//
//  JSViewController.swift
//  JSNavigationController
//

import AppKit

class JSViewController: NSViewController, JSNavigationBarViewControllerProvider {
    
    private struct Constants {
        static let segueTemplatesKey = "segueTemplates"
        static let segueIdentifierKey = "identifier"
        static let navigationControllerPushIdentifier = "navigationControllerPush"
        static let navigationBarViewControllerIdentifier = "navigationBarViewController"
    }

	private(set) var destinationViewController: NSViewController?
    private(set) var destinationViewControllers: [String: NSViewController] = [:]
    var navigationBarVC: NSViewController?
    weak var navigationController: JSNavigationController?

    func navigationBarViewController() -> NSViewController {
		guard let navigationBarVC = self.navigationBarVC else { fatalError("You must set the navigationBar view controller") }
		return navigationBarVC
	}

	// MARK: - View Lifecycle
    override func awakeFromNib() {
		if type(of: self).instancesRespond(to: #selector(NSViewController.awakeFromNib)) {
			super.awakeFromNib()
		}
		self.setupSegues()
	}

	// MARK: - Segues
	private func setupSegues() {
        guard let segues = self.value(forKey: Constants.segueTemplatesKey) as? [NSObject] else { return }
		for segue in segues {
            if let id = segue.value(forKey: Constants.segueIdentifierKey) as? String {
				self.performSegue(withIdentifier: id, sender: self)
			}
		}
	}

    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
		
        guard let segueIdentifier = segue.identifier else { return }

		switch segueIdentifier {
		case Constants.navigationBarViewControllerIdentifier:
			self.navigationBarVC = segue.destinationController as? NSViewController
		default:
			if segueIdentifier.contains(Constants.navigationControllerPushIdentifier) {
				if segueIdentifier.count > Constants.navigationControllerPushIdentifier.count && segueIdentifier.contains("#") {
					if let key = segueIdentifier.split(separator: "#").map({ String($0) }).last {
						self.destinationViewControllers[key] = segue.destinationController as? NSViewController
					}
				} else {
					self.destinationViewController = segue.destinationController as? NSViewController
				}
			}
		}
	}
}