//
//  BiometricAuthenticationWireframe.swift
//  GME Remit
//
//  Created by InKwon Kim on 30/03/2019.
//Copyright © 2019 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import LocalAuthentication

class BiometricAuthenticationWireframe {
  weak var view: UIViewController!
  private var policy: LAPolicy = .deviceOwnerAuthenticationWithBiometrics
  private weak var delegate: BiometricAuthenticationViewControllerDelegate?
}

extension BiometricAuthenticationWireframe: BiometricAuthenticationWireframeInput {
  var storyboardName: String {return "BiometricAuthentication"}
  
  func getMainView() -> UIViewController {
    let service = BiometricAuthenticationService()
    let interactor = BiometricAuthenticationInteractor(service: service)
    let presenter = BiometricAuthenticationPresenter()
    let viewController = viewControllerFromStoryboard(of: BiometricAuthenticationViewController.self)
    
    viewController.presenter = presenter
    interactor.output = presenter
    presenter.interactor = interactor
    presenter.wireframe = self
    presenter.view = viewController
    
    self.view = viewController
    return viewController
  }
  
  func showBiometricAuthentication(completion: ((BiometricAuthenticationError?) -> Void)?) {
    let context = LAContext()
    
    var error: NSError?
    let msg = "bio_message_title_text".localized()
    
    let vc = self.view as? BiometricAuthenticationViewController ?? BiometricAuthenticationViewController()
    
    if let bioPolicy = delegate?.doSelectLocalAuthenticationPolicy(vc) {
      switch bioPolicy {
      case .deviceOwnerAuthentication:
        self.policy =  .deviceOwnerAuthentication
      case .deviceOwnerAuthenticationWithBiometrics:
        self.policy = .deviceOwnerAuthenticationWithBiometrics
      }
    }
    
    if context.canEvaluatePolicy(self.policy, error: &error) {
      context.evaluatePolicy(self.policy, localizedReason: msg, reply: { (success, err) in
        if success {
          DispatchQueue.main.async {
            completion?(nil)
            self.delegate?.didComplete(vc)
          }
        } else {
          DispatchQueue.main.async {
            let bioError = self.setBiometricError(error: err)
            completion?(bioError)
            self.delegate?.viewController(vc, didFailWithError: bioError, errorMessage: bioError.message)
          }
        }
      })
    } else {
      KeyChain.shared.save(data: "0", key: .biometricAuth)
      
      DispatchQueue.main.async {
        let bioError = self.setBiometricError(error: error)
        completion?(bioError)
        self.delegate?.viewController(
          vc,
          didFailWithError: bioError,
          errorMessage: bioError.localizedDescription
        )
      }
    }
  }
  
  func openWithDelegate(
    on window: UIWindow,
    delegate: BiometricAuthenticationViewControllerDelegate
  ) {
    let vc = getMainView()
    self.delegate = delegate
    (vc as? BiometricAuthenticationViewController)?.delegate = delegate
    
    window.rootViewController = vc
  }
  
  func openWithDelegate(
    on viewConroller: UIViewController,
    delegate: BiometricAuthenticationViewControllerDelegate
  ) {
    let vc = getMainView()
    self.delegate = delegate
    (vc as? BiometricAuthenticationViewController)?.delegate = delegate
    
    viewConroller.present(vc, animated: true, completion: nil)
  }
}

extension BiometricAuthenticationWireframe {
  private func setBiometricError(error: Error?) -> BiometricAuthenticationError {
    let bioError: BiometricAuthenticationError
    
    if #available(iOS 11.0, *) {
      switch error {
      case LAError.authenticationFailed?:
        bioError = .authenticationFailed
      case LAError.userCancel?:
        bioError = .userCancel
      case LAError.userFallback?:
        bioError = .userFallback
      case LAError.biometryNotAvailable?:
        bioError = .biometryNotAvailable
      case LAError.biometryNotEnrolled?:
        bioError = .biometryNotEnrolled
      case LAError.biometryLockout?:
        bioError = .biometryLockout
      default:
        bioError = .notBeConfigured
      }
    } else {
      switch error {
      case LAError.authenticationFailed?:
        bioError = .authenticationFailed
      case LAError.userCancel?:
        bioError = .userCancel
      case LAError.userFallback?:
        bioError = .userFallback
      case LAError.touchIDNotAvailable?:
        bioError = .biometryNotAvailable
      case LAError.touchIDNotEnrolled?:
        bioError = .biometryNotEnrolled
      case LAError.touchIDLockout?:
        bioError = .biometryLockout
      default:
        bioError = .notBeConfigured
      }
      
    }
    
    return bioError
  }
}