feat(buy): consolidate amount entry into single screen

Now the Buy button navigates directly to the Swap amount screen. SwapViewModel
checks reserves on confirm: sufficient buys from reserves, insufficient
presents purchase method sheet on the same screen. Shortfall flow skips
TokenInfo and pre-fills the amount with a minimum enforced. Single
available purchase method auto-selects without showing the sheet.

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

Author: bmc08gt

apps/flipcash/core/src/main/kotlin/com/flipcash/app/core/AppRoute.kt

@@ -137,7 +137,7 @@ sealed interface AppRoute : NavKey, Parcelable {
             val shortfall: Fiat? = null,
         ) : Token, FlowRouteWithResult<SwapResult> {
             override val initialStack: List<NavKey>
-                get() = listOf(SwapStep.Entry(purpose))
+                get() = listOf(SwapStep.Entry(purpose, initialAmount = shortfall))
         }
 
         @Serializable

apps/flipcash/core/src/main/kotlin/com/flipcash/app/core/tokens/SwapStep.kt

@@ -5,14 +5,15 @@ import com.getcode.navigation.NonDismissableRoute
 import com.getcode.navigation.NonDraggableRoute
 import com.getcode.navigation.flow.FlowStep
 import com.getcode.opencode.internal.solana.model.SwapId
+import com.getcode.opencode.model.financial.Fiat
 import kotlinx.parcelize.Parcelize
 import kotlinx.serialization.Serializable
 
 @Serializable
 sealed interface SwapStep : FlowStep, Parcelable {
     @Parcelize
     @Serializable
-    data class Entry(val purpose: SwapPurpose) : SwapStep
+    data class Entry(val purpose: SwapPurpose, val initialAmount: Fiat? = null) : SwapStep
 
     @Parcelize
     @Serializable

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

@@ -439,6 +439,7 @@
     <string name="title_amountToBuy">Amount to Buy</string>
     <string name="title_amountToSell">Amount to Sell</string>
     <string name="subtitle_buySellCashHint">Enter up to %1$s</string>
+    <string name="subtitle_buyHintBelowMinimum">You must buy at least %1$s</string>
     <string name="subtitle_buyHintLimitExceeded">You can only buy up to %1$s</string>
     <string name="subtitle_sellHintLimitExceeded">You can only sell up to %1$s</string>
     <string name="action_buy">Buy</string>

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

@@ -3,6 +3,7 @@ package com.flipcash.app.cash.internal
 import androidx.lifecycle.viewModelScope
 import com.flipcash.app.core.AppRoute
 import com.flipcash.app.core.bill.Bill
+import com.flipcash.app.core.tokens.SwapPurpose
 import com.flipcash.app.core.ui.CurrencyHolder
 import com.flipcash.app.tokens.TokenCoordinator
 import com.flipcash.features.cash.R
@@ -338,12 +339,12 @@ internal class CashScreenViewModel @Inject constructor(
             .filterIsInstance<Event.AddCashToWallet>()
             .map { it.amount }
             .onEach { shortfall ->
-                // route to buy the token
-                println("shortfall=$shortfall")
+                // route directly to the swap amount screen, skipping token info
+                val mint = stateFlow.value.selectedTokenAddress!!
                 dispatchEvent(
                     Event.OpenScreen(
-                        AppRoute.Token.Info(
-                            mint = stateFlow.value.selectedTokenAddress!!,
+                        AppRoute.Token.Swap(
+                            purpose = SwapPurpose.Buy(mint),
                             shortfall = shortfall,
                         ),
                     )

apps/flipcash/features/currency-creator/src/main/kotlin/com/flipcash/app/currencycreator/internal/CurrencyCreatorViewModel.kt

@@ -432,7 +432,6 @@ internal class CurrencyCreatorViewModel @Inject constructor(
         eventFlow
             .filterIsInstance<Event.LaunchToken>()
             .map { event ->
-                println("customizations=${stateFlow.value.customizations}")
                 val request = TokenCreateRequest(
                     name = ModerationAttestation.Text(
                         text = stateFlow.value.nameFieldState.text.trim().toString(),

apps/flipcash/features/tokens/build.gradle.kts

@@ -10,6 +10,7 @@ dependencies {
     implementation(libs.bundles.haze)
 
     implementation(project(":apps:flipcash:shared:analytics"))
+    implementation(project(":apps:flipcash:shared:onramp:coinbase"))
     implementation(project(":apps:flipcash:shared:onramp:deeplinks"))
     implementation(project(":apps:flipcash:shared:shareable"))
     implementation(project(":apps:flipcash:shared:tokens"))

apps/flipcash/features/tokens/src/main/kotlin/com/flipcash/app/tokens/SwapEntryContent.kt

@@ -13,12 +13,15 @@ import com.flipcash.app.core.AppRoute
 import com.flipcash.app.core.tokens.SwapPurpose
 import com.flipcash.app.core.tokens.SwapResult
 import com.flipcash.app.core.tokens.SwapStep
+import com.flipcash.app.onramp.LocalCoinbaseOnRampController
 import com.flipcash.app.onramp.LocalExternalWalletOnRampController
 import com.flipcash.app.tokens.internal.SwapEntryScreenContent
 import com.flipcash.app.tokens.ui.SwapViewModel
 import com.flipcash.features.tokens.R
+import com.getcode.navigation.core.LocalCodeNavigator
 import com.getcode.navigation.flow.flowSharedViewModel
 import com.getcode.navigation.flow.rememberFlowNavigator
+import com.getcode.opencode.model.financial.Fiat
 import com.getcode.ui.components.AppBarWithTitle
 import kotlinx.coroutines.flow.filterIsInstance
 import kotlinx.coroutines.flow.launchIn
@@ -28,11 +31,14 @@ import kotlinx.coroutines.flow.onEach
 @Composable
 internal fun SwapEntryContent(
     purpose: SwapPurpose,
+    initialAmount: Fiat? = null,
 ) {
     val flowNavigator = rememberFlowNavigator<SwapStep, SwapResult>()
     val viewModel = flowSharedViewModel<SwapViewModel>()
     val state by viewModel.stateFlow.collectAsStateWithLifecycle()
+    val navigator = LocalCodeNavigator.current
     val externalWalletOnRampController = LocalExternalWalletOnRampController.current
+    val coinbaseOnRampController = LocalCoinbaseOnRampController.current
 
     Column(
         modifier = Modifier.fillMaxSize(),
@@ -60,6 +66,9 @@ internal fun SwapEntryContent(
 
     LaunchedEffect(viewModel) {
         viewModel.dispatchEvent(SwapViewModel.Event.OnPurposeChanged(purpose))
+        if (initialAmount != null) {
+            viewModel.dispatchEvent(SwapViewModel.Event.OnInitialAmountProvided(initialAmount))
+        }
     }
 
     LaunchedEffect(viewModel) {
@@ -106,4 +115,29 @@ internal fun SwapEntryContent(
             }
         }
     }
+
+    LaunchedEffect(viewModel) {
+        viewModel.eventFlow
+            .filterIsInstance<SwapViewModel.Event.OnVerificationNeeded>()
+            .onEach { (phone, email) ->
+                val mint = (viewModel.stateFlow.value.purpose as? SwapPurpose.Buy)?.mint ?: return@onEach
+                navigator.push(
+                    AppRoute.Verification(
+                        origin = AppRoute.Token.OnRamp(mint),
+                        includePhone = phone,
+                        includeEmail = email,
+                    )
+                )
+            }.launchIn(this)
+    }
+
+    LaunchedEffect(Unit) {
+        coinbaseOnRampController.pendingNavigation.collect { route ->
+            if (route is AppRoute.Token.TxProcessing) {
+                flowNavigator.navigateTo(
+                    SwapStep.Processing(route.swapId, route.awaitExternalWallet)
+                )
+            }
+        }
+    }
 }

apps/flipcash/features/tokens/src/main/kotlin/com/flipcash/app/tokens/SwapFlowScreen.kt

@@ -52,7 +52,7 @@ fun SwapFlowScreen(
 
 private fun swapEntryProvider(): (NavKey) -> NavEntry<NavKey> = entryProvider {
     flowAnnotatedEntry<SwapStep.Entry> { step ->
-        SwapEntryContent(step.purpose)
+        SwapEntryContent(step.purpose, step.initialAmount)
     }
     annotatedEntry<SwapStep.SellReceipt> { SellReceiptContent() }
     annotatedEntry<SwapStep.Processing> { step ->

apps/flipcash/features/tokens/src/main/kotlin/com/flipcash/app/tokens/internal/SwapEntryScreenContent.kt

@@ -55,7 +55,12 @@ internal fun SwapEntryScreenContent(
             currencyFlag = entryState.currencyModel.selected?.resId,
             prefix = entryState.currencyModel.selected?.symbol.orEmpty(),
             placeholder = "0",
-            hint = if (state.isError) {
+            hint = if (state.isBelowMinimum) {
+                stringResource(
+                    R.string.subtitle_buyHintBelowMinimum,
+                    state.minimumBuyAmount?.formatted().orEmpty()
+                )
+            } else if (state.isError) {
                 when (state.purpose) {
                     is SwapPurpose.BalanceIncrease -> stringResource(
                         R.string.subtitle_buyHintLimitExceeded,

apps/flipcash/shared/payments/src/main/kotlin/com/flipcash/app/payments/PurchaseMethodController.kt

@@ -7,4 +7,5 @@ interface PurchaseMethodController {
     val state: StateFlow<PurchaseMethodState>
     val selections: Flow<PurchaseMethodSelection>
     fun present(metadata: PurchaseMethodMetadata = PurchaseMethodMetadata())
+    fun select(method: PurchaseMethod, metadata: PurchaseMethodMetadata)
 }