fix battery usage

bar/services/battery.py

@@ -0,0 +1,72 @@
+import psutil
+from fabric.core.service import Service, Signal
+from fabric.utils import invoke_repeater
+
+
+class BatteryService(Service):
+    @Signal
+    def battery_changed(self, percent: float, charging: bool) -> None:
+        """Signal emitted when battery status changes"""
+        pass
+
+    def __init__(self, update_interval=10000, **kwargs):  # Check every 10 seconds
+        super().__init__(**kwargs)
+        self._percent = 0.0
+        self._charging = False
+        self._update_interval = update_interval
+        self._timer_id = None
+
+        # Start periodic updates
+        self.start_monitoring()
+
+    def start_monitoring(self):
+        """Start monitoring battery status"""
+        if self._timer_id is None:
+            # Get initial values
+            self._update_battery()
+            # Set up periodic updates
+            self._timer_id = invoke_repeater(self._update_interval, self._update_battery)
+
+    def stop_monitoring(self):
+        """Stop monitoring battery status"""
+        if self._timer_id is not None:
+            from gi.repository import GLib
+            GLib.source_remove(self._timer_id)
+            self._timer_id = None
+
+    def _update_battery(self):
+        """Update battery status and emit signal if changed"""
+        try:
+            # Use the same pattern as the example
+            bat_sen = psutil.sensors_battery()
+            if not bat_sen:
+                # No battery sensor available (desktop systems)
+                new_percent = 100.0  # Assume plugged in
+                new_charging = True
+            else:
+                new_percent = bat_sen.percent
+                new_charging = bat_sen.power_plugged
+
+            # Only emit signal if values changed
+            percent_changed = abs(new_percent - self._percent) > 0.5
+            charging_changed = new_charging != self._charging
+
+            if percent_changed or charging_changed:
+                self._percent = new_percent
+                self._charging = new_charging
+                self.battery_changed(new_percent, new_charging)
+
+        except Exception as e:
+            print(f"Error updating battery status: {e}")
+
+        return True  # Keep the timer running
+
+    @property
+    def percent(self):
+        """Get current battery percentage"""
+        return self._percent
+
+    @property
+    def charging(self):
+        """Get current charging status"""
+        return self._charging