feat(battery): monitor de batería por ACTION_BATTERY_CHANGED

callbackFlow sobre el sticky broadcast (sin polling, CLAUDE.md §8). Alimenta el chip DA-08 del dashboard y es la base del módulo 3.
2026-07-03 22:41:43 -06:00
parent 28f2359dda
commit 33de656931
1 changed files with 43 additions and 0 deletions
@@ -0,0 +1,43 @@
+package mx.paputec.rachita.platform.battery
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.BatteryManager
+import javax.inject.Inject
+import javax.inject.Singleton
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.distinctUntilChanged
+import mx.paputec.rachita.domain.model.BatteryStatus
+
+/**
+ * Real battery level + charging state from ACTION_BATTERY_CHANGED (sticky
+ * broadcast — no polling, CLAUDE.md §8). Feeds the dashboard chip (DA-08) now
+ * and the low-battery/charging-lock flows of module 3 later.
+ */
+@Singleton
+class BatteryStatusMonitor @Inject constructor(
+    private val context: Context,
+) {
+    val status: Flow<BatteryStatus> = callbackFlow {
+        val receiver = object : BroadcastReceiver() {
+            override fun onReceive(context: Context, intent: Intent) {
+                trySend(intent.toBatteryStatus())
+            }
+        }
+        val sticky = context.registerReceiver(receiver, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
+        sticky?.let { trySend(it.toBatteryStatus()) }
+        awaitClose { context.unregisterReceiver(receiver) }
+    }.distinctUntilChanged()
+}
+
+private fun Intent.toBatteryStatus(): BatteryStatus {
+    val level = getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
+    val scale = getIntExtra(BatteryManager.EXTRA_SCALE, -1)
+    val percent = if (level >= 0 && scale > 0) (level * 100) / scale else 100
+    val plugged = getIntExtra(BatteryManager.EXTRA_PLUGGED, 0)
+    return BatteryStatus(percent = percent, isCharging = plugged != 0)
+}