feat(#36): add Mail notification on Low Battery

app/Jobs/NotifyDeviceBatteryLowJob.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\Device;
+use App\Models\User;
+use App\Notifications\BatteryLow;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+
+class NotifyDeviceBatteryLowJob implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    public function __construct() {}
+
+    public function handle(): void
+    {
+        $devices = Device::all();
+        $batteryThreshold = config('app.notifications.battery_low.warn_at_percent');
+
+        foreach ($devices as $device) {
+            $batteryPercent = $device->battery_percent;
+
+            // If battery is above threshold, reset the notification flag
+            if ($batteryPercent > $batteryThreshold && $device->battery_notification_sent) {
+                $device->battery_notification_sent = false;
+                $device->save();
+
+                continue;
+            }
+
+            // Skip if battery is not low or notification was already sent
+            if ($batteryPercent > $batteryThreshold || $device->battery_notification_sent) {
+                continue;
+            }
+
+            /** @var User|null $user */
+            $user = $device->user;
+
+            if (! $user) {
+                continue; // Skip if no user is associated with the device
+            }
+
+            // Send notification and mark as sent
+            $user->notify(new BatteryLow($device));
+            $device->battery_notification_sent = true;
+            $device->save();
+        }
+    }
+}