From ecbe50a1d0b9cf6f7593a5a8f94d141efe6e0deb Mon Sep 17 00:00:00 2001
From: Matt Czech <matt@livefront.com>
Date: Mon, 5 Aug 2024 10:38:17 -0500
Subject: [PATCH] PM-10517: Add feature flag for intro carousel

---
 .../Core/Platform/Models/Enum/FeatureFlag.swift   |  4 ++++
 BitwardenShared/UI/Auth/AuthRouter.swift          |  1 +
 BitwardenShared/UI/Auth/AuthRouterTests.swift     | 15 +++++++++++++++
 .../UI/Auth/Extensions/AuthRouter+Redirects.swift |  5 +++--
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/BitwardenShared/Core/Platform/Models/Enum/FeatureFlag.swift b/BitwardenShared/Core/Platform/Models/Enum/FeatureFlag.swift
index 7104820415..417347a453 100644
--- a/BitwardenShared/Core/Platform/Models/Enum/FeatureFlag.swift
+++ b/BitwardenShared/Core/Platform/Models/Enum/FeatureFlag.swift
@@ -5,5 +5,9 @@ import Foundation
 /// An enum to represent a feature flag sent by the server
 ///
 enum FeatureFlag: String, Codable {
+    /// A feature flag for the intro carousel flow.
+    case nativeCarouselFlow = "native-carousel-flow"
+
+    /// A feature flag for showing the unassigned items banner.
     case unassignedItemsBanner = "unassigned-items-banner"
 }
diff --git a/BitwardenShared/UI/Auth/AuthRouter.swift b/BitwardenShared/UI/Auth/AuthRouter.swift
index e794ec6c3d..15c5106728 100644
--- a/BitwardenShared/UI/Auth/AuthRouter.swift
+++ b/BitwardenShared/UI/Auth/AuthRouter.swift
@@ -7,6 +7,7 @@ final class AuthRouter: NSObject, Router {
 
     typealias Services = HasAuthRepository
         & HasClientService
+        & HasConfigService
         & HasErrorReporter
         & HasStateService
         & HasVaultTimeoutService
diff --git a/BitwardenShared/UI/Auth/AuthRouterTests.swift b/BitwardenShared/UI/Auth/AuthRouterTests.swift
index b2e32251a7..d32bd85b93 100644
--- a/BitwardenShared/UI/Auth/AuthRouterTests.swift
+++ b/BitwardenShared/UI/Auth/AuthRouterTests.swift
@@ -8,6 +8,7 @@ final class AuthRouterTests: BitwardenTestCase { // swiftlint:disable:this type_
     // MARK: Properties
 
     var authRepository: MockAuthRepository!
+    var configService: MockConfigService!
     var errorReporter: MockErrorReporter!
     var stateService: MockStateService!
     var subject: AuthRouter!
@@ -19,6 +20,7 @@ final class AuthRouterTests: BitwardenTestCase { // swiftlint:disable:this type_
         super.setUp()
 
         authRepository = MockAuthRepository()
+        configService = MockConfigService()
         errorReporter = MockErrorReporter()
         stateService = MockStateService()
         vaultTimeoutService = MockVaultTimeoutService()
@@ -26,6 +28,7 @@ final class AuthRouterTests: BitwardenTestCase { // swiftlint:disable:this type_
         subject = AuthRouter(
             services: ServiceContainer.withMocks(
                 authRepository: authRepository,
+                configService: configService,
                 errorReporter: errorReporter,
                 stateService: stateService,
                 vaultTimeoutService: vaultTimeoutService
@@ -36,6 +39,8 @@ final class AuthRouterTests: BitwardenTestCase { // swiftlint:disable:this type_
     override func tearDown() {
         super.tearDown()
 
+        authRepository = nil
+        configService = nil
         errorReporter = nil
         stateService = nil
         subject = nil
@@ -767,6 +772,16 @@ final class AuthRouterTests: BitwardenTestCase { // swiftlint:disable:this type_
         XCTAssertTrue(authRepository.logoutCalled)
     }
 
+    /// `handleAndRoute(_ :)` redirects `.didStart` to `.introCarousel` if there's no accounts and
+    /// the carousel flow is enabled.
+    func test_handleAndRoute_didStart_createAccountFlow() async {
+        configService.featureFlagsBool[.nativeCarouselFlow] = true
+
+        let route = await subject.handleAndRoute(.didStart)
+
+        XCTAssertEqual(route, .introCarousel)
+    }
+
     /// `handleAndRoute(_ :)` redirects `.didTimeout` to `.complete`
     ///     if the account has never lock enabled.
     func test_handleAndRoute_didTimeout_neverLock() async {
diff --git a/BitwardenShared/UI/Auth/Extensions/AuthRouter+Redirects.swift b/BitwardenShared/UI/Auth/Extensions/AuthRouter+Redirects.swift
index 9d4ef2ee4b..64154f59a4 100644
--- a/BitwardenShared/UI/Auth/Extensions/AuthRouter+Redirects.swift
+++ b/BitwardenShared/UI/Auth/Extensions/AuthRouter+Redirects.swift
@@ -204,8 +204,9 @@ extension AuthRouter {
     ///
     func preparedStartRoute() async -> AuthRoute {
         guard let activeAccount = try? await configureActiveAccount(shouldSwitchAutomatically: true) else {
-            // If no account can be set to active, go to the landing screen.
-            return .landing
+            // If no account can be set to active, go to the landing or carousel screen.
+            let isCarouselEnabled: Bool = await services.configService.getFeatureFlag(.nativeCarouselFlow)
+            return isCarouselEnabled ? .introCarousel : .landing
         }
 
         // Check for a `logout` timeout action.