{% extends "base.html" %}
{% block title %}FDI — {{ alias }}{% endblock %}
{% block content %}
<h2>Function Description — <code class="mono">{{ alias }}</code></h2>

<p>
  <a href="/openlcb/nodes/{{ alias }}">&larr; back to node</a>
  &middot;
  <a href="/openlcb">discovery</a>
</p>

{% if fetch_error %}
<div class="card" style="border-color:var(--err,#c33)">
  <strong style="color:var(--err,#c33)">FDI fetch failed:</strong>
  <span>{{ fetch_error }}</span>
  <p class="muted small" style="margin-top:0.5rem">
    Not every loco publishes FDI. If this node lists Traction in its
    PIP flags but no FDI, the manufacturer just didn't wire an FDI
    document into memory space 0xFA — the loco still works, just
    without labeled function names.
  </p>
</div>
{% else %}

{% if not fdi.flat %}
<p class="muted">Node published an empty FDI (no functions declared).</p>
{% endif %}

{% for segment in fdi.segments %}
<div class="card">
  {% if segment.name %}<h3>{{ segment.name }}</h3>{% endif %}
  {% if segment.description %}<p class="muted">{{ segment.description }}</p>{% endif %}
  {% for group in segment.groups %}
  <div class="cdi-group" style="border-left:3px solid var(--muted,#888);padding-left:1rem;margin:0.75rem 0">
    {% if group.name %}<strong>{{ group.name }}</strong>{% endif %}
    {% if group.description %}
      <div class="muted small">{{ group.description }}</div>
    {% endif %}
    <table class="cv-variables" style="width:100%;margin-top:0.4rem">
      <thead>
        <tr>
          <th style="width:4em">F#</th>
          <th>Name</th>
          <th style="width:8em">Kind</th>
          <th style="width:8em">Behaviour</th>
          <th>Range</th>
        </tr>
      </thead>
      <tbody>
        {% for fn in group.functions %}
        <tr>
          <td class="mono">F{{ fn.number }}</td>
          <td>{{ fn.name or '—' }}</td>
          <td>{{ fn.kind }}</td>
          <td>
            {% if fn.momentary %}<span class="badge">momentary</span>
            {% else %}latching{% endif %}
          </td>
          <td class="mono small">
            {% if fn.min is not none or fn.max is not none %}
              {{ fn.min if fn.min is not none else '' }}..{{ fn.max if fn.max is not none else '' }}
            {% else %}—{% endif %}
          </td>
        </tr>
        {% endfor %}
      </tbody>
    </table>
  </div>
  {% endfor %}
</div>
{% endfor %}
{% endif %}
{% endblock %}