LONDON-IOS/GMERemittance/Payment/RecipientTranscationViewController.swift

//
//  RecipientTranscationViewController.swift
//  GMERemittance
//
//  Created by Fm-user on 12/22/17.
//  Copyright © 2017 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit

class RecipientTranscationViewController: UIViewController {
    
    @IBOutlet weak var pickerViewCurrency: UIPickerView!
    @IBOutlet weak var viewContainWithKoreanCurrency: UIView!
    @IBOutlet weak var viewContainWithOtherCountryCurrency: UIView!
    @IBOutlet weak var availableBalance: UILabel!
    @IBOutlet weak var viewContentMain: UIView!
    @IBOutlet weak var buttonSave: UIButton!
    @IBOutlet weak var dropDownCountryButton: UIButton!
    @IBOutlet weak var imageViewCountry: UIImageView!
    @IBOutlet weak var transferLimitMessageLabel: UILabel!
    @IBOutlet weak var moneySendingMessageLabel: UILabel!
    @IBOutlet weak var rewardPointlabel: UILabel!
    @IBOutlet weak var serviceFeeLabel: UILabel!
    @IBOutlet weak var transactionLimit: UILabel!
    @IBOutlet weak var labelCurrency: UILabel!
    @IBOutlet weak var labelExchangeRate: UILabel!
    @IBOutlet weak var viewBalance: UIView!
    @IBOutlet weak var viewExchange: UIView!
    @IBOutlet weak var textFieldKRW: UITextField!
    @IBOutlet weak var textFieldNPR: UITextField!
    
    private var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
    private var numberPad = UIKeyboardType.numberPad
    
    private var amountNPR: Float!
    private var networkDialogShown: Bool = false
    private var buttomCurrencyStatus: Bool?
    private var isScrolled: Bool = false
    
    //Recieved from previous ViewController
    var recipient: Recipient?
    var paymentMode: String?
    var paymentMethodId: String?
    //Recieved, updated and transferred to next
    var transferDetails: [String: String]?
    //Added for home delivery
    var homeDetails: [String: String]?
    /// to send exchange body
    private var exchangeData: [String: Any]?
    
    private var pickerData: [String] = [String]()
    private var calculateBy: String?
    private var currencyDetailArray: [Currency] = [Currency]()
    private var currencyArray = [String]()
    private var transactionviewmodel = TransactionViewModel()
    
    public static var recipientListViewControllerConnectionCheck = 0
    
    @IBAction func selectPaymentMethod(_ sender: Any) {
        dismissKeyboard()
        performSegue(withIdentifier: "reviewTransfer", sender: nil)
    }
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setUpAnotherLoginListener(genericviewmodel: transactionviewmodel)
        
        pickerViewCurrency.dataSource = self
        pickerViewCurrency.delegate = self
        
        let tap = UITapGestureRecognizer(target: self, action: #selector(handleTapKoreanCurrencyView))
        tap.delegate = self as? UIGestureRecognizerDelegate
        viewContainWithKoreanCurrency.addGestureRecognizer(tap)
        
        let tapOtherView = UITapGestureRecognizer(target: self, action: #selector(handleTapOtherCountryCurrencyView))
        tap.delegate = self as? UIGestureRecognizerDelegate
        viewContainWithOtherCountryCurrency.addGestureRecognizer(tapOtherView)
        
        ///Background listner
        let notificationCenter = NotificationCenter.default
        notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: Notification.Name.UIApplicationWillResignActive, object: nil)
        
        setUpNavBar(id: 201, title: "Send Money")
        viewContentMain.isHidden = true
        buttomCurrencyStatus = true
        buttonSave.isUserInteractionEnabled = false
        buttonSave.alpha = 0.3
        textFieldPlaceHolderAttribute()
        countryPickerViewButtonDesign()
        
        
        transactionviewmodel.transactionViewConnectionTimeOut.value = nil
        /**
         connection timeout
         */
        transactionviewmodel.transactionViewConnectionTimeOut.bind { [unowned self] in
            guard $0 != nil else {
                return
            }
            self.stopLoading()
            if RecipientTranscationViewController.recipientListViewControllerConnectionCheck == 0{
                RecipientTranscationViewController.recipientListViewControllerConnectionCheck = RecipientTranscationViewController.recipientListViewControllerConnectionCheck+1
                self.popUpMessage(value: 25)
            }
        }
        
        /**
         Check internet connection
         */
        transactionviewmodel.internetConnection.value = nil
        transactionviewmodel.internetConnection.bind { [unowned self] in
            guard $0 != nil else {
                return
            }
            self.stopLoading()
            if !self.networkDialogShown {
                self.popUpMessage(value: 15)
                self.networkDialogShown = true
            }
        }
        
        guard paymentMode != nil else {
            self.popUpMessageError(value: 10, message: "Error getting data")
            return
        }
        
        if paymentMode! == paymentModeType.cashPayment.rawValue {
            guard recipient != nil else {
                self.popUpMessageError(value: 10, message: "Error getting data")
                return
            }
        } else {
            guard transferDetails?.count != 0 && recipient != nil else {
                self.popUpMessageError(value: 10, message: "Error getting data")
                return
            }
            transactionviewmodel.setTransferDetails(transferDetails: transferDetails!)
        }
        
        exchangeRateBindCall()
        transactionInfoBindCall()
        currrencyBindCall()
        countryBindCall()
        
        self.startLoading()
        transactionviewmodel.fetchTransactionInfo(transactionInfo: transactionInfoParam())
        transactionviewmodel.fetchCurrency(currencyInfo: currencyParam())
        
        if let countryId = recipient?.countryId{
            transactionviewmodel.fetchCountry(countryId: countryId)
        }
        textFieldKRW.delegate = self
        textFieldNPR.delegate = self
        viewBalance.layer.cornerRadius = 10
        viewExchange.layer.cornerRadius = 10
    }
    
    /**
      In case when app move to background
     */
    @objc func appMovedToBackground() {
        textFieldKRW.resignFirstResponder()
        textFieldNPR.resignFirstResponder()
    }
    
    /**
     Disable user interaction while fetching data from api
     */
    func startLoading(){
        disableUserInteractions()
        showActivityIndicator(activityIndicator: activityIndicator)
    }
    
    /**
     Enable user interaction while fetching data from api
     */
    func stopLoading(){
        self.dismissActivityIndicator(activityIndicator: self.activityIndicator)
        self.enableUserInteractions()
    }
    
    /**
     Handle tap action in view
     */
    @objc func handleTapKoreanCurrencyView(){
        textFieldKRW.becomeFirstResponder()
    }
    
    /**
     Handle tap action in view
     */
    @objc func handleTapOtherCountryCurrencyView(){
        textFieldNPR.becomeFirstResponder()
    }
    
    /**
     Api request for exchange rate
     */
    func exchangeRateBindCall(){
        transactionviewmodel.exchangeRateAvailable.bind { [unowned self] in
            guard $0 != nil else {
                return
            }
            self.stopLoading()
            
            guard $0! else {
                self.popUpMessageError(value: 10, message: self.transactionviewmodel.getErrorMessage())
                self.viewContentMain.isHidden = false
                return
            }
            self.exchangeRateDisplay()
            self.serviceFeeDataDisplay()
            if self.paymentMode != paymentModeType.cashPayment.rawValue{
                if let transferDetails = self.transferDetails{
                    self.transactionviewmodel.setTransferDetails(transferDetails: transferDetails)
                }
            }
            self.textFieldNPR.text =  self.transactionviewmodel.getpAmt()
            self.textFieldKRW.text =  self.transactionviewmodel.getcAmt()
            self.rewardPointlabel.text = "+" + String(self.transactionviewmodel.getRewardPoint())
            self.viewContentMain.isHidden = false
            self.buttonSave.isUserInteractionEnabled = true
            self.buttonSave.alpha = 1
        }
    }
    
    /**
     Api request for transaction info
     */
    func transactionInfoBindCall(){
        transactionviewmodel.transactionInfoAvailable.bind { [weak self] in
            guard $0 != nil else {
                return
            }
            self?.stopLoading()
            
            guard $0! else {
                self?.popUpMessageError(value: 10, message: (self?.transactionviewmodel.getErrorMessage())!)
                self?.viewContentMain.isHidden = false
                
                return
            }
            if let availableBalance = UserDefaults.standard.object(forKey: "com.gmeremit.balance") as? String {
                self?.availableBalance.text = (self?.getCommaAddedAmountString(amountString: availableBalance ))! + " KRW"
            }
            self?.setTransferLimitMessage(amount: String(format: "%.0f", (self?.transactionviewmodel.getTransferLimit())!))
            self?.setTransactionLimit(amount:String(format: "%d", (self?.transactionviewmodel.getTransactionLimit())!))
            self?.setMoneySendingMessage(sender:(self?.recipient?.getFullName())!)
            self?.viewContentMain.isHidden = false
        }
    }
    
    /**
     Api request for currency
     */
    func currrencyBindCall(){
        transactionviewmodel.currencyInfoAvailable.bind{[weak self] in
            guard $0 != nil else {
                return
            }
            self?.stopLoading()
            
            guard $0! else {
                self?.popUpMessageError(value: 10, message: (self?.transactionviewmodel.getErrorMessage())!)
                self?.viewContentMain.isHidden = false
                
                return
            }
            if let count = self?.transactionviewmodel.getCurrencyArray().count{
                if count > 0{
                    self?.currencyDetailArray = (self?.transactionviewmodel.getCurrencyArray())!
                    self?.currencyArray = (self!.currencyDetailArray.map{$0.name!})
                    if let count = self?.currencyArray.count{
                        if count > 0{
                            self?.pickerData = (self?.currencyArray)!
                        }
                    }
                    if let currency = self?.pickerData[0]{
                        self?.labelCurrency.text = currency
                        self?.dropDownCountryButton.setTitle(currency + "  ", for: UIControlState.normal)
                    }
                }
            }
        }
    }
    
    /**
     Api request for country
     */
    func countryBindCall(){
        transactionviewmodel.countryInfoAvailable.bind{[weak self] in
            guard $0 != nil else {
                return
            }
            self?.stopLoading()
            
            guard $0! else {
                self?.popUpMessageError(value: 10, message: (self?.transactionviewmodel.getErrorMessage())!)
                self?.viewContentMain.isHidden = false
                
                return
            }
            if let flagUrl = self?.transactionviewmodel.getCountryDetail()[0].flagUrl{
                self?.imageViewCountry?.sd_setImage(with:URL(string: flagUrl),  placeholderImage: nil, options: [.progressiveDownload,.scaleDownLargeImages], completed: nil)
            }
        }
    }
    
    @IBAction func buttonCurrencyTap(_ sender: Any) {
        pickerViewCurrency.reloadAllComponents()
        if currencyArray.count != 0{
            self.pickerData = self.currencyArray
        }
        buttomCurrencyStatus = !buttomCurrencyStatus!
        if buttomCurrencyStatus! {
            pickerViewCurrency.isHidden = true
        } else {
            pickerViewCurrency.isHidden = false
        }
    }
    
    /**
     Get payment method id
     */
    func getPaymentMethodId() -> String{
        if paymentMode == paymentModeType.cashPayment.rawValue || paymentMode == paymentModeType.cashPaymentPartner.rawValue {
            paymentMethodId = paymentMethodIdType.cashMethod.rawValue
        } else if paymentMode == paymentModeType.bankPayment.rawValue {
            paymentMethodId = paymentMethodIdType.bankMethod.rawValue
        } else if paymentMode == paymentModeType.homeDelivery.rawValue {
            paymentMethodId = paymentMethodIdType.homeMethod.rawValue
        }
        return paymentMethodId!
    }
    
    /**
     Get transaction info param
     */
    func transactionInfoParam() -> [String: String]{
        var transactionParam: [String: String]?
        
        if let countryId = recipient?.countryId{
            transactionParam = ["countryId": (countryId),
                                "payoutMethodId": getPaymentMethodId()]
        }
        return transactionParam!
    }
    
    /**
     Get currency param
     */
    func currencyParam() -> [String: String]{
        var pam: [String: Any]?
        if let countryId = recipient?.countryId{
            pam = ["countryId": countryId,
                   "payoutMethodId": getPaymentMethodId(),
                   "payoutLocationId": transferDetails?["bankPayoutId"] ?? ""
                ] as [String : Any]
        }
        return pam as! [String : String]
    }
    
    /**
     Text field place holder attribute
     */
    func textFieldPlaceHolderAttribute(){
        textFieldKRW.attributedPlaceholder = NSAttributedString(string: "0",
                                                                attributes: [NSAttributedStringKey.foregroundColor: UIColor(red:0.93, green:0.11, blue:0.14, alpha:1.0)])
        textFieldNPR.attributedPlaceholder = NSAttributedString(string: "0",
                                                                attributes: [NSAttributedStringKey.foregroundColor: UIColor(red:0.93, green:0.11, blue:0.14, alpha:1.0)])
    }
    
    /**
     Country picker view button design
     */
    func countryPickerViewButtonDesign(){
        dropDownCountryButton.layer.borderColor = UIColor(red:0.93, green:0.11, blue:0.14, alpha:1.0).cgColor
        dropDownCountryButton.layer.borderWidth = 1.0
        dropDownCountryButton.layer.cornerRadius = 8
    }
    
    /**
     Exchange rate value display
     */
    func exchangeRateDisplay(){
        let exchangeRateValueColor =  UIColor(red: 236/255, green: 28/255.0, blue: 36/255, alpha: 1.0)
        let exchangeRate: String = String("Exchange Rate: ")
        
        let mutableExchangeRate = NSMutableAttributedString(string: exchangeRate)
        let mutableExchangeRateValue = NSMutableAttributedString(string: String(transactionviewmodel.getExchangeRate()))
        mutableExchangeRateValue.addAttribute(NSAttributedStringKey.foregroundColor, value: exchangeRateValueColor, range: NSRange(location:0, length: mutableExchangeRateValue.length))
        
        let exchangeRateData = NSMutableAttributedString()
        exchangeRateData.append(mutableExchangeRate)
        exchangeRateData.append(mutableExchangeRateValue)
        
        labelExchangeRate.attributedText = exchangeRateData
    }
    
    /**
     Display service fee data
     */
    func serviceFeeDataDisplay(){
        let serviceFeeValueColor =  UIColor(red: 236/255, green: 28/255.0, blue: 36/255, alpha: 1.0)
        let serviceFee: String = String("Service Fee: ")
        
        let mutableServiceFee = NSMutableAttributedString(string: serviceFee)
        let mutableServiceFeeValue = NSMutableAttributedString(string: transactionviewmodel.getTransferFee()  + " KRW"  + " (Inclusive)")
        mutableServiceFeeValue.addAttribute(NSAttributedStringKey.foregroundColor, value: serviceFeeValueColor, range: NSRange(location:0, length: mutableServiceFeeValue.length))
        
        let transferFee = NSMutableAttributedString()
        transferFee.append(mutableServiceFee)
        transferFee.append(mutableServiceFeeValue)
        
        serviceFeeLabel.attributedText = transferFee
    }
    
    /**
     Set custom first transaction message
     */
    func setFirstTransactionFreeMessage(){
        let feeMessage: String = String("Your First Transfer Fees is ")
        
        let mutableFeeMessage1 = NSMutableAttributedString(string: feeMessage)
        
        let attrs = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 15),NSAttributedStringKey.foregroundColor:UIColor.red]
        let freeMessageInBold = NSMutableAttributedString(string:"Free", attributes:attrs)
        
        let mutableFeeMessage = NSMutableAttributedString()
        mutableFeeMessage.append(mutableFeeMessage1)
        mutableFeeMessage.append(freeMessageInBold)
    }
    
    /**
     Set custom message money sending
     */
    func setMoneySendingMessage(sender:String){
        let sendingMessage: String = String("You are sending money to ")
        
        let mutableSenderMessage1 = NSMutableAttributedString(string: sendingMessage)
        
        let attrs = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 15)]
        let senderMessageInBold = NSMutableAttributedString(string:sender, attributes:attrs)
        
        let mutableSenderMessage = NSMutableAttributedString()
        mutableSenderMessage.append(mutableSenderMessage1)
        mutableSenderMessage.append(senderMessageInBold)
        
        moneySendingMessageLabel.attributedText = mutableSenderMessage
    }
    
    /**
     Set transfer limit message
     */
    func setTransferLimitMessage(amount:String){
        let transferMessage1: String = String("Transfer Limit Max \n")
        let transferMessage3: String = String(" KRW per day")
        
        let mutableTransferMessage1 = NSMutableAttributedString(string: transferMessage1)
        let mutableTransferMessage3 = NSMutableAttributedString(string: transferMessage3)
        
        let attrs = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 15)]
        let transferMessageInBold = NSMutableAttributedString(string:"\(amount)", attributes:attrs)
        
        let mutableTransferMessage = NSMutableAttributedString()
        mutableTransferMessage.append(mutableTransferMessage1)
        mutableTransferMessage.append(transferMessageInBold)
        mutableTransferMessage.append(mutableTransferMessage3)
        
        transferLimitMessageLabel.attributedText = mutableTransferMessage
    }
    
    /**
     Set transaction limit message
     */
    func setTransactionLimit(amount:String){
        let transactionLimitMessage1: String = String("Transaction Limit Upto \n")
        let transactionLimitMessage2: String = String(" times per day")
        
        let mutableTransactionLimitMessage1 = NSMutableAttributedString(string: transactionLimitMessage1)
        let mutableTransactionLimitMessage2 = NSMutableAttributedString(string: transactionLimitMessage2)
        
        let attrs = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 15)]
        let transactionLimitMessageInBold = NSMutableAttributedString(string:amount, attributes:attrs)
        
        let mutableTransactionLimitMessage = NSMutableAttributedString()
        mutableTransactionLimitMessage.append(mutableTransactionLimitMessage1)
        mutableTransactionLimitMessage.append(transactionLimitMessageInBold)
        mutableTransactionLimitMessage.append(mutableTransactionLimitMessage2)
        
        transactionLimit.attributedText = mutableTransactionLimitMessage
    }
    
    @IBAction func buttonSavedMoney(_ sender: Any) {
        
        guard let navController = self.navigationController else { return }
        
        let popOverVC = UIStoryboard(name: "RecipientListViewController", bundle: nil).instantiateViewController(withIdentifier: "savingPopup") as! PopUpSavingViewController
        navController.addChildViewController(popOverVC)
        popOverVC.view.frame = navController.view.bounds
        navController.view.addSubview(popOverVC.view)
        popOverVC.didMove(toParentViewController: navController)
    }
    
    /**
     Add done and cancel button
     */
    func addDoneButtonOnKeyboard()
    {
        let doneToolbar: UIToolbar = UIToolbar(frame: CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
        doneToolbar.barStyle = .default
        
        let flexSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        let done: UIBarButtonItem = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(self.doneButtonAction))
        done.tintColor = UIColor(hex: 0xED1C24)
        
        let cancel: UIBarButtonItem = UIBarButtonItem(title: "Cancel", style: .done, target: self, action: #selector(self.cancelAction))
        cancel.tintColor = UIColor.black
        
        
        let items = [cancel, flexSpace, done]
        doneToolbar.items = items
        doneToolbar.sizeToFit()
        
        self.textFieldKRW.inputAccessoryView = doneToolbar
        self.textFieldNPR.inputAccessoryView = doneToolbar
    }
    
    /**
     Add cancel button in keypad
     */
    @objc func cancelAction()
    {
        textFieldKRW.text = ""
        textFieldNPR.text = ""
        serviceFeeLabel.text = "Exchange Rate:"
        labelExchangeRate.text = "Service Fee:"
        rewardPointlabel.text = ""
        textFieldNPR.resignFirstResponder()
        textFieldKRW.resignFirstResponder()
        pickerViewCurrency.isHidden = true
        if !buttomCurrencyStatus! {
            buttomCurrencyStatus! = !buttomCurrencyStatus!
        }
    }
    
    /**
     Picker view done action button
     */
    @objc func doneButtonAction()
    {
        self.networkDialogShown = false
        textFieldKRW.resignFirstResponder()
        textFieldNPR.resignFirstResponder()
        
        guard textFieldNPR.text != "" || textFieldKRW.text != ""  else {
            self.popUpMessageInfo(value: 16, title: "Missing amount", message: "Please enter amount")
            return
        }
        viewContentMain.isHidden = true
        self.startLoading()
        transactionviewmodel.fetchExchangeRate(exchangeData: exchangeData!)
    }
    
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        if segue.identifier == "reviewTransfer" {
            let reviewViewController
                = segue.destination as! ReviewViewController
            
            //ADDED FOR HOMEDELIVERY
            if paymentMode! == paymentModeType.homeDelivery.rawValue {
                if let localRecipient = recipient, let localCalculateBy = calculateBy , let localHomeDetails = homeDetails{
                    reviewViewController.transferDetails = transactionviewmodel.getTransferDetailsForHomeDelivery(recipient: localRecipient, paymentMethodId: getPaymentMethodId(), calcBy: localCalculateBy, homeDetails: localHomeDetails)
                }
            } else {
                if let localRecipient = recipient, let localCalculateBy = calculateBy{
                    reviewViewController.transferDetails = transactionviewmodel.getTransferDetails(recipient: localRecipient, paymentMethodId: getPaymentMethodId(), calcBy: localCalculateBy)
                }
            }
            reviewViewController.recipient = recipient
            reviewViewController.paymentMode = self.paymentMode
        }
    }
}

extension RecipientTranscationViewController: UITextFieldDelegate {
    
    func textFieldDidBeginEditing(_ textField: UITextField) {
        addDoneButtonOnKeyboard()
        buttonSave.isUserInteractionEnabled = false
        buttonSave.alpha = 0.3
        
        if textField == textFieldKRW {
            textFieldNPR.text = ""
        } else {
            textFieldKRW.text = ""
        }
        checkScroll()
    }
    
    func textFieldDidEndEditing(_ textField: UITextField) {
        
        checkScroll()
        
        if textField == textFieldKRW {
            
            calculateBy = "C"
            if let countryId = recipient?.countryId{
                exchangeData = ["from":"KRW",
                                "to":labelCurrency.text!,
                                "calcBy": calculateBy!,
                                "cAmt": textFieldKRW.text!,
                                "payoutmethodid": getPaymentMethodId(),
                                "countryId":countryId,
                                "sendMoney":true
                ]
            }
            
        } else {
            if let countryId = recipient?.countryId{
                calculateBy = "P"
                exchangeData = ["from":"KRW",
                                "to":labelCurrency.text!,
                                "calcBy": calculateBy!,
                                "pAmt": textFieldNPR.text!,
                                "payoutmethodid": getPaymentMethodId(),
                                "countryId":countryId,
                                "sendMoney":true
                ]
            }
        }
        textFieldKRW.sizeToFit()
        textFieldNPR.sizeToFit()
    }
    
    func getWidth(text: String) -> CGFloat
    {
        let txtField = UITextField(frame: .zero)
        txtField.text = text
        txtField.sizeToFit()
        return txtField.frame.size.width
    }
    
    override open func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(true)
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString
        string: String) -> Bool {
        
        let inputText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
        
        let currentText = textField.text ?? ""
        guard let stringRange = Range(range, in: currentText) else { return false }
        
        let updatedText = currentText.replacingCharacters(in: stringRange, with: string)
        
        if updatedText.count != 0 {
            if textField == textFieldKRW {
                if inputText.isDouble() {
                    if Double(inputText)! <= transactionviewmodel.getTransferLimit() {
                        return true
                    } else {
                        return false
                    }
                }
                
            } else {
                if inputText.isDouble() {
                    if Double(inputText)! <= 999999999999999 {
                        return true
                    } else {
                        return false
                    }
                }
            }
        }
        return true
    }
}

extension RecipientTranscationViewController: UIPickerViewDelegate, UIPickerViewDataSource {
    
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return pickerData.count
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return pickerData[row]
    }
    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        
        let label = (view as? UILabel) ?? UILabel()
        
        label.textColor = UIColor(red:0.29, green:0.29, blue:0.29, alpha:1.0)
        label.textAlignment = .center
        label.font = UIFont.systemFont(ofSize: 18)
        
        label.text = pickerData[row]
        
        return label
    }
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        buttomCurrencyStatus = true
        pickerViewCurrency.isHidden = true
        dropDownCountryButton.setTitle(pickerData[row] + "  ", for: UIControlState.normal)
        labelCurrency.text = pickerData[row]
        
        if textFieldKRW.text != "" && textFieldNPR.text != "" {
            textFieldNPR.text = ""
            buttonSave.isUserInteractionEnabled = false
            buttonSave.alpha = 0.3
            
        }
    }
}

extension RecipientTranscationViewController : ScrollableProtocol {
    var offset: CGFloat {
        get {
            return 160
        }
    }
    
    var viewScrolled: Bool {
        get {
            return isScrolled
        }
    }
    
    func checkScroll() {
        
        if !viewScrolled {
            performScroll(direction: 0)
            isScrolled = !isScrolled
        } else {
            performScroll(direction: 1)
            isScrolled = !isScrolled
        }
    }
    
    func registerTapListener() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(clearKeyboard))
        view.addGestureRecognizer(tap)
    }
    
    @objc func clearKeyboard() {
        textFieldKRW.resignFirstResponder()
        textFieldNPR.resignFirstResponder()
        
        if viewScrolled {
            performScroll(direction: 1)
            isScrolled = !isScrolled
        }
    }
    
    func performScroll(direction: Int) {
        if direction == 0 {
            UIView.animate(withDuration: 0.3, animations: {
                self.view.frame = self.view.frame.offsetBy(dx: 0, dy: self.offset * -1)
            })
        } else if direction == 1 {
            UIView.animate(withDuration: 0.3, animations: {
                self.view.frame = self.view.frame.offsetBy(dx: 0, dy: self.offset)
            })
        }
    }
}

extension String {
    func isDouble() -> Bool {
        
        if let doubleValue = Double(self) {
            
            if doubleValue >= 0 {
                return true
            }
        }
        
        return false
    }
}