/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This file contains the ProxyServerAddEditController class, which controls a view used to create or edit a proxy server configuration.

*/

import UIKit

import NetworkExtension

/// A view controller object for a view that contains input fields used to define HTTP proxy server settings.

class ProxyServerAddEditController: ConfigurationParametersViewController {

    // MARK: Properties

    /// A table view cell containing a text input field where the user enters the proxy server address.

    @IBOutlet weak var addressCell: TextFieldCell!

    /// A table view cell containing a text input field where the user enters the proxy server port number.

    @IBOutlet weak var portCell: TextFieldCell!

    /// A table view cell containing a text input field where the user enters the username portion of the proxy credential.

    @IBOutlet weak var usernameCell: TextFieldCell!

    /// A table view cell containing a text input field where the user enters the password portion of the proxy credential.

    @IBOutlet weak var passwordCell: TextFieldCell!

    /// A table view cell containing a switch that toggles authentication for the proxy server.

    @IBOutlet weak var authenticationSwitchCell: SwitchCell!

    /// The NEProxyServer object containing the proxy server settings.

    var targetServer = NEProxyServer(address: "", port: 0)

    /// The block to call when the user taps on the "Done" button.

    var saveChangesCallback: (NEProxyServer) -> Void = { server in return }

    // MARK: UIViewController

    /// Handle the event where the view is loaded into memory.

    override func viewDidLoad() {

        super.viewDidLoad()

        cells = [

            addressCell,

            portCell,

            authenticationSwitchCell

        ].flatMap { $0 }

        authenticationSwitchCell.dependentCells = [ usernameCell, passwordCell ]

        authenticationSwitchCell.getIndexPath = {

            return self.getIndexPathOfCell(self.authenticationSwitchCell)

        }

        authenticationSwitchCell.valueChanged = {

            self.updateCellsWithDependentsOfCell(self.authenticationSwitchCell)

            self.targetServer.authenticationRequired = self.authenticationSwitchCell.isOn

        }

    }

    /// Handle the event when the view is being displayed.

    override func viewWillAppear(_ animated: Bool) {

        super.viewWillAppear(animated)

        tableView.reloadData()

        addressCell.textField.text = !targetServer.address.isEmpty ? targetServer.address : nil

        portCell.textField.text = targetServer.port > 0 ? String(targetServer.port) : nil

        passwordCell.textField.text = targetServer.password

        usernameCell.textField.text = targetServer.username

        authenticationSwitchCell.isOn = targetServer.authenticationRequired

    }

    // MARK: Interface

    /// Set the NEProxyServer object to modify, the title of the view, and a block to call when the user is done modify the proxy server settings.

    func setTargetServer(_ server: NEProxyServer?, title: String, saveHandler: @escaping (NEProxyServer) -> Void) {

        targetServer = server ?? NEProxyServer(address: "", port: 0)

        navigationItem.title = title

        saveChangesCallback = saveHandler

    }

    /// Gather all of the inputs from the user and call saveChangesCallback. This function is called when the user taps on the "Done" button.

    @IBAction func saveProxyServer(_ sender: AnyObject) {

        guard let address = addressCell.textField.text,

            let portString = portCell.textField.text,

            let port = Int(portString)

            , !address.isEmpty && !portString.isEmpty

            else { return }

        let result = NEProxyServer(address: address, port: port)

        result.username = usernameCell.textField.text

        result.password = passwordCell.textField.text

        result.authenticationRequired = authenticationSwitchCell.isOn

        saveChangesCallback(result)

        // Go back to the main proxy settings view.

        performSegue(withIdentifier: "save-proxy-server-settings", sender: sender)

    }

}