feat: update fee calculation for withdraw (#1226)

Co-authored-by: ookami-kb <ookami.kb@gmail.com>

packages/espressocash_app/lib/features/fees/models/fee_type.dart

@@ -16,5 +16,6 @@ sealed class FeeType with _$FeeType {
   const factory FeeType.withdraw({
     required int amount,
     required RampPartner partner,
+    required Ed25519HDPublicKey? address,
   }) = FeeTypeWithdraw;
 }

packages/espressocash_app/lib/features/fees/src/services/fee_calculator.dart

@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:espressocash_api/espressocash_api.dart';
 import 'package:injectable/injectable.dart';
 import 'package:solana/solana.dart';
@@ -19,29 +21,36 @@ class FeeCalculator {
         (fees) async {
           switch (type) {
             case FeeTypeDirect(:final address):
-              final hasAta = await _solanaClient.hasAssociatedTokenAccount(
-                owner: address,
-                mint: Token.usdc.publicKey,
-              );
-
-              return hasAta
+              return await _hasUsdcAta(address)
                   ? fees.directPayment.ataExists
                   : fees.directPayment.ataDoesNotExist;
             case FeeTypeLink():
               return fees.escrowPayment;
-            case FeeTypeWithdraw(:final amount, :final partner):
-              final feePercentage = switch (partner) {
+            case FeeTypeWithdraw(:final amount, :final partner, :final address):
+              final percentageFee = switch (partner) {
                 RampPartner.scalex => fees.withdrawFeePercentage.scalex,
                 RampPartner.coinflow => fees.withdrawFeePercentage.coinflow,
                 RampPartner.guardarian => fees.withdrawFeePercentage.guardarian,
                 RampPartner.rampNetwork =>
                   fees.withdrawFeePercentage.rampNetwork,
                 RampPartner.kado => fees.withdrawFeePercentage.kado,
               };
-              final calculatedFee = (amount * feePercentage).ceil();
+              final percentageFeeAmount = (amount * percentageFee).ceil();
 
-              return fees.directPayment.ataExists + calculatedFee;
+              final accountCreationFeeAmount = address == null
+                  ? 0
+                  : await _hasUsdcAta(address)
+                      ? fees.directPayment.ataExists
+                      : fees.directPayment.ataDoesNotExist;
+
+              return max(percentageFeeAmount, accountCreationFeeAmount);
           }
         },
       ).then((fee) => CryptoAmount(value: fee, cryptoCurrency: Currency.usdc));
+
+  Future<bool> _hasUsdcAta(Ed25519HDPublicKey address) =>
+      _solanaClient.hasAssociatedTokenAccount(
+        owner: address,
+        mint: Token.usdc.publicKey,
+      );
 }

packages/espressocash_app/lib/features/ramp/services/off_ramp_order_service.dart

@@ -38,6 +38,7 @@ typedef OffRampOrder = ({
   DateTime? resolved,
   FiatAmount? receiveAmount,
   String partnerOrderId,
+  Ed25519HDPublicKey? depositAddress,
 });
 
 @Singleton(scope: authScope)
@@ -112,6 +113,10 @@ class OffRampOrderService implements Disposable {
         ) as FiatAmount,
       );
 
+      final depositAddress = row.depositAddress
+          .maybeWhere((it) => it.isNotEmpty)
+          ?.let(Ed25519HDPublicKey.fromBase58);
+
       return (
         id: row.id,
         created: row.created,
@@ -121,6 +126,7 @@ class OffRampOrderService implements Disposable {
         resolved: row.resolvedAt,
         receiveAmount: receiveAmount,
         partnerOrderId: row.partnerOrderId,
+        depositAddress: depositAddress,
       );
     });
   }

packages/espressocash_app/lib/features/ramp/src/widgets/off_ramp_confirmation.dart

@@ -65,6 +65,7 @@ class OffRampConfirmation extends StatelessWidget {
                           type: FeeType.withdraw(
                             amount: order.amount.value,
                             partner: order.partner,
+                            address: order.depositAddress,
                           ),
                         ),
                         const SizedBox(height: 21),

packages/espressocash_app/lib/storybook/stories/screens/off_ramp_order_screen.dart

@@ -26,6 +26,7 @@ final offRampOrderScreenStory = Story(
       partner: RampPartner.scalex,
       resolved: null,
       partnerOrderId: 'PARTNER_ORDER_ID',
+      depositAddress: null,
     ),
   ),
 );