{# docker/disk.html — image/disk usage: reclaimable space, per-image sizes #}
{% extends "base.html" %}
{% from "_macros.html" import crumbs %}
{% block title %}Disk — Docker — Steward{% endblock %}
{% block breadcrumb %}{{ crumbs([("Docker", "/plugins/docker/"), ("Image & disk usage", "")]) }}{% endblock %}
{% block content %}

<h1 class="page-title" style="margin-bottom:0.4rem;">Image &amp; disk usage</h1>
<p style="font-size:0.82rem;color:var(--text-muted);margin-bottom:1.5rem;">
  What Docker is keeping on each host's disk, from <code>docker system df</code>.
  Admins can clean up per host below; each action runs an audited Ansible playbook on that host.
</p>

{% if host_groups %}
{% for g in host_groups %}
<div style="margin-bottom:2rem;">
  <div style="font-weight:500;font-size:0.95rem;margin-bottom:0.75rem;">{{ g.host_name }}
    {% if g.as_of %}<span class="field-hint" style="font-weight:normal;">· as of {{ g.as_of|ago }}</span>{% endif %}</div>

  {# ── Summary stats ────────────────────────────────────────────────────── #}
  <div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:0.75rem;margin-bottom:1rem;">
    <div class="card" style="margin-bottom:0;">
      <div class="section-title" style="margin-bottom:0.3rem;">Reclaimable</div>
      <span class="stat-val" style="color:{% if g.summary.images_reclaimable != '0 B' %}var(--orange){% else %}var(--green){% endif %};">{{ g.summary.images_reclaimable }}</span>
      <div style="font-size:0.74rem;color:var(--text-muted);">held by images no container uses</div>
    </div>
    <div class="card" style="margin-bottom:0;">
      <div class="section-title" style="margin-bottom:0.3rem;">Images</div>
      <span class="stat-val">{{ g.summary.images_size }}</span>
      <div style="font-size:0.74rem;color:var(--text-muted);">{{ g.summary.images_active }}/{{ g.summary.images_total }} in use</div>
    </div>
    <div class="card" style="margin-bottom:0;">
      <div class="section-title" style="margin-bottom:0.3rem;">Stopped</div>
      <span class="stat-val" style="{% if g.stopped %}color:var(--text-muted){% endif %};">{{ g.stopped }}</span>
      <div style="font-size:0.74rem;color:var(--text-muted);">containers not running</div>
    </div>
    <div class="card" style="margin-bottom:0;">
      <div class="section-title" style="margin-bottom:0.3rem;">Container files</div>
      <span class="stat-val">{{ g.summary.containers_size }}</span>
      <div style="font-size:0.74rem;color:var(--text-muted);">written by {{ g.summary.containers_count }} containers on top of their images</div>
    </div>
    <div class="card" style="margin-bottom:0;">
      <div class="section-title" style="margin-bottom:0.3rem;">Volumes</div>
      <span class="stat-val">{{ g.summary.volumes_size }}</span>
      <div style="font-size:0.74rem;color:var(--text-muted);">{{ g.summary.volumes_count }} volumes; never pruned here</div>
    </div>
    <div class="card" style="margin-bottom:0;">
      <div class="section-title" style="margin-bottom:0.3rem;">Build cache</div>
      <span class="stat-val">{{ g.summary.build_cache_size }}</span>
      <div style="font-size:0.74rem;color:var(--text-muted);">left by <code>docker build</code>; safe to clear</div>
    </div>
  </div>

  {# ── Cleanup actions (admin only; audited Ansible prune run) ───────────── #}
  {% if session.user_role == 'admin' %}
  <div style="margin-bottom:1rem;">
    {% if ansible_available and g.has_target %}
    <div style="display:flex;flex-wrap:wrap;gap:0.5rem;align-items:center;">
      <form method="post" action="/plugins/docker/disk/{{ g.host_id }}/prune" style="margin:0;"
            data-confirm="Remove all STOPPED containers on {{ g.host_name }}? This cannot be undone.">{{ csrf_field() }}
        <input type="hidden" name="target" value="containers">
        <button type="submit" class="btn btn-sm">Prune stopped containers</button>
      </form>
      <form method="post" action="/plugins/docker/disk/{{ g.host_id }}/prune" style="margin:0;"
            data-confirm="Remove ALL unused images on {{ g.host_name }} (docker image prune -a)? Any image not used by a container is deleted.">{{ csrf_field() }}
        <input type="hidden" name="target" value="images">
        <button type="submit" class="btn btn-sm">Prune unused images</button>
      </form>
      <form method="post" action="/plugins/docker/disk/{{ g.host_id }}/prune" style="margin:0;"
            data-confirm="Run a full system prune on {{ g.host_name }}? Removes stopped containers, unused networks, untagged images nothing uses, and the build cache.">{{ csrf_field() }}
        <input type="hidden" name="target" value="system">
        <button type="submit" class="btn btn-sm btn-danger">System prune…</button>
      </form>
    </div>
    <div style="font-size:0.72rem;color:var(--text-muted);margin-top:0.4rem;">
      Reclaimed space appears on the next agent sample.
    </div>
    {% elif not ansible_available %}
    <div style="font-size:0.74rem;color:var(--text-muted);">Cleanup needs the Ansible runner (currently unavailable).</div>
    {% else %}
    <div style="font-size:0.74rem;color:var(--text-muted);">
      Link an <a href="/hosts/{{ g.host_id }}">Ansible target</a> to this host to enable prune actions.
    </div>
    {% endif %}
  </div>
  {% endif %}

  {# ── Per-image table ──────────────────────────────────────────────────── #}
  <div class="field-hint" style="margin-bottom:0.4rem;">
    {% if g.images_capped %}The {{ g.images|length }} largest of {{ g.summary.images_total }} images, largest first.
    {% else %}Every image, largest first.{% endif %}
  </div>
  <div class="card-flush">
    <table class="table">
      <thead>
        <tr><th>Image</th><th>Size</th>
          <th title="Layers this image has in common with other images: stored once, so removing this image frees its size less this">Shared with other images</th>
          <th>Used by</th></tr>
      </thead>
      <tbody>
        {% for im in g.images %}
        <tr>
          <td style="font-size:0.84rem;font-family:ui-monospace,monospace;max-width:340px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;">
            {% if im.repo_tag %}{{ im.repo_tag }}{% else %}<span style="color:var(--text-muted);">untagged</span> {{ im.image_id }}{% endif %}
            {% if im.reclaimable %}<span title="No container uses this image" style="font-size:0.68rem;color:var(--orange);border:1px solid var(--orange);border-radius:3px;padding:0 0.3rem;margin-left:0.4rem;">reclaimable</span>{% endif %}
          </td>
          <td style="font-family:ui-monospace,monospace;font-size:0.86rem;">{{ im.size }}</td>
          <td style="font-family:ui-monospace,monospace;font-size:0.86rem;color:var(--text-muted);">{{ im.shared }}</td>
          <td style="font-size:0.86rem;color:{% if im.containers %}var(--text){% else %}var(--text-muted){% endif %};">{% if im.containers %}{{ im.containers }} container{{ "s" if im.containers != 1 }}{% else %}nothing{% endif %}</td>
        </tr>
        {% else %}
        <tr><td colspan="4" style="color:var(--text-muted);font-size:0.85rem;text-align:center;padding:1.5rem;">No images reported.</td></tr>
        {% endfor %}
      </tbody>
    </table>
  </div>
</div>
{% endfor %}
{% else %}
<div class="card" style="text-align:center;padding:3rem;">
  <div style="color:var(--text-muted);font-size:0.9rem;">
    No disk usage reported yet. The host agent reports image/disk usage from
    <code>docker system df</code> on hosts running Docker.
  </div>
</div>
{% endif %}
{% endblock %}