{% extends "admin/base.html" %}
{% block title %}{{ 'Edit topic' if topic else 'New topic' }}{% endblock %}

{% macro val(field, default='') -%}
  {%- if form is not none -%}{{ form.get(field, default) }}
  {%- elif topic is not none -%}{{ topic[field] if topic[field] is not none else default }}
  {%- else -%}{{ default }}{%- endif -%}
{%- endmacro %}

{% block content %}
{% set current_section = (form.get('section_id') if form else (topic.section_id if topic else request.args.get('section'))) %}
{% set current_media = (form.get('media_type') if form else (topic.media_type if topic else 'none')) %}

<header class="page-head">
  <div>
    <h1>{{ 'Edit topic' if topic else 'New topic' }}</h1>
    <p class="muted">{{ topic.title if topic else 'Add a new topic to a section.' }}</p>
  </div>
  <a class="btn btn--ghost" href="{{ url_for('admin.dashboard') }}">← Back</a>
</header>

<form method="post" class="form-card stack"
      action="{{ url_for('admin.topic_form', topic_id=topic.id) if topic else url_for('admin.topic_form') }}">
  <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">

  <div class="grid-2">
    <label class="field">
      <span>Section *</span>
      <select name="section_id" required>
        {% for s in sections %}
        <option value="{{ s.id }}" {{ 'selected' if current_section and s.id|string == current_section|string }}>
          §{{ '%02d' % s.num }} — {{ s.title }}
        </option>
        {% endfor %}
      </select>
    </label>
    <label class="field">
      <span>Sort order</span>
      <input type="number" name="sort_order" value="{{ val('sort_order', '10') }}">
    </label>
  </div>

  <label class="field">
    <span>Title *</span>
    <input type="text" name="title" value="{{ val('title') }}" required>
  </label>

  <label class="field">
    <span>Slug <small class="muted">(optional — auto-generated from the title, must be unique)</small></span>
    <input type="text" name="slug" value="{{ val('slug') }}" placeholder="auto">
  </label>

  <label class="field">
    <span>Body <small class="muted">(HTML — use &lt;p&gt;, &lt;strong&gt;, &lt;ul&gt;&lt;li&gt;)</small></span>
    <textarea name="body_html" rows="7">{{ val('body_html') }}</textarea>
  </label>

  <fieldset class="fieldset">
    <legend>Media</legend>
    <div class="grid-2">
      <label class="field">
        <span>Type</span>
        <select name="media_type">
          {% for mt in media_types %}
          <option value="{{ mt }}" {{ 'selected' if mt == current_media }}>{{ mt }}</option>
          {% endfor %}
        </select>
      </label>
      <label class="field">
        <span>Caption</span>
        <input type="text" name="media_caption" value="{{ val('media_caption') }}">
      </label>
    </div>
    <label class="field">
      <span>Media URL</span>
      <input type="text" name="media_url" value="{{ val('media_url') }}"
             placeholder="/static/img/photo.jpg  ·  /static/vid/demo.mp4  ·  https://www.youtube.com/embed/ID">
    </label>
    <p class="hint muted">image → &lt;img&gt; · video → &lt;video&gt; · embed → &lt;iframe&gt; (use a YouTube <code>/embed/</code> URL)</p>
  </fieldset>

  <fieldset class="fieldset">
    <legend>Link button (optional)</legend>
    <div class="grid-2">
      <label class="field">
        <span>Link URL</span>
        <input type="text" name="link_url" value="{{ val('link_url') }}" placeholder="https://…">
      </label>
      <label class="field">
        <span>Link label</span>
        <input type="text" name="link_label" value="{{ val('link_label') }}" placeholder="Learn more">
      </label>
    </div>
  </fieldset>

  <div class="form-actions">
    <a class="btn btn--ghost" href="{{ url_for('admin.dashboard') }}">Cancel</a>
    <button class="btn btn--primary" type="submit">Save topic</button>
  </div>
</form>
{% endblock %}