gistfile1.txt

FirebaseMessaging.instance.getInitialMessage().then((RemoteMessage message)  async{
      if (message != null) {
        if(message.data != null){
        if(message.data['not_type'] == 'user_chat_new_message'){
          print(message.data['not_type']);
          
          // intialise chat between this two users
          var startChat = await Provider.of<ChatProvider>(navigatorKey.currentState.context, listen: false).initChat(
            message.data['user_1_id'],
            message.data['user_2_id']
          );
          
          // valid data was returned from API
          if(startChat != null){
            // set this data to the current conversation
            Provider.of<ChatProvider>(navigatorKey.currentState.context, listen: false).setSelectedChatConverstion(startChat);
            
            // navigate to the main chat screen using the selected conversation
            // make sure that the sender and reciever Ids are not the same person
            Get.offAll(() => MainChatScreen(
              chatId: message.data['user_chat_id'],
              senderId: Provider.of<HomeProvider>(navigatorKey.currentState.context, listen: false).profile.id,
              receiverId: Provider.of<HomeProvider>(navigatorKey.currentState.context, listen: false).profile.id == message.data['user_1_id']
              ? message.data['user_2_id']
              : message.data['user_1_id']
            ));
          }
          
        }
      }
      }
    });