ui: 30d repo-size sparkline on every dashboard host row

internal/server/http/ui_dashboard_sparkline_test.go

@@ -0,0 +1,83 @@
+package http
+
+import (
+	"context"
+	stdhttp "net/http"
+	"strings"
+	"testing"
+	"time"
+
+	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
+)
+
+func getDashboard(t *testing.T, baseURL string, cookie *stdhttp.Cookie) string {
+	t.Helper()
+	client := &stdhttp.Client{
+		CheckRedirect: func(_ *stdhttp.Request, _ []*stdhttp.Request) error {
+			return stdhttp.ErrUseLastResponse
+		},
+	}
+	req, err := stdhttp.NewRequest("GET", baseURL+"/", nil)
+	if err != nil {
+		t.Fatalf("new request: %v", err)
+	}
+	req.AddCookie(cookie)
+	res, err := client.Do(req)
+	if err != nil {
+		t.Fatalf("GET /: %v", err)
+	}
+	defer res.Body.Close()
+	if res.StatusCode != stdhttp.StatusOK {
+		t.Fatalf("GET /: want 200, got %d", res.StatusCode)
+	}
+	body := make([]byte, 0, 1<<20)
+	buf := make([]byte, 4096)
+	for {
+		n, rerr := res.Body.Read(buf)
+		body = append(body, buf[:n]...)
+		if rerr != nil {
+			break
+		}
+	}
+	return string(body)
+}
+
+func TestDashboard_HostRowSparklineRendersWithHistory(t *testing.T) {
+	t.Parallel()
+	_, baseURL, st := newTestServerWithUI(t)
+	cookie := loginAsAdmin(t, st)
+	hostID := makeHost(t, st, "h-spark")
+	ctx := context.Background()
+
+	// Two history points → polyline must render.
+	for i, day := range []string{"2026-05-05", "2026-05-06"} {
+		v := int64(100 + i*50)
+		if err := st.UpsertHostRepoStatsHistory(ctx, hostID, day,
+			store.HostRepoStats{TotalSizeBytes: &v}, time.Now().UTC()); err != nil {
+			t.Fatalf("upsert %s: %v", day, err)
+		}
+	}
+
+	body := getDashboard(t, baseURL, cookie)
+	if !strings.Contains(body, `class="repo-sparkline"`) {
+		t.Errorf("expected sparkline SVG in dashboard body (class=repo-sparkline missing)")
+	}
+	if !strings.Contains(body, `<polyline`) {
+		t.Errorf("expected <polyline> in dashboard body")
+	}
+}
+
+func TestDashboard_HostRowSparklineEmptyState(t *testing.T) {
+	t.Parallel()
+	_, baseURL, st := newTestServerWithUI(t)
+	cookie := loginAsAdmin(t, st)
+	makeHost(t, st, "h-empty")
+
+	body := getDashboard(t, baseURL, cookie)
+	if !strings.Contains(body, `class="repo-sparkline"`) {
+		t.Errorf("expected sparkline SVG element on dashboard")
+	}
+	if !strings.Contains(body, `>—<`) {
+		t.Errorf("expected em-dash placeholder in empty sparkline cell")
+	}
+}

internal/server/http/ui_handlers.go

@@ -5,8 +5,10 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"errors"
+	"html/template"
 	"io/fs"
 	"log/slog"
+	"math"
 	stdhttp "net/http"
 	"net/url"
 	"sort"
@@ -24,6 +26,7 @@ import (
 	"gitea.dcglab.co.uk/steve/restic-manager/internal/server/ws"
 	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
 	"gitea.dcglab.co.uk/steve/restic-manager/internal/version"
+	"gitea.dcglab.co.uk/steve/restic-manager/internal/web/sparkline"
 	"gitea.dcglab.co.uk/steve/restic-manager/web"
 )
 
@@ -196,6 +199,10 @@ type dashboardHostRow struct {
 	// TargetVersion is the server's build version, surfaced in the
 	// chip's tooltip and label.
 	TargetVersion string
+	// RepoSparklineSVG is a server-rendered inline SVG showing the
+	// 30-day repo-size trend. Empty-state SVG (em-dash) is returned
+	// when no history rows exist for the host.
+	RepoSparklineSVG template.HTML
 }
 
 // pickRunAllSchedule returns the ID of the single schedule whose
@@ -296,6 +303,20 @@ func (s *Server) handleUIDashboard(w stdhttp.ResponseWriter, r *stdhttp.Request)
 				}
 			}
 		}
+		since := time.Now().UTC().AddDate(0, 0, -30)
+		pts, herr := s.deps.Store.ListHostRepoStatsHistory(r.Context(), h.ID, since)
+		if herr != nil {
+			slog.Warn("ui dashboard: list repo history", "host_id", h.ID, "err", herr)
+		}
+		sparkPoints := make([]float64, len(pts))
+		for i, p := range pts {
+			if p.TotalSizeBytes == nil {
+				sparkPoints[i] = math.NaN()
+			} else {
+				sparkPoints[i] = float64(*p.TotalSizeBytes)
+			}
+		}
+		row.RepoSparklineSVG = sparkline.RenderSparkline(sparkPoints, 88, 20)
 		rows = append(rows, row)
 	}