cake_wallet/lib/view_model/send/output.dart

import 'package:cake_wallet/di.dart';
import 'package:cake_wallet/entities/calculate_fiat_amount_raw.dart';
import 'package:cake_wallet/entities/parse_address_from_domain.dart';
import 'package:cake_wallet/entities/parsed_address.dart';
import 'package:cake_wallet/src/screens/send/widgets/extract_address_from_parsed.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:mobx/mobx.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:cake_wallet/monero/monero.dart';
import 'package:cake_wallet/entities/calculate_fiat_amount.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:cake_wallet/store/dashboard/fiat_conversion_store.dart';
import 'package:cake_wallet/store/settings_store.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:cake_wallet/bitcoin/bitcoin.dart';

part 'output.g.dart';

const String cryptoNumberPattern = '0.0';

class Output = OutputBase with _$Output;

abstract class OutputBase with Store {
  OutputBase(this._wallet, this._settingsStore, this._fiatConversationStore)
      : _cryptoNumberFormat = NumberFormat(cryptoNumberPattern) {
    reset();
    _setCryptoNumMaximumFractionDigits();
    key = UniqueKey();
  }

  Key key;

  @observable
  String fiatAmount;

  @observable
  String cryptoAmount;

  @observable
  String address;

  @observable
  String note;

  @observable
  bool sendAll;

  @observable
  ParsedAddress parsedAddress;

  @observable
  String extractedAddress;

  @computed
  bool get isParsedAddress =>
      parsedAddress.parseFrom != ParseFrom.notParsed &&
      parsedAddress.name.isNotEmpty;

  @computed
  int get formattedCryptoAmount {
    int amount = 0;

    try {
      if (cryptoAmount?.isNotEmpty ?? false) {
        final _cryptoAmount = cryptoAmount.replaceAll(',', '.');
        int _amount = 0;
        switch (walletType) {
          case WalletType.monero:
            _amount = monero.formatterMoneroParseAmount(amount: _cryptoAmount);
            break;
          case WalletType.bitcoin:
            _amount =
                bitcoin.formatterStringDoubleToBitcoinAmount(_cryptoAmount);
            break;
          case WalletType.litecoin:
            _amount =
                bitcoin.formatterStringDoubleToBitcoinAmount(_cryptoAmount);
            break;
          default:
            break;
        }

        if (_amount > 0) {
          amount = _amount;
        }
      }
    } catch (e) {
      amount = 0;
    }

    return amount;
  }

  @computed
  double get estimatedFee {
    try {
      final fee = _wallet.calculateEstimatedFee(
          _settingsStore.priority[_wallet.type], formattedCryptoAmount);

      if (_wallet.type == WalletType.bitcoin ||
          _wallet.type == WalletType.litecoin) {
        return bitcoin.formatterBitcoinAmountToDouble(amount: fee);
      }

      if (_wallet.type == WalletType.monero) {
        return monero.formatterMoneroAmountToDouble(amount: fee);
      }
    } catch (e) {
      print(e.toString());
    }

    return 0;
  }

  @computed
  String get estimatedFeeFiatAmount {
    try {
      final fiat = calculateFiatAmountRaw(
          price: _fiatConversationStore.prices[_wallet.currency],
          cryptoAmount: estimatedFee);
      return fiat;
    } catch (_) {
      return '0.00';
    }
  }

  WalletType get walletType => _wallet.type;
  final WalletBase _wallet;
  final SettingsStore _settingsStore;
  final FiatConversionStore _fiatConversationStore;
  final NumberFormat _cryptoNumberFormat;

  @action
  void setSendAll() => sendAll = true;

  @action
  void reset() {
    sendAll = false;
    cryptoAmount = '';
    fiatAmount = '';
    address = '';
    note = '';
    resetParsedAddress();
  }

  void resetParsedAddress() {
    extractedAddress = '';
    parsedAddress = ParsedAddress(addresses: []);
  }

  @action
  void setCryptoAmount(String amount) {
    if (amount.toUpperCase() != S.current.all) {
      sendAll = false;
    }

    cryptoAmount = amount;
    _updateFiatAmount();
  }

  @action
  void setFiatAmount(String amount) {
    fiatAmount = amount;
    _updateCryptoAmount();
  }

  @action
  void _updateFiatAmount() {
    try {
      final fiat = calculateFiatAmount(
          price: _fiatConversationStore.prices[_wallet.currency],
          cryptoAmount: cryptoAmount.replaceAll(',', '.'));
      if (fiatAmount != fiat) {
        fiatAmount = fiat;
      }
    } catch (_) {
      fiatAmount = '';
    }
  }

  @action
  void _updateCryptoAmount() {
    try {
      final crypto = double.parse(fiatAmount.replaceAll(',', '.')) /
          _fiatConversationStore.prices[_wallet.currency];
      final cryptoAmountTmp = _cryptoNumberFormat.format(crypto);

      if (cryptoAmount != cryptoAmountTmp) {
        cryptoAmount = cryptoAmountTmp;
      }
    } catch (e) {
      cryptoAmount = '';
    }
  }

  void _setCryptoNumMaximumFractionDigits() {
    var maximumFractionDigits = 0;

    switch (_wallet.type) {
      case WalletType.monero:
        maximumFractionDigits = 12;
        break;
      case WalletType.bitcoin:
        maximumFractionDigits = 8;
        break;
      case WalletType.litecoin:
        maximumFractionDigits = 8;
        break;
      default:
        break;
    }

    _cryptoNumberFormat.maximumFractionDigits = maximumFractionDigits;
  }

  Future<void> fetchParsedAddress(BuildContext context) async {
    final domain = address;
    final ticker = _wallet.currency.title.toLowerCase();
    parsedAddress = await getIt.get<AddressResolver>().resolve(domain, ticker);
    extractedAddress = await extractAddressFromParsed(context, parsedAddress);
    note = parsedAddress.description;
  }
}