feat(opencode): add VerifiedFiatCalculator for supply-consistent exchange

Introduce VerifiedFiatCalculator that computes LocalFiat using the
verified supply from VerifiedProtoManager, ensuring underlyingTokenAmount,
nativeAmount, and fx are all consistent with the VerifiedState sent to
the server.

- Move valueExchangeIn logic from LocalFiat into RealVerifiedFiatCalculator
- Add supplyOverride parameter to Fiat.tokenBalance
- Bind via Hilt in OpenCodeModule
- Remove unused imports from TransactionController

Signed-off-by: Brandon McAnsh <git@bmcreations.dev>

Author: bmc08gt

apps/flipcash/features/cash/src/main/kotlin/com/flipcash/app/cash/internal/CashScreenViewModel.kt

@@ -11,6 +11,7 @@ import com.getcode.manager.BottomBarAction
 import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.opencode.model.financial.Currency
 import com.getcode.opencode.model.financial.CurrencyCode
 import com.getcode.opencode.model.financial.Fiat
@@ -47,6 +48,7 @@ import kotlin.math.min
 internal class CashScreenViewModel @Inject constructor(
     private val resources: ResourceHelper,
     private val exchange: Exchange,
+    private val verifiedFiatCalculator: VerifiedFiatCalculator,
     tokenCoordinator: TokenCoordinator,
     transactionController: TransactionOperations,
     dispatchers: DispatcherProvider,
@@ -140,7 +142,7 @@ internal class CashScreenViewModel @Inject constructor(
                         viewModelScope.launch {
                             val rate = exchange.entryRate
                             val (token, balance) = stateFlow.value.token!!
-                            val amountFiat = LocalFiat.valueExchangeIn(
+                            val amountFiat = verifiedFiatCalculator.compute(
                                 amount =  Fiat(amount, rate.currency),
                                 token = token,
                                 rate = rate,
@@ -302,7 +304,7 @@ internal class CashScreenViewModel @Inject constructor(
                 val (token, balance) = stateFlow.value.token!!
                 val rate = exchange.entryRate
 
-                val amountFiat = LocalFiat.valueExchangeIn(
+                val amountFiat = verifiedFiatCalculator.compute(
                     amount = Fiat(data.amountData.amount, rate.currency),
                     token = token,
                     balance = balance.underlyingTokenAmount,

apps/flipcash/features/cash/src/test/kotlin/com/flipcash/app/cash/internal/CashScreenViewModelTest.kt

@@ -10,6 +10,7 @@ import com.flipcash.libs.coroutines.DispatcherProvider
 import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.opencode.model.financial.Currency
 import com.getcode.opencode.model.financial.CurrencyCode
 import com.getcode.opencode.model.financial.Fiat
@@ -54,6 +55,7 @@ class CashScreenViewModelTest {
 
     private val resources: ResourceHelper = mockk(relaxed = true)
     private val exchange: Exchange = mockk(relaxed = true)
+    private val verifiedFiatCalculator: VerifiedFiatCalculator = mockk(relaxed = true)
     private val tokenCoordinator: TokenCoordinator = mockk(relaxed = true)
     private val transactionController: TransactionOperations = mockk(relaxed = true)
 
@@ -90,6 +92,7 @@ class CashScreenViewModelTest {
         return CashScreenViewModel(
             resources = resources,
             exchange = exchange,
+            verifiedFiatCalculator = verifiedFiatCalculator,
             tokenCoordinator = tokenCoordinator,
             transactionController = transactionController,
             dispatchers = dispatchers,

apps/flipcash/features/withdrawal/src/main/kotlin/com/flipcash/app/withdrawal/WithdrawalViewModel.kt

@@ -17,6 +17,7 @@ import com.getcode.manager.BottomBarAction
 import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.opencode.model.financial.Currency
 import com.getcode.opencode.model.financial.CurrencyCode
 import com.getcode.opencode.model.financial.Fiat
@@ -68,6 +69,7 @@ internal data class DestinationState(
 internal class WithdrawalViewModel @Inject constructor(
     private val resources: ResourceHelper,
     private val exchange: Exchange,
+    private val verifiedFiatCalculator: VerifiedFiatCalculator,
     private val userManager: UserManager,
     transactionController: TransactionOperations,
     clipboardManager: ClipboardManager,
@@ -267,7 +269,7 @@ internal class WithdrawalViewModel @Inject constructor(
                 dispatchEvent(Event.UpdateConfirmingAmountState(loading = true))
                 val rate = exchange.rateForUsd()
                 val token = stateFlow.value.token!!.token
-                val amountFiat = LocalFiat.valueExchangeIn(
+                val amountFiat = verifiedFiatCalculator.compute(
                     amount = Fiat(data.amountData.amount, rate.currency),
                     token = token,
                     balance = stateFlow.value.token!!.balance,
@@ -394,8 +396,8 @@ internal class WithdrawalViewModel @Inject constructor(
                 val sendingVault = owner.withTimelockForToken(token)
 
                 val feeInMint = feeInUsd?.let { fee ->
-                    LocalFiat.valueExchangeIn(
-                        fee,
+                    verifiedFiatCalculator.compute(
+                        amount = fee,
                         token = token,
                         balance = stateFlow.value.token!!.balance,
                         rate = exchange.rateToUsd(CurrencyCode.USD)!!,

apps/flipcash/features/withdrawal/src/test/kotlin/com/flipcash/app/withdrawal/WithdrawalViewModelErrorTest.kt

@@ -9,6 +9,7 @@ import com.flipcash.services.user.UserManager
 import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.util.resources.ResourceHelper
 import com.flipcash.app.core.MainCoroutineRule
 import com.flipcash.app.core.dispatchers.TestDispatchers
@@ -32,6 +33,7 @@ class WithdrawalViewModelErrorTest {
 
     private val resources = mockk<ResourceHelper>(relaxed = true)
     private val exchange = mockk<Exchange>(relaxed = true)
+    private val verifiedFiatCalculator = mockk<VerifiedFiatCalculator>(relaxed = true)
     private val userManager = mockk<UserManager>(relaxed = true)
     private val transactionController = mockk<TransactionOperations>(relaxed = true)
     private val clipboardManager = mockk<ClipboardManager>(relaxed = true)
@@ -58,6 +60,7 @@ class WithdrawalViewModelErrorTest {
         return WithdrawalViewModel(
             resources = resources,
             exchange = exchange,
+            verifiedFiatCalculator = verifiedFiatCalculator,
             userManager = userManager,
             transactionController = transactionController,
             clipboardManager = clipboardManager,

apps/flipcash/shared/tokens/src/main/kotlin/com/flipcash/app/tokens/TokenCoordinator.kt

@@ -15,6 +15,7 @@ import com.flipcash.app.tokens.core.ReservesBalanceProvider
 import com.getcode.opencode.controllers.AccountController
 import com.getcode.opencode.controllers.TokenController
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.opencode.model.ui.WindowedRange
 import com.getcode.opencode.model.accounts.AccountCluster
 import com.getcode.opencode.model.financial.CurrencyCode
@@ -82,6 +83,7 @@ class TokenCoordinator @Inject constructor(
     private val accountController: AccountController,
     private val networkObserver: NetworkConnectivityListener,
     private val exchange: Exchange,
+    private val verifiedFiatCalculator: VerifiedFiatCalculator,
     private val dataSource: TokenDataSource,
 ) : TokenMetadataProvider, SessionListener, DefaultLifecycleObserver, ReservesBalanceProvider {
 
@@ -476,12 +478,11 @@ class TokenCoordinator @Inject constructor(
 
                         state.balances[mint]?.let { balance ->
                             val exchangedValue = runCatching {
-                                LocalFiat.valueExchangeIn(
+                                verifiedFiatCalculator.compute(
                                     amount = balance,
                                     token = updatedToken,
                                     balance = balance,
                                     rate = Rate.oneToOne,
-                                    debug = false,
                                     trace = false,
                                 ).underlyingTokenAmount
                             }.getOrNull()

apps/flipcash/shared/tokens/src/main/kotlin/com/flipcash/app/tokens/ui/SwapViewModel.kt

@@ -15,6 +15,7 @@ import com.flipcash.shared.tokens.R
 import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.opencode.internal.solana.model.SwapId
 import com.getcode.opencode.model.core.errors.SwapError
 import com.getcode.opencode.model.financial.Currency
@@ -67,6 +68,7 @@ data class AmountEntryState(
 class SwapViewModel @Inject constructor(
     userManager: UserManager,
     private val exchange: Exchange,
+    private val verifiedFiatCalculator: VerifiedFiatCalculator,
     transactionController: TransactionOperations,
     resources: ResourceHelper,
     tokenCoordinator: TokenCoordinator,
@@ -475,7 +477,7 @@ class SwapViewModel @Inject constructor(
                     is SwapPurpose.Buy -> {
                         val rate = exchange.entryRate
                         // buy with reserves
-                        val amountFiat = LocalFiat.valueExchangeIn(
+                        val amountFiat = verifiedFiatCalculator.compute(
                             amount = Fiat(data.amountData.amount, rate.currency),
                             token = Token.usdf,
                             balance = stateFlow.value.reservesBalance.convertingToUsdIfNeeded(rate),
@@ -511,7 +513,7 @@ class SwapViewModel @Inject constructor(
                     is SwapPurpose.Sell -> {
                         val rate = exchange.entryRate
                         val tokenWithBalance = stateFlow.value.tokenWithBalance!!
-                        val amountFiat = LocalFiat.valueExchangeIn(
+                        val amountFiat = verifiedFiatCalculator.compute(
                             amount = Fiat(data.amountData.amount, rate.currency),
                             token = tokenWithBalance.token,
                             balance = tokenWithBalance.balance,

apps/flipcash/shared/tokens/src/test/kotlin/com/flipcash/app/tokens/ui/SwapViewModelErrorTest.kt

@@ -9,6 +9,7 @@ import com.flipcash.shared.tokens.R
 import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
+import com.getcode.opencode.exchange.VerifiedFiatCalculator
 import com.getcode.opencode.model.accounts.AccountCluster
 import com.getcode.opencode.model.financial.LocalFiat
 import com.getcode.opencode.model.financial.Token
@@ -47,6 +48,7 @@ class SwapViewModelErrorTest {
 
     private val userManager = mockk<UserManager>(relaxed = true)
     private val exchange = mockk<Exchange>(relaxed = true)
+    private val verifiedFiatCalculator = mockk<VerifiedFiatCalculator>(relaxed = true)
     // Mockito for Result-returning methods (MockK double-boxes Result inline class)
     private val transactionController: TransactionOperations = mock()
     private val resources = mockk<ResourceHelper>(relaxed = true)
@@ -85,6 +87,7 @@ class SwapViewModelErrorTest {
         return SwapViewModel(
             userManager = userManager,
             exchange = exchange,
+            verifiedFiatCalculator = verifiedFiatCalculator,
             transactionController = transactionController,
             resources = resources,
             tokenCoordinator = tokenCoordinator,

services/opencode/build.gradle.kts

@@ -94,4 +94,5 @@ dependencies {
 
     testImplementation(kotlin("test"))
     testImplementation(libs.bundles.unit.testing)
+    testImplementation(testFixtures(project(":libs:currency-math")))
 }

services/opencode/src/main/kotlin/com/getcode/opencode/controllers/TransactionController.kt

@@ -12,7 +12,6 @@ import com.getcode.opencode.internal.solana.model.SwapId
 import com.getcode.opencode.model.accounts.AccountCluster
 import com.getcode.opencode.model.accounts.GiftCardAccount
 import com.getcode.opencode.model.core.errors.GetIntentMetadataError
-import com.getcode.opencode.model.core.errors.GetLimitsError
 import com.getcode.opencode.model.core.errors.SwapError
 import com.getcode.opencode.model.financial.Distribution
 import com.getcode.opencode.model.financial.Fee
@@ -46,13 +45,11 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.catch
-import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.mapNotNull
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.takeWhile
-import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicInteger
 import javax.inject.Inject
 import javax.inject.Singleton

services/opencode/src/main/kotlin/com/getcode/opencode/exchange/VerifiedFiatCalculator.kt

@@ -0,0 +1,17 @@
+package com.getcode.opencode.exchange
+
+import com.getcode.opencode.model.financial.Fiat
+import com.getcode.opencode.model.financial.LocalFiat
+import com.getcode.opencode.model.financial.Rate
+import com.getcode.opencode.model.financial.Token
+import com.getcode.services.opencode.BuildConfig
+
+interface VerifiedFiatCalculator {
+    fun compute(
+        amount: Fiat,
+        token: Token,
+        balance: Fiat? = null,
+        rate: Rate,
+        trace: Boolean = true,
+    ): LocalFiat
+}