[Analytics Hub] Exit Analytics Hub and display an error if date range selection fails

WooCommerce/Classes/ViewRelated/Dashboard/Analytics Hub/AnalyticsHubView.swift

@@ -5,15 +5,39 @@ import SwiftUI
 /// Hosting Controller for the `AnalyticsHubView` view.
 ///
 final class AnalyticsHubHostingViewController: UIHostingController<AnalyticsHubView> {
-    init(siteID: Int64, timeRange: StatsTimeRangeV4) {
+
+    /// Presents an error notice in the tab bar context after this `self` is dismissed.
+    ///
+    private let systemNoticePresenter: NoticePresenter
+
+    /// Defines a notice that should be presented after `self` is dismissed.
+    /// Defaults to `nil`.
+    ///
+    var notice: Notice?
+
+    init(siteID: Int64, timeRange: StatsTimeRangeV4, systemNoticePresenter: NoticePresenter = ServiceLocator.noticePresenter) {
         let viewModel = AnalyticsHubViewModel(siteID: siteID, statsTimeRange: timeRange)
+        self.systemNoticePresenter = systemNoticePresenter
         super.init(rootView: AnalyticsHubView(viewModel: viewModel))
+
+        // Needed to pop the hosting controller from within the SwiftUI view
+        rootView.dismissWithNotice = { [weak self] notice in
+            self?.notice = notice
+            self?.navigationController?.popViewController(animated: true)
+        }
     }
 
     @available(*, unavailable)
     required dynamic init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+
+        // Show any notice that should be presented after the underlying disappears.
+        enqueuePendingNotice(notice, using: systemNoticePresenter)
+    }
 }
 
 /// Main Analytics Hub View
@@ -23,6 +47,11 @@ struct AnalyticsHubView: View {
     /// Environment safe areas
     @Environment(\.safeAreaInsets) var safeAreaInsets: EdgeInsets
 
+    /// Set this closure with UIKit code to pop the view controller and display the provided notice.
+    /// Needed because we need access to the UIHostingController `popViewController` method.
+    ///
+    var dismissWithNotice: ((Notice) -> Void) = { _ in }
+
     @StateObject var viewModel: AnalyticsHubViewModel
 
     var body: some View {
@@ -81,6 +110,10 @@ struct AnalyticsHubView: View {
         .task {
             await viewModel.updateData()
         }
+        .onReceive(viewModel.$dismissNotice) { notice in
+            guard let notice else { return }
+            dismissWithNotice(notice)
+        }
     }
 }
 

WooCommerce/Classes/ViewRelated/Dashboard/Analytics Hub/AnalyticsHubViewModel.swift

@@ -47,6 +47,11 @@ final class AnalyticsHubViewModel: ObservableObject {
     ///
     @Published var timeRangeCard: AnalyticsTimeRangeCardViewModel
 
+    /// Defines a notice that, when set, dismisses the view and is then displayed.
+    /// Defaults to `nil`.
+    ///
+    @Published var dismissNotice: Notice?
+
     // MARK: Private data
 
     /// Order stats for the current selected time period
@@ -67,9 +72,13 @@ final class AnalyticsHubViewModel: ObservableObject {
 
     /// Request stats data from network
     ///
+    @MainActor
     func updateData() async {
         do {
             try await retrieveOrderStats()
+        } catch is AnalyticsHubTimeRangeSelection.TimeRangeGeneratorError {
+            dismissNotice = Notice(title: Localization.timeRangeGeneratorError, feedbackType: .error)
+            DDLogWarn("⚠️ Error selecting analytics time range: \(timeRangeSelectionType.description)")
         } catch {
             switchToErrorState()
             DDLogWarn("⚠️ Error fetching analytics data: \(error)")
@@ -308,5 +317,8 @@ private extension AnalyticsHubViewModel {
                                                  value)
             }
         }
+
+        static let timeRangeGeneratorError = NSLocalizedString("Sorry, something went wrong. We can't load analytics for the selected date range.",
+                                                               comment: "Error shown when there is a problem retrieving the dates for the selected date range.")
     }
 }