//
//  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"
  case cardPayment = "14"
}

class ExchangeRatesViewController: UIViewController {
  
  struct Constants {
    let transferFeeDetailText = StringConstants().transferFeeDetailText
    let currentExchangeRateText =  StringConstants().currentExchangeRateText
    let paymentModeHeightConstant: CGFloat = 154
    let title = StringConstants().title
  }
  
  struct StringConstants {
    let selectPaymentModeText = ""
    let youSendText = "you_send_text".localized()
    let recepientGetsText = "receipient_gets_text".localized()
    let calculate = "calculate_text".localized()
    let title = "todays_rate_text".localized()
    let currentExchangeRateText = "current_exchange_rate_text".localized()
    let transferFeeDetailText = "transfer_fee_included_text".localized()
  }
  
  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: GMENumberTextField!
  @IBOutlet weak var reciepientTextField: GMENumberTextField!
  
  @IBOutlet weak var transferFeeInfoLabel: UILabel!
  @IBOutlet weak var exchangeRateInfoLabel: UILabel!
  @IBOutlet private weak var forUnitToKoreanLabel: UILabel!
  
  @IBOutlet weak var youSendTitleLabel: UILabel!
  @IBOutlet weak var recepientGetsTitleLabel: UILabel!
  @IBOutlet weak var selectPaymentModeTitleLabel: UILabel!
  @IBOutlet weak var executeButton: UIButton!
  
  @IBOutlet weak var calculatedInfoView: UIView!
  @IBOutlet weak var serviceChargeView: UIStackView!
  @IBOutlet weak var exchangeRateView: UIStackView!
  
  var presenter: ExchangeRatesModuleInterface?
  var countryListTapGuesture: UITapGestureRecognizer?
  var selectedPaymentModeIndex = 0
  var translated: Bool = false
  var nativeCountryCode: String? = "np"
  
  var calcBy = ""
  
  private var exchangeRateModels: [ExchangeRateModel]? {
    didSet {
      let countryCode = GMEDB.shared.user.string(.countryCode)
      
      if let defaultExchangeRate = exchangeRateModels?.filter({
        ($0.countryCode ?? "").lowercased() == countryCode?.lowercased()
      }).first {
        selectedExchangeRateModel = defaultExchangeRate
      } else {
        selectedExchangeRateModel = exchangeRateModels?.filter({
          ($0.countryCode ?? "").lowercased() == "az"
        }).first
      }
    }
  }
  
  private var selectedExchangeRateModel: ExchangeRateModel? {
    didSet {
      collectionView.reloadData()
      
      let code =  selectedExchangeRateModel?.countryCode?.lowercased() ?? "az"
      let codeEnum = CountryEnum(rawValue: code)
      
      countryFlagImage.image = codeEnum?.flag
      countryCodeLabel.text = selectedExchangeRateModel?.currency
      
      guard let defaultAmount = codeEnum?.getDefaultRecipientAcount(
        currency: selectedExchangeRateModel?.currency ?? ""
        ) else {
          calcBy = "c"
          senderTextField.text = codeEnum?.defaultSenderAmount.likeCommaMoney()
          reciepientTextField.text = ""
          calculateExchangeRate()
          return
      }
      calcBy = "p"
      senderTextField.text = ""
      reciepientTextField.text = defaultAmount.likeCommaMoney()
      
      calculateExchangeRate()
      
    }
  }
  
  private var exchangeRateDetailModel: ExchangeRateDetailModel? {
    didSet {
      guard let model = exchangeRateDetailModel else {
        showExchangeRateInfomation(isHidden: true)
        return
      }
      
      showExchangeRateInfomation(isHidden: false)
      
      reciepientTextField.text = Utility.getCommaSeperatedStringWithDecimal(
        numberString: model.recipientAmount ?? ""
      )
      senderTextField.text = Utility.getCommaSeperatedStringWithDecimal(
        numberString: model.senderAmount ?? ""
      )
      
      let transferFee = model.transferFee ?? ""
      let currency = model.senderCurrency ?? ""
      
      transferFeeInfoLabel.text =
        "-\(transferFee) \(currency) (" + "transfer_fee_included_text".localized() + ")"
      
      let exchangeRate = model.exchangeRate ?? ""
      exchangeRateInfoLabel.text = "\(exchangeRate)  " + "("  + "current_exchange_rate_text".localized() + ")"
      calculatedInfoView.isHidden = false
      
      guard let intExchangeRate = Double(exchangeRate) else { return }
      let calculatedForUnit = (1/intExchangeRate)
      let roundedForUnit = round((calculatedForUnit) * 10) / 10
      
      let translated = "current_exchange_rate_text".localized()
      forUnitToKoreanLabel.text = "\(translated) : 1 \(selectedExchangeRateModel?.currency ?? "") = \(roundedForUnit) KRW"
      forUnitToKoreanLabel.layer.cornerRadius = 5
      forUnitToKoreanLabel.layer.borderWidth = 1
      forUnitToKoreanLabel.layer.borderColor = UIColor.themeSubBackground.cgColor
    }
  }
  
  // MARK: VC's Life cycle
  override func viewDidLoad() {
    super.viewDidLoad()
    setup()
    setupDelegates()
    setupNavigation()
    
    self.nativeCountryCode = GMEDB.shared.user.string(.countryCode)
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.title = Constants().title
    presenter?.fetchExchangeRate()
  }
  
  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    self.view.endEditing(true)
  }
  // IBActions
  
  @IBAction func calculateExchangeRate(_ sender: Any?) {
    calculateExchangeRate()
  }

  private func calculateExchangeRate() {
    let model = ExchangeRateRequestModel(
      senderAmount: (senderTextField.text ?? "").stringRemovingComma(),
      senderCurrency: "KRW",
      senderCountryID: "118",
      recipientAmount: (reciepientTextField.text ?? "").stringRemovingComma(),
      recipientCurrency: selectedExchangeRateModel?.currency ?? "",
      recipientCountryID: selectedExchangeRateModel?.countryId ?? "",
      recipientCountry: selectedExchangeRateModel?.country ?? "",
      serviceType: selectedExchangeRateModel?
        .availableServices?
        .elementAt(index: selectedPaymentModeIndex)?.id ?? "",
      calcBy: calcBy
    )
    
    presenter?.exchangeCalculate(use: model)
  }
  
  @objc func showCountryList(_ sender: UITapGestureRecognizer) {
    DispatchQueue.main.async {
      self.reciepientTextField.resignFirstResponder()
      self.senderTextField.resignFirstResponder()
    }
    
    TablePresenterWireframe().openWith(
      delegate: self,
      model: exchangeRateModels,
      source: self
    )
    
  }
  
  // other function
  
  private func setExchangeRateUI() {
    [backgroundViewCountryLabel1, backgroundViewCountryLabel2]
      .forEach { $0?.layer.cornerRadius = 5 }
    
    [exchangeBackground1, exchangeBackground2]
      .forEach {
        $0?.layer.borderWidth = 1
        $0?.layer.borderColor = UIColor.themeSeparate.cgColor //init(hex: "#E0E0E0").cgColor
        $0?.layer.cornerRadius = 5
    }
    
    let dropDownImage = #imageLiteral(resourceName: "dropdown_white").withRenderingMode(UIImage.RenderingMode.alwaysTemplate)
    let image = dropDownImage
    
    dropDownImageView.image = image
    dropDownImageView.tintColor = UIColor.white
    
    senderTextField.delegate = self
    reciepientTextField.delegate = self
  }
  
  private func showExchangeRateInfomation(isHidden flag: Bool) {
    calculatedInfoView.isHidden = flag
    calculatedInfoView.alpha = flag ? 0.0 : 1.0
    
    if !flag {
      self.serviceChargeView.isHidden = false
      self.exchangeRateView.isHidden = false
      
      let animator = UIViewPropertyAnimator(duration: 0.5, curve: .easeIn) {
        self.serviceChargeView.alpha = 1.0
      }
      animator.addCompletion { _ in
        let subAnimator = UIViewPropertyAnimator(duration: 0.5, curve: .easeIn) {
          self.exchangeRateView.alpha = 1.0
        }
        subAnimator.startAnimation()
      }
      animator.startAnimation()
      
    } else {
      serviceChargeView.isHidden = true
      serviceChargeView.alpha = 0.0
      exchangeRateView.isHidden = true
      exchangeRateView.alpha = 0.0
    }
    
  }
  
  func showPaymentModeView() {
    UIView.animate(withDuration: 0.33) {
      self.paymentModeStackViewConstraint.constant = Constants().paymentModeHeightConstant
      self.paymentModeStackView.alpha = 1
      self.view.layoutIfNeeded()
    }
  }
  
  private func setupTargets() {
    let tapGuesture = UITapGestureRecognizer(target: self, action: #selector(showCurrencyCountryPickerview))
    countryListStackView.addGestureRecognizer(tapGuesture)
    
    reciepientTextField.addTarget(
      self,
      action: #selector(self.textChanged(sender:)),
      for: UIControl.Event.editingChanged
    )
    
    senderTextField.addTarget(
      self,
      action: #selector(self.textChanged(sender:)),
      for: UIControl.Event.editingChanged
    )
  }
  
  @objc private func textChanged(sender: UITextField) {
    switch sender {
    case senderTextField:
      reciepientTextField.text = ""
      calcBy = "c"
      senderTextField.text = Utility.getCommaSeperatedString(numberString: senderTextField.text!)
    case reciepientTextField:
      senderTextField.text = ""
      calcBy = "p"
      reciepientTextField.text = Utility.getCommaSeperatedString(numberString: reciepientTextField.text!)
    default:
      break
    }
  }
  
  @objc private func showCurrencyCountryPickerview() {
    DispatchQueue.main.async {
      self.reciepientTextField.resignFirstResponder()
      self.senderTextField.resignFirstResponder()
    }
    
    TablePresenterWireframe().openWith(
      tag: 1,
      delegate: self,
      model: exchangeRateModels,
      source: self
    )
  }
  
  private func setupDelegates() {
    self.collectionView.delegate = self
    self.collectionView.dataSource = self
  }
  
  private func setup() {
    setupLanguage()
    
    setupTargets()
    setExchangeRateUI()
    showExchangeRateInfomation(isHidden: true)
    
    executeButton.layer.cornerRadius = 5
    executeButton.backgroundColor = .themeRed
    senderTextField.textColor = .themeRed
    reciepientTextField.textColor = .themeRed
    
    backgroundViewCountryLabel1.backgroundColor = .themeBlue
    backgroundViewCountryLabel2.backgroundColor = .themeBlue
    forUnitToKoreanLabel.adjustsFontSizeToFitWidth = true
  }
  
  private func setupLanguage() {
    let constant = StringConstants()
    self.youSendTitleLabel.text = constant.youSendText
    self.recepientGetsTitleLabel.text = constant.recepientGetsText
    self.selectPaymentModeTitleLabel.text = "select_payment_mode_text".localized()
    self.executeButton.setTitle(constant.calculate, for: UIControl.State.normal)
  }
  
  private func setupNavigation() {
    self.setupNormalNavigation()
  }
}
extension ExchangeRatesViewController: UICollectionViewDelegate {
  func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    self.selectedPaymentModeIndex = indexPath.row
    self.collectionView.reloadData()
    self.calculateExchangeRate(nil)
  }
}

extension ExchangeRatesViewController: UICollectionViewDataSource {
  func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return self.selectedExchangeRateModel?.availableServices?.count ?? 0
  }
  
  func collectionView(
    _ collectionView: UICollectionView,
    cellForItemAt indexPath: IndexPath
    ) -> UICollectionViewCell {
    let service = self.selectedExchangeRateModel?.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)
    case .cardPayment:
      return configureCardPaymentCell(collectionView: collectionView, indexPath: indexPath)
      
    }
    
  }
  
  func configureBankDepositeCell(
    collectionView: UICollectionView,
    indexPath: IndexPath
    ) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(
      withReuseIdentifier: "ExchangeRateCollectionViewCell",
      for: indexPath
      ) as? ExchangeRateCollectionViewCell else {
        return UICollectionViewCell()
    }
    
    cell.cellSelected = self.selectedPaymentModeIndex == indexPath.row
    cell.paymentServiceMethod = self.selectedExchangeRateModel?.availableServices?.elementAt(
      index: indexPath.row
    )
    
    cell.image = #imageLiteral(resourceName: "ic_bank")
    cell.setup()
    return cell
  }
  
  func configureCardPaymentCell(
    collectionView: UICollectionView,
    indexPath: IndexPath
    ) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(
      withReuseIdentifier: "ExchangeRateCollectionViewCell",
      for: indexPath
      ) as? ExchangeRateCollectionViewCell else {
        return UICollectionViewCell()
    }
    
    cell.cellSelected = self.selectedPaymentModeIndex == indexPath.row
    cell.paymentServiceMethod = self.selectedExchangeRateModel?.availableServices?.elementAt(
      index: indexPath.row
    )
    
    cell.image = #imageLiteral(resourceName: "ic_card_payment")
    cell.setup()
    return cell
  }
  
  func configureWalletDeliveryCell(
    collectionView: UICollectionView,
    indexPath: IndexPath
    ) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(
      withReuseIdentifier: "ExchangeRateCollectionViewCell",
      for: indexPath
      ) as? ExchangeRateCollectionViewCell else {
        return UICollectionViewCell()
    }
    
    cell.cellSelected = self.selectedPaymentModeIndex == indexPath.row
    cell.paymentServiceMethod = self.selectedExchangeRateModel?.availableServices?.elementAt(
      index: indexPath.row
    )
    
    cell.image = #imageLiteral(resourceName: "wallet-transfer")
    cell.setup()
    return cell
  }
  
  func configureCashDeliveryCell(
    collectionView: UICollectionView,
    indexPath: IndexPath
    ) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(
      withReuseIdentifier: "ExchangeRateCollectionViewCell",
      for: indexPath
      ) as? ExchangeRateCollectionViewCell else {
        return UICollectionViewCell()
    }
    
    cell.cellSelected = self.selectedPaymentModeIndex == indexPath.row
    cell.paymentServiceMethod = self.selectedExchangeRateModel?.availableServices?.elementAt(
      index: indexPath.row
    )
    cell.image = #imageLiteral(resourceName: "ic_cash")
    cell.setup()
    return cell
  }
  
  func configureHomeDeliveryCell(
    collectionView: UICollectionView,
    indexPath: IndexPath
    ) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(
      withReuseIdentifier: "ExchangeRateCollectionViewCell",
      for: indexPath
      ) as? ExchangeRateCollectionViewCell else {
        return UICollectionViewCell()
    }
    cell.cellSelected = self.selectedPaymentModeIndex == indexPath.row
    cell.paymentServiceMethod = self.selectedExchangeRateModel?.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 {
  func setModel(with model: [ExchangeRateModel]?) {
    exchangeRateModels = model
  }
  
  func setModel(with model: ExchangeRateDetailModel?) {
    exchangeRateDetailModel = model
  }
  
  func setError(with error: Error) {
    if (error as NSError).code == -99 {
      alert(
        type: .error,
        message: error.localizedDescription,
        rightButtomTitle: "retry_text".localized(),
        okAction: {
          self.presenter?.fetchExchangeRate()
      }
      )
      return
    }
    
    alert(type: .error, message: error.localizedDescription)
  }
  
  func showLoading() {
    showProgressHud()
  }
  
  func hideLoading() {
    hideProgressHud()
  }
}

// MARK: - TablePresenterDelegate
extension ExchangeRatesViewController: TablePresenterDelegate {
  func tablePresenterView(_ viewController: TablePresenterViewController) -> TablePresenterConfiguration {
    return TablePresenterConfiguration(
      presenterTitle: "search_currency_text".localized(),
      closeButtonTitle: "cancel_text".localized(),
      notFoundTitle: "no_result_found_text".localized(),
      searchBarPlaceHolder: "search_currency_text".localized()
    )
  }
  
  func tablePresenterView(
    _ viewController: TablePresenterViewController,
    didSelectModel model: TablePresenterProtocol?
    ) {
    showExchangeRateInfomation(isHidden: true)
    selectedPaymentModeIndex = 0
    selectedExchangeRateModel = (model as? ExchangeRateModel) ?? selectedExchangeRateModel
  }
}