{%comment%}<!--
  Copyright (c) 2016-2021 Martin Donath <martin.donath@squidfunk.com>

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to
  deal in the Software without restriction, including without limitation the
  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  sell copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  IN THE SOFTWARE.
-->{%endcomment%}

{% for nav_item in include.content %}

{% capture path %}{{include.base_path}}_{% increment path_counter %}{% endcapture %}

<!-- Determine class according to state -->
{% capture class %}md-nav__item{% if nav_item.active %} md-nav__item--active %}{%endif%}{%if nav_item.children and level == 1%} md-nav__item--section{%endif%}{%endcapture%}

<!-- Main navigation item with nested items -->
{% if nav_item.children %}

<!-- Determine whether to render item as a section -->
{% if site.features contains "navigation.sections" %}
{% if site.features contains "navigation.tabs" %}
{% if level == 2 %}{% capture class %}{{class}} md-nav__item--section{% endcapture %}{% endif %}
{% else %}
{% if level == 1 %}{% capture class %}{{class}} md-nav__item--section{% endcapture %}{% endif %}
{% endif %}
{% endif %}

<!-- Render item with nested items -->
<li class="{{ class }} md-nav__item--nested">

    <!-- Active checkbox expands items contained within nested section -->
    {% if nav_item.active %}{% assign checked = "checked" %}{% endif %}
    {% if site.features contains "navigation.expand" and checked == nil %}  {%comment%}"navigation.expand" in features = false{%endcomment%}
        <input
                class="md-nav__toggle md-toggle"
                data-md-toggle="{{ path }}"
                data-md-state="indeterminate"
                type="checkbox"
                id="{{ path }}"
                checked
        />
    {% else %}
        <input
                class="md-nav__toggle md-toggle"
                data-md-toggle="{{ path }}"
                type="checkbox"
                id="{{ path }}"
                {{ checked }}
        >
    {% endif %}

    <!-- Expand active pages -->
    <label class="md-nav__link" for="{{ path }}">
        {{ nav_item.title }}
        <span class="md-nav__icon md-icon"></span>
    </label>
    <nav class="md-nav" aria-label="{{ nav_item.title }}" data-md-level="{{ include.level }}">
        <label class="md-nav__title" for="{{ path }}">
            <span class="md-nav__icon md-icon"></span>
            {{ nav_item.title }}
        </label>
        <ul class="md-nav__list" data-md-scrollfix>

            <!-- Render nested item list -->
            {% assign lvl = include.level | plus: 1 %}
            {% include nav-items.html content=nav_item.children base_path=path level=lvl %}
        </ul>
    </nav>
</li>
<!-- Currently active page -->
{% elsif nav_item.url == page.url %}
<li class="{{ class }}">
    <!-- Active checkbox expands items contained within nested section -->
    <input
            class="md-nav__toggle md-toggle"
            data-md-toggle="toc"
            type="checkbox"
            id="__toc"
    />
    <a
            href="{% if nav_item.external_url %}{{ nav_item.external_url }}{% else %}{{ site.baseurl }}/{{ nav_item.url }}{% endif %}"
            class="md-nav__link md-nav__link--active"
    >
        {{ nav_item.title }}
    </a>
</li>

<!-- Main navigation item -->
{% else %}
<li class="{{ class }}">
    <a href="{% if nav_item.external_url %}{{ nav_item.external_url }}{% else %}{{ site.baseurl }}/{{ nav_item.url }}{% endif %}"
       class="md-nav__link">
        {{ nav_item.title }}
    </a>
</li>
{% endif %}
{% endfor %}