feat: monitor connected Wi-Fi signal per interface (#2367)

internal/site/src/lib/wifi.ts

@@ -0,0 +1,20 @@
+import type { SystemRecord, WiFi } from "@/types"
+
+// Current system info is independent of the selected historical chart window.
+// No fallback to history: missing data, disconnect and offline all hide the panel.
+export function connectedWiFi(system: Pick<SystemRecord, "status" | "info">): [string, WiFi][] {
+	return system.status === "up" ? Object.entries(system.info?.wifi ?? {}).sort(([a], [b]) => a.localeCompare(b)) : []
+}
+
+export function strongestWiFiSignal(system: Pick<SystemRecord, "status" | "info">): number | undefined {
+	const signals = connectedWiFi(system)
+		.map(([, wifi]) => wifi.r)
+		.filter((signal): signal is number => signal !== undefined && Number.isFinite(signal))
+	return signals.length ? Math.max(...signals) : undefined
+}
+
+export function wifiColor(id: string): string {
+	let hash = 0
+	for (const char of id) hash = (Math.imul(hash, 31) + char.charCodeAt(0)) | 0
+	return `hsl(${(hash >>> 0) % 360}, 65%, 52%)`
+}