LONDON-IOS/GME Remit/Utilities/SecureKeypad.swift

//
//  SecureKeypad.swift
//  GME Remit
//
//  Created by InKwon Kim on 17/04/2019.
//  Copyright © 2019 Gobal Money Express Co. Ltd. All rights reserved.
//

import Foundation

protocol SecureKeypadDelegate: class {
  func didComplete(_ encryptedString: String, garbagePassword: String, length: Int)
}

enum SecureKeypadType {
  case ascii
  case numberic
}

class SecureKeypad: NSObject {
  
  weak var delegate: SecureKeypadDelegate?
  
  var title = "Enter Your GME Password" {
    didSet {
      self.updateUI()
    }
  }
  var placeholder = "Enter Your GME Password" {
    didSet {
      self.updateUI()
    }
  }
  
  var placeholderFont: UIFont? = .sanfrancisco(.regular, size: 15) {
    didSet {
      self.updateUI()
    }
  }
  
  private lazy var asciiKeypad = TransKeyView()
  private lazy var numberPad = TransKeyView()
  
  private var target: UIViewController!
  private var keypadType: SecureKeypadType = .ascii
  
  private var encryptedString = ""
  private var decryptedLength = 0
  
  init(target: UIViewController, keypadType: SecureKeypadType = .ascii) {
    super.init()
    
    self.target = target
    self.keypadType = keypadType
    self.initKeypad()
    
  }
  
  deinit {
    self.asciiKeypad.mTK_ClearDelegateSubviews()
    self.numberPad.mTK_ClearDelegateSubviews()
    self.asciiKeypad.delegate = nil
    self.numberPad.delegate = nil
  }
  
  func present(animated: Bool, completion: (() -> Void)? = nil) {
    let vc: TransKeyView
    
    switch keypadType {
    case .ascii:
      vc = self.asciiKeypad
    case .numberic:
      vc = self.numberPad
    }
    
    vc.modalPresentationStyle = .fullScreen
    self.target.present(vc, animated: true, completion: completion)
  }
  
  private func updateUI() {
    switch self.keypadType {
    case .ascii:
      self.updateASCIIUI()
    case .numberic:
      self.updateNumber()
    }
  }
  
  private func initKeypad() {
    switch self.keypadType {
    case .ascii:
      self.initASCIIKeypad()
      self.updateASCIIUI()
    case.numberic:
      self.initNumberKeypad()
      self.updateNumber()
    }
  }
  
  /// init ASCII keypad
  private func initASCIIKeypad() {
    asciiKeypad.mTK_Init(self)
    asciiKeypad.delegate = self
    asciiKeypad.mTK_MakeSecureKey()
    asciiKeypad.mTK_ShowMessageIfMaxLength("16자리 입력이 초과되었습니다.")
    asciiKeypad.mTK_UseCursor(true)
    asciiKeypad.mTK_UseAllDeleteButton(true)
    asciiKeypad.mTK_UseNavigationBar(true)
    asciiKeypad.mTK_UseVoiceOver(true)
    asciiKeypad.mTK_setHideInputPasswordDelay(3)
    asciiKeypad.mTK_SetControlCenter(false)
    asciiKeypad.mTK_setIgnoreStatusbar(false)
    asciiKeypad.mTK_UseShiftOptional(true)
    asciiKeypad.mTK_Supported(byDeviceOrientation: SupportedByDevicePortraitAndLandscape)
    asciiKeypad.mTK_EnableSamekeyInputDataEncrypt(true)
    asciiKeypad.mTK_SetUseBalloonImageButton(true)
    asciiKeypad.mTK_LicenseCheck("license_mtranskey")
  }
  
  /// update ASCII UI
  private func updateASCIIUI() {
    asciiKeypad.mTK_SetHint(self.placeholder, font: self.placeholderFont)
    asciiKeypad.setKeyboardType(
      self,
      keypadType: 0,
      mTK_inputType: 2,
      mTK_inputTitle: self.title,
      mTK_cryptType: 0,
      mTK_maxLength: 100,
      mTK_minLength: 0,
      mTK_keypadUpper: false,
      mTK_languageType: 1
    )
  }
  
  private func initNumberKeypad() {
    numberPad.mTK_Init(self)
    numberPad.delegate = self
    numberPad.mTK_MakeSecureKey()
    numberPad.mTK_LicenseCheck("license_mtranskey")
    numberPad.mTK_ShowMessageIfMinLength("0자리 이상 입력해주세요.")
    numberPad.mTK_ShowMessageIfMaxLength("16자리 입력이 초과되었습니다.")
    numberPad.mTK_UseVoiceOver(false)
    numberPad.mTK_setIgnoreStatusbar(false)
    numberPad.mTK_SetControlCenter(false)
    numberPad.mTK_UseAllDeleteButton(false)
    numberPad.mTK_Supported(byDeviceOrientation: SupportedByDevicePortraitAndLandscape)
  }
  
  private func updateNumber() {
    numberPad.mTK_SetHint(self.placeholder, font: self.placeholderFont)
    numberPad.setKeyboardType(
      self,
      keypadType: TransKeyKeypadTypeText,
      mTK_inputType: 2,
      mTK_inputTitle: self.title,
      mTK_cryptType: 0,
      mTK_maxLength: 16,
      mTK_minLength: 0,
      mTK_keypadUpper: false,
      mTK_languageType: Int(mTK_Language_English.rawValue)
    )
  }
}

extension SecureKeypad: TransKeyViewDelegate {
  func secureInputFinish(_ type: Int) {
    
    let vc: TransKeyView
    
    switch keypadType {
    case .ascii:
      vc = self.asciiKeypad
    case .numberic:
      vc = self.numberPad
    }
    
    self.encryptedString = vc.mTK_GetSecureData()
    
    self.decryptedLength = vc.mTK_GetDataLength()
    
    if self.decryptedLength == 0 {
      self.encryptedString = ""
    }
    
    vc.dismiss(animated: true) {
      var garbagePW = ""
      for _ in 0..<self.decryptedLength {
        garbagePW += "●"
      }
      
      self.delegate?.didComplete(
        self.encryptedString,
        garbagePassword: garbagePW,
        length: self.decryptedLength
      )
    }
  }
}