Onboarding (#393)

* button setup

* LibraryCategoryView message

* refactor

* deprecation

* ActionCell

* onboarding

* LibraryLanguageView sort order

* preload favicons

* refresh when on screen

* dependency

* schema

Kiwix.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -15,8 +15,8 @@
         "repositoryURL": "https://github.com/realm/realm-cocoa",
         "state": {
           "branch": null,
-          "revision": "83a07f6a508c3427058d9e2c466208d0b6a960fa",
-          "version": "10.12.0"
+          "revision": "e7e7f072a1571435049683ca43c51501de2612fd",
+          "version": "10.14.0"
         }
       },
       {
@@ -24,8 +24,8 @@
         "repositoryURL": "https://github.com/realm/realm-core",
         "state": {
           "branch": null,
-          "revision": "e72b3078bfc5c3f69a0b18f7a220be27e28c463f",
-          "version": "11.2.0"
+          "revision": "fdb2157346dcdf0c2677b3608d9a4c30315fa7f0",
+          "version": "11.3.1"
         }
       },
       {

Model/Operations/OPDSRefreshOperation/OPDSRefreshOperation.swift

@@ -28,11 +28,23 @@ class OPDSRefreshOperation: Operation {
             let parser = OPDSStreamParser()
             try parser.parse(data: data)
             try processData(parser: parser)
+            
+            // if library has never been refreshed before, preload wikipedia favicons
+            if Defaults[.libraryLastRefresh] == nil, let languageCode = Locale.current.languageCode {
+                (try? Realm())?.objects(ZimFile.self)
+                    .filter(NSCompoundPredicate(andPredicateWithSubpredicates: [
+                        NSPredicate(format: "categoryRaw = %@", ZimFile.Category.wikipedia.rawValue),
+                        NSPredicate(format: "languageCode = %@", languageCode),
+                        NSPredicate(format: "faviconData = nil"),
+                        NSPredicate(format: "faviconURL != nil"),
+                    ]))
+                    .forEach { FaviconDownloadService.shared.download(zimFile: $0) }
+            }
 
             DispatchQueue.main.sync {
-                // apply language filter if library has never been refreshed
-                if Defaults[.libraryLastRefresh] == nil, let code = Locale.current.languageCode {
-                    Defaults[.libraryLanguageCodes] = [code]
+                // if library has never been refreshed before, apply initial language filter
+                if Defaults[.libraryLastRefresh] == nil, let languageCode = Locale.current.languageCode {
+                    Defaults[.libraryLanguageCodes] = [languageCode]
                 }
 
                 // update last library refresh time

Model/Realm/ZimFile.swift

@@ -24,12 +24,12 @@ class ZimFile: Object, ObjectKeyIdentifiable {
     @Persisted(indexed: true) var languageCode: String = ""
     @Persisted(indexed: true) var creationDate: Date = Date()
     @Persisted(indexed: true) var size: Int64 = 0
-    @Persisted var articleCount: Int64 = 0
-    @Persisted var mediaCount: Int64 = 0
+    @Persisted(indexed: true) var articleCount: Int64 = 0
+    @Persisted(indexed: true) var mediaCount: Int64 = 0
+    @Persisted(indexed: true) var categoryRaw: String = Category.other.rawValue
+    @Persisted(indexed: true) var stateRaw: String = State.remote.rawValue
     @Persisted var creator: String = ""
     @Persisted var publisher: String = ""
-    @Persisted var categoryRaw: String = Category.other.rawValue
-    @Persisted var stateRaw: String = State.remote.rawValue
     
     // MARK: - bool properties
     

Model/Services/LibraryService.swift

@@ -10,15 +10,12 @@ import os
 #if canImport(UIKit)
 import UIKit
 #endif
-import Combine
 import Defaults
 import RealmSwift
 
 class LibraryService {
     static let shared = LibraryService()
     
-    private var faviconDownloadPipeline: Any?
-    
     func isFileInDocumentDirectory(zimFileID: String) -> Bool {
         if let fileName = ZimFileService.shared.getFileURL(zimFileID: zimFileID)?.lastPathComponent,
             let documentDirectoryURL = try? FileManager.default.url(
@@ -60,6 +57,11 @@ class LibraryService {
 
     #if canImport(UIKit)
     static let autoUpdateInterval: TimeInterval = 3600.0 * 6
+    static var isOutdated: Bool {
+        guard let lastRefresh = Defaults[.libraryLastRefresh] else { return true }
+        return Date().timeIntervalSince(lastRefresh) > LibraryService.autoUpdateInterval
+    }
+    
     func applyAutoUpdateSetting() {
         UIApplication.shared.setMinimumBackgroundFetchInterval(
             Defaults[.libraryAutoRefresh] ? LibraryService.autoUpdateInterval : UIApplication.backgroundFetchIntervalNever

Model/Utilities/Enums.swift

@@ -24,9 +24,10 @@ enum ExternalLinkLoadingPolicy: String, CaseIterable, CustomStringConvertible, I
     }
 }
 
-enum LibraryLanguageSortingMode: String, Codable, CustomStringConvertible, Defaults.Serializable {
+enum LibraryLanguageSortingMode: String, CaseIterable, Codable, CustomStringConvertible, Identifiable, Defaults.Serializable {
     case alphabetically, byCount
     
+    var id: String { self.rawValue }
     var description: String {
         switch self {
         case .alphabetically:

iOS/Controller/Library/LibraryViewController.swift

@@ -8,6 +8,7 @@
 
 import SwiftUI
 import UIKit
+import Defaults
 import RealmSwift
 
 @available(iOS 13.0, *)
@@ -67,6 +68,11 @@ class LibraryViewController: UISplitViewController, UISplitViewControllerDelegat
         searchResultsController.rootView.zimFileSelected = {
             [unowned self] zimFileID, title in self.showZimFile(zimFileID, title)
         }
+        
+        // refresh library when library is opened, but only when library has been previously refreshed
+        if Defaults[.libraryLastRefresh] != nil, Defaults[.libraryAutoRefresh], LibraryService.isOutdated {
+            LibraryOperationQueue.shared.addOperation(OPDSRefreshOperation())
+        }
     }
     
     // MARK: - Delegates

iOS/SwiftUI/BuildingBlocks.swift

@@ -13,22 +13,28 @@ import WebKit
 struct ActionCell: View {
     let title: String
     let isDestructive: Bool
+    let alignment: HorizontalAlignment
     let action: (() -> Void)
     
-    init(title: String, isDestructive: Bool = false, action: @escaping (() -> Void) = {}) {
+    init(title: String,
+         isDestructive: Bool = false,
+         alignment: HorizontalAlignment = .center,
+         action: @escaping (() -> Void) = {}
+    ) {
         self.title = title
         self.isDestructive = isDestructive
+        self.alignment = alignment
         self.action = action
     }
     
     var body: some View {
         Button(action: action, label: {
             HStack {
-                Spacer()
+                if alignment != .leading { Spacer() }
                 Text(title)
                     .fontWeight(.medium)
                     .foregroundColor(isDestructive ? .red : nil)
-                Spacer()
+                if alignment != .trailing { Spacer() }
             }
         })
     }

iOS/SwiftUI/Library/LibraryCategoryView.swift

@@ -15,6 +15,7 @@ import RealmSwift
 @available(iOS 13.0, *)
 struct LibraryCategoryView: View {
     @ObservedObject private var viewModel: ViewModel
+    @Default(.libraryLastRefresh) private var libraryLastRefresh
     
     let category: ZimFile.Category
     var zimFileTapped: (String, String) -> Void = { _, _ in }
@@ -25,19 +26,7 @@ struct LibraryCategoryView: View {
     }
     
     var body: some View {
-        if let languages = viewModel.languages, languages.isEmpty {
-            InfoView(
-                imageSystemName: {
-                    if #available(iOS 14.0, *) {
-                        return "text.book.closed"
-                    } else {
-                        return "book"
-                    }
-                }(),
-                title: "No Zim Files",
-                help: "Enable some other languages to see zim files under this category."
-            )
-        } else if let languages = viewModel.languages {
+        if let languages = viewModel.languages, !languages.isEmpty {
             List {
                 ForEach(languages) { language in
                     Section(header: languages.count > 1 ? Text(language.name) : nil) {
@@ -50,6 +39,27 @@ struct LibraryCategoryView: View {
                     }
                 }
             }
+        } else if let languages = viewModel.languages, languages.isEmpty {
+            InfoView(
+                imageSystemName: {
+                    if #available(iOS 14.0, *) {
+                        return "text.book.closed"
+                    } else {
+                        return "book"
+                    }
+                }(),
+                title: "No Zim Files",
+                help: {
+                    if libraryLastRefresh == nil {
+                        return "Download online catalog to see zim files under this category."
+                    } else {
+                        return "Enable some other languages to see zim files under this category."
+                    }
+                }()
+            )
+        } else {
+            // show nothing when catagory hasn't been fully loaded
+            EmptyView()
         }
     }
     

iOS/SwiftUI/Library/LibraryLanguageView.swift

@@ -21,17 +21,19 @@ struct LibraryLanguageView: View {
             list.navigationTitle("Languages").toolbar {
                 ToolbarItem(placement: .navigationBarTrailing) {
                     Picker(selection: $sortingMode, label: Image(systemName: "arrow.up.arrow.down")) {
-                        Text("Alphabetically").tag(LibraryLanguageSortingMode.alphabetically)
-                        Text("By Count").tag(LibraryLanguageSortingMode.byCount)
+                        ForEach(LibraryLanguageSortingMode.allCases) { sortingMode in
+                            Text(sortingMode.description).tag(sortingMode)
+                        }
                     }.pickerStyle(MenuPickerStyle())
                 }
             }
         } else {
             list.navigationBarItems(trailing: HStack {
-                Picker("Language Sorting Mode", selection: $sortingMode, content: {
-                    Text("A-Z").tag(LibraryLanguageSortingMode.alphabetically)
-                    Text("By Count").tag(LibraryLanguageSortingMode.byCount)
-                }).pickerStyle(SegmentedPickerStyle())
+                Picker(selection: $sortingMode, label: Image(systemName: "arrow.up.arrow.down")) {
+                    ForEach(LibraryLanguageSortingMode.allCases) { sortingMode in
+                        Text(sortingMode.description).tag(sortingMode)
+                    }
+                }.pickerStyle(SegmentedPickerStyle())
                 Spacer(minLength: 60)
             })
         }

iOS/SwiftUI/Library/LibraryPrimaryView.swift

@@ -7,11 +7,13 @@
 //
 
 import SwiftUI
+import Defaults
 import RealmSwift
 
 /// A list of all on device & downloading zim files and all zim file categories.
 @available(iOS 13.0, *)
 struct LibraryPrimaryView: View {
+    @Default(.libraryLastRefresh) private var libraryLastRefresh
     @ObservedResults(
         ZimFile.self,
         configuration: Realm.defaultConfig,
@@ -27,11 +29,20 @@ struct LibraryPrimaryView: View {
         ),
         sortDescriptor: SortDescriptor(keyPath: "size", ascending: false)
     ) private var download
+    @ObservedObject private var viewModel = ViewModel()
     var zimFileSelected: (String, String) -> Void = { _, _ in }
     var categorySelected: (ZimFile.Category) -> Void = { _ in }
     
     var body: some View {
         List {
+            if onDevice.count == 0, libraryLastRefresh == nil {
+                Section(header: Text("Get Started")) {
+                    ActionCell(
+                        title: viewModel.isRefreshing ? "Refreshing..." : "Download Online Catalog",
+                        alignment: .leading
+                    ) { viewModel.refresh() }.disabled(viewModel.isRefreshing)
+                }
+            }
             if onDevice.count > 0 {
                 Section(header: Text("On Device")) {
                     ForEach(onDevice) { zimFile in
@@ -72,4 +83,20 @@ struct LibraryPrimaryView: View {
             }
         }.listStyle(GroupedListStyle())
     }
+    
+    class ViewModel: ObservableObject {
+        @Published private(set) var isRefreshing = false
+        
+        init() {
+            if let operation = LibraryOperationQueue.shared.currentOPDSRefreshOperation {
+                isRefreshing = !operation.isFinished
+            }
+        }
+        
+        func refresh() {
+            guard LibraryOperationQueue.shared.currentOPDSRefreshOperation == nil else { return }
+            LibraryOperationQueue.shared.addOperation(OPDSRefreshOperation())
+            isRefreshing = true
+        }
+    }
 }

iOS/SwiftUI/Library/LibrarySettingsView.swift

@@ -59,7 +59,7 @@ struct LibrarySettingsView: View {
     }
     
     private class ViewModel: ObservableObject {
-        @Published var isRefreshing = false
+        @Published private(set) var isRefreshing = false
         
         private var refreshObserver: NSKeyValueObservation?
         private let autoRefreshObserver = Defaults.observe(.libraryAutoRefresh) { _ in