/*

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

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This file contains the OnDemandRuleListController class, which is responsible for controlling a list of Connect On Demand rules.

*/

import UIKit

import NetworkExtension

/// A view controller for a view displaying a list of Connect On Demand rules.

class OnDemandRuleListController: ListViewController {

    // MARK: Properties

    /// The VPN configuration containing the Connect On Demand rules.

    var targetManager: NEVPNManager = NEVPNManager.shared()

    /// The text to display in the list's "add new item" row.

    override var listAddButtonText: String {

        return "Add On Demand Rule..."

    }

    /// The number of Connect On Demand rules.

    override var listCount: Int {

        return targetManager.onDemandRules?.count ?? 0

    }

    /// Returns UITableViewCellAccessoryType.DetailButton

    override var listAccessoryType: UITableViewCellAccessoryType {

        return .detailButton

    }

    /// Returns UITableViewCellAccessoryType.DetailButton

    override var listEditingAccessoryType: UITableViewCellAccessoryType {

        return .detailButton

    }

    // MARK: UIViewController

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

    override func viewDidLoad() {

        isAddEnabled = true

        isAlwaysEditing = true

        super.viewDidLoad()

    }

    // MARK: Interface

    /// Handle unwind segues to this view controller.

    @IBAction func handleUnwind(_ sender: UIStoryboardSegue) {

    }

    // MARK: ListViewController

    /// Set up the destination view controller of a segue away from this view controller.

    override func listSetupSegue(_ segue: UIStoryboardSegue, forItemAtIndex index: Int) {

        guard let identifier = segue.identifier,

            let ruleAddEditController = segue.destination as? OnDemandRuleAddEditController

            else { return }

        switch identifier {

            case "edit-on-demand-rule":

                // The user tapped on the editing accessory of a rule in the list.

                guard let rule = targetManager.onDemandRules?[index] else { break }

                ruleAddEditController.setTargetRule(rule, title: "On Demand Rule") { newRule in

                    self.targetManager.onDemandRules?[index] = newRule

                }

            case "add-on-demand-rule":

                // The user tapped on the "add a new rule" row.

                ruleAddEditController.setTargetRule(nil, title: "Add On Demand Rule") { newRule in

                    if self.targetManager.onDemandRules == nil {

                        self.targetManager.onDemandRules = [NEOnDemandRule]()

                    }

                    self.targetManager.onDemandRules?.append(newRule)

                }

            default:

                break

        }

    }

    /// Return a description of the rule at the given index in the list.

    override func listTextForItemAtIndex(_ index: Int) -> String {

        return targetManager.onDemandRules?[index].action.description ?? ""

    }

    /// Remove a rule from the list.

    override func listRemoveItemAtIndex(_ index: Int) {

        targetManager.onDemandRules?.remove(at: index)

    }

}