which has list-item-leading-icon-size of 24px.
  // Current version of tokens (0_161) has 18px.
  @return (
    base: (),
    color: (
      list-active-indicator-color: map.get($system, secondary-container),
      list-active-indicator-shape: map.get($system, corner-full),
      list-list-item-container-color: transparent,
      list-list-item-container-shape: map.get($system, corner-none),
      list-list-item-disabled-label-text-color: map.get($system, on-surface),
      list-list-item-disabled-label-text-opacity: 0.3,
      list-list-item-disabled-leading-icon-color: map.get($system, on-surface),
      list-list-item-disabled-leading-icon-opacity: 0.38,
      list-list-item-disabled-state-layer-color: map.get($system, on-surface),
      list-list-item-disabled-state-layer-opacity: map.get($system, focus-state-layer-opacity),
      list-list-item-disabled-trailing-icon-color: map.get($system, on-surface),
      list-list-item-disabled-trailing-icon-opacity: 0.38,
      list-list-item-focus-label-text-color: map.get($system, on-surface),
      list-list-item-focus-state-layer-color: map.get($system, on-surface),
      list-list-item-focus-state-layer-opacity: map.get($system, focus-state-layer-opacity),
      list-list-item-hover-label-text-color: map.get($system, on-surface),
      list-list-item-hover-state-layer-color: map.get($system, on-surface),
      list-list-item-hover-state-layer-opacity: map.get($system, hover-state-layer-opacity),
      list-list-item-label-text-color: map.get($system, on-surface),
      list-list-item-leading-avatar-color: map.get($system, primary-container),
      list-list-item-leading-avatar-shape: map.get($system, corner-full),
      list-list-item-leading-avatar-size: 40px,
      list-list-item-leading-icon-color: map.get($system, on-surface-variant),
      list-list-item-leading-icon-size: 24px,
      list-list-item-selected-trailing-icon-color: map.get($system, primary),
      list-list-item-supporting-text-color: map.get($system, on-surface-variant),
      list-list-item-trailing-icon-color: map.get($system, on-surface-variant),
      list-list-item-trailing-icon-size: 24px,
      list-list-item-trailing-supporting-text-color: map.get($system, on-surface-variant),
      list-list-item-selected-container-color: null,
      list-list-item-hover-leading-icon-color: null,
      list-list-item-hover-trailing-icon-color: null,
    ),
    typography: (
      list-list-item-label-text-font: map.get($system, body-large-font),
      list-list-item-label-text-line-height: map.get($system, body-large-line-height),
      list-list-item-label-text-size: map.get($system, body-large-size),
      list-list-item-label-text-tracking: map.get($system, body-large-tracking),
      list-list-item-label-text-weight: map.get($system, body-large-weight),
      list-list-item-supporting-text-font: map.get($system, body-medium-font),
      list-list-item-supporting-text-line-height: map.get($system, body-medium-line-height),
      list-list-item-supporting-text-size: map.get($system, body-medium-size),
      list-list-item-supporting-text-tracking: map.get($system, body-medium-tracking),
      list-list-item-supporting-text-weight: map.get($system, body-medium-weight),
      list-list-item-trailing-supporting-text-font: map.get($system, label-small-font),
      list-list-item-trailing-supporting-text-line-height:
          map.get($system, label-small-line-height),
      list-list-item-trailing-supporting-text-size: map.get($system, label-small-size),
      list-list-item-trailing-supporting-text-tracking: map.get($system, label-small-tracking),
      list-list-item-trailing-supporting-text-weight: map.get($system, label-small-weight),
    ),
    density: get-density-tokens(map.get($system, density-scale)),
  );
}

// Tokens that can be configured through Angular Material's density theming API.
@function get-density-tokens($scale) {
  $scale: theming.clamp-density($scale, -5);
  $index: ($scale * -1) + 1;

  @return (
    list-list-item-leading-icon-start-space: list.nth((16px, 12px, 8px, 4px, 4px, 4px), $index),
    list-list-item-leading-icon-end-space: list.nth((16px, 12px, 8px, 4px, 4px, 4px), $index),
    list-list-item-one-line-container-height:
        list.nth((48px, 44px, 40px, 36px, 32px, 24px), $index),
    list-list-item-two-line-container-height:
        list.nth((64px, 60px, 56px, 52px, 48px, 48px), $index),
    list-list-item-three-line-container-height:
        list.nth((88px, 84px, 80px, 76px, 72px, 56px), $index),
  );
}