LONDON-IOS/GMERemittance/Library/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]?
    
    var activityIndicator: UIActivityIndicatorView?
    let userContentController = WKUserContentController()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        
        let preference = WKPreferences()
        preference.javaScriptEnabled = true
        let webConfiguration = WKWebViewConfiguration()
        
        // test 1
        userContentController.add(self, name: "test")
        
        // test 2
        webConfiguration.userContentController = userContentController
        webConfiguration.preferences = preference
        let webView = WKWebView.init(frame: self.view.frame, configuration: webConfiguration)
        
        webView.uiDelegate = self
        webView.navigationDelegate = self
        self.view = webView
        self.webView = webView
        // other setup
        
        addCloseButton()
        
        self.activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)
        self.webView.addSubview(activityIndicator!)
        self.webView.isUserInteractionEnabled = true
        self.activityIndicator?.startAnimating()
        self.activityIndicator?.isHidden = false
        self.activityIndicator?.hidesWhenStopped = true
        self.webView.bringSubview(toFront: activityIndicator!)

        let headers = self.headers ?? []
        
        
        
        let _url = (self.url ?? "")
        
        print(_url)

        if let myURL = URL(string: _url) {
            var myRequest = URLRequest(url: myURL)
//
//            headers.forEach({
//                     myRequest.setValue($0.key ?? "", forHTTPHeaderField: $0.value ?? "")
//
//            })
//
//            print(myRequest.allHTTPHeaderFields)
            webView.load(myRequest)
        }
    }
    
    private func addCloseButton() {
        let button = UIBarButtonItem.init(title: "Close", style: UIBarButtonItemStyle.plain, target: self, action: #selector(self._dismiss))
        self.navigationItem.rightBarButtonItem = button
    }
    
    @objc private func _dismiss() {
        self.dismiss(animated: true, completion: nil)
    }
}


extension WkWebViewController: WKUIDelegate, WKNavigationDelegate {

    
    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
        print("start")
        activityIndicator?.center = self.view.center
//        activityIndicator?.isHidden = false
        activityIndicator?.startAnimating()
    }
    
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
//        activityIndicator?.isHidden = true
        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: {});
    }
    
    
    
}

extension WkWebViewController: WKScriptMessageHandler  {
    
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        print(message.name)
        if let body = message.body as? String {
            self.alert(message: body, title: nil) {
                self.dismiss(animated: true, completion: nil)
            }
        }
        
    }
    
    
}