hash-wallet/lib/view_model/buy/buy_amount_view_model.dart

import 'package:hash_wallet/di.dart';
import 'package:hash_wallet/store/settings_store.dart';
import 'package:mobx/mobx.dart';
import 'package:hash_wallet/entities/fiat_currency.dart';

part 'buy_amount_view_model.g.dart';

class BuyAmountViewModel = BuyAmountViewModelBase with _$BuyAmountViewModel;

abstract class BuyAmountViewModelBase with Store {
  BuyAmountViewModelBase()
      : amount = '',
        fiatCurrency = FiatCurrency.usd {
    int selectedIndex =
        FiatCurrency.currenciesAvailableToBuyWith.indexOf(getIt.get<SettingsStore>().fiatCurrency);

    if (selectedIndex != -1) {
      fiatCurrency = FiatCurrency.currenciesAvailableToBuyWith[selectedIndex];
    }
  }

  @observable
  String amount;

  @observable
  FiatCurrency fiatCurrency;

  @computed
  double get doubleAmount {
    double _amount;

    try {
      _amount = double.parse(amount.replaceAll(',', '.'));
    } catch (_) {
      _amount = 0.0;
    }

    return _amount;
  }
}