Source Code added

mobile/lib/utils/thumbnail_utils.dart

@@ -0,0 +1,49 @@
+import 'package:easy_localization/easy_localization.dart';
+import 'package:immich_mobile/domain/models/exif.model.dart';
+import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:immich_mobile/extensions/translate_extensions.dart';
+
+String getAltText(ExifInfo? exifInfo, DateTime fileCreatedAt, AssetType type, List<String> peopleNames) {
+  if (exifInfo?.description != null && exifInfo!.description!.isNotEmpty) {
+    return exifInfo.description!;
+  }
+  final (template, args) = getAltTextTemplate(exifInfo, fileCreatedAt, type, peopleNames);
+  return template.t(args: args);
+}
+
+(String, Map<String, String>) getAltTextTemplate(
+  ExifInfo? exifInfo,
+  DateTime fileCreatedAt,
+  AssetType type,
+  List<String> peopleNames,
+) {
+  final isVideo = type == AssetType.video;
+  final hasLocation = exifInfo?.city != null && exifInfo?.country != null;
+  final date = DateFormat.yMMMMd().format(fileCreatedAt);
+  final args = {
+    "isVideo": isVideo.toString(),
+    "date": date,
+    "city": exifInfo?.city ?? "",
+    "country": exifInfo?.country ?? "",
+    "person1": peopleNames.elementAtOrNull(0) ?? "",
+    "person2": peopleNames.elementAtOrNull(1) ?? "",
+    "person3": peopleNames.elementAtOrNull(2) ?? "",
+    "additionalCount": (peopleNames.length - 3).toString(),
+  };
+  final template = hasLocation
+      ? (switch (peopleNames.length) {
+          0 => "image_alt_text_date_place",
+          1 => "image_alt_text_date_place_1_person",
+          2 => "image_alt_text_date_place_2_people",
+          3 => "image_alt_text_date_place_3_people",
+          _ => "image_alt_text_date_place_4_or_more_people",
+        })
+      : (switch (peopleNames.length) {
+          0 => "image_alt_text_date",
+          1 => "image_alt_text_date_1_person",
+          2 => "image_alt_text_date_2_people",
+          3 => "image_alt_text_date_3_people",
+          _ => "image_alt_text_date_4_or_more_people",
+        });
+  return (template, args);
+}