Bookings: Add basic logic for booking list

WooCommerce/Classes/Bookings/BookingList/BookingListView.swift

@@ -0,0 +1,14 @@
+import SwiftUI
+
+struct BookingListView: View {
+    // periphery:ignore
+    @ObservedObject private var viewModel: BookingListViewModel
+
+    init(viewModel: BookingListViewModel) {
+        self.viewModel = viewModel
+    }
+
+    var body: some View {
+        Text("Hello, World!")
+    }
+}

WooCommerce/Classes/Bookings/BookingList/BookingListViewModel.swift

@@ -0,0 +1,138 @@
+// periphery:ignore:all
+import Foundation
+import Yosemite
+import protocol Storage.StorageManagerType
+
+/// View model for `BookingListView`
+final class BookingListViewModel: ObservableObject {
+
+    @Published private(set) var bookings: [Booking] = []
+
+    private let siteID: Int64
+    private let stores: StoresManager
+    private let storage: StorageManagerType
+
+    /// Keeps track of the current state of the syncing
+    @Published private(set) var syncState: SyncState = .empty
+
+    /// Tracks if the infinite scroll indicator should be displayed.
+    @Published private(set) var shouldShowBottomActivityIndicator = false
+
+    /// Supports infinite scroll.
+    private let paginationTracker: PaginationTracker
+    private let pageFirstIndex: Int = PaginationTracker.Defaults.pageFirstIndex
+
+    /// Booking ResultsController.
+    private lazy var resultsController: ResultsController<StorageBooking> = {
+        let predicate = NSPredicate(format: "siteID == %lld", siteID)
+        let sortDescriptorByDate = NSSortDescriptor(key: "dateCreated", ascending: false)
+        let resultsController = ResultsController<StorageBooking>(storageManager: storage,
+                                                                  matching: predicate,
+                                                                  sortedBy: [sortDescriptorByDate])
+        return resultsController
+    }()
+
+    init(siteID: Int64,
+         stores: StoresManager = ServiceLocator.stores,
+         storage: StorageManagerType = ServiceLocator.storageManager) {
+        self.siteID = siteID
+        self.stores = stores
+        self.storage = storage
+        self.paginationTracker = PaginationTracker(pageFirstIndex: pageFirstIndex)
+
+        configureResultsController()
+        configurePaginationTracker()
+    }
+
+    /// Called when loading the first page of bookings.
+    func loadBookings() {
+        paginationTracker.syncFirstPage()
+    }
+
+    /// Called when the next page should be loaded.
+    func onLoadNextPageAction() {
+        paginationTracker.ensureNextPageIsSynced()
+    }
+
+    /// Called when the user pulls down the list to refresh.
+    /// - Parameter completion: called when the refresh completes.
+    func onRefreshAction(completion: @escaping () -> Void) {
+        paginationTracker.resync(reason: nil) {
+            completion()
+        }
+    }
+}
+
+// MARK: Configuration
+
+private extension BookingListViewModel {
+    func configurePaginationTracker() {
+        paginationTracker.delegate = self
+    }
+
+    /// Performs initial fetch from storage and updates results.
+    func configureResultsController() {
+        resultsController.onDidChangeContent = { [weak self] in
+            self?.updateResults()
+        }
+        resultsController.onDidResetContent = { [weak self] in
+            self?.updateResults()
+        }
+        do {
+            try resultsController.performFetch()
+            updateResults()
+        } catch {
+            ServiceLocator.crashLogging.logError(error)
+        }
+    }
+
+    /// Updates row view models and sync state.
+    func updateResults() {
+        bookings = resultsController.fetchedObjects
+        transitionToResultsUpdatedState()
+    }
+}
+
+extension BookingListViewModel: PaginationTrackerDelegate {
+    func sync(pageNumber: Int, pageSize: Int, reason: String?, onCompletion: SyncCompletion?) {
+        transitionToSyncingState()
+        let action = BookingAction.synchronizeBookings(siteID: siteID, pageNumber: pageNumber, pageSize: pageSize) { [weak self] result in
+            switch result {
+            case .success(let hasNextPage):
+                onCompletion?(.success(hasNextPage))
+
+            case .failure(let error):
+                DDLogError("⛔️ Error synchronizing bookings: \(error)")
+                onCompletion?(.failure(error))
+            }
+
+            self?.updateResults()
+        }
+        stores.dispatch(action)
+    }
+}
+
+// MARK: State Machine
+
+extension BookingListViewModel {
+    /// Represents possible states for syncing bookings.
+    enum SyncState: Equatable {
+        case syncingFirstPage
+        case results
+        case empty
+    }
+
+    /// Update states for sync from remote.
+    func transitionToSyncingState() {
+        shouldShowBottomActivityIndicator = true
+        if bookings.isEmpty {
+            syncState = .syncingFirstPage
+        }
+    }
+
+    /// Update states after sync is complete.
+    func transitionToResultsUpdatedState() {
+        shouldShowBottomActivityIndicator = false
+        syncState = bookings.isNotEmpty ? .results : .empty
+    }
+}

WooCommerce/Classes/Bookings/BookingsTabView.swift

@@ -3,9 +3,9 @@ import SwiftUI
 /// Hosting view for `BookingsTabView`
 ///
 final class BookingsTabViewHostingController: UIHostingController<BookingsTabView> {
-    // periphery: ignore
+
     init(siteID: Int64) {
-        super.init(rootView: BookingsTabView())
+        super.init(rootView: BookingsTabView(siteID: siteID))
         configureTabBarItem()
     }
 
@@ -17,16 +17,19 @@ final class BookingsTabViewHostingController: UIHostingController<BookingsTabVie
         return true
     }
 
-    // periphery: ignore
     func didSwitchStore(id: Int64) {
-        // TODO: update view
+        rootView = BookingsTabView(siteID: id)
     }
 }
 
 private extension BookingsTabViewHostingController {
     func configureTabBarItem() {
         tabBarItem.image = UIImage(systemName: "calendar")
-        tabBarItem.title = "Bookings"
+        tabBarItem.title = NSLocalizedString(
+            "bookingsTabViewHostingController.tab.title",
+            value: "Bookings",
+            comment: "Title of the Bookings tab"
+        )
         tabBarItem.accessibilityIdentifier = "tab-bar-bookings-item"
     }
 }
@@ -36,9 +39,15 @@ private extension BookingsTabViewHostingController {
 struct BookingsTabView: View {
     @State private var visibility: NavigationSplitViewVisibility = .all
 
+    private let siteID: Int64
+
+    init(siteID: Int64) {
+        self.siteID = siteID
+    }
+
     var body: some View {
         NavigationSplitView(columnVisibility: $visibility) {
-            Text("Booking List")
+            BookingListView(viewModel: BookingListViewModel(siteID: siteID))
         } detail: {
             Text("Booking Detail Screen")
         }

WooCommerce/WooCommerce.xcodeproj/project.pbxproj

@@ -2838,6 +2838,7 @@
 		DED039292BC7A04B005D0571 /* StorePerformanceView.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED039282BC7A04B005D0571 /* StorePerformanceView.swift */; };
 		DED0392B2BC7A076005D0571 /* StorePerformanceViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED0392A2BC7A076005D0571 /* StorePerformanceViewModel.swift */; };
 		DED0392D2BC7DAFD005D0571 /* StatsTimeRangePicker.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED0392C2BC7DAFD005D0571 /* StatsTimeRangePicker.swift */; };
+		DED1E3172E8556270089909C /* BookingListViewModelTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED1E3152E8556270089909C /* BookingListViewModelTests.swift */; };
 		DED91DFA2AD78A3A00CDCC53 /* BlazeCampaignItemView.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED91DF92AD78A3A00CDCC53 /* BlazeCampaignItemView.swift */; };
 		DED9740B2AD7D09E00122EB4 /* BlazeCampaignListView.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED9740A2AD7D09E00122EB4 /* BlazeCampaignListView.swift */; };
 		DED9740D2AD7D27000122EB4 /* BlazeCampaignListViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = DED9740C2AD7D27000122EB4 /* BlazeCampaignListViewModel.swift */; };
@@ -6062,6 +6063,7 @@
 		DED039282BC7A04B005D0571 /* StorePerformanceView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StorePerformanceView.swift; sourceTree = "<group>"; };
 		DED0392A2BC7A076005D0571 /* StorePerformanceViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StorePerformanceViewModel.swift; sourceTree = "<group>"; };
 		DED0392C2BC7DAFD005D0571 /* StatsTimeRangePicker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StatsTimeRangePicker.swift; sourceTree = "<group>"; };
+		DED1E3152E8556270089909C /* BookingListViewModelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BookingListViewModelTests.swift; sourceTree = "<group>"; };
 		DED91DF92AD78A3A00CDCC53 /* BlazeCampaignItemView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BlazeCampaignItemView.swift; sourceTree = "<group>"; };
 		DED9740A2AD7D09E00122EB4 /* BlazeCampaignListView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BlazeCampaignListView.swift; sourceTree = "<group>"; };
 		DED9740C2AD7D27000122EB4 /* BlazeCampaignListViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BlazeCampaignListViewModel.swift; sourceTree = "<group>"; };
@@ -12981,6 +12983,7 @@
 		D816DDBA22265D8000903E59 /* ViewRelated */ = {
 			isa = PBXGroup;
 			children = (
+				DED1E3162E8556270089909C /* Bookings */,
 				2D7A3E212E7891C400C46401 /* CIAB */,
 				864059FE2C6F67A000DA04DC /* Custom Fields */,
 				86023FAB2B16D80E00A28F07 /* Themes */,
@@ -13710,6 +13713,14 @@
 			path = StoreStats;
 			sourceTree = "<group>";
 		};
+		DED1E3162E8556270089909C /* Bookings */ = {
+			isa = PBXGroup;
+			children = (
+				DED1E3152E8556270089909C /* BookingListViewModelTests.swift */,
+			);
+			path = Bookings;
+			sourceTree = "<group>";
+		};
 		DED91DF72AD78A0C00CDCC53 /* Blaze */ = {
 			isa = PBXGroup;
 			children = (
@@ -17223,6 +17234,7 @@
 				DE78DE442B2846AF002E58DE /* ThemesCarouselViewModelTests.swift in Sources */,
 				DE4D23B029B1D02A003A4B5D /* WPCom2FALoginViewModelTests.swift in Sources */,
 				03B9E52F2A150EED005C77F5 /* MockCardReaderSupportDeterminer.swift in Sources */,
+				DED1E3172E8556270089909C /* BookingListViewModelTests.swift in Sources */,
 				D8C11A6022E2479800D4A88D /* OrderPaymentDetailsViewModelTests.swift in Sources */,
 				B622BC74289CF19400B10CEC /* WaitingTimeTrackerTests.swift in Sources */,
 				023EC2E224DA8BAB0021DA91 /* MockProductSKUValidationStoresManager.swift in Sources */,