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import Foundation
import SwiftyBeaver

// direct access to the logger across the app
let logger = SwiftyBeaver.self

extension SwiftyBeaver {
  static func setupConsole() {
    let console = ConsoleDestination()
    console.levelColor.verbose = "⚪️ "

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final class HomeViewController: ViewController {

  // Perhaps a UICollectionView here

  // Data structures
  fileprivate let dataFetcher = HomeDataFetcher()
  
  override func viewDidLoad() {
    super.viewDidLoad()
    

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// MARK: - Reloadable
extension HomeViewController: Reloadable {

  var hasData: Bool {
    return !self.dataFetcher.data.isEmpty
  }

  func reloadData() {
    self.progressView?.hide()
    // Simple factory which choose and init a ProgressView subclass according to a type, here "home"

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// MARK: - Failable
extension HomeViewController: Failable {
  var errorScreenType: ErrorScreen? {
    return .home
  }

  var errorContext: ErrorContext {
    return .dataOriented
  }
}

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class ViewController: UIViewController {

  var errorView: ErrorView?
  var progressView: ProgressView?
}

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// MARK: - ViewController Default implementation
extension Failable where Self: ViewController {

  func showError<T: ErrorDisplayable>(_ error: Swift.Error?, errorView: T.Type, _ reloadable: Reloadable) {
    self.errorView = errorView.show(fromView: self.view, insets: .zero, animated: true, completion: nil)

    if var errorViewRetryable = self.errorView as? ErrorRetryable {
      errorViewRetryable.retry = { reloadable.reloadData() }
      errorViewRetryable.message = error?.localizedMessage
    }

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// MARK: - UIViewController Default implementation
extension FailableCore where Self: UIViewController {

  func showError(_ error: Swift.Error?) {

    let errorMessage = error?.localizedMessage ?? L10n.commonErrorMessage

    SwiftMessages.showAlert(title: errorMessage)

  }

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struct SignIn {

  enum Error: Swift.Error, Localizable, Underlying {

    case unknown(underlying: Swift.Error?)
    case invalidCredentials(underlying: Swift.Error?)
    case mailEmpty
    case mailIncorrect
    case passwordIncorrect
    case serviceInconsistency

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extension Error {

  var localizedMessage: String {
    if let error = self as? SignIn.Error { return error.underlying?.localizedMessage ?? error.localizedMessage }
    if let error = self as? Network.Error { return error.localizedMessage }
    if let error = self as? Store.Error { return error.localizedMessage }
    return L10n.commonErrorMessage // Fallback error message
  }

  var underlying: Swift.Error? {

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protocol Localizable {
  var localizedMessage: String { get }
}

protocol Underlying {
  var underlying: Swift.Error? { get }
}