chore(swap): show specific error when sell amount is too low for fee

When a swap is denied because the amount can't cover the 1% sell fee,
show a targeted "Amount Too Low" alert instead of the generic error.

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

Author: bmc08gt

apps/flipcash/core/src/main/res/values/strings.xml

@@ -423,6 +423,9 @@
     <string name="error_title_buySellFailed">Something Went Wrong</string>
     <string name="error_description_buySellFailed">Please try again</string>
 
+    <string name="error_title_sellFailedDueToBeingTooLow">Amount Too Low</string>
+    <string name="error_description_sellFailedDueToBeingTooLow">The amount you entered is too small to cover the required transaction fee. Please enter a larger amount</string>
+
     <string name="label_fromCurrencyAppreciation">from currency appreciation</string>
     <string name="label_fromCurrencyDepreciation">from currency depreciation</string>
 

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

@@ -16,6 +16,7 @@ import com.getcode.manager.BottomBarManager
 import com.getcode.opencode.controllers.TransactionOperations
 import com.getcode.opencode.exchange.Exchange
 import com.getcode.opencode.internal.solana.model.SwapId
+import com.getcode.opencode.model.core.errors.SwapError
 import com.getcode.opencode.model.financial.Currency
 import com.getcode.opencode.model.financial.CurrencyCode
 import com.getcode.opencode.model.financial.Fiat
@@ -584,9 +585,18 @@ class BuySellSwapTokenViewModel @Inject constructor(
                     dispatchEvent(Event.UpdateSellState(loading = false, success = true))
                     // sell submitted, drop from balance
                     tokenCoordinator.subtract(token, amount)
-                }.onFailure {
-                    trackTransaction(token, error = it)
+                }.onFailure { cause ->
+                    trackTransaction(token, error = cause)
                     dispatchEvent(Event.UpdateSellState(loading = false, success = false))
+                    if (cause is SwapError.Denied) {
+                        if (cause.amountTooLowForFee) {
+                            BottomBarManager.showAlert(
+                                title = resources.getString(R.string.error_title_sellFailedDueToBeingTooLow),
+                                message = resources.getString(R.string.error_description_sellFailedDueToBeingTooLow),
+                            )
+                            return@onFailure
+                        }
+                    }
                     BottomBarManager.showError(
                         title = resources.getString(R.string.error_title_buySellFailed),
                         message = resources.getString(R.string.error_description_buySellFailed),

services/opencode/src/main/kotlin/com/getcode/opencode/model/core/errors/Errors.kt

@@ -215,7 +215,9 @@ sealed class SwapError(
     override val message: String? = null,
     override val cause: Throwable? = null
 ) : CodeServerError(message, cause) {
-    data class Denied(private val reasons: List<String>) : SwapError(message = reasons.joinToString())
+    data class Denied(private val reasons: List<String>) : SwapError(message = reasons.joinToString()) {
+        val amountTooLowForFee = reasons.contains("swap would not generate a sell fee")
+    }
     class Signature : SwapError(), NotifiableError
     class Unrecognized : SwapError("Unrecognized"), NotifiableError
     class InvalidSwap(reasons: List<String>): SwapError(message = reasons.joinToString()), NotifiableError