SideStore/AltStore/Settings/SettingsViewController.swift

//
//  SettingsViewController.swift
//  AltStore
//
//  Created by Riley Testut on 8/31/19.
//  Copyright © 2019 Riley Testut. All rights reserved.
//

import UIKit
import SafariServices
import MessageUI
import Intents
import IntentsUI

import AltStoreCore

extension SettingsViewController
{
    fileprivate enum Section: Int, CaseIterable
    {
        case signIn
        case account
        case patreon
        case appRefresh
        case instructions
        case credits
        case debug
    }
    
    fileprivate enum AppRefreshRow: Int, CaseIterable
    {
        case backgroundRefresh
        case noIdleTimeout
        
        @available(iOS 14, *)
        case addToSiri
        
        static var allCases: [AppRefreshRow] {
            guard #available(iOS 14, *) else { return [.backgroundRefresh, .noIdleTimeout] }
            return [.backgroundRefresh, .noIdleTimeout, .addToSiri]
        }
    }
    
    fileprivate enum CreditsRow: Int, CaseIterable
    {
        case developer
        case operations
        case designer
        case softwareLicenses
    }
    
    fileprivate enum DebugRow: Int, CaseIterable
    {
        case sendFeedback
        case refreshAttempts
        case errorLog
        case refreshSideJITServer
        case clearCache
        case resetPairingFile
        case resetAdiPb
        case advancedSettings
    
    }
}

final class SettingsViewController: UITableViewController
{
    private var activeTeam: Team?
    
    private var prototypeHeaderFooterView: SettingsHeaderFooterView!
    
    private var debugGestureCounter = 0
    private weak var debugGestureTimer: Timer?
    
    @IBOutlet private var accountNameLabel: UILabel!
    @IBOutlet private var accountEmailLabel: UILabel!
    @IBOutlet private var accountTypeLabel: UILabel!
    
    @IBOutlet private var backgroundRefreshSwitch: UISwitch!
    @IBOutlet private var noIdleTimeoutSwitch: UISwitch!
    
    @IBOutlet private var refreshSideJITServer: UILabel!
    
    @IBOutlet private var versionLabel: UILabel!
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    required init?(coder aDecoder: NSCoder)
    {
        super.init(coder: aDecoder)
        
        NotificationCenter.default.addObserver(self, selector: #selector(SettingsViewController.openPatreonSettings(_:)), name: AppDelegate.openPatreonSettingsDeepLinkNotification, object: nil)
    }
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        let nib = UINib(nibName: "SettingsHeaderFooterView", bundle: nil)
        self.prototypeHeaderFooterView = nib.instantiate(withOwner: nil, options: nil)[0] as? SettingsHeaderFooterView
        
        self.tableView.register(nib, forHeaderFooterViewReuseIdentifier: "HeaderFooterView")
        
        let debugModeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(SettingsViewController.handleDebugModeGesture(_:)))
        debugModeGestureRecognizer.delegate = self
        debugModeGestureRecognizer.direction = .up
        debugModeGestureRecognizer.numberOfTouchesRequired = 3
        self.tableView.addGestureRecognizer(debugModeGestureRecognizer)
        
        print(Bundle.main.infoDictionary)
        var versionString: String = ""
        if let version = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
        {
            versionString += "SideStore \(version)"
            if let xcode = Bundle.main.object(forInfoDictionaryKey: "DTXcode") as? String {
                print(xcode)
                versionString += " - Xcode \(xcode) - "
                if let build = Bundle.main.object(forInfoDictionaryKey: "DTXcodeBuild") as? String {
                    print(build)
                    versionString += "\(build)"
                }
            }
            if let pairing = Bundle.main.object(forInfoDictionaryKey: "ALTPairingFile") as? String {
                let pair_test = pairing == "<insert pairing file here>"
                if !pair_test {
                    versionString += " - \(!pair_test)"
                }
            }
        }
        else
        {
            versionString += "SideStore\t"
        }
        self.versionLabel.text = NSLocalizedString(versionString, comment: "SideStore Version")

        self.tableView.contentInset.bottom = 40
        
        self.update()
        
        if #available(iOS 15, *), let appearance = self.tabBarController?.tabBar.standardAppearance
        {
            appearance.stackedLayoutAppearance.normal.badgeBackgroundColor = .altPrimary
            self.navigationController?.tabBarItem.scrollEdgeAppearance = appearance
        }
    }
    
    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated)
        
        self.update()
    }
}

private extension SettingsViewController
{
    func update()
    {
        if let team = DatabaseManager.shared.activeTeam()
        {
            self.accountNameLabel.text = team.name
            self.accountEmailLabel.text = team.account.appleID
            self.accountTypeLabel.text = team.type.localizedDescription
            
            self.activeTeam = team
        }
        else
        {
            self.activeTeam = nil
        }
        
        self.backgroundRefreshSwitch.isOn = UserDefaults.standard.isBackgroundRefreshEnabled
        self.noIdleTimeoutSwitch.isOn = UserDefaults.standard.isIdleTimeoutDisableEnabled
        
        if self.isViewLoaded
        {
            self.tableView.reloadData()
        }
    }
    
    func prepare(_ settingsHeaderFooterView: SettingsHeaderFooterView, for section: Section, isHeader: Bool)
    {
        settingsHeaderFooterView.primaryLabel.isHidden = !isHeader
        settingsHeaderFooterView.secondaryLabel.isHidden = isHeader
        settingsHeaderFooterView.button.isHidden = true
        
        settingsHeaderFooterView.layoutMargins.bottom = isHeader ? 0 : 8
        
        switch section
        {
        case .signIn:
            if isHeader
            {
                settingsHeaderFooterView.primaryLabel.text = NSLocalizedString("ACCOUNT", comment: "")
            }
            else
            {
                settingsHeaderFooterView.secondaryLabel.text = NSLocalizedString("Sign in with your Apple ID to download apps from SideStore.", comment: "")
            }
            
        case .patreon:
            if isHeader
            {
                settingsHeaderFooterView.primaryLabel.text = NSLocalizedString("SUPPORT US", comment: "")
            }
            else
            {
                settingsHeaderFooterView.secondaryLabel.text = NSLocalizedString("Support the SideStore Team by following our socials or becoming a patron!", comment: "")
            }

        case .account:
            settingsHeaderFooterView.primaryLabel.text = NSLocalizedString("ACCOUNT", comment: "")
            
            settingsHeaderFooterView.button.setTitle(NSLocalizedString("SIGN OUT", comment: ""), for: .normal)
            settingsHeaderFooterView.button.addTarget(self, action: #selector(SettingsViewController.signOut(_:)), for: .primaryActionTriggered)
            settingsHeaderFooterView.button.isHidden = false
            
        case .appRefresh:
            if isHeader
            {
                settingsHeaderFooterView.primaryLabel.text = NSLocalizedString("REFRESHING APPS", comment: "")
            }
            else
            {
                settingsHeaderFooterView.secondaryLabel.text = NSLocalizedString("Enable Background Refresh to automatically refresh apps in the background when connected to Wi-Fi. \n\nDisable the Idle Timeout toggle to allow SideStore to not let your device go to sleep during a refresh or install of any apps.", comment: "")
            }
            
        case .instructions:
            break
            
        case .credits:
            settingsHeaderFooterView.primaryLabel.text = NSLocalizedString("CREDITS", comment: "")
            
        case .debug:
            settingsHeaderFooterView.primaryLabel.text = NSLocalizedString("DEBUG", comment: "")
        }
    }
    
    func preferredHeight(for settingsHeaderFooterView: SettingsHeaderFooterView, in section: Section, isHeader: Bool) -> CGFloat
    {
        let widthConstraint = settingsHeaderFooterView.contentView.widthAnchor.constraint(equalToConstant: tableView.bounds.width)
        NSLayoutConstraint.activate([widthConstraint])
        defer { NSLayoutConstraint.deactivate([widthConstraint]) }
        
        self.prepare(settingsHeaderFooterView, for: section, isHeader: isHeader)
        
        let size = settingsHeaderFooterView.contentView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
        return size.height
    }
}

private extension SettingsViewController
{
    func signIn()
    {
        AppManager.shared.authenticate(presentingViewController: self) { (result) in
            DispatchQueue.main.async {
                switch result
                {
                case .failure(OperationError.cancelled):
                    // Ignore
                    break
                    
                case .failure(let error):
                    let toastView = ToastView(error: error)
                    toastView.show(in: self)
                    
                case .success: break
                }
                
                self.update()
            }
        }
    }
    
    @objc func signOut(_ sender: UIBarButtonItem)
    {
        func signOut()
        {
            DatabaseManager.shared.signOut { (error) in
                DispatchQueue.main.async {
                    if let error = error
                    {
                        let toastView = ToastView(error: error)
                        toastView.show(in: self)
                    }
                    
                    self.update()
                }
            }
        }
        
        let alertController = UIAlertController(title: NSLocalizedString("Are you sure you want to sign out?", comment: ""), message: NSLocalizedString("You will no longer be able to install or refresh apps once you sign out.", comment: ""), preferredStyle: .actionSheet)
        alertController.addAction(UIAlertAction(title: NSLocalizedString("Sign Out", comment: ""), style: .destructive) { _ in signOut() })
        alertController.addAction(.cancel)
        //Fix crash on iPad
        alertController.popoverPresentationController?.barButtonItem = sender
        self.present(alertController, animated: true, completion: nil)
    }
    
    @IBAction func toggleIsBackgroundRefreshEnabled(_ sender: UISwitch)
    {
        UserDefaults.standard.isBackgroundRefreshEnabled = sender.isOn
    }
    
    @IBAction func toggleNoIdleTimeoutEnabled(_ sender: UISwitch)
    {
        UserDefaults.standard.isIdleTimeoutDisableEnabled = sender.isOn
    }
    
    @available(iOS 14, *)
    @IBAction func addRefreshAppsShortcut()
    {
        guard let shortcut = INShortcut(intent: INInteraction.refreshAllApps().intent) else { return }
        
        let viewController = INUIAddVoiceShortcutViewController(shortcut: shortcut)
        viewController.delegate = self
        viewController.modalPresentationStyle = .formSheet
        self.present(viewController, animated: true, completion: nil)
    }
    
    func clearCache()
    {
        let alertController = UIAlertController(title: NSLocalizedString("Are you sure you want to clear SideStore's cache?", comment: ""),
                                                message: NSLocalizedString("This will remove all temporary files as well as backups for uninstalled apps.", comment: ""),
                                                preferredStyle: .actionSheet)
        alertController.addAction(UIAlertAction(title: UIAlertAction.cancel.title, style: UIAlertAction.cancel.style) { [weak self] _ in
            self?.tableView.indexPathForSelectedRow.map { self?.tableView.deselectRow(at: $0, animated: true) }
        })
        alertController.addAction(UIAlertAction(title: NSLocalizedString("Clear Cache", comment: ""), style: .destructive) { [weak self] _ in
            AppManager.shared.clearAppCache { result in
                DispatchQueue.main.async {
                    self?.tableView.indexPathForSelectedRow.map { self?.tableView.deselectRow(at: $0, animated: true) }
                    
                    switch result
                    {
                    case .success: break
                    case .failure(let error):
                        let alertController = UIAlertController(title: NSLocalizedString("Unable to Clear Cache", comment: ""), message: error.localizedDescription, preferredStyle: .alert)
                        alertController.addAction(.ok)
                        self?.present(alertController, animated: true)
                    }
                }
            }
        })
        
        if let popoverController = alertController.popoverPresentationController {
            popoverController.sourceView = self.view
            popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
        }
        
        self.present(alertController, animated: true)
    }
    
    @IBAction func handleDebugModeGesture(_ gestureRecognizer: UISwipeGestureRecognizer)
    {
        self.debugGestureCounter += 1
        self.debugGestureTimer?.invalidate()
        
        if self.debugGestureCounter >= 3
        {
            self.debugGestureCounter = 0
            
            UserDefaults.standard.isDebugModeEnabled.toggle()
            self.tableView.reloadData()
        }
        else
        {
            self.debugGestureTimer = Timer.scheduledTimer(withTimeInterval: 0.4, repeats: false) { [weak self] (timer) in
                self?.debugGestureCounter = 0
            }
        }
    }
    
    func openTwitter(username: String)
    {
        let twitterAppURL = URL(string: "twitter://user?screen_name=" + username)!
        UIApplication.shared.open(twitterAppURL, options: [:]) { (success) in
            if success
            {
                if let selectedIndexPath = self.tableView.indexPathForSelectedRow
                {
                    self.tableView.deselectRow(at: selectedIndexPath, animated: true)
                }
            }
            else
            {
                let safariURL = URL(string: "https://twitter.com/" + username)!
                
                let safariViewController = SFSafariViewController(url: safariURL)
                safariViewController.preferredControlTintColor = .altPrimary
                self.present(safariViewController, animated: true, completion: nil)
            }
        }
    }
}

private extension SettingsViewController
{
    @objc func openPatreonSettings(_ notification: Notification)
    {
        guard self.presentedViewController == nil else { return }
                
        UIView.performWithoutAnimation {
            self.navigationController?.popViewController(animated: false)
            self.performSegue(withIdentifier: "showPatreon", sender: nil)
        }
    }
}

extension SettingsViewController
{
    override func numberOfSections(in tableView: UITableView) -> Int
    {
        var numberOfSections = super.numberOfSections(in: tableView)
        
        if !UserDefaults.standard.isDebugModeEnabled
        {
            numberOfSections -= 1
        }
        
        return numberOfSections
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        let section = Section.allCases[section]
        switch section
        {
        case .signIn: return (self.activeTeam == nil) ? 1 : 0
        case .account: return (self.activeTeam == nil) ? 0 : 3
        case .appRefresh: return AppRefreshRow.allCases.count
        default: return super.tableView(tableView, numberOfRowsInSection: section.rawValue)
        }
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell = super.tableView(tableView, cellForRowAt: indexPath)
        
//        if #available(iOS 14, *) {}
//        else if let cell = cell as? InsetGroupTableViewCell,
//                indexPath.section == Section.appRefresh.rawValue,
//                indexPath.row == AppRefreshRow.backgroundRefresh.rawValue
//        {
//            // Only one row is visible pre-iOS 14.
//            cell.style = .single
//        }
        
        if AppRefreshRow.AllCases().count == 1
        {
            if let cell = cell as? InsetGroupTableViewCell,
               indexPath.section == Section.appRefresh.rawValue,
               indexPath.row == AppRefreshRow.backgroundRefresh.rawValue
            {
                cell.style = .single
            }
        }
        
        
        return cell
    }
    
    override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?
    {
        let section = Section.allCases[section]
        switch section
        {
        case .signIn where self.activeTeam != nil: return nil
        case .account where self.activeTeam == nil: return nil
        case .signIn, .account, .patreon, .appRefresh, .credits, .debug:
            let headerView = tableView.dequeueReusableHeaderFooterView(withIdentifier: "HeaderFooterView") as! SettingsHeaderFooterView
            self.prepare(headerView, for: section, isHeader: true)
            return headerView
            
        case .instructions: return nil
        }
    }
    
    override func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView?
    {
        let section = Section.allCases[section]
        switch section
        {
        case .signIn where self.activeTeam != nil: return nil
        case .signIn, .patreon, .appRefresh:
            let footerView = tableView.dequeueReusableHeaderFooterView(withIdentifier: "HeaderFooterView") as! SettingsHeaderFooterView
            self.prepare(footerView, for: section, isHeader: false)
            return footerView
            
        case .account, .credits, .debug, .instructions: return nil
        }
    }

    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
    {
        let section = Section.allCases[section]
        switch section
        {
        case .signIn where self.activeTeam != nil: return 1.0
        case .account where self.activeTeam == nil: return 1.0
        case .signIn, .account, .patreon, .appRefresh, .credits, .debug:
            let height = self.preferredHeight(for: self.prototypeHeaderFooterView, in: section, isHeader: true)
            return height
            
        case .instructions: return 0.0
        }
    }
    
    override func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat
    {
        let section = Section.allCases[section]
        switch section
        {
        case .signIn where self.activeTeam != nil: return 1.0
        case .account where self.activeTeam == nil: return 1.0            
        case .signIn, .patreon, .appRefresh:
            let height = self.preferredHeight(for: self.prototypeHeaderFooterView, in: section, isHeader: false)
            return height
            
        case .account, .credits, .debug, .instructions: return 0.0
        }
    }
}

extension SettingsViewController
{
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
    {
        let section = Section.allCases[indexPath.section]
        switch section
        {
        case .signIn: self.signIn()
        case .instructions: break
        case .appRefresh:
            let row = AppRefreshRow.allCases[indexPath.row]
            switch row
            {
            case .backgroundRefresh: break
            case .noIdleTimeout: break
            case .addToSiri:
                guard #available(iOS 14, *) else { return }
                self.addRefreshAppsShortcut()
            }
            
            
        case .credits:
            let row = CreditsRow.allCases[indexPath.row]
            switch row
            {
            case .developer: self.openTwitter(username: "sidestore_io")
            case .operations: self.openTwitter(username: "sidestore_io")
            case .designer: self.openTwitter(username: "lit_ritt")
            case .softwareLicenses: break
            }
            
        case .debug:
            let row = DebugRow.allCases[indexPath.row]
            switch row
            {
            case .sendFeedback:
                if MFMailComposeViewController.canSendMail()
                {
                    let mailViewController = MFMailComposeViewController()
                    mailViewController.mailComposeDelegate = self
                    mailViewController.setToRecipients(["support@sidestore.io"])
                    
                    if let version = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
                    {
                        mailViewController.setSubject("SideStore Beta \(version) Feedback")
                    }
                    else
                    {
                        mailViewController.setSubject("SideStore Beta Feedback")
                    }
                    
                    self.present(mailViewController, animated: true, completion: nil)
                }
                else
                {
                    let toastView = ToastView(text: NSLocalizedString("Cannot Send Mail", comment: ""), detailText: nil)
                    toastView.show(in: self)
                }
                
            case .refreshSideJITServer:
                if #available(iOS 17, *) {
                   let alertController = UIAlertController(
                      title: NSLocalizedString("Are you sure to Refresh SideJITServer?", comment: ""),
                      message: NSLocalizedString("if you do not have SideJITServer setup this will do nothing", comment: ""),
                      preferredStyle: UIAlertController.Style.actionSheet)

                   alertController.addAction(UIAlertAction(title: NSLocalizedString("Refresh", comment: ""), style: .destructive){ _ in
                      if UserDefaults.standard.sidejitenable {
                         var SJSURL = ""
                          if (UserDefaults.standard.textInputSideJITServerurl ?? "").isEmpty {
                            SJSURL = "http://sidejitserver._http._tcp.local:8080"
                         } else {
                            SJSURL = UserDefaults.standard.textInputSideJITServerurl ?? ""
                         }  // replace with your URL
                        
                          
                         let url = URL(string: SJSURL + "/re/")!

                         let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
                            if let error = error {
                               print("Error: \(error)")
                            } else {
                               // Do nothing with data or response
                            }
                         }

                         task.resume()
                      }
                   })

                   alertController.addAction(.cancel)
                   //Fix crash on iPad
                   alertController.popoverPresentationController?.sourceView = self.tableView
                   alertController.popoverPresentationController?.sourceRect = self.tableView.rectForRow(at: indexPath)
                   self.present(alertController, animated: true)
                   self.tableView.deselectRow(at: indexPath, animated: true)
                } else {
                   let alertController = UIAlertController(
                      title: NSLocalizedString("You are not on iOS 17+ This will not work", comment: ""),
                      message: NSLocalizedString("This is meant for 'SideJITServer' and it only works on iOS 17+ ", comment: ""),
                      preferredStyle: UIAlertController.Style.actionSheet)

                   alertController.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .destructive){ _ in
                      print("Not on iOS 17")
                   })

                   alertController.addAction(.cancel)
                   //Fix crash on iPad
                   alertController.popoverPresentationController?.sourceView = self.tableView
                   alertController.popoverPresentationController?.sourceRect = self.tableView.rectForRow(at: indexPath)
                   self.present(alertController, animated: true)
                   self.tableView.deselectRow(at: indexPath, animated: true)
                }

                
            case .clearCache: self.clearCache()
                
            case .resetPairingFile:
                let filename = "ALTPairingFile.mobiledevicepairing"
                let fm = FileManager.default
                let documentsPath = fm.documentsDirectory.appendingPathComponent("/\(filename)")
                let alertController = UIAlertController(
                    title: NSLocalizedString("Are you sure to reset the pairing file?", comment: ""),
                    message: NSLocalizedString("You can reset the pairing file when you cannot sideload apps or enable JIT. You need to restart SideStore.", comment: ""),
                    preferredStyle: UIAlertController.Style.actionSheet)
                
                alertController.addAction(UIAlertAction(title: NSLocalizedString("Delete and Reset", comment: ""), style: .destructive){ _ in
                    if fm.fileExists(atPath: documentsPath.path), let contents = try? String(contentsOf: documentsPath), !contents.isEmpty {
                        UserDefaults.standard.isPairingReset = true
                        try? fm.removeItem(atPath: documentsPath.path)
                        NSLog("Pairing File Reseted")
                    }
                    self.tableView.deselectRow(at: indexPath, animated: true)
                    let dialogMessage = UIAlertController(title: NSLocalizedString("Pairing File Reset", comment: ""), message: NSLocalizedString("Please restart SideStore", comment: ""), preferredStyle: .alert)
                    self.present(dialogMessage, animated: true, completion: nil)
                })
                alertController.addAction(.cancel)
                //Fix crash on iPad
                alertController.popoverPresentationController?.sourceView = self.tableView
                alertController.popoverPresentationController?.sourceRect = self.tableView.rectForRow(at: indexPath)
                self.present(alertController, animated: true)
                self.tableView.deselectRow(at: indexPath, animated: true)
            case .resetAdiPb:
                let alertController = UIAlertController(
                    title: NSLocalizedString("Are you sure you want to reset the adi.pb file?", comment: ""),
                    message: NSLocalizedString("The adi.pb file is used to generate anisette data, which is required to log into an Apple ID. If you are having issues with account related things, you can try this. However, you will be required to do 2FA again. This will do nothing if you are using an older anisette server.", comment: ""),
                    preferredStyle: UIAlertController.Style.actionSheet)
                
                alertController.addAction(UIAlertAction(title: NSLocalizedString("Reset adi.pb", comment: ""), style: .destructive){ _ in
                    if Keychain.shared.adiPb != nil {
                        Keychain.shared.adiPb = nil
                        print("Cleared adi.pb from keychain")
                    }
                    self.tableView.deselectRow(at: indexPath, animated: true)
                })
                alertController.addAction(.cancel)
                //Fix crash on iPad
                alertController.popoverPresentationController?.sourceView = self.tableView
                alertController.popoverPresentationController?.sourceRect = self.tableView.rectForRow(at: indexPath)
                self.present(alertController, animated: true)
                self.tableView.deselectRow(at: indexPath, animated: true)
            case .advancedSettings:
                // Create the URL that deep links to your app's custom settings.
                if let url = URL(string: UIApplication.openSettingsURLString) {
                    // Ask the system to open that URL.
                    UIApplication.shared.open(url)
                } else {
                    ELOG("UIApplication.openSettingsURLString invalid")
                }
            case .refreshAttempts, .errorLog: break

            }
            
        default: break
        }
    }
}

extension SettingsViewController: MFMailComposeViewControllerDelegate
{
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?)
    {
        if let error = error
        {
            let toastView = ToastView(error: error)
            toastView.show(in: self)
        }
        
        controller.dismiss(animated: true, completion: nil)
    }
}

extension SettingsViewController: UIGestureRecognizerDelegate
{
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool
    {
        return true
    }
}

extension SettingsViewController: INUIAddVoiceShortcutViewControllerDelegate
{
    func addVoiceShortcutViewController(_ controller: INUIAddVoiceShortcutViewController, didFinishWith voiceShortcut: INVoiceShortcut?, error: Error?)
    {
        if let indexPath = self.tableView.indexPathForSelectedRow
        {
            self.tableView.deselectRow(at: indexPath, animated: true)
        }
        
        controller.dismiss(animated: true, completion: nil)
        
        guard let error = error else { return }
        
        let toastView = ToastView(error: error)
        toastView.show(in: self)
    }
    
    func addVoiceShortcutViewControllerDidCancel(_ controller: INUIAddVoiceShortcutViewController)
    {
        if let indexPath = self.tableView.indexPathForSelectedRow
        {
            self.tableView.deselectRow(at: indexPath, animated: true)
        }
        
        controller.dismiss(animated: true, completion: nil)
    }
}