@use '../core/style/variables';
@use '../core/style/private';
@use '../core/style/vendor-prefixes';
@use '../../cdk/a11y';

$tab-bar-height: 48px !default;
$tab-animation-duration: 500ms !default;

// Mixin styles for labels that are contained within the tab header.
@mixin tab-label {
  height: $tab-bar-height;
  padding: 0 24px;
  cursor: pointer;
  box-sizing: border-box;
  opacity: 0.6;
  min-width: 160px;
  text-align: center;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  white-space: nowrap;

  &:focus {
    outline: none;

    &:not(.mat-tab-disabled) {
      opacity: 1;
    }

    @include a11y.high-contrast(active, off) {
      $outline-width: 2px;
      outline: dotted $outline-width;
      outline-offset: -$outline-width; // Not supported on IE, but looks better everywhere else.
    }
  }

  &.mat-tab-disabled {
    cursor: default;

    @include a11y.high-contrast(active, off) {
      opacity: 0.5;
    }
  }

  .mat-tab-label-content {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    white-space: nowrap;
  }

  @include a11y.high-contrast(active, off) {
    opacity: 1;
  }
}

// The ink bar that displays under the active tab label
@mixin ink-bar {
  $height: 2px;

  @include private.private-animation-noop();
  position: absolute;
  bottom: 0;
  height: $height;
  transition: $tab-animation-duration variables.$ease-in-out-curve-function;

  .mat-tab-group-inverted-header & {
    bottom: auto;
    top: 0;
  }

  @include a11y.high-contrast(active, off) {
    outline: solid $height;
    height: 0;
  }
}

// Structural styles for a tab header. Used by both `mat-tab-header` and `mat-tab-nav-bar`.
@mixin paginated-tab-header {
  .mat-tab-header {
    display: flex;
    overflow: hidden;
    position: relative;
    flex-shrink: 0;
  }

  .mat-tab-header-pagination {
    @include vendor-prefixes.user-select(none);
    position: relative;
    display: none;
    justify-content: center;
    align-items: center;
    min-width: 32px;
    cursor: pointer;
    z-index: 2;
    -webkit-tap-highlight-color: transparent;
    touch-action: none;

    .mat-tab-header-pagination-controls-enabled & {
      display: flex;
    }
  }

  // The pagination control that is displayed on the left side of the tab header.
  .mat-tab-header-pagination-before, .mat-tab-header-rtl .mat-tab-header-pagination-after {
    padding-left: 4px;
    .mat-tab-header-pagination-chevron {
      transform: rotate(-135deg);
    }
  }

  // The pagination control that is displayed on the right side of the tab header.
  .mat-tab-header-rtl .mat-tab-header-pagination-before, .mat-tab-header-pagination-after {
    padding-right: 4px;
    .mat-tab-header-pagination-chevron {
      transform: rotate(45deg);
    }
  }

  .mat-tab-header-pagination-chevron {
    border-style: solid;
    border-width: 2px 2px 0 0;
    content: '';
    height: 8px;
    width: 8px;
  }

  .mat-tab-header-pagination-disabled {
    box-shadow: none;
    cursor: default;
  }

  .mat-tab-list {
    flex-grow: 1;
    position: relative;
    transition: transform 500ms cubic-bezier(0.35, 0, 0.25, 1);
  }
}

// Structural styles for the element that wraps the paginated header items.
@mixin paginated-tab-header-item-wrapper($parent) {
  display: flex;

  // We need to set the parent here explicitly, in order to prevent the alignment
  // from any parent tab groups from propagating down to the children when nesting.
  [mat-align-tabs='center'] > #{$parent} & {
    justify-content: center;
  }

  [mat-align-tabs='end'] > #{$parent} & {
    justify-content: flex-end;
  }
}

@mixin paginated-tab-header-container {
  display: flex;
  flex-grow: 1;
  overflow: hidden;
  z-index: 1;
}