Store creation M2 - domain selection: basic UI integration

Experiments/Experiments/DefaultFeatureFlagService.swift

@@ -37,6 +37,8 @@ public struct DefaultFeatureFlagService: FeatureFlagService {
             return buildConfig == .localDeveloper || buildConfig == .alpha
         case .storeCreationMVP:
             return true
+        case .storeCreationM2:
+            return buildConfig == .localDeveloper || buildConfig == .alpha
         case .justInTimeMessagesOnDashboard:
             return true
         case .productsOnboarding:

Experiments/Experiments/FeatureFlag.swift

@@ -78,6 +78,10 @@ public enum FeatureFlag: Int {
     ///
     case storeCreationMVP
 
+    /// Store creation milestone 2. https://wp.me/pe5sF9-I3
+    ///
+    case storeCreationM2
+
     /// Just In Time Messages on Dashboard
     ///
     case justInTimeMessagesOnDashboard

WooCommerce/Classes/Authentication/Store Creation/StoreCreationCoordinator.swift

@@ -1,6 +1,7 @@
 import Combine
 import UIKit
 import Yosemite
+import protocol Experiments.FeatureFlagService
 import protocol Storage.StorageManagerType
 
 /// Coordinates navigation for store creation flow, with the assumption that the app is already authenticated with a WPCOM user.
@@ -22,12 +23,14 @@ final class StoreCreationCoordinator: Coordinator {
     private let source: Source
     private let storePickerViewModel: StorePickerViewModel
     private let switchStoreUseCase: SwitchStoreUseCaseProtocol
+    private let featureFlagService: FeatureFlagService
 
     init(source: Source,
          navigationController: UINavigationController,
          storageManager: StorageManagerType = ServiceLocator.storageManager,
          stores: StoresManager = ServiceLocator.stores,
-         analytics: Analytics = ServiceLocator.analytics) {
+         analytics: Analytics = ServiceLocator.analytics,
+         featureFlagService: FeatureFlagService = ServiceLocator.featureFlagService) {
         self.source = source
         self.navigationController = navigationController
         // Passing the `standard` configuration to include sites without WooCommerce (`isWooCommerceActive = false`).
@@ -37,9 +40,17 @@ final class StoreCreationCoordinator: Coordinator {
                                           analytics: analytics)
         self.switchStoreUseCase = SwitchStoreUseCase(stores: stores, storageManager: storageManager)
         self.analytics = analytics
+        self.featureFlagService = featureFlagService
     }
 
     func start() {
+        featureFlagService.isFeatureFlagEnabled(.storeCreationM2) ?
+        startStoreCreationM2(): startStoreCreationM1()
+    }
+}
+
+private extension StoreCreationCoordinator {
+    func startStoreCreationM1() {
         observeSiteURLsFromStoreCreation()
 
         let viewModel = StoreCreationWebViewModel { [weak self] result in
@@ -52,14 +63,29 @@ final class StoreCreationCoordinator: Coordinator {
         // Disables interactive dismissal of the store creation modal.
         webNavigationController.isModalInPresentation = true
 
+        presentStoreCreation(viewController: webNavigationController)
+    }
+
+    func startStoreCreationM2() {
+        let domainSelector = DomainSelectorHostingController(viewModel: .init(),
+                                                             onDomainSelection: { domain in
+            // TODO-8045: navigate to the next step of store creation.
+        }, onSkip: {
+            // TODO-8045: skip to the next step of store creation with an auto-generated domain.
+        })
+        let storeCreationNavigationController = UINavigationController(rootViewController: domainSelector)
+        presentStoreCreation(viewController: storeCreationNavigationController)
+    }
+
+    func presentStoreCreation(viewController: UIViewController) {
         // If the navigation controller is already presenting another view, the view needs to be dismissed before store
         // creation view can be presented.
         if navigationController.presentedViewController != nil {
             navigationController.dismiss(animated: true) { [weak self] in
-                self?.navigationController.present(webNavigationController, animated: true)
+                self?.navigationController.present(viewController, animated: true)
             }
         } else {
-            navigationController.present(webNavigationController, animated: true)
+            navigationController.present(viewController, animated: true)
         }
     }
 }

WooCommerce/Classes/ViewRelated/Dashboard/Settings/Domains/DomainRowView.swift

@@ -0,0 +1,58 @@
+import SwiftUI
+
+/// View model for a row in a list of domain suggestions.
+struct DomainRowViewModel {
+    /// The domain name is used for the selected state.
+    let name: String
+    /// Attributed name to be displayed in the row.
+    let attributedName: AttributedString
+    /// Whether the domain is selected.
+    let isSelected: Bool
+
+    init(domainName: String, searchQuery: String, isSelected: Bool) {
+        self.name = domainName
+        self.isSelected = isSelected
+        self.attributedName = {
+            var attributedName = AttributedString(domainName)
+            attributedName.font = isSelected ? .body.bold(): .body
+            attributedName.foregroundColor = .init(.label)
+
+            if let rangeOfSearchQuery = attributedName
+                .range(of: searchQuery
+                    // Removes leading/trailing spaces in the search query.
+                    .trimmingCharacters(in: .whitespacesAndNewlines)
+                    // Removes spaces in the search query.
+                    .split(separator: " ").joined()
+                    .lowercased()) {
+                attributedName[rangeOfSearchQuery].font = .body
+                attributedName[rangeOfSearchQuery].foregroundColor = .init(.secondaryLabel)
+            }
+            return attributedName
+        }()
+    }
+}
+
+/// A row that shows an attributed domain name with a checkmark if the domain is selected.
+struct DomainRowView: View {
+    let viewModel: DomainRowViewModel
+
+    var body: some View {
+        HStack {
+            Text(viewModel.attributedName)
+            if viewModel.isSelected {
+                Spacer()
+                Image(uiImage: .checkmarkImage)
+                    .foregroundColor(Color(.brand))
+            }
+        }
+    }
+}
+
+struct DomainRowView_Previews: PreviewProvider {
+    static var previews: some View {
+        VStack(alignment: .leading) {
+            DomainRowView(viewModel: .init(domainName: "whitechristmastrees.mywc.mysite", searchQuery: "White Christmas Trees", isSelected: true))
+            DomainRowView(viewModel: .init(domainName: "whitechristmastrees.mywc.mysite", searchQuery: "White Christmas", isSelected: false))
+        }
+    }
+}

WooCommerce/Classes/ViewRelated/Dashboard/Settings/Domains/DomainSelectorView.swift

@@ -0,0 +1,142 @@
+import SwiftUI
+
+/// Hosting controller that wraps the `DomainSelectorView` view.
+final class DomainSelectorHostingController: UIHostingController<DomainSelectorView> {
+    private let viewModel: DomainSelectorViewModel
+    private let onDomainSelection: (String) -> Void
+    private let onSkip: () -> Void
+
+    /// - Parameters:
+    ///   - viewModel: View model for the domain selector.
+    ///   - onDomainSelection: Called when the user continues with a selected domain name.
+    ///   - onSkip: Called when the user taps to skip domain selection.
+    init(viewModel: DomainSelectorViewModel,
+         onDomainSelection: @escaping (String) -> Void,
+         onSkip: @escaping () -> Void) {
+        self.viewModel = viewModel
+        self.onDomainSelection = onDomainSelection
+        self.onSkip = onSkip
+        super.init(rootView: DomainSelectorView(viewModel: viewModel))
+
+        rootView.onDomainSelection = { [weak self] domain in
+            self?.onDomainSelection(domain)
+        }
+    }
+
+    required dynamic init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        configureSkipButton()
+        configureNavigationBarAppearance()
+    }
+}
+
+private extension DomainSelectorHostingController {
+    func configureSkipButton() {
+        navigationItem.rightBarButtonItem = .init(title: Localization.skipButtonTitle, style: .plain, target: self, action: #selector(skipButtonTapped))
+    }
+
+    /// Shows a transparent navigation bar without a bottom border.
+    func configureNavigationBarAppearance() {
+        let appearance = UINavigationBarAppearance()
+        appearance.configureWithTransparentBackground()
+        appearance.backgroundColor = UIColor.clear
+
+        navigationItem.standardAppearance = appearance
+        navigationItem.scrollEdgeAppearance = appearance
+        navigationItem.compactAppearance = appearance
+    }
+}
+
+private extension DomainSelectorHostingController {
+    @objc func skipButtonTapped() {
+        onSkip()
+    }
+}
+
+private extension DomainSelectorHostingController {
+    enum Localization {
+        static let skipButtonTitle = NSLocalizedString("Skip", comment: "Navigation bar button on the domain selector screen to skip domain selection.")
+    }
+}
+
+/// Allows the user to search for a domain and then select one to continue.
+struct DomainSelectorView: View {
+    /// Set in the hosting controller.
+    var onDomainSelection: ((String) -> Void) = { _ in }
+
+    /// View model to drive the view.
+    @ObservedObject var viewModel: DomainSelectorViewModel
+
+    /// Currently selected domain name.
+    /// If this property is kept in the view model, a SwiftUI error appears `Publishing changes from within view updates`
+    /// when a domain row is selected.
+    @State var selectedDomainName: String?
+
+    var body: some View {
+        ScrollableVStack(alignment: .leading) {
+            // Header labels.
+            VStack(alignment: .leading, spacing: Layout.spacingBetweenTitleAndSubtitle) {
+                Text(Localization.title)
+                    .titleStyle()
+                Text(Localization.subtitle)
+                    .foregroundColor(Color(.secondaryLabel))
+                    .bodyStyle()
+            }
+            .padding(.horizontal, Layout.defaultHorizontalPadding)
+
+            SearchHeader(filterText: $viewModel.searchTerm,
+                         filterPlaceholder: Localization.searchPlaceholder)
+            .padding(.horizontal, Layout.defaultHorizontalPadding)
+
+            Text(Localization.suggestionsHeader)
+                .foregroundColor(Color(.secondaryLabel))
+                .bodyStyle()
+                .padding(.horizontal, Layout.defaultHorizontalPadding)
+
+            List(viewModel.domains, id: \.self) { domain in
+                Button {
+                    selectedDomainName = domain
+                } label: {
+                    DomainRowView(viewModel: .init(domainName: domain,
+                                                   searchQuery: viewModel.searchTerm,
+                                                   isSelected: domain == selectedDomainName))
+                }
+            }.listStyle(.inset)
+
+            if let selectedDomainName {
+                Button(Localization.continueButtonTitle) {
+                    onDomainSelection(selectedDomainName)
+                }
+                .buttonStyle(PrimaryButtonStyle())
+            }
+        }
+    }
+}
+
+private extension DomainSelectorView {
+    enum Layout {
+        static let spacingBetweenTitleAndSubtitle: CGFloat = 16
+        static let defaultHorizontalPadding: CGFloat = 16
+    }
+
+    enum Localization {
+        static let title = NSLocalizedString("Choose a domain", comment: "Title of the domain selector.")
+        static let subtitle = NSLocalizedString(
+            "This is where people will find you on the Internet. Don't worry, you can change it later.",
+            comment: "Subtitle of the domain selector.")
+        static let searchPlaceholder = NSLocalizedString("Type to get suggestions", comment: "Placeholder of the search text field on the domain selector.")
+        static let suggestionsHeader = NSLocalizedString("SUGGESTIONS", comment: "Header label of the domain suggestions on the domain selector.")
+        static let continueButtonTitle = NSLocalizedString("Continue", comment: "Title of the button to continue with a selected domain.")
+    }
+}
+
+struct DomainSelectorView_Previews: PreviewProvider {
+    static var previews: some View {
+        DomainSelectorView(viewModel: .init())
+    }
+}

WooCommerce/Classes/ViewRelated/Dashboard/Settings/Domains/DomainSelectorViewModel.swift

@@ -0,0 +1,78 @@
+import Combine
+import SwiftUI
+import Yosemite
+
+/// View model for `DomainSelectorView`.
+final class DomainSelectorViewModel: ObservableObject {
+    /// Current search term entered by the user.
+    /// Each update will trigger a remote call for domain suggestions.
+    @Published var searchTerm: String = ""
+
+    /// Domain names after domain suggestions are loaded remotely.
+    @Published private(set) var domains: [String] = []
+
+    /// Subscription for search query changes for domain search.
+    private var searchQuerySubscription: AnyCancellable?
+
+    private let stores: StoresManager
+    private let debounceDuration: Double
+
+    init(stores: StoresManager = ServiceLocator.stores,
+         debounceDuration: Double = Constants.fieldDebounceDuration) {
+        self.stores = stores
+        self.debounceDuration = debounceDuration
+        observeDomainQuery()
+    }
+}
+
+private extension DomainSelectorViewModel {
+    func observeDomainQuery() {
+        searchQuerySubscription = $searchTerm
+            .filter { $0.isNotEmpty }
+            .removeDuplicates()
+            .debounce(for: .seconds(debounceDuration), scheduler: DispatchQueue.main)
+            .sink { [weak self] searchTerm in
+                guard let self = self else { return }
+                Task { @MainActor in
+                    let result = await self.loadFreeDomainSuggestions(query: searchTerm)
+                    switch result {
+                    case .success(let suggestions):
+                        self.handleFreeDomainSuggestions(suggestions, query: searchTerm)
+                    case .failure(let error):
+                        self.handleError(error)
+                    }
+                }
+            }
+    }
+
+    @MainActor
+    func loadFreeDomainSuggestions(query: String) async -> Result<[FreeDomainSuggestion], Error> {
+        await withCheckedContinuation { continuation in
+            let action = DomainAction.loadFreeDomainSuggestions(query: searchTerm) { result in
+                continuation.resume(returning: result)
+            }
+            stores.dispatch(action)
+        }
+    }
+
+    @MainActor
+    func handleFreeDomainSuggestions(_ suggestions: [FreeDomainSuggestion], query: String) {
+        domains = suggestions
+            .filter { $0.isFree }
+            .map {
+                $0.name
+            }
+    }
+
+    @MainActor
+    func handleError(_ error: Error) {
+        // TODO-8045: error handling - maybe show an error message.
+        DDLogError("Cannot load domain suggestions for \(searchTerm)")
+    }
+}
+
+private extension DomainSelectorViewModel {
+    enum Constants {
+        static let fieldDebounceDuration = 0.3
+    }
+}

WooCommerce/Classes/Yosemite/AuthenticatedState.swift

@@ -37,6 +37,7 @@ class AuthenticatedState: StoresManagerState {
             CouponStore(dispatcher: dispatcher, storageManager: storageManager, network: network),
             CustomerStore(dispatcher: dispatcher, storageManager: storageManager, network: network),
             DataStore(dispatcher: dispatcher, storageManager: storageManager, network: network),
+            DomainStore(dispatcher: dispatcher, storageManager: storageManager, network: network),
             InAppPurchaseStore(dispatcher: dispatcher, storageManager: storageManager, network: network),
             InboxNotesStore(dispatcher: dispatcher, storageManager: storageManager, network: network),
             JustInTimeMessageStore(dispatcher: dispatcher, storageManager: storageManager, network: network),