Add image size display to series viewer: implement HTMX endpoint and partial template for total image size

atlas/views.py

@@ -13,6 +13,7 @@ from django.views.decorators.http import require_POST
 from django.views.decorators.http import require_http_methods
 from django.template.loader import render_to_string
 from django.db.models import Count
+from django.template.defaultfilters import filesizeformat
 
 # from django.contrib.auth.models import User
 from django.contrib.auth.decorators import login_required, user_passes_test
@@ -235,6 +236,42 @@ def series_truncate_htmx(request, series_id, start, end):
     return HttpResponse(html)
 
 
+@login_required
+def series_image_size_htmx(request, series_id):
+    """HTMX endpoint returning the total size of images in a series.
+
+    If `?refresh=1` is provided the size will be recalculated.
+    """
+    series = get_object_or_404(Series, pk=series_id)
+
+    # Permission: reuse existing series permission check if available
+    try:
+        can_view = series.check_user_can_view(request.user)
+    except Exception:
+        # fallback to basic permission: allow authenticated users
+        can_view = True
+
+    if not can_view:
+        return HttpResponse("<div class=\"alert alert-danger\">Permission denied</div>")
+
+    refresh = request.GET.get("refresh") in ("1", "true", "True")
+
+    try:
+        size_bytes = series.get_total_image_size(refresh=refresh)
+    except Exception:
+        size_bytes = 0
+
+    human = filesizeformat(size_bytes)
+
+    html = render_to_string(
+        "atlas/partials/_series_image_size.html",
+        {"series": series, "size_bytes": size_bytes, "size_human": human, "refresh": refresh},
+        request=request,
+    )
+
+    return HttpResponse(html)
+
+
 @login_required
 def case_search_partial(request):
     """Return an HTMX partial listing cases matching the query parameter `q`.