cake_wallet/lib/view_model/send/send_item.dart

import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
import 'package:cake_wallet/bitcoin/electrum_wallet.dart';
import 'package:cake_wallet/entities/calculate_fiat_amount_raw.dart';
import 'package:cake_wallet/entities/openalias_record.dart';
import 'package:cake_wallet/monero/monero_amount_format.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:mobx/mobx.dart';
import 'package:cake_wallet/core/wallet_base.dart';
import 'package:cake_wallet/monero/monero_wallet.dart';
import 'package:cake_wallet/entities/calculate_fiat_amount.dart';
import 'package:cake_wallet/entities/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';

part 'send_item.g.dart';

const String cryptoNumberPattern = '0.0';

class SendItem = SendItemBase with _$SendItem;

abstract class SendItemBase with Store {
  SendItemBase(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;

  @computed
  double get estimatedFee {
    int amount;

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

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

      final fee = _wallet.calculateEstimatedFee(
          _settingsStore.priority[_wallet.type], amount);

      if (_wallet is ElectrumWallet) {
        return bitcoinAmountToDouble(amount: fee);
      }

      if (_wallet is MoneroWallet) {
        return moneroAmountToDouble(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 = '';
  }

  @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<OpenaliasRecord> getOpenaliasRecord() async {
    final formattedName = OpenaliasRecord.formatDomainName(address);
    final record = await OpenaliasRecord.fetchAddressAndName(formattedName);

    if (record == null || record.address.contains(formattedName)) {
      return null;
    }

    address = record.address;
    return record;
  }
}