feat(push_notifications): issue-660, fix: issue-908

lib/core/push/hms_client_error.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/services.dart';
+
+bool isHuaweiFamilyBrand({
+  required String brand,
+  required String manufacturer,
+}) {
+  final normalizedBrand = brand.toLowerCase();
+  final normalizedManufacturer = manufacturer.toLowerCase();
+  return normalizedBrand.contains('huawei') ||
+      normalizedBrand.contains('honor') ||
+      normalizedManufacturer.contains('huawei') ||
+      normalizedManufacturer.contains('honor');
+}
+
+/// HMS Core is missing or rejects this app.
+///
+/// Honor devices with Google services return `907135003: client api invalid`.
+/// That is a device capability, not an app crash: the caller should use FCM.
+bool isHmsClientUnavailable(Object error) {
+  if (error is! PlatformException) return false;
+  final message = '${error.message ?? ''} ${error.details ?? ''}'.toLowerCase();
+  return message.contains('907135003') ||
+      message.contains('client api invalid');
+}
+
+/// `huawei` only when an HMS token was actually issued. Otherwise Android uses FCM.
+String pushPlatform({
+  required bool isIos,
+  required bool huaweiFamily,
+  required bool hmsAvailable,
+  required bool hasHmsToken,
+}) {
+  if (isIos) return 'ios';
+  if (huaweiFamily && hmsAvailable && hasHmsToken) return 'huawei';
+  return 'android';
+}