//
// Copyright 2022 Google LLC
// SPDX-License-Identifier: Apache-2.0
//

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

// go/keep-sorted start
@use 'sass:map';
@use 'sass:meta';
// go/keep-sorted end
// go/keep-sorted start
@use '../../elevation/lib/elevation';
@use '../../focus/focus-ring';
@use '../../ripple/ripple';
@use '../../sass/shape';
@use '../../sass/theme';
@use '../../sass/touch-target';
// go/keep-sorted end

@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;
  }

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

  .md3-fab {
    display: inline-flex;
    border: none;
    outline: none;
    user-select: none;
    -webkit-appearance: none;
    vertical-align: middle;
    text-decoration: none;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 0; // Needed for elevation and ripple
    background-color: var(--_container-color);

    @include focus-ring.theme(
      (
        shape: shape.corners-to-shape-token(--_container-shape),
      )
    );

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

    @include elevation.theme(
      (
        // TODO: replace duration with animation tokens
        duration: 280ms,
        level: var(--_container-elevation),
        shadow-color: var(--_container-shadow-color),
        surface-tint: var(--_container-surface-tint-layer-color)
      )
    );

    &.md3-fab--lowered {
      @include elevation.theme(
        (
          level: var(--_lowered-container-elevation),
        )
      );
    }

    // apply elevation in order of focused, hovered, pressed
    // this ensures a button will have hover elevation after being focused
    &:focus {
      @include elevation.theme(
        (
          level: var(--_focus-container-elevation),
        )
      );

      &.md3-fab--lowered {
        @include elevation.theme(
          (
            level: var(--_lowered-focus-container-elevation),
          )
        );
      }
    }

    &:hover {
      cursor: pointer;

      @include elevation.theme(
        (
          level: var(--_hover-container-elevation),
        )
      );

      &.md3-fab--lowered {
        @include elevation.theme(
          (
            level: var(--_lowered-hover-container-elevation),
          )
        );
      }
    }

    &:active {
      outline: none;

      @include elevation.theme(
        (
          level: var(--_pressed-container-elevation),
        )
      );

      &.md3-fab--lowered {
        @include elevation.theme(
          (
            level: var(--_lowered-pressed-container-elevation),
          )
        );
      }
    }
  }

  md-elevation {
    inset: 0;
    position: absolute;
    z-index: -1; // Place behind content
  }

  .md3-fab__ripple {
    overflow: hidden;
    z-index: -1; // Place behind content
  }

  .md3-fab,
  .md3-fab__ripple {
    border-start-start-radius: var(--_container-shape-start-start);
    border-start-end-radius: var(--_container-shape-start-end);
    border-end-start-radius: var(--_container-shape-end-start);
    border-end-end-radius: var(--_container-shape-end-end);
  }

  .md3-fab__icon {
    display: inline-flex;
  }

  .md3-fab__touch {
    @include touch-target.touch-target();
  }

  .md3-fab__icon ::slotted(*),
  .md3-fab__icon {
    color: var(--_icon-color);
    font-size: var(--_icon-size);
    height: var(--_icon-size);
    width: var(--_icon-size);

    .md3-fab:hover & {
      color: var(--_hover-icon-color);
    }

    .md3-fab:focus & {
      color: var(--_focus-icon-color);
    }

    .md3-fab:active & {
      color: var(--_pressed-icon-color);
    }
  }

  @media (forced-colors: active) {
    .md3-fab {
      // Adjust the focus ring padding to account for the 1px border in HCM.
      @include focus-ring.theme(
        (
          offset-vertical: 3px,
          offset-horizontal: 3px,
        )
      );
      border: 1px solid ButtonText;
    }
  }
}

@function resolve-tokens($tokens) {
  $tokens: elevation.resolve-tokens(
    $tokens,
    'container-elevation',
    'focus-container-elevation',
    'hover-container-elevation',
    'pressed-container-elevation',
    'lowered-container-elevation',
    'lowered-focus-container-elevation',
    'lowered-hover-container-elevation',
    'lowered-pressed-container-elevation'
  );

  @return $tokens;
}