Phase 4: foreground service for background tasks

app/src/main/java/io/github/abrarul/modularai/service/AgentService.kt

@@ -0,0 +1,42 @@
+package io.github.abrarul.modularai.service
+
+import android.app.*
+import android.content.Context
+import android.content.Intent
+import android.content.pm.ServiceInfo
+import android.os.IBinder
+import android.os.PowerManager
+
+/** Keeps long jobs (downloads, inference, scripts) alive under a visible notification. */
+class AgentService : Service() {
+    private var wake: PowerManager.WakeLock? = null
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        if (intent?.action == ACTION_STOP) { stopSelf(); return START_NOT_STICKY }
+        val nm = getSystemService(NotificationManager::class.java)
+        nm.createNotificationChannel(NotificationChannel(CH, "Background tasks", NotificationManager.IMPORTANCE_LOW))
+        val stop = PendingIntent.getService(
+            this, 0, Intent(this, AgentService::class.java).setAction(ACTION_STOP),
+            PendingIntent.FLAG_IMMUTABLE
+        )
+        val n = Notification.Builder(this, CH)
+            .setContentTitle("ModularAI running")
+            .setContentText("Background task active")
+            .setSmallIcon(android.R.drawable.stat_sys_download)
+            .addAction(Notification.Action.Builder(null, "Stop", stop).build())
+            .build()
+        startForeground(1, n, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC)
+        wake = getSystemService(PowerManager::class.java)
+            .newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "modularai:agent").apply { acquire(30 * 60 * 1000L) }
+        return START_STICKY
+    }
+
+    override fun onDestroy() { wake?.takeIf { it.isHeld }?.release(); super.onDestroy() }
+    override fun onBind(i: Intent?): IBinder? = null
+
+    companion object {
+        private const val CH = "agent"
+        const val ACTION_STOP = "io.github.abrarul.modularai.STOP"
+        fun start(ctx: Context) = ctx.startForegroundService(Intent(ctx, AgentService::class.java))
+    }
+}