/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The app's view controller class.

 */

import SceneKit

class ViewController: NSViewController {

    @IBOutlet private weak var sceneView: SCNView!

    @IBOutlet private weak var popupButton: NSPopUpButton!

    @IBOutlet private var configButton: NSButton!

    private var controller: Controller!

    override func viewDidLoad() {

        super.viewDidLoad()

        controller = Controller(view: sceneView)

        controller.selectScene(at: 0)

        configurePopupButton()

    }

    override func viewWillAppear() {

        guard let window = view.window else { return }

        window.appearance = NSAppearance(named: NSAppearanceNameVibrantDark)

        let accessoryViewController = NSTitlebarAccessoryViewController()

        accessoryViewController.view = configButton

        accessoryViewController.layoutAttribute = .trailing

        window.addTitlebarAccessoryViewController(accessoryViewController)

    }

    // MARK: UI for Image Selection

    private func configurePopupButton() {

        for i in 0 ..< controller.sceneTitles.count {

            let item = NSMenuItem(title: controller.sceneTitles[i], action: #selector(sceneDidChange), keyEquivalent: "")

            item.tag = i

            popupButton.menu?.addItem(item)

        }

    }

    private dynamic func sceneDidChange(_ sender: AnyObject?) {

        let menuItem = sender as! NSMenuItem

        controller.selectScene(at: menuItem.tag)

    }

    // MARK: Split View Handle and Mouse Events

    private func updateHandlePosition(with event: NSEvent) {

        let location = sceneView.convert(event.locationInWindow, from: nil)

        let splitFraction = Float(location.x / view.bounds.size.width)

        controller.splitFraction = splitFraction

    }

    override func mouseDragged(with event: NSEvent) {

        updateHandlePosition(with: event)

    }

    override func mouseUp(with event: NSEvent) {

        updateHandlePosition(with: event)

    }

    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {

        if let destination = segue.destinationController as? ConfigViewController, segue.identifier == "ConfigPopover" {

            destination.visualizationType = controller.visualizationType

            destination.didChangeVisualizationTypeHandler = { [weak self] type in

                self?.controller.visualizationType = type

            }

        }

    }

}

class ConfigViewController : NSViewController {

    @IBOutlet private weak var gamutClampButton: NSButton!

    @IBOutlet private weak var wideGamutHighlightButton: NSButton!

    var didChangeVisualizationTypeHandler: (Controller.VisualizationType) -> (Void) = { _ in }

    var visualizationType: Controller.VisualizationType = .gamutClamp {

        didSet {

            updateSelectedRadioButton()

        }

    }

    override func viewDidLoad() {

        updateSelectedRadioButton()

    }

    private func updateSelectedRadioButton() {

        if isViewLoaded {

            gamutClampButton.state = visualizationType == .gamutClamp ? NSOnState : NSOffState

            wideGamutHighlightButton.state = visualizationType == .wideGamutHighlight ? NSOnState : NSOffState

        }

    }

    @IBAction private func pickVisualizationMode(_ sender: NSButton) {

        let visualizationType = Controller.VisualizationType(rawValue: sender.tag)!

        didChangeVisualizationTypeHandler(visualizationType)

    }

}