//
// Copyright IBM Corp. 2016, 2018
//
// This source code is licensed under the Apache-2.0 license found in the
// LICENSE file in the root directory of this source tree.
//

@use "../mixins" as *;
@use "../functions" as *;
@use "../../../breakpoint" as *;
@use "../../../config" as *;
@use "../../../motion" as *;
@use "../../../theme" as *;
@use "../../../type" as *;
@use "../../../utilities/button-reset";
@use "../../../utilities/convert" as *;
@use "../../../utilities/z-index" as *;

/// UI shell header
/// @access private
/// @group ui-shell
@mixin header {
  .#{$prefix}--header {
    position: fixed;
    z-index: z("header");
    top: 0;
    right: 0;
    left: 0;
    display: flex;
    height: mini-units(6);
    align-items: center;
    border-bottom: 1px solid $border-subtle;
    background-color: $background-main;
  }

  .#{$prefix}--header__action {
    @include button-reset.reset();

    width: mini-units(6);
    height: mini-units(6);
    border: calcRem(2px) solid transparent;
    transition: background-color $duration-fast-02,
      border-color $duration-fast-02;
  }

  .#{$prefix}--header__action
    > svg.#{$prefix}--navigation-menu-panel-collapse-icon,
  .#{$prefix}--header__action--active
    > svg.#{$prefix}--navigation-menu-panel-expand-icon {
    display: none;
  }

  .#{$prefix}--header__action--active
    > svg.#{$prefix}--navigation-menu-panel-collapse-icon {
    display: inline;
  }

  .#{$prefix}--header__action:hover {
    background-color: $background-hover;
  }

  .#{$prefix}--header__action--active {
    border-right: 1px solid $border-subtle;
    border-bottom: 1px solid transparent;
    border-left: 1px solid $border-subtle;
    background: $layer-primary;
  }

  .#{$prefix}--header__action--active > svg {
    fill: $icon-primary;
  }

  .#{$prefix}--header__action:focus {
    border-color: $focus;
    outline: none;
  }

  .#{$prefix}--header__action:active {
    background-color: $background-active;
  }

  .#{$prefix}--header__action.#{$prefix}--btn--icon-only.#{$prefix}--tooltip__trigger {
    justify-content: center;
  }

  .#{$prefix}--btn.#{$prefix}--btn--icon-only.#{$prefix}--tooltip__trigger.#{$prefix}--header__action
    svg {
    fill: $icon-secondary;
  }

  .#{$prefix}--btn.#{$prefix}--btn--icon-only.#{$prefix}--tooltip__trigger.#{$prefix}--header__action:hover
    svg,
  .#{$prefix}--btn.#{$prefix}--btn--icon-only.#{$prefix}--tooltip__trigger.#{$prefix}--header__action:active
    svg,
  .#{$prefix}--btn.#{$prefix}--btn--icon-only.#{$prefix}--tooltip__trigger.#{$prefix}--header__action--active
    svg {
    fill: $icon-primary;
  }

  .#{$prefix}--header__menu-trigger > svg {
    fill: $icon-primary;
  }

  .#{$prefix}--header__menu-trigger:hover > svg {
    fill: $icon-primary;
    //TO-DO: ask design if this color changes on hover, missing spec for it
  }

  .#{$prefix}--header__menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .#{$prefix}--header__menu-toggle__hidden {
    @include breakpoint("lg") {
      display: none;
    }
  }

  //--------------------------------------------------------------------------
  // Header - Name
  //--------------------------------------------------------------------------
  a.#{$prefix}--header__name {
    @include type-style("body-short");

    display: flex;
    height: 100%;
    align-items: center;
    padding: 0 mini-units(4) 0 mini-units(2);
    border: calcRem(2px) solid transparent;
    font-weight: 600;
    letter-spacing: 0.1px;
    line-height: 1.25rem;
    outline: none;
    text-decoration: none;
    transition: border-color $duration-fast-02;
    user-select: none;
  }

  a.#{$prefix}--header__name:focus {
    border-color: $focus;
    //TO-DO: follow up with design to see if this is correct, missing focus spec for it
  }

  .#{$prefix}--header__name--prefix {
    font-weight: 400;
  }

  a.#{$prefix}--header__name,
  a.#{$prefix}--header__name:hover {
    color: $text-body-default;
  }

  .#{$prefix}--header__menu-toggle:not(.#{$prefix}--header__menu-toggle__hidden)
    ~ .#{$prefix}--header__name {
    padding-left: calcRem(8px);
  }

  //--------------------------------------------------------------------------
  // Header - Navigation
  //--------------------------------------------------------------------------
  .#{$prefix}--header__nav {
    position: relative;
    display: none;
    height: 100%;
    padding-left: mini-units(2);

    @include breakpoint("lg") {
      display: block;
    }

    // header nav divider
    &::before {
      position: absolute;
      top: 50%;
      left: 0;
      display: block;
      width: calcRem(1px);
      height: calcRem(24px);
      background-color: $border-subtle;
      content: "";
      transform: translateY(-50%);
    }
  }

  .#{$prefix}--header__menu-bar {
    display: flex;
    height: 100%;
    padding: 0;
    margin: 0;
    list-style: none;
  }

  a.#{$prefix}--header__menu-item {
    position: relative;
    display: flex;
    // Used for links that are directly in the menubar to span the full height
    height: 100%;
    align-items: center;
    padding: 0 mini-units(2);
    // Used for focus styles
    border: 2px solid transparent;
    background-color: $background-main;
    color: $text-body-secondary;
    // Text styles
    font-size: calcRem(14px);
    font-weight: 400;
    letter-spacing: 0;
    line-height: 1.125rem;
    // Reset link styles and make sure the text isn't selectable
    text-decoration: none;
    transition: background-color $duration-fast-02,
      border-color $duration-fast-02, color $duration-fast-02;
    user-select: none;
  }

  a.#{$prefix}--header__menu-item:hover {
    background-color: $background-hover;
    color: $text-body-default;
  }

  .#{$prefix}--header__action:active,
  a.#{$prefix}--header__menu-item:active {
    background-color: $background-active;
    color: $text-body-default;
  }

  a.#{$prefix}--header__menu-item:focus {
    border-color: $focus;
    outline: none;
  }

  a.#{$prefix}--header__menu-item:hover > svg,
  a.#{$prefix}--header__menu-item:active > svg {
    fill: $icon-primary;
  }

  // Styles for selected state

  a.#{$prefix}--header__menu-item[aria-current="page"],
  .#{$prefix}--header__menu-item--current {
    color: $text-body-default;
  }

  a.#{$prefix}--header__menu-item[aria-current="page"]::after,
  .#{$prefix}--header__menu-item--current::after {
    position: absolute;
    top: 0;
    right: 0;
    bottom: -2px;
    left: 0;
    width: 100%;
    border-bottom: 3px solid $border-interactive;
    content: "";
  }

  a.#{$prefix}--header__menu-item[aria-current="page"]:focus::after,
  .#{$prefix}--header__menu-item--current:focus::after {
    border: 0;
  }

  a.#{$prefix}--header__menu-item[aria-current="page"]:focus,
  a.#{$prefix}--header__menu-item.#{$prefix}--header__menu-item--current:focus {
    border: 2px solid $focus;
  }

  .#{$prefix}--header__submenu {
    position: relative;
  }

  .#{$prefix}--header__menu-title[aria-haspopup="true"] {
    position: relative;
  }

  .#{$prefix}--header__menu-title[aria-expanded="true"] {
    // Note: needs to be higher than menu. Adding 1 here instead of moving to
    // the next level.
    z-index: #{z("header") + 1};
    background-color: $layer-primary;
    color: $text-body-secondary;
  }

  .#{$prefix}--header__menu-title[aria-expanded="true"]
    > .#{$prefix}--header__menu-arrow {
    transform: rotate(180deg);
  }

  .#{$prefix}--header__menu {
    display: none;
    padding: 0;
    margin: 0;
    list-style: none;
  }

  .#{$prefix}--header__menu-title[aria-expanded="true"]
    + .#{$prefix}--header__menu {
    position: absolute;
    z-index: z("header");
    bottom: 0;
    left: 0;
    display: flex;
    width: mini-units(25);
    flex-direction: column;
    background-color: $layer-primary;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.5);
    transform: translateY(100%);
  }

  .#{$prefix}--header__menu-title[aria-expanded="true"]
    + .#{$prefix}--header__menu
    .#{$prefix}--header__menu-item {
    background-color: $layer-primary;
  }

  .#{$prefix}--header__menu-title[aria-expanded="true"]
    + .#{$prefix}--header__menu
    .#{$prefix}--header__menu-item:hover {
    background-color: $layer-hover;
    color: $text-body-default;
  }

  .#{$prefix}--header__menu-title[aria-expanded="true"]
    + .#{$prefix}--header__menu
    .#{$prefix}--header__menu-item:active {
    background-color: $layer-active;
    color: $text-body-default;
  }

  .#{$prefix}--header__menu .#{$prefix}--header__menu-item {
    height: mini-units(6);
  }

  .#{$prefix}--header__menu-arrow {
    margin-left: mini-units(1);
    fill: $icon-secondary;
    transition: transform $duration-fast-02, fill $duration-fast-02;
  }

  //--------------------------------------------------------------------------
  // Header - Global
  //--------------------------------------------------------------------------
  .#{$prefix}--header__global {
    display: flex;
    height: 100%;
    flex: 1 1 0%;
    justify-content: flex-end;
  }

  //--------------------------------------------------------------------------
  // Header - Skip to content
  //--------------------------------------------------------------------------
  .#{$prefix}--skip-to-content {
    position: absolute;
    overflow: hidden;
    width: 1px;
    height: 1px;
    padding: 0;
    border: 0;
    margin: -1px;
    clip: rect(0, 0, 0, 0);
    visibility: inherit;
    white-space: nowrap;
  }

  .#{$prefix}--skip-to-content:focus {
    z-index: 9999;
    top: 0;
    left: 0;
    display: flex;
    width: auto;
    height: 3rem;
    align-items: center;
    padding: 0 1rem;
    border: 4px solid $focus;
    background-color: $background-main;
    clip: auto;
    color: $text-body-secondary;
    //TO-DO: double check with design that these tokens are correct, missing spec for it
    outline: none;
  }
}