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//
// CustomDNSCellFactory.swift
// MullvadVPN
//
// Created by Jon Petersson on 2023-11-09.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import MullvadSettings
import UIKit
protocol CustomDNSCellEventHandler {
func addDNSEntry()
func didChangeDNSEntry(with identifier: UUID, inputString: String) -> Bool
func didChangeState(for preference: CustomDNSDataSource.Item, isOn: Bool)
func showInfo(for button: VPNSettingsInfoButtonItem)
}
@MainActor
final class CustomDNSCellFactory: @preconcurrency CellFactoryProtocol {
let tableView: UITableView
var viewModel: VPNSettingsViewModel
var delegate: CustomDNSCellEventHandler?
var isEditing = false
init(tableView: UITableView, viewModel: VPNSettingsViewModel) {
self.tableView = tableView
self.viewModel = viewModel
}
func makeCell(for item: CustomDNSDataSource.Item, indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: item.reuseIdentifier.rawValue, for: indexPath)
configureCell(cell, item: item, indexPath: indexPath)
return cell
}
func configure(
_ cell: UITableViewCell,
toggleSetting: Bool,
title: String,
for preference: CustomDNSDataSource.Item
) {
guard let cell = cell as? SettingsSwitchCell else { return }
cell.titleLabel.text = title
cell.setAccessibilityIdentifier(preference.accessibilityIdentifier)
cell.applySubCellStyling()
cell.setOn(toggleSetting, animated: true)
cell.action = { [weak self] isOn in
self?.delegate?.didChangeState(
for: preference,
isOn: isOn
)
}
}
func configureCell(_ cell: UITableViewCell, item: CustomDNSDataSource.Item, indexPath: IndexPath) {
switch item {
case .blockAll:
let localizedString = NSLocalizedString("All", comment: "")
configure(
cell,
toggleSetting: viewModel.blockAll,
title: localizedString,
for: .blockAll
)
case .blockAdvertising:
let localizedString = NSLocalizedString("Ads", comment: "")
configure(
cell,
toggleSetting: viewModel.blockAdvertising,
title: localizedString,
for: .blockAdvertising
)
case .blockTracking:
let localizedString = NSLocalizedString("Trackers", comment: "")
configure(
cell,
toggleSetting: viewModel.blockTracking,
title: localizedString,
for: .blockTracking
)
case .blockMalware:
guard let cell = cell as? SettingsSwitchCell else { return }
let localizedString = NSLocalizedString("Malware", comment: "")
configure(
cell,
toggleSetting: viewModel.blockMalware,
title: localizedString,
for: .blockMalware
)
cell.infoButtonHandler = { [weak self] in
self?.delegate?.showInfo(for: .blockMalware)
}
case .blockAdultContent:
let localizedString = NSLocalizedString("Adult content", comment: "")
configure(
cell,
toggleSetting: viewModel.blockAdultContent,
title: localizedString,
for: .blockAdultContent
)
case .blockGambling:
let localizedString = NSLocalizedString("Gambling", comment: "")
configure(
cell,
toggleSetting: viewModel.blockGambling,
title: localizedString,
for: .blockGambling
)
case .blockSocialMedia:
let localizedString = NSLocalizedString("Social media", comment: "")
configure(
cell,
toggleSetting: viewModel.blockSocialMedia,
title: localizedString,
for: .blockSocialMedia
)
case .useCustomDNS:
guard let cell = cell as? SettingsSwitchCell else { return }
cell.titleLabel.text = NSLocalizedString("Use custom DNS server", comment: "")
cell.setSwitchEnabled(viewModel.customDNSPrecondition == .satisfied)
cell.setOn(viewModel.effectiveEnableCustomDNS, animated: false)
cell.accessibilityHint = viewModel.customDNSPrecondition
.localizedDescription(isEditing: isEditing)
cell.setAccessibilityIdentifier(.dnsSettingsUseCustomDNSCell)
cell.action = { [weak self] isOn in
self?.delegate?.didChangeState(for: .useCustomDNS, isOn: isOn)
}
cell.backgroundView?.backgroundColor = UIColor.Cell.Background.normal
case .addDNSServer:
guard let cell = cell as? SettingsAddDNSEntryCell else { return }
cell.titleLabel.text = NSLocalizedString("Add a server", comment: "")
cell.setAccessibilityIdentifier(.dnsSettingsAddServerCell)
cell.tapAction = { [weak self] in
self?.delegate?.addDNSEntry()
}
case let .dnsServer(entryIdentifier):
guard let cell = cell as? SettingsDNSTextCell else { return }
let dnsServerEntry = viewModel.dnsEntry(entryIdentifier: entryIdentifier)!
cell.textField.text = dnsServerEntry.address
cell.isValidInput = dnsEntryIsValid(identifier: entryIdentifier, cell: cell)
cell.accessibilityIdentifier = "\(item.accessibilityIdentifier) (\(entryIdentifier))"
cell.onTextChange = { [weak self] cell in
cell.isValidInput =
self?
.dnsEntryIsValid(identifier: entryIdentifier, cell: cell) ?? false
}
cell.onReturnKey = { cell in
cell.endEditing(false)
}
case .dnsServerInfo:
guard let cell = cell as? SettingsDNSInfoCell else { return }
cell.titleLabel.attributedText = viewModel.customDNSPrecondition.attributedLocalizedDescription(
isEditing: isEditing,
preferredFont: .mullvadTiny
)
}
}
private func dnsEntryIsValid(identifier: UUID, cell: SettingsDNSTextCell) -> Bool {
delegate?.didChangeDNSEntry(
with: identifier,
inputString: cell.textField.text ?? ""
) ?? false
}
}
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