Let backend know that the rate app flow was triggered

by setting the feature flag to false.

This is not a guarantee that the rate app dialog was shown,
as the final decision on whether to show the "rate app dialog"
or not is done by google play lib based on "API usage quota"
(the rate dialog can only be shown so many times in a given timeframe).

MAILAND-3071

app/src/main/java/ch/protonmail/android/feature/rating/usecase/StartRateAppFlowIfNeeded.kt

@@ -34,24 +34,32 @@ class StartRateAppFlowIfNeeded @Inject constructor(
 ) {
 
     suspend operator fun invoke(userId: UserId) {
-        if (!showReviewFeatureFlag(userId)) {
+        if (!isShowReviewFeatureFlagEnabled(userId)) {
             return
         }
         if (mailboxScreenViewsRepository.screenViewCount < MailboxScreenViewsThreshold) {
             return
         }
         startRateAppFlow()
+        recordReviewFlowStarted(userId)
     }
 
-    private suspend fun showReviewFeatureFlag(userId: UserId): Boolean {
-        val featureId = MailFeatureFlags.ShowReviewAppDialog.featureId
-        return featureFlagManager.getOrDefault(
-            userId,
-            featureId,
-            FeatureFlag.default(featureId.id, false)
-        ).value
+    private suspend fun recordReviewFlowStarted(userId: UserId) {
+        val featureFlag = getShowReviewFeatureFlag(userId)
+        val offFeatureFlag = featureFlag.copy(defaultValue = false, value = false)
+        featureFlagManager.update(offFeatureFlag)
     }
 
+    private suspend fun isShowReviewFeatureFlagEnabled(userId: UserId) = getShowReviewFeatureFlag(userId).value
+
+    private suspend fun getShowReviewFeatureFlag(
+        userId: UserId
+    ) = featureFlagManager.getOrDefault(
+        userId,
+        MailFeatureFlags.ShowReviewAppDialog.featureId,
+        FeatureFlag.default(MailFeatureFlags.ShowReviewAppDialog.featureId.id, false)
+    )
+
     companion object {
         private const val MailboxScreenViewsThreshold = 2
     }

app/src/test/java/ch/protonmail/android/feature/rating/usecase/StartRateAppFlowIfNeededTest.kt

@@ -25,6 +25,7 @@ import ch.protonmail.android.featureflags.MailFeatureFlags
 import ch.protonmail.android.testdata.UserTestData
 import io.mockk.Called
 import io.mockk.coEvery
+import io.mockk.coVerify
 import io.mockk.every
 import io.mockk.mockk
 import io.mockk.verify
@@ -37,8 +38,10 @@ import org.junit.Test
 
 class StartRateAppFlowIfNeededTest {
 
+    private val userId = UserTestData.userId
+
     private val mailboxScreenViewsRepository: MailboxScreenViewInMemoryRepository = mockk()
-    private val featureFlagManager: FeatureFlagManager = mockk()
+    private val featureFlagManager: FeatureFlagManager = mockk(relaxUnitFun = true)
     private val startRateAppFlow: StartRateAppFlow = mockk(relaxUnitFun = true)
 
     private val startRateAppFlowIfNeeded = StartRateAppFlowIfNeeded(
@@ -50,7 +53,6 @@ class StartRateAppFlowIfNeededTest {
     @Test
     fun `rate app flow is started when feature flag is true and mailbox screen views reached threshold`() = runTest {
         // given
-        val userId = UserTestData.userId
         mockFeatureFlagValue(userId, true)
         mockScreenViews(2)
 
@@ -64,7 +66,6 @@ class StartRateAppFlowIfNeededTest {
     @Test
     fun `rate app flow is not started when feature flag is false`() = runTest {
         // given
-        val userId = UserTestData.userId
         mockFeatureFlagValue(userId, false)
         mockScreenViews(2)
 
@@ -78,7 +79,6 @@ class StartRateAppFlowIfNeededTest {
     @Test
     fun `rate app flow is not started when mailbox screen views are less than threshold`() = runTest {
         // given
-        val userId = UserTestData.userId
         mockFeatureFlagValue(userId, true)
         mockScreenViews(1)
 
@@ -89,6 +89,21 @@ class StartRateAppFlowIfNeededTest {
         verify { startRateAppFlow wasNot Called }
     }
 
+    @Test
+    fun `notify backend that the rate flow was started by disabling feature flag`() = runTest {
+        // given
+        mockFeatureFlagValue(userId, true)
+        mockScreenViews(2)
+
+        // when
+        startRateAppFlowIfNeeded(userId)
+
+        // then
+        val featureId = MailFeatureFlags.ShowReviewAppDialog.featureId
+        val featureFlag = FeatureFlag(userId, featureId, Scope.User, defaultValue = false, value = false)
+        coVerify { featureFlagManager.update(featureFlag) }
+    }
+
     private suspend fun mockFeatureFlagValue(userId: UserId, isEnabled: Boolean) {
         val featureId = MailFeatureFlags.ShowReviewAppDialog.featureId
         coEvery {