//
//  SceneDelegate.swift
//  feedless
//
//  Created by Rogerio Chaves on 28/04/20.
//  Copyright © 2020 Rogerio Chaves. All rights reserved.
//

import UIKit
import SwiftUI

import JavaScriptCore

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?


    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).


        let context = JSContext()!
        context.exceptionHandler = { context, exception in
            print(exception!.toString())
        }

        let require: @convention(block) (String) -> (JSValue?) = { path in
            let expandedPath = NSString(string: path).expandingTildeInPath

            // Return void or throw an error here.
            guard FileManager.default.fileExists(atPath: expandedPath)
                else { debugPrint("Require: filename \(expandedPath) does not exist")
                       return nil }

            guard let fileContent = try? String(contentsOfFile: expandedPath)
                else { return nil }

            return context.evaluateScript(fileContent)
        }

        context.setObject(require, forKeyedSubscript: "require" as NSString)

        guard let url = Bundle.main.url(forResource: "index", withExtension: "js") else {
            fatalError("missing resource index.js")
        }

        do {
            context.evaluateScript(try String(contentsOf: url), withSourceURL: url)
        } catch _ {
            fatalError("could not evaluate index.js")
        }

        let main = context.objectForKeyedSubscript("main")
        print("aaaaaaaaaaaaaaaaaaaa", main?.call(withArguments: []))

        // Create the SwiftUI view that provides the window contents.
        let contentView = Index()

        // Use a UIHostingController as window root view controller.
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: contentView)
            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 neccessarily 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.
    }


}