{% if get_chapters(course.name) | length %}
<div class="course-home-outline">
  <div class="course-home-headings">
    {{ _("Course Content") }}
  </div>
  {% for chapter in get_chapters(course.name) %}
  <div class="">
    <div class="chapter-title" data-target="#{{ get_slugified_chapter_title(chapter.title) }}"
      data-toggle="collapse" aria-expanded="false">
      <img class="chapter-icon" src="/assets/school/icons/chevron-right.svg">
      <div>{{ chapter.title }}</div>
    </div>

    <div class="chapter-content collapse navbar-collapse" id="{{ get_slugified_chapter_title(chapter.title) }}">

      {% if chapter.description %}
      <div class="chapter-description muted-text">
        {{ chapter.description }}
      </div>
      {% endif %}

      {% set is_instructor = is_instructor(course.name) %}
      <div class="lessons">

        {% for lesson in get_lessons(course.name, chapter) %}

        <div class="lesson-info {% if membership.current_lesson == lesson.name %} active-lesson {% endif %}">

          {% if membership or lesson.include_in_preview %}
          <a class="lesson-links" href="{{ get_lesson_url(course.name, lesson.number) }}{{course.query_parameter}}"
            data-course="{{ course.name }}">
            {{ lesson.title }}

            {% if membership %}
            <img class="ml-1 lesson-progress-tick {{ get_progress(course.name, lesson.name) != 'Complete' and 'hide' }}"
              src="/assets/school/icons/check.svg">
            {% endif %}

          </a>

          {% elif is_instructor and not lesson.include_in_preview %}
          <a class="lesson-links"
          title="This lesson is not available for preview. As you are the Instructor of the course only you can see it."
          href="{{ get_lesson_url(course.name, lesson.number) }}{{course.query_parameter}}"
          data-course="{{ course.name }}">
          <img class="mr-3" src="/assets/school/icons/lock.svg">
          <div>{{ lesson.title }}</div>
          </a>

          {% else %}
          <div class="no-preview" title="This lesson is not available for preview" data-course="{{ course.name }}">
            <div class="lesson-links">
              <img class="mr-3" src="/assets/school/icons/lock.svg">
              <div>{{ lesson.title }}</div>
            </div>
          </div>
          {% endif %}

        </div>
        {% endfor %}

      </div>
    </div>
  </div>
  {% endfor %}
</div>
{% endif %}

<script>

frappe.ready(() => {

  expand_the_active_chapter();

  $(".chapter-title").unbind().click((e) => {
    rotate_chapter_icon(e);
  });

  $(".no-preview").click((e) => {
    show_no_preview_dialog(e);
  });

});

const expand_the_first_chapter = () => {
  var elements = $(".course-outline .collapse");
  elements.each((i, element) => {
    if (i < 1) {
      show_section(element);
      return false;
    }
  });
};

const expand_the_active_chapter = () => {

  /* Find anchor matching the URL for course details page */
  var selector = $(`a[href="${decodeURIComponent(window.location.pathname)}"]`).parent();
  if (!selector.length) {
    selector = $(`a[href^="${decodeURIComponent(window.location.pathname)}"]`).parent();
  }
  if (selector.length && $(".course-details-page").length) {
    $(".lesson-info").removeClass("active-lesson")
    selector.addClass("active-lesson");
    show_section(selector.parent().parent());
  }

  /* For course home page */
  else if ($(".active-lesson").length) {
    selector = $(".active-lesson")
    show_section(selector.parent().parent());
  }

  /* If no active chapter then exapand the first chapter */
  else {
    expand_the_first_chapter();
  }
};

const show_section = (element) => {
  $(element).addClass("show");
  $(element).siblings(".chapter-title").children(".chapter-icon").css("transform", "rotate(90deg)");
  $(element).siblings(".chapter-title").attr("aria-expanded", true);
};

const rotate_chapter_icon = (e) => {
  var icon = $(e.currentTarget).children(".chapter-icon");
  if (icon.css("transform") == "none") {
    icon.css("transform", "rotate(90deg)");
  } else {
    icon.css("transform", "none");
  }
};

const show_no_preview_dialog = (e) => {
  frappe.warn(__("Not available for preview"),
      __("This lesson is not available for preview. Please join the course to access it."),
      () => {
        window.location.href = `/courses/${ $(e.currentTarget).data("course") }`
      },
      __("Start Learning"), false);
};

</script>