Pause sservice when battery is low

app/lib/event/event.dart

@@ -130,6 +130,9 @@ enum MetadataTaskState {
 
   /// Paused on data network
   waitingForWifi,
+
+  /// Paused on low battery
+  lowBattery,
 }
 
 class MetadataTaskStateChangedEvent {

app/lib/l10n/app_en.arb

@@ -1171,6 +1171,10 @@
 	"@backgroundServiceStopping": {
 		"description": "The background service is stopping itself"
 	},
+	"metadataTaskPauseLowBatteryNotification": "Battery is low",
+	"@metadataTaskPauseLowBatteryNotification": {
+		"description": "Shown when the app has paused reading image metadata due to low battery"
+	},
 
 	"errorUnauthenticated": "Unauthenticated access. Please sign-in again if the problem continues",
 	"@errorUnauthenticated": {

app/lib/l10n/untranslated-messages.txt

@@ -83,6 +83,7 @@
     "addTagInputHint",
     "tagPickerNoTagSelectedNotification",
     "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification",
     "errorAlbumDowngrade"
   ],
 
@@ -184,6 +185,7 @@
     "addTagInputHint",
     "tagPickerNoTagSelectedNotification",
     "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification",
     "errorAlbumDowngrade"
   ],
 
@@ -340,17 +342,20 @@
     "addTagInputHint",
     "tagPickerNoTagSelectedNotification",
     "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification",
     "errorAlbumDowngrade"
   ],
 
   "es": [
     "rootPickerSkipConfirmationDialogContent2",
     "helpButtonLabel",
-    "backgroundServiceStopping"
+    "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification"
   ],
 
   "fi": [
-    "backgroundServiceStopping"
+    "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification"
   ],
 
   "fr": [
@@ -486,6 +491,7 @@
     "addTagInputHint",
     "tagPickerNoTagSelectedNotification",
     "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification",
     "errorAlbumDowngrade"
   ],
 
@@ -509,7 +515,8 @@
     "createCollectionDialogTagDescription",
     "addTagInputHint",
     "tagPickerNoTagSelectedNotification",
-    "backgroundServiceStopping"
+    "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification"
   ],
 
   "ru": [
@@ -618,6 +625,7 @@
     "addTagInputHint",
     "tagPickerNoTagSelectedNotification",
     "backgroundServiceStopping",
+    "metadataTaskPauseLowBatteryNotification",
     "errorAlbumDowngrade"
   ]
 }

app/lib/service.dart

@@ -125,6 +125,13 @@ class _Service {
           )
           ..pauseWakeLock();
         _isPaused = true;
+      } else if (ev.state == MetadataTaskState.lowBattery) {
+        FlutterBackgroundService()
+          ..setNotificationInfo(
+            title: _L10n.global().metadataTaskPauseLowBatteryNotification,
+          )
+          ..pauseWakeLock();
+        _isPaused = true;
       }
     } else {
       if (ev.state == MetadataTaskState.prcoessing) {

app/lib/use_case/update_missing_metadata.dart

@@ -1,3 +1,4 @@
+import 'package:battery_plus/battery_plus.dart';
 import 'package:event_bus/event_bus.dart';
 import 'package:kiwi/kiwi.dart';
 import 'package:logging/logging.dart';
@@ -53,6 +54,7 @@ class UpdateMissingMetadata {
         // since we need to download multiple images in their original size,
         // we only do it with WiFi
         await ensureWifi();
+        await ensureBattery();
         KiwiContainer().resolve<EventBus>().fire(
             const MetadataTaskStateChangedEvent(MetadataTaskState.prcoessing));
         if (!shouldRun) {
@@ -116,6 +118,17 @@ class UpdateMissingMetadata {
     }
   }
 
+  Future<void> ensureBattery() async {
+    while (await Battery().batteryLevel <= 15) {
+      if (!shouldRun) {
+        throw const InterruptedException();
+      }
+      KiwiContainer().resolve<EventBus>().fire(
+          const MetadataTaskStateChangedEvent(MetadataTaskState.lowBattery));
+      await Future.delayed(const Duration(seconds: 5));
+    }
+  }
+
   final FileRepo fileRepo;
 
   bool shouldRun = true;

app/lib/widget/home_photos.dart

@@ -692,6 +692,21 @@ class _Web {
                         style: const TextStyle(fontSize: 12),
                       ),
                     ],
+                  )
+                else if (_metadataTaskState == MetadataTaskState.lowBattery)
+                  Row(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      const Icon(
+                        Icons.sync_problem,
+                        size: 16,
+                      ),
+                      const SizedBox(width: 4),
+                      Text(
+                        L10n.global().metadataTaskPauseLowBatteryNotification,
+                        style: const TextStyle(fontSize: 12),
+                      ),
+                    ],
                   ),
                 Expanded(
                   child: Container(),

app/pubspec.lock

@@ -36,6 +36,48 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.8.2"
+  battery_plus:
+    dependency: "direct main"
+    description:
+      name: battery_plus
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
+  battery_plus_linux:
+    dependency: transitive
+    description:
+      name: battery_plus_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.1"
+  battery_plus_macos:
+    dependency: transitive
+    description:
+      name: battery_plus_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  battery_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: battery_plus_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.1"
+  battery_plus_web:
+    dependency: transitive
+    description:
+      name: battery_plus_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  battery_plus_windows:
+    dependency: transitive
+    description:
+      name: battery_plus_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   bloc:
     dependency: "direct main"
     description:
@@ -126,7 +168,7 @@ packages:
       name: connectivity_plus_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.1"
+    version: "1.3.0"
   connectivity_plus_macos:
     dependency: transitive
     description:
@@ -140,7 +182,7 @@ packages:
       name: connectivity_plus_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.1"
+    version: "1.2.0"
   connectivity_plus_web:
     dependency: transitive
     description:
@@ -189,7 +231,7 @@ packages:
       name: dbus
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.6.8"
+    version: "0.7.3"
   device_info_plus:
     dependency: "direct main"
     description:
@@ -625,7 +667,7 @@ packages:
       name: nm
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.4"
+    version: "0.5.0"
   node_preamble:
     dependency: transitive
     description:

app/pubspec.yaml

@@ -29,6 +29,7 @@ dependencies:
 
   # android only
   android_intent_plus: ^3.0.1
+  battery_plus: ^2.1.3
   bloc: ^7.0.0
   cached_network_image: ^3.0.0
   collection: ^1.15.0