[#1121] Available balance check on Send

* [#1121] Available balance check on Send

Closes #1121

* Align UI tests

* Changelog update

CHANGELOG.md

@@ -13,6 +13,7 @@ directly impact users rather than highlighting other key architectural updates.*
 - Home screen navigation switched from the Side menu to the Bottom Navigation Tabs menu
 - Re-enabled the possibility of installing different Zashi application build types on the same device simultaneously 
   (i.e., Mainnet, Testnet, Production, Debug)  
+- Send screen form now validates a maximum amount for sending with respect to the available balance
 
 ## [0.2.0 (505)] - 2023-12-11
 

ui-lib/src/androidTest/java/co/electriccoin/zcash/ui/screen/send/ComposeContentTestRuleExt.kt

@@ -7,6 +7,7 @@ import androidx.compose.ui.test.onNodeWithContentDescription
 import androidx.compose.ui.test.onNodeWithTag
 import androidx.compose.ui.test.onNodeWithText
 import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.performScrollTo
 import androidx.compose.ui.test.performTextClearance
 import androidx.compose.ui.test.performTextInput
 import cash.z.ecc.android.sdk.fixture.WalletAddressFixture
@@ -78,6 +79,7 @@ internal fun ComposeContentTestRule.setMemo(memo: String) {
 
 internal fun ComposeContentTestRule.clickCreateAndSend() {
     onNodeWithTag(SendTag.SEND_FORM_BUTTON).also {
+        it.performScrollTo()
         it.performClick()
     }
 }

ui-lib/src/androidTest/java/co/electriccoin/zcash/ui/screen/send/SendViewTestSetup.kt

@@ -5,6 +5,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.test.junit4.ComposeContentTestRule
+import cash.z.ecc.android.sdk.model.Zatoshi
 import cash.z.ecc.android.sdk.model.ZecSend
 import cash.z.ecc.sdk.fixture.ZatoshiFixture
 import co.electriccoin.zcash.ui.design.theme.ZcashTheme
@@ -95,7 +96,7 @@ class SendViewTestSetup(
 
         ZcashTheme {
             Send(
-                mySpendableBalance = ZatoshiFixture.new(),
+                mySpendableBalance = ZatoshiFixture.new(Zatoshi.MAX_INCLUSIVE),
                 sendStage = sendStage,
                 sendArgumentsWrapper = initialSendArgumentWrapper,
                 onSendStageChange = setSendStage,

ui-lib/src/androidTest/java/co/electriccoin/zcash/ui/screen/send/integration/SendViewIntegrationTest.kt

@@ -6,6 +6,7 @@ import androidx.compose.ui.test.junit4.createComposeRule
 import androidx.compose.ui.test.onNodeWithText
 import androidx.test.filters.MediumTest
 import cash.z.ecc.android.sdk.fixture.WalletFixture
+import cash.z.ecc.android.sdk.model.Zatoshi
 import cash.z.ecc.android.sdk.model.ZcashNetwork
 import cash.z.ecc.sdk.fixture.ZatoshiFixture
 import cash.z.ecc.sdk.fixture.ZecSendFixture
@@ -38,7 +39,7 @@ class SendViewIntegrationTest {
             )
         }
     private val synchronizer = MockSynchronizer.new()
-    private val balance = ZatoshiFixture.new()
+    private val balance = ZatoshiFixture.new(Zatoshi.MAX_INCLUSIVE)
 
     @Test
     @MediumTest

ui-lib/src/androidTest/java/co/electriccoin/zcash/ui/screen/send/view/SendViewTest.kt

@@ -172,8 +172,8 @@ class SendViewTest : UiTestPrerequisites() {
             composeTestRule.setAmount("123")
             composeTestRule.assertSendEnabled()
 
-            // e.g. 123,
-            composeTestRule.setAmount("123${separators.grouping}")
+            // e.g. 123,456
+            composeTestRule.setAmount("123${separators.grouping}456")
             composeTestRule.assertSendEnabled()
 
             // e.g. 123.

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/send/view/SendView.kt

@@ -33,6 +33,7 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
+import cash.z.ecc.android.sdk.ext.ZcashSdk
 import cash.z.ecc.android.sdk.fixture.WalletAddressFixture
 import cash.z.ecc.android.sdk.model.Memo
 import cash.z.ecc.android.sdk.model.MonetarySeparators
@@ -41,6 +42,7 @@ import cash.z.ecc.android.sdk.model.ZecSend
 import cash.z.ecc.android.sdk.model.ZecSendExt
 import cash.z.ecc.android.sdk.model.ZecString
 import cash.z.ecc.android.sdk.model.ZecStringExt
+import cash.z.ecc.android.sdk.model.fromZecString
 import cash.z.ecc.android.sdk.model.toZecString
 import cash.z.ecc.sdk.fixture.MemoFixture
 import cash.z.ecc.sdk.fixture.ZatoshiFixture
@@ -284,7 +286,7 @@ private fun SendMainContent(
 // TODO [#217]: Need to handle changing of Locale after user input, but before submitting the button.
 // TODO [#288]: TextField component can't do long-press backspace.
 // TODO [#294]: DetektAll failed LongMethod
-@Suppress("LongMethod", "LongParameterList")
+@Suppress("LongMethod", "LongParameterList", "CyclomaticComplexMethod")
 @Composable
 private fun SendForm(
     myBalance: Zatoshi,
@@ -416,6 +418,18 @@ private fun SendForm(
 
         Spacer(modifier = Modifier.height(dimens.spacingDefault))
 
+        // Create a send amount that is continuously checked for validity
+        val sendValueCheck = (Zatoshi.fromZecString(context, amountZecString, monetarySeparators))?.value ?: 0L
+
+        // Continuous amount check while user is typing into the amount field
+        // Note: the check for ABBREVIATION_INDEX goes away once proper address validation is in place.
+        // For now, it just prevents a crash on the confirmation screen.
+        val sendButtonEnabled =
+            amountZecString.isNotBlank() &&
+                sendValueCheck > 0L &&
+                myBalance.value >= (sendValueCheck + ZcashSdk.MINERS_FEE.value) &&
+                recipientAddressString.length > ABBREVIATION_INDEX
+
         PrimaryButton(
             onClick = {
                 val zecSendValidation =
@@ -433,9 +447,7 @@ private fun SendForm(
                 }
             },
             text = stringResource(id = R.string.send_create),
-            // Check for ABBREVIATION_INDEX goes away once proper address validation is in place.
-            // For now, it just prevents a crash on the confirmation screen.
-            enabled = amountZecString.isNotBlank() && recipientAddressString.length > ABBREVIATION_INDEX,
+            enabled = sendButtonEnabled,
             outerPaddingValues = PaddingValues(top = dimens.spacingNone),
             modifier = Modifier.testTag(SendTag.SEND_FORM_BUTTON)
         )