//
//  PreferencesViewController.swift
//  MullvadVPN
//
//  Created by pronebird on 19/05/2021.
//  Copyright © 2021 Mullvad VPN AB. All rights reserved.
//

import Logging
import UIKit

class PreferencesViewController: UITableViewController, PreferencesDataSourceDelegate,
    TunnelObserver
{
    private let dataSource = PreferencesDataSource()

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }

    init() {
        super.init(style: .grouped)
    }

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

    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.backgroundColor = .secondaryColor
        tableView.separatorColor = .secondaryColor
        tableView.rowHeight = UITableView.automaticDimension
        tableView.estimatedRowHeight = 60

        dataSource.tableView = tableView
        dataSource.delegate = self

        navigationItem.title = NSLocalizedString(
            "NAVIGATION_TITLE",
            tableName: "Preferences",
            value: "Preferences",
            comment: ""
        )
        navigationItem.rightBarButtonItem = editButtonItem

        TunnelManager.shared.addObserver(self)
        dataSource.update(from: TunnelManager.shared.settings.dnsSettings)
    }

    override func setEditing(_ editing: Bool, animated: Bool) {
        dataSource.setEditing(editing, animated: animated)

        navigationItem.setHidesBackButton(editing, animated: animated)

        // Disable swipe to dismiss when editing
        isModalInPresentation = editing

        super.setEditing(editing, animated: animated)
    }

    // MARK: - PreferencesDataSourceDelegate

    func preferencesDataSource(
        _ dataSource: PreferencesDataSource,
        didChangeViewModel dataModel: PreferencesViewModel
    ) {
        let dnsSettings = dataModel.asDNSSettings()

        TunnelManager.shared.setDNSSettings(dnsSettings)
    }

    // MARK: - TunnelObserver

    func tunnelManagerDidLoadConfiguration(_ manager: TunnelManager) {
        // no-op
    }

    func tunnelManager(_ manager: TunnelManager, didUpdateTunnelStatus tunnelStatus: TunnelStatus) {
        // no-op
    }

    func tunnelManager(_ manager: TunnelManager, didFailWithError error: Error) {
        // no-op
    }

    func tunnelManager(
        _ manager: TunnelManager,
        didUpdateTunnelSettings tunnelSettings: TunnelSettingsV2
    ) {
        dataSource.update(from: tunnelSettings.dnsSettings)
    }

    func tunnelManager(_ manager: TunnelManager, didUpdateDeviceState deviceState: DeviceState) {
        // no-op
    }
}