feat: Add user statuses and cards

electron/idle/idle-monitor.ts

@@ -0,0 +1,49 @@
+import { powerMonitor } from 'electron';
+import { getMainWindow } from '../window/create-window';
+
+const IDLE_THRESHOLD_SECONDS = 15 * 60; // 15 minutes
+const POLL_INTERVAL_MS = 10_000; // Check every 10 seconds
+
+let pollTimer: ReturnType<typeof setInterval> | null = null;
+let wasIdle = false;
+
+const IDLE_STATE_CHANGED_CHANNEL = 'idle-state-changed';
+
+export type IdleState = 'active' | 'idle';
+
+/**
+ * Starts polling `powerMonitor.getSystemIdleTime()` and notifies the
+ * renderer whenever the user transitions between active and idle.
+ */
+export function startIdleMonitor(): void {
+  if (pollTimer)
+    return;
+
+  pollTimer = setInterval(() => {
+    const idleSeconds = powerMonitor.getSystemIdleTime();
+    const isIdle = idleSeconds >= IDLE_THRESHOLD_SECONDS;
+
+    if (isIdle !== wasIdle) {
+      wasIdle = isIdle;
+      const state: IdleState = isIdle ? 'idle' : 'active';
+      const mainWindow = getMainWindow();
+
+      if (mainWindow && !mainWindow.isDestroyed()) {
+        mainWindow.webContents.send(IDLE_STATE_CHANGED_CHANNEL, state);
+      }
+    }
+  }, POLL_INTERVAL_MS);
+}
+
+export function stopIdleMonitor(): void {
+  if (pollTimer) {
+    clearInterval(pollTimer);
+    pollTimer = null;
+  }
+}
+
+export function getIdleState(): IdleState {
+  const idleSeconds = powerMonitor.getSystemIdleTime();
+
+  return idleSeconds >= IDLE_THRESHOLD_SECONDS ? 'idle' : 'active';
+}