Updated on 2026-08-14

features/swap/presentation/src/main/java/com/tangem/feature/swap/models/UiActions.kt

@@ -4,6 +4,7 @@ import com.tangem.common.ui.bottomsheet.permission.state.ApproveType
 import com.tangem.domain.tokens.model.CryptoCurrency
 import com.tangem.feature.swap.domain.models.SwapAmount
 import com.tangem.feature.swap.domain.models.ui.TxFee
+import java.math.BigDecimal
 
 data class UiActions(
     val onSearchEntered: (String) -> Unit,
@@ -15,8 +16,8 @@ data class UiActions(
     val onChangeCardsClicked: () -> Unit,
     val onBackClicked: () -> Unit,
     val onMaxAmountSelected: () -> Unit,
-    val onReduceAmount: (SwapAmount) -> Unit,
-    val onLeaveExistentialDeposit: (SwapAmount) -> Unit,
+    val onReduceToAmount: (SwapAmount) -> Unit,
+    val onReduceByAmount: (SwapAmount, reduceBy: BigDecimal) -> Unit,
     val openPermissionBottomSheet: () -> Unit,
     val onChangeApproveType: (ApproveType) -> Unit,
     // region new actions

features/swap/presentation/src/main/java/com/tangem/feature/swap/presentation/SwapNotificationsFactory.kt

@@ -134,10 +134,11 @@ internal class SwapNotificationsFactory(
     ) {
         val fromCurrencyStatus = quoteModel.fromTokenInfo.cryptoCurrencyStatus
         val includeFeeInAmount = quoteModel.preparedSwapConfigState.includeFeeInAmount
+        val amount = quoteModel.fromTokenInfo.tokenAmount
         val amountToRequest = if (includeFeeInAmount is IncludeFeeInAmount.Included) {
             includeFeeInAmount.amountSubtractFee
         } else {
-            quoteModel.fromTokenInfo.tokenAmount
+            amount
         }
         val fee = when (val feeState = quoteModel.txFee) {
             TxFeeState.Empty -> null
@@ -154,13 +155,12 @@ internal class SwapNotificationsFactory(
         addExistentialWarningNotification(
             existentialDeposit = quoteModel.currencyCheck?.existentialDeposit,
             feeAmount = fee?.feeValue.orZero(),
-            receivedAmount = amountToRequest.value,
+            sendingAmount = amount.value,
             cryptoCurrencyStatus = fromCurrencyStatus,
-            onReduceClick = { _, reduceByDiff, _ ->
-                actions.onLeaveExistentialDeposit(
-                    amountToRequest.copy(
-                        value = amountToRequest.value.minus(reduceByDiff).minus(fee?.feeValue.orZero()),
-                    ),
+            onReduceClick = { reduceBy, reduceByDiff, _ ->
+                actions.onReduceByAmount(
+                    amount.copy(value = amount.value.minus(reduceByDiff)),
+                    reduceBy,
                 )
             },
         )
@@ -170,7 +170,7 @@ internal class SwapNotificationsFactory(
             cryptoCurrency = fromCurrencyStatus.currency,
             minAdaValue = quoteModel.minAdaValue,
             onReduceClick = { reduceTo, _ ->
-                actions.onLeaveExistentialDeposit(amountToRequest.copy(value = reduceTo))
+                actions.onReduceToAmount(amount.copy(value = reduceTo))
             },
         )
         if (!isCardano) {
@@ -191,13 +191,13 @@ internal class SwapNotificationsFactory(
         addReduceAmountNotification(
             cryptoCurrencyStatus = fromCurrencyStatus,
             fromAmount = quoteModel.fromTokenInfo.tokenAmount,
-            onReduceAmount = actions.onReduceAmount,
+            onReduceByAmount = actions.onReduceByAmount,
         )
         addTransactionLimitErrorNotification(
             utxoLimit = quoteModel.currencyCheck?.utxoAmountLimit,
             cryptoCurrency = fromCurrencyStatus.currency,
             onReduceClick = { reduceTo, _ ->
-                actions.onReduceAmount(amountToRequest.copy(value = reduceTo))
+                actions.onReduceToAmount(amountToRequest.copy(value = reduceTo))
             },
         )
     }
@@ -294,7 +294,7 @@ internal class SwapNotificationsFactory(
     private fun MutableList<NotificationUM>.addReduceAmountNotification(
         cryptoCurrencyStatus: CryptoCurrencyStatus,
         fromAmount: SwapAmount,
-        onReduceAmount: (SwapAmount) -> Unit,
+        onReduceByAmount: (SwapAmount, BigDecimal) -> Unit,
     ) {
         val isTezos = isTezos(cryptoCurrencyStatus.currency.network.id.value)
         val balance = cryptoCurrencyStatus.value.amount ?: BigDecimal.ZERO
@@ -309,7 +309,7 @@ internal class SwapNotificationsFactory(
                         val patchedAmount = fromAmount.copy(
                             value = fromAmount.value - threshold,
                         )
-                        onReduceAmount(patchedAmount)
+                        onReduceByAmount(patchedAmount, threshold)
                     },
                 ),
             )

features/swap/presentation/src/main/java/com/tangem/feature/swap/viewmodels/SwapProcessDataState.kt

@@ -7,6 +7,7 @@ import com.tangem.feature.swap.domain.models.ui.RequestApproveStateData
 import com.tangem.feature.swap.domain.models.ui.SwapState
 import com.tangem.feature.swap.domain.models.ui.TokensDataStateExpress
 import com.tangem.feature.swap.domain.models.ui.TxFee
+import java.math.BigDecimal
 
 data class SwapProcessDataState(
     // Initial network id
@@ -15,6 +16,7 @@ data class SwapProcessDataState(
     val feePaidCryptoCurrency: CryptoCurrencyStatus? = null,
     // Amount from input
     val amount: String? = null,
+    val reduceBalanceBy: BigDecimal = BigDecimal.ZERO,
     val approveDataModel: RequestApproveStateData? = null,
     val swapDataModel: SwapDataModel? = null,
     val selectedFee: TxFee? = null,

features/swap/presentation/src/main/java/com/tangem/feature/swap/viewmodels/SwapViewModel.kt

@@ -25,11 +25,7 @@ import com.tangem.domain.feedback.SaveBlockchainErrorUseCase
 import com.tangem.domain.feedback.SendFeedbackEmailUseCase
 import com.tangem.domain.feedback.models.BlockchainErrorInfo
 import com.tangem.domain.feedback.models.FeedbackEmailType
-import com.tangem.domain.tokens.GetCryptoCurrencyStatusSyncUseCase
-import com.tangem.domain.tokens.GetCurrencyStatusUpdatesUseCase
-import com.tangem.domain.tokens.GetMinimumTransactionAmountSyncUseCase
-import com.tangem.domain.tokens.GetFeePaidCryptoCurrencyStatusSyncUseCase
-import com.tangem.domain.tokens.UpdateDelayedNetworkStatusUseCase
+import com.tangem.domain.tokens.*
 import com.tangem.domain.tokens.model.CryptoCurrency
 import com.tangem.domain.tokens.model.CryptoCurrencyStatus
 import com.tangem.domain.tokens.model.Network
@@ -144,6 +140,7 @@ internal class SwapViewModel @Inject constructor(
     // shows currency order (direct - swap initial to selected, reversed = selected to initial)
     private var isOrderReversed = false
     private val lastAmount = mutableStateOf(INITIAL_AMOUNT)
+    private val lastReducedBalanceBy = mutableStateOf(BigDecimal.ZERO)
     private var swapRouter: SwapRouter by Delegates.notNull()
 
     private val isUserResolvableError: (SwapState) -> Boolean = {
@@ -304,6 +301,7 @@ internal class SwapViewModel @Inject constructor(
             fromToken = fromCurrencyStatus,
             toToken = toCurrencyStatus,
             amount = lastAmount.value,
+            reduceBalanceBy = lastReducedBalanceBy.value,
             toProvidersList = findSwapProviders(fromCurrencyStatus, toCurrencyStatus),
         )
     }
@@ -321,6 +319,7 @@ internal class SwapViewModel @Inject constructor(
         fromToken: CryptoCurrencyStatus,
         toToken: CryptoCurrencyStatus,
         amount: String,
+        reduceBalanceBy: BigDecimal,
         toProvidersList: List<SwapProvider>,
         isSilent: Boolean = false,
     ) {
@@ -339,6 +338,7 @@ internal class SwapViewModel @Inject constructor(
                 fromToken = fromToken,
                 toToken = toToken,
                 amount = amount,
+                reduceBalanceBy = reduceBalanceBy,
                 toProvidersList = toProvidersList,
             ),
         )
@@ -354,6 +354,7 @@ internal class SwapViewModel @Inject constructor(
                 toToken = toCurrency,
                 amount = amount,
                 isSilent = isSilent,
+                reduceBalanceBy = dataState.reduceBalanceBy,
                 toProvidersList = findSwapProviders(fromCurrency, toCurrency),
             )
         }
@@ -363,6 +364,7 @@ internal class SwapViewModel @Inject constructor(
         fromToken: CryptoCurrencyStatus,
         toToken: CryptoCurrencyStatus,
         amount: String,
+        reduceBalanceBy: BigDecimal,
         toProvidersList: List<SwapProvider>,
     ): PeriodicTask<Map<SwapProvider, SwapState>> {
         return PeriodicTask(
@@ -372,6 +374,7 @@ internal class SwapViewModel @Inject constructor(
                 runCatching(dispatchers.io) {
                     dataState = dataState.copy(
                         amount = amount,
+                        reduceBalanceBy = reduceBalanceBy,
                         swapDataModel = null,
                         approveDataModel = null,
                     )
@@ -380,6 +383,7 @@ internal class SwapViewModel @Inject constructor(
                         toToken = toToken,
                         providers = toProvidersList,
                         amountToSwap = amount,
+                        reduceBalanceBy = reduceBalanceBy,
                         selectedFee = dataState.selectedFee?.feeType ?: FeeType.NORMAL,
                     )
                 }
@@ -817,6 +821,7 @@ internal class SwapViewModel @Inject constructor(
                 fromToken = fromToken,
                 toToken = toToken,
                 amount = lastAmount.value,
+                reduceBalanceBy = lastReducedBalanceBy.value,
                 toProvidersList = findSwapProviders(fromToken, toToken),
             )
             swapRouter.openScreen(SwapNavScreen.Main)
@@ -886,6 +891,7 @@ internal class SwapViewModel @Inject constructor(
                 ).getOrNull()
                 val decimals = newFromToken.currency.decimals
                 lastAmount.value = cutAmountWithDecimals(decimals, lastAmount.value)
+                lastReducedBalanceBy.value = BigDecimal.ZERO
                 uiState = stateBuilder.updateSwapAmount(
                     uiState = uiState,
                     amountFormatted = inputNumberFormatter.formatWithThousands(lastAmount.value, decimals),
@@ -897,13 +903,18 @@ internal class SwapViewModel @Inject constructor(
                     fromToken = newFromToken,
                     toToken = newToToken,
                     amount = lastAmount.value,
+                    reduceBalanceBy = lastReducedBalanceBy.value,
                     toProvidersList = findSwapProviders(newFromToken, newToToken),
                 )
             }
         }
     }
 
-    private fun onAmountChanged(value: String) {
+    private fun onAmountChanged(
+        value: String,
+        forceQuotesUpdate: Boolean = false,
+        reduceBalanceBy: BigDecimal = BigDecimal.ZERO,
+    ) {
         viewModelScope.launch {
             val fromToken = dataState.fromCryptoCurrency
             val toToken = dataState.toCryptoCurrency
@@ -915,6 +926,7 @@ internal class SwapViewModel @Inject constructor(
                     fromToken,
                 ).getOrNull()
                 lastAmount.value = cutValue
+                lastReducedBalanceBy.value = reduceBalanceBy
                 uiState = stateBuilder.updateSwapAmount(
                     uiState = uiState,
                     amountFormatted = inputNumberFormatter.formatWithThousands(cutValue, decimals),
@@ -928,11 +940,12 @@ internal class SwapViewModel @Inject constructor(
                         isAmountChangedByUser = true
                     }
 
-                    amountDebouncer.debounce(viewModelScope, DEBOUNCE_AMOUNT_DELAY) {
+                    amountDebouncer.debounce(viewModelScope, DEBOUNCE_AMOUNT_DELAY, forceUpdate = forceQuotesUpdate) {
                         startLoadingQuotes(
                             fromToken = fromToken,
                             toToken = toToken,
                             amount = lastAmount.value,
+                            reduceBalanceBy = lastReducedBalanceBy.value,
                             toProvidersList = findSwapProviders(fromToken, toToken),
                         )
                     }
@@ -948,12 +961,12 @@ internal class SwapViewModel @Inject constructor(
         }
     }
 
-    private fun onReduceAmountClicked(newAmount: SwapAmount) {
-        onAmountChanged(newAmount.formatToUIRepresentation())
-    }
-
-    private fun onLeaveExistentialDepositClicked(newAmount: SwapAmount) {
-        onAmountChanged(newAmount.formatToUIRepresentation())
+    private fun onReduceAmountClicked(newAmount: SwapAmount, reduceBalanceBy: BigDecimal = BigDecimal.ZERO) {
+        onAmountChanged(
+            value = newAmount.formatToUIRepresentation(),
+            forceQuotesUpdate = true,
+            reduceBalanceBy = reduceBalanceBy,
+        )
     }
 
     private fun onAmountSelected(selected: Boolean) {
@@ -1014,8 +1027,8 @@ internal class SwapViewModel @Inject constructor(
                 onSearchEntered("")
             },
             onMaxAmountSelected = ::onMaxAmountClicked,
-            onReduceAmount = ::onReduceAmountClicked,
-            onLeaveExistentialDeposit = ::onLeaveExistentialDepositClicked,
+            onReduceToAmount = ::onReduceAmountClicked,
+            onReduceByAmount = ::onReduceAmountClicked,
             openPermissionBottomSheet = {
                 singleTaskScheduler.cancelTask()
                 analyticsEventHandler.send(SwapEvents.ButtonGivePermissionClicked)
@@ -1054,6 +1067,7 @@ internal class SwapViewModel @Inject constructor(
                         selectedFee = it.feeType,
                         fromToken = fromToken,
                         amountToSwap = amountToSwap,
+                        reduceBalanceBy = dataState.reduceBalanceBy,
                     )
                     setupLoadedState(selectedProvider, updatedState, fromToken)
                 }