LONDON-IOS/GMERemittance/Module/ExchangeRates/User Interface/View/ExchangeRatesViewController.swift

//
//  ExchangeRatesViewController.swift
//  GMERemittance
//
//  Created by gme_2 on 24/08/2018.
//Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import Hex



enum PaymentMode: String {
    case cashDelivery = "1"
    case bankDeposite = "2"
    case homeDelivery = "12"
    case mobileWallet = "13"
}



class ExchangeRatesViewController: UIViewController {
    
    struct Constants {
        static let transferFeeDetailText = StringConstants().transferFeeDetailText
        static let currentExchangeRateText =  StringConstants().currentExchangeRateText
        static let paymentModeHeightConstant: CGFloat = 154
        static let title = StringConstants().title
    }
    
    struct StringConstants {
        let selectPaymentModeText = ""
        let youSendText = "you_send_text"
        let recepientGetsText = "receipient_gets_text"
        let calculate = "calculate_text"
        let title = "todays_rate_text"
        let currentExchangeRateText = "current_exchange_rate_text"
        let transferFeeDetailText = "transfer_fee_included_text"
    }
    
    struct ApiConstants {
        static let recieverCountryId = "pCountry"
        static let senderCurrency = "sCurrency"
        static let recieverCurrency = "pCurrency"
        static let senderAmount = "cAmount"
        static let recieverAmount = "pAmount"
        static let paymentMethod =  "serviceType"
        static let calcBy = "calcBy"
        static let recieverCountryName = "pCountryName"
        static let senderCountryId = "sCountry"
    }
    
    // MARK: IBOutlets
    
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var collectionView: UICollectionView!
    @IBOutlet weak var exchangeBackground1: UIView!
    @IBOutlet weak var exchangeBackground2: UIView!
    @IBOutlet weak var dropDownImageView: UIImageView!
    @IBOutlet weak var backgroundViewCountryLabel1: UIView!
    @IBOutlet weak var backgroundViewCountryLabel2: UIView!
    @IBOutlet weak var countryListStackView: UIStackView!
    @IBOutlet weak var countryCodeLabel: UILabel!
    @IBOutlet weak var countryFlagImage: UIImageView!
    
    @IBOutlet weak var paymentModeStackViewConstraint: NSLayoutConstraint!
    @IBOutlet weak var paymentModeStackView: UIStackView!
    
    @IBOutlet weak var senderTextField: UITextField!
    @IBOutlet weak var reciepientTextField: UITextField!
    
    @IBOutlet weak var transferFeeInfoLabel: UILabel!
    @IBOutlet weak var exchangeRateInfoLabel: UILabel!
    
    @IBOutlet weak var youSendTitleLabel: UILabel!
    @IBOutlet weak var recepientGetsTitleLabel: UILabel!
    @IBOutlet weak var selectPaymentModeTitleLabel: UILabel!
    @IBOutlet weak var calculateTItleLabel: UIButton!
    
    var presenter: ExchangeRatesModuleInterface?
    var countryListTapGuesture: UITapGestureRecognizer?
    var selectedPaymentIndex: IndexPath = IndexPath.init(row: 0, section: 0)
    var translated: Bool = false
    var nativeCountryCode: String? = "np"
    
    var calcBy = ""
    
    var exchangeRateModels: [ExchangeRateModel]? {
        didSet {
            
            
            if let _ = CountryInfo().defaultCountryCodes.filter({$0.lowercased() == (self.nativeCountryCode ?? "").lowercased()}).first  {
                if let defaultExchangeRate = self.exchangeRateModels?.filter({
                    ($0.countryCode ?? "").lowercased() == (self.nativeCountryCode ?? "").lowercased()
                }).first {
                    // there is native country, defaultExchangeRate is the information for that country
                    self.setCountryFlag(countryCode: defaultExchangeRate.countryCode ?? "")
                    self.setCurrencyLabel(currency: defaultExchangeRate.currency ?? "")
                    // set the default amount for this country. there are some default values in CountryInfo
                    self.selectedExchageRateModel = defaultExchangeRate
                    self.collectionView.reloadData()
                    showPaymentModeView()
                    self.populateDefaultAmounts()
                    
                }
            } else {
                self.setDefaultValuesForCountriesNotHavingDefaultValue()
                showPaymentModeView()
            }
            
            
        }
    }
    
    var selectedExchageRateModel: ExchangeRateModel? {
        didSet {
            self.setCurrencyLabel(currency: self.selectedExchageRateModel?.currency ?? "")
            self.setCountryFlag(countryCode: self.selectedExchageRateModel?.countryCode ?? "")
            collectionView.reloadData()
            DispatchQueue.main.async {
                self.reciepientTextField.resignFirstResponder()
                self.senderTextField.resignFirstResponder()
            }
        }
    }
    
    
    
    // MARK: VC's Life cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        setup()
        setupDelegates()
        setupTargets()
        setupNavigation()
        setupDefaultCountryFlagandCurrency()
        // todo: show default native country and falg
        // Do any additional setup after loading the view.
        //        populateDefaultAmounts()
        fetchExchangeRateInformation()
    }
    
    func setupDefaultCountryFlagandCurrency() {
        if let defaultExchangeRate = self.exchangeRateModels?.filter({
            ($0.country ?? "").lowercased() == (self.nativeCountryCode ?? "").lowercased()
        }).first {
            // there is native country, defaultExchangeRate is the information for that country
            self.setCountryFlag(countryCode: defaultExchangeRate.countryCode ?? "")
            self.setCurrencyLabel(currency: defaultExchangeRate.currency ?? "")
        }
    }
    
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.title = Constants.title
    }
    
    
    // IBActions
    
    @IBAction func calculateExchangeRate(_ sender: Any?) {
        let senderAmount = self.senderTextField.text!
        let reciepientAmount = self.reciepientTextField.text!
        let recipientCurrency = self.selectedExchageRateModel?.currency
        let reciepientCountryId = self.selectedExchageRateModel?.countryId
        let paymentMethod = self.selectedExchageRateModel?.availableServices?.elementAt(index: selectedPaymentIndex.row)
        let reciepientCountryName = self.selectedExchageRateModel?.country
        self.calculate(senderAmt: senderAmount, recieverAmt: reciepientAmount, recieverCurrency: recipientCurrency, recieverCountryName: reciepientCountryName, recieverCountryId: reciepientCountryId, paymentMethod: paymentMethod?.id, calcBy: self.calcBy)
        // call calculate( ... ) function
        // todo send to api for calculation
        
    }
    
    func calculate(senderAmt: String?, senderCurrency: String? = "KRW", recieverAmt: String?, recieverCurrency: String?, recieverCountryName: String?, recieverCountryId: String?, paymentMethod: String?, calcBy: String?, senderCountryId: String? = "118", shouldShowLoading: Bool = true ) {
        
        let param: [String: String] =
            [
                ApiConstants.senderAmount : senderAmt ?? "",
                ApiConstants.senderCurrency : senderCurrency ?? "",
                ApiConstants.recieverAmount : recieverAmt ?? "",
                ApiConstants.recieverCurrency : recieverCurrency ?? "",
                ApiConstants.recieverCountryId : recieverCountryId ?? "",
                ApiConstants.paymentMethod: paymentMethod ?? "",
                ApiConstants.calcBy : calcBy ?? "",
                ApiConstants.senderCountryId : senderCountryId ?? "",
                ApiConstants.recieverCountryName: recieverCountryName ?? ""
        ]
        //        print(param)
        // todo
        
        if shouldShowLoading { self.showProgressHud() }
        self.getExchangeRateInformation(params: param, success: { (exchageRateDetail) in
            
            self.reciepientTextField.text = Utility.getCommaSeperatedStringWithDecimal(numberString: exchageRateDetail?.recipientAmount ?? "")
            self.senderTextField.text = Utility.getCommaSeperatedStringWithDecimal(numberString: exchageRateDetail?.senderAmount ?? "")
            self.calcBy = "c"
            let transferFee = exchageRateDetail?.transferFee ?? ""
            let currency = exchageRateDetail?.senderCurrency ?? ""
            
            self.transferFeeInfoLabel.text = "\(transferFee) \(currency) (\(Constants.transferFeeDetailText))"
            
            let exchangeRate = exchageRateDetail?.exchangeRate ?? ""
            self.exchangeRateInfoLabel.text = "\(exchangeRate) (\(Constants.currentExchangeRateText))"
            self.hideProgressHud()
        }) { (error) in
            self.hideProgressHud()
            self.view.endEditing(true)
            self.alert(message: error.localizedDescription)
        }
        
        // call api with these params
    }
    
    
    @objc func showCountryList(_ sender: UITapGestureRecognizer) {
        DispatchQueue.main.async {
            self.reciepientTextField.resignFirstResponder()
            self.senderTextField.resignFirstResponder()
        }
        let viewcontroller = UIStoryboard.init(name: "TableViewPicker", bundle: nil).instantiateViewController(withIdentifier: "TablePickerViewController") as! TablePickerViewController
        viewcontroller.data = self.exchangeRateModels ?? []
        viewcontroller.type = TablePickerViewTitle.currency
        viewcontroller.doneAction = self.countrySelected
        //        viewcontroller.defaultSelectedData = [self.selectedExchageRateModel]
        self.present(viewcontroller, animated: true, completion: nil)
    }
    
    
    // other function
    
    func showPaymentModeView() {
        UIView.animate(withDuration: 0.33) {
            self.paymentModeStackViewConstraint.constant = Constants.paymentModeHeightConstant
            self.paymentModeStackView.alpha = 1
            self.view.layoutIfNeeded()
        }
    }
    
    func countrySelected(model: [ExchangeRateModel]) {
        self.selectedExchageRateModel = model.first
        
        guard let exchangeModel = self.selectedExchageRateModel else {return}
        guard   let recievingCountryId = exchangeModel.countryId else {return}
        guard let paymentMethod = exchangeModel.availableServices?.elementAt(index: selectedPaymentIndex.row) else {return}
        
        if let recievingAmount =  CountryInfo().getDefaultSendingAmount(for: selectedExchageRateModel?.countryCode ?? "") {
            if CountryInfo().doesCountryCodeHasDefined(country: exchangeModel.countryCode ?? "", currency: exchangeModel.currency ?? "") {
                if let recievingCurrency = CountryInfo().getDefaultSendingCurrency(for: exchangeModel.countryCode ?? "")
                {
                    // do something if you have to do
                    self.calcBy = "p"
                    self.reciepientTextField.text = Utility.getCommaSeperatedStringWithDecimal(numberString: recievingAmount)
                    let reciepientCountryName = exchangeModel.country
                    self.calculate(senderAmt: nil, senderCurrency: "KRW", recieverAmt: recievingAmount, recieverCurrency: recievingCurrency, recieverCountryName: reciepientCountryName, recieverCountryId: recievingCountryId, paymentMethod: paymentMethod.id, calcBy: calcBy, shouldShowLoading: false)
                    return
                }
            }
            
        }
        
        // for countries having two currency like vn "VND" and "USD", mongolia, mn nad srilanka, lk
        if let recievingAmount =  CountryInfo().getSecondarySendingAmount(for: exchangeModel.countryCode ?? "") {
            let recievingCurrency =  exchangeModel.currency  ?? ""
                if CountryInfo().doesSecondaryOptiopsHasDefined(country: exchangeModel.countryCode ?? "" , currency: recievingCurrency)
                {
                    // do something if you have to do
                    
                    self.calcBy = "p"
                    self.reciepientTextField.text = Utility.getCommaSeperatedStringWithDecimal(numberString: recievingAmount)
                    let reciepientCountryName = exchangeModel.country
                    self.calculate(senderAmt: nil, senderCurrency: "KRW", recieverAmt: recievingAmount, recieverCurrency: recievingCurrency, recieverCountryName: reciepientCountryName, recieverCountryId: recievingCountryId, paymentMethod: paymentMethod.id, calcBy: calcBy, shouldShowLoading: false)
                    return
                }
            }
            
         self.calculateExchangeRate(nil)
        // show country with flag.
    }
    
    
    @objc private func textChanged(sender: UITextField) {
        switch sender {
        case senderTextField:
            self.reciepientTextField.text = ""
            self.calcBy = "c"
            senderTextField.text = Utility.getCommaSeperatedString(numberString: senderTextField.text!)
        case reciepientTextField:
            
            self.senderTextField.text = ""
            self.calcBy = "p"
            reciepientTextField.text = Utility.getCommaSeperatedString(numberString: reciepientTextField.text!)
        default:
            break
        }
    }
    
    
    
    private func setCountryFlag(countryCode: String) {
        let flag = CountryInfo().getFlag(for: countryCode)
        self.countryFlagImage.image = flag
    }
    
    
    private func setCurrencyLabel(currency: String) {
        self.countryCodeLabel.text = currency.uppercased()
    }
    
    private func populateDefaultAmounts() {
        guard let nativeCountry = self.nativeCountryCode else {return}
        // todo: native country cha bhane tesko CountryInfo class ma defaullt value cha ki chaina herne
        //  CountryInfo class ma defaullt value cha bhane tyo value rakhera second api hit garna paryo ani aako data dekhaune
        // natra bhane tesko 1000000 kwr ko native ma kati huncha teti populate garaune
        
        guard let exchangeModel = self.exchangeRateModels?.filter({
            $0.countryCode?.lowercased() == nativeCountry.lowercased()  // countryCode
        }).first else {return}
        
        //        self.selectedExchageRateModel = exchangeModel
        
        
        // if there is no default amount, then we have to calculate from korean won. so guard ma rakhna thik nahola, yo case hereko chaina
        
        if let recievingAmount =  CountryInfo().getDefaultSendingAmount(for: exchangeModel.countryCode ?? "") {
            self.setDefaultValuesForCountriesHavingDefaultValue(recievingAmount: recievingAmount, exchangeModel: exchangeModel)
        }
        
        
    }
    
    private func setDefaultValuesForCountriesNotHavingDefaultValue() {
        self.selectedExchageRateModel = self.exchangeRateModels?.first
        let senderAmount = CountryInfo().getDefaultSendingMoneyInKoreanWon()
        self.senderTextField.text = Utility.getCommaSeperatedStringWithDecimal(numberString: senderAmount ?? "")
        let senderCurrency = "KWR"
        let recieverCurrency = self.selectedExchageRateModel?.currency
        let recieverCountryId = self.selectedExchageRateModel?.countryId
        let paymentMethod = self.selectedExchageRateModel?.availableServices?.elementAt(index: selectedPaymentIndex.row)
        let reciepientCountryName = self.selectedExchageRateModel?.country ?? ""
        let calcBy = "c"
        let senderCountryName = "KOREA"
        
        self.calculate(senderAmt: senderAmount, senderCurrency: senderCurrency, recieverAmt: nil, recieverCurrency: recieverCurrency, recieverCountryName: reciepientCountryName, recieverCountryId: recieverCountryId, paymentMethod: paymentMethod?.id, calcBy: calcBy, shouldShowLoading: false)
    }
    
    private func setDefaultValuesForCountriesHavingDefaultValue(recievingAmount: String, exchangeModel: ExchangeRateModel) {
        guard let recievingCurrency = CountryInfo().getDefaultSendingCurrency(for: exchangeModel.countryCode ?? ""),
            let recievingCountryId = exchangeModel.countryId,
            let paymentMethod = exchangeModel.availableServices?.elementAt(index: selectedPaymentIndex.row)
            else {
                // do something if you have to do
                return
        }
        self.calcBy = "p"
        self.reciepientTextField.text = Utility.getCommaSeperatedStringWithDecimal(numberString: recievingAmount)
        let reciepientCountryName = exchangeModel.country
        self.calculate(senderAmt: nil, senderCurrency: "KRW", recieverAmt: recievingAmount, recieverCurrency: recievingCurrency, recieverCountryName: reciepientCountryName, recieverCountryId: recievingCountryId, paymentMethod: paymentMethod.id, calcBy: calcBy, shouldShowLoading: false)
    }
    
    
    private func fetchExchangeRateInformation() {
        self.showProgressHud()
        self.fetchCountryCurrencyInfo(success: { (models) in
            self.exchangeRateModels = models
        }) { (error) in
            self.hideProgressHud()
            self.view.endEditing(true)
            self.alert(message: error.localizedDescription)
        }
    }
    
    private func setupTargets() {
        let tapGuesture = UITapGestureRecognizer(target: self, action: #selector(self.showCountryList(_:)))
        self.countryListTapGuesture = tapGuesture
        self.countryListStackView.addGestureRecognizer(self.countryListTapGuesture!)
        self.reciepientTextField.addTarget(self, action: #selector(self.textChanged(sender:)), for: UIControlEvents.editingChanged)
        self.senderTextField.addTarget(self, action: #selector(self.textChanged(sender:)), for: UIControlEvents.editingChanged)
        
        self.reciepientTextField.addTarget(self, action: #selector(self.textFieldSelected(sender:)), for: UIControlEvents.editingDidBegin)
        self.senderTextField.addTarget(self, action: #selector(self.textFieldSelected(sender:)), for: UIControlEvents.editingDidBegin)
        
    }
    
    @objc private func textFieldSelected(sender: UITextField) {
        switch sender {
        case senderTextField:
            if Utility.getDeviceModel() == .iphone678  {
                let x = self.scrollView.contentOffset.x
                let y = self.scrollView.contentOffset.y
                let newOffset = CGPoint.init(x: x, y: y + 100)
                scrollView.setContentOffset(newOffset, animated: true)
            }
            
            if Utility.getDeviceModel() == .iphone5 {
                let x = self.scrollView.contentOffset.x
                let y = self.scrollView.contentOffset.y
                let newOffset = CGPoint.init(x: x, y: y + 150)
                scrollView.setContentOffset(newOffset, animated: true)
            }
            
        case reciepientTextField:
            break
        default:
            break
        }
    }
    
    private func setupDelegates() {
        self.collectionView.delegate = self
        self.collectionView.dataSource = self
    }
    
    private func setup() {
        let dropDownImage = #imageLiteral(resourceName: "dropdown_white").withRenderingMode(UIImageRenderingMode.alwaysTemplate)
        let image = dropDownImage
        self.dropDownImageView.image = image
        self.dropDownImageView.tintColor = UIColor.white
        self.paymentModeStackViewConstraint.constant = 0
        self.paymentModeStackView.alpha = 0
        self.senderTextField.delegate = self
        self.reciepientTextField.delegate = self
        // corner Radius
        [backgroundViewCountryLabel1, backgroundViewCountryLabel2].forEach({
            $0?.layer.cornerRadius = 5
        })
        
        [exchangeBackground1, exchangeBackground2].forEach({
            $0?.layer.borderWidth = 1
            $0?.layer.borderColor = UIColor.init(hex: "#E0E0E0").cgColor
            $0?.layer.cornerRadius = 5
        })
        
        setupLanguage()
    }
    
    private func setupLanguage() {
        let constant = StringConstants()
        self.youSendTitleLabel.text = constant.youSendText
        self.recepientGetsTitleLabel.text = constant.recepientGetsText
        self.calculateTItleLabel.setTitle(constant.calculate, for: UIControlState.normal)
        
    }
    
    func show(error: String) {
        self.view.endEditing(true)
        self.alert(message: error)
    }
    
    func showLoading() {
        self.showProgressHud()
    }
    
    func hideLoading() {
        self.hideProgressHud()
    }
    
    
    
    private func setupNavigation() {
        self.setupNormalNavigation()
    }
}


extension ExchangeRatesViewController: UICollectionViewDelegate {
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
        let cell = collectionView.cellForItem(at: indexPath) as! ExchangeRateCollectionViewCell
        self.selectedPaymentIndex = indexPath
        self.collectionView.reloadData()
        self.calculateExchangeRate(nil)
    }
}

extension ExchangeRatesViewController: UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.selectedExchageRateModel?.availableServices?.count ?? 0
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let service = self.selectedExchageRateModel?.availableServices?.elementAt(index: indexPath.row)
        guard let index = PaymentMode.init(rawValue: service?.id ?? "") else {
            return UICollectionViewCell()
            
        }
        switch index {
        case .bankDeposite:
            return configureBankDepositeCell(collectionView: collectionView, indexPath: indexPath)
        case .cashDelivery:
            return configureCashDeliveryCell(collectionView: collectionView, indexPath: indexPath)
        case .homeDelivery:
            return configureHomeDeliveryCell(collectionView: collectionView, indexPath: indexPath)
            
        case .mobileWallet:
            return configureWalletDeliveryCell(collectionView: collectionView, indexPath: indexPath)
        }
    }
    
    func configureBankDepositeCell(collectionView: UICollectionView, indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ExchangeRateCollectionViewCell", for: indexPath) as! ExchangeRateCollectionViewCell
        cell.cellSelected = self.selectedPaymentIndex == indexPath
        cell.paymentServiceMethod = self.selectedExchageRateModel?.availableServices?.elementAt(index: indexPath.row)
        cell.image = #imageLiteral(resourceName: "ic_bank")
        cell.setup()
        return cell
    }
    
    func configureWalletDeliveryCell(collectionView: UICollectionView, indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ExchangeRateCollectionViewCell", for: indexPath) as! ExchangeRateCollectionViewCell
        cell.cellSelected = self.selectedPaymentIndex == indexPath
        cell.paymentServiceMethod = self.selectedExchageRateModel?.availableServices?.elementAt(index: indexPath.row)
        cell.image = #imageLiteral(resourceName: "wallet-transfer")
        cell.setup()
        return cell
    }
    
    func configureCashDeliveryCell(collectionView: UICollectionView, indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ExchangeRateCollectionViewCell", for: indexPath) as! ExchangeRateCollectionViewCell
        cell.cellSelected = self.selectedPaymentIndex == indexPath
        cell.paymentServiceMethod = self.selectedExchageRateModel?.availableServices?.elementAt(index: indexPath.row)
        cell.image = #imageLiteral(resourceName: "ic_cash")
        cell.setup()
        return cell
    }
    
    func configureHomeDeliveryCell(collectionView: UICollectionView, indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ExchangeRateCollectionViewCell", for: indexPath) as! ExchangeRateCollectionViewCell
        cell.cellSelected = self.selectedPaymentIndex == indexPath
        cell.paymentServiceMethod = self.selectedExchageRateModel?.availableServices?.elementAt(index: indexPath.row)
        cell.image = #imageLiteral(resourceName: "ic_homeDelivery")
        cell.setup()
        return cell
    }
}

extension ExchangeRatesViewController: FetchCountryCurrencyInformation, getExchangeRateInformation {}


extension ExchangeRatesViewController: UITextFieldDelegate {
    func textFieldDidEndEditing(_ textField: UITextField) {
        self.calculateExchangeRate(nil)
    }
}



// MARK: ExchangeRatesViewInterface
extension ExchangeRatesViewController: ExchangeRatesViewInterface {
    
}