import UIKit

class SecuritySettingsController: UITableViewController {

    private var options: [String]
    private var selectedIndex: Int {
        didSet {
            print(selectedIndex)
        }
    }

    private var backupIndex: Int

    var onDismiss: ((String) -> Void)?

    private var resetButton: UIBarButtonItem!

    private var staticCells: [UITableViewCell] {
        return options.map {
            let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
            cell.textLabel?.text = $0
            cell.selectionStyle = .none
            return cell
        }
    }

    init(title: String, options: [String], selectedOption: String) {
        self.options = options
        selectedIndex = options.index(of: selectedOption)!
        backupIndex = selectedIndex
        super.init(style: .grouped)
        self.title = title
    }

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

    override func viewDidLoad() {
        super.viewDidLoad()
        resetButton = UIBarButtonItem(title: String.localized("reset"), style: .done, target: self, action: #selector(resetButtonPressed))
        resetButton.isEnabled = false
        navigationItem.rightBarButtonItem = resetButton
    }

    override func viewWillDisappear(_ animated: Bool) {
        let selectedOption = options[selectedIndex]
        onDismiss?(selectedOption)
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return options.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = staticCells[indexPath.row]
        if selectedIndex == indexPath.row {
            cell.accessoryType = .checkmark
        } else {
            cell.accessoryType = .none
        }
        return cell
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        // uselect old
        if let cell = tableView.cellForRow(at: IndexPath(item: selectedIndex, section: 0)) {
            cell.accessoryType = .none
        }
        // select new
        if let cell = tableView.cellForRow(at: indexPath) {
            cell.accessoryType = .checkmark
        }
        selectedIndex = indexPath.row
        resetButton.isEnabled = true
    }

    @objc func resetButtonPressed() {
        selectedIndex = backupIndex
        tableView.reloadData()
    }

}


enum SecurityType {
    case IMAPSecurity
    case SMTPSecurity
}

enum SecurityValue: String {
    case AUTO = "Automatic"
    case TLS = "SSL / TLS"
    case STARTTLS = "STARTTLS"
    case PLAIN = "OFF"
}

class SecurityConverter {

    static func convertValueToInt(type: SecurityType, value: SecurityValue) -> Int {
        switch type {
        case .IMAPSecurity:
            switch value {
            case .AUTO:
                return 0x000
            case .STARTTLS:
                return 0x100
            case .TLS:
                return 0x200
            case .PLAIN:
                return 0x400
            }
        case .SMTPSecurity:
            switch value {
            case .AUTO:
                return 0x00000
            case .STARTTLS:
                return 0x10000
            case .TLS:
                return 0x20000
            case .PLAIN:
                return 0x40000
            }
        }
    }

    // TODO: discuss if we want to internationalize OFF and Automatic
    static func convertHexToString(type: SecurityType, hex value: Int) -> String {
        switch type {
        case .IMAPSecurity:
            switch value {
            case 0x00:
                return "Automatic"
            case 0x100:
                return "STARTTLS"
            case 0x200:
                return "SSL / TLS"
            case  0x400:
                return "OFF"
            default:
                return "Undefined"
            }
        case .SMTPSecurity:
            switch value {
            case 0x00000:
                return "Automatic"
            case 0x10000:
                return "STARTTLS"
            case 0x20000:
                return "SSL / TLS"
            case  0x40000:
                return "OFF"
            default:
                return "Undefined"
            }
        }
    }
}