refactor(frontend): extract reusable hooks and page helper modules

vite-frontend/src/pages/node/system-info.ts

@@ -0,0 +1,86 @@
+export interface NodeSystemInfo {
+  cpuUsage: number;
+  memoryUsage: number;
+  uploadTraffic: number;
+  downloadTraffic: number;
+  uploadSpeed: number;
+  downloadSpeed: number;
+  uptime: number;
+}
+
+type RawSystemInfo = Record<string, string | number | undefined>;
+
+const toInteger = (value: string | number | undefined): number => {
+  return Number.parseInt(String(value ?? 0), 10) || 0;
+};
+
+const toFloat = (value: string | number | undefined): number => {
+  return Number.parseFloat(String(value ?? 0)) || 0;
+};
+
+const parseRawSystemInfo = (messageData: unknown): RawSystemInfo | null => {
+  if (typeof messageData === "string") {
+    try {
+      const parsed = JSON.parse(messageData);
+
+      if (parsed && typeof parsed === "object") {
+        return parsed as RawSystemInfo;
+      }
+
+      return null;
+    } catch {
+      return null;
+    }
+  }
+
+  if (messageData && typeof messageData === "object") {
+    return messageData as RawSystemInfo;
+  }
+
+  return null;
+};
+
+export const buildNodeSystemInfo = (
+  messageData: unknown,
+  previous: NodeSystemInfo | null | undefined,
+): NodeSystemInfo | null => {
+  const raw = parseRawSystemInfo(messageData);
+
+  if (!raw) {
+    return null;
+  }
+
+  const uploadTraffic = toInteger(raw.bytes_transmitted);
+  const downloadTraffic = toInteger(raw.bytes_received);
+  const uptime = toInteger(raw.uptime);
+
+  let uploadSpeed = 0;
+  let downloadSpeed = 0;
+
+  if (previous && previous.uptime) {
+    const timeDiff = uptime - previous.uptime;
+
+    if (timeDiff > 0 && timeDiff <= 10) {
+      const uploadDiff = uploadTraffic - previous.uploadTraffic;
+      const downloadDiff = downloadTraffic - previous.downloadTraffic;
+
+      if (uploadTraffic >= previous.uploadTraffic && uploadDiff >= 0) {
+        uploadSpeed = uploadDiff / timeDiff;
+      }
+
+      if (downloadTraffic >= previous.downloadTraffic && downloadDiff >= 0) {
+        downloadSpeed = downloadDiff / timeDiff;
+      }
+    }
+  }
+
+  return {
+    cpuUsage: toFloat(raw.cpu_usage),
+    memoryUsage: toFloat(raw.memory_usage),
+    uploadTraffic,
+    downloadTraffic,
+    uploadSpeed,
+    downloadSpeed,
+    uptime,
+  };
+};