saveMessageInLocal static method

Future<void> saveMessageInLocal(Message message)

Implementation

static Future<void> saveMessageInLocal(Message message) async {
  final pref = await SharedPreferences.getInstance();
  var validateMessages = pref.getString('messages');
  List<Message> messagesToSave = [];
  //The list of messages are intialized if the messages are null (no messages),
  //a new array of messages is created and the message is added to it
  if (validateMessages == null) {
    messagesToSave.add(message);
  } else {
    //If the list is not null we create a new decoded list where stores all the messages
    //that were previously saved in the device
    List decodedList = jsonDecode(validateMessages);
    try {
      messagesToSave = decodedList.map((e) => Message.fromJson(e)).toList();
    } catch (ex) {
      messagesToSave = [];
    }
    //If the message has the same TimeStamp means that the same message is going to be added twice
    //we filter those messages to not allow any unncesary adding
    messagesToSave.firstWhere(
      (element) => element.messageDate == message.messageDate,
      orElse: () {
        messagesToSave.add(message);
        return message;
      },
    );
  }
  //Finally we encode the messages to save it
  var encodedMessages = messagesToSave.map((e) => e.toJson()).toList();
  pref.setString('messages', jsonEncode(encodedMessages));

  if (kDebugMode) {
    print("Size del arreglo ${encodedMessages.length}");
  }
}