{%- comment -%}
  Include as: {%- include css/activation.scss.liquid -%}
  Depends on: page, site.
  Results in: page-dependent SCSS rules for inclusion in a head style element.
  Includes:
    sorted_pages.html.
  Overwrites: 
    activation_pages, activation_pages_top_size, activation_page, activation_title,
    activation_first_level, activation_second_level, activation_third_level,
    activation_first_level_reversed, activation_second_level_reversed,
    activation_first_level_index, activation_second_level_index, activation_third_level_index.
  Should not be cached, because it depends on page.
  (For a site with only top-level pages, the rendering of this file is always empty.
  This property could be detected, and might halve the build time for such sites.)
{%- endcomment -%}

{%- unless page.title == nil or page.nav_exclude == true -%}

{%- assign activation_pages = site[page.collection]
      | default: site.html_pages
      | where_exp: "item", "item.title != nil"
      | where_exp: "item", "item.nav_exclude != true" -%}

{%- assign activation_first_level_index = nil -%}
{%- assign activation_second_level_index = nil -%}
{%- assign activation_third_level_index = nil -%}
{%- assign activation_first_level_reversed = nil -%}
{%- assign activation_second_level_reversed = nil -%}

{%- assign activation_title = page.grand_parent | default: page.parent | default: page.title -%}
{%- assign activation_first_level = activation_pages
      | where_exp: "item", "item.parent == nil" -%}
{%- include sorted_pages.html pages = activation_first_level -%}
{%- for activation_page in sorted_pages -%}
  {%- if activation_page.title == activation_title -%}
    {%- assign activation_first_level_index = forloop.index -%}
    {%- assign activation_first_level_reversed = activation_page.child_nav_order -%}
    {%- break -%}
  {%- endif -%}
{%- endfor -%}

{%- unless activation_first_level_index == nil -%}

{%- if page.grand_parent -%}
  {%- assign activation_title = page.parent -%}
  {%- assign activation_second_level = activation_pages
        | where_exp: "item", "item.grand_parent == nil"
        | where_exp: "item", "item.parent == page.grand_parent" -%}
{%- elsif page.parent -%}
  {%- assign activation_title = page.title -%}
  {%- assign activation_second_level = activation_pages
        | where_exp: "item", "item.grand_parent == nil"
        | where_exp: "item", "item.parent == page.parent" -%}
{%- endif -%}
{%- if page.parent -%}
  {%- include sorted_pages.html pages = activation_second_level -%}
  {%- for activation_page in sorted_pages -%}
    {%- if activation_page.title == activation_title -%}
      {%- assign activation_second_level_index = forloop.index -%}
      {%- assign activation_second_level_reversed = activation_page.child_nav_order -%}
      {%- if activation_first_level_reversed -%}
        {%- assign activation_second_level_index = sorted_pages | size | plus: 1 | minus: activation_second_level_index -%}
      {%- endif -%}
      {%- break -%}
    {%- endif -%}
  {%- endfor -%}
{%- endif -%}

{%- if page.grand_parent -%}
  {%- assign activation_third_level = activation_pages
        | where_exp: "item", "item.parent == page.parent"
        | where_exp: "item", "item.grand_parent == page.grand_parent" -%}
  {%- include sorted_pages.html pages = activation_third_level -%}
  {%- assign activation_third_level = sorted_pages -%}
  {%- for activation_page in sorted_pages -%}
    {%- if activation_page.title == page.title -%}
      {%- assign activation_third_level_index = forloop.index -%}
      {%- if activation_second_level_reversed -%}
        {%- assign activation_third_level_index = sorted_pages | size | plus: 1 | minus: activation_third_level_index -%}
      {%- endif -%}
      {%- break -%}
    {%- endif -%}
  {%- endfor -%}
{%- endif -%}

{%- unless activation_second_level_index == nil and activation_third_level_index -%}

{%- if page.collection == nil -%}

  {%- capture activation_collection_prefix -%}
  .site-nav > .nav-list:nth-child(1):not(.nav-category-list) 
  {%- endcapture -%}

{%- else -%}

  {%- for activation_collection in site.just_the_docs.collections -%}
    {%- if activation_collection[0] == page.collection -%}
      {%- assign activation_collection_index = forloop.index -%}
      {%- break -%}
    {%- endif -%}
  {%- endfor -%}
  {%- assign activation_index = activation_collection_index -%}
  {%- assign activation_pages_top_size = site.html_pages
          | where_exp:"item", "item.title != nil"
          | where_exp:"item", "item.parent == nil"
          | where_exp:"item", "item.nav_exclude != true"
          | size -%}
  {%- if activation_pages_top_size > 0  -%}
    {%- assign activation_index = activation_index | plus: 1 -%}
  {%- endif -%}
  {%- if site.nav_external_links -%}
    {%- assign activation_index = activation_index | plus: 1 -%}
  {%- endif -%}
  {%- capture activation_collection_prefix -%}
  .site-nav > .nav-list:nth-of-type({{ activation_index }}){% if site.just_the_docs.collections[page.collection].nav_fold == true %} > .nav-list-item > .nav-list{% endif %}
  {%- endcapture -%}
  
{%- endif -%}

// Styling for the nav-list-link to the current page:
{{ activation_collection_prefix }} {
  > .nav-list-item:not(.external):nth-child({{ activation_first_level_index }}){%- if activation_second_level_index %} > .nav-list > .nav-list-item:nth-child({{ activation_second_level_index }}){%- if activation_third_level_index %} > .nav-list > .nav-list-item:nth-child({{ activation_third_level_index }}){% endif %}{% endif %} {
    > .nav-list-link {
      display: block;
      font-weight: 600;
      text-decoration: none;
      background-image: linear-gradient(
        -90deg,
        rgba($feedback-color, 1) 0%,
        rgba($feedback-color, 0.8) 80%,
        rgba($feedback-color, 0) 100%
      );
    }
  }
}

// Styling for nav-list-expanders at first and second levels,
// suppressed when a click has deactivated the expander (making the nav-list-item .passive):
{{ activation_collection_prefix }} {
  > .nav-list-item:not(.passive):nth-child({{ activation_first_level_index }}){%- if activation_second_level_index %},
  > .nav-list-item:not(.passive):nth-child({{ activation_first_level_index }}) > .nav-list > .nav-list-item:not(.passive):nth-child({{ activation_second_level_index }}){% endif %} {
    > .nav-list-expander svg {
      @if $nav-list-expander-right {
        transform: rotate(-90deg);
      } @else {
        transform: rotate(90deg);
      }
    }

    > .nav-list {
      display: block;
    }
  }
}

// Styling for nav-list-expander for categories:
.site-nav > .nav-category-list > .nav-list-item:not(.passive) {
  > .nav-list-expander svg {
    @if $nav-list-expander-right {
      transform: rotate(-90deg);
    } @else {
      transform: rotate(90deg);
    }
  }

  > .nav-list {
    display: block;
  }
}

{%- endunless -%}
{%- endunless -%}
{%- endunless -%}