feat(status): add battery health scoring and uptime warning

- Battery card now shows health label (Healthy/Fair/Service Soon) based
  on cycle count and capacity thresholds, with color-coded cycles
- Uptime in header is color-coded: green ≤7d, yellow 7-14d, red >14d
  with restart indicator
- Both metrics now factor into the overall health score
- Added tests for batteryHealthLabel, uptimeSeverity, and health score
  battery/uptime penalties

Author: sebastianbreguel

cmd/status/metrics.go

@@ -61,6 +61,7 @@ type MetricsSnapshot struct {
 	Host           string       `json:"host"`
 	Platform       string       `json:"platform"`
 	Uptime         string       `json:"uptime"`
+	UptimeSeconds  uint64       `json:"uptime_seconds"`
 	Procs          uint64       `json:"procs"`
 	Hardware       HardwareInfo `json:"hardware"`
 	HealthScore    int          `json:"health_score"`     // 0-100 system health score
@@ -328,7 +329,7 @@ func (c *Collector) Collect() (MetricsSnapshot, error) {
 	}
 	hwInfo := c.cachedHW
 
-	score, scoreMsg := calculateHealthScore(cpuStats, memStats, diskStats, diskIO, thermalStats)
+	score, scoreMsg := calculateHealthScore(cpuStats, memStats, diskStats, diskIO, thermalStats, batteryStats, hostInfo.Uptime)
 	topProcs := topProcesses(allProcs, 5)
 
 	var processAlerts []ProcessAlert
@@ -343,6 +344,7 @@ func (c *Collector) Collect() (MetricsSnapshot, error) {
 		Host:           hostInfo.Hostname,
 		Platform:       fmt.Sprintf("%s %s", hostInfo.Platform, hostInfo.PlatformVersion),
 		Uptime:         formatUptime(hostInfo.Uptime),
+		UptimeSeconds:  hostInfo.Uptime,
 		Procs:          hostInfo.Procs,
 		Hardware:       hwInfo,
 		HealthScore:    score,

cmd/status/metrics_health.go

@@ -35,9 +35,21 @@ const (
 	// Disk IO (MB/s).
 	ioNormalThreshold = 50.0
 	ioHighThreshold   = 150.0
+
+	// Battery.
+	batteryCycleWarn   = 500
+	batteryCycleDanger = 900
+	batteryCapWarn     = 90
+	batteryCapDanger   = 80
+
+	// Uptime (seconds).
+	uptimeWarnDays   = 7
+	uptimeDangerDays = 14
+	uptimeWarnSecs   = uptimeWarnDays * 86400
+	uptimeDangerSecs = uptimeDangerDays * 86400
 )
 
-func calculateHealthScore(cpu CPUStatus, mem MemoryStatus, disks []DiskStatus, diskIO DiskIOStatus, thermal ThermalStatus) (int, string) {
+func calculateHealthScore(cpu CPUStatus, mem MemoryStatus, disks []DiskStatus, diskIO DiskIOStatus, thermal ThermalStatus, batteries []BatteryStatus, uptimeSecs uint64) (int, string) {
 	score := 100.0
 	issues := []string{}
 
@@ -123,6 +135,33 @@ func calculateHealthScore(cpu CPUStatus, mem MemoryStatus, disks []DiskStatus, d
 	}
 	score -= ioPenalty
 
+	// Battery health penalty (only when battery present).
+	if len(batteries) > 0 {
+		b := batteries[0]
+		if b.CycleCount > batteryCycleDanger {
+			score -= 5
+			issues = append(issues, "Battery Aging")
+		} else if b.CycleCount > batteryCycleWarn {
+			score -= 2
+		}
+		if b.Capacity > 0 && b.Capacity < batteryCapDanger {
+			score -= 5
+			if b.CycleCount <= batteryCycleDanger {
+				issues = append(issues, "Battery Degraded")
+			}
+		} else if b.Capacity > 0 && b.Capacity < batteryCapWarn {
+			score -= 2
+		}
+	}
+
+	// Uptime penalty (long uptime without restart).
+	if uptimeSecs > uptimeDangerSecs {
+		score -= 3
+		issues = append(issues, "Restart Recommended")
+	} else if uptimeSecs > uptimeWarnSecs {
+		score -= 1
+	}
+
 	// Clamp score.
 	if score < 0 {
 		score = 0
@@ -153,6 +192,29 @@ func calculateHealthScore(cpu CPUStatus, mem MemoryStatus, disks []DiskStatus, d
 	return int(score), msg
 }
 
+// batteryHealthLabel returns a human-readable health label and severity based on cycle count and capacity.
+// Severity is "ok", "warn", or "danger".
+func batteryHealthLabel(cycles int, capacity int) (string, string) {
+	if cycles > batteryCycleDanger || (capacity > 0 && capacity < batteryCapDanger) {
+		return "Service Soon", "danger"
+	}
+	if cycles > batteryCycleWarn || (capacity > 0 && capacity < batteryCapWarn) {
+		return "Fair", "warn"
+	}
+	return "Healthy", "ok"
+}
+
+// uptimeSeverity returns "ok", "warn", or "danger" based on uptime seconds.
+func uptimeSeverity(secs uint64) string {
+	if secs > uptimeDangerSecs {
+		return "danger"
+	}
+	if secs > uptimeWarnSecs {
+		return "warn"
+	}
+	return "ok"
+}
+
 func formatUptime(secs uint64) string {
 	days := secs / 86400
 	hours := (secs % 86400) / 3600

cmd/status/metrics_health_test.go

@@ -12,6 +12,7 @@ func TestCalculateHealthScorePerfect(t *testing.T) {
 		[]DiskStatus{{UsedPercent: 30}},
 		DiskIOStatus{ReadRate: 5, WriteRate: 5},
 		ThermalStatus{CPUTemp: 40},
+		nil, 0,
 	)
 
 	if score != 100 {
@@ -29,6 +30,7 @@ func TestCalculateHealthScoreDetectsIssues(t *testing.T) {
 		[]DiskStatus{{UsedPercent: 95}},
 		DiskIOStatus{ReadRate: 120, WriteRate: 80},
 		ThermalStatus{CPUTemp: 90},
+		nil, 0,
 	)
 
 	if score >= 40 {
@@ -160,14 +162,85 @@ func TestCalculateHealthScoreEdgeCases(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			score, _ := calculateHealthScore(tt.cpu, tt.mem, tt.disks, tt.diskIO, tt.thermal)
+			score, _ := calculateHealthScore(tt.cpu, tt.mem, tt.disks, tt.diskIO, tt.thermal, nil, 0)
 			if score < tt.wantMin || score > tt.wantMax {
 				t.Errorf("calculateHealthScore() = %d, want range [%d, %d]", score, tt.wantMin, tt.wantMax)
 			}
 		})
 	}
 }
 
+func TestBatteryHealthLabel(t *testing.T) {
+	tests := []struct {
+		name     string
+		cycles   int
+		capacity int
+		label    string
+		severity string
+	}{
+		{"new battery", 100, 98, "Healthy", "ok"},
+		{"moderate cycles", 600, 92, "Fair", "warn"},
+		{"high cycles", 950, 85, "Service Soon", "danger"},
+		{"low capacity", 200, 75, "Service Soon", "danger"},
+		{"warn capacity", 200, 88, "Fair", "warn"},
+		{"zero values", 0, 0, "Healthy", "ok"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			label, severity := batteryHealthLabel(tt.cycles, tt.capacity)
+			if label != tt.label {
+				t.Errorf("batteryHealthLabel(%d, %d) label = %q, want %q", tt.cycles, tt.capacity, label, tt.label)
+			}
+			if severity != tt.severity {
+				t.Errorf("batteryHealthLabel(%d, %d) severity = %q, want %q", tt.cycles, tt.capacity, severity, tt.severity)
+			}
+		})
+	}
+}
+
+func TestUptimeSeverity(t *testing.T) {
+	tests := []struct {
+		name string
+		secs uint64
+		want string
+	}{
+		{"fresh restart", 3600, "ok"},
+		{"6 days", 6 * 86400, "ok"},
+		{"8 days", 8 * 86400, "warn"},
+		{"15 days", 15 * 86400, "danger"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := uptimeSeverity(tt.secs)
+			if got != tt.want {
+				t.Errorf("uptimeSeverity(%d) = %q, want %q", tt.secs, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestHealthScoreBatteryPenalty(t *testing.T) {
+	base := func(batts []BatteryStatus, uptime uint64) int {
+		s, _ := calculateHealthScore(
+			CPUStatus{Usage: 10}, MemoryStatus{UsedPercent: 20},
+			[]DiskStatus{{UsedPercent: 30}}, DiskIOStatus{ReadRate: 5, WriteRate: 5},
+			ThermalStatus{CPUTemp: 40}, batts, uptime,
+		)
+		return s
+	}
+
+	perfect := base(nil, 0)
+	withOldBattery := base([]BatteryStatus{{CycleCount: 950, Capacity: 75}}, 0)
+	withLongUptime := base(nil, 15*86400)
+
+	if withOldBattery >= perfect {
+		t.Errorf("old battery should reduce score: got %d vs perfect %d", withOldBattery, perfect)
+	}
+	if withLongUptime >= perfect {
+		t.Errorf("long uptime should reduce score: got %d vs perfect %d", withLongUptime, perfect)
+	}
+}
+
 func TestFormatUptimeEdgeCases(t *testing.T) {
 	tests := []struct {
 		name string

cmd/status/view.go

@@ -177,7 +177,16 @@ func renderHeader(m MetricsSnapshot, errMsg string, animFrame int, termWidth int
 		optionalInfoParts = append(optionalInfoParts, m.Hardware.OSVersion)
 	}
 	if !compactHeader && m.Uptime != "" {
-		optionalInfoParts = append(optionalInfoParts, subtleStyle.Render("up "+m.Uptime))
+		uptimeText := "up " + m.Uptime
+		switch uptimeSeverity(m.UptimeSeconds) {
+		case "danger":
+			uptimeText = dangerStyle.Render(uptimeText + " ↻")
+		case "warn":
+			uptimeText = warnStyle.Render(uptimeText)
+		default:
+			uptimeText = subtleStyle.Render(uptimeText)
+		}
+		optionalInfoParts = append(optionalInfoParts, uptimeText)
 	}
 
 	headLeft := title + "  " + scoreText
@@ -641,15 +650,34 @@ func renderBatteryCard(batts []BatteryStatus, thermal ThermalStatus) cardData {
 		lines = append(lines, statusStyle.Render(statusText+statusIcon))
 
 		healthParts := []string{}
-		if b.Health != "" {
+
+		// Battery health assessment label.
+		if b.CycleCount > 0 || b.Capacity > 0 {
+			label, severity := batteryHealthLabel(b.CycleCount, b.Capacity)
+			switch severity {
+			case "danger":
+				healthParts = append(healthParts, dangerStyle.Render(label))
+			case "warn":
+				healthParts = append(healthParts, warnStyle.Render(label))
+			default:
+				healthParts = append(healthParts, okStyle.Render(label))
+			}
+		} else if b.Health != "" {
 			healthParts = append(healthParts, b.Health)
 		}
+
 		if b.CycleCount > 0 {
-			healthParts = append(healthParts, fmt.Sprintf("%d cycles", b.CycleCount))
+			cycleText := fmt.Sprintf("%d cycles", b.CycleCount)
+			if b.CycleCount > batteryCycleDanger {
+				cycleText = dangerStyle.Render(cycleText)
+			} else if b.CycleCount > batteryCycleWarn {
+				cycleText = warnStyle.Render(cycleText)
+			}
+			healthParts = append(healthParts, cycleText)
 		}
 
 		if thermal.CPUTemp > 0 {
-			tempText := colorizeTemp(thermal.CPUTemp) + "°C" // Reuse common color logic
+			tempText := colorizeTemp(thermal.CPUTemp) + "°C"
 			healthParts = append(healthParts, tempText)
 		}