NetNewsWire/Mac/AppDelegate.swift

//
//  AppDelegate.swift
//  NetNewsWire
//
//  Created by Brent Simmons on 7/11/15.
//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
//

import AppKit
import UserNotifications
import Articles
import RSTree
import RSWeb
import Account
import RSCore

// If we're not going to import Sparkle, provide dummy protocols to make it easy
// for AppDelegate to comply
#if MAC_APP_STORE || TEST
protocol SPUStandardUserDriverDelegate {}
protocol SPUUpdaterDelegate {}
#else
import Sparkle
#endif

var appDelegate: AppDelegate!

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations, UNUserNotificationCenterDelegate, UnreadCountProvider, SPUStandardUserDriverDelegate, SPUUpdaterDelegate
{

	private struct WindowRestorationIdentifiers {
		static let mainWindow = "mainWindow"
	}
	
	var userNotificationManager: UserNotificationManager!
	var faviconDownloader: FaviconDownloader!
	var imageDownloader: ImageDownloader!
	var authorAvatarDownloader: AuthorAvatarDownloader!
	var webFeedIconDownloader: WebFeedIconDownloader!
	var appName: String!
	
	var refreshTimer: AccountRefreshTimer?
	var syncTimer: ArticleStatusSyncTimer?
	
	var shuttingDown = false {
		didSet {
			if shuttingDown {
				refreshTimer?.shuttingDown = shuttingDown
				refreshTimer?.invalidate()
				syncTimer?.shuttingDown = shuttingDown
				syncTimer?.invalidate()
			}
		}
	}

	@IBOutlet var debugMenuItem: NSMenuItem!
	@IBOutlet var sortByOldestArticleOnTopMenuItem: NSMenuItem!
	@IBOutlet var sortByNewestArticleOnTopMenuItem: NSMenuItem!
	@IBOutlet var groupArticlesByFeedMenuItem: NSMenuItem!
	@IBOutlet var checkForUpdatesMenuItem: NSMenuItem!

	var unreadCount = 0 {
		didSet {
			if unreadCount != oldValue {
				CoalescingQueue.standard.add(self, #selector(updateDockBadge))
				postUnreadCountDidChangeNotification()
			}
		}
	}

	private var mainWindowController: MainWindowController? {
		var bestController: MainWindowController?
		for candidateController in mainWindowControllers {
			if let bestWindow = bestController?.window, let candidateWindow = candidateController.window {
				if bestWindow.orderedIndex > candidateWindow.orderedIndex {
					bestController = candidateController
				}
			} else {
				bestController = candidateController
			}
		}
		return bestController
	}
	
	private var mainWindowControllers = [MainWindowController]()
	private var preferencesWindowController: NSWindowController?
	private var addFeedController: AddFeedController?
	private var addFolderWindowController: AddFolderWindowController?
	private var importOPMLController: ImportOPMLWindowController?
	private var exportOPMLController: ExportOPMLWindowController?
	private var keyboardShortcutsWindowController: WebViewWindowController?
	private var inspectorWindowController: InspectorWindowController?
	private var crashReportWindowController: CrashReportWindowController? // For testing only
	private let log = Log()
	private let appNewsURLString = "https://nnw.ranchero.com/feed.json"
	private let appMovementMonitor = RSAppMovementMonitor()
	#if !MAC_APP_STORE && !TEST
	private var softwareUpdater: SPUUpdater!
	#endif

	override init() {
		NSWindow.allowsAutomaticWindowTabbing = false
		super.init()

		AccountManager.shared = AccountManager(accountsFolder: Platform.dataSubfolder(forApplication: nil, folderName: "Accounts")!)
		
		NotificationCenter.default.addObserver(self, selector: #selector(unreadCountDidChange(_:)), name: .UnreadCountDidChange, object: nil)
		NotificationCenter.default.addObserver(self, selector: #selector(inspectableObjectsDidChange(_:)), name: .InspectableObjectsDidChange, object: nil)
		NSWorkspace.shared.notificationCenter.addObserver(self, selector: #selector(didWakeNotification(_:)), name: NSWorkspace.didWakeNotification, object: nil)

		appDelegate = self
	}

	// MARK: - API
	func logMessage(_ message: String, type: LogItem.ItemType) {

		#if DEBUG
		if type == .debug {
			print("logMessage: \(message) - \(type)")
		}
		#endif

		let logItem = LogItem(type: type, message: message)
		log.add(logItem)
	}

	func logDebugMessage(_ message: String) {
		logMessage(message, type: .debug)
	}

	func showAddFolderSheetOnWindow(_ window: NSWindow) {
		addFolderWindowController = AddFolderWindowController()
		addFolderWindowController!.runSheetOnWindow(window)
	}

	func showAddFeedSheetOnWindow(_ window: NSWindow, urlString: String?, name: String?, account: Account?, folder: Folder?) {

		addFeedController = AddFeedController(hostWindow: window)
		addFeedController?.showAddFeedSheet(urlString, name, account, folder)
	}
	
	// MARK: - NSApplicationDelegate
	
	func applicationWillFinishLaunching(_ notification: Notification) {
		installAppleEventHandlers()
		
		CacheCleaner.purgeIfNecessary()

		// Try to establish a cache in the Caches folder, but if it fails for some reason fall back to a temporary dir
		let cacheFolder: String
		if let userCacheFolder = try? FileManager.default.url(for: .cachesDirectory, in: .userDomainMask, appropriateFor: nil, create: false).path {
			cacheFolder = userCacheFolder
		}
		else {
			let bundleIdentifier = (Bundle.main.infoDictionary!["CFBundleIdentifier"]! as! String)
			cacheFolder = (NSTemporaryDirectory() as NSString).appendingPathComponent(bundleIdentifier)
		}

		let faviconsFolder = (cacheFolder as NSString).appendingPathComponent("Favicons")
		let faviconsFolderURL = URL(fileURLWithPath: faviconsFolder)
		try! FileManager.default.createDirectory(at: faviconsFolderURL, withIntermediateDirectories: true, attributes: nil)
		faviconDownloader = FaviconDownloader(folder: faviconsFolder)

		let imagesFolder = (cacheFolder as NSString).appendingPathComponent("Images")
		let imagesFolderURL = URL(fileURLWithPath: imagesFolder)
		try! FileManager.default.createDirectory(at: imagesFolderURL, withIntermediateDirectories: true, attributes: nil)
		imageDownloader = ImageDownloader(folder: imagesFolder)

		authorAvatarDownloader = AuthorAvatarDownloader(imageDownloader: imageDownloader)
		webFeedIconDownloader = WebFeedIconDownloader(imageDownloader: imageDownloader, folder: cacheFolder)

		appName = (Bundle.main.infoDictionary!["CFBundleExecutable"]! as! String)
	}
	
	func applicationDidFinishLaunching(_ note: Notification) {

		#if MAC_APP_STORE || TEST
			checkForUpdatesMenuItem.isHidden = true
		#else
			// Initialize Sparkle...
			let hostBundle = Bundle.main
			let updateDriver = SPUStandardUserDriver(hostBundle: hostBundle, delegate: self)
			self.softwareUpdater = SPUUpdater(hostBundle: hostBundle, applicationBundle: hostBundle, userDriver: updateDriver, delegate: self)

			do {
				try self.softwareUpdater.start()
			}
			catch {
				NSLog("Failed to start software updater with error: \(error)")
			}
		#endif
		
		AppDefaults.registerDefaults()
		let isFirstRun = AppDefaults.isFirstRun
		if isFirstRun {
			logDebugMessage("Is first run.")
		}
		let localAccount = AccountManager.shared.defaultAccount

		if isFirstRun && !AccountManager.shared.anyAccountHasAtLeastOneFeed() {
			// Import feeds. Either old NNW 3 feeds or the default feeds.
			if !NNW3ImportController.importSubscriptionsIfFileExists(account: localAccount) {
				DefaultFeedsImporter.importDefaultFeeds(account: localAccount)
			}
		}

		updateSortMenuItems()
		updateGroupByFeedMenuItem()
		
		if mainWindowController == nil {
			let mainWindowController = createAndShowMainWindow()
			mainWindowController.restoreStateFromUserDefaults()
		}
		
		if isFirstRun {
			mainWindowController?.window?.center()
		}

		NotificationCenter.default.addObserver(self, selector: #selector(webFeedSettingDidChange(_:)), name: .WebFeedSettingDidChange, object: nil)
		NotificationCenter.default.addObserver(self, selector: #selector(userDefaultsDidChange(_:)), name: UserDefaults.didChangeNotification, object: nil)

		DispatchQueue.main.async {
			self.unreadCount = AccountManager.shared.unreadCount
		}

		if InspectorWindowController.shouldOpenAtStartup {
			self.toggleInspectorWindow(self)
		}

		refreshTimer = AccountRefreshTimer()
		syncTimer = ArticleStatusSyncTimer()
		
		UNUserNotificationCenter.current().requestAuthorization(options:[.badge, .sound, .alert]) { (granted, error) in
			if granted {
				DispatchQueue.main.async {
					NSApplication.shared.registerForRemoteNotifications()
				}
			}
		}

		UNUserNotificationCenter.current().delegate = self
		userNotificationManager = UserNotificationManager()

		if AppDefaults.showDebugMenu {
 			refreshTimer!.update()
 			syncTimer!.update()

  			// The Web Inspector uses SPI and can never appear in a MAC_APP_STORE build.
 			#if MAC_APP_STORE
 			let debugMenu = debugMenuItem.submenu!
 			let toggleWebInspectorItemIndex = debugMenu.indexOfItem(withTarget: self, andAction: #selector(toggleWebInspectorEnabled(_:)))
 			if toggleWebInspectorItemIndex != -1 {
 				debugMenu.removeItem(at: toggleWebInspectorItemIndex)
 			}
 			#endif
 		} else {
			debugMenuItem.menu?.removeItem(debugMenuItem)
			DispatchQueue.main.async {
				self.refreshTimer!.timedRefresh(nil)
				self.syncTimer!.timedRefresh(nil)
			}
		}

		#if !MAC_APP_STORE
			DispatchQueue.main.async {
				CrashReporter.check(appName: "NetNewsWire")
			}
		#endif
		
        NSApplication.shared.registerForRemoteNotifications()
	}
	
	func application(_ application: NSApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([NSUserActivityRestoring]) -> Void) -> Bool {
		guard let mainWindowController = mainWindowController else {
			return false
		}
		mainWindowController.handle(userActivity)
		return true
	}

	func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
		// https://github.com/brentsimmons/NetNewsWire/issues/522
		// I couldn’t reproduce the crashing bug, but it appears to happen on creating a main window
		// and its views and view controllers. The check below is so that the app does nothing
		// if the window doesn’t already exist — because it absolutely *should* exist already.
		// And if the window exists, then maybe the views and view controllers are also already loaded?
		// We’ll try this, and then see if we get more crash logs like this or not.
		guard let mainWindowController = mainWindowController, mainWindowController.isWindowLoaded else {
			return false
		}
		mainWindowController.showWindow(self)
		return false
	}

	func applicationDidBecomeActive(_ notification: Notification) {
		fireOldTimers()
	}
	
	func applicationDidResignActive(_ notification: Notification) {

		ArticleStringFormatter.emptyCaches()

		saveState()
	}

	func application(_ application: NSApplication, didReceiveRemoteNotification userInfo: [String : Any]) {
		AccountManager.shared.receiveRemoteNotification(userInfo: userInfo)
	}
	
	func applicationWillTerminate(_ notification: Notification) {
		shuttingDown = true
		saveState()
		
		let group = DispatchGroup()
		
		group.enter()
		AccountManager.shared.syncArticleStatusAll() {
			group.leave()
		}
		
		let timeout = DispatchTime.now() + .seconds(1)
		_ = group.wait(timeout: timeout)
	}

	// MARK: Notifications
	@objc func unreadCountDidChange(_ note: Notification) {

		if note.object is AccountManager {
			unreadCount = AccountManager.shared.unreadCount
		}
	}

	@objc func webFeedSettingDidChange(_ note: Notification) {

		guard let feed = note.object as? WebFeed, let key = note.userInfo?[WebFeed.WebFeedSettingUserInfoKey] as? String else {
			return
		}
		if key == WebFeed.WebFeedSettingKey.homePageURL || key == WebFeed.WebFeedSettingKey.faviconURL {
			let _ = faviconDownloader.favicon(for: feed)
		}
	}

	@objc func inspectableObjectsDidChange(_ note: Notification) {

		guard let inspectorWindowController = inspectorWindowController, inspectorWindowController.isOpen else {
			return
		}
		inspectorWindowController.objects = objectsForInspector()
	}

	@objc func userDefaultsDidChange(_ note: Notification) {
		updateSortMenuItems()
		updateGroupByFeedMenuItem()
		refreshTimer?.update()
		updateDockBadge()
	}
	
	@objc func didWakeNotification(_ note: Notification) {
		fireOldTimers()
	}

	// MARK: Main Window
	
	func createMainWindowController() -> MainWindowController {
		let controller = windowControllerWithName("MainWindow") as! MainWindowController
		if !(mainWindowController?.isOpen ?? false) {
			mainWindowControllers.removeAll()
		}
		mainWindowControllers.append(controller)
		return controller
	}

	func windowControllerWithName(_ storyboardName: String) -> NSWindowController {
		let storyboard = NSStoryboard(name: NSStoryboard.Name(storyboardName), bundle: nil)
		return storyboard.instantiateInitialController()! as! NSWindowController
	}

	@discardableResult
	func createAndShowMainWindow() -> MainWindowController {
		let controller = createMainWindowController()
		controller.showWindow(self)
		
		if let window = controller.window {
			window.restorationClass = Self.self
			window.identifier = NSUserInterfaceItemIdentifier(rawValue: WindowRestorationIdentifiers.mainWindow)
		}
		
		return controller
	}

	func createAndShowMainWindowIfNecessary() {
		if mainWindowController == nil {
			createAndShowMainWindow()
		} else {
			mainWindowController?.showWindow(self)
		}
	}

	func removeMainWindow(_ windowController: MainWindowController) {
		guard mainWindowControllers.count > 1 else { return }
		if let index = mainWindowControllers.firstIndex(of: windowController) {
			mainWindowControllers.remove(at: index)
		}
	}
	
	// MARK: NSUserInterfaceValidations
	func validateUserInterfaceItem(_ item: NSValidatedUserInterfaceItem) -> Bool {
		if shuttingDown {
			return false
		}

		let isDisplayingSheet = mainWindowController?.isDisplayingSheet ?? false

		if item.action == #selector(refreshAll(_:)) {
			return !AccountManager.shared.refreshInProgress && !AccountManager.shared.activeAccounts.isEmpty
		}
		if item.action == #selector(addAppNews(_:)) {
			return !isDisplayingSheet && !AccountManager.shared.anyAccountHasFeedWithURL(appNewsURLString) && !AccountManager.shared.activeAccounts.isEmpty
		}
		if item.action == #selector(sortByNewestArticleOnTop(_:)) || item.action == #selector(sortByOldestArticleOnTop(_:)) {
			return mainWindowController?.isOpen ?? false
		}
		if item.action == #selector(showAddFeedWindow(_:)) || item.action == #selector(showAddFolderWindow(_:)) {
			return !isDisplayingSheet && !AccountManager.shared.activeAccounts.isEmpty
		}
		#if !MAC_APP_STORE
		if item.action == #selector(toggleWebInspectorEnabled(_:)) {
			(item as! NSMenuItem).state = AppDefaults.webInspectorEnabled ? .on : .off
		}
		#endif
		return true
	}

	// MARK: UNUserNotificationCenterDelegate
	
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .badge, .sound])
    }
	
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
		mainWindowController?.handle(response)
		completionHandler()
    }
	
	// MARK: Add Feed
	func addFeed(_ urlString: String?, name: String? = nil, account: Account? = nil, folder: Folder? = nil) {
		createAndShowMainWindowIfNecessary()
		
		if mainWindowController!.isDisplayingSheet {
			return
		}

		showAddFeedSheetOnWindow(mainWindowController!.window!, urlString: urlString, name: name, account: account, folder: folder)
	}

	// MARK: - Dock Badge
	@objc func updateDockBadge() {
		let label = unreadCount > 0 && !AppDefaults.hideDockUnreadCount ? "\(unreadCount)" : ""
		NSApplication.shared.dockTile.badgeLabel = label
	}

	// MARK: - Actions
	@IBAction func showPreferences(_ sender: Any?) {
		if preferencesWindowController == nil {
			preferencesWindowController = windowControllerWithName("Preferences")
		}

		preferencesWindowController!.showWindow(self)
	}

	@IBAction func newMainWindow(_ sender: Any?) {
		createAndShowMainWindow()
	}

	@IBAction func showMainWindow(_ sender: Any?) {
		createAndShowMainWindowIfNecessary()
		mainWindowController?.window?.makeKey()
	}

	@IBAction func refreshAll(_ sender: Any?) {
		AccountManager.shared.refreshAll(errorHandler: ErrorHandler.present)
	}

	@IBAction func showAddFeedWindow(_ sender: Any?) {
		addFeed(nil)
	}

	@IBAction func showAddFolderWindow(_ sender: Any?) {
		createAndShowMainWindowIfNecessary()
		showAddFolderSheetOnWindow(mainWindowController!.window!)
	}

	@IBAction func showKeyboardShortcutsWindow(_ sender: Any?) {
		if keyboardShortcutsWindowController == nil {
			
			keyboardShortcutsWindowController = WebViewWindowController(title: NSLocalizedString("Keyboard Shortcuts", comment: "window title"))
			let htmlFile = Bundle(for: type(of: self)).path(forResource: "KeyboardShortcuts", ofType: "html")!
			keyboardShortcutsWindowController?.displayContents(of: htmlFile)

			if let window = keyboardShortcutsWindowController?.window {
				let point = NSPoint(x: 128, y: 64)
				let size = NSSize(width: 620, height: 1100)
				let minSize = NSSize(width: 400, height: 400)
				window.setPointAndSizeAdjustingForScreen(point: point, size: size, minimumSize: minSize)
			}
			
		}

		keyboardShortcutsWindowController!.showWindow(self)
	}

	@IBAction func toggleInspectorWindow(_ sender: Any?) {
		if inspectorWindowController == nil {
			inspectorWindowController = (windowControllerWithName("Inspector") as! InspectorWindowController)
		}

		if inspectorWindowController!.isOpen {
			inspectorWindowController!.window!.performClose(self)
		}
		else {
			inspectorWindowController!.objects = objectsForInspector()
			inspectorWindowController!.showWindow(self)
		}
	}

	@IBAction func importOPMLFromFile(_ sender: Any?) {
		createAndShowMainWindowIfNecessary()
		if mainWindowController!.isDisplayingSheet {
			return
		}
		
		importOPMLController = ImportOPMLWindowController()
		importOPMLController?.runSheetOnWindow(mainWindowController!.window!)
	}
	
	@IBAction func importNNW3FromFile(_ sender: Any?) {
		createAndShowMainWindowIfNecessary()
		if mainWindowController!.isDisplayingSheet {
			return
		}
		NNW3ImportController.askUserToImportNNW3Subscriptions(window: mainWindowController!.window!)
	}
	
	@IBAction func exportOPML(_ sender: Any?) {
		createAndShowMainWindowIfNecessary()
		if mainWindowController!.isDisplayingSheet {
			return
		}
		
		exportOPMLController = ExportOPMLWindowController()
		exportOPMLController?.runSheetOnWindow(mainWindowController!.window!)
	}
	
	@IBAction func addAppNews(_ sender: Any?) {
		if AccountManager.shared.anyAccountHasFeedWithURL(appNewsURLString) {
			return
		}
		addFeed(appNewsURLString, name: "NetNewsWire News")
	}

	@IBAction func openWebsite(_ sender: Any?) {

		Browser.open("https://ranchero.com/netnewswire/", inBackground: false)
	}

	@IBAction func openHowToSupport(_ sender: Any?) {
		
		Browser.open("https://github.com/brentsimmons/NetNewsWire/blob/master/Technotes/HowToSupportNetNewsWire.markdown", inBackground: false)
	}
	
	@IBAction func openRepository(_ sender: Any?) {

		Browser.open("https://github.com/brentsimmons/NetNewsWire", inBackground: false)
	}

	@IBAction func openBugTracker(_ sender: Any?) {

		Browser.open("https://github.com/brentsimmons/NetNewsWire/issues", inBackground: false)
	}

	@IBAction func openSlackGroup(_ sender: Any?) {
		Browser.open("https://ranchero.com/netnewswire/slack", inBackground: false)
	}

	@IBAction func openTechnotes(_ sender: Any?) {

		Browser.open("https://github.com/brentsimmons/NetNewsWire/tree/master/Technotes", inBackground: false)
	}

	@IBAction func showHelp(_ sender: Any?) {

		Browser.open("https://ranchero.com/netnewswire/help/mac/5.0/en/", inBackground: false)
	}

	@IBAction func donateToAppCampForGirls(_ sender: Any?) {
		Browser.open("https://appcamp4girls.com/contribute/", inBackground: false)
	}

	@IBAction func showPrivacyPolicy(_ sender: Any?) {
		Browser.open("https://ranchero.com/netnewswire/privacypolicy", inBackground: false)
	}

	@IBAction func debugDropConditionalGetInfo(_ sender: Any?) {
		#if DEBUG
			AccountManager.shared.activeAccounts.forEach{ $0.debugDropConditionalGetInfo() }
		#endif
	}

	@IBAction func debugTestCrashReporterWindow(_ sender: Any?) {
		#if DEBUG
			crashReportWindowController = CrashReportWindowController(crashLogText: "This is a test crash log.")
			crashReportWindowController!.testing = true
			crashReportWindowController!.showWindow(self)
		#endif
	}

	@IBAction func debugTestCrashReportSending(_ sender: Any?) {
		#if DEBUG
			CrashReporter.sendCrashLogText("This is a test. Hi, Brent.")
		#endif
	}

	@IBAction func gotoToday(_ sender: Any?) {

		createAndShowMainWindowIfNecessary()
		mainWindowController!.gotoToday(sender)
	}

	@IBAction func gotoAllUnread(_ sender: Any?) {

		createAndShowMainWindowIfNecessary()
		mainWindowController!.gotoAllUnread(sender)
	}

	@IBAction func gotoStarred(_ sender: Any?) {

		createAndShowMainWindowIfNecessary()
		mainWindowController!.gotoStarred(sender)
	}

	@IBAction func sortByOldestArticleOnTop(_ sender: Any?) {

		AppDefaults.timelineSortDirection = .orderedAscending
	}

	@IBAction func sortByNewestArticleOnTop(_ sender: Any?) {

		AppDefaults.timelineSortDirection = .orderedDescending
	}
	
	@IBAction func groupByFeedToggled(_ sender: NSMenuItem) {		
		AppDefaults.timelineGroupByFeed.toggle()
	}

	@IBAction func checkForUpdates(_ sender: Any?) {
		#if !MAC_APP_STORE && !TEST
			self.softwareUpdater.checkForUpdates()
		#endif
	}

}

// MARK: - Debug Menu
extension AppDelegate {

	@IBAction func debugSearch(_ sender: Any?) {
		AccountManager.shared.defaultAccount.debugRunSearch()
	}

	@IBAction func toggleWebInspectorEnabled(_ sender: Any?) {
		#if !MAC_APP_STORE
			let newValue = !AppDefaults.webInspectorEnabled
			AppDefaults.webInspectorEnabled = newValue

			// An attached inspector can display incorrectly on certain setups (like mine); default to displaying in a separate window,
			// and reset the default to a separate window when the preference is toggled off and on again in case the inspector is
			// accidentally reattached.
			AppDefaults.webInspectorStartsAttached = false
			NotificationCenter.default.post(name: .WebInspectorEnabledDidChange, object: newValue)
		#endif
	}
}

private extension AppDelegate {

	func fireOldTimers() {
		// It’s possible there’s a refresh timer set to go off in the past.
		// In that case, refresh now and update the timer.
		refreshTimer?.fireOldTimer()
		syncTimer?.fireOldTimer()
	}
	
	func objectsForInspector() -> [Any]? {

		guard let window = NSApplication.shared.mainWindow, let windowController = window.windowController as? MainWindowController else {
			return nil
		}
		return windowController.selectedObjectsInSidebar()
	}

	func saveState() {
		mainWindowController?.saveStateToUserDefaults()
		inspectorWindowController?.saveState()
	}

	func updateSortMenuItems() {

		let sortByNewestOnTop = AppDefaults.timelineSortDirection == .orderedDescending
		sortByNewestArticleOnTopMenuItem.state = sortByNewestOnTop ? .on : .off
		sortByOldestArticleOnTopMenuItem.state = sortByNewestOnTop ? .off : .on
	}
	
	func updateGroupByFeedMenuItem() {
		let groupByFeedEnabled = AppDefaults.timelineGroupByFeed
		groupArticlesByFeedMenuItem.state = groupByFeedEnabled ? .on : .off
	}
}

/*
    the ScriptingAppDelegate protocol exposes a narrow set of accessors with
    internal visibility which are very similar to some private vars.
    
    These would be unnecessary if the similar accessors were marked internal rather than private,
    but for now, we'll keep the stratification of visibility
*/
extension AppDelegate : ScriptingAppDelegate {

    internal var scriptingMainWindowController: ScriptingMainWindowController? {
        return mainWindowController
    }

    internal var  scriptingCurrentArticle: Article? {
        return self.scriptingMainWindowController?.scriptingCurrentArticle
    }

    internal var  scriptingSelectedArticles: [Article] {
        return self.scriptingMainWindowController?.scriptingSelectedArticles ?? []
    }
}

extension AppDelegate: NSWindowRestoration {
	
	@objc static func restoreWindow(withIdentifier identifier: NSUserInterfaceItemIdentifier, state: NSCoder, completionHandler: @escaping (NSWindow?, Error?) -> Void) {
		var mainWindow: NSWindow? = nil
		if identifier.rawValue == WindowRestorationIdentifiers.mainWindow {
			mainWindow = appDelegate.createAndShowMainWindow().window
		}
		completionHandler(mainWindow, nil)
	}
	
}