feat: favorite action (#19623)

mobile/lib/presentation/widgets/action_buttons/favorite_action_button.widget.dart

@@ -1,16 +1,73 @@
 import 'package:flutter/material.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/constants/enums.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/extensions/translate_extensions.dart';
 import 'package:immich_mobile/presentation/widgets/action_buttons/base_action_button.widget.dart';
+import 'package:immich_mobile/providers/infrastructure/action.provider.dart';
+import 'package:immich_mobile/providers/timeline/multiselect.provider.dart';
+import 'package:immich_mobile/providers/user.provider.dart';
+import 'package:immich_mobile/widgets/common/immich_toast.dart';
 
 class FavoriteActionButton extends ConsumerWidget {
-  const FavoriteActionButton({super.key});
+  final ActionSource source;
+
+  const FavoriteActionButton({super.key, required this.source});
+
+  onAction(BuildContext context, WidgetRef ref) {
+    switch (source) {
+      case ActionSource.timeline:
+        timelineAction(context, ref);
+      case ActionSource.viewer:
+        viewerAction(ref);
+    }
+  }
+
+  void timelineAction(BuildContext context, WidgetRef ref) {
+    final user = ref.read(currentUserProvider);
+    if (user == null) {
+      return;
+    }
+
+    final ids = ref
+        .read(multiSelectProvider.select((value) => value.selectedAssets))
+        .whereType<RemoteAsset>()
+        .where((asset) => asset.ownerId == user.id)
+        .map((asset) => asset.id)
+        .toList();
+
+    if (ids.isEmpty) {
+      return;
+    }
+
+    ref.read(actionProvider.notifier).favorite(ids);
+    ref.read(multiSelectProvider.notifier).reset();
+
+    final toastMessage = 'favorite_action_prompt'.t(
+      context: context,
+      args: {'count': ids.length.toString()},
+    );
+
+    if (context.mounted) {
+      ImmichToast.show(
+        context: context,
+        msg: toastMessage,
+        gravity: ToastGravity.BOTTOM,
+      );
+    }
+  }
+
+  void viewerAction(WidgetRef _) {
+    UnimplementedError("Viewer action for favorite is not implemented yet.");
+  }
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     return BaseActionButton(
       iconData: Icons.favorite_border_rounded,
       label: "favorite".t(context: context),
+      onPressed: () => onAction(context, ref),
     );
   }
 }