//
//  SceneDelegate.swift
//  EmployeeDirectory
//
//  Created by Matt Bruce on 1/20/25.
//

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    let keyAppVersion = "savedAppVersion"
    
    func getAppVersion() -> String {
        if let version = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String,
           let build = Bundle.main.infoDictionary?["CFBundleVersion"] as? String {
            return "\(version) (\(build))"
        }
        return "Unknown Version"
    }
    
    // Retrieve saved version
    func getSavedAppVersion() -> String? {
        return UserDefaults.standard.string(forKey: keyAppVersion)
    }
    
    func saveAppVersion(_ version: String) {
        UserDefaults.standard.set(version, forKey: keyAppVersion)
        UserDefaults.standard.synchronize()
    }

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        
        // Ensure the scene is properly configured
        guard let windowScene = (scene as? UIWindowScene) else { return }
        
        // Create a new UIWindow
        let window = UIWindow(windowScene: windowScene)
        
        // Set up the root view controller
        let employeeListVC = EmployeesViewController()
        let navigationController = UINavigationController(rootViewController: employeeListVC)
        window.rootViewController = navigationController
        
        // get app version
        let currentAppVersion = getAppVersion()
        
        // get app cached version
        let savedAppVersion = getSavedAppVersion() ?? "none"
        
        // check to see if there is a diff and if so clear cache
        if savedAppVersion != currentAppVersion {
            EmployeeCacheService.shared.clear()
            // save the current app version for next run
            saveAppVersion(currentAppVersion)
        }
        
        // Set the window to the scene
        self.window = window
        window.makeKeyAndVisible()
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not necessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.
    }


}