cake_wallet/lib/src/screens/exchange/exchange_page.dart

import 'package:cake_wallet/core/auth_service.dart';
import 'package:cake_wallet/di.dart';
import 'package:cake_wallet/src/screens/exchange/widgets/desktop_exchange_cards_section.dart';
import 'package:cake_wallet/src/screens/exchange/widgets/mobile_exchange_cards_section.dart';
import 'package:cake_wallet/src/widgets/add_template_button.dart';
import 'package:cake_wallet/themes/theme_base.dart';
import 'package:cake_wallet/utils/debounce.dart';
import 'package:cake_wallet/utils/responsive_layout_util.dart';
import 'package:cw_core/sync_status.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:cake_wallet/entities/parse_address_from_domain.dart';
import 'package:cake_wallet/src/screens/send/widgets/extract_address_from_parsed.dart';
import 'package:cake_wallet/src/widgets/standard_checkbox.dart';
import 'package:flutter/material.dart';
import 'package:flutter_mobx/flutter_mobx.dart';
import 'package:keyboard_actions/keyboard_actions.dart';
import 'package:mobx/mobx.dart';
import 'package:cake_wallet/exchange/exchange_template.dart';
import 'package:cake_wallet/exchange/exchange_trade_state.dart';
import 'package:cake_wallet/exchange/limits_state.dart';
import 'package:cake_wallet/src/screens/base_page.dart';
import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
import 'package:cake_wallet/src/widgets/keyboard_done_button.dart';
import 'package:cake_wallet/src/widgets/template_tile.dart';
import 'package:cake_wallet/src/widgets/trail_button.dart';
import 'package:cake_wallet/utils/show_pop_up.dart';
import 'package:cake_wallet/routes.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:cw_core/crypto_currency.dart';
import 'package:cake_wallet/src/screens/exchange/widgets/exchange_card.dart';
import 'package:cake_wallet/src/widgets/primary_button.dart';
import 'package:cake_wallet/src/widgets/scollable_with_bottom_section.dart';
import 'package:cake_wallet/src/widgets/alert_with_one_action.dart';
import 'package:cake_wallet/view_model/exchange/exchange_view_model.dart';
import 'package:cake_wallet/core/address_validator.dart';
import 'package:cake_wallet/core/amount_validator.dart';
import 'package:cake_wallet/src/screens/exchange/widgets/present_provider_picker.dart';
import 'package:cake_wallet/src/screens/dashboard/widgets/sync_indicator_icon.dart';

class ExchangePage extends BasePage {
  ExchangePage(this.exchangeViewModel, this.authService) {
    depositWalletName = exchangeViewModel.depositCurrency == CryptoCurrency.xmr
        ? exchangeViewModel.wallet.name
        : null;
    receiveWalletName = exchangeViewModel.receiveCurrency == CryptoCurrency.xmr
        ? exchangeViewModel.wallet.name
        : null;
  }

  final ExchangeViewModel exchangeViewModel;
  final AuthService authService;
  final depositKey = GlobalKey<ExchangeCardState>();
  final receiveKey = GlobalKey<ExchangeCardState>();
  final _formKey = GlobalKey<FormState>();
  final _depositAmountFocus = FocusNode();
  final _depositAddressFocus = FocusNode();
  final _receiveAmountFocus = FocusNode();
  final _receiveAddressFocus = FocusNode();
  final _receiveAmountDebounce = Debounce(Duration(milliseconds: 500));
  final _depositAmountDebounce = Debounce(Duration(milliseconds: 500));
  var _isReactionsSet = false;

  final arrowBottomPurple = Image.asset(
    'assets/images/arrow_bottom_purple_icon.png',
    color: Colors.white,
    height: 8,
  );
  final arrowBottomCakeGreen = Image.asset(
    'assets/images/arrow_bottom_cake_green.png',
    color: Colors.white,
    height: 8,
  );

  late final String? depositWalletName;
  late final String? receiveWalletName;

  @override
  String get title => S.current.exchange;

  @override
  Color get titleColor => Colors.white;

  @override
  bool get resizeToAvoidBottomInset => false;

  @override
  bool get extendBodyBehindAppBar => true;

  @override
  AppBarStyle get appBarStyle => AppBarStyle.transparent;

  @override
  Widget middle(BuildContext context) => Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Padding(
              padding: const EdgeInsets.only(right: 6.0),
              child: Observer(
                builder: (_) =>
                    SyncIndicatorIcon(isSynced: exchangeViewModel.status is SyncedSyncStatus),
              )),
          PresentProviderPicker(exchangeViewModel: exchangeViewModel)
        ],
      );

  @override
  Widget trailing(BuildContext context) => TrailButton(
      caption: S.of(context).reset,
      onPressed: () {
        _formKey.currentState?.reset();
        exchangeViewModel.reset();
      });

  @override
  Widget? leading(BuildContext context) {
    final _backButton = Icon(
      Icons.arrow_back_ios,
      color: titleColor,
      size: 16,
    );
    final _closeButton =
        currentTheme.type == ThemeType.dark ? closeButtonImageDarkTheme : closeButtonImage;

    bool isMobileView = ResponsiveLayoutUtil.instance.isMobile;

    return MergeSemantics(
      child: SizedBox(
        height: isMobileView ? 37 : 45,
        width: isMobileView ? 37 : 45,
        child: ButtonTheme(
          minWidth: double.minPositive,
          child: Semantics(
            label: !isMobileView ? S.of(context).close : S.of(context).seed_alert_back,
            child: TextButton(
              style: ButtonStyle(
                overlayColor: MaterialStateColor.resolveWith((states) => Colors.transparent),
              ),
              onPressed: () => onClose(context),
              child: !isMobileView ? _closeButton : _backButton,
            ),
          ),
        ),
      ),
    );
  }

  @override
  Widget body(BuildContext context) {
    WidgetsBinding.instance.addPostFrameCallback((_) => _setReactions(context, exchangeViewModel));

    return KeyboardActions(
        disableScroll: true,
        config: KeyboardActionsConfig(
            keyboardActionsPlatform: KeyboardActionsPlatform.IOS,
            keyboardBarColor: Theme.of(context).accentTextTheme.bodyLarge!.backgroundColor!,
            nextFocus: false,
            actions: [
              KeyboardActionsItem(
                  focusNode: _depositAmountFocus, toolbarButtons: [(_) => KeyboardDoneButton()]),
              KeyboardActionsItem(
                  focusNode: _receiveAmountFocus, toolbarButtons: [(_) => KeyboardDoneButton()])
            ]),
        child: Container(
          color: Theme.of(context).colorScheme.background,
          child: Form(
              key: _formKey,
              child: ScrollableWithBottomSection(
                contentPadding: EdgeInsets.only(bottom: 24),
                content: Observer(
                  builder: (_) => Column(
                    children: <Widget>[
                      _exchangeCardsSection(context),
                      Padding(
                          padding: EdgeInsets.only(top: 12, left: 24),
                          child: Row(
                            mainAxisAlignment: MainAxisAlignment.start,
                            children: [
                              StandardCheckbox(
                                value: exchangeViewModel.isFixedRateMode,
                                caption: S.of(context).fixed_rate,
                                onChanged: (value) => exchangeViewModel.isFixedRateMode = value,
                              ),
                            ],
                          )),
                      SizedBox(height: 30),
                      _buildTemplateSection(context)
                    ],
                  ),
                ),
                bottomSectionPadding: EdgeInsets.only(left: 24, right: 24, bottom: 24),
                bottomSection: Column(children: <Widget>[
                  Padding(
                    padding: EdgeInsets.only(bottom: 15),
                    child: Observer(builder: (_) {
                      final description = exchangeViewModel.isFixedRateMode
                          ? exchangeViewModel.isAvailableInSelected
                              ? S.of(context).amount_is_guaranteed
                              : S.of(context).fixed_pair_not_supported
                          : exchangeViewModel.isAvailableInSelected
                              ? S.of(context).amount_is_estimate
                              : S.of(context).variable_pair_not_supported;
                      return Center(
                        child: Text(
                          description,
                          textAlign: TextAlign.center,
                          style: TextStyle(
                              color: Theme.of(context)
                                  .primaryTextTheme.displayLarge!
                                  .decorationColor!,
                              fontWeight: FontWeight.w500,
                              fontSize: 12),
                        ),
                      );
                    }),
                  ),
                  Observer(
                      builder: (_) => LoadingPrimaryButton(
                          text: S.of(context).exchange,
                          onPressed: () {
                            if (_formKey.currentState != null &&
                                _formKey.currentState!.validate()) {
                              if ((exchangeViewModel.depositCurrency == CryptoCurrency.xmr) &&
                                  (!(exchangeViewModel.status is SyncedSyncStatus))) {
                                showPopUp<void>(
                                    context: context,
                                    builder: (BuildContext context) {
                                      return AlertWithOneAction(
                                          alertTitle: S.of(context).exchange,
                                          alertContent: S.of(context).exchange_sync_alert_content,
                                          buttonText: S.of(context).ok,
                                          buttonAction: () => Navigator.of(context).pop());
                                    });
                              } else {
                                final check = exchangeViewModel.shouldDisplayTOTP();
                                authService.authenticateAction(
                                  context,
                                  conditionToDetermineIfToUse2FA: check,
                                  onAuthSuccess: (value) {
                                    if (value) {
                                      exchangeViewModel.createTrade();
                                    }
                                  },
                                );
                              }
                            }
                          },
                          color: Theme.of(context).accentTextTheme.bodyLarge!.color!,
                          textColor: Colors.white,
                          isDisabled: exchangeViewModel.selectedProviders.isEmpty,
                          isLoading: exchangeViewModel.tradeState is TradeIsCreating)),
                ]),
              )),
        ));
  }

  Widget _buildTemplateSection(BuildContext context) {
    return Container(
      height: 40,
      width: double.infinity,
      padding: EdgeInsets.only(left: 24),
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: Observer(
          builder: (_) {
            final templates = exchangeViewModel.templates;

            return Row(
              children: <Widget>[
                AddTemplateButton(
                  onTap: () => Navigator.of(context).pushNamed(Routes.exchangeTemplate),
                  currentTemplatesLength: templates.length,
                ),
                ListView.builder(
                  scrollDirection: Axis.horizontal,
                  shrinkWrap: true,
                  physics: NeverScrollableScrollPhysics(),
                  itemCount: templates.length,
                  itemBuilder: (context, index) {
                    final template = templates[index];

                    return TemplateTile(
                      key: UniqueKey(),
                      amount: template.amount,
                      from: template.depositCurrencyTitle,
                      to: template.receiveCurrencyTitle,
                      onTap: () {
                        applyTemplate(context, exchangeViewModel, template);
                      },
                      onRemove: () {
                        showPopUp<void>(
                            context: context,
                            builder: (dialogContext) {
                              return AlertWithTwoActions(
                                  alertTitle: S.of(context).template,
                                  alertContent: S.of(context).confirm_delete_template,
                                  rightButtonText: S.of(context).delete,
                                  leftButtonText: S.of(context).cancel,
                                  actionRightButton: () {
                                    Navigator.of(dialogContext).pop();
                                    exchangeViewModel.removeTemplate(template: template);
                                    exchangeViewModel.updateTemplate();
                                  },
                                  actionLeftButton: () => Navigator.of(dialogContext).pop());
                            });
                      },
                    );
                  },
                ),
              ],
            );
          },
        ),
      ),
    );
  }

  void applyTemplate(
      BuildContext context, ExchangeViewModel exchangeViewModel, ExchangeTemplate template) async {
    exchangeViewModel.changeDepositCurrency(
        currency: CryptoCurrency.fromString(template.depositCurrency));
    exchangeViewModel.changeReceiveCurrency(
        currency: CryptoCurrency.fromString(template.receiveCurrency));

    exchangeViewModel.changeDepositAmount(amount: template.amount);
    exchangeViewModel.depositAddress = template.depositAddress;
    exchangeViewModel.receiveAddress = template.receiveAddress;
    exchangeViewModel.isReceiveAmountEntered = false;
    exchangeViewModel.isFixedRateMode = false;

    var domain = template.depositAddress;
    var ticker = template.depositCurrency.toLowerCase();
    exchangeViewModel.depositAddress = await fetchParsedAddress(context, domain, ticker);

    domain = template.receiveAddress;
    ticker = template.receiveCurrency.toLowerCase();
    exchangeViewModel.receiveAddress = await fetchParsedAddress(context, domain, ticker);
  }

  void _setReactions(BuildContext context, ExchangeViewModel exchangeViewModel) {
    if (_isReactionsSet) {
      return;
    }

    if (exchangeViewModel.isLowFee) {
      _showFeeAlert(context);
    }

    final depositAddressController = depositKey.currentState!.addressController;
    final depositAmountController = depositKey.currentState!.amountController;
    final receiveAddressController = receiveKey.currentState!.addressController;
    final receiveAmountController = receiveKey.currentState!.amountController;
    final limitsState = exchangeViewModel.limitsState;

    if (limitsState is LimitsLoadedSuccessfully) {
      final min = limitsState.limits.min != null ? limitsState.limits.min.toString() : null;
      final max = limitsState.limits.max != null ? limitsState.limits.max.toString() : null;
      final key = exchangeViewModel.isFixedRateMode ? receiveKey : depositKey;
      key.currentState!.changeLimits(min: min, max: max);
    }

    _onCurrencyChange(exchangeViewModel.receiveCurrency, exchangeViewModel, receiveKey);
    _onCurrencyChange(exchangeViewModel.depositCurrency, exchangeViewModel, depositKey);

    reaction(
        (_) => exchangeViewModel.wallet.name,
        (String _) =>
            _onWalletNameChange(exchangeViewModel, exchangeViewModel.receiveCurrency, receiveKey));

    reaction(
        (_) => exchangeViewModel.wallet.name,
        (String _) =>
            _onWalletNameChange(exchangeViewModel, exchangeViewModel.depositCurrency, depositKey));

    reaction((_) => exchangeViewModel.receiveCurrency,
        (CryptoCurrency currency) => _onCurrencyChange(currency, exchangeViewModel, receiveKey));

    reaction((_) => exchangeViewModel.depositCurrency,
        (CryptoCurrency currency) => _onCurrencyChange(currency, exchangeViewModel, depositKey));

    reaction((_) => exchangeViewModel.depositAmount, (String amount) {
      if (depositKey.currentState!.amountController.text != amount) {
        depositKey.currentState!.amountController.text = amount;
      }
    });

    reaction((_) => exchangeViewModel.depositAddress, (String address) {
      if (depositKey.currentState!.addressController.text != address) {
        depositKey.currentState!.addressController.text = address;
      }
    });

    reaction((_) => exchangeViewModel.isDepositAddressEnabled, (bool isEnabled) {
      depositKey.currentState!.isAddressEditable(isEditable: isEnabled);
    });

    reaction((_) => exchangeViewModel.receiveAmount, (String amount) {
      if (receiveKey.currentState!.amountController.text != amount) {
        receiveKey.currentState!.amountController.text = amount;
      }
    });

    reaction((_) => exchangeViewModel.receiveAddress, (String address) {
      if (receiveKey.currentState!.addressController.text != address) {
        receiveKey.currentState!.addressController.text = address;
      }
    });

    reaction((_) => exchangeViewModel.isReceiveAddressEnabled, (bool isEnabled) {
      receiveKey.currentState!.isAddressEditable(isEditable: isEnabled);
    });

    reaction((_) => exchangeViewModel.isReceiveAmountEditable, (bool isReceiveAmountEditable) {
      receiveKey.currentState!.isAmountEditable(isEditable: isReceiveAmountEditable);
    });

    reaction((_) => exchangeViewModel.tradeState, (ExchangeTradeState state) {
      if (state is TradeIsCreatedFailure) {
        WidgetsBinding.instance.addPostFrameCallback((_) {
          showPopUp<void>(
              context: context,
              builder: (BuildContext context) {
                return AlertWithOneAction(
                    alertTitle: S.of(context).provider_error(state.title),
                    alertContent: state.error,
                    buttonText: S.of(context).ok,
                    buttonAction: () => Navigator.of(context).pop());
              });
        });
      }
      if (state is TradeIsCreatedSuccessfully) {
        exchangeViewModel.reset();
        Navigator.of(context).pushNamed(Routes.exchangeConfirm);
      }
    });

    reaction((_) => exchangeViewModel.limitsState, (LimitsState state) {
      String? min;
      String? max;

      if (state is LimitsLoadedSuccessfully) {
        min = state.limits.min != null ? state.limits.min.toString() : null;
        max = state.limits.max != null ? state.limits.max.toString() : null;
      }

      if (state is LimitsLoadedFailure) {
        min = '0';
        max = '0';
      }

      if (state is LimitsIsLoading) {
        min = '...';
        max = '...';
      }

      if (exchangeViewModel.isFixedRateMode) {
        depositKey.currentState!.changeLimits(min: null, max: null);
        receiveKey.currentState!.changeLimits(min: min, max: max);
      } else {
        depositKey.currentState!.changeLimits(min: min, max: max);
        receiveKey.currentState!.changeLimits(min: null, max: null);
      }
    });

    depositAddressController
        .addListener(() => exchangeViewModel.depositAddress = depositAddressController.text);

    depositAmountController.addListener(() {
      if (depositAmountController.text != exchangeViewModel.depositAmount) {
        _depositAmountDebounce.run(() {
          exchangeViewModel.changeDepositAmount(amount: depositAmountController.text);
          exchangeViewModel.isReceiveAmountEntered = false;
        });
      }
    });

    receiveAddressController
        .addListener(() => exchangeViewModel.receiveAddress = receiveAddressController.text);

    receiveAmountController.addListener(() {
      if (receiveAmountController.text != exchangeViewModel.receiveAmount) {
        _receiveAmountDebounce.run(() {
          exchangeViewModel.changeReceiveAmount(amount: receiveAmountController.text);
          exchangeViewModel.isReceiveAmountEntered = true;
        });
      }
    });

    reaction((_) => exchangeViewModel.wallet.walletAddresses.address, (String address) {
      if (exchangeViewModel.depositCurrency == CryptoCurrency.xmr) {
        depositKey.currentState!.changeAddress(address: address);
      }

      if (exchangeViewModel.receiveCurrency == CryptoCurrency.xmr) {
        receiveKey.currentState!.changeAddress(address: address);
      }
    });

    _depositAddressFocus.addListener(() async {
      if (!_depositAddressFocus.hasFocus && depositAddressController.text.isNotEmpty) {
        final domain = depositAddressController.text;
        final ticker = exchangeViewModel.depositCurrency.title.toLowerCase();
        exchangeViewModel.depositAddress = await fetchParsedAddress(context, domain, ticker);
      }
    });

    _receiveAddressFocus.addListener(() async {
      if (!_receiveAddressFocus.hasFocus && receiveAddressController.text.isNotEmpty) {
        final domain = receiveAddressController.text;
        final ticker = exchangeViewModel.receiveCurrency.title.toLowerCase();
        exchangeViewModel.receiveAddress = await fetchParsedAddress(context, domain, ticker);
      }
    });

    _receiveAmountFocus.addListener(() {
      if (_receiveAmountFocus.hasFocus) {
        exchangeViewModel.isFixedRateMode = true;
      }
      // exchangeViewModel.changeReceiveAmount(amount: receiveAmountController.text);
    });

    _depositAmountFocus.addListener(() {
      exchangeViewModel.isFixedRateMode = false;
      // exchangeViewModel.changeDepositAmount(
      //   amount: depositAmountController.text);
    });

    _isReactionsSet = true;
  }

  void _onCurrencyChange(CryptoCurrency currency, ExchangeViewModel exchangeViewModel,
      GlobalKey<ExchangeCardState> key) {
    final isCurrentTypeWallet = currency == exchangeViewModel.wallet.currency;

    key.currentState!.changeSelectedCurrency(currency);
    key.currentState!.changeWalletName(isCurrentTypeWallet ? exchangeViewModel.wallet.name : '');

    key.currentState!.changeAddress(
        address: isCurrentTypeWallet ? exchangeViewModel.wallet.walletAddresses.address : '');

    key.currentState!.changeAmount(amount: '');
  }

  void _onWalletNameChange(ExchangeViewModel exchangeViewModel, CryptoCurrency currency,
      GlobalKey<ExchangeCardState> key) {
    final isCurrentTypeWallet = currency == exchangeViewModel.wallet.currency;

    if (isCurrentTypeWallet) {
      key.currentState!.changeWalletName(exchangeViewModel.wallet.name);
      key.currentState!.addressController.text = exchangeViewModel.wallet.walletAddresses.address;
    } else if (key.currentState!.addressController.text ==
        exchangeViewModel.wallet.walletAddresses.address) {
      key.currentState!.changeWalletName('');
      key.currentState!.addressController.text = '';
    }
  }

  Future<String> fetchParsedAddress(BuildContext context, String domain, String ticker) async {
    final parsedAddress = await getIt.get<AddressResolver>().resolve(domain, ticker);
    final address = await extractAddressFromParsed(context, parsedAddress);
    return address;
  }

  void _showFeeAlert(BuildContext context) async {
    await Future<void>.delayed(Duration(seconds: 1));
    final confirmed = await showPopUp<bool>(
            context: context,
            builder: (dialogContext) {
              return AlertWithTwoActions(
                  alertTitle: S.of(context).low_fee,
                  alertContent: S.of(context).low_fee_alert,
                  leftButtonText: S.of(context).ignor,
                  rightButtonText: S.of(context).use_suggested,
                  actionLeftButton: () => Navigator.of(dialogContext).pop(false),
                  actionRightButton: () => Navigator.of(dialogContext).pop(true));
            }) ??
        false;
    if (confirmed) {
      exchangeViewModel.setDefaultTransactionPriority();
    }
  }

  void disposeBestRateSync() => exchangeViewModel.bestRateSync.cancel();

  Widget _exchangeCardsSection(BuildContext context) {
    final firstExchangeCard = Observer(
        builder: (_) => ExchangeCard(
              onDispose: disposeBestRateSync,
              hasAllAmount: exchangeViewModel.hasAllAmount,
              allAmount: exchangeViewModel.hasAllAmount
                  ? () => exchangeViewModel.calculateDepositAllAmount()
                  : null,
              amountFocusNode: _depositAmountFocus,
              addressFocusNode: _depositAddressFocus,
              key: depositKey,
              title: S.of(context).you_will_send,
              initialCurrency: exchangeViewModel.depositCurrency,
              initialWalletName: depositWalletName ?? '',
              initialAddress: exchangeViewModel.depositCurrency == exchangeViewModel.wallet.currency
                  ? exchangeViewModel.wallet.walletAddresses.address
                  : exchangeViewModel.depositAddress,
              initialIsAmountEditable: true,
              initialIsAddressEditable: exchangeViewModel.isDepositAddressEnabled,
              isAmountEstimated: false,
              hasRefundAddress: true,
              isMoneroWallet: exchangeViewModel.isMoneroWallet,
              currencies: exchangeViewModel.depositCurrencies,
              onCurrencySelected: (currency) {
                // FIXME: need to move it into view model
                if (currency == CryptoCurrency.xmr &&
                    exchangeViewModel.wallet.type != WalletType.monero) {
                  showPopUp<void>(
                      context: context,
                      builder: (dialogContext) {
                        return AlertWithOneAction(
                            alertTitle: S.of(context).error,
                            alertContent: S.of(context).exchange_incorrect_current_wallet_for_xmr,
                            buttonText: S.of(context).ok,
                            buttonAction: () => Navigator.of(dialogContext).pop());
                      });
                  return;
                }

                exchangeViewModel.changeDepositCurrency(currency: currency);
              },
              imageArrow: arrowBottomPurple,
              currencyButtonColor: Colors.transparent,
              addressButtonsColor: Theme.of(context).focusColor,
              borderColor: Theme.of(context).primaryTextTheme.bodyLarge!.color!,
              currencyValueValidator: (value) {
                return !exchangeViewModel.isFixedRateMode
                    ? AmountValidator(
                        isAutovalidate: true,
                        currency: exchangeViewModel.depositCurrency,
                        minValue: exchangeViewModel.limits.min.toString(),
                        maxValue: exchangeViewModel.limits.max.toString(),
                      ).call(value)
                    : null;
              },
              addressTextFieldValidator: AddressValidator(type: exchangeViewModel.depositCurrency),
              onPushPasteButton: (context) async {
                final domain = exchangeViewModel.depositAddress;
                final ticker = exchangeViewModel.depositCurrency.title.toLowerCase();
                exchangeViewModel.depositAddress =
                    await fetchParsedAddress(context, domain, ticker);
              },
              onPushAddressBookButton: (context) async {
                final domain = exchangeViewModel.depositAddress;
                final ticker = exchangeViewModel.depositCurrency.title.toLowerCase();
                exchangeViewModel.depositAddress =
                    await fetchParsedAddress(context, domain, ticker);
              },
            ));

    final secondExchangeCard = Observer(
        builder: (_) => ExchangeCard(
              onDispose: disposeBestRateSync,
              amountFocusNode: _receiveAmountFocus,
              addressFocusNode: _receiveAddressFocus,
              key: receiveKey,
              title: S.of(context).you_will_get,
              initialCurrency: exchangeViewModel.receiveCurrency,
              initialWalletName: receiveWalletName ?? '',
              initialAddress: exchangeViewModel.receiveCurrency == exchangeViewModel.wallet.currency
                  ? exchangeViewModel.wallet.walletAddresses.address
                  : exchangeViewModel.receiveAddress,
              initialIsAmountEditable: exchangeViewModel.isReceiveAmountEditable,
              initialIsAddressEditable: exchangeViewModel.isReceiveAddressEnabled,
              isAmountEstimated: true,
              isMoneroWallet: exchangeViewModel.isMoneroWallet,
              currencies: exchangeViewModel.receiveCurrencies,
              onCurrencySelected: (currency) =>
                  exchangeViewModel.changeReceiveCurrency(currency: currency),
              imageArrow: arrowBottomCakeGreen,
              currencyButtonColor: Colors.transparent,
              addressButtonsColor: Theme.of(context).focusColor,
              borderColor: Theme.of(context).primaryTextTheme.bodyLarge!.decorationColor!,
              currencyValueValidator: (value) {
                return exchangeViewModel.isFixedRateMode
                    ? AmountValidator(
                        isAutovalidate: true,
                        currency: exchangeViewModel.receiveCurrency,
                        minValue: exchangeViewModel.limits.min.toString(),
                        maxValue: exchangeViewModel.limits.max.toString(),
                      ).call(value)
                    : null;
              },
              addressTextFieldValidator: AddressValidator(type: exchangeViewModel.receiveCurrency),
              onPushPasteButton: (context) async {
                final domain = exchangeViewModel.receiveAddress;
                final ticker = exchangeViewModel.receiveCurrency.title.toLowerCase();
                exchangeViewModel.receiveAddress =
                    await fetchParsedAddress(context, domain, ticker);
              },
              onPushAddressBookButton: (context) async {
                final domain = exchangeViewModel.receiveAddress;
                final ticker = exchangeViewModel.receiveCurrency.title.toLowerCase();
                exchangeViewModel.receiveAddress =
                    await fetchParsedAddress(context, domain, ticker);
              },
            ));

    if (ResponsiveLayoutUtil.instance.isMobile) {
      return MobileExchangeCardsSection(
        firstExchangeCard: firstExchangeCard,
        secondExchangeCard: secondExchangeCard,
      );
    }

    return DesktopExchangeCardsSection(
      firstExchangeCard: firstExchangeCard,
      secondExchangeCard: secondExchangeCard,
    );
  }
}