LONDON-IOS/GME Remit/Utilities/WebLinks/WkWebView/WkWebViewController.swift

//
//  WkWebViewController.swift
//  GME Remit
//
//  Created by Mac on 12/25/18.
//  Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import WebKit

class WkWebViewController: UIViewController {
  
  var webView: WKWebView!
  var url: String?
  var headers: [KftcHeader]?
  weak var delegate: NewRegisterDelegate?
  
  var activityIndicator: UIActivityIndicatorView?
  let userContentController = WKUserContentController()
  @IBOutlet weak var closeButton: UIBarButtonItem!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    let preference = WKPreferences()
    preference.javaScriptEnabled = true
    preference.javaScriptCanOpenWindowsAutomatically = true
    
    let webConfiguration = WKWebViewConfiguration()
    
    userContentController.add(self, name: "test")
    
    webConfiguration.userContentController = userContentController
    webConfiguration.preferences = preference
    
    let webView = WKWebView.init(frame: view.frame, configuration: webConfiguration)
    webView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
    webView.allowsBackForwardNavigationGestures = true
    webView.uiDelegate = self
    webView.navigationDelegate = self
    
    view = webView
    self.webView = webView
    
    setUserAgentForCloudCert(webView: self.webView)
    
    activityIndicator = UIActivityIndicatorView(style: UIActivityIndicatorView.Style.gray)
    webView.addSubview(activityIndicator!)
    webView.isUserInteractionEnabled = true
    activityIndicator?.startAnimating()
    activityIndicator?.isHidden = false
    activityIndicator?.hidesWhenStopped = true
    webView.bringSubviewToFront(activityIndicator!)
    
    if let myURL = URL(string: url ?? "") {
      var myRequest = URLRequest(url: myURL)
      var header = [String: String]()
      
      headers?.forEach { model in
        header[model.key ?? ""] = model.value ?? ""
      }
      
      myRequest.allHTTPHeaderFields = header
      webView.load(myRequest)
      
    }
    
    closeButton.title = "penny_test_close_text".localized()
    
    if let count = navigationController?.viewControllers.count,
      count > 1 {
      navigationItem.leftBarButtonItem = nil
    }
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    setupNormalNavigation()
  }
  
  @IBAction func touchCloseButton(_ sender: UIBarButtonItem) {
    dismiss(animated: true, completion: nil)
  }
  
  private func setUserAgentForCloudCert(webView: WKWebView) {
    webView.evaluateJavaScript("navigator.userAgent") { (userAgent, _) in
      guard let userAgent = userAgent as? String else { return }
      webView.customUserAgent = "\(userAgent) yessign/wv/i-Lzo41VQc1vdRqXJD5Cw4;1.0"
    }
  }
  
  @IBAction func touchCertTest(_ sender: Any) {
    if let myURL = URL(string: "https://testapi.openbanking.or.kr/oauth/2.0/authorize?auth_type=0&response_type=code&client_id=KxvHs6w5RLvByYmLrj3vCeD9Y9fWknzvLHetOhUE&edit_option=on&scope=inquiry&redirect_uri=https://www.kftc.or.kr&state=abcdefghijklmnopqrstuvwxyz123456&lang=kor") {
      let myRequest = URLRequest(url: myURL)
      webView.load(myRequest)
    }
  }
}

extension WkWebViewController: WKUIDelegate, WKNavigationDelegate {
  func webView(
    _ webView: WKWebView,
    createWebViewWith configuration: WKWebViewConfiguration,
    for navigationAction: WKNavigationAction,
    windowFeatures: WKWindowFeatures
  ) -> WKWebView? {
    
    if navigationAction.targetFrame == nil {
      var urlComponent = URLComponents()
      let url = navigationAction.request.url
      
      urlComponent.scheme = url?.scheme
      urlComponent.host = url?.host
      urlComponent.path = url?.path ?? ""
      
      if urlComponent.url?.absoluteString.range(of: "yessign.or.kr/open/html/v2/") != nil {
        let popupWebView = WKWebView(
          frame: CGRect(x: -1, y: -1, width: 1, height: 1),
          configuration: configuration
        )
        
        popupWebView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        
        setUserAgentForCloudCert(webView: popupWebView)
        
        popupWebView.uiDelegate = self
        popupWebView.navigationDelegate = self
        
        view.addSubview(popupWebView)
        
        return popupWebView
      }
    }
    
    if navigationAction.request.url?.absoluteString.range(of: "yessign.or.kr") != nil {
      guard let url = navigationAction.request.url else { return nil }
      if UIApplication.shared.canOpenURL(url) {
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
      }
    }
    
    return nil
  }
  
  func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
    print("start")
    activityIndicator?.center = self.view.center
    activityIndicator?.startAnimating()
  }
  
  func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    activityIndicator?.stopAnimating()
    self.navigationItem.title = webView.title
  }
  
  func webView(
    _ webView: WKWebView,
    runJavaScriptAlertPanelWithMessage message: String,
    initiatedByFrame frame: WKFrameInfo,
    completionHandler: @escaping () -> Void
  ) {
    let alertController = UIAlertController(
      title: message,
      message: nil,
      preferredStyle: UIAlertController.Style.alert
    )
    
    alertController.addAction(
      UIAlertAction(title: "OK", style: UIAlertAction.Style.cancel) { _ in completionHandler()}
    )
    
    self.present(alertController, animated: true, completion: nil)
  }
  
  func webView(
    _ webView: WKWebView,
    didReceive challenge: URLAuthenticationChallenge,
    completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void
  ) {
    guard let trust = challenge.protectionSpace.serverTrust else { return }
    
    let credential = URLCredential(trust: trust)
    
    completionHandler(.useCredential, credential)
  }
}

extension WkWebViewController: WKScriptMessageHandler {
  func userContentController(
    _ userContentController: WKUserContentController,
    didReceive message: WKScriptMessage
  ) {
    print(message.name)
    if let body = message.body as? String, body.lowercased().contains("successful") {
      guard let delegate = delegate else {
        self.alert(type: .success, message: "Auto-Debit account register is complete.") {
          self.dismiss(animated: true, completion: nil)
        }
        return
      }
      
    } else {
      alert(type: .error, message: "An error occurred.\nPlease contact customer service team.") {
        self.dismiss(animated: true)
      }
    }
  }
}