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

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

@use 'sass:map';
@use '../../elevationold/lib/surface' as elevation-surface;
@use '../../ripple/ripple-theme';
@use '../../sass/color';
@use '../../sass/dom';
@use '../../sass/typography';
@use '../../sass/resolvers';

@mixin styles() {
  :host {
    display: inline-flex;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    /**
     * Override vertical-align with shortest value "top". Vertical-align's default
     * "baseline" value causes buttons to be misaligned next to each other if one
     * button has an icon and the other does not.
     */
    vertical-align: top;

    @include ripple-theme.theme(
      (
        hover-state-layer-color: var(--_hover-state-layer-color),
        focus-state-layer-color: var(--_focus-state-layer-color),
        pressed-state-layer-color: var(--_pressed-state-layer-color),
        hover-state-layer-opacity: var(--_hover-state-layer-opacity),
        focus-state-layer-opacity: var(--_focus-state-layer-opacity),
        pressed-state-layer-opacity: var(--_pressed-state-layer-opacity),
      )
    );
  }

  :host([disabled]) {
    cursor: default;
    pointer-events: none;

    border-start-start-radius: var(
      --md-comp-button-shape-start-start,
      var(--md-comp-button-shape)
    );
  }

  .md3-button {
    @include elevation-surface.root-static-styles();

    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    min-inline-size: 64px;
    border: none;
    outline: none;
    line-height: inherit;
    user-select: none;
    -webkit-appearance: none;
    vertical-align: middle;
    background: transparent;
    text-decoration: none;
    inline-size: 100%;
    block-size: var(--_container-height);
    font-family: var(--_label-text-font);
    font-size: var(--_label-text-size);
    letter-spacing: var(--_label-text-tracking);
    font-weight: var(--_label-text-weight);
    background-color: var(--_container-color);
    color: var(--_label-text-color);
    // TODO(b/181413732): Verify token below are named correctly
    padding-inline-start: var(--_spacing-leading);
    padding-inline-end: var(--_spacing-trailing);

    &::-moz-focus-inner {
      padding: 0;
      border: 0;
    }

    &:hover {
      color: var(--_hover-label-text-color);
      cursor: pointer;
    }

    &:focus {
      color: var(--_focus-label-text-color);
    }

    &:active {
      color: var(--_pressed-label-text-color);
      outline: none;
    }

    &:disabled {
      background-color: var(--_disabled-container-color);
      color: var(--_disabled-label-text-color);
    }

    @media (forced-colors: active) {
      &::before {
        @include dom.transparent-border();
      }
    }
  }

  .md3-button,
  .md3-button__ripple {
    border-radius: var(--_container-shape);
  }

  .md3-button__ripple {
    z-index: -1; // Place behind content
  }

  // TODO(b/181413732): Verify token below are named correctly
  .md3-button--icon-leading {
    padding-inline-start: var(--_with-icon-spacing-leading);
    padding-inline-end: var(--_with-icon-spacing-trailing);
  }

  .md3-button--icon-trailing {
    padding-inline-start: var(--_with-trailing-icon-spacing-leading);
    padding-inline-end: var(--_with-trailing-icon-spacing-trailing);
  }

  .md3-link-button-wrapper {
    inline-size: 100%;
  }
}

@function flatten-disabled-colors($tokens) {
  @return color.join-color-and-opacity-pairs(
    $tokens,
    (
      (
        color-key: 'disabled-container-color',
        opacity-key: 'disabled-container-opacity'
      ),
      (
        color-key: 'disabled-label-text-color',
        opacity-key: 'disabled-label-text-opacity'
      ),
      (
        color-key: 'with-icon-disabled-icon-color',
        opacity-key: 'with-icon-disabled-icon-opacity'
      ),
      (
        color-key: 'disabled-outline-color',
        opacity-key: 'disabled-outline-opacity'
      )
    )
  );
}

@function remove-unsupported-tokens($tokens) {
  // b/193825150: Text and Outlined Button don't have `container-shadow-color`,
  // leaving `container-elevation` useless.
  @if not map.get($tokens, 'container-shadow-color') {
    $tokens: map.remove($tokens, 'container-elevation');
  }

  $unsupported-tokens: (
    // TODO(b/233225796): Clean up this removal of `dragged` tokens.
    'dragged-container-elevation',
    'dragged-label-text-color',
    'dragged-state-layer-color',
    'dragged-state-layer-opacity',
    'with-icon-dragged-icon-color',
    // b/189346077#comment2: `label-text-line-height` is included in token set
    // "just in case", but it's okay to ignore.
    'label-text-line-height',
    // b/203778922: `label-text-type` used by other platforms but not web.
    'label-text-type'
  );
  @return map.remove($tokens, $unsupported-tokens);
}