SignError.swift

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
    case safariAuthentification
    case facebookAuth
    case unauthorized

    var localizedMessage: String {
      switch self {
      case .unknown:                return L10n.commonErrorSigninUnknownMessage
      case .invalidCredentials:     return L10n.commonErrorSigninInvalidCredentialsMessage
      case .mailEmpty:              return L10n.errorSignMailEmpty
      case .mailIncorrect:          return L10n.errorSignMailIncorrect
      case .passwordIncorrect:      return L10n.errorSignPasswordIncorrect
      case .serviceInconsistency:   return L10n.errorSignInconsistency
      case .safariAuthentification: return L10n.errorSignSignInFacebookSafari
      case .facebookAuth:           return L10n.errorSignSignInFacebook
      case .unauthorized:           return L10n.errorUnauthorized
      }
    }

    var underlying: Swift.Error? {
      switch self {
      case .unknown(let underlying), .invalidCredentials(let underlying):
        return underlying
      default:
        return nil
      }
    }
  }
}