//
//  AppDelegate.swift
//  Reader
//
//  Created by Shadowfacts on 10/29/21.
//

import UIKit
import WebKit
import OSLog

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        swizzleWKWebView()
        
        return true
    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }
    
    private func swizzleWKWebView() {
        let selector = Selector(("_updateScrollViewBackground"))
        var originalIMP: IMP?
        let imp = imp_implementationWithBlock({ (self: WKWebView) in
            if let originalIMP = originalIMP {
                let original = unsafeBitCast(originalIMP, to: (@convention(c) (WKWebView, Selector) -> Void).self)
                original(self, selector)
            } else {
                os_log(.error, "Missing originalIMP for -[WKWebView _updateScrollViewBackground], did WebKit change?")
            }
            
            self.scrollView.indicatorStyle = .default
            
        } as (@convention(block) (WKWebView) -> Void))
        originalIMP = class_replaceMethod(WKWebView.self, selector, imp, "v@:")
    }

}