feat(mobile): sqlite asset viewer (#19552)

* add full image provider and refactor thumb providers

* photo_view updates

* wip: asset-viewer

* fix controller dispose on page change

* wip: bottom sheet

* fix interactions

* more bottomsheet changes

* generate schema

* PR feedback

* refactor asset viewer

* never rotate and fix background on page change

* use photoview as the loading builder

* precache after delay

* claude: optimizing rebuild of image provider

* claude: optimizing image decoding and caching

* use proper cache for new full size image providers

* chore: load local HEIC fullsize for iOS

* make controller callbacks nullable

* remove imageprovider cache

* do not handle drag gestures when zoomed

* use loadOriginal setting for HEIC / larger images

* preload assets outside timer

* never use same controllers in photo-view gallery

* fix: cannot scroll down once swipe with bottom sheet

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/domain/services/asset.service.dart

@@ -0,0 +1,19 @@
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/domain/models/exif.model.dart';
+import 'package:immich_mobile/infrastructure/repositories/remote_asset.repository.dart';
+
+class AssetService {
+  final RemoteAssetRepository _remoteAssetRepository;
+
+  const AssetService({
+    required RemoteAssetRepository remoteAssetRepository,
+  }) : _remoteAssetRepository = remoteAssetRepository;
+
+  Future<ExifInfo?> getExif(BaseAsset asset) async {
+    if (asset is LocalAsset || asset is! RemoteAsset) {
+      return null;
+    }
+
+    return _remoteAssetRepository.getExif(asset.id);
+  }
+}

mobile/lib/domain/services/setting.service.dart

@@ -1,6 +1,11 @@
 import 'package:immich_mobile/domain/models/setting.model.dart';
 import 'package:immich_mobile/domain/services/store.service.dart';
 
+// Singleton instance of SettingsService, to use in places
+// where reactivity is not required
+// ignore: non_constant_identifier_names
+final AppSetting = SettingsService(storeService: StoreService.I);
+
 class SettingsService {
   final StoreService _storeService;
 

mobile/lib/domain/services/timeline.service.dart

@@ -57,14 +57,19 @@ class TimelineFactory {
 class TimelineService {
   final TimelineAssetSource _assetSource;
   final TimelineBucketSource _bucketSource;
+  int _totalAssets = 0;
+  int get totalAssets => _totalAssets;
 
   TimelineService({
     required TimelineAssetSource assetSource,
     required TimelineBucketSource bucketSource,
   })  : _assetSource = assetSource,
         _bucketSource = bucketSource {
-    _bucketSubscription =
-        _bucketSource().listen((_) => unawaited(reloadBucket()));
+    _bucketSubscription = _bucketSource().listen((buckets) {
+      _totalAssets =
+          buckets.fold<int>(0, (acc, bucket) => acc + bucket.assetCount);
+      unawaited(reloadBucket());
+    });
   }
 
   final AsyncMutex _mutex = AsyncMutex();
@@ -117,6 +122,7 @@ class TimelineService {
       index >= _bufferOffset && index + count <= _bufferOffset + _buffer.length;
 
   List<BaseAsset> getAssets(int index, int count) {
+    assert(index + count <= totalAssets);
     if (!hasRange(index, count)) {
       throw RangeError('TimelineService::getAssets Index out of range');
     }
@@ -124,6 +130,17 @@ class TimelineService {
     return _buffer.slice(start, start + count);
   }
 
+  // Pre-cache assets around the given index for asset viewer
+  Future<void> preCacheAssets(int index) =>
+      _mutex.run(() => _loadAssets(index, 5));
+
+  BaseAsset getAsset(int index) {
+    if (!hasRange(index, 1)) {
+      throw RangeError('TimelineService::getAsset Index out of range');
+    }
+    return _buffer.elementAt(index - _bufferOffset);
+  }
+
   Future<void> dispose() async {
     await _bucketSubscription?.cancel();
     _bucketSubscription = null;