deltachat-ios/deltachat-ios/Controller/SettingsController.swift

import UIKit
import DcCore
import DBDebugToolkit
import Intents

internal final class SettingsViewController: UITableViewController, ProgressAlertHandler {

    private struct SectionConfigs {
        let headerTitle: String?
        let footerTitle: String?
        let cells: [UITableViewCell]
    }

    private enum CellTags: Int {
        case profile = 0
        case showArchive = 1
        case showEmails = 2
        case blockedContacts = 3
        case notifications = 4
        case receiptConfirmation = 5
        case autocryptPreferences = 6
        case sendAutocryptMessage = 7
        case exportBackup = 8
        case advanced = 9
        case help = 10
        case autodel = 11
        case mediaQuality = 12
        case switchAccount = 13
        case videoChat = 14
        case connectivity = 15
    }

    private var dcContext: DcContext
    private let dcAccounts: DcAccounts

    private let externalPathDescr = "File Sharing/Delta Chat"

    let documentInteractionController = UIDocumentInteractionController()

    private var connectivityChangedObserver: NSObjectProtocol?

    // MARK: - ProgressAlertHandler
    weak var progressAlert: UIAlertController?
    var progressObserver: NSObjectProtocol?

    // MARK: - cells
    private lazy var profileCell: ContactCell = {
        let cell = ContactCell(style: .default, reuseIdentifier: nil)
        let cellViewModel = ProfileViewModel(context: dcContext)
        cell.updateCell(cellViewModel: cellViewModel)
        cell.tag = CellTags.profile.rawValue
        cell.accessoryType = .disclosureIndicator
        return cell
    }()

    private lazy var showArchiveCell: UITableViewCell = {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.tag = CellTags.showArchive.rawValue
        cell.textLabel?.text = String.localized("chat_archived_chats_title")
        cell.accessoryType = .disclosureIndicator
        return cell
    }()

    private lazy var showEmailsCell: UITableViewCell = {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.tag = CellTags.showEmails.rawValue
        cell.textLabel?.text = String.localized("pref_show_emails")
        cell.accessoryType = .disclosureIndicator
        cell.detailTextLabel?.text = SettingsClassicViewController.getValString(val: dcContext.showEmails)
        return cell
    }()

    private lazy var blockedContactsCell: UITableViewCell = {
        let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
        cell.tag = CellTags.blockedContacts.rawValue
        cell.textLabel?.text = String.localized("pref_blocked_contacts")
        cell.accessoryType = .disclosureIndicator
        return cell
    }()

    func autodelSummary() -> String {
        let delDeviceAfter = dcContext.getConfigInt("delete_device_after")
        let delServerAfter = dcContext.getConfigInt("delete_server_after")
        if delDeviceAfter==0 && delServerAfter==0 {
            return String.localized("never")
        } else {
            return String.localized("on")
        }
    }

    private lazy var autodelCell: UITableViewCell = {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.tag = CellTags.autodel.rawValue
        cell.textLabel?.text = String.localized("delete_old_messages")
        cell.accessoryType = .disclosureIndicator
        cell.detailTextLabel?.text = autodelSummary()
        return cell
    }()

    private lazy var mediaQualityCell: UITableViewCell = {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.tag = CellTags.mediaQuality.rawValue
        cell.textLabel?.text = String.localized("pref_outgoing_media_quality")
        cell.accessoryType = .disclosureIndicator
        cell.detailTextLabel?.text = MediaQualityController.getValString(val: dcContext.getConfigInt("media_quality"))
        return cell
    }()

    private lazy var videoChatInstanceCell: UITableViewCell = {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.tag = CellTags.videoChat.rawValue
        cell.textLabel?.text = String.localized("videochat_instance")
        cell.accessoryType = .disclosureIndicator
        cell.detailTextLabel?.text = dcContext.getConfig("webrtc_instance")
        return cell
    }()

    private lazy var notificationSwitch: UISwitch = {
        let switchControl = UISwitch()
        switchControl.isOn = !UserDefaults.standard.bool(forKey: "notifications_disabled")
        switchControl.addTarget(self, action: #selector(handleNotificationToggle(_:)), for: .valueChanged)
        return switchControl
    }()

    private lazy var notificationCell: UITableViewCell = {
        let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
        cell.tag = CellTags.notifications.rawValue
        cell.textLabel?.text = String.localized("pref_notifications")
        cell.accessoryView = notificationSwitch
        cell.selectionStyle = .none
        return cell
    }()

    private lazy var receiptConfirmationSwitch: UISwitch = {
        let switchControl = UISwitch()
        switchControl.isOn = dcContext.mdnsEnabled
        switchControl.addTarget(self, action: #selector(handleReceiptConfirmationToggle(_:)), for: .valueChanged)
        return switchControl
    }()

    private lazy var receiptConfirmationCell: UITableViewCell = {
        let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
        cell.tag = CellTags.receiptConfirmation.rawValue
        cell.textLabel?.text = String.localized("pref_read_receipts")
        cell.accessoryView = receiptConfirmationSwitch
        cell.selectionStyle = .none
        return cell
    }()

    private lazy var autocryptSwitch: UISwitch = {
        let switchControl = UISwitch()
        switchControl.isOn = dcContext.e2eeEnabled
        switchControl.addTarget(self, action: #selector(handleAutocryptPreferencesToggle(_:)), for: .valueChanged)
        return switchControl
    }()

    private lazy var autocryptPreferencesCell: UITableViewCell = {
        let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
        cell.tag = CellTags.autocryptPreferences.rawValue
        cell.textLabel?.text = String.localized("autocrypt_prefer_e2ee")
        cell.accessoryView = autocryptSwitch
        cell.selectionStyle = .none
        return cell
    }()

    private lazy var sendAutocryptMessageCell: ActionCell = {
        let cell = ActionCell()
        cell.tag = CellTags.sendAutocryptMessage.rawValue
        cell.actionTitle = String.localized("autocrypt_send_asm_title")
        return cell
    }()

    private lazy var exportBackupCell: ActionCell = {
        let cell = ActionCell()
        cell.tag = CellTags.exportBackup.rawValue
        cell.actionTitle = String.localized("export_backup_desktop")
        return cell
    }()

    private lazy var advancedCell: ActionCell = {
        let cell = ActionCell()
        cell.tag = CellTags.advanced.rawValue
        cell.actionTitle = String.localized("menu_advanced")
        return cell
    }()

    private lazy var switchAccountCell: ActionCell = {
        let cell = ActionCell()
        cell.tag = CellTags.switchAccount.rawValue
        cell.actionTitle = String.localized("switch_account")
        cell.selectionStyle = .default
        return cell
    }()

    private lazy var helpCell: ActionCell = {
        let cell = ActionCell()
        cell.tag = CellTags.help.rawValue
        cell.actionTitle = String.localized("menu_help")
        return cell
    }()

    private lazy var connectivityCell: UITableViewCell = {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.tag = CellTags.connectivity.rawValue
        cell.textLabel?.text = String.localized("connectivity")
        cell.accessoryType = .disclosureIndicator
        return cell
    }()

    private lazy var sections: [SectionConfigs] = {
        var appNameAndVersion = "Delta Chat"
        if let appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String {
            appNameAndVersion += " v" + appVersion
        }
        let profileSection = SectionConfigs(
            headerTitle: String.localized("pref_profile_info_headline"),
            footerTitle: nil,
            cells: [profileCell, switchAccountCell]
        )
        let preferencesSection = SectionConfigs(
            headerTitle: String.localized("pref_chats_and_media"),
            footerTitle: String.localized("pref_read_receipts_explain"),
            cells: [showArchiveCell, showEmailsCell, blockedContactsCell, autodelCell, mediaQualityCell, videoChatInstanceCell, notificationCell, receiptConfirmationCell]
        )
        let autocryptSection = SectionConfigs(
            headerTitle: String.localized("autocrypt"),
            footerTitle: String.localized("autocrypt_explain"),
            cells: [autocryptPreferencesCell, sendAutocryptMessageCell]
        )
        let backupSection = SectionConfigs(
            headerTitle: nil,
            footerTitle: String.localized("pref_backup_explain"),
            cells: [advancedCell, exportBackupCell])
        let helpSection = SectionConfigs(
            headerTitle: nil,
            footerTitle: appNameAndVersion,
            cells: [connectivityCell, helpCell]
        )
        return [profileSection, preferencesSection, autocryptSection, backupSection, helpSection]
    }()

    init(dcAccounts: DcAccounts) {
        self.dcContext = dcAccounts.getSelected()
        self.dcAccounts = dcAccounts
        super.init(style: .grouped)
    }

    required init?(coder _: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        title = String.localized("menu_settings")
        documentInteractionController.delegate = self as? UIDocumentInteractionControllerDelegate
        tableView.rowHeight = UITableView.automaticDimension
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        updateCells()
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        addProgressAlertListener(dcAccounts: dcAccounts, progressName: dcNotificationImexProgress) { [weak self] in
            guard let self = self else { return }

            self.progressAlert?.dismiss(animated: true) {
                if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
                    appDelegate.reloadDcContext()
                }
            }
        }
        connectivityChangedObserver = NotificationCenter.default.addObserver(forName: dcNotificationConnectivityChanged,
                                                                             object: nil,
                                                                             queue: nil) { [weak self] _ in
            guard let self = self else { return }
            self.connectivityCell.detailTextLabel?.text = DcUtils.getConnectivityString(dcContext: self.dcContext,
                                                                                        connectedString: String.localized("connectivity_connected"))
        }
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        let nc = NotificationCenter.default
        if let backupProgressObserver = self.progressObserver {
            nc.removeObserver(backupProgressObserver)
        }
        if let connectivityChangedObserver = self.connectivityChangedObserver {
            NotificationCenter.default.removeObserver(connectivityChangedObserver)
        }
    }

    // MARK: - UITableViewDelegate + UITableViewDatasource


    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        if indexPath.section == 0 && indexPath.row == 0 {
            return ContactCell.cellHeight
        } else {
            return UITableView.automaticDimension
        }
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return sections.count
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return sections[section].cells.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        return sections[indexPath.section].cells[indexPath.row]
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        guard let cell = tableView.cellForRow(at: indexPath), let cellTag = CellTags(rawValue: cell.tag) else {
            safe_fatalError()
            return
        }
        tableView.deselectRow(at: indexPath, animated: false)

        switch cellTag {
        case .profile: showEditSettingsController()
        case .showArchive: showArchivedCharts()
        case .showEmails: showClassicMail()
        case .blockedContacts: showBlockedContacts()
        case .autodel: showAutodelOptions()
        case .mediaQuality: showMediaQuality()
        case .videoChat: showVideoChatInstance()
        case .notifications: break
        case .receiptConfirmation: break
        case .autocryptPreferences: break
        case .sendAutocryptMessage: sendAutocryptSetupMessage()
        case .exportBackup: createBackup()
        case .advanced: showAdvancedDialog()
        case .switchAccount: showSwitchAccountMenu()
        case .help: showHelp()
        case .connectivity: showConnectivity()
        }
    }

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return sections[section].headerTitle
    }

    override func tableView(_ tableView: UITableView, titleForFooterInSection section: Int) -> String? {
        return sections[section].footerTitle
    }

    // MARK: - actions

    private func createBackup() {
        let alert = UIAlertController(title: String.localized("pref_backup_export_explain"), message: nil, preferredStyle: .safeActionSheet)
        alert.addAction(UIAlertAction(title: String.localized("pref_backup_export_start_button"), style: .default, handler: { _ in
            self.dismiss(animated: true, completion: nil)
            self.startImex(what: DC_IMEX_EXPORT_BACKUP)
        }))
        alert.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel, handler: nil))
        present(alert, animated: true, completion: nil)
    }

    @objc private func handleNotificationToggle(_ sender: UISwitch) {
        UserDefaults.standard.set(!sender.isOn, forKey: "notifications_disabled")
        if sender.isOn {
            if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
                appDelegate.registerForNotifications()
            }
        } else {
            NotificationManager.removeAllNotifications()
        }
        UserDefaults.standard.synchronize()
        NotificationManager.updateApplicationIconBadge(dcContext: dcContext, reset: !sender.isOn)
    }

    @objc private func handleReceiptConfirmationToggle(_ sender: UISwitch) {
        dcContext.mdnsEnabled = sender.isOn
    }

    @objc private func handleAutocryptPreferencesToggle(_ sender: UISwitch) {
        dcContext.e2eeEnabled = sender.isOn
    }

    private func sendAutocryptSetupMessage() {
        let askAlert = UIAlertController(title: String.localized("autocrypt_send_asm_explain_before"), message: nil, preferredStyle: .safeActionSheet)
        askAlert.addAction(UIAlertAction(title: String.localized("autocrypt_send_asm_title"), style: .default, handler: { _ in
            let waitAlert = UIAlertController(title: String.localized("one_moment"), message: nil, preferredStyle: .alert)
            waitAlert.addAction(UIAlertAction(title: String.localized("cancel"), style: .default, handler: { _ in self.dcContext.stopOngoingProcess() }))
            self.present(waitAlert, animated: true, completion: nil)
            DispatchQueue.global(qos: .background).async {
                let sc = self.dcContext.initiateKeyTransfer()
                DispatchQueue.main.async {
                    waitAlert.dismiss(animated: true, completion: nil)
                    guard var sc = sc else {
                        return
                    }
                    if sc.count == 44 {
                        // format setup code to the typical 3 x 3 numbers
                        sc = sc.substring(0, 4) + "  -  " + sc.substring(5, 9) + "  -  " + sc.substring(10, 14) + "  -\n\n" +
                            sc.substring(15, 19) + "  -  " + sc.substring(20, 24) + "  -  " + sc.substring(25, 29) + "  -\n\n" +
                            sc.substring(30, 34) + "  -  " + sc.substring(35, 39) + "  -  " + sc.substring(40, 44)
                    }

                    let text = String.localizedStringWithFormat(String.localized("autocrypt_send_asm_explain_after"), sc)
                    let showAlert = UIAlertController(title: text, message: nil, preferredStyle: .alert)
                    showAlert.addAction(UIAlertAction(title: String.localized("ok"), style: .default, handler: nil))
                    self.present(showAlert, animated: true, completion: nil)
                }
            }
        }))
        askAlert.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel, handler: nil))
        present(askAlert, animated: true, completion: nil)
    }

    private func showAdvancedDialog() {
        let alert = UIAlertController(title: String.localized("menu_advanced"), message: nil, preferredStyle: .safeActionSheet)

        alert.addAction(UIAlertAction(title: String.localized("pref_managekeys_export_secret_keys"), style: .default, handler: { _ in
            let msg = String.localizedStringWithFormat(String.localized("pref_managekeys_export_explain"), self.externalPathDescr)
            let alert = UIAlertController(title: nil, message: msg, preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: String.localized("ok"), style: .default, handler: { _ in
                self.startImex(what: DC_IMEX_EXPORT_SELF_KEYS)
            }))
            alert.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }))

        alert.addAction(UIAlertAction(title: String.localized("pref_managekeys_import_secret_keys"), style: .default, handler: { _ in
            let msg = String.localizedStringWithFormat(String.localized("pref_managekeys_import_explain"), self.externalPathDescr)
            let alert = UIAlertController(title: nil, message: msg, preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: String.localized("ok"), style: .default, handler: { _ in
                self.startImex(what: DC_IMEX_IMPORT_SELF_KEYS)
            }))
            alert.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }))

        let locationStreaming = UserDefaults.standard.bool(forKey: "location_streaming")
        let title = locationStreaming ?
            "Disable on-demand location streaming" : String.localized("pref_on_demand_location_streaming")
        alert.addAction(UIAlertAction(title: title, style: .default, handler: { [weak self] _ in
            guard let self = self else { return }
            UserDefaults.standard.set(!locationStreaming, forKey: "location_streaming")
            if !locationStreaming {
                let alert = UIAlertController(title: "Thanks for trying out the experimental feature 🧪 \"Location streaming\"",
                                              message: "You will find a corresponding option in the attach menu (the paper clip) of each chat now.\n\n"
                                                + "If you want to quit the experimental feature, you can disable it at \"Settings / Advanced\".",
                                              preferredStyle: .alert)
                alert.addAction(UIAlertAction(title: String.localized("ok"), style: .default, handler: nil))
                self.navigationController?.present(alert, animated: true, completion: nil)
            } else if self.dcContext.isSendingLocationsToChat(chatId: 0) {
                guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
                    return
                }
                appDelegate.locationManager.disableLocationStreamingInAllChats()
            }
        }))

        let logAction = UIAlertAction(title: String.localized("pref_view_log"), style: .default, handler: { [weak self] _ in
            guard let self = self else { return }
            SettingsViewController.showDebugToolkit(dcContext: self.dcContext)
        })
        alert.addAction(logAction)
        alert.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel, handler: nil))
        present(alert, animated: true, completion: nil)
    }

    private func presentError(message: String) {
        let error = UIAlertController(title: nil, message: message, preferredStyle: .alert)
        error.addAction(UIAlertAction(title: String.localized("ok"), style: .cancel))
        present(error, animated: true)
    }

    private func showSwitchAccountMenu() {
        let accountIds = dcAccounts.getAll()
        let selectedAccountId = dcAccounts.getSelected().id
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }

        // switch account
        let menu = UIAlertController(title: String.localized("switch_account"), message: nil, preferredStyle: .safeActionSheet)
        for accountId in accountIds {
            let account = dcAccounts.get(id: accountId)
            var title = account.displaynameAndAddr
            title = (selectedAccountId==accountId ? "✔︎ " : "") + title
            menu.addAction(UIAlertAction(title: title, style: .default, handler: { [weak self] _ in
                guard let self = self else { return }
                _ = self.dcAccounts.select(id: accountId)
                appDelegate.reloadDcContext()
            }))
        }

        // add account
        menu.addAction(UIAlertAction(title: String.localized("add_account"), style: .default, handler: { [weak self] _ in
            guard let self = self else { return }
            _ = self.dcAccounts.add()
            appDelegate.reloadDcContext()
        }))

        // delete account
        menu.addAction(UIAlertAction(title: String.localized("delete_account"), style: .default, handler: { [weak self] _ in
            let confirm1 = UIAlertController(title: String.localized("delete_account_ask"), message: nil, preferredStyle: .safeActionSheet)
            confirm1.addAction(UIAlertAction(title: String.localized("delete_account"), style: .destructive, handler: { [weak self] _ in
                guard let self = self else { return }
                let account = self.dcAccounts.get(id: selectedAccountId)
                let confirm2 = UIAlertController(title: account.displaynameAndAddr,
                    message: String.localized("forget_login_confirmation_desktop"), preferredStyle: .alert)
                confirm2.addAction(UIAlertAction(title: String.localized("delete"), style: .destructive, handler: { [weak self] _ in
                    guard let self = self else { return }
                    appDelegate.locationManager.disableLocationStreamingInAllChats()
                    _ = self.dcAccounts.remove(id: selectedAccountId)
                    INInteraction.delete(with: "\(selectedAccountId)", completion: nil)
                    if self.dcAccounts.getAll().isEmpty {
                        _ = self.dcAccounts.add()
                    }
                    appDelegate.reloadDcContext()
                }))
                confirm2.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel))
                self.present(confirm2, animated: true, completion: nil)
            }))
            confirm1.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel))
            self?.present(confirm1, animated: true, completion: nil)
        }))

        menu.addAction(UIAlertAction(title: String.localized("cancel"), style: .cancel, handler: nil))
        present(menu, animated: true, completion: nil)
    }

    private func startImex(what: Int32) {
        let documents = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        if !documents.isEmpty {
            showProgressAlert(title: String.localized("imex_progress_title_desktop"), dcContext: dcContext)
            DispatchQueue.main.async {
                self.dcAccounts.stopIo()
                self.dcContext.imex(what: what, directory: documents[0])
            }
        } else {
            logger.error("document directory not found")
        }
    }

    // MARK: - updates
    private func updateCells() {
        profileCell.updateCell(cellViewModel: ProfileViewModel(context: dcContext))
        showEmailsCell.detailTextLabel?.text = SettingsClassicViewController.getValString(val: dcContext.showEmails)
        mediaQualityCell.detailTextLabel?.text = MediaQualityController.getValString(val: dcContext.getConfigInt("media_quality"))
        videoChatInstanceCell.detailTextLabel?.text = dcContext.getConfig("webrtc_instance")
        autodelCell.detailTextLabel?.text = autodelSummary()
        connectivityCell.detailTextLabel?.text = DcUtils.getConnectivityString(dcContext: dcContext,
                                                                               connectedString: String.localized("connectivity_connected"))
    }

    // MARK: - coordinator
    private func showEditSettingsController() {
        let editController = EditSettingsController(dcAccounts: dcAccounts)
        navigationController?.pushViewController(editController, animated: true)
    }

    private func showClassicMail() {
        let settingsClassicViewController = SettingsClassicViewController(dcContext: dcContext)
        navigationController?.pushViewController(settingsClassicViewController, animated: true)
    }

    private func  showMediaQuality() {
        let mediaQualityController = MediaQualityController(dcContext: dcContext)
        navigationController?.pushViewController(mediaQualityController, animated: true)
    }

    private func showVideoChatInstance() {
        let videoInstanceController = SettingsVideoChatViewController(dcContext: dcContext)
        navigationController?.pushViewController(videoInstanceController, animated: true)
    }

    private func showArchivedCharts() {
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        appDelegate.appCoordinator.showArchivedChats()
    }

    private func showBlockedContacts() {
        let blockedContactsController = BlockedContactsViewController(dcContext: dcContext)
        navigationController?.pushViewController(blockedContactsController, animated: true)
    }

    private func showAutodelOptions() {
        let settingsAutodelOverviewController = SettingsAutodelOverviewController(dcContext: dcContext)
        navigationController?.pushViewController(settingsAutodelOverviewController, animated: true)
    }

    private func showHelp() {
        navigationController?.pushViewController(HelpViewController(), animated: true)
    }

    private func showConnectivity() {
        navigationController?.pushViewController(ConnectivityViewController(dcContext: dcContext), animated: true)
    }

    public static func showDebugToolkit(dcContext: DcContext) {
        var info = ""

        let systemVersion = UIDevice.current.systemVersion
        info += "iosVersion=\(systemVersion)\n"

        let notifyEnabled = !UserDefaults.standard.bool(forKey: "notifications_disabled")
        info += "notify-enabled=\(notifyEnabled)\n"

        if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
            info += "notify-token=\(appDelegate.notifyToken ?? "<unset>")\n"
        }

        for name in ["notify-remote-launch", "notify-remote-receive", "notify-local-wakeup"] {
            let cnt = UserDefaults.standard.integer(forKey: name + "-count")

            let startDbl = UserDefaults.standard.double(forKey: name + "-start")
            let startStr = startDbl==0.0 ? "" : " since " + DateUtils.getExtendedRelativeTimeSpanString(timeStamp: startDbl)

            let timestampDbl = UserDefaults.standard.double(forKey: name + "-last")
            let timestampStr = timestampDbl==0.0 ? "" : ", last " + DateUtils.getExtendedRelativeTimeSpanString(timeStamp: timestampDbl)

            info += "\(name)=\(cnt)x\(startStr)\(timestampStr)\n"
        }

        var val = "?"
        switch UIApplication.shared.backgroundRefreshStatus {
        case .restricted: val = "restricted"
        case .available: val = "available"
        case .denied: val = "denied"
        }
        info += "backgroundRefreshStatus=\(val)\n"

        #if DEBUG
        info += "DEBUG=1\n"
        #else
        info += "DEBUG=0\n"
        #endif

        info += "\n" + dcContext.getInfo()

        DBDebugToolkit.add(DBCustomVariable(name: "", value: info))
        DBDebugToolkit.showMenu()
    }
}