feat(video_calls): ios call declining notification for other devices fix

lib/features/video_calls/services/video_call_callkit_coordinator.dart

@@ -79,6 +79,8 @@ class VideoCallCallKitCoordinator {
             _scheduleNativeVoipDiagnosticsDrain();
           case 'acceptedVoipCall':
             await _handleNativeAcceptedVoipCall(call.arguments);
+          case 'declinedVoipCall':
+            await _handleNativeDeclinedVoipCall(call.arguments);
           case 'tombstoneCallId':
             _handleNativeTombstoneCallId(call.arguments);
         }
@@ -390,7 +392,11 @@ class VideoCallCallKitCoordinator {
       );
       return;
     }
-    await _handleDecline(id, eventExtra: _callKitEventParams(event)?.extra);
+    await _handleDecline(
+      id,
+      eventExtra: _callKitEventParams(event)?.extra,
+      skipBackendNotify: Platform.isIOS && event is CallEventActionCallDecline,
+    );
   }
 
   Future<void> _handleEndedEvent(CallEvent event) async {
@@ -615,6 +621,39 @@ class VideoCallCallKitCoordinator {
     );
   }
 
+  /// Same payload accept uses. The plugin decline event is not what stops
+  /// ringing on the other devices.
+  Future<void> _handleNativeDeclinedVoipCall(Object? arguments) async {
+    if (!Platform.isIOS) return;
+
+    final data = _stringKeyedMap(arguments);
+    final extra = _stringKeyedMap(data['extra']);
+    if (callKitExtraMarksEndedPush(Map<String, dynamic>.from(extra))) return;
+
+    final callKitId = _parseString(data, const ['id', 'uuid']);
+    if (callKitId != null &&
+        (_suppressedEndCallKitIds.contains(callKitId) ||
+            VideoCallRemoteEndRegistry.contains(callKitId))) {
+      return;
+    }
+
+    final conversationUuid = _parseConversationUuid(
+      extra,
+      handle: _parseString(data, const ['handle']),
+    );
+    final callId = backendVideoCallId(
+      callId:
+          _parseCallId(extra) ??
+          (callKitId != null && callKitId.contains('-') ? callKitId : null),
+      conversationUuid: conversationUuid,
+    );
+    log(
+      'VideoCallCallKitCoordinator: native declinedVoipCall conversation=$conversationUuid callId=$callId',
+      name: 'VideoCallCallKit',
+    );
+    await _manager.declineIncomingCall(conversationUuid, callId: callId);
+  }
+
   Future<void> _handleAccept(String callKitId) async {
     if (_acceptNavigationCompletedIds.contains(callKitId)) return;
 
@@ -976,6 +1015,7 @@ class VideoCallCallKitCoordinator {
   Future<void> _handleDecline(
     String callKitId, {
     Map<String, dynamic>? eventExtra,
+    bool skipBackendNotify = false,
   }) async {
     if (_suppressedEndCallKitIds.contains(callKitId)) {
       log(
@@ -1015,6 +1055,13 @@ class VideoCallCallKitCoordinator {
       return;
     }
 
+    if (skipBackendNotify) {
+      // iOS decline is reported from AppDelegate with the CallKit payload,
+      // the same way accept is. This plugin event must not send /ended instead.
+      _forgetCallKitId(callKitId);
+      return;
+    }
+
     _suppressedEndCallKitIds.add(callKitId);
     try {
       await FlutterCallkitIncoming.endCall(callKitId);