/*

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

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This file contains the ConnectionRuleListController class, which controls a list of Connect On Demand connection rules.

*/

import UIKit

import NetworkExtension

/// A view controller object for a view that displays a editable list of Evaluate Connection rules.

class ConnectionRuleListController: ListViewController {

    // MARK: Properties

    /// The Connect On Demand rule containing the connection rules being displayed.

    var targetRule = NEOnDemandRuleEvaluateConnection()

    /// The number of connection rules.

    override var listCount: Int {

        return targetRule.connectionRules?.count ?? 0

    }

    /// Returns UITableViewCellAccessoryType.DetailButton.

    override var listAccessoryType: UITableViewCellAccessoryType {

        return .detailButton

    }

    /// Returns UITableViewCellAccessoryType.DetailButton.

    override var listEditingAccessoryType: UITableViewCellAccessoryType {

        return .detailButton

    }

    /// The text to display in the "add a new item" table cell.

    override var listAddButtonText: String {

        return "Add Connection Rule..."

    }

    // MARK: UIViewController

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

    override func viewDidLoad() {

        isAddEnabled = true

        isAlwaysEditing = true

        super.viewDidLoad()

    }

    // MARK: ListViewController

    /// Set up the destination view controller for a segue triggered by the user tapping on a cell.

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

        guard let identifier = segue.identifier,

            let ruleAddEditController = segue.destination as? ConnectionRuleAddEditController

            else { return }

        switch identifier {

            case "edit-connection-rule":

                // The user tapped on a rule in the connection rule list.

                guard let connectionRule = targetRule.connectionRules?[index] else { break }

                ruleAddEditController.setTargetRule(connectionRule, title: "Connection Rule") { newRule in

                    self.targetRule.connectionRules?[index] = newRule

                }

            case "add-connection-rule":

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

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

                    self.targetRule.connectionRules?.append(newRule)

                }

            default:

                break

        }

    }

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

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

        return targetRule.connectionRules?[index].action.description ?? ""

    }

    /// Remove the rule at the given index in the list.

    override func listRemoveItemAtIndex(_ index: Int) {

        targetRule.connectionRules?.remove(at: index)

    }

    // MARK: Interface

    /// Handle an unwind segue back to this view controller.

    @IBAction func handleUnwind(_ sender: UIStoryboardSegue) {

    }

}