{% extends "base.html" %}

{% block title %}
{% set subject = section.extra.subject | default(value="math") %}
{% set subject_catalog = load_data(path="data/" ~ subject ~ "-curriculum.json", format="json") %}
{{ section.title }} | {{ subject_catalog.title }} | {{ config.extra.site_title }}
{% endblock title %}

{% block meta_description %}
<meta name="description" content="{{ section.description | default(value=config.description) }}" />
{% endblock meta_description %}

{% block extra_head %}
{% set subject = section.extra.subject %}
{% set slug = section.extra.chapter_id | default(value=section.slug) %}
{% set chapter_key = subject ~ "/" ~ slug %}
{% set chapters_meta = load_data(path="data/_generated/chapters-meta.json", format="json") %}
{% set subjects_meta = load_data(path="data/_generated/subjects-meta.json", format="json") %}
{% set chapter_meta = chapters_meta.chapters | get(key=chapter_key, default=false) %}
{% set subject_meta = subjects_meta.subjects[subject] | default(value=false) %}
{% if subject_meta and subject_meta.hasCss %}
<link rel="stylesheet" href="{{ get_url(path='css/subjects/' ~ subject ~ '.css', trailing_slash=false) | safe }}" />
{% endif %}
{% if chapter_meta and chapter_meta.hasCss %}
<link rel="stylesheet" href="{{ get_url(path='css/chapters/' ~ subject ~ '-' ~ slug ~ '.css', trailing_slash=false) | safe }}" />
{% endif %}
{% endblock extra_head %}

{% block content %}
{% set subject = section.extra.subject | default(value="math") %}
{% set slug = section.extra.chapter_id | default(value=section.slug) %}
{% set chapter_key = subject ~ "/" ~ slug %}
{% set subject_catalog = load_data(path="data/" ~ subject ~ "-curriculum.json", format="json") %}
{% set chapter_lastmod_data = load_data(path="data/_generated/chapter-lastmod.json", format="json") %}
{% set chapter_lastmod = chapter_lastmod_data.byKey[chapter_key] | default(value=false) %}
{% set catalog_subject_url = get_url(path="/catalog/") ~ "?subject=" ~ subject %}
<section class="book-page book-page--chapter">
  <div class="container">
    <nav class="book-breadcrumb" aria-label="Breadcrumb">
      <a href="{{ get_url(path='/') | safe }}">Home</a>
      <span class="book-breadcrumb__sep" aria-hidden="true">/</span>
      <a href="{{ catalog_subject_url | safe }}">{{ subject_catalog.title }}</a>
      <span class="book-breadcrumb__sep" aria-hidden="true">/</span>
      <span aria-current="page">{{ section.title }}</span>
    </nav>

    <article
      class="book-chapter"
      data-pagefind-body
      data-chapter="{{ chapter_key }}"
    >
      <header class="book-chapter__header">
        <div class="book-chapter__header-main">
          {% if section.extra.strand %}
          <p class="section-kicker">{{ section.extra.strand }}</p>
          {% endif %}
          <h1 class="section-title">{{ section.title }}</h1>
          {% if section.description %}
          <p class="book-chapter__lead">{{ section.description }}</p>
          {% endif %}
        </div>
        <div id="copy-page-button" class="book-chapter__actions" data-pagefind-ignore></div>
      </header>

      <div id="chapter-heading-nav" data-pagefind-ignore></div>
      {{ section.content | safe }}
      {% if chapter_lastmod %}
      <p class="book-chapter__lastmod" data-pagefind-ignore>
        Last modified:
        <time
          datetime="{{ chapter_lastmod.iso }}"
          data-localize-lastmod
          data-utc-fallback="{{ chapter_lastmod.display }}"
        >{{ chapter_lastmod.display }}</time>
      </p>
      {% endif %}
      {% include "partials/chapter-footer-nav.html" %}
    </article>
  </div>
</section>
{% endblock content %}