app_delegate.swift

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate, PaymentResultDelegate,WKNavigationDelegate {
    
    var flutterResult: FlutterResult?
    
    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        
        GeneratedPluginRegistrant.register(with: self)
        
        let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    
        let navigationController = UINavigationController(rootViewController: controller);
        navigationController.navigationBar.barTintColor = hexStringToUIColor(hex: "#ff6000");
        navigationController.navigationBar.tintColor = .white;
        navigationController.setNavigationBarHidden(true, animated: false);

        self.window = UIWindow(frame: UIScreen.main.bounds);
        self.window?.rootViewController = navigationController;
        self.window?.makeKeyAndVisible();
        
        
        let platform = FlutterMethodChannel(name: "com.ebb.app/payment",
                                            binaryMessenger: controller.binaryMessenger)
        platform.setMethodCallHandler({
            (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            
            self.flutterResult = result
            
            guard call.method == "initiatePayment" else {
                result(FlutterMethodNotImplemented)
                return
            }
            
            guard let argument = call.arguments as? Dictionary<String,Any> else {
                result(FlutterError(code: "INVALID_ARGUMENTS", message: "No Valid argument found", details: ""))
                return
            }
            guard let argumentData = argument["data"] as? String else {
                result(FlutterError(code: "INVALID_ARGUMENTS", message: "No Valid argument found", details: ""))
                return
            }
            let jsonData = argumentData.data(using: .utf8)!
            let data = try! JSONDecoder().decode(Data.self, from: jsonData)
            
            self.initiatePayment(result: result, application: application, data: data)
        })
        
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
    
    private func initiatePayment(result: @escaping FlutterResult, application: UIApplication, data: Data) {
        if let nav = self.rootController() as? UINavigationController {
            nav.setNavigationBarHidden(false, animated: true);
        }
        let ipaySdk: Ipay = Ipay()
        ipaySdk.delegate = self
        let payment: IpayPayment = IpayPayment()
        payment.paymentId = ""
        payment.merchantKey = data.merchant_key
        payment.merchantCode = data.merchant_code
        
        payment.refNo = data.order_no
        payment.amount = data.amount
        payment.currency = "MYR"
        payment.prodDesc = "Payment for \(data.order_no)"
        payment.userName = data.name
        payment.userEmail = data.email
        payment.userContact = "9090909090"
        payment.country = "MY"
        payment.backendPostURL = data.backend_post_url
        payment.remark = ""
        
        DispatchQueue.main.async {
            guard let paymentView = ipaySdk.checkout(payment) as? WKWebView else {
                if let nav = self.rootController() as? UINavigationController {
                    nav.setNavigationBarHidden(true, animated: true);
                }
                result(FlutterError(code: "SDKERROR", message: "payment view not available", details: nil))
                return
            }
            
            guard let topViewController = AppDelegate.topViewController() else {
                if let nav = self.rootController() as? UINavigationController {
                    nav.setNavigationBarHidden(true, animated: true);
                }
                result(FlutterError(code: "SDK_VIEW_ERROR", message: "top view controller view not available", details: nil))
                return
            }
            
            let doneButton = UIBarButtonItem(title: "Close", style: UIBarButtonItem.Style.plain, target: self, action: #selector(self.buttonTapped));
            doneButton.tintColor = .white;
            topViewController.navigationItem.rightBarButtonItem = doneButton;
            
            paymentView.tag = 100
            paymentView.navigationDelegate = self
            paymentView.frame = CGRect(x: 0, y: 50, width: paymentView.frame.size.width, height: paymentView.frame.size.height - 50)
            paymentView.configuration.preferences.javaScriptEnabled = true
            paymentView.configuration.preferences.javaScriptCanOpenWindowsAutomatically = true
            
            topViewController.view.addSubview(paymentView)
        }
    }
    
    
    @objc func buttonTapped(sender : UIButton) {
        //Write button action here
        guard let topViewController = AppDelegate.topViewController() else {
            return
        }
        if let viewWithTag = topViewController.view.viewWithTag(100){
            viewWithTag.removeFromSuperview()
        }
        if let nav = self.rootController() as? UINavigationController {
            nav.setNavigationBarHidden(true, animated: true);
        }
    }
    
    private func rootController() -> UIViewController?{
        return UIApplication.shared.keyWindow?.rootViewController;
    }
    
    class func topViewController(base: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController? {
        if let nav = base as? UINavigationController {
            return topViewController(base: nav.visibleViewController)
        }
        if let tab = base as? UITabBarController {
            let moreNavigationController = tab.moreNavigationController
            
            if let top = moreNavigationController.topViewController, top.view.window != nil {
                return topViewController(base: top)
            } else if let selected = tab.selectedViewController {
                return topViewController(base: selected)
            }
        }
        if let presented = base?.presentedViewController {
            return topViewController(base: presented)
        }
        return base
    }
    
    /*
     WebView Delegates
     */
    
    func webView(_ webView: WKWebView, didFinish: WKNavigation!){
        
    }
    
    func webView(_ webView: WKWebView, didFail: WKNavigation!, withError: Error){
        
    }
    
    func webView(_ webView:WKWebView, didFailProvisionalNavigation: WKNavigation!, withError: Error){
        
    }
    
    func webView(_ webView:WKWebView, didCommit: WKNavigation!){
        
    }
    
    func webView(_ webView:WKWebView, didReceiveServerRedirectForProvisionalNavigation: WKNavigation!){
        
    }
    /*
     Payment SDK Protocol
     */
    
    func paymentSuccess(_ refNo: String!, withTransId transId: String!, withAmount amount: String!, withRemark remark: String!, withAuthCode authCode: String!) {
        sendStatus(withTransId: transId, withOrderNo: refNo, withStatus: "SUCCESS", withExtra: authCode)
    }
    
    func paymentFailed(_ refNo: String!, withTransId transId: String!, withAmount amount: String!, withRemark remark: String!, withErrDesc errDesc: String!) {
        sendStatus(withTransId: transId, withOrderNo: refNo, withStatus: "FAILED", withExtra: errDesc)
    }
    
    func paymentCancelled(_ refNo: String!, withTransId transId: String!, withAmount amount: String!, withRemark remark: String!, withErrDesc errDesc: String!) {
        sendStatus(withTransId: transId, withOrderNo: refNo, withStatus: "CANCELLED", withExtra: errDesc)
    }
    
    func requerySuccess(_ refNo: String!, withMerchantCode merchantCode: String!, withAmount amount: String!, withResult result: String!) {
        
    }
    
    func requeryFailed(_ refNo: String!, withMerchantCode merchantCode: String!, withAmount amount: String!, withErrDesc errDesc: String!) {
        
    }
    
    func sendStatus(withTransId transId:String, withOrderNo orderNo:String, withStatus status:String, withExtra extra:String){
        do{
            let paymentResponse = PaymentResponse(status: status, trans_id: transId, order_no: orderNo, extra: extra)
            let jsonData = try JSONEncoder().encode(paymentResponse)
            let jsonString = String(data: jsonData, encoding: .utf8)!
            
            if(self.flutterResult != nil && jsonString != ""){
                self.flutterResult?(jsonString)
            }
        }catch _{
            if(self.flutterResult != nil){
                self.flutterResult?(FlutterError(code: "INVALID_RESPONSE", message: "Invalid Response Check Status in My Orders", details: ""))
            }
        }
        if let nav = self.rootController() as? UINavigationController {
            nav.setNavigationBarHidden(true, animated: true);
        }
    }
    
    func hexStringToUIColor (hex:String) -> UIColor {
        var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()

        if (cString.hasPrefix("#")) {
            cString.remove(at: cString.startIndex)
        }

        if ((cString.count) != 6) {
            return UIColor.gray
        }

        var rgbValue:UInt64 = 0
        Scanner(string: cString).scanHexInt64(&rgbValue)

        return UIColor(
            red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
            alpha: CGFloat(1.0)
        )
    }
}

struct Data: Codable {
    var name:String
    var email:String
    var order_no:String
    var amount: String
    var backend_post_url:String
    var merchant_key:String;
    var merchant_code:String;
}

struct PaymentResponse: Codable{
    var status:String
    var trans_id:String
    var order_no: String
    var extra:String
    
    init(status: String, trans_id: String, order_no: String, extra: String) {
        self.status = status
        self.trans_id = trans_id
        self.order_no = order_no
        self.extra = extra
    }
}