final class JoinOpenGroupModal : Modal {
    private let name: String
    private let url: String
    
    // MARK: Lifecycle
    init(name: String, url: String) {
        self.name = name
        self.url = url
        super.init(nibName: nil, bundle: nil)
    }
    
    override init(nibName: String?, bundle: Bundle?) {
        preconditionFailure("Use init(name:url:) instead.")
    }
    
    required init?(coder: NSCoder) {
        preconditionFailure("Use init(name:url:) instead.")
    }
    
    override func populateContentView() {
        // Title
        let titleLabel = UILabel()
        titleLabel.textColor = Colors.text
        titleLabel.font = .boldSystemFont(ofSize: Values.largeFontSize)
        titleLabel.text = "Join \(name)?"
        titleLabel.textAlignment = .center
        // Message
        let messageLabel = UILabel()
        messageLabel.textColor = Colors.text
        messageLabel.font = .systemFont(ofSize: Values.smallFontSize)
        let message = "Are you sure you want to join the \(name) open group?";
        let attributedMessage = NSMutableAttributedString(string: message)
        attributedMessage.addAttributes([ .font : UIFont.boldSystemFont(ofSize: Values.smallFontSize) ], range: (message as NSString).range(of: name))
        messageLabel.attributedText = attributedMessage
        messageLabel.numberOfLines = 0
        messageLabel.lineBreakMode = .byWordWrapping
        messageLabel.textAlignment = .center
        // Join button
        let joinButton = UIButton()
        joinButton.set(.height, to: Values.mediumButtonHeight)
        joinButton.layer.cornerRadius = Modal.buttonCornerRadius
        joinButton.backgroundColor = Colors.buttonBackground
        joinButton.titleLabel!.font = .systemFont(ofSize: Values.smallFontSize)
        joinButton.setTitleColor(Colors.text, for: UIControl.State.normal)
        joinButton.setTitle("Join", for: UIControl.State.normal)
        joinButton.addTarget(self, action: #selector(joinOpenGroup), for: UIControl.Event.touchUpInside)
        // Button stack view
        let buttonStackView = UIStackView(arrangedSubviews: [ cancelButton, joinButton ])
        buttonStackView.axis = .horizontal
        buttonStackView.spacing = Values.mediumSpacing
        buttonStackView.distribution = .fillEqually
        // Main stack view
        let mainStackView = UIStackView(arrangedSubviews: [ titleLabel, messageLabel, buttonStackView ])
        mainStackView.axis = .vertical
        mainStackView.spacing = Values.largeSpacing
        contentView.addSubview(mainStackView)
        mainStackView.pin(.leading, to: .leading, of: contentView, withInset: Values.largeSpacing)
        mainStackView.pin(.top, to: .top, of: contentView, withInset: Values.largeSpacing)
        contentView.pin(.trailing, to: .trailing, of: mainStackView, withInset: Values.largeSpacing)
        contentView.pin(.bottom, to: .bottom, of: mainStackView, withInset: Values.largeSpacing)
    }
    
    // MARK: Interaction
    @objc private func joinOpenGroup() {
        guard let (room, server, publicKey) = OpenGroupManagerV2.parseV2OpenGroup(from: url), Features.useV2OpenGroups else {
            let alert = UIAlertController(title: "Couldn't Join", message: nil, preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .default, handler: nil))
            return presentingViewController!.present(alert, animated: true, completion: nil)
        }
        presentingViewController!.dismiss(animated: true, completion: nil)
        Storage.shared.write { [presentingViewController = self.presentingViewController!] transaction in
            OpenGroupManagerV2.shared.add(room: room, server: server, publicKey: publicKey, using: transaction)
            .done(on: DispatchQueue.main) { _ in
                let appDelegate = UIApplication.shared.delegate as! AppDelegate
                appDelegate.forceSyncConfigurationNowIfNeeded().retainUntilComplete() // FIXME: It's probably cleaner to do this inside addOpenGroup(...)
            }
            .catch(on: DispatchQueue.main) { error in
                let alert = UIAlertController(title: "Couldn't Join", message: error.localizedDescription, preferredStyle: .alert)
                alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .default, handler: nil))
                presentingViewController.present(alert, animated: true, completion: nil)
            }
        }
    }
}