{# FG-4: corpus-wide graph overview fragment — lazy-loaded into #graph-overview.

   Context:
     available    — False when the knowledge graph isn't built (no [graph] data
                    yet) OR when assembly raised; renders a notice, never counts.
     error        — True when _get_graph_overview() raised (generic notice, no
                    detail leaked — the cause stays in the server log only).
     paper_count  — Paper nodes in the graph.
     entity_count — Entity nodes in the graph.
     indexed/total— papers.graph_indexed=1 over all papers (FG-2 count idiom).
     by_type      — {entity_type: count}.
     by_predicate — {predicate: edge_count}.
     by_source    — {mention_source: count} (schema / biobert / llm_cloud).
     last_indexed — best-effort MAX(last_updated) over indexed papers, or None.

   All content is rendered through Jinja autoescape ONLY — never |safe, never
   striptags (scientific entity text legitimately contains < and >).
#}
{% if not available %}
<div class="card" id="graph-overview-notice">
  {% if error %}
  <p class="field-note">
    Could not load the knowledge graph overview &mdash; check the server logs.
  </p>
  {% else %}
  <p class="field-note">
    No knowledge graph yet &mdash; run a brain-build or
    <code>lit-monitor graph backfill --all</code> to populate the graph, then
    this overview will fill in.
  </p>
  {% endif %}
</div>
{% else %}
<div class="card" id="graph-overview-card">
  <h2>Graph health</h2>
  {% set _pct = ((indexed / total * 100) | round(0, "floor") | int) if total else 0 %}
  <p class="paper-meta">
    <span class="pill">{{ indexed }}/{{ total }} papers indexed ({{ _pct }}%)</span>
    <span class="pill">{{ paper_count }} paper nodes</span>
    <span class="pill">{{ entity_count }} entity nodes</span>
    {% if last_indexed %}
    <span class="pill muted">last indexed {{ last_indexed[:10] }}</span>
    {% endif %}
  </p>

  {# --- Entities by type --------------------------------------------------- #}
  <h3>Entities by type</h3>
  {% if by_type %}
  <table class="papers-table">
    <thead><tr><th>Type</th><th>Count</th></tr></thead>
    <tbody>
      {% for type_, count in by_type.items() %}
      <tr><td><span class="badge">{{ type_ }}</span></td><td>{{ count }}</td></tr>
      {% endfor %}
    </tbody>
  </table>
  {% else %}
  <p class="field-note">No entities in the graph yet.</p>
  {% endif %}

  {# --- Edges by predicate ------------------------------------------------- #}
  <h3>Edges by predicate</h3>
  {% if by_predicate %}
  <table class="papers-table">
    <thead><tr><th>Predicate</th><th>Count</th></tr></thead>
    <tbody>
      {% for pred, count in by_predicate.items() %}
      <tr><td>{{ pred }}</td><td>{{ count }}</td></tr>
      {% endfor %}
    </tbody>
  </table>
  {% else %}
  <p class="field-note">No edges in the graph yet.</p>
  {% endif %}

  {# --- Entities (mentions) by extraction source --------------------------- #}
  <h3>Mentions by source</h3>
  {% if by_source %}
  <table class="papers-table">
    <thead><tr><th>Source</th><th>Count</th></tr></thead>
    <tbody>
      {% for src, count in by_source.items() %}
      <tr><td>{{ src }}</td><td>{{ count }}</td></tr>
      {% endfor %}
    </tbody>
  </table>
  {% else %}
  <p class="field-note">No mention edges in the graph yet.</p>
  {% endif %}
</div>
{% endif %}