//
//  SendMoneyExchangeRateViewController.swift
//  GMERemittance
//
//  Created by gme_2 on 28/08/2018.
//Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import Hero

class SendMoneyExchangeRateCurrencyViewModel {
  var countryCode: String?
  var currency: String?
}

extension SendMoneyExchangeRateCurrencyViewModel: TablePresenterProtocol {
  var cellTitle: String? {
    return currency
  }
  
  var cellImage: UIImage? {
    return CountryInfo().getFlag(for: countryCode ?? "")
  }
}

enum ActionBehaviour {
  case calculate
  case `continue`
}

protocol SelectCouponDelegate: class {
  
  func selectBoxView(
    _ viewController: SelectCouponViewController,
    didSelectModel model: CouponBoxModel?
  )
}

class SendMoneyExchangeRateViewController: UIViewController {
  
  private enum DiscountType: String {
    case percent = "1"
    case value = "2"
  }
  
  // MARK: IBOutlets
  
  @IBOutlet private weak var exchangeBackground1: UIView!
  @IBOutlet private weak var exchangeBackground2: UIView!
  @IBOutlet private weak var dropDownImageView: UIImageView!
  @IBOutlet private weak var backgroundViewCountryLabel1: UIView!
  @IBOutlet private weak var backgroundViewCountryLabel2: UIView!
  @IBOutlet private weak var countryListStackView: UIStackView!
  @IBOutlet private weak var countryCodeLabel: UILabel!
  @IBOutlet private weak var countryFlagImage: UIImageView!
  @IBOutlet private weak var continueButton: UIButton!
  @IBOutlet private weak var senderTextField: GMENumberTextField!
  @IBOutlet private weak var reciepientTextField: GMENumberTextField!
  @IBOutlet private weak var transferFeeInfoLabel: UILabel!
  @IBOutlet weak var appliedCouponStackView: UIStackView!
  @IBOutlet weak var appliedCouponFee: UILabel!
  @IBOutlet private weak var exchangeRateLabel: UILabel!
  @IBOutlet private weak var youSendTitleLabel: UILabel!
  @IBOutlet private weak var recipientGetsTitleLabel: UILabel!
  @IBOutlet private weak var couponBackgroundView: UIView!
  @IBOutlet private weak var couponNameTitleLabel: UILabel!
  @IBOutlet private weak var couponNameLabel: UILabel!
  @IBOutlet private weak var couponDropDownImageView: UIImageView!
  @IBOutlet private weak var realSenderView: UIView!
  @IBOutlet private weak var realSenderTitleLabel: UILabel!
  @IBOutlet private weak var realSenderLabel: UILabel!
  @IBOutlet weak var couponDetailView: UIStackView!
  
  @IBOutlet weak var calculatedInfoView: UIView!
  @IBOutlet weak var serviceChargeView: UIStackView!
  @IBOutlet weak var exchangeRateView: UIStackView!
  
  @IBOutlet weak var couponListFetch: UIView!
  @IBOutlet weak var couponListShow: UIStackView!
  
  // MARK: Properties
  var presenter: SendMoneyExchangeRateModuleInterface?
  var requestModel: SendMoneyRequestModel?
  weak var actionDelegate: SendMoneyExchangeRateActionDelegate?
  weak var selectedCouponDelegate: SelectCouponDelegate?
  var reciepient: Recipient?
  var netServiceFee: String?
  var couponSchemeId: String?
  private var applyDefaultCoupon: CouponBoxModel?
  
  private lazy var countryListTapGuesture: UITapGestureRecognizer = UITapGestureRecognizer()
  private lazy var couponListTapGesture: UITapGestureRecognizer = UITapGestureRecognizer()
  
  private var plainSendingAmount: String?
  
  private var action: ActionBehaviour? {
    didSet {
      if let action = self.action {
        switch action {
        case .calculate:
          continueButton.setTitle("calculate_text".localized(), for: .normal)
        case .continue:
          continueButton.setTitle("continue_text".localized(), for: .normal)
        }
      }
    }
  }
  
  private var couponInfo: [CouponBoxModel]? {
    didSet {
      if couponInfo?.count ?? 0 > 0 {
        let defaultApplyCoupon = couponInfo?.sorted(by: { (couponModel1, couponModel2) -> Bool in
          guard let date1 =  couponModel1.expireDate else { return true }
          guard let date2 = couponModel2.expireDate else { return false }
          return date1 > date2
        })
        applyDefaultCoupon = defaultApplyCoupon?.first
      }
    }
  }
  
  private var selectCoupon: CouponBoxModel?
  
  private var transferFeeCharge: ExchangeRateModel?
  
  private var currencyInfoViewModel: [SendMoneyExchangeRateCurrencyViewModel]? {
    didSet {
      selectedCurrencyViewModel =  currencyInfoViewModel?.first
    }
  }
  
  private var exchangeRateModel: SendMoneyExchangeRateModel? {
    didSet {
      guard let model = exchangeRateModel else {
        self.showExchangeRateInfomation(isHidden: true)
        return
      }
      
      reciepientTextField.text = Utility.getCommaSeperatedStringWithDecimal(
        numberString: model.recipientAmount ?? ""
      )
      
      senderTextField.text = Utility.getCommaSeperatedStringWithDecimal(
        numberString: model.senderAmount ?? ""
      )
      
      let serviceCharge = model.transferFee?.likeCommaMoney() ??
        model.transferFee ??
      "0.00"
      
      let transferFee = serviceCharge != "0.00" ? "-\(serviceCharge)" : "\(serviceCharge)"
      
      transferFeeInfoLabel.text = "\(transferFee) (\("transfer_fee_included_text".localized()))"
      exchangeRateLabel.text =
      "\(model.exchangeRate ?? "") (\("current_exchange_rate_text".localized()))"
      
      setCoupon()
      self.showExchangeRateInfomation(isHidden: false)
      
      action = .continue
    }
  }
  
  private var calcBy = ""
  private var isFirst = true
  private var currencies: [String]? {
    didSet {
      let models: [SendMoneyExchangeRateCurrencyViewModel] =
        (currencies ?? []).map {[weak self] in
          guard let `self` = self else {
            return SendMoneyExchangeRateCurrencyViewModel()
          }
          
          let viewmodel = SendMoneyExchangeRateCurrencyViewModel()
          viewmodel.countryCode = self.reciepient?.countryCode ?? ""
          viewmodel.currency = $0
          return viewmodel
      }
      currencyInfoViewModel = models
    }
  }
  
  var selectedCurrencyViewModel: SendMoneyExchangeRateCurrencyViewModel? {
    didSet {
      setCurrencyLabel(currency: selectedCurrencyViewModel?.currency ?? "")
      action = .calculate
    }
  }
  
  weak var hudDelegate: HUDStatusDelegate?
  
  // MARK: VC's Life cycle
  override func viewDidLoad() {
    super.viewDidLoad()
    setup()
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    configureViews()
    action = ActionBehaviour.calculate
    
    senderTextField.receiverNativeCountry = reciepient?.countryCode ?? ""
    reciepientTextField.receiverNativeCountry = reciepient?.countryCode ?? ""
    
    presenter?.fetchCoupons()
    
    sendingAmountChanged()
    
  }
  
  override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    
    if isFirst {
      self.senderTextField.becomeFirstResponder()
      self.isFirst = false
    }
    if couponNameLabel.text == "" {
      couponNameLabel.text = "\(couponInfo?.count ?? 0)"
    } else {
      
    }
  }
  
  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    view.endEditing(true)
  }
  
  // MARK: IBActions
  @IBAction private func continueButton(_ sender: UIButton) {
    view.endEditing(true)
    if let action = self.action {
      switch action {
      case .calculate:
        calculate()
      case .continue:
        goToVerification()
      }
    }
  }
  
  // MARK: Other Functions
  private func setup() {
    // all setup should be done here
    realSenderView.isHidden = true
    backgroundViewCountryLabel2.hero.id = reciepient?.receiverID
    backgroundViewCountryLabel2.hero.modifiers = [.translate()]
    
    setupTargets()
    action = .calculate
    senderTextField.delegate = self
    reciepientTextField.delegate = self
    
    calcBy = "c"
    [backgroundViewCountryLabel1, backgroundViewCountryLabel2].forEach { $0?.layer.cornerRadius = 5 }
    [exchangeBackground1, exchangeBackground2, couponBackgroundView].forEach {
      $0?.layer.borderWidth = 1
      $0?.layer.borderColor = UIColor.themeSeparate.cgColor
      // UIColor.init(hex: "#E0E0E0").cgColor
      $0?.layer.cornerRadius = 5
    }
    
    configureLanguage()
    
    continueButton.layer.cornerRadius = 5
    continueButton.backgroundColor = .themeRed
    continueButton.titleLabel?.font = .sanfrancisco(.medium, size: 18)
    
    senderTextField.textColor = .themeRed
    reciepientTextField.textColor = .themeRed
    realSenderLabel.textColor = .themeRed
    backgroundViewCountryLabel1.backgroundColor = .themeBlue
    backgroundViewCountryLabel2.backgroundColor = .themeBlue
  }
  
  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
      self.couponBackgroundView.isHidden = false
      
      let animator = UIViewPropertyAnimator(duration: 0.3, curve: .easeIn) {
        self.serviceChargeView.alpha = 1.0
      }
      animator.addCompletion { _ in
        let subAnimator = UIViewPropertyAnimator(duration: 0.3, curve: .easeIn) {
          self.exchangeRateView.alpha = 1.0
        }
        
        subAnimator.addCompletion { _ in
          let subSubAnimator = UIViewPropertyAnimator(duration: 0.2, curve: .easeIn) {
            self.couponBackgroundView.alpha = 1.0
          }
          subSubAnimator.startAnimation()
        }
        subAnimator.startAnimation()
      }
      animator.startAnimation()
      
    } else {
      serviceChargeView.isHidden = true
      serviceChargeView.alpha = 0.0
      
      exchangeRateView.isHidden = true
      exchangeRateView.alpha = 0.0
      
      couponBackgroundView.isHidden = true
      couponBackgroundView.alpha = 0.0
    }
    
  }
  
  private func setCoupon() {
    
    guard
      let selectedCoupon = applyDefaultCoupon,
      //      selectedCoupon.couponType == "1",
      let schemeId = selectedCoupon.schemeId,
      schemeId != "",
      let discountType = selectedCoupon.discountType,
      let type = DiscountType(rawValue: discountType),
      var discountValue = Double(selectedCoupon.discountValue ?? ""),
      let senderMoney = Double(senderTextField?.text?.stringRemovingComma() ?? ""),
      let serviceFee = Double(exchangeRateModel?.transferFee?.stringRemovingComma() ?? "")
      else {
        resetCouponandAppliedMoney()
        return
    }
    
    realSenderView.isHidden = false
    couponSchemeId = schemeId
    
    switch type {
    case .percent:
      discountValue = serviceFee * (discountValue / 100)
      couponNameLabel.text = "Service Discount \(selectedCoupon.discountValue ?? "0")%"
      
    case .value:
      couponNameLabel.text = "Service Discount \(selectedCoupon.discountValue ?? "0") KRW"
    }
    
    netServiceFee = "\(serviceFee - discountValue)".likeCommaMoney()
    realSenderLabel.text = "\(senderMoney - discountValue)".likeCommaMoney()
    
  }
  
  private func configureLanguage() {
    youSendTitleLabel.text = "you_send_text".localized()
    recipientGetsTitleLabel.text = "recepient_gets_text".localized()
    continueButton.setTitle("calculate_text".localized(), for: .normal)
  }
  
  private func setCountryFlag(countryCode: String) {
    let countryEnum = CountryEnum(rawValue: countryCode.lowercased())
    countryFlagImage.image = countryEnum?.flag
  }
  
  private func setCurrencyLabel(currency: String) {
    countryCodeLabel.text = currency.uppercased()
  }
  
  private func setupTargets() {
    let tapGuesture = UITapGestureRecognizer(target: self, action: #selector(showCountryList(_:)))
    countryListTapGuesture = tapGuesture
    countryListStackView.addGestureRecognizer(countryListTapGuesture)
    
    let couponTapGuesture = UITapGestureRecognizer(target: self, action: #selector(showCouponList(_:)))
    couponListTapGesture = couponTapGuesture
    couponListShow.addGestureRecognizer(couponListTapGesture)
    
    reciepientTextField.addTarget(
      self,
      action: #selector(textChanged(sender:)),
      for: UIControl.Event.editingChanged
    )
    senderTextField.addTarget(
      self,
      action: #selector(textChanged(sender:)),
      for: UIControl.Event.editingChanged
    )
  }
  
  @objc private func showCountryList(_ sender: UITapGestureRecognizer) {
    TablePresenterWireframe().openWith(
      delegate: self,
      model: currencyInfoViewModel,
      source: self
    )
  }
  
  @objc private func showCouponList(_ sender: UITapGestureRecognizer) {
    SelectCouponWireframe().openSelectCoupon(
      didSelect: selectCoupon,
      with: couponInfo,
      delegate: self,
      in: self
    )
  }
  
  private func configureViews() {
    exchangeRateModel = nil
    
    let dropDownImage = #imageLiteral(resourceName: "dropdown_white").withRenderingMode(UIImage.RenderingMode.alwaysTemplate)
    let image = dropDownImage
    
    dropDownImageView.image = image
    dropDownImageView.tintColor = UIColor.white
    setCountryFlag(countryCode: reciepient?.countryCode ?? "")
    let deliveryMethod = requestModel?.paymemtMode
    if (deliveryMethod?.bankRequired ?? "false").lowercased() == "true" {
      currencies = requestModel?.bank?.payCurrency ?? []
      
    } else {
      currencies = deliveryMethod?.payCurrency ?? []
    }
    
    couponBackgroundView.isHidden = true
    couponBackgroundView.alpha = 0
    couponDropDownImageView.image = dropDownImage
    couponDropDownImageView.tintColor = .themeBlue
  }
  
  private func calculate(
    senderAmt: String?,
    senderCurrency: String? = "KRW",
    recieverAmt: String?,
    recieverCurrency: String?,
    recieverCountryName: String?,
    recieverCountryId: String?,
    paymentMethod: String?,
    paymentMethodId: String?,
    calcBy: String?,
    senderCountryId: String? = "118",
    payoutPartner: String?,
    userId: String?,
    bankId: String?
  ) {
    presenter?.calculate(
      senderAmt: senderAmt,
      senderCurrency: senderCurrency,
      recieverAmt: recieverAmt,
      recieverCurrency: recieverCurrency,
      recieverCountryName: recieverCountryName,
      recieverCountryId: recieverCountryId,
      paymentMethod: paymentMethod,
      paymentMethodId: paymentMethodId,
      calcBy: calcBy,
      senderCountryId: senderCountryId,
      payoutPartner: payoutPartner,
      userId: userId,
      bankId: bankId
    )
  }
  
  @objc private func textChanged(sender: UITextField) {
    action = .calculate
    sendingAmountChanged()
    switch sender {
    case senderTextField:
      reciepientTextField.text = ""
      calcBy = "c"
      senderTextField.text = Utility.getCommaSeperatedString(numberString: senderTextField.text!)
      resetCouponandAppliedMoney()
      
    case reciepientTextField:
      senderTextField.text = ""
      calcBy = "p"
      reciepientTextField.text = Utility.getCommaSeperatedString(numberString: reciepientTextField.text!)
      resetCouponandAppliedMoney()
    default:
      break
    }
  }
  
  private func resetCouponandAppliedMoney() {
    netServiceFee = nil
    
    couponNameLabel.text = "\(couponInfo?.count ?? 0)"
    couponNameTitleLabel.text = "coupon_text".localized()
    realSenderView.isHidden = true
  }
  
  private func sendingAmountChanged() {
    selectCoupon = nil
    
    couponNameLabel.font = .sanfrancisco(.medium, size: 13)
    if couponNameLabel.text  == "\(couponInfo?.count ?? 0)" {    //selectCoupon?.couponType == "1" {
      couponNameTitleLabel.text = "coupon_text".localized()
    }
    realSenderTitleLabel.text = "applied_amount_text".localized()
    
  }
  private func calculate() {
    let senderAmount = senderTextField.text!
    let reciepientAmount = reciepientTextField.text!
    calculateExchangeRate(senderAmount: senderAmount, reciepientAmount: reciepientAmount, calcBy: calcBy)
  }
  
  private func goToVerification() {
    exchangeRateModel?.calcBy = calcBy
    exchangeRateModel?.reciepientCurrency = selectedCurrencyViewModel?.currency ?? ""
    exchangeRateModel?.autodebitSendingAmount = getPlainNumbers(number: senderTextField.text!)
    
    checkIfCouponIsApplied()
    
    actionDelegate?.calculated(model: exchangeRateModel)
    actionDelegate?.continueToVerificationAction()
  }
  
  private func checkIfCouponIsApplied() {
    
    guard let serviceFee = netServiceFee else {
      exchangeRateModel?.discountedServiceFee = exchangeRateModel?.transferFee
      exchangeRateModel?.schemeId = nil
      return
    }
    
    exchangeRateModel?.discountedServiceFee = "\(serviceFee).00"
    exchangeRateModel?.schemeId = couponSchemeId
    
  }
  
  private func getPlainNumbers(number: String) -> String {
    return number.stringRemovingComma()
  }
  
  private func calculateExchangeRate(senderAmount: String, reciepientAmount: String, calcBy: String) {
    let senderAmount = senderAmount.stringRemovingComma() // send sAmt amount
    let reciepientAmount =  reciepientAmount.stringRemovingComma()
    let recipientCurrency = selectedCurrencyViewModel?.currency
    let reciepientCountryId = reciepient?.countryID
    let paymentMethod = requestModel?.autoDebitAccount?.type ?? ""
    let paymentMethodId = requestModel?.paymemtMode?.id
    let payoutPartner = requestModel?.paymemtMode?.payoutPartner
    let myUsername = Utility.getMyUserName()
    let bankId = requestModel?.bank?.id //bank id if selected bank
    let reciepientCountryName = reciepient?.country
    
    calculate(
      senderAmt: senderAmount,
      recieverAmt: reciepientAmount,
      recieverCurrency: recipientCurrency,
      recieverCountryName: reciepientCountryName,
      recieverCountryId: reciepientCountryId,
      paymentMethod: paymentMethod,
      paymentMethodId: paymentMethodId,
      calcBy: calcBy,
      payoutPartner: payoutPartner,
      userId: myUsername,
      bankId: bankId
    )
  }
}

// MARK: SendMoneyExchangeRateViewInterface
extension SendMoneyExchangeRateViewController: SendMoneyExchangeRateViewInterface {
  
  func show(model: SendMoneyExchangeRateModel) {
    exchangeRateModel = model
  }
  
  func show(error: String) {
    showExchangeRateInfomation(isHidden: true)
    alert(type: .error, message: error)
  }
  
  func showLoading() {
    hudDelegate?.showLoading()
  }
  
  func hideLoading() {
    hudDelegate?.hideLoading()
  }
  
  func setCouponModel(with model: [CouponBoxModel]?) {
    
    let filterCoupon = model?.filter({ (coupon) -> Bool in
      return (coupon.couponType?.contains("1") ?? false)
    })
    
    //      couponInfo = model
    couponInfo = filterCoupon
  }
  
  func setError(with error: Error) {
    alert(message: error.localizedDescription)
  }
}

extension SendMoneyExchangeRateViewController {
  override func didMove(toParent parent: UIViewController?) {
    self.viewWillAppear(true)
    if senderTextField.text != "" || reciepientTextField.text != "" {
      calculate()
    }
  }
}

// MARK: - SelectCouponViewDelegate
extension SendMoneyExchangeRateViewController: SelectCouponViewDelegate {
  func viewController(_ viewController: SelectCouponViewController, didSelect coupon: CouponBoxModel?) {
    selectCoupon = coupon
    
    guard
      let selectedCoupon = coupon,
      //      selectedCoupon.couponType == "1",
      let schemeId = selectedCoupon.schemeId,
      schemeId != "",
      let discountType = selectedCoupon.discountType,
      let type = DiscountType(rawValue: discountType),
      var discountValue = Double(selectedCoupon.discountValue ?? ""),
      let senderMoney = Double(senderTextField?.text?.stringRemovingComma() ?? ""),
      let serviceFee = Double(exchangeRateModel?.transferFee?.stringRemovingComma() ?? "")
      else {
        resetCouponandAppliedMoney()
        return
    }
    
    realSenderView.isHidden = false
    couponSchemeId = schemeId
    
    switch type {
    case .percent:
      discountValue = serviceFee * (discountValue / 100)
      couponNameLabel.text = "Service Discount \(selectedCoupon.discountValue ?? "0")%"
      
    case .value:
      couponNameLabel.text = "Service Discount \(selectedCoupon.discountValue ?? "0") KRW"
    }
    
    netServiceFee = "\(serviceFee - discountValue)".likeCommaMoney()
    realSenderLabel.text = "\(senderMoney - discountValue)".likeCommaMoney()
  }
}

// MARK: - UITextFieldDelegate
extension SendMoneyExchangeRateViewController: UITextFieldDelegate {
  func textFieldDidEndEditing(_ textField: UITextField) {
    switch textField {
    case senderTextField, reciepientTextField:
      if senderTextField.text != "" || reciepientTextField.text != "" {
        calculate()
      }
    default:
      break
    }
  }
}

// MARK: - TablePresenterDelegate
extension SendMoneyExchangeRateViewController: 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?
  ) {
    selectedCurrencyViewModel =
      (model as? SendMoneyExchangeRateCurrencyViewModel) ?? selectedCurrencyViewModel
    
    calcBy.lowercased() == "c" ? (reciepientTextField.text = "") : (senderTextField.text = "")
  }
}