mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-09-30 10:21:17 +00:00
519 lines
14 KiB
Dart
519 lines
14 KiB
Dart
import 'package:decimal/decimal.dart';
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import 'package:flutter/foundation.dart';
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import 'package:stackwallet/models/exchange/aggregate_currency.dart';
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import 'package:stackwallet/models/exchange/response_objects/estimate.dart';
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import 'package:stackwallet/services/exchange/change_now/change_now_exchange.dart';
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import 'package:stackwallet/services/exchange/exchange.dart';
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import 'package:stackwallet/services/exchange/majestic_bank/majestic_bank_exchange.dart';
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import 'package:stackwallet/utilities/enums/exchange_rate_type_enum.dart';
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import 'package:stackwallet/utilities/logger.dart';
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class ExchangeFormState extends ChangeNotifier {
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Exchange? _exchange;
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Exchange get exchange => _exchange ??= Exchange.defaultExchange;
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ExchangeRateType _exchangeRateType = ExchangeRateType.estimated;
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ExchangeRateType get exchangeRateType => _exchangeRateType;
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set exchangeRateType(ExchangeRateType exchangeRateType) {
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_exchangeRateType = exchangeRateType;
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//
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}
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Estimate? _estimate;
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Estimate? get estimate => _estimate;
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bool _reversed = false;
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bool get reversed => _reversed;
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set reversed(bool reversed) {
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_reversed = reversed;
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//
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}
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Decimal? _rate;
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Decimal? get rate => _rate;
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// set rate(Decimal? rate) {
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// _rate = rate;
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// //
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// }
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Decimal? _sendAmount;
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Decimal? get sendAmount => _sendAmount;
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// set sendAmount(Decimal? sendAmount) {
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// _sendAmount = sendAmount;
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// //
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// }
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Decimal? _receiveAmount;
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Decimal? get receiveAmount => _receiveAmount;
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set receiveAmount(Decimal? receiveAmount) {
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_receiveAmount = receiveAmount;
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//
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}
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AggregateCurrency? _sendCurrency;
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AggregateCurrency? get sendCurrency => _sendCurrency;
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// set sendCurrency(Currency? sendCurrency) {
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// _sendCurrency = sendCurrency;
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// //
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// }
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AggregateCurrency? _receiveCurrency;
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AggregateCurrency? get receiveCurrency => _receiveCurrency;
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// set receiveCurrency(Currency? receiveCurrency) {
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// _receiveCurrency = receiveCurrency;
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// //
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// }
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Decimal? _minSendAmount;
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Decimal? get minSendAmount => _minSendAmount;
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// set minSendAmount(Decimal? minSendAmount) {
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// _minSendAmount = minSendAmount;
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// //
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// }
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Decimal? _minReceiveAmount;
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Decimal? get minReceiveAmount => _minReceiveAmount;
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// set minReceiveAmount(Decimal? minReceiveAmount) {
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// _minReceiveAmount = minReceiveAmount;
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// //
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// }
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Decimal? _maxSendAmount;
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Decimal? get maxSendAmount => _maxSendAmount;
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// set maxSendAmount(Decimal? maxSendAmount) {
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// _maxSendAmount = maxSendAmount;
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// //
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// }
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Decimal? _maxReceiveAmount;
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Decimal? get maxReceiveAmount => _maxReceiveAmount;
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// set maxReceiveAmount(Decimal? maxReceiveAmount) {
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// _maxReceiveAmount = maxReceiveAmount;
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// //
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// }
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//============================================================================
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// computed properties
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//============================================================================
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String? get fromTicker => _sendCurrency?.ticker;
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String? get toTicker => _receiveCurrency?.ticker;
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String get fromAmountString => _sendAmount?.toStringAsFixed(8) ?? "";
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String get toAmountString => _receiveAmount?.toStringAsFixed(8) ?? "";
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bool get canExchange {
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return sendCurrency != null &&
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receiveCurrency != null &&
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sendAmount != null &&
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sendAmount! >= Decimal.zero &&
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receiveAmount != null &&
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rate != null &&
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rate! >= Decimal.zero &&
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sendCurrency!.forExchange(exchange.name) != null &&
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receiveCurrency!.forExchange(exchange.name) != null &&
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warning.isEmpty;
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}
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String get warning {
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if (reversed) {
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if (_receiveCurrency != null && _receiveAmount != null) {
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if (_minReceiveAmount != null &&
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_receiveAmount! < _minReceiveAmount! &&
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_receiveAmount! > Decimal.zero) {
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return "Min receive amount ${_minReceiveAmount!.toString()} ${_receiveCurrency!.ticker.toUpperCase()}";
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} else if (_maxReceiveAmount != null &&
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_receiveAmount! > _maxReceiveAmount!) {
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return "Max receive amount ${_maxReceiveAmount!.toString()} ${_receiveCurrency!.ticker.toUpperCase()}";
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}
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}
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} else {
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if (_sendCurrency != null && _sendAmount != null) {
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if (_minSendAmount != null &&
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_sendAmount! < _minSendAmount! &&
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_sendAmount! > Decimal.zero) {
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return "Min send amount ${_minSendAmount!.toString()} ${_sendCurrency!.ticker.toUpperCase()}";
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} else if (_maxSendAmount != null && _sendAmount! > _maxSendAmount!) {
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return "Max send amount ${_maxSendAmount!.toString()} ${_sendCurrency!.ticker.toUpperCase()}";
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}
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}
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}
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return "";
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}
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//============================================================================
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// public state updaters
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//============================================================================
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Future<void> updateExchange({
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required Exchange exchange,
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required bool shouldUpdateData,
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required bool shouldNotifyListeners,
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}) async {
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_exchange = exchange;
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if (shouldUpdateData) {
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await _updateRangesAndEstimate(
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shouldNotifyListeners: false,
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);
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}
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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void setCurrencies(AggregateCurrency? from, AggregateCurrency? to) {
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_sendCurrency = from;
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_receiveCurrency = to;
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}
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void reset({
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required bool shouldNotifyListeners,
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}) {
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_exchange = null;
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_reversed = false;
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_rate = null;
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_sendAmount = null;
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_receiveAmount = null;
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_sendCurrency = null;
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_receiveCurrency = null;
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_minSendAmount = null;
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_minReceiveAmount = null;
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_maxSendAmount = null;
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_maxReceiveAmount = null;
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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Future<void> setSendAmountAndCalculateReceiveAmount(
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Decimal? newSendAmount,
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bool shouldNotifyListeners,
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) async {
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if (newSendAmount == null) {
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// todo: check if this breaks things and stuff
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_receiveAmount = null;
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_sendAmount = null;
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} else {
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if (newSendAmount <= Decimal.zero) {
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_receiveAmount = Decimal.zero;
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}
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_sendAmount = newSendAmount;
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_reversed = false;
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await _updateRangesAndEstimate(
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shouldNotifyListeners: false,
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);
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}
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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Future<void> setReceivingAmountAndCalculateSendAmount(
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Decimal? newReceiveAmount,
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bool shouldNotifyListeners,
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) async {
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if (newReceiveAmount == null) {
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// todo: check if this breaks things and stuff
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_receiveAmount = null;
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_sendAmount = null;
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} else {
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if (newReceiveAmount <= Decimal.zero) {
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_sendAmount = Decimal.zero;
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}
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_receiveAmount = newReceiveAmount;
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_reversed = true;
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await _updateRangesAndEstimate(
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shouldNotifyListeners: false,
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);
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}
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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Future<void> updateSendCurrency(
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AggregateCurrency sendCurrency,
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bool shouldNotifyListeners,
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) async {
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try {
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_sendCurrency = sendCurrency;
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_minSendAmount = null;
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_maxSendAmount = null;
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if (_receiveCurrency == null) {
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_rate = null;
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} else {
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await _updateRangesAndEstimate(
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shouldNotifyListeners: false,
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);
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}
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if (shouldNotifyListeners) {
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_notify();
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}
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} catch (e, s) {
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Logging.instance.log("$e\n$s", level: LogLevel.Error);
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}
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}
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Future<void> updateReceivingCurrency(
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AggregateCurrency receiveCurrency,
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bool shouldNotifyListeners,
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) async {
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try {
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_receiveCurrency = receiveCurrency;
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_minReceiveAmount = null;
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_maxReceiveAmount = null;
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if (_sendCurrency == null) {
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_rate = null;
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} else {
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await _updateRangesAndEstimate(
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shouldNotifyListeners: false,
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);
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}
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if (shouldNotifyListeners) {
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_notify();
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}
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} catch (e, s) {
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Logging.instance.log("$e\n$s", level: LogLevel.Error);
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}
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}
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Future<void> swap({
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required bool shouldNotifyListeners,
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}) async {
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final Decimal? temp = sendAmount;
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_sendAmount = receiveAmount;
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_receiveAmount = temp;
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_minSendAmount = null;
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_maxSendAmount = null;
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_minReceiveAmount = null;
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_maxReceiveAmount = null;
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final AggregateCurrency? tmp = sendCurrency;
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_sendCurrency = receiveCurrency;
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_receiveCurrency = tmp;
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await _updateRangesAndEstimate(
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shouldNotifyListeners: false,
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);
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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Future<void> refresh() => _updateRangesAndEstimate(
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shouldNotifyListeners: true,
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);
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//============================================================================
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// private state updaters
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//============================================================================
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Future<void> _updateRangesAndEstimate({
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required bool shouldNotifyListeners,
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}) async {
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try {
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switch (exchange.name) {
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case ChangeNowExchange.exchangeName:
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if (!_exchangeSupported(
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exchangeName: exchange.name,
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sendCurrency: sendCurrency,
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receiveCurrency: receiveCurrency,
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exchangeRateType: exchangeRateType,
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)) {
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_exchange = MajesticBankExchange.instance;
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}
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break;
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case MajesticBankExchange.exchangeName:
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if (!_exchangeSupported(
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exchangeName: exchange.name,
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sendCurrency: sendCurrency,
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receiveCurrency: receiveCurrency,
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exchangeRateType: exchangeRateType,
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)) {
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_exchange = ChangeNowExchange.instance;
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}
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break;
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}
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await _updateRanges(shouldNotifyListeners: false);
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await _updateEstimate(shouldNotifyListeners: false);
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if (shouldNotifyListeners) {
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_notify();
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}
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} catch (_) {
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//
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}
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}
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Future<void> _updateRanges({
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required bool shouldNotifyListeners,
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}) async {
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// if (exchange?.name == SimpleSwapExchange.exchangeName) {
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// reversed = false;
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// }
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final _send = sendCurrency;
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final _receive = receiveCurrency;
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if (_send == null || _receive == null) {
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Logging.instance.log(
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"Tried to $runtimeType.updateRanges where ( $_send || $_receive) for: $exchange",
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level: LogLevel.Info,
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);
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return;
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}
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final response = await exchange.getRange(
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_send.ticker,
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_receive.ticker,
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exchangeRateType == ExchangeRateType.fixed,
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);
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if (response.value == null) {
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Logging.instance.log(
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"Tried to $runtimeType.updateRanges for: $exchange where response: $response",
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level: LogLevel.Info,
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);
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return;
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}
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final responseReversed = await exchange.getRange(
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_receive.ticker,
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_send.ticker,
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exchangeRateType == ExchangeRateType.fixed,
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);
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if (responseReversed.value == null) {
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Logging.instance.log(
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"Tried to $runtimeType.updateRanges for: $exchange where response: $responseReversed",
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level: LogLevel.Info,
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);
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return;
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}
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final range = response.value!;
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final rangeReversed = responseReversed.value!;
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_minSendAmount = range.min;
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_maxSendAmount = range.max;
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_minReceiveAmount = rangeReversed.min;
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_maxReceiveAmount = rangeReversed.max;
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//todo: check if print needed
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// debugPrint(
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// "updated range for: $exchange for $_fromTicker-$_toTicker: $range");
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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Future<void> _updateEstimate({
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required bool shouldNotifyListeners,
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}) async {
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// if (exchange?.name == SimpleSwapExchange.exchangeName) {
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// reversed = false;
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// }
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final amount = reversed ? receiveAmount : sendAmount;
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if (sendCurrency == null ||
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receiveCurrency == null ||
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amount == null ||
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amount <= Decimal.zero) {
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Logging.instance.log(
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"Tried to $runtimeType.updateEstimate for: $exchange where (from: $sendCurrency || to: $receiveCurrency || amount: $amount)",
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level: LogLevel.Info,
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);
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return;
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}
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final response = await exchange.getEstimate(
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sendCurrency!.ticker,
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receiveCurrency!.ticker,
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amount,
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exchangeRateType == ExchangeRateType.fixed,
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reversed,
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);
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if (response.value == null) {
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Logging.instance.log(
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"Tried to $runtimeType.updateEstimate for: $exchange where response: $response",
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level: LogLevel.Info,
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);
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return;
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}
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_estimate = response.value!;
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if (reversed) {
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_sendAmount = _estimate!.estimatedAmount;
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} else {
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_receiveAmount = _estimate!.estimatedAmount;
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}
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_rate =
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(receiveAmount! / sendAmount!).toDecimal(scaleOnInfinitePrecision: 12);
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//todo: check if print needed
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// debugPrint(
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// "updated estimate for: $exchange for $fromTicker-$toTicker: $estimate");
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if (shouldNotifyListeners) {
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_notify();
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}
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}
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//============================================================================
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void _notify() {
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debugPrint("ExFState NOTIFY: ${toString()}");
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notifyListeners();
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}
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bool _exchangeSupported({
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required String exchangeName,
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required AggregateCurrency? sendCurrency,
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required AggregateCurrency? receiveCurrency,
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required ExchangeRateType exchangeRateType,
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}) {
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final send = sendCurrency?.forExchange(exchangeName);
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if (send == null) return false;
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final rcv = receiveCurrency?.forExchange(exchangeName);
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if (rcv == null) return false;
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if (exchangeRateType == ExchangeRateType.fixed) {
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return send.supportsFixedRate && rcv.supportsFixedRate;
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} else {
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return send.supportsEstimatedRate && rcv.supportsEstimatedRate;
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}
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}
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@override
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String toString() {
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return "{"
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"\n\t exchange: $exchange,"
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"\n\t exchangeRateType: $exchangeRateType,"
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"\n\t sendCurrency: $sendCurrency,"
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"\n\t receiveCurrency: $receiveCurrency,"
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"\n\t rate: $rate,"
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"\n\t reversed: $reversed,"
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"\n\t sendAmount: $sendAmount,"
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"\n\t receiveAmount: $receiveAmount,"
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"\n\t estimate: $estimate,"
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"\n\t minSendAmount: $minSendAmount,"
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"\n\t maxSendAmount: $maxSendAmount,"
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"\n\t minReceiveAmount: $minReceiveAmount,"
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"\n\t maxReceiveAmount: $maxReceiveAmount,"
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"\n\t canExchange: $canExchange,"
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"\n\t warning: $warning,"
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"\n}";
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}
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}
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