Store creation M2 - domain selection: empty/error/loading states, design updates

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

@@ -74,6 +74,7 @@ private extension StoreCreationCoordinator {
             // TODO-8045: skip to the next step of store creation with an auto-generated domain.
         })
         let storeCreationNavigationController = UINavigationController(rootViewController: domainSelector)
+        storeCreationNavigationController.navigationBar.prefersLargeTitles = true
         presentStoreCreation(viewController: storeCreationNavigationController)
     }
 

WooCommerce/Classes/Extensions/UIImage+Woo.swift

@@ -226,6 +226,12 @@ extension UIImage {
         return UIImage.gridicon(.cross, size: CGSize(width: 22, height: 22))
     }
 
+    /// Domain search placeholder image.
+    ///
+    static var domainSearchPlaceholderImage: UIImage {
+        return UIImage(named: "domain-search-placeholder")!
+    }
+
     /// Ellipsis Icon
     ///
     static var ellipsisImage: UIImage {

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

@@ -45,6 +45,13 @@ struct DomainRowView: View {
                     .foregroundColor(Color(.brand))
             }
         }
+        .padding(Layout.insets)
+    }
+}
+
+private extension DomainRowView {
+    enum Layout {
+        static let insets: EdgeInsets = .init(top: 10, leading: 16, bottom: 10, trailing: 16)
     }
 }
 

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

@@ -42,9 +42,11 @@ private extension DomainSelectorHostingController {
 
     /// Shows a transparent navigation bar without a bottom border.
     func configureNavigationBarAppearance() {
+        navigationItem.title = Localization.title
+
         let appearance = UINavigationBarAppearance()
         appearance.configureWithTransparentBackground()
-        appearance.backgroundColor = UIColor.clear
+        appearance.backgroundColor = .systemBackground
 
         navigationItem.standardAppearance = appearance
         navigationItem.scrollEdgeAppearance = appearance
@@ -60,6 +62,7 @@ private extension DomainSelectorHostingController {
 
 private extension DomainSelectorHostingController {
     enum Localization {
+        static let title = NSLocalizedString("Choose a domain", comment: "Title of the domain selector.")
         static let skipButtonTitle = NSLocalizedString("Skip", comment: "Navigation bar button on the domain selector screen to skip domain selection.")
     }
 }
@@ -70,49 +73,98 @@ struct DomainSelectorView: View {
     var onDomainSelection: ((String) -> Void) = { _ in }
 
     /// View model to drive the view.
-    @ObservedObject var viewModel: DomainSelectorViewModel
+    @ObservedObject private 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?
+    @State private var selectedDomainName: String?
+
+    init(viewModel: DomainSelectorViewModel) {
+        self.viewModel = viewModel
+    }
 
     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))
+        VStack(alignment: .leading, spacing: 0) {
+            ScrollView {
+                VStack(alignment: .leading) {
+                    // Header label.
+                    Text(Localization.subtitle)
+                        .foregroundColor(Color(.secondaryLabel))
+                        .bodyStyle()
+                        .padding(.horizontal, Layout.defaultHorizontalPadding)
+
+                    // Search text field.
+                    SearchHeader(text: $viewModel.searchTerm,
+                                 placeholder: Localization.searchPlaceholder,
+                                 customizations: .init(backgroundColor: .clear,
+                                                       borderColor: .separator,
+                                                       internalHorizontalPadding: 21,
+                                                       internalVerticalPadding: 12))
+
+                    // Results header.
+                    Text(Localization.suggestionsHeader)
+                        .foregroundColor(Color(.secondaryLabel))
+                        .bodyStyle()
+                        .padding(.horizontal, Layout.defaultHorizontalPadding)
+
+                    // Domain results.
+                    if let placeholderImage = viewModel.placeholderImage {
+                        // Placeholder image when search query is empty.
+                        HStack {
+                            Spacer()
+                            Image(uiImage: placeholderImage)
+                            Spacer()
+                        }
+                    } else if viewModel.isLoadingDomainSuggestions {
+                        // Progress indicator when loading domain suggestions.
+                        HStack {
+                            Spacer()
+                            ProgressView()
+                            Spacer()
+                        }
+                    } else if let errorMessage = viewModel.errorMessage {
+                        // Error message when there is an error loading domain suggestions.
+                        Text(errorMessage)
+                            .padding(Layout.defaultPadding)
+                    } else {
+                        // Domain suggestions.
+                        LazyVStack {
+                            ForEach(viewModel.domains, id: \.self) { domain in
+                                Button {
+                                    selectedDomainName = domain
+                                } label: {
+                                    VStack(alignment: .leading) {
+                                        DomainRowView(viewModel: .init(domainName: domain,
+                                                                       searchQuery: viewModel.searchTerm,
+                                                                       isSelected: domain == selectedDomainName))
+                                        Divider()
+                                            .frame(height: Layout.dividerHeight)
+                                            .padding(.leading, Layout.defaultHorizontalPadding)
+                                    }
+                                }
+                            }
+                        }
+                    }
                 }
-            }.listStyle(.inset)
+            }
 
+            // Continue button when a domain is selected.
             if let selectedDomainName {
+                Divider()
+                    .frame(height: Layout.dividerHeight)
+                    .foregroundColor(Color(.separator))
                 Button(Localization.continueButtonTitle) {
                     onDomainSelection(selectedDomainName)
                 }
                 .buttonStyle(PrimaryButtonStyle())
+                .padding(Layout.defaultPadding)
+            }
+        }
+        .onChange(of: viewModel.isLoadingDomainSuggestions) { isLoadingDomainSuggestions in
+            // Resets selected domain when loading domain suggestions.
+            if isLoadingDomainSuggestions {
+                selectedDomainName = nil
             }
         }
     }
@@ -122,10 +174,11 @@ private extension DomainSelectorView {
     enum Layout {
         static let spacingBetweenTitleAndSubtitle: CGFloat = 16
         static let defaultHorizontalPadding: CGFloat = 16
+        static let dividerHeight: CGFloat = 1
+        static let defaultPadding: EdgeInsets = .init(top: 10, leading: 16, bottom: 10, trailing: 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.")
@@ -135,8 +188,62 @@ private extension DomainSelectorView {
     }
 }
 
+#if DEBUG
+
+import Yosemite
+import enum Networking.DotcomError
+
+/// StoresManager that specifically handles `DomainAction` for `DomainSelectorView` previews.
+final class DomainSelectorViewStores: DefaultStoresManager {
+    private let result: Result<[FreeDomainSuggestion], Error>?
+
+    init(result: Result<[FreeDomainSuggestion], Error>?) {
+        self.result = result
+        super.init(sessionManager: ServiceLocator.stores.sessionManager)
+    }
+
+    override func dispatch(_ action: Action) {
+        if let action = action as? DomainAction {
+            if case let .loadFreeDomainSuggestions(_, completion) = action {
+                if let result {
+                    completion(result)
+                }
+            }
+        }
+    }
+}
+
 struct DomainSelectorView_Previews: PreviewProvider {
     static var previews: some View {
-        DomainSelectorView(viewModel: .init())
+        Group {
+            // Empty query state.
+            DomainSelectorView(viewModel:
+                    .init(initialSearchTerm: "",
+                          stores: DomainSelectorViewStores(result: nil)))
+            // Results state.
+            DomainSelectorView(viewModel:
+                    .init(initialSearchTerm: "Fruit smoothie",
+                          stores: DomainSelectorViewStores(result: .success([
+                            .init(name: "grapefruitsmoothie.com", isFree: true),
+                            .init(name: "fruitsmoothie.com", isFree: true),
+                            .init(name: "grapefruitsmoothiee.com", isFree: true),
+                            .init(name: "freesmoothieeee.com", isFree: true),
+                            .init(name: "greatfruitsmoothie1.com", isFree: true),
+                            .init(name: "tropicalsmoothie.com", isFree: true)
+                          ]))))
+            // Error state.
+            DomainSelectorView(viewModel:
+                    .init(initialSearchTerm: "test",
+                          stores: DomainSelectorViewStores(result: .failure(
+                            DotcomError.unknown(code: "invalid_query",
+                                                message: "Domain searches must contain a word with the following characters.")
+                          ))))
+            // Loading state.
+            DomainSelectorView(viewModel:
+                    .init(initialSearchTerm: "test",
+                          stores: DomainSelectorViewStores(result: nil)))
+        }
     }
 }
+
+#endif

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

@@ -1,6 +1,7 @@
 import Combine
 import SwiftUI
 import Yosemite
+import enum Networking.DotcomError
 
 /// View model for `DomainSelectorView`.
 final class DomainSelectorViewModel: ObservableObject {
@@ -11,30 +12,55 @@ final class DomainSelectorViewModel: ObservableObject {
     /// Domain names after domain suggestions are loaded remotely.
     @Published private(set) var domains: [String] = []
 
+    /// Error message from loading domain suggestions.
+    @Published private(set) var errorMessage: String?
+
+    /// Whether domain suggestions are being loaded.
+    @Published private(set) var isLoadingDomainSuggestions: Bool = false
+
+    /// Placeholder image is set when the search term is empty. Otherwise, the placeholder image is `nil`.
+    @Published private(set) var placeholderImage: UIImage?
+
     /// 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,
+    init(initialSearchTerm: String = "",
+         stores: StoresManager = ServiceLocator.stores,
          debounceDuration: Double = Constants.fieldDebounceDuration) {
         self.stores = stores
         self.debounceDuration = debounceDuration
+
+        // Sets the initial search term after related subscriptions are set up
+        // so that the initial value is always emitted.
+        // In `observeDomainQuery`, `share()` transforms the publisher to `PassthroughSubject`
+        // and thus the initial value isn't emitted in `observeDomainQuery` until setting the value afterward.
         observeDomainQuery()
+        self.searchTerm = initialSearchTerm
     }
 }
 
 private extension DomainSelectorViewModel {
     func observeDomainQuery() {
-        searchQuerySubscription = $searchTerm
+        let searchTermPublisher = $searchTerm
+            .map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
+            .debounce(for: .seconds(debounceDuration), scheduler: DispatchQueue.main)
+            .share()
+
+        searchQuerySubscription = searchTermPublisher
             .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
+                    self.errorMessage = nil
+                    self.placeholderImage = nil
+                    self.isLoadingDomainSuggestions = true
                     let result = await self.loadFreeDomainSuggestions(query: searchTerm)
+                    self.isLoadingDomainSuggestions = false
+
                     switch result {
                     case .success(let suggestions):
                         self.handleFreeDomainSuggestions(suggestions, query: searchTerm)
@@ -43,6 +69,12 @@ private extension DomainSelectorViewModel {
                     }
                 }
             }
+
+        searchTermPublisher
+            .map {
+                $0.isEmpty ? UIImage.domainSearchPlaceholderImage: nil
+            }
+            .assign(to: &$placeholderImage)
     }
 
     @MainActor
@@ -66,8 +98,13 @@ private extension DomainSelectorViewModel {
 
     @MainActor
     func handleError(_ error: Error) {
-        // TODO-8045: error handling - maybe show an error message.
-        DDLogError("Cannot load domain suggestions for \(searchTerm)")
+        if let dotcomError = error as? DotcomError,
+            case let .unknown(_, message) = dotcomError {
+            errorMessage = message
+        } else {
+            errorMessage = Localization.defaultErrorMessage
+        }
+        DDLogError("Cannot load domain suggestions for \(searchTerm): \(error)")
     }
 }
 
@@ -76,3 +113,11 @@ private extension DomainSelectorViewModel {
         static let fieldDebounceDuration = 0.3
     }
 }
+
+extension DomainSelectorViewModel {
+    enum Localization {
+        static let defaultErrorMessage =
+        NSLocalizedString("Please try another query.",
+                          comment: "Default message when there is an unexpected error loading domain suggestions on the domain selector.")
+    }
+}

WooCommerce/Classes/ViewRelated/Orders/Order Details/Address Edit/FilterListSelector.swift

@@ -48,7 +48,7 @@ struct FilterListSelector<ViewModel: FilterListSelectorViewModelable>: View {
 
     var body: some View {
         VStack(spacing: 0) {
-            SearchHeader(filterText: $searchTerm, filterPlaceholder: viewModel.filterPlaceholder)
+            SearchHeader(text: $searchTerm, placeholder: viewModel.filterPlaceholder)
                 .background(Color(.listForeground))
                 .onChange(of: searchTerm) { newValue in
                     viewModel.searchTerm = newValue

WooCommerce/Classes/ViewRelated/Products/ProductSelector/ProductSelector.swift

@@ -42,7 +42,7 @@ struct ProductSelector: View {
     var body: some View {
         NavigationView {
             VStack(spacing: 0) {
-                SearchHeader(filterText: $viewModel.searchTerm, filterPlaceholder: Localization.searchPlaceholder)
+                SearchHeader(text: $viewModel.searchTerm, placeholder: Localization.searchPlaceholder)
                     .padding(.horizontal, insets: safeAreaInsets)
                     .accessibilityIdentifier("product-selector-search-bar")
                 HStack {