//
// 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';
// go/keep-sorted end
// go/keep-sorted start
@use '../../motion/animation';
@use '../../ripple/ripple';
@use '../../sass/color';
@use '../../sass/touch-target';
// go/keep-sorted end

@mixin styles() {
  @keyframes md3-segmented-button-checkmark-selection-draw-in {
    from {
      stroke-dashoffset: 29.7833385;
    }
    to {
      stroke-dashoffset: 0;
    }
  }

  @keyframes md3-segmented-button-simple-fade-out {
    from {
      opacity: 1;
    }
    to {
      opacity: 0;
    }
  }

  @keyframes md3-segmented-button-simple-fade-in {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

  :host {
    display: inline-flex;
    outline: none;
  }

  .md3-segmented-button {
    align-items: center;
    background: transparent;
    border: none;
    border-radius: inherit;
    display: flex;
    flex: 1;
    justify-content: center;
    outline: none;
    position: relative;
    vertical-align: middle;
    padding-inline-start: var(--_spacing-leading);
    padding-inline-end: var(--_spacing-trailing);

    .md3-segmented-button__outline {
      border-color: var(--_outline-color);
    }

    &:disabled .md3-segmented-button__outline {
      border-color: var(--_disabled-outline-color);
    }

    .md3-segmented-button__graphic,
    .md3-segmented-button__checkmark,
    .md3-segmented-button__icon,
    .md3-segmented-button__icon ::slotted([slot='icon']) {
      height: var(--_with-icon-icon-size);
      width: var(--_with-icon-icon-size);
      font-size: var(--_with-icon-icon-size);
    }

    // Under the following conditions, we need to account for extra space between
    // the graphic and the text label/icon content:
    //
    //   1. A button with an icon and a label.
    //   2. A selected button with a label and checkmark.
    //   3. A selected button with an icon and checkmark but no label.
    //
    // We calculate a larger width here instead of using padding or margin for
    // two main reasons:
    //
    //   1. We may need to transition between a zero width and an explicit width.
    //   2. Both margin and padding take up space when a node has child content
    //      even when a zero width is set and overflow is set to hidden.
    //
    // Because of those reasons, we calculate a new width with the given values.
    &.md3-segmented-button--with-icon.md3-segmented-button--with-label,
    &.md3-segmented-button--selected.md3-segmented-button--with-label.md3-segmented-button--with-checkmark,
    &.md3-segmented-button--selected.md3-segmented-button--without-label.md3-segmented-button--with-checkmark {
      .md3-segmented-button__graphic {
        // TODO(b/198759625): Use padding token instead of hardcoded 8px value.
        width: calc(var(--_with-icon-icon-size) + 8px);
      }
    }

    .md3-segmented-button__label-text {
      font: var(--_label-text-type);
    }

    &.md3-segmented-button--selected:enabled {
      .md3-segmented-button__label-text {
        color: var(--_selected-label-text-color);
      }

      &:hover {
        .md3-segmented-button__label-text {
          color: var(--_selected-hover-label-text-color);
        }
      }

      &:focus {
        .md3-segmented-button__label-text {
          color: var(--_selected-focus-label-text-color);
        }
      }

      &:active {
        .md3-segmented-button__label-text {
          color: var(--_selected-pressed-label-text-color);
        }
      }
    }

    &.md3-segmented-button--unselected:enabled {
      .md3-segmented-button__label-text {
        color: var(--_unselected-label-text-color);
      }

      &:hover {
        .md3-segmented-button__label-text {
          color: var(--_unselected-hover-label-text-color);
        }
      }

      &:focus {
        .md3-segmented-button__label-text {
          color: var(--_unselected-focus-label-text-color);
        }
      }

      &:active {
        .md3-segmented-button__label-text {
          color: var(--_unselected-pressed-label-text-color);
        }
      }
    }

    &:disabled {
      .md3-segmented-button__label-text {
        color: var(--_disabled-label-text-color);
      }
    }
  }

  .md3-segmented-button--unselected {
    .md3-segmented-button__icon {
      color: var(--_unselected-with-icon-icon-color);
    }

    &:hover {
      .md3-segmented-button__icon {
        color: var(--_unselected-hover-icon-color);
      }
    }

    &:focus {
      .md3-segmented-button__icon {
        color: var(--_unselected-focus-icon-color);
      }
    }

    &:active {
      .md3-segmented-button__icon {
        color: var(--_unselected-pressed-icon-color);
      }
    }

    &:disabled {
      .md3-segmented-button__icon {
        color: var(--_disabled-icon-color);
      }
    }

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

  .md3-segmented-button--selected {
    background-color: var(--_selected-container-color);

    .md3-segmented-button__icon {
      color: var(--_selected-with-icon-icon-color);
    }

    .md3-segmented-button__checkmark-path {
      stroke: var(--_selected-with-icon-icon-color);
    }

    &:hover {
      .md3-segmented-button__checkmark-path {
        stroke: var(--_selected-hover-icon-color);
      }
    }

    &:focus {
      .md3-segmented-button__checkmark-path {
        stroke: var(--_selected-focus-icon-color);
      }
    }

    &:active {
      .md3-segmented-button__checkmark-path {
        stroke: var(--_selected-pressed-icon-color);
      }
    }

    &:disabled {
      .md3-segmented-button__checkmark-path {
        stroke: var(--_disabled-icon-color);
      }
    }

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

  .md3-segmented-button:enabled {
    cursor: pointer;
  }

  .md3-segmented-button__focus-ring {
    z-index: 1;
  }

  .md3-segmented-button__ripple {
    border-radius: inherit;
    z-index: 0;
  }

  .md3-segmented-button__touch {
    @include touch-target.touch-target($width: 100%);
  }

  .md3-segmented-button__leading,
  .md3-segmented-button__graphic {
    display: inline-flex;
    justify-content: flex-start;
    align-items: center;
  }

  .md3-segmented-button__graphic {
    position: relative;
    overflow: hidden;
  }

  .md3-segmented-button__graphic {
    transition: animation.standard(width, 150ms);
  }

  .md3-segmented-button--unselected.md3-segmented-button--with-label,
  .md3-segmented-button--unselected.md3-segmented-button--without-label,
  .md3-segmented-button--selected.md3-segmented-button--without-checkmark {
    .md3-segmented-button__graphic {
      width: 0;
    }
  }

  .md3-segmented-button--unselected .md3-segmented-button__checkmark {
    opacity: 0;
  }

  .md3-segmented-button--selected.md3-segmented-button--with-label {
    .md3-segmented-button__icon {
      opacity: 0;
    }
  }

  .md3-segmented-button--with-label .md3-segmented-button__checkmark {
    display: inline-flex;
    position: absolute;
  }

  .md3-segmented-button__checkmark-path {
    stroke-width: 2px;
    stroke-dasharray: 29.7833385;
  }

  .md3-segmented-button--selecting {
    .md3-segmented-button__checkmark-path {
      // We immediately render the checkmark in the animation start treatment
      // because we're using an animation delay. If we didn't have the delay,
      // the checkmark would render in the base fully-drawn state during the
      // brief animation-delay period which would look wrong.
      stroke-dashoffset: 29.7833385;
      animation: md3-segmented-button-checkmark-selection-draw-in;
      animation-duration: 150ms;
      animation-delay: 50ms;
      animation-fill-mode: forwards;
      animation-timing-function: animation.$standard-easing;
    }
    &.md3-segmented-button--with-label .md3-segmented-button__icon {
      animation: md3-segmented-button-simple-fade-out;
      animation-duration: 75ms;
      animation-timing-function: linear;
      animation-fill-mode: forwards;
    }
  }

  .md3-segmented-button--deselecting {
    .md3-segmented-button__checkmark {
      animation: md3-segmented-button-simple-fade-out;
      animation-duration: 50ms;
      animation-timing-function: linear;
      animation-fill-mode: forwards;
    }
    &.md3-segmented-button--with-label .md3-segmented-button__icon {
      // We immediately render the icon in the animation start treatment
      // because we're using an animation delay. If we didn't have the delay,
      // the icon would render with full opacity during the brief
      // animation-delay period which would look wrong.
      opacity: 0;
      animation: md3-segmented-button-simple-fade-in;
      animation-delay: 50ms;
      animation-duration: 150ms;
      animation-timing-function: linear;
      animation-fill-mode: forwards;
    }
  }
}

@function resolve-tokens($tokens) {
  $tokens: _flatten-disabled-colors($tokens);
  @return $tokens;
}

@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: 'disabled-icon-color', opacity-key: 'disabled-icon-opacity'),
      (
        color-key: 'disabled-outline-color',
        opacity-key: 'disabled-outline-opacity'
      )
    )
  );
}