/*

 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: UIViewController, UITabBarDelegate {

    @IBOutlet private weak var sceneView: SCNView!

    @IBOutlet private weak var tabBar: UITabBar!

    @IBOutlet private weak var configBarButtonItem: UIBarButtonItem!

    private var controller: Controller!

    override func viewDidLoad() {

        super.viewDidLoad()

        controller = Controller(view: sceneView)

        controller.selectScene(at: 0)

        navigationItem.title = controller.sceneTitles[0]

        configureTabBar()

    }

    // MARK: UI for Visualization Type

    @IBAction func pickVisualization(_ sender: AnyObject?) {

        let alert = UIAlertController(title: "Left Side Visualization", message: nil, preferredStyle: .actionSheet)

        let clampAction = UIAlertAction(title: "Clamp to sRGB", style: .default) { [weak self] action in

            self?.controller.visualizationType = .gamutClamp

        }

        if controller.visualizationType == .gamutClamp {

            clampAction.isEnabled = false

        }

        alert.addAction(clampAction)

        let wideGamutHighlightAction = UIAlertAction(title: "Highlight Wide Gamut", style: .default) { [weak self] action in

            self?.controller.visualizationType = .wideGamutHighlight

        }

        if controller.visualizationType == .wideGamutHighlight {

            wideGamutHighlightAction.isEnabled = false

        }

        alert.addAction(wideGamutHighlightAction)

        alert.popoverPresentationController?.barButtonItem = configBarButtonItem

        self.present(alert, animated: true, completion: nil)

    }

    // MARK: UI for Image Selection

    private func configureTabBar() {

        var items = [UITabBarItem]()

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

            let item = UITabBarItem(title: controller.sceneTitles[i], image: nil, tag: i)

            items.append(item)

        }

        tabBar.items = items

        tabBar.delegate = self

    }

    // MARK: UITabBarDelegate Conformance

    func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {

        controller.selectScene(at: item.tag)

        navigationItem.title = controller.sceneTitles[item.tag]

    }

    // MARK: Split View Handle and Touch Events

    private func updateHandlePosition(_ touch: UITouch) {

        let location = touch.location(in: view)

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

        controller.splitFraction = splitFraction

    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

        super.touchesBegan(touches, with: event)

        updateHandlePosition(touches.first!)

    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

        super.touchesMoved(touches, with: event)

        updateHandlePosition(touches.first!)

    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

        super.touchesEnded(touches, with: event)

        updateHandlePosition(touches.first!)

    }

}