.package(url: "https://github.com/sindresorhus/Preferences", from: "0.2.1")

import Preferences

extension PreferencePaneIdentifier {
	static let general = PreferencePaneIdentifier("general")
	static let advanced = PreferencePaneIdentifier("advanced")
}

import Cocoa
import Preferences

final class GeneralPreferenceViewController: NSViewController, PreferencePane {
	let preferencePaneIdentifier = PreferencePaneIdentifier.general
	let toolbarItemTitle = "General"
	let toolbarItemIcon = NSImage(named: NSImage.preferencesGeneralName)!

	override var nibName: NSNib.Name? {
		return "GeneralPreferenceViewController"
	}

	override func viewDidLoad() {
		super.viewDidLoad()

		// Setup stuff here
	}
}

import Cocoa
import Preferences

final class AdvancedPreferenceViewController: NSViewController, PreferencePane {
	let preferencePaneIdentifier = PreferencePaneIdentifier.advanced
	let toolbarItemTitle = "Advanced"
	let toolbarItemIcon = NSImage(named: NSImage.advancedName)!

	override var nibName: NSNib.Name? {
		return "AdvancedPreferenceViewController"
	}

	override func viewDidLoad() {
		super.viewDidLoad()

		// Setup stuff here
	}
}

import Cocoa
import Preferences

@NSApplicationMain
final class AppDelegate: NSObject, NSApplicationDelegate {
	@IBOutlet private var window: NSWindow!

	lazy var preferencesWindowController = PreferencesWindowController(
		preferencePanes: [
			GeneralPreferenceViewController(),
			AdvancedPreferenceViewController()
		]
	)

	func applicationDidFinishLaunching(_ notification: Notification) {}

	@IBAction
	func preferencesMenuItemActionHandler(_ sender: NSMenuItem) {
		preferencesWindowController.show()
	}
}

// …
lazy var preferencesWindowController = PreferencesWindowController(
	preferencePanes: [
		GeneralPreferenceViewController(),
		AdvancedPreferenceViewController()
	],
	style: .segmentedControl
)
// …

public protocol PreferencePane: AnyObject {
	var preferencePaneIdentifier: PreferencePaneIdentifier { get }
	var toolbarItemTitle: String { get }
	var toolbarItemIcon: NSImage { get } // Not required when using the .`segmentedControl` style
}

public enum PreferencesStyle {
	case toolbarItems
	case segmentedControl
}

public final class PreferencesWindowController: NSWindowController {
	init(
		preferencePanes: [PreferencePane],
		style: PreferencesStyle = .toolbarItems,
		animated: Bool = true
	)

	func show(preferencePane: PreferencePaneIdentifier? = nil)

	func hideWindow()
}